CN101012748A - Wellface scanning imagery logging device with microresistivity - Google Patents
Wellface scanning imagery logging device with microresistivity Download PDFInfo
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Abstract
The invention relates to a formation microresistivity image well logging, which is an important borehole image logging instrument. The covering area of formation microresistivity image well logging instrument to the borehole can achieve 60% or so. It makes use of 150 button small electrodes in two rows on six electrode plates to emit current to the sidewall formation and then current signal emitted by each electrode is collected. Because the component, the structure and contained fluid of rock contacted with the electrode are different, generated current changes and the current change reflects the change of rock resistivity at every place of borehole. After high density sampling and high-resolution imaging treatment are carried out, the borehole image of resistivity can be displayed. The vertical resolution can achieve several millimeter. The imaging graph has intuitive visual function. Based on the borehole imaging graph, the distributing characteristic, the type of crack, the bedding of stratum, the valid thickness of reservoir and so on are analyzed correctly.
Description
One. technical field: the present invention relates to a kind of by measuring borehole wall stratum media resistivity, the imaging logging instrument of acquisition down-hole lithology and borehole wall geometry.
Two. background technology: along with the quickening of oil-gas exploration process and the raising of degree of prospecting, the exploration object is increasingly sophisticated and hidden, and difficulties in exploration is increasing, and conventional logging is in reservoir description, find that aspect such as oil-gas Layer can not satisfy the requirement of reservoir description fast.
China's oil reserves nearly 90% are main sandstone oil reservoir from continental deposit, and the gas reserves major part is from non-sandstone reservoirs, and geological conditions is very complicated.The oil field total size is little, and reservoir conditions is poor, and type is many, the lithology complexity, and reservoir heterogeneity is serious, and rerum natura changes greatly, thin layer, thin interbed and low porosity and low permeability reservoir ubiquity.Its effective thickness of sand shale thin interbed is usually less than 0.5 meter.In the Oilfield developing process, it is significant to improving recovery ratio effectively to discern thin layer.The conventional logging method exists difficulty in effective division of sand shale thin interbed.A large amount of carbonate nonuniformitys stratum for Paleozoic group, the growth of following Paleozoic group; The fracture-type reservoir that all kinds of hard formations form; All kinds of igneous rock, granite gneiss, mud stone, the glued hard sand of low porosity and low permeability grey matter etc., carrying out crack network analysis and reservoir characteristic analysis is a great problem that the conventional logging technology is faced.Complex reservoir often refers to the glutenite heterogeneous reservoir of rapid accumulation, and all kinds of igneous rock homogeneous formations that form in the sedimentary basin.Glutenite formation rock complex structure, reservoir heterogeneity are strong, judge that with the conventional logging data oiliness of glutenite reservoir is another difficult problem during interpretation of logging data is estimated.
At present, conventional microresistivity log method mainly contains nutural potential logging method, laterolog method, induction well logging method, electrode system logging method etc.Nutural potential logging and electrode system data volume are few, and resolution ratio is low.And laterolog method and induction well logging method, what it was measured is the whole corresponding effect on a ring-type stratum, resolution ratio is low.Dipmeter log also can be measured bottom resistivity, but its coverage scale to the stratum is low, and it is few to measure the data volume that obtains, and dipmeter tool has only 4 electrodes.When local slabbing seam development degree was relatively poor, the chance in the electrode contact crack of stratigraphic dip just was significantly less than imaging logging.Have only when the electrode at inclination angle touches the crack, just have shown.Therefore contrast can only be carried out in the well section of fracture development.Conventional logging method data volume is little as can be seen, resolution ratio is low, little to borehole wall coverage rate, be difficult to occurrence, the distribution density of crack identification accurately and efficiently, can't distinguish crack, little solution cavity and dissolution pore.In order to obtain system and data accurately in the oil and natural gas prospect pit, removal of core is reliable means, but every mouthful of well can not full coring, and during coring, also have any problem and error in the location of rock core.
Three. summary of the invention: the present invention seeks at existing microresistivity device and the existing problem of other conventional logging technology, development trend in conjunction with domestic and international microresistivity device provides a kind of wellface scanning imagery logging device with microresistivity that can carry out lithology identification, crack identification, stratigraphic structure analysis etc.
Stratum microresistivity scanning borehole wall imaging logging is a kind of important borehole wall imaging logging instrument, wellface scanning imagery logging device with microresistivity can reach about 60% (8 inches wells) the area coverage of well, it utilize two on six pole plates rows totally 150 small electrodes buttony then the current signal that each electrode sent is gathered to borehole wall stratum emission current.Because the difference of rock composition, structure and the contained fluid of electrode contact, cause the variation of electric current thus, the variation of the variation of electric current reflection borehole wall rock resistivity is everywhere carried out can showing the borehole wall imaging of resistivity after high-density sampling and high-resolution imaging handle.Its longitudinal frame can reach several millimeters.Image has visual performance intuitively, can make correct analysis to the division of the bedding on the distribution characteristics in crack, type, stratum, sand mud thin interbed, reservoir effective thickness, the variation of deposition grain preface, the size of gravel particle etc. from the borehole wall image.
Microresistivity scanning logging technique is compared with conventional numerical control logging technique, is the once leap on the logging technique.It reflects the composition and the structure of borehole wall rock stratum with scan image, and can obtain the occurrence in rock stratum and crack etc., has overcome above deficiency.The well logging of microresistivity scanning imagery can be to pit shaft directly perceived, clear, the high-resolution ground imaging of stratum media on every side, help to solve three the earth that current logging technique faces and blame topic, it is effective division of sand shale thin interbed reservoir, the crack of fractured reservoir and reservoir characteristic analysis, the parameter evaluation of complex reservoir.It simultaneously also is the main foundation of core orientation playback.
Its technical scheme is to comprise electronic circuit and telescoping ram two parts, electronic circuit comprises the amplifying circuit that transmits, measuring circuit transmits, motor control circuit, signal and reference signal circuit transmit, the double polarity plate drive circuit, the bipolar plates receiving circuit, the orientation signal multiplexing circuit, the hole diameter signal circuit, data acquisition and control circuit, instrument main control and interface circuit, remote unit circuit and orientation sensor connect to form, motor control circuit control telescoping ram is opened leg, receive leg, telescoping ram comprises pressure balancing system, the platen potentiometer, the hole diameter potentiometer, the backup arm actuating mechanism, the hole diameter backup arm, the pole plate device, the hole diameter backup arm pushes away the receipts motor and connects to form, it is characterized in that: the amplifying circuit that transmits drives the bucking electrode group to amplifying from the sinusoidal drive signals that transmits with reference signal circuit; The measuring circuit that transmits mainly to the temperature of the voltage that transmits, electronic circuit, interior quarter signal and platen potentiometer voltage measure; Transmit and reference signal circuit provides the stratum to drive signal, produce the internal calibration signal, also provide the phase-sensitive detection reference signal and the signal at interior quarter of be used to transmit measuring circuit and bipolar plates receiving circuit; The double polarity plate drive circuit is used as the interface circuit between data acquisition and control circuit and the preceding discharge of the pole plate road, and the double polarity plate drive circuit comprises the consistent circuit of two covers, and every suit circuit is all connecting the preceding road of discharging of three pole plates; The bipolar plates receiving circuit is carried out the phasor measurement of button electrode current signal, it is made up of the identical circuit of two covers, every cover circuit all includes input amplifications/phase separation circuit, a phase sensitive detection circuit and a difference is imported low-pass filter circuit, has three bipolar circuit board for receiving and six imaging pole plates link together; The orientation signal multiplexing circuit mainly is that seven road direct current signals from the orientation sensor are carried out multiplexed transmission, plays the effect of filter network simultaneously; The hole diameter signal circuit is used to measure the extension of backup arm, produces the positive and negative reference voltage of the gain ranging that is used for calibration data collection and control circuit simultaneously, and the output signal of hole diameter signal circuit is gathered and controlled by data acquisition and control circuit; Data acquisition comprises two identical circuit boards with control circuit, each piece circuit board all comprises a data processor, field programmable gate array, A/D analog-digital converter, programmable gain amplifier and sampling hold circuit, generation is used for the required time base of data acquisition, produce the control signal that is used for the multiplex electronics on imaging pole plate and the subsidiary plate simultaneously, the analog signal that collects is carried out digitlization, pack then and give instrument control and interface circuit; Instrument main control and interface circuit mainly comprise a digital signal processor and a field programmable gate array, it mainly is the order of response from the remote unit circuit, for other circuit provides order and control, be the interface circuit between remote unit circuit and other electronic circuit; The remote unit circuit is responsible for receiving various command and transmitting digitized telemetered signal, and the bottom of telescoping ram is provided with 6 independently backup arms, and pole plate all is installed on each backup arm, and two row's small electrodes are installed above every pole plate.
150 small electrodes are housed on 6 pole plates altogether, the row of going up of odd number pole plate is 12 small electrodes, following row has 13 small electrodes, the row of going up of even number pole plate is 13 small electrodes, following row has 12 small electrodes, small electrode on each pole plate is connected with corresponding pole plate pre-amplification circuit by plug connector and connecting line, and the pole plate pre-amplification circuit includes a bifurcation high-gain amplifier, a high-speed buffer and a multiplexer, is used to select, amplify the current signal from small electrode.
The orientation sensor is the sensor of a bottled solid state, sensor comprises three magnetometers, three accelerometers and a temperature pick up, the rotation that is used to calculate azimuth, hole azimuth angle and the instrument of No. 1 pole plate from the data of magnetometer, from the drift angle that the data of accelerometer are used to calculate well, temperature pick up is used to monitor the temperature of orientation sensor internal.
With independent movable backup arm pole plate is pushed against on the borehole wall only by six, making the small electrode double buttony on telescoping ram lower case and the pole plate launch the electric current of same polarity to borehole wall stratum under the control of electronic circuit, the upper metal housing of instrument is as loop electrode, keep the current potential of pole plate constant, the electric current of telescoping ram lower case emission plays the shielding focussing force to the electric current of small electrode emission.Because the rock composition of small electrode contact, the difference of structure and contained fluid, cause the variation of electric current thus, the variation of the variation reflection borehole wall rock resistivity everywhere of electric current, note the raw information of the resistivity that each electrode measurement arrives, data are handled through a series of corrections, as depth correction, velocity correction and balance correction etc. are handled the back and are formed resistivity image, promptly get colour table or gray value scale with a kind of gradual change, each sampled point of each electrode is become a look unit, and the slight change of color can provide near the lithology the borehole wall, rerum natura, bedding, geological informations such as solution cavity are closed in the crack.Obtain the resistivity logging image at last.
In the Oilfield developing process, it is significant to improving recovery ratio effectively to discern thin layer.Wellface scanning imagery logging device with microresistivity can provide and exceed 30 to 40 times longitudinal frame than conventional logging.It can identify the thin layer of 5mm.
Utilize microresistivity scanning logging method to discern the crack of limestone formation, solution cavity etc. effectively, for the meticulous division of oil, gas, water layer provides the important parameters foundation, the well logging of microresistivity scanning imagery can be to pit shaft directly perceived, clear, the high-resolution ground imaging of stratum media on every side, help to solve three the earth that current logging technique faces and blame topic: effective division of sand shale thin interbed reservoir, the crack of fractured reservoir and the performance evaluation of collection collection, the parameter evaluation of complex reservoir.Can be applied to crack identification and evaluation, carry out the evaluation of high-resolution thin layer, the stratum SEDIMENTARY ENVIRONMENT, inner structure analysis layer by layer and geologic structure interpretation and help the core location and describe.
Compare conventional microresistivity scanning well logging following advantage just arranged:
1, having high vertical resolution (5mm), is 30 to 40 times of conventional logging resolution ratio.
2, image has visual performance intuitively, can make correct analysis to the division of the bedding on the distribution characteristics in crack, type, stratum, sand mud thin interbed, reservoir effective thickness, the variation of deposition grain preface, the size of gravel particle etc. from the borehole wall image.
3, have former stratigraphic dip all functions, the stratigraphic dip polar plot can be provided, determine attitude of stratum, tomography orientation and trend.
4, under certain conditions, can substitute drilling and coring delivery target zone is carried out core description, and have admission data time weak point, the characteristics that expense is low, but can not substitute actual rock core fully.
5, can provide vector result of calculation, as number degree of porosity such as the opening degree in crack, direction, trends etc. to the crack.
6, imaging logging can provide complete formation lithology section, and measurement result has directionality.
7, imaging logging makes the crack research work become directly perceived more and deepens.
8, imaging logging makes that to utilize that well-log information is constructed, the sedimentary facies research work becomes easier and effective.
Four. description of drawings:
Accompanying drawing 1 wellface scanning imagery logging device with microresistivity structural representation sketch
2 one groups of adjacent imaging pole plate plane structure schematic diagrames of accompanying drawing
Accompanying drawing 3 telescoping ram structural representations
The circuit function structured flowchart of accompanying drawing 4 electronic circuits part
Accompanying drawing 5 pole plate pre-amplification circuit module frame charts
Five. the specific embodiment:
Structure of the present invention is formed and is mainly comprised electronic circuit and telescoping ram two parts.Electronic circuit is made up of top electronic circuit, orientation sensor and bottom electronic circuit.The bottom electronic circuit is connected by 48 pin connectors below the electronic circuit of top, and the orientation sensor is connected on the electronic circuit of bottom by 25 pin connectors.The top electronic circuit mainly comprises the amplifying circuit that transmits, the measuring circuit that transmits and motor control circuit.The bottom electronic circuit mainly comprises and transmitting and reference signal circuit, double polarity plate drive circuit, bipolar plates receiving circuit, orientation signal multiplexing circuit, hole diameter signal circuit, data acquisition and control circuit, instrument main control and interface circuit, remote unit circuit.
The described amplifying circuit that transmits drives bucking electrode group (telescoping ram housing and pole plate) to amplifying from the sinusoidal drive signals that transmits with reference signal circuit.Described transmit measuring circuit mainly to the temperature of the phasor voltage that transmits, electronic circuit, interior quarter signal and platen potentiometer voltage measure.Described motor control circuit is responsible for telescoping ram and is opened leg, receives leg.Described transmit and reference signal circuit provides the stratum to drive signal produces the internal calibration signal, also provides the phase-sensitive detection reference signal and the signal at interior quarter of be used to transmit measuring circuit and bipolar plates receiving circuit.Described double polarity plate drive circuit is used as the interface circuit between data acquisition and control circuit and the preceding discharge of the pole plate road, and the double polarity plate drive circuit comprises the consistent circuit of two covers, and every suit circuit is all connecting the preceding road of discharging of three pole plates.Described bipolar plates receiving circuit is carried out the phasor measurement of button electrode current signal, and it is made up of the identical circuit of two covers, and every cover circuit all includes an input amplification/phase separation circuit, phase sensitive detection circuit and difference input low-pass filter circuit.Have three bipolar circuit board for receiving and six imaging pole plates link together.Described orientation signal multiplexing circuit mainly is that seven road direct current signals from the orientation sensor are carried out multiplexed transmission, plays the effect of filter network simultaneously.Described hole diameter signal circuit is used to measure the extension of backup arm, produces the positive and negative reference voltage of the gain ranging that is used for calibration data collection and control circuit simultaneously.The output signal of hole diameter signal circuit is gathered and is controlled by data acquisition and control circuit.Described data acquisition comprises two identical circuit boards with control circuit, and each piece circuit board all comprises a data processor (DSP), field programmable gate array (FPGA), A/D analog-digital converter, programmable gain amplifier and sampling hold circuit.Base when generation is used for 8.33 milliseconds of per 0.1 inch data acquisition produces the control signal that is used for the multiplex electronics on imaging pole plate and the subsidiary plate simultaneously.The analog signal that collects is carried out digitlization, pack then and give instrument control desire interface circuit.Described instrument main control and interface circuit mainly comprise a digital signal processor (DSP) and a field programmable gate array (FPGA).It mainly be response from the order of remote unit circuit for other circuit provides order and control, be the interface circuit between remote unit circuit and other electronic circuits.Described remote unit circuit is responsible for receiving various command and transmitting digitized telemetered signal.Described orientation sensor is the sensor of a bottled solid state, is used for the inclination and the rotation of monitoring instrument.Sensor comprises three magnetometers, three accelerometers and a temperature pick up.The rotation that is used to calculate azimuth, hole azimuth angle and the instrument of No. 1 pole plate from the data of magnetometer.The drift angle that is used to calculate well from the data of accelerometer.Temperature pick up is used to monitor the temperature of orientation sensor internal.
Described pressure balancing system mainly is to realize when backup arm is flexible the inside and outside pressure reduction of instrument being compensated.Mainly form by pressure relieving valve, pressure compensated piston and pressure balance medium.Described platen potentiometer provides a voltage measurement, and this voltage measurement is used to monitor the pressure that is applied in the backup arm bindiny mechanism when backup arm is flexible.Described hole diameter potentiometer is equipped with six altogether, is used to provide voltage measurement, and this voltage is used for measuring the radial location of each backup arm from the telescoping ram central axis.Described backup arm actuating mechanism is that the hole diameter backup arm pushes away the coupling part of receiving between motor and the backup arm, is responsible for the interlock effect.Mainly comprise leading screw, platen, the recovery axle collar, torque limiter, unidirectional torque bearing and ball nut composition.Described hole diameter backup arm is connecting imaging pole plate device, is responsible for when well logging pole plate being pushed against on the borehole wall.Be separate flexible between the backup arm.Described pole plate device is equipped with six altogether, and pole plate preceding discharge road and the ceramic button-type small electrode of two rows are installed above.150 small electrodes are housed on 6 pole plates altogether, and the diameter of each small electrode is 0.2 inch, 0.1 inch of small electrode spacing.The row of going up of odd number pole plate is 12 small electrodes, and following row has 13 small electrodes.The row of going up of even number pole plate is 13 small electrodes, and following row has 12 small electrodes.By small electrode to the stratum emission current.The pole plate pre-amplification circuit all is installed on each pole plate, is used to select, amplify current signal from small electrode.Include a bifurcation high-gain amplifier, a high-speed buffer and a multiplexer in the circuit.The pole plate pre-amplification circuit is installed in the air-pressure chamber the inside of imaging pole plate, is connected with button electrode group with the line that is flexible coupling by 25 pin connectors.Described hole diameter backup arm pushes away the receipts motor and is used for the flexible power source of backup arm.Drive the backup arm actuating mechanism by connecting rod, so finish backup arm open, receive action.
The raw information of the resistivity that each electrode measurement arrives is noted in the variation that instrument is measured the resistivity around the borehole wall by the button electrode, and the variation of resistivity is represented with different colours, obtains the resistivity logging image at last.Stratum that it reflects and geologic feature, owing to be scanning imagery, true and meticulous more, it will provide the complete stratum planing surface with directionality, to a certain extent, can replace drilling and coring delivery, can directly discern features such as attitude of stratum, bedding, deposition grain preface, thin interbed, tomography and folds.Simultaneously, it also notes azimuth (AZ), drift azimuth (DAZ) and the hole angle (DEV) etc. of the relative magnetic north of pole plate, then the image that collects is rearranged, the a certain fixing orientation of its instrument is launched, thereby the occurrence such as stratum, tomography and crack that it reflects have the orientation, and this has just overcome the deficiency of numerical control logging technique.
Instrument is equipped with six backup arms and pole plate, just can make more accurate inclination angle with respect to four arm inclination angle instruments of routine like this and calculate.Can calculate simultaneously more detailed borehole geometry and more accurate wellbore volume.When the invaded zone was superficial or moderate, instrument not only may be provided in the picture data, and the quantitative orientation distribution on stratum in the horizontal well can be provided by calculating.
With reference to accompanying drawing 1, wellface scanning imagery logging device with microresistivity mainly is made up of electronic circuit 1 and telescoping ram 2 two parts.Six independently backup arms 4 of activity are installed on the telescoping ram, on each backup arm a pole plate are housed, two row's small electrodes 5 are installed on each pole plate.Electronic circuit 1 has comprised circuit such as control, collection, measurement and transmission.The upper body of telescoping ram 2 is glass-reinforced plastic materials, and bottom and backup arm 4 are metal material, so have only lower case and backup arm 4 emission bucking currents.By six independent movable backup arms 4 pole plate 3 is pushed against on the borehole wall during well logging.
With reference to accompanying drawing 2, pole plate preceding discharge road 6 and the ceramic button-type small electrode 5 of two rows are installed above the pole plate device.Six respectively have 25 ceramic button-type small electrodes 5, guarantee the level of coverage of electrode pair well.The row of going up of odd number pole plate is 12 ceramic button-type small electrodes 5, and following row has 13 ceramic button-type small electrodes 5.The row of going up of even number pole plate is 13 ceramic button-type small electrodes 5, and following row has 12 ceramic button-type small electrodes 5.150 electricity are housed on 6 pole plates altogether buckle (microelectrode), the diameter of each small electrode 5 is 0.2 inch, 0.1 inch of electricity button spacing.Pole plate pre-amplification circuit 6 all is installed on each pole plate, is used to select, amplify current signal from small electrode.Include a bifurcation high-gain amplifier, a high-speed buffer and a multiplexer in the circuit.The pole plate pre-amplification circuit is installed in the air-pressure chamber the inside of imaging pole plate, is connected with button electrode group with the line that is flexible coupling by 25 pin connectors.Pole plate is pushed against on the borehole wall during well logging, and by measuring circuit control emission current in the stratum, each pole plate electricity is buckled the current strength of being launched and changed with the difference of its rock of borehole physical characteristic that reclines.To observe the variation (as crack, hole etc.) of down-hole lithology and borehole wall geometry.
Pole plate is pushed against on the rock of borehole during measurement, and by electronic circuit 1 control telescoping ram 2 lower case and small electrode emission same polarity electric current, the metal shell on the instrument is as loop electrode.The top of telescoping ram is glass fibre reinforced plastics casing, so have only the lower case emission current.Make the current potential of pole plate keep constant, on the pole plate and the electric current of launching on telescoping ram 2 housings electric current of small electrode is played the shielding focussing force, the electric current of focusing arrives loop electrode by the stratum.The current strength that small electrode is launched changes with the difference of its rock of borehole that reclines and borehole wall condition, mainly reflects near the microresistivity on the stratum of the borehole wall.Adopt the trickle change in resistance that sample has just obtained full well section for per 0.1 inch along the borehole wall.This intensive sampled data is handled through a series of corrections, handle the back as depth correction, velocity correction and balance correction etc. and form resistivity image, promptly get colour table or gray value scale with a kind of gradual change, each sampled point of each electrode is become a look unit, and the slight change of color can provide near lithology, rerum natura, bedding, the crack the borehole wall to close geological informations such as solution cavity.
With reference to accompanying drawing 3, six backup arms 10 are installed on the telescoping ram.When reclining the borehole wall, six backup arms can be realized independently actuating by dish spring 11 devices.Because hole anomaly, six backup arms 10 recline the pressure of the borehole wall can not be all consistent, when pressure that a certain backup arm bore acquires a certain degree, 11 compressions of dish spring will be alleviated the pressure that backup arm bore.When backup arm opened, leading screw 12 and ball nut 13 drove platen 14, promote backup arm 10 and outwards uphold.When backup arm 10 shrank, platen 14 utilized and reclaims 10 contractions of the axle collar 15 promotion backup arms.Six hole diameter potentiometers 16 and six platen potentiometers 17 are installed in the telescoping ram.Wherein hole diameter potentiometer 16 is used to provide voltage measurement, and this voltage is used for measuring the radial location of each backup arm 10 from the telescoping ram central axis.Platen potentiometer 17 provides a voltage measurement, and this voltage measurement is used to monitor the pressure that is applied in the backup arm bindiny mechanism when backup arm 10 stretches.Unidirectional torque bearing 18 is responsible for realizing that motor 19 can apply moment of torsion and give leading screw 12, thereby makes backup arm 10 uphold or contraction.Prevent that leading screw 12 from applying moment of torsion and giving motor 19.Torque limiter 20 is a kind of protective devices, and when ball nut 13 arrived leading screws 12 terminals, torque limiter 20 began to work, and prevents the moment of torsion damage instrument that overflows.Pressure balancing system has occupied the major part of telescoping ram structure.By injecting oil, as balance media.The compensating piston 21 that moves freely is realized instrument internal and outside pressure balance.Two pressure relieving valves 22 are installed are used for when pressure compensated piston 21 can not be realized internal and external pressure balance, prevent that instrument internal from producing too high malleation or negative pressure.When internal positive pressure power is too high, can discharges a part of oil from pressure relieving valve 22 and reduce pressure.When internal negative pressure power is too high, realize pressure balance thereby can enter a part of mud by pressure relieving valve 22.One pole plate 23 all is installed on every backup arm 10, pre-amplification circuit and button electrode are installed on the pole plate.
With reference to accompanying drawing 4, instrument main control and interface module are the control cores of entire circuit.Circuit mainly comprises a digital signal processor (DSP) and a field programmable gate array (FPGA).It mainly is the order of response from the remote unit circuit, for other circuit provides order and control, is the interface circuit between remote unit circuit and other electronic circuits.Instrument main control and interface module are according to the different command from the remote unit circuit, and control transmits and the reference signal module produces transmitting and reference signal of corresponding modes.Transmitting of producing delivered to the amplification module that transmits and amplified processing.Transmitting is divided into two-way after entering the amplification module that transmits, and one the tunnel directly amplifies processing, and another road carries out earlier amplifying processing again after the polarity inversion.Two paths of signals after the amplification is received coupling transformer.The output of coupling transformer coupling is connected to and drives bucking electrode group (telescoping ram housing and pole plate) and loop electrode.At interior quarter during state, instrument main control and interface module control transmit and the reference signal module is carved in producing, and this signal does not enter the amplification module that transmits, thereby not to the stratum emission current.Transmit and the reference signal module utilizes crystal oscillator as signal source, frequency division obtain the logging well signal source of required frequency is carried out in the crystal oscillator pulse by counter.The measuring circuit that transmits mainly to the temperature of the phasor voltage that transmits, electronic circuit, interior quarter signal and platen potentiometer voltage measure, measurement result is delivered to data acquisition and control module, and circuit mainly is made up of a double operational, a temperature pick up, a multiplexer switch circuit, phase sensitive detection circuit and low-pass filter circuit.Instrument comprises and comprises that two identical data acquisitions and control circuit, each piece circuit board all comprise a data processor (DSP), field programmable gate array (FPGA), A/D analog-digital converter, programmable gain amplifier and sampling hold circuit.Base when generation is used for 8.33 milliseconds of per 0.1 inch data acquisition produces the control signal that is used for the multiplex electronics on imaging pole plate and the subsidiary plate simultaneously.The analog signal that collects is carried out digitlization, pack then and give instrument control desire interface circuit.Two data acquisitions and control module utilize serial ports and instrument main control and interface module to carry out communication respectively.Collection and control module # 1 digitlization are from odd number pole plate and the potentiometric signal of hole diameter, and collection and control module # 2 digitlization are from even number pole plate and the potentiometric signal of hole diameter.
The double polarity plate drive circuit is used as the interface circuit between data acquisition and control circuit and the preceding discharge of the pole plate road, and double polarity plate driver module inside comprises the consistent circuit of two covers, and every suit circuit is all connecting the preceding road of discharging of three pole plates.Circuit kit is wherein being controlled the preceding discharge of the pole plate road in 1,3 and No. 5 pole plates of pole plate under the control of collection and control module #1.Another set of circuit is being controlled the preceding discharge of the pole plate road in 2,4 and No. 6 pole plates of pole plate under the control of collection and control module #2.Double polarity plate driver module output be+7.5V, 0V and-affluent signal of 7.5V.The counter that the signal output of+7.5V drives in the preceding discharge of the pole plate road increases progressively, thus the mutually deserved multiplex channel of select progressively.The output that drives signal is to carry out under the control from ADVCLK, the RSTCLK of data acquisition and control circuit and SYNC signal.When ADVCLK1 triggered, the signal that drives pole plate 1,3 and 5 was driven to+7.5V, gets back to 0V then.When RSTCLK1 triggered, the signal that drives pole plate 1,3 and 5 was driven to-7.5V, gets back to 0V then.SYNC is the counter in the initialization double polarity plate driver module periodically.
The bipolar plates receiving circuit is carried out the phasor measurement of button electrode current signal, and this module is made up of three identical circuit boards.Every circuit board is made up of the identical circuit of two covers, and every cover circuit all includes an input amplification/phase separation circuit, phase sensitive detection circuit and difference input low-pass filter circuit.Every circuit board is connected with corresponding two pole plates.The signal of gathering be small electrode current signal or interior quarter signal, by the collection of relay switching signal.Bipolar plates receives (#1, #2) responsible current signal that receives the small electrode of #1 and #2 pole plate respectively.Bipolar plates receives (#3, #4) responsible current signal that receives the small electrode of #3 and #4 pole plate respectively.Bipolar plates receives (#5, #6) responsible current signal that receives the small electrode of #5 and #6 pole plate respectively.Receive the signal that comes and deliver to data acquisition and control module.The conveying principle is, the signal of odd number pole plate is delivered to data acquisition and control module 1, and the signal of even number pole plate is delivered to data acquisition and control module 2.This circuit mainly is made up of amplifier/PHASE SEPARATION, phase sensitive detector and low-pass filter circuit.
The orientation sensor provides the three-dimensional data of instrument position in well.Sensor internal includes magnetometer system and accelerometer system.The sensor that all includes three mutually orthogonal installations in each system.The data of orientation sensor are directly delivered to orientation signal multiplexing module.Under control, each road signal is delivered to data acquisition and control module 1 by multiplexer from the selection control signal of data acquisition and control module 1.In addition, the axial signal of the Z of independent No. one accelerometer through delivering to data acquisition and control module 2 after the filtering processing, is handled the back as calculated as velocity correction.
The hole diameter signaling module is gathered the potentiometric signal of hole diameter, is used to measure the extension degree of backup arm, produces the positive and negative reference voltage of the gain ranging that is used for calibration data collection and control circuit simultaneously.The signal of hole diameter signaling module is gathered and is controlled by data acquisition and control module.Data acquisition and control module 1 gathered and control hole diameter signal 1,3 and 5, gather simultaneously the hole diameter signaling module interior quarter signal wherein one the tunnel as analog-to-digital scale signal.Data acquisition and control module 2 gathered and control hole diameter signal 2,4 and 6, gather simultaneously the hole diameter signaling module interior quarter signal wherein another road as analog-to-digital scale signal.
The motor control module mainly is under the control of instrument main control and interface module, and the rotation of control telescoping ram motor is opened and closed gathering thereby drive backup arm.The motor direction of rotation is determined by polarity of voltage.Change the rotation direction of motor by switched voltage polarity.
With reference to accompanying drawing 5, discharge road 6 main being responsible for are measured amplification to small electrode 5 current signals before the pole plate.Discharge road 6 is installed in pole plate inside before the pole plate.Each pole plate is equipped with the preceding discharge of pole plate road module, and whole instrument is equipped with the preceding discharge of six pole plates road 6 altogether.Amplification is measured to the current signal of 25 small electrodes 5 of respective electrode plate in the discharge road before each pole plate.Circuit mainly is made up of control circuit, signal amplification circuit and multiplex electronics.Multiplex electronics is responsible for selecting from the small-signal (about 3mV) of small electrode 5 and amplifying.Amplifier Gain is up to about 500.Control circuit is responsible for making multiplexer to carry out passage going forward one by one and select and reset.Control signal is sent by data acquisition and control module, after double polarity plate drives to the road of discharging before entering pole plate.The output signal of amplification module is delivered to the bipolar plates receiver module before the pole plate.
Claims (3)
1, a kind of wellface scanning imagery logging device with microresistivity, comprise electronic circuit and telescoping ram two parts, electronic circuit comprises the amplifying circuit that transmits, measuring circuit transmits, motor control circuit, transmit and reference signal circuit, the double polarity plate drive circuit, the bipolar plates receiving circuit, the orientation signal multiplexing circuit, the hole diameter signal circuit, data acquisition and control circuit, instrument main control and interface circuit, the remote unit circuit is connected with the orientation sensor, motor control circuit control telescoping ram is opened leg, receive leg, telescoping ram comprises pressure balancing system, the platen potentiometer, the hole diameter potentiometer, the backup arm actuating mechanism, the hole diameter backup arm, the pole plate device, the hole diameter backup arm pushes away the receipts motor and connects to form, it is characterized in that: the amplifying circuit that transmits drives the bucking electrode group to amplifying from the sinusoidal drive signals that transmits with reference signal circuit; The measuring circuit that transmits mainly to the temperature of the voltage that transmits, electronic circuit, interior quarter signal and platen potentiometer voltage measure; Transmit and reference signal circuit provides the stratum to drive signal, produce the internal calibration signal, also provide the phase-sensitive detection reference signal and the signal at interior quarter of be used to transmit measuring circuit and bipolar plates receiving circuit; The double polarity plate drive circuit is used as the interface circuit between data acquisition and control circuit and the preceding discharge of the pole plate road, and the double polarity plate drive circuit is by the consistent circuit of two covers, and every suit circuit is all connecting the preceding road of discharging of three pole plates; The bipolar plates receiving circuit is carried out the phasor measurement of button electrode current signal, it is made up of the identical circuit of two covers, every cover circuit all includes input amplifications/phase separation circuit, a phase sensitive detection circuit and a difference is imported low-pass filter circuit, has three bipolar circuit board for receiving and six imaging pole plates link together; The orientation signal multiplexing circuit mainly is that seven road direct current signals from the orientation sensor are carried out multiplexed transmission, plays the effect of filter network simultaneously; The hole diameter signal circuit is used to measure the extension of backup arm, produces the positive and negative reference voltage of the gain ranging that is used for calibration data collection and control circuit simultaneously, and the output signal of hole diameter signal circuit is gathered and controlled by data acquisition and control circuit; Data acquisition comprises two identical circuit boards with control circuit, each piece circuit board all comprises a data processor, field programmable gate array, A/D analog-digital converter, programmable gain amplifier and sampling hold circuit, generation is used for the required time base of data acquisition, produce the control signal that is used for the multiplex electronics on imaging pole plate and the subsidiary plate simultaneously, the analog signal that collects is carried out digitlization, pack then and give instrument control and interface circuit; Instrument main control and interface circuit mainly comprise a digital signal processor and a field programmable gate array, it mainly is the order of response from the remote unit circuit, for other circuit provides order and control, be the interface circuit between remote unit circuit and other electronic circuit; The remote unit circuit is responsible for receiving various command and transmitting digitized telemetered signal, and the bottom of telescoping ram is provided with 6 independently backup arms, and pole plate all is installed on each backup arm, and two row's small electrodes are installed above every pole plate.
2, wellface scanning imagery logging device with microresistivity according to claim 1, it is characterized in that: 150 small electrodes are housed on 6 pole plates altogether, the row of going up of odd number pole plate is 12 small electrodes, following row has 13 small electrodes, the row of going up of even number pole plate is 13 small electrodes, following row has 12 small electrodes, small electrode on each pole plate is connected with corresponding pole plate pre-amplification circuit by plug connector and connecting line, the pole plate pre-amplification circuit includes a bifurcation high-gain amplifier, one high-speed buffer and a multiplexer are used for selecting, amplification is from the current signal of small electrode.
3, the microresistivity scanning borehole wall according to claim 1 and 2 imaging is surveyed and instrument, it is characterized in that: the orientation sensor is the sensor of a bottled solid state, sensor has three magnetometers, three accelerometers and a temperature pick up, the rotation that is used to calculate azimuth, hole azimuth angle and the instrument of No. 1 pole plate from the data of magnetometer, from the drift angle that the data of accelerometer are used to calculate well, temperature pick up is used to monitor the temperature of orientation sensor internal.
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Effective date of registration: 20150921 Address after: 100029 Beijing Chaoyang District Hui Xin a No. twelve layer 6 Patentee after: SINOPEC OILFIELD SERVICE CORPORATION Patentee after: Logging Company of triumph petroleum engineering company limited of China Petrochemical Industry Address before: 257096 No. two, 313 North Road, Shandong, Dongying Patentee before: SINOPEC Shengli Petroleum Administration Well Logging Company |
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Effective date of registration: 20220223 Address after: 100029 Chaoyang District, Beijing Hui Xin Street six, Twelfth level. Patentee after: SINOPEC OILFIELD SERVICE Corp. Patentee after: Sinopec Jingwei Co.,Ltd. Patentee after: Shengli logging company of Sinopec Jingwei Co.,Ltd. Address before: 12 / F, No. 6, Huixin a, Chaoyang District, Beijing 100029 Patentee before: SINOPEC OILFIELD SERVICE Corp. Patentee before: Logging company of Sinopec Shengli Petroleum Engineering Co., Ltd |