CN114658423A - Active magnetic measurement system and method used in magnetic shielding mode - Google Patents
Active magnetic measurement system and method used in magnetic shielding mode Download PDFInfo
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- 238000005553 drilling Methods 0.000 claims description 10
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/09—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes
- E21B47/092—Locating or determining the position of objects in boreholes or wells, e.g. the position of an extending arm; Identifying the free or blocked portions of pipes by detecting magnetic anomalies
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/02—Determining slope or direction
- E21B47/024—Determining slope or direction of devices in the borehole
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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Abstract
The invention relates to an active magnetic measurement system and method used in a magnetic shielding mode. The system includes: a probe and a measuring tool; the detecting tube is connected with a winch with a cable through the cable, the winch with the cable is connected with a ground host, and the ground host is connected with a computer; the probe tube includes: the first triaxial fluxgate sensor and the gyro measurement module are arranged; the measuring tool is installed on the ground and is communicated with a computer through a ground host; the measuring tool is used for acquiring alternating magnetic field signals after being shielded by the sleeve and alternating magnetic field signals which are not shielded by the sleeve; the computer is used for determining an attenuation coefficient according to the alternating magnetic field signal after being shielded by the casing and the alternating magnetic field signal without being shielded by the casing, rechecking the attenuation coefficient, and further determining the spatial position relation between the magnetic joint and the probe in the well according to the rechecked attenuation coefficient and the alternating magnetic field signal obtained by the probe. The invention can improve the accuracy of measurement and positioning in the ferromagnetic casing.
Description
Technical Field
The invention relates to the field of drilling measurement, in particular to an active magnetic measurement system and method used in a magnetic shielding mode.
Background
In geological and oil drilling, in order to accurately control the trajectory of the borehole and to bring the drill bit to a specified position, downhole measurements are often made using instruments. The active magnetic measurement system is a measurement means with higher precision, and the basic principle is that regular magnetic field disturbance is formed in a space by rotating an artificial magnetic field with known strength, and after receiving the disturbance, the probe tube analyzes the relative spatial position relationship between the magnetic field and the probe tube through software. In practical applications, the artificial magnetic field is usually formed by embedding rare earth permanent magnets in a cylinder made of non-magnetic material, i.e. a magnetic joint, so as to rotate the magnetic joint to generate an alternating magnetic field signal. The probe tube is a rod-mounted cylinder consisting of various sensors and circuits and can measure the earth magnetic field, the gravity field and the dynamic alternating magnetic field. When the active magnetic measurement system works, the magnetic joint is driven by the screw motor connected at the rear side to rotate axially, so that magnetic field disturbance is formed. And a probe is usually placed on a target point at the other end of the space, the probe is connected to the lower end of an armored cable on a winch and is placed to the target depth of a certain finished well hole, the upper end of the winch cable is connected with a ground host, the host supplies power to the probe and converts signals acquired by the probe and then transmits the signals to a computer, and the computer obtains the spatial position relation between the magnetic joint and the probe in the well through analyzing data. The measuring method is that the probe tube firstly positions itself and then positions the magnetic joint, and the probe tube is responsible for collecting all signal parameters. The probe tube needs at least three parameters for positioning itself: apex angle, azimuth, and toolface. At present, a three-axis fluxgate sensor is generally adopted by a probe to measure magnetically related signals, wherein the signals comprise geomagnetic field data used for calculating the direction of the probe and alternating magnetic field signals sent by a magnetic joint.
In the current active magnetic positioning measurement, the probe tube must be placed at an exposed hole section under a target well, namely, at a distance (at least 2 meters) from ferromagnetic interferent such as a casing and an oil pipe, and the probe tube cannot be placed in the exposed hole section. However, in the field of drilling of petroleum, geology and soluble solid minerals, ferromagnetic casings are widely used as an effective bore wall support. The casing is a thin-shell cylinder widely used in the drilling fields of petroleum, geology, soluble solid minerals and the like, is usually made of steel and has various specifications and production processes. When the earth surface is drilled, the original stratum stress is damaged, and rocks and soil in the hole collapse without maintenance. At the moment, a casing is put in, and cement is used for filling an annular space formed by the hole wall and the casing, so that the casing and the stratum are integrated, and the functions of supporting the stratum and isolating underground water are achieved. When the probe tube is placed in the ferromagnetic sleeve for various reasons, the three-axis fluxgate sensor is interfered and shielded, the obtained geomagnetic parameters and the magnetic joint signals are also deformed and distorted, and the two important data are lacked, so that the conventional active magnetic positioning system cannot work normally.
Based on the above problems, there is a need for an active magnetic measurement system or method for use in magnetic shielding mode.
Disclosure of Invention
The invention aims to provide an active magnetic measurement system and method used in a magnetic shielding mode, which can improve the accuracy of measurement and positioning in a ferromagnetic sleeve.
In order to achieve the purpose, the invention provides the following scheme:
an active magnetic measurement system for use in a magnetic shielding mode, the active magnetic measurement system comprising: magnetic joint, take cable winch, ground host computer and computer, this system still includes: a probe and a measuring tool;
the probe is connected with a winch with a cable through a cable, the winch with the cable is connected with a ground host, and the ground host is connected with a computer; the probe tube comprises: the first triaxial fluxgate sensor and the gyro measurement module are arranged; the gyroscope measurement module is used for measuring the direction when the first three-axis fluxgate sensor cannot normally measure the direction;
the measuring tool is installed on the ground and is communicated with a computer through a ground host; the measuring tool is used for acquiring alternating magnetic field signals after being shielded by the sleeve and alternating magnetic field signals which are not shielded by the sleeve; the computer is used for determining an attenuation coefficient according to the alternating magnetic field signal after being shielded by the casing and the alternating magnetic field signal without being shielded by the casing, rechecking the attenuation coefficient, and further determining the spatial position relation between the magnetic joint and the probe in the well according to the rechecked attenuation coefficient and the alternating magnetic field signal obtained by the probe.
Optionally, the measurement tool includes: the magnetic sensor comprises a non-magnetic U-shaped frame, a magnetic emitter, a second triaxial fluxgate sensor and a non-magnetic centralizer;
the magnetic emitter is arranged at the end part of the first rod of the non-magnetic U-shaped frame and is away from the end part of the first rod by a first set distance; the second triaxial fluxgate sensor is arranged at the end part of the second rod without the magnetic U-shaped frame and is a second set distance away from the end part of the second rod; the nonmagnetic centralizer is arranged between the bottom of the nonmagnetic U-shaped frame and the second triaxial fluxgate sensor;
the non-magnetic centralizer is used for enabling the axial direction of the second triaxial fluxgate sensor to be parallel to the axial direction of the sleeve.
Optionally, the second tri-axial fluxgate sensor is coaxial with the second bar of the nonmagnetic clevis.
An active magnetic measurement method for use in a magnetic shielding mode, applied to an active magnetic measurement system for use in a magnetic shielding mode, comprising:
starting the magnetic transmitter, and acquiring an alternating magnetic field signal which is not shielded by a tube by using a second triaxial fluxgate sensor;
inserting a second rod of the nonmagnetic U-shaped frame into the sleeve, starting the magnetic transmitter, and acquiring an alternating magnetic field signal shielded by the sleeve by using a second triaxial fluxgate sensor;
determining an attenuation coefficient according to an alternating magnetic field signal which is not subjected to pipe shielding and an alternating magnetic field signal which is subjected to sleeve shielding;
rechecking the attenuation coefficient, and determining the rechecked attenuation coefficient;
and determining the spatial position relation between the magnetic joint and the probe in the well being drilled according to the alternating magnetic field signal acquired by the probe and the decay coefficient after rechecking.
Optionally, the attenuation coefficient includes: the attenuation coefficient in the radial plane and the axial attenuation coefficient.
Optionally, the rechecking the attenuation coefficient and determining the rechecked attenuation coefficient specifically include:
changing the attenuation coefficient by a set gradient to determine an attenuation coefficient set;
obtaining an alternating magnetic field signal according to the probe and determining the corresponding total field strength according to each attenuation coefficient in the attenuation coefficient set;
determining an error coefficient according to the minimum value and the maximum value in the total field intensity of each attenuation coefficient;
and taking the attenuation coefficient corresponding to the minimum error coefficient as the attenuation coefficient after the double check.
An active magnetic measurement system for use in a magnetic shielding mode for implementing said active magnetic measurement method for use in a magnetic shielding mode, comprising:
the alternating magnetic field signal acquisition unit which is not shielded by the tube is used for starting the magnetic transmitter and acquiring the alternating magnetic field signal which is not shielded by the tube by utilizing the second three-axis fluxgate sensor;
the alternating magnetic field signal acquisition unit is used for inserting a second rod without a magnetic U-shaped frame into the sleeve, starting the magnetic transmitter and acquiring the alternating magnetic field signal shielded by the sleeve by using a second triaxial fluxgate sensor;
the attenuation coefficient determining unit is used for determining an attenuation coefficient according to the alternating magnetic field signal which is not subjected to pipe shielding and the alternating magnetic field signal which is subjected to sleeve shielding;
the rechecked attenuation coefficient determining unit is used for rechecking the attenuation coefficient and determining the rechecked attenuation coefficient;
and the spatial position relation determining unit is used for determining the spatial position relation between the magnetic joint and the probe in the well drilling according to the alternating magnetic field signal acquired by the probe and the decay coefficient after rechecking.
Optionally, the attenuation coefficient includes: the attenuation coefficient in the radial plane and the axial attenuation coefficient.
Optionally, the attenuation coefficient determining unit after the rechecking specifically includes:
the attenuation coefficient set determining subunit is used for changing the attenuation coefficient by a set gradient to determine an attenuation coefficient set;
the total field intensity determining subunit is used for determining the corresponding total field intensity according to the alternating magnetic field signal obtained by the probe and each attenuation coefficient in the attenuation coefficient set;
an error coefficient determining subunit, configured to determine an error coefficient according to a minimum value and a maximum value in the total field intensity of each attenuation coefficient;
and the attenuation coefficient determination subunit is used for taking the attenuation coefficient corresponding to the minimum error coefficient as the attenuation coefficient after the rechecking.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the active magnetic measurement system and method used in the magnetic shielding mode, when the first triaxial fluxgate sensor cannot normally measure the orientation, the gyroscope measurement module is used for measuring the orientation, and normal measurement can be performed in a magnetic abnormal environment; the measuring tool is installed on the ground and is communicated with a computer through a ground host; and determining an attenuation coefficient according to the alternating magnetic field signal which is obtained by the measuring tool and is shielded by the sleeve and the alternating magnetic field signal which is not shielded by the pipe, rechecking the attenuation coefficient, and further determining the spatial position relation between the magnetic joint and the probe in the well according to the rechecked attenuation coefficient and the alternating magnetic field signal obtained by the probe. Under the condition that shaft bottom materials are not required to be taken out, the magnetic field characteristics are utilized to measure the attenuation coefficient of the extremely-low frequency magnetic field of the casing positioned at the shaft bottom, and the shielded alternating magnetic field signals are restored, so that the active magnetic measurement system can be normally applied to a geomagnetic abnormal area, and can also carry out positioning measurement under the shielding condition of a ferromagnetic casing.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a measurement tool used in an active magnetic measurement system in a magnetic shielding mode according to the present invention;
FIG. 2 is a schematic view of a static magnetic field coordinate system;
FIG. 3 is a schematic diagram of a rotating magnetic field coordinate system;
FIG. 4 is a flow chart of the active magnetic measurement method in magnetic shielding mode according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide an active magnetic measurement system and method used in a magnetic shielding mode, which can improve the accuracy of measurement and positioning in a ferromagnetic sleeve.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
An active magnetic measurement system for use in a magnetic shielding mode, the active magnetic measurement system comprising: magnetic joint, take cable winch, ground host computer and computer, this system still includes: a probe and a measuring tool;
the detection tube is connected with a winch with a cable through the cable, the winch with the cable is connected with a ground host, and the ground host is connected with a computer; the probe tube comprises: the first triaxial fluxgate sensor and the gyro measurement module are arranged; the gyroscope measurement module is used for measuring the direction when the first three-axis fluxgate sensor cannot normally measure the direction;
the measuring tool is installed on the ground and is communicated with a computer through a ground host; the measuring tool is used for acquiring alternating magnetic field signals after being shielded by the sleeve and alternating magnetic field signals which are not shielded by the sleeve; the computer is used for determining an attenuation coefficient according to the alternating magnetic field signal after being shielded by the casing and the alternating magnetic field signal without being shielded by the casing, rechecking the attenuation coefficient, and further determining the spatial position relation between the magnetic joint and the probe in the well according to the rechecked attenuation coefficient and the alternating magnetic field signal obtained by the probe.
As shown in fig. 1, the measurement tool includes: the magnetic sensor comprises a non-magnetic U-shaped frame, a magnetic emitter, a second triaxial fluxgate sensor and a non-magnetic centralizer;
the magnetic emitter is arranged at the end part of the first rod of the non-magnetic U-shaped frame and is away from the end part of the first rod by a first set distance; the second triaxial fluxgate sensor is arranged at the end part of the second rod of the nonmagnetic U-shaped frame and is a second set distance away from the end part of the second rod; the nonmagnetic centralizer is arranged between the bottom of the nonmagnetic U-shaped frame and the second triaxial fluxgate sensor; the first set distance and the second set distance are different.
The non-magnetic centralizer is used for enabling the axial direction of the second triaxial fluxgate sensor to be parallel to the axial direction of the sleeve.
The whole set of measuring tool is made of non-magnetic materials except for the small magnetic emitter, has certain rigidity and is not easy to deform.
The second triaxial fluxgate sensor is coaxial with the second rod of the nonmagnetic U-shaped frame.
The magnetic joint is positioned in a well under construction, the front side of the magnetic joint is connected with a drill bit, and the rear side of the magnetic joint is connected with a screw rod and the like. The magnetic joint can rotate along with the screw rod to generate an alternating magnetic field signal. The probe is placed at the depth of an underground target ore bed and is used for collecting alternating magnetic field signals sent by the magnetic joint. The probe is connected with a winch on the ground through an armored cable, and the other end of the cable on the winch is connected with a ground host. After the data is collected by the probe tube, the analog signal is transmitted to the ground host computer through the cable, and the host computer is used for supplying power to the probe tube, converting the analog signal into a digital signal and transmitting the digital signal to the computer. The computer is provided with corresponding acquisition software which can control the underground probe to execute various functions, and simultaneously, the computer is also provided with analysis software which can obtain the position relation between the probe and the magnetic joint (drill bit) by analyzing the data acquired by the probe. Through the position relation, the deviation between the current drill bit and the probe can be known, and the track is adjusted to reach the target position.
The specific measurement steps are as follows:
1) the magnetic joint is connected behind the drill bit and is put into the well to be drilled, and normal drilling construction is carried out. The probe is put into a target, the probe is blocked in the ferromagnetic sleeve for various reasons, the first three-axis fluxgate sensor cannot normally measure the azimuth, the gyro measuring module in the probe is started to measure the true azimuth (B), and the azimuth (A) is obtained by inquiring the local magnetic declination (C) and calculating, wherein A is B + C.
2) When the drilling well is drilled to a certain distance (such as 100 meters) away from the probe, the measurement link of the alternating magnetic field signal is entered. And at the moment, the drilling of the well is stopped, the magnetic joint is rotated as it is, then the probe is started, and the alternating magnetic field signal sent by the magnetic joint is captured by using the first three-axis fluxgate sensor. Because the probe tube is positioned in the sleeve, the amplitude of the alternating magnetic field signal is reduced after the alternating magnetic field signal is shielded by the sleeve.
3) Surface measurement of casing attenuation coefficient. And finding a complete casing with the same specification and model as the underground casing on the ground, and placing the complete casing in an environment with less magnetic interference. And a measuring tool is used, a centralizer with a suitable type is arranged at one end provided with the second triaxial fluxgate sensor, the centralizer is inserted into the sleeve to a depth of at least 1 m, one end provided with the small magnetic field emitter is arranged outside the sleeve, and no other object is shielded between the second triaxial fluxgate sensor and the emitter except for the sleeve to be measured. The non-magnetic centralizer has the effect of ensuring that the axial direction of the three-axis fluxgate sensor is parallel to the axial direction of the sleeve. After the second three-axis fluxgate sensor is connected with the ground host and the computer, the magnetic transmitter is turned on, the probe is started to measure alternating magnetic field signals shielded By the sleeve under the condition of keeping the whole tool still, the alternating magnetic field signals are Bx, By, Bz, the Bz direction is the same as the probe axis, the Bx and the By are radial, and the two are vertical to each other.
Taking out the measuring tool from the casing, placing the measuring tool in an environment which is far away from the casing and has small magnetic interference under the condition of keeping the relative posture of the magnetic emitter and the probe unchanged, starting the magnetic field emitter again, and measuring the three-axis magnetic field parameters Bx1, By1 and Bz1 when no casing is shielded.
Order to
Two initial attenuation coefficients were obtained: s1 ═ BR/BR1, S2 ═ Bz/Bz 1;
4) and (5) performing attenuation coefficient rechecking and positioning calculation. And measuring the magnetic joint signal to obtain original alternating magnetic field data, wherein the data are shielded by the sleeve, and normal positioning calculation is carried out after the signal is restored by using the initial attenuation coefficient obtained in the previous step. After the casing is put into the stratum, deformation corrosion and other conditions can occur, and the magnetic shielding performance of the casing is possibly different from that of the complete casing on the ground surface, so further rechecking calculation is carried out.
The principle of rechecking is as follows:
as shown in fig. 2, which is a three-dimensional coordinate system of a static magnetic field, a cylindrical permanent magnet is located at an origin O of coordinates, NS pole coincides with Z axis, P is any point in space, an OP distance from an origin line is r, a magnet volume is much smaller than r, and a magnetic dipole can be assumed, so that a magnetic field expression at a space point P is:
in the above formula, M is the magnetic moment value, mu0Is a vacuum magnetic permeability.
The total magnetic field strength is written as:
substituting formula (1) into formula (la):
the magnet rotates in the XZ plane about the Y axis, and no matter where the NS pole rotates, a coordinate system can be established as shown in FIG. 3, and the line OP is connected to the new X1Z1The planar projection may vary by the angle value θ and
changes occur but the magnetic field expression is the same as (1).
The total strength of the magnetic field can be written as follows according to equations (1) and (2):
from the above equation, when the magnetic field rotates around the Y axis, the total intensity of the magnetic field is related to the angle between the connecting line OP and the pole NS of the magnet, and Bt has the minimum value when ψ ═ pi/2:
when ψ is minimum, Bt has a maximum value:
(7) comparing equation (6) with equation (6), equation (6) can be obtained:
wherein
S1 and S2 are attenuation coefficients measured by the third step of the above-mentioned tooling, and the calculation is started with the attenuation coefficients as initial values, and each change is carried out (S1, S2)iThe following operations are performed on the original data:
using normal positioning method, obtaining corresponding result by formula (1)
Obtaining the total field value Bt according to the formula (2)iAnd finding two maximum and minimum values in a series of total field values, Bt respectivelymaxiAnd Btmini. Varying equation (7) and finding the absolute value, for each set of attenuation coefficients (S1, S2)iAre all provided with
Wherein
The attenuation coefficient at the minimum value in the formula (10) is the real attenuation coefficient of the underground casing, and the result at the moment
And the spatial position relationship between the magnetic joint and the probe tube. At this time
The final result is that r is the distance from the magnetic field emission source to the probe, the latter two being the angle values;
fig. 4 is a schematic flow chart of an active magnetic measurement method in a magnetic shielding mode according to the present invention, and as shown in fig. 4, the active magnetic measurement method in the magnetic shielding mode according to the present invention is applied to the active magnetic measurement system in the magnetic shielding mode, and includes:
s401, starting a magnetic transmitter, and acquiring an alternating magnetic field signal which is not shielded by a pipe by using a second triaxial fluxgate sensor;
s402, inserting a second rod without a magnetic U-shaped frame into a sleeve, starting a magnetic emitter, and acquiring an alternating magnetic field signal shielded by the sleeve by using a second triaxial fluxgate sensor;
s403, determining an attenuation coefficient according to the alternating magnetic field signal which is not subjected to pipe shielding and the alternating magnetic field signal which is subjected to sleeve shielding;
s404, rechecking the attenuation coefficient, and determining the rechecked attenuation coefficient;
s404 specifically includes:
changing the attenuation coefficient by a set gradient to determine an attenuation coefficient set;
determining corresponding total field strength according to the alternating magnetic field signal obtained by the probe and each attenuation coefficient in the attenuation coefficient set;
determining an error coefficient according to the minimum value and the maximum value in the total field intensity of each attenuation coefficient;
and taking the attenuation coefficient corresponding to the minimum error coefficient as the attenuation coefficient after the double check.
S405, determining the spatial position relation between the magnetic joint and the probe in the well being drilled according to the alternating magnetic field signal obtained by the probe and the decay coefficient after rechecking.
The attenuation coefficient includes: the attenuation coefficient in the radial plane and the axial attenuation coefficient.
An active magnetic measurement system for use in a magnetic shielding mode for implementing said active magnetic measurement method for use in a magnetic shielding mode, comprising:
the alternating magnetic field signal acquisition unit which is not shielded by the tube is used for starting the magnetic transmitter and acquiring the alternating magnetic field signal which is not shielded by the tube by utilizing the second three-axis fluxgate sensor;
the alternating magnetic field signal acquisition unit is used for inserting a second rod without a magnetic U-shaped frame into the sleeve, starting the magnetic transmitter and acquiring the alternating magnetic field signal shielded by the sleeve by using a second triaxial fluxgate sensor;
the attenuation coefficient determining unit is used for determining an attenuation coefficient according to the alternating magnetic field signal which is not shielded by the sleeve and the alternating magnetic field signal which is shielded by the sleeve;
the rechecked attenuation coefficient determining unit is used for rechecking the attenuation coefficient and determining the rechecked attenuation coefficient;
and the spatial position relation determining unit is used for determining the spatial position relation between the magnetic joint and the probe in the well drilling according to the alternating magnetic field signal acquired by the probe and the decay coefficient after rechecking.
The attenuation coefficient includes: the attenuation coefficient in the radial plane and the axial attenuation coefficient.
The attenuation coefficient determination unit after the rechecking specifically includes:
the attenuation coefficient set determining subunit is used for changing the attenuation coefficient by a set gradient to determine an attenuation coefficient set;
the total field intensity determining subunit is used for determining the corresponding total field intensity according to the alternating magnetic field signal acquired by the probe and each attenuation coefficient in the attenuation coefficient set;
an error coefficient determination subunit configured to determine an error coefficient from the minimum value and the maximum value in the total field intensity of each attenuation coefficient;
and the attenuation coefficient determination subunit is used for taking the attenuation coefficient corresponding to the minimum error coefficient as the attenuation coefficient after the rechecking.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the system disclosed by the embodiment, the description is relatively simple because the system corresponds to the method disclosed by the embodiment, and the relevant points can be referred to the method part for description.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. An active magnetic measurement system for use in a magnetic shielding mode, the active magnetic measurement system comprising: magnetic connector, take cable winch, ground host computer and computer, its characterized in that still includes: a probe and a measuring tool;
the detection tube is connected with a winch with a cable through the cable, the winch with the cable is connected with a ground host, and the ground host is connected with a computer; the probe tube comprises: the first triaxial fluxgate sensor and the gyro measurement module are arranged; the gyroscope measurement module is used for measuring the direction when the first three-axis fluxgate sensor cannot normally measure the direction;
the measuring tool is installed on the ground and is communicated with a computer through a ground host; the measuring tool is used for acquiring alternating magnetic field signals after being shielded by the sleeve and alternating magnetic field signals which are not shielded by the sleeve; the computer is used for determining an attenuation coefficient according to the alternating magnetic field signal after being shielded by the casing and the alternating magnetic field signal without being shielded by the casing, rechecking the attenuation coefficient, and further determining the spatial position relation between the magnetic joint and the probe in the well according to the rechecked attenuation coefficient and the alternating magnetic field signal obtained by the probe.
2. The active magnetic measurement system for use in magnetic shielding mode of claim 1, wherein said measurement tool comprises: the magnetic sensor comprises a non-magnetic U-shaped frame, a magnetic emitter, a second triaxial fluxgate sensor and a non-magnetic centralizer;
the magnetic emitter is arranged at the end part of the first rod of the non-magnetic U-shaped frame and is away from the end part of the first rod by a first set distance; the second triaxial fluxgate sensor is arranged at the end part of the second rod without the magnetic U-shaped frame and is a second set distance away from the end part of the second rod; the nonmagnetic centralizer is arranged between the bottom of the nonmagnetic U-shaped frame and the second triaxial fluxgate sensor;
the non-magnetic centralizer is used for enabling the axial direction of the second triaxial fluxgate sensor to be parallel to the axial direction of the sleeve.
3. Active magnetic measuring system for magnetic shielding mode according to claim 2 characterized in that said second tri-axial fluxgate sensor is coaxial to the second bar of the nonmagnetic clevis.
4. An active magnetic measurement method for use in a magnetic shielding mode, applied to an active magnetic measurement system for use in a magnetic shielding mode according to any one of claims 1 to 3, comprising:
starting the magnetic transmitter, and acquiring an alternating magnetic field signal which is not shielded by a pipe by using a second triaxial fluxgate sensor;
inserting a second rod of the non-magnetic U-shaped frame into the sleeve, starting the magnetic emitter, and acquiring an alternating magnetic field signal shielded by the sleeve by using a second triaxial fluxgate sensor;
determining an attenuation coefficient according to an alternating magnetic field signal which is not subjected to pipe shielding and an alternating magnetic field signal which is subjected to sleeve shielding;
rechecking the attenuation coefficient, and determining the rechecked attenuation coefficient;
and determining the spatial position relation between the magnetic joint and the probe in the well being drilled according to the alternating magnetic field signal acquired by the probe and the decay coefficient after rechecking.
5. An active magnetic measurement method for use in magnetic shielding mode according to claim 4, characterized in that the attenuation coefficient comprises: the attenuation coefficient in the radial plane and the axial attenuation coefficient.
6. The active magnetic measurement method for the magnetic shielding mode according to claim 4, wherein the rechecking the attenuation coefficient and determining the rechecked attenuation coefficient specifically comprises:
changing the attenuation coefficient by a set gradient to determine an attenuation coefficient set;
obtaining an alternating magnetic field signal according to the probe and determining the corresponding total field strength according to each attenuation coefficient in the attenuation coefficient set;
determining an error coefficient according to the minimum value and the maximum value in the total field intensity of each attenuation coefficient;
and taking the attenuation coefficient corresponding to the minimum error coefficient as the attenuation coefficient after the double check.
7. An active magnetic measurement system for use in magnetic shielding mode for implementing an active magnetic measurement method for use in magnetic shielding mode according to any of claims 4 to 6, comprising:
the alternating magnetic field signal acquisition unit which is not shielded by the tube is used for starting the magnetic transmitter and acquiring the alternating magnetic field signal which is not shielded by the tube by utilizing the second three-axis fluxgate sensor;
the alternating magnetic field signal acquisition unit is used for inserting a second rod without a magnetic U-shaped frame into the sleeve, starting the magnetic transmitter and acquiring the alternating magnetic field signal shielded by the sleeve by using a second triaxial fluxgate sensor;
the attenuation coefficient determining unit is used for determining an attenuation coefficient according to the alternating magnetic field signal which is not subjected to pipe shielding and the alternating magnetic field signal which is subjected to sleeve shielding;
the rechecked attenuation coefficient determining unit is used for rechecking the attenuation coefficient and determining the rechecked attenuation coefficient;
and the spatial position relation determining unit is used for determining the spatial position relation between the magnetic joint and the probe in the well drilling according to the alternating magnetic field signal acquired by the probe and the decay coefficient after rechecking.
8. An active magnetic measurement system for use in magnetic shielding mode according to claim 7, characterized in that the attenuation coefficient comprises: the attenuation coefficient in the radial plane and the axial attenuation coefficient.
9. Active magnetic measurement system for use in magnetic shielding mode according to claim 7, characterized in that said re-checked attenuation coefficient determination unit comprises in particular:
the attenuation coefficient set determining subunit is used for changing the attenuation coefficient by a set gradient to determine an attenuation coefficient set;
the total field intensity determining subunit is used for determining the corresponding total field intensity according to the alternating magnetic field signal acquired by the probe and each attenuation coefficient in the attenuation coefficient set;
an error coefficient determining subunit, configured to determine an error coefficient according to a minimum value and a maximum value in the total field intensity of each attenuation coefficient;
and the attenuation coefficient determination subunit is used for taking the attenuation coefficient corresponding to the minimum error coefficient as the attenuation coefficient after the rechecking.
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| CN202210346967.XA CN114658423A (en) | 2022-04-01 | 2022-04-01 | Active magnetic measurement system and method used in magnetic shielding mode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116172540A (en) * | 2023-04-28 | 2023-05-30 | 长春市鑫睿商贸有限公司 | Method for detecting magnetic localizer in tissue focus and method for using detection device thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116172540A (en) * | 2023-04-28 | 2023-05-30 | 长春市鑫睿商贸有限公司 | Method for detecting magnetic localizer in tissue focus and method for using detection device thereof |
| CN116172540B (en) * | 2023-04-28 | 2023-07-04 | 长春市鑫睿商贸有限公司 | Method for detecting magnetic localizer in tissue focus and method for using detection device thereof |
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