CN105804724B - An ultrasonic liquid level monitoring device for petroleum drilling - Google Patents
An ultrasonic liquid level monitoring device for petroleum drilling Download PDFInfo
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- CN105804724B CN105804724B CN201410837099.0A CN201410837099A CN105804724B CN 105804724 B CN105804724 B CN 105804724B CN 201410837099 A CN201410837099 A CN 201410837099A CN 105804724 B CN105804724 B CN 105804724B
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- 239000003208 petroleum Substances 0.000 title claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 10
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- 238000000034 method Methods 0.000 description 7
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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- Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
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Abstract
Description
技术领域technical field
本发明涉及石油、天然气钻井的液位监控设备，更具体的说，本发明涉及一种石油钻井超声波液位监控装置。The invention relates to oil and natural gas drilling liquid level monitoring equipment, more specifically, the invention relates to an oil drilling ultrasonic liquid level monitoring device.
背景技术Background technique
在石油、天然气勘探、开采钻井时,为了冷却钻头、实施喷射钻井，以及将井底钻头切削下来的岩削从井底带到地面都要使用钻井泥浆，另外，还可以通过调整钻井泥浆的密度，使井眼环空的泥浆液柱与井下的压力相平衡，这种平衡可以防止可能发生的井喷事故。在起钻过程中，当提起钻具时，井筒液位将下降，其下降高度与起钻钻杆的数量(长度)成正比，而应补充的钻井用泥浆的体积亦与起钻钻杆的体积相当，并通过泥浆灌注装置注入井筒内。In oil and natural gas exploration and drilling, drilling mud is used to cool the drill bit, implement jet drilling, and bring the rock cut by the bottom hole drill bit from the bottom of the well to the surface. In addition, the density of the drilling mud can also be adjusted. , so that the mud liquid column in the wellbore annulus is balanced with the downhole pressure, and this balance can prevent possible blowout accidents. During the tripping process, when the drilling tool is lifted, the wellbore liquid level will drop, and the height of the drop is proportional to the number (length) of the tripping drill pipe, and the volume of drilling mud that should be replenished is also proportional to the length of the tripping drill pipe. The volume is equivalent, and it is injected into the wellbore through the mud injection device.
常规的钻井泥浆灌注装置包括主控制机、带搅拌器的泥浆罐及其液位监测器，包括泥浆泵、电动机、电控箱及流量传感器在内的灌注机构，溢流返回机构。其灌注方法是起钻时通过人工计算起出的钻杆数，然后输入主机处理后向灌注机构发出灌注指令及需注入的泥浆体积，经泥浆泵及设于其泵口的流量传感器执行、计量，同时将信息返馈主机以控制其灌注量。A conventional drilling mud injection device includes a main controller, a mud tank with an agitator and its liquid level monitor, an injection mechanism including a mud pump, an electric motor, an electric control box and a flow sensor, and an overflow return mechanism. The filling method is to manually calculate the number of drill pipes pulled out when pulling out the drill, and then input the main engine for processing, and then send the filling command and the volume of mud to be injected to the filling mechanism, which are executed and measured by the mud pump and the flow sensor installed at the pump port. , while feeding information back to the host to control its perfusion volume.
正常情况下,泥浆池流出的泥浆和流入的泥浆保持平衡。如果出现不平衡,将意味着要发生井喷或漏井。当井筒内泥浆液位下降时要及时准确的灌注泥浆，因此实时监控井下钻井液位的深度变化十分必要。Under normal circumstances, the outflow of mud from the mud pool is in balance with the inflow of mud. If there is an imbalance, it will mean a blowout or leakage. When the mud level in the wellbore drops, it is necessary to inject mud in time and accurately, so it is necessary to monitor the depth change of the downhole drilling fluid level in real time.
大多数情况下，石油井下的液位监控是凭人工经验进行液位判定识别，并不能做到实时监测液位，既不科学，也不确切。In most cases, the liquid level monitoring of oil wells is based on manual experience to determine and identify the liquid level, and it cannot monitor the liquid level in real time, which is neither scientific nor accurate.
对泥浆池液面进行测量，现有技术一般是现场采用一种浮子式液面检测器和带刻度的标尺，需要钻井工人进行人工观测、记录和对比，再判断是否出现溢流或井漏。因此，在正常情况下，从泥浆罐中泵到井下的泥浆与从井下返回的泥浆量应基本相等，但是在遇到井漏时，从井下返回的泥浆就会很少或者完全失返，这时泥浆罐中的泥浆液面就会快速下降；或者在遇到井下突然发生的高压而产生井涌时，井下向上的压力就会推动井下环空中的泥浆向上涌，并进入泥浆罐，这时泥浆罐中泥浆液面就会快速的上升；当这两种情况发生时，如果不能及时发现并采取灌注泥浆堵漏或者加重泥浆实施压井，就会造成严重的事故。为了及时了解泥浆罐中液面的高低，目前基本方法是在钻达预定层位时安排人员随时检测泥浆罐中的液面，还在泥浆罐上配备有液位显示器，显示器的另一端由软绳连接一个浮子，当液面处于设定的高度时，刚好将浮子浮起，显示器上的读数也在设定的位置，当液位下降或者超过设定的高度时，显示器就会被浮子拉着向下或者向上显示出危险的液位；还有的采用声波或者光对液面进行液面高低进行测试，测出超过液位的上、下限位时就会报警。目前这些装置的问题是:前者由软绳连接，因此测量的液位不准确，有时还会发生误报；后者虽然采用了现代技术，但是所有的装置都是电子产品，在钻井现场的恶劣环境中使用很容易被损坏，特别是对泥浆罐进行清洗时，不可避免的会对这些电子产品带来损坏，而且维护费用也很贵，维修也必须要专业技术人员才能完成。To measure the liquid level of the mud pool, the prior art generally uses a float type liquid level detector and a scale with scale on site, requiring drilling workers to manually observe, record and compare, and then judge whether there is overflow or lost circulation. Therefore, under normal circumstances, the amount of mud pumped from the mud tank to the downhole and the amount of mud returned from the downhole should be basically equal, but in the event of lost circulation, the mud returned from the downhole will be little or completely lost. The liquid level of the mud in the mud tank will drop rapidly; or when a well kick occurs due to the sudden high pressure downhole, the upward pressure from the downhole will push the mud in the downhole annulus to surge upward and enter the mud tank. The liquid level of the mud in the mud tank will rise rapidly; when these two situations occur, if the leakage cannot be detected in time and the leakage is blocked by pouring mud or aggravated mud is used to kill the well, serious accidents will be caused. In order to keep abreast of the liquid level in the mud tank, the current basic method is to arrange personnel to detect the liquid level in the mud tank at any time when drilling reaches the predetermined layer, and a liquid level indicator is equipped on the mud tank, and the other end of the display is controlled by a soft The rope is connected to a float. When the liquid level is at the set height, the float just floats, and the reading on the display is also at the set position. When the liquid level drops or exceeds the set height, the display will be pulled by the float. The dangerous liquid level is displayed downward or upward; some use sound waves or light to test the liquid level of the liquid level, and when the upper and lower limits of the liquid level are measured, it will alarm. The problem with these devices at present is: the former is connected by a flexible rope, so the measured liquid level is inaccurate, and sometimes false alarms occur; although the latter uses modern technology, all devices are electronic products, and they are difficult to operate under the harsh conditions of the drilling site. It is easy to be damaged when used in the environment, especially when cleaning the mud tank, it will inevitably cause damage to these electronic products, and the maintenance cost is also very expensive, and the maintenance must be completed by professional technicians.
另外泥浆罐体积大，发生井涌或井漏后，泥浆罐液位变化缓慢，不能灵敏地监控井涌和井漏事故。 因此，需要一种快速、灵敏监控泥浆的系统。In addition, the mud tank has a large volume, and after a well kick or a well leakage occurs, the liquid level of the mud tank changes slowly, so the well kick and well leakage accidents cannot be monitored sensitively. Therefore, there is a need for a system for rapid and sensitive monitoring of mud.
对于井筒内的泥浆液位，国内目前没有成熟可靠的技术进行准确实时的监控，更无法直接利用超声波原理进行井下液位检测，尤其不能做到非接触式的应用。国外利用超声波对液态介质的研究也有。但是由于钻井液（泥浆），尤其是油基泥浆对超声波的散射和吸收特性，即便是短距离传递超声波信号都非常困难。For the mud level in the wellbore, there is currently no mature and reliable technology in China for accurate and real-time monitoring, and it is impossible to directly use the ultrasonic principle to detect the downhole liquid level, especially non-contact application. There are also studies abroad on the use of ultrasonic waves for liquid media. However, due to the scattering and absorption characteristics of drilling fluid (mud), especially oil-based mud, to ultrasonic waves, it is very difficult to transmit ultrasonic signals even in a short distance.
发明内容Contents of the invention
本发明的目的在于有效克服上述技术的不足，提供一种石油钻井超声波液位监控装置，该装置利用超声波在不同介质下具有不同的传播速度的特性以及气体、液体、固体介质不同的穿透特性，对井筒内液位进行实时监测。The purpose of the present invention is to effectively overcome the deficiencies of the above-mentioned technologies and provide an ultrasonic liquid level monitoring device for oil drilling, which utilizes the characteristics of ultrasonic waves having different propagation speeds in different media and the different penetration characteristics of gas, liquid and solid media , Real-time monitoring of the liquid level in the wellbore.
本发明的技术方案是这样实现的：它包括地面控制装置和超声波液位检测仪，其原理及实施方案在于：The technical scheme of the present invention is achieved in that it comprises a ground control device and an ultrasonic liquid level detector, and its principle and implementation plan are:
所述地面控制装置包括供电电源、数据采集器、控制器、显示器以及触发器，所述数据采集器、触发器以及显示器均与控制器电性连接；The ground control device includes a power supply, a data collector, a controller, a display and a trigger, and the data collector, the trigger and the display are all electrically connected to the controller;
所述超声波液位检测仪包括多组超声波发射传感器和超声波接收传感器，所述超声波发射传感器和超声波接收传感器均连接至数据采集器上，所述触发器电性连接至数据采集器上，且该触发器还连接至上述的超声波发射传感器和超声波接收传感器上。超声波液位检测仪是跟随内套管下井的，其下钻深度即为所需监控、检测点液位（或气体）深度，因此是对The ultrasonic liquid level detector includes multiple sets of ultrasonic transmitting sensors and ultrasonic receiving sensors, the ultrasonic transmitting sensors and ultrasonic receiving sensors are connected to the data collector, the trigger is electrically connected to the data collector, and the The trigger is also connected to the above-mentioned ultrasonic transmitting sensor and ultrasonic receiving sensor. The ultrasonic liquid level detector goes downhole following the inner casing, and its drilling depth is the depth of the liquid level (or gas) at the required monitoring and detection point, so it is suitable for
钻井液位的实时监测。Real-time monitoring of drilling fluid level.
所述供电电源与所述的数据采集器、触发器、超声波发射传感器、超声波接收传感器均电性连接，用于提供所需的电能。The power supply is electrically connected to the data collector, the trigger, the ultrasonic transmitting sensor, and the ultrasonic receiving sensor to provide the required electric energy.
优选地，所述超声波液位检测仪的上端连接于内套管上，下端连接于接箍上，且接箍的下端则与另一节内套管相连接。Preferably, the upper end of the ultrasonic liquid level detector is connected to the inner casing, the lower end is connected to a coupling, and the lower end of the coupling is connected to another section of the inner casing.
优选地，所述超声波液位检测仪还包括支撑座套和超声波发射接收集成电路板，所述超声波发射传感器和超声波接收传感器相对的设置于支撑套座的两侧，支撑套座具有与内套管相连通的异形槽，所述超声波发射传感器和超声波接收传感器均电性连接在超声波发射接收集成电路板上。Preferably, the ultrasonic liquid level detector also includes a supporting seat cover and an ultrasonic transmitting and receiving integrated circuit board, the ultrasonic transmitting sensor and the ultrasonic receiving sensor are arranged on both sides of the supporting sleeve opposite to each other, and the supporting sleeve has a The pipes are connected to the special-shaped grooves, and the ultrasonic transmitting sensor and the ultrasonic receiving sensor are both electrically connected to the ultrasonic transmitting and receiving integrated circuit board.
上述的结构中，所述超声波液位检测仪上连接有钢管电缆，钢管电缆的另一端连接至供电电源和数据采集器上。In the above structure, a steel pipe cable is connected to the ultrasonic liquid level detector, and the other end of the steel pipe cable is connected to a power supply and a data collector.
上述的结构中，所述的内套管的外表面上安装有电缆卡箍和电缆保护器，所述电缆卡箍用于紧固上述的钢管电缆，电缆保护器对电缆起来保护作用。In the above structure, a cable clamp and a cable protector are installed on the outer surface of the inner sleeve, the cable clamp is used to fasten the above-mentioned steel pipe cable, and the cable protector protects the cable.
上述的结构中，所述超声波液位检测仪还包括有备用超声波发射传感器和备用超声波接收传感器。In the above structure, the ultrasonic liquid level detector further includes a spare ultrasonic transmitting sensor and a spare ultrasonic receiving sensor.
本发明的有益效果在于：本发明的石油钻井超声波液位监控装置是利用超声波在不同介质下具有不同的传播速度的特性以及气体、液体、固体介质不同的穿透特性，对石油井下钻井液（俗称泥浆）液位进行监测，通过和石油内套管的螺纹连接，将超声波液位检测仪下至需要监测的井深，通过对地面控制信号，触发仪器中的超声波发射传感器，发出超声波信号，而在仪器的另一侧，设置同样频率的超声波接收传感器，接收相应的超声波信号；通过接收到的不同信号，从时间参数的不同和电压脉冲信号状态进行区分辨识，来判定井下该深度下到底是气体还是泥浆介质，从而可以指导地面上的操作人员进行相应的操作；根据设计井深、套管等因素，在地面以下十到五十米和两百到五百米分别设置两组超声波传感器，在起钻过程中，当检测到上下两组超声波传感器所处位置套管内均为气体时，则开始向管柱内灌注泥浆，当灌注时间超过一定时间，上部超声波传感器仍然不能检测到套管内的泥浆，说明出现井漏，可及时报警堵漏；当上部超声波传感器检测到套管内的泥浆时，则停止灌注；整个过程借助计算机实现自动控制。The beneficial effect of the present invention is that: the oil drilling ultrasonic liquid level monitoring device of the present invention utilizes the characteristics of ultrasonic waves having different propagation speeds in different media and the different penetration characteristics of gas, liquid, and solid media to control oil well drilling fluid ( Commonly known as mud) liquid level monitoring, through the threaded connection with the oil inner casing, the ultrasonic liquid level detector is lowered to the depth of the well to be monitored, and the ultrasonic emission sensor in the instrument is triggered by the ground control signal to send out ultrasonic signals, while On the other side of the instrument, an ultrasonic receiving sensor with the same frequency is installed to receive the corresponding ultrasonic signal; through the different received signals, distinguish and identify from the difference in time parameters and the state of the voltage pulse signal to determine whether the depth in the well is down. The gas is still a mud medium, which can guide the operators on the ground to carry out corresponding operations; according to the design well depth, casing and other factors, two sets of ultrasonic sensors are respectively set up at 10 to 50 meters and 200 to 500 meters below the ground. During the tripping process, when it is detected that the upper and lower sets of ultrasonic sensors are located in the casing and there is gas in the casing, the mud will be injected into the pipe string. When the injection time exceeds a certain period of time, the upper ultrasonic sensor still cannot detect the mud in the casing. , indicating that there is a well leakage, and the alarm can be reported in time to stop the leakage; when the upper ultrasonic sensor detects the mud in the casing, the injection will be stopped; the whole process is automatically controlled by the computer.
【附图说明】【Description of drawings】
图1为本发明的原理框图；Fig. 1 is a block diagram of the present invention;
图2为本发明的具体实施例图；Fig. 2 is the specific embodiment figure of the present invention;
图3为本发明的原理图。Fig. 3 is a schematic diagram of the present invention.
【具体实施方式】【Detailed ways】
下面结合附图和实施例对本发明作进一步的描述。The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
参照图1所示，本发明揭示的石油钻井超声波液位监控装置，该装置用于判定井下特定深度到底是气体还是泥浆介质，从而可以指导地面上的操作人员进行相应的操作。Referring to Figure 1, the present invention discloses an ultrasonic liquid level monitoring device for petroleum drilling, which is used to determine whether a specific depth in a well is gas or mud medium, so as to guide operators on the ground to perform corresponding operations.
具体的，参照图1至图3所示，本发明的石油钻进超声波液位检测装置包括地面控制装置和超声波液位检测仪，其中，地面控制装置包括供电电源10、数据采集器20、控制器30、显示器40以及触发器50，数据采集器20、触发器50以及显示器40均与控制器30电性连接；超声波液位检测仪90包括多组超声波发射传感器60和超声波接收传感器70，所述超声波发射传感器60和超声波接收传感器70均连接至数据采集器20上，所述触发器50电性连接至数据采集器20上，且该触发器50还连接至上述的超声波发射传感器60和超声波接收传感器70上，结合图2所示，超声波液位检测仪90上连接有钢管电缆901，钢管电缆901的另一端连接至供电电源10和数据采集器20上。供电电源10与所述的数据采集器20、触发器50、超声波发射传感器60、超声波接收传感器70均电性连接，用于提供所需的电能。超声波液位检测仪90还包括有备用超声波发射传感器和备用超声波接收传感器。Specifically, referring to FIGS. 1 to 3, the oil drilling ultrasonic liquid level detection device of the present invention includes a ground control device and an ultrasonic liquid level detector, wherein the ground control device includes a power supply 10, a data collector 20, a control Device 30, display 40 and trigger 50, data collector 20, trigger 50 and display 40 are all electrically connected to controller 30; ultrasonic liquid level detector 90 includes multiple groups of ultrasonic transmitting sensors 60 and ultrasonic receiving sensors 70, so The ultrasonic transmitting sensor 60 and the ultrasonic receiving sensor 70 are all connected to the data collector 20, the trigger 50 is electrically connected to the data collector 20, and the trigger 50 is also connected to the above-mentioned ultrasonic transmitting sensor 60 and the ultrasonic On the receiving sensor 70 , as shown in FIG. 2 , a steel pipe cable 901 is connected to the ultrasonic liquid level detector 90 , and the other end of the steel pipe cable 901 is connected to the power supply 10 and the data collector 20 . The power supply 10 is electrically connected to the data collector 20 , the trigger 50 , the ultrasonic transmitting sensor 60 and the ultrasonic receiving sensor 70 to provide the required electric energy. The ultrasonic liquid level detector 90 also includes a spare ultrasonic transmitting sensor and a spare ultrasonic receiving sensor.
结合图2所示，即为本发明的一具体实施例，在本实施例中，超声波液位检测仪90的上端连接于内套管902上，下端连接于接箍903上，且接箍903的下端则与另一节内套管902相连接，通过这种方式将多个超声波液位检测仪90连接起来。超声波液位检测仪90还包括支撑座套和超声波发射接收集成电路板（图中未标示），超声波发射传感器60和超声波接收传感器70相对的设置于支撑套座的两侧，支撑套座具有与内套管相连通的异形槽，所述超声波发射传感器60和超声波接收传感器70均电性连接在超声波发射接收集成电路板上；内套管902的外表面上安装有电缆卡箍904和电缆保护器905，所述电缆卡箍904用于紧固上述的钢管电缆901，电缆保护器905对电缆起来保护作用。As shown in Figure 2, it is a specific embodiment of the present invention. In this embodiment, the upper end of the ultrasonic liquid level detector 90 is connected to the inner sleeve 902, and the lower end is connected to the collar 903, and the collar 903 The lower end of the tube is connected with another inner casing 902, and multiple ultrasonic liquid level detectors 90 are connected in this way. The ultrasonic liquid level detector 90 also includes a support seat cover and an ultrasonic transmitting and receiving integrated circuit board (not shown in the figure). The ultrasonic transmitting sensor 60 and the ultrasonic receiving sensor 70 are arranged on both sides of the supporting sleeve oppositely. A special-shaped slot connected to the inner sleeve, the ultrasonic transmitting sensor 60 and the ultrasonic receiving sensor 70 are electrically connected to the ultrasonic transmitting and receiving integrated circuit board; the outer surface of the inner sleeve 902 is equipped with a cable clamp 904 and a cable protection 905, the cable clamp 904 is used to fasten the above-mentioned steel pipe cable 901, and the cable protector 905 protects the cable.
下面结合图3所示，我们对本发明的石油钻井超声波液位监控装置的工作过程及原理进行详细的描述，根据声波的斯奈尔定律：超声波斜入射到界面时，其产生的反射波、折射波和入射波的角度之间存在下列关系（反射折射定律）：sinα/ C1=sinβ/C2。其中α为第一种介质的入射角，β为第二种介质的折射角。C1为第一种介质的传播速率，C2为第二种介质的传播速率。Below in conjunction with Fig. 3, we describe in detail the working process and principle of the oil drilling ultrasonic liquid level monitoring device of the present invention, according to the Snell's law of sound waves: when ultrasonic waves obliquely incident on the interface, the reflected waves, refractions and The following relationship exists between the angle of the wave and the incident wave (the law of catadioptric refraction): sinα/C 1 =sinβ/C 2 . Where α is the angle of incidence of the first medium, and β is the angle of refraction of the second medium. C1 is the propagation velocity of the first medium and C2 is the propagation velocity of the second medium.
根据附图3中的井下超声波液位检测的原理，我们可以确定的是超声波发射的入射角α，而C1为超声波在金属套管材质中的横波传播速率；C2为超声波在泥浆（或空气）中的传播速率。以上参数都可以确定，因此我们可以计算出β值，即超声波经过钢质套管折射后进入泥浆（或空气）介质的折射角。According to the principle of downhole ultrasonic liquid level detection in Figure 3, we can determine the incident angle α of ultrasonic emission, and C 1 is the shear wave propagation rate of ultrasonic in the metal casing material; C 2 is the ultrasonic wave in mud (or speed of transmission in air). The above parameters can be determined, so we can calculate the β value, that is, the refraction angle of the ultrasonic wave entering the mud (or air) medium after being refracted by the steel casing.
路径1，超声波发射传感器至超声波接收传感器1，为套管内无钻杆有泥浆超声波的传递情形。Path 1, from the ultrasonic transmitting sensor to the ultrasonic receiving sensor 1, is the transmission of ultrasonic waves in mud without drill pipe in the casing.
路径2，超声波发射传感器至超声波接收传感器2，为套管内有钻杆有泥浆的情形。Path 2, from the ultrasonic transmitting sensor to the ultrasonic receiving sensor 2, is the case where there is drill pipe and mud in the casing.
当套管内无泥浆时，由于高频超声波在空气中的迅速衰减，超声波接收传感器1和接收传感器2都接收不到信号。When there is no mud in the casing, due to the rapid attenuation of high-frequency ultrasonic waves in the air, neither the ultrasonic receiving sensor 1 nor the receiving sensor 2 can receive signals.
利用超声波的在不同介质下具有不同的传播速度的特性以及气体、液体、固体介质不同的穿透特性，可以进行对石油井下钻井液和空气介质进行判定，从而对特定监控点是否为泥浆液位还是空气介质进行判定，从而达到液位监控的目的。本发明通过接收到的不同信号，从时间参数的不同和电压脉冲信号状态进行区分辨识，来判定井下该深度下到底是气体还是泥浆介质，从而可以指导地面上的操作人员进行相应的操作。Utilizing the characteristics of ultrasonic waves with different propagation speeds in different media and the different penetration characteristics of gas, liquid, and solid media, it is possible to judge the drilling fluid and air media in the oil well, so as to determine whether the specific monitoring point is the mud level It is still the air medium to judge, so as to achieve the purpose of liquid level monitoring. The present invention distinguishes and recognizes different received signals from different time parameters and voltage pulse signal states to determine whether it is gas or mud medium at the depth in the well, so as to guide operators on the ground to perform corresponding operations.
以上所描述的仅为本发明的较佳实施例，上述具体实施例不是对本发明的限制。在本发明的技术思想范畴内，可以出现各种变形及修改，凡本领域的普通技术人员根据以上描述所做的润饰、修改或等同替换，均属于本发明所保护的范围。The above descriptions are only preferred embodiments of the present invention, and the above specific embodiments do not limit the present invention. Within the scope of the technical idea of the present invention, various deformations and modifications may occur, and any retouching, modification or equivalent replacement made by those skilled in the art based on the above description shall fall within the protection scope of the present invention.
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| CN108487901A (en) * | 2018-05-23 | 2018-09-04 | 大庆市亿动科技有限公司 | Oil well multi-functional automatic liquid level monitor based on velocity of sound sensor |
| CN111577249B (en) * | 2020-04-28 | 2023-05-30 | 中国石油大学(华东) | A multi-sensor layout downhole drill string running attitude measuring instrument |
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