CN112855117A - High-durability and readable-back wireless radio frequency downhole multilayer test pipe column - Google Patents
High-durability and readable-back wireless radio frequency downhole multilayer test pipe column Download PDFInfo
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- CN112855117A CN112855117A CN202110047643.1A CN202110047643A CN112855117A CN 112855117 A CN112855117 A CN 112855117A CN 202110047643 A CN202110047643 A CN 202110047643A CN 112855117 A CN112855117 A CN 112855117A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
Abstract
The invention relates to the technical field of underground multilayer testing, in particular to a high-durability read-back wireless radio frequency underground multilayer testing pipe column. This tubular column includes: the device comprises a packer, an intelligent switch valve, a radio frequency tag collector and a readback instrument; the packer and the intelligent switch valve are connected to form a pressure testing unit, and the number of the pressure testing units is matched with the number of the stratums in the oil reservoir; the intelligent switch valve comprises a power supply assembly, a measurement and control power assembly and a switch valve port; the measurement and control power assembly comprises a control unit, a wireless communication unit, a motor driving unit, a boosting unit, a transmission unit, a magnetic switch and a temperature and pressure measuring unit; the high-durability read-back wireless radio frequency downhole multilayer test pipe column provided by the invention can improve the operation efficiency and reduce the operation safety risk; the service life of the battery pack is greatly prolonged, and the reliability and durability of the test pipe column are improved; and the underground state can be mastered in real time, and the production safety and efficiency are ensured.
Description
Technical Field
The invention relates to the technical field of underground multilayer testing, in particular to a high-durability read-back wireless radio frequency underground multilayer testing pipe column.
Background
At present, a lifting or releasing type or pressure-controlled type tester is adopted for formation testing to realize multiple well opening and closing, and a pipe column can only test a single layer once. If the same well needs to be tested in a multilayer flowing mode to obtain production, the tubular column needs to be pulled down for multiple times to carry out the test layer by layer and single clamp to obtain the production, and the problems of long construction period, high cost, low efficiency and the like exist. Therefore, the downhole needs to be subjected to layered testing and layered control. The current underground layered testing technology mainly comprises a cable ground direct reading technology and an underground storage type testing technology. The cabled ground direct-reading technology has the problems of high safety risk, short testing time, inaccurate testing data and the like, so the underground storage type testing technology is the most widely applied layered testing technology method in the prior art.
The underground storage type testing technology achieves the purpose of layer control by putting and testing a testing pipe column with a plurality of stages of packers underground, most of intelligent switches adopted by the existing underground storage type testing pipe column are triggered at regular time, namely, the opening action time of the intelligent switches is set according to the putting required time, and the closing action time is set according to the working time, so that the underground switching action is completed. By adopting the mode, the leading action of the pipe column is difficult to ensure, when the underground condition changes, the underground parameter change cannot be obtained in time, and the pipe column cannot be adjusted; the test pipe column can only be salvaged and the internal data can be read and analyzed. The problem that the tubular column cannot be flexibly regulated and controlled underground can be solved by adopting a wireless radio frequency method. By putting the radio frequency tags, all intelligent switches of the stratum can be controlled in real time, and the intelligent switches of different stratums have different address codes, so that signal mistransmission cannot occur. However, the existing partial pressure measurement process pipe column based on the radio frequency identification communication technology has the defects of high energy consumption of a power supply unit and short standby time because an intelligent switch is always in a communicable state, and meanwhile, data stored underground can only be read after being salvaged, the underground parameter change cannot be obtained in real time, and once the underground abnormity occurs, the abnormal condition in the underground can be checked by throwing and salvaging for many times.
Disclosure of Invention
Technical problem to be solved
The invention provides a high-durability read-back wireless radio frequency downhole multilayer test tubular column, which overcomes the defects that a partial pressure differential measurement process tubular column power supply unit based on a wireless radio frequency identification communication technology in the prior art is large in energy consumption, short in standby time, incapable of obtaining downhole parameter changes in real time, incapable of mastering downhole abnormity in real time and the like.
(II) technical scheme
In order to solve the above problems, the present invention provides a high-durability readable wireless rf downhole multilayer testing string, comprising:
the device comprises a packer, an intelligent switch valve, a radio frequency tag collector and a readback instrument;
the packer and the intelligent switch valve are connected to form a pressure testing unit, and the number of the pressure testing units is matched with the number of the stratums in the oil reservoir;
the intelligent switch valve comprises a power supply assembly, a measurement and control power assembly and a switch valve port;
the power supply assembly is internally provided with a high-temperature battery pack and a power supply management module and supplies power to the underground electric control system;
the measurement and control power assembly comprises a control unit, a wireless communication unit, a motor driving unit, a boosting unit, a transmission unit, a magnetic switch and a temperature and pressure measuring unit;
the radio frequency tag is connected with a wireless communication unit in the measurement and control power assembly through an electric signal, and controls the action of each layer of intelligent switch valve after the radio frequency tag is put in a wellhead; after receiving the signal of the radio frequency tag, the wireless communication unit transmits the instruction to the control unit, the control unit drives the motor driving unit to output torque, the torque is lifted by the force increasing unit and then is converted into rotation and translation through the transmission unit, and the opening degree of a valve port of the switch valve is adjusted;
the wireless communication unit can receive the instruction signal of the radio frequency tag and can transmit a data signal containing underground test data to the readback instrument; the signals transmitted by the wireless communication unit all comprise address codes of all layers;
the activator is thrown underground at a wellhead, and when the activator is close to the intelligent switch valve, the activator can close the magnetic switch which is initially in an off state through the action of a magnetic field generated between the activator and the magnetic switch, and can wake up all components in the intelligent switch valve from a standby state to be in a working state;
the radio frequency tag collector is arranged at the bottom of the underground multilayer test pipe column and used for collecting radio frequency tags;
the temperature and pressure measuring unit measures and stores the pressure in the pipe, the pressure outside the pipe and the downhole temperature parameter;
the readback instrument is connected with the cable car through a cable and can be thrown to any depth underground along with the cable; including the radio frequency signal receiving element in the readback appearance, when the readback appearance is close to the intelligent ooff valve that is in operating condition, the radio communication unit in readback appearance and the intelligent ooff valve passes through signal connection, and the measured data in the intelligent ooff valve passes through radio frequency signal transmission and gives the readback appearance to transmit to ground by the cable.
Preferably, the activator comprises a lower joint, a magnetic core, a balancing weight and an upper joint, two ends of the magnetic core are installed in central holes of the lower joint and the balancing weight, and the lower joint is connected with the balancing weight through threads; when the magnetic core is close to the intelligent switch valve, the magnetic switch in the intelligent switch valve is closed under the action of an external magnetic field, and the intelligent switch valve is awakened from a standby state.
Preferably, when the intelligent switch valve does not receive the instruction signal of the radio frequency tag within the preset time, the control unit switches off the magnetic switch;
the magnetic switch is connected in series with the passage of the wireless communication unit, the motor driving unit, the boosting unit and the transmission unit, when the magnetic switch is switched off, all the units lose power supply, only the temperature and pressure measuring unit keeps continuous working, and the testing pipe column enters a low-power standby state.
Preferably, the reader-writer comprises a cable connector, a wireless receiving unit and an antenna shield, wherein one end of the cable is connected into the cable connector, the cable connector is connected with the wireless receiving unit through threads, the other end of the wireless receiving unit is connected with the antenna shield through threads, the reader-writer is usually hung and thrown into the underground through the cable, and after the reader-writer is close to the intelligent switch valve, the wireless receiving unit in the reader-writer starts to receive data signals sent by the wireless communication unit and is transmitted to the ground through the cable connector for data analysis.
And the data of different strata are read by moving to different positions, and the data transmitted by each stratum comprises respective address codes.
Preferably, the valve port of the switch valve adopts a mechanical axial movement valve port to perform the switching of the liquid inlet, and one end of the switch valve port is connected with the measurement and control assembly in a threaded mode.
Preferably, after the test is finished, the whole underground multi-layer test pipe column is salvaged to the ground, the radio frequency tag and the activator in the radio frequency tag collector are taken out, the data stored in each layer are read for analysis, and the underground environment is evaluated.
(III) advantageous effects
The high-durability read-back wireless radio frequency downhole multilayer test pipe column provided by the invention can improve the operation efficiency and reduce the operation safety risk by adopting a wireless radio frequency communication mode; the intelligent switch valve is dormant and activated on the premise of ensuring normal communication, so that the service life of the battery pack is greatly prolonged, and the reliability and durability of the test pipe column are improved; the communication of intelligent switch valve and readback appearance can read the test parameter in the pit under the circumstances of not salvaging the test tubular column, can master the state in the pit in real time, ensures production safety and efficiency.
Drawings
FIG. 1 is a schematic diagram of an overall structure of a high durability readable wireless RF downhole multilayer test string according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an embodiment of the invention illustrating a structure of an intelligent switch valve in a high-durability readable wireless RF downhole multilayer test string;
FIG. 3 is a schematic diagram of an activator in a high endurance, readable-back, radio frequency downhole multi-layer test string in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of a high durability readable-back RF downhole multi-layer test string incorporating a reader according to embodiments of the present invention.
In the figure:
1: a packer; 2: an intelligent switch valve; 3: a radio frequency tag collector; 4: a valve port of the switch valve; 5: a transmission unit; 6: a motor drive unit; 7: a wireless communication unit; 8: a magnetic switch; 9: a control unit; 10: a lower joint; 11: a magnetic core; 12: a balancing weight; 13: an upper joint; 14: a cable joint; 15: a wireless receiving unit; 16: an antenna shield.
Detailed Description
The present invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 1-4, the present invention provides a high durability readable-back wireless rf downhole multilayer test string, comprising: the device comprises a packer 1, an intelligent switch valve 2, a radio frequency tag collector 3 and a readback instrument;
the packer 1 and the intelligent switch valve 2 are connected to form a pressure testing unit, and the number of the pressure testing units is matched with the number of strata in the oil reservoir;
the intelligent switch valve 2 comprises a power supply assembly, a measurement and control power assembly and a switch valve port 4;
the power supply assembly is internally provided with a high-temperature battery pack and a power supply management module and supplies power to the underground electric control system;
the measurement and control power assembly comprises a control unit 9, a wireless communication unit 7, a motor driving unit 6, a boosting unit, a transmission unit 5, a magnetic switch 8 and a temperature and pressure measuring unit;
the radio frequency tag is connected with a wireless communication unit 7 in the measurement and control power assembly through an electric signal, and controls the action of each layer of intelligent switch valve 2 after the radio frequency tag is put in a wellhead, an exclusive address code is independently arranged in each layer of intelligent switch valve 2, and the intelligent switch valve 2 in each layer only receives an instruction signal which is the same as the address code of the layer; after receiving the signal of the radio frequency tag, the wireless communication unit 7 transmits the instruction to the control unit 9, the control unit 9 drives the motor driving unit 6 to output torque, the torque is lifted by the force increasing unit and then is converted into rotation and translation through the transmission unit, and the opening degree of a valve port of the switch valve is adjusted;
the wireless communication unit 7 can receive the instruction signal of the radio frequency tag and can transmit a data signal containing downhole test data to the readback instrument; the signals transmitted by the wireless communication unit 7 each include an address code of each layer;
the activator is thrown underground at a wellhead, and when the activator is close to the intelligent switch valve, the activator can close the magnetic switch which is initially in an off state through the action of a magnetic field generated between the activator and the magnetic switch, and can wake up all components in the intelligent switch valve from a standby state to be in a working state;
the radio frequency tag collector is arranged at the bottom of the underground multilayer test pipe column and used for collecting radio frequency tags;
the temperature and pressure measuring unit measures and stores the pressure in the pipe, the pressure outside the pipe and the downhole temperature parameter;
the readback instrument is connected with the cable car through a cable and can be thrown to any depth underground along with the cable; including the radio frequency signal receiving element in the readback appearance, when the readback appearance is close to the intelligent ooff valve that is in operating condition, the radio communication unit in readback appearance and the intelligent ooff valve passes through signal connection, and the measured data in the intelligent ooff valve passes through radio frequency signal transmission and gives the readback appearance to transmit to ground by the cable.
The activator comprises a lower joint, a magnetic core, a balancing weight and an upper joint, wherein two ends of the magnetic core are arranged in central holes of the lower joint and the balancing weight, and the lower joint is in threaded connection with the balancing weight; when the magnetic core is close to the intelligent switch valve, the magnetic switch in the intelligent switch valve is closed under the action of an external magnetic field, and the intelligent switch valve is awakened from a standby state.
When the intelligent switch valve does not receive the instruction signal of the radio frequency tag within the preset time, the control unit disconnects the magnetic switch;
the magnetic switch 8 is connected in series with the wireless communication unit 7, the motor driving unit 6, the boosting unit and the transmission unit 5, when the magnetic switch 8 is switched off, all the units lose power supply, only the temperature and pressure measuring unit keeps continuous operation, and the test string enters a low-power standby state.
The reading-back instrument comprises a cable joint 14, a wireless receiving unit 15 and an antenna shield 16, one end of a cable is connected into the cable joint 14, the cable joint 14 is connected with the wireless receiving unit 15 through threads, the other end of the wireless receiving unit 15 is connected with the reading-back instrument through threads, the reading-back instrument is usually hung and thrown underground through the cable, after the reading-back instrument is close to the intelligent switch valve, the wireless receiving unit in the reading-back instrument starts to receive data signals sent by the wireless communication unit, and the data signals are transmitted to the ground through the cable joint for data analysis.
And the data of different strata are read by moving to different positions, and the data transmitted by each stratum comprises respective address codes.
The switching valve port 4 adopts a mechanical axial movement valve port to perform switching of the liquid inlet, and one end of the switching valve port is connected with the measurement and control assembly in a threaded mode.
After the test is finished, the whole underground multilayer test pipe column is salvaged to the ground, the radio frequency tags and the activators in the radio frequency tag collector are taken out, the data stored in each layer are read for analysis, and the underground environment is evaluated.
The specific structure of the high-durability readable-back wireless radio frequency downhole multilayer test string is described in detail as follows:
the method comprises the following steps: the packer 1, the intelligent switch valve 2 and the radio frequency tag collector 3 form a downhole multilayer test pipe column;
the packer 1 and the intelligent switch valve 2 are connected to form a pressure testing unit, the pressure testing units with the number equal to that of the strata are connected according to the number of the strata in the oil reservoir, and the radio frequency tag collector 3 is arranged at the bottom of the underground multilayer testing pipe column;
the activator comprises lower clutch 10, magnetic core 11, balancing weight 12, top connection 13, and the central hole of bottom clutch 10 and balancing weight 12 is installed at magnetic core 11 both ends, and top connection 13 passes through threaded connection with balancing weight 12. After the assembly is completed, the activator is put into from the wellhead, the upper joint 13 and the lower joint 10 can protect the magnetic core 11 from being damaged in the putting process, and the balancing weight 12 can ensure that the activator smoothly descends to the specified depth. When the magnetic core 11 is close to the intelligent switch valve 3, the magnetic switch 8 in the intelligent switch valve 3 is closed under the action of an external magnetic field, and the intelligent switch valve 3 is awakened from a standby state;
the intelligent switch valve 3 comprises a switch valve port 4; a transmission unit 5; a motor drive unit 6; a wireless communication unit 7; a magnetic switch 8; a control unit 9.
When the throwing is finished, the magnetic switch 8 is in a disconnected state, and the transmission unit 5, the motor driving unit 6 and the wireless communication unit 7 are in a power-off state, so that the respective functions cannot be finished. The magnetic core 11 in the activator can close the magnetic switch 8 in the intelligent switch valve 3, so that the transmission unit 5, the motor driving unit 6 and the wireless communication unit 7 recover functions;
and then, the wellhead puts in radio frequency tags to control the actions of the intelligent switch valves, the wireless communication unit 7 transmits instructions to the control unit 9 after receiving signals of the radio frequency tags, and the control unit 9 drives the motor driving unit 6 and the transmission unit 5 to adjust the opening of the valve port 4 of the switch valve. After the adjustment is finished, if no further action is performed within a period of time, the magnetic switch 8 is switched off again, so that the intelligent switch valve 3 enters a standby state;
the reader consists of a cable connector 14, a wireless receiving unit 15 and an antenna shield 16, wherein one end of a cable is connected into the cable connector 14, the cable connector 14 is connected with the wireless receiving unit 15 through threads, and the other end of the wireless receiving unit 15 is connected with the antenna shield 16 through threads. Before the reader is put in, an activator needs to be put in first to enable the intelligent switch valve 3 to be in a starting state. The reader is usually hung and thrown into the well by a cable, when the reader is close to the intelligent switch valve 3, the internal wireless receiving unit 15 starts to receive the data signal sent by the wireless communication unit 7, and the data signal is transmitted to the ground by the cable joint 14 through the cable for data analysis. The data of different stratums are read by moving to different positions, and the data transmitted by each stratum comprises respective address codes, so that the data cannot be misread.
After the test is finished, the whole underground multilayer test pipe column is salvaged to the ground, the radio frequency tags and the activators in the radio frequency tag collector are taken out, the data stored in each layer are read for analysis, and the underground environment is evaluated.
The high-durability read-back wireless radio frequency downhole multilayer test pipe column provided by the embodiment of the invention adopts a multi-stage packer and intelligent switch valve structure to ensure that the pipe column can effectively play a role in downhole environments with different formation quantities, and when the downhole condition is stable and the intelligent switch valve is not required to be adjusted, the intelligent switch valve can automatically enter a standby (low-power) state and only maintains the continuous work of a downhole temperature and pressure measuring unit. When the state of the intelligent switch valve needs to be further adjusted, an activator needs to be put into the intelligent switch valve from the wellhead, and the wireless communication unit in the intelligent switch valve is activated again, so that the intelligent switch valve can smoothly receive the instruction of the radio frequency tag; in addition, the reading of underground storage parameters can be realized by putting the readback instrument from the wellhead to the well under the condition that the pipe column does not need to be pulled out, the advantages of a cable direct-reading testing method and an underground storage type testing method are combined, the reliability and the service life of the underground multilayer testing pipe column are further improved, the data acquisition timeliness rate of underground pressure, temperature and the like is improved, and effective guidance is provided for timely judging a testing system.
The above embodiments are only for illustrating the invention and are not to be construed as limiting the invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention, therefore, all equivalent technical solutions also belong to the scope of the invention, and the scope of the invention is defined by the claims.
Claims (6)
1. A high durability readable wireless radio frequency downhole multilayer test string, comprising: the device comprises a packer, an intelligent switch valve, a radio frequency tag collector and a readback instrument;
the packer and the intelligent switch valve are connected to form a pressure testing unit, and the number of the pressure testing units is matched with the number of the stratums in the oil reservoir;
the intelligent switch valve comprises a power supply assembly, a measurement and control power assembly and a switch valve port;
the power supply assembly is internally provided with a high-temperature battery pack and a power supply management module and supplies power to the underground electric control system;
the measurement and control power assembly comprises a control unit, a wireless communication unit, a motor driving unit, a boosting unit, a transmission unit, a magnetic switch and a temperature and pressure measuring unit;
the radio frequency tag is connected with a wireless communication unit in the measurement and control power assembly through an electric signal, and controls the action of each layer of intelligent switch valve after the radio frequency tag is put in a wellhead; after receiving the signal of the radio frequency tag, the wireless communication unit transmits the instruction to the control unit, the control unit drives the motor driving unit to output torque, the torque is lifted by the force increasing unit and then is converted into rotation and translation through the transmission unit, and the opening degree of a valve port of the switch valve is adjusted;
the wireless communication unit can receive the instruction signal of the radio frequency tag and can transmit a data signal containing underground test data to the readback instrument; the signals transmitted by the wireless communication unit all comprise address codes of all layers;
the activator is thrown underground at a wellhead, and when the activator is close to the intelligent switch valve, the activator can close the magnetic switch which is initially in an off state through the action of a magnetic field generated between the activator and the magnetic switch, and can wake up all components in the intelligent switch valve from a standby state to be in a working state;
the radio frequency tag collector is arranged at the bottom of the underground multilayer test pipe column and used for collecting radio frequency tags;
the temperature and pressure measuring unit measures and stores the pressure in the pipe, the pressure outside the pipe and the downhole temperature parameter;
the readback instrument is connected with the cable car through a cable and can be thrown to any depth underground along with the cable; including the radio frequency signal receiving element in the readback appearance, when the readback appearance is close to the intelligent ooff valve that is in operating condition, the radio communication unit in readback appearance and the intelligent ooff valve passes through signal connection, and the measured data in the intelligent ooff valve passes through radio frequency signal transmission and gives the readback appearance to transmit to ground by the cable.
2. The high durability readable-back radio frequency downhole multilayer test string according to claim 1, wherein the activator comprises a lower joint, a magnetic core, a counterweight and an upper joint, two ends of the magnetic core are installed in central holes of the lower joint and the counterweight, and the lower joint and the counterweight are connected through threads; when the magnetic core is close to the intelligent switch valve, the magnetic switch in the intelligent switch valve is closed under the action of an external magnetic field, and the intelligent switch valve is awakened from a standby state.
3. The high-durability readable-back wireless radio frequency downhole multilayer test string according to claim 1, wherein the control unit turns off the magnetic switch when the intelligent switch valve does not receive the command signal of the radio frequency tag within a preset time;
the magnetic switch is connected in series with the passage of the wireless communication unit, the motor driving unit, the boosting unit and the transmission unit, when the magnetic switch is switched off, all the units lose power supply, only the temperature and pressure measuring unit keeps continuous working, and the testing pipe column enters a low-power standby state.
4. The high-durability readable-back radio frequency downhole multilayer test string according to claim 1, wherein the reader comprises a cable joint, a wireless receiving unit and an antenna shield, one end of a cable is connected in the cable joint, the cable joint is in threaded connection with the wireless receiving unit, the other end of the wireless receiving unit is in threaded connection with the antenna shield, the reader is usually hung and thrown into the downhole by the cable, and after the reader approaches the intelligent switch valve, the wireless receiving unit inside the reader starts to receive data signals sent by the wireless communication unit and is transmitted to the ground through the cable joint for data analysis.
And the data of different strata are read by moving to different positions, and the data transmitted by each stratum comprises respective address codes.
5. The high-durability read-back wireless radio frequency downhole multilayer test string according to claim 1, wherein the switch valve port adopts a mechanical axial movement valve port to perform the on-off switching of the liquid inlet, and one end of the switch valve port is connected with the measurement and control assembly in a threaded manner.
6. The high-durability readable-back wireless radio frequency downhole multilayer test string according to claim 1, wherein after the test is finished, the whole downhole multilayer test string is salvaged to the ground, the radio frequency tag and the activator in the radio frequency tag collector are taken out, the data stored in each layer are read for analysis, and the downhole environment is evaluated.
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| CN202110047643.1A CN112855117A (en) | 2021-01-14 | 2021-01-14 | High-durability and readable-back wireless radio frequency downhole multilayer test pipe column |
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| CN202110047643.1A CN112855117A (en) | 2021-01-14 | 2021-01-14 | High-durability and readable-back wireless radio frequency downhole multilayer test pipe column |
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Cited By (1)
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| CN117686167A (en) * | 2024-01-29 | 2024-03-12 | 深蓝(天津)智能制造有限责任公司 | Pressure monitoring and early warning method and system for underground electric control isolation valve |
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| US20170328155A1 (en) * | 2015-01-13 | 2017-11-16 | Halliburton Energy Services, Inc. | Mechanical Downhole Pressure Maintenance System |
| US20200141211A1 (en) * | 2017-05-25 | 2020-05-07 | Weatherford Technology Holdings, Llc | Pressure Integrity Testing of One-Trip Completion Assembly |
| CN109057750A (en) * | 2018-08-13 | 2018-12-21 | 哈尔滨艾拓普科技有限公司 | A kind of split type downhole intelligent sliding sleeve switch |
| US20200240265A1 (en) * | 2019-01-28 | 2020-07-30 | Saudi Arabian Oil Company | Straddle Packer Testing System |
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| CN110080738A (en) * | 2019-05-06 | 2019-08-02 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Dividing based on the radio frequency identification communication technology surveys process pipe string and method |
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