A continuous tubing well load measuring tool and measuring system

Abstract

The application provides a continuous pipe downhole load measuring tool and a measuring system. The continuous pipe downhole load measuring tool comprises a measuring tool body, a fiber sensing array, a sealing protection sleeve, a lower joint, a steel pipe fiber cable and a communication fiber. A measuring ring groove is arranged on the outer side wall of the middle part of the measuring tool body, the fiber sensing array is arranged in the measuring ring groove, the sealing protection sleeve is sleeved on the outer side wall of the middle part of the measuring tool body and covers the measuring ring groove, the lower joint is sleeved on the outer side wall of the bottom of the measuring tool body, the communication fiber penetrates the top end of the measuring tool body and is connected with the fiber sensing array, the steel pipe fiber cable is sleeved on the outside of the communication fiber, and the steel pipe fiber cable is located at the top end of the measuring tool body. The wavelength change reflected by the fiber sensing array reflects the strain change of the measured object, and the real-time measurement of the load borne by the downhole drilling tool in the continuous pipe operation process is realized, which is safer and more reliable.

Description

Technical Field

[0001] This invention relates to the field of coiled tubing operation technology, and more particularly to a coiled tubing downhole load measurement tool and system. Background Technology

[0002] Coiled tubing downhole operations have become one of the important means to extend the life of oil and gas wells and increase production. Using coiled tubing equipment is usually faster and more economical than using conventional workover equipment. Coiled tubing can also transport downhole tools or fluids to non-vertical wells or multi-branch horizontal wells.

[0003] With the large-scale development of unconventional oil and gas resources, coiled tubing downhole operations are moving towards deeper and longer horizontal sections, facing challenges such as complex and diverse downhole conditions, frequent unforeseen events, and high operational risks. Decision-makers urgently need a safe and reliable coiled tubing downhole measurement tool to accurately feed downhole operation parameters back to the surface, thereby adjusting construction parameters in a timely manner, reducing accident complexity, lowering operational risks, extending tool life, and ultimately improving operational efficiency and reducing operational costs.

[0004] Currently known real-time load measurement tools for coiled tubing downhole typically use resistance strain gauges arranged in a Wheatstone bridge to measure the load on the downhole tool, as illustrated in patent CN201920191847.0 - Coiled Tubing Downhole Load Measurement Device. Measurement data is then transmitted to a surface system via cable, as illustrated in CN201611034860.2 - A Coiled Tubing Drilling Measurement-while-Drilling Tool. These methods have the following significant drawbacks: First, the measurement tool requires external power, with the surface control system supplying high-voltage electricity to the downhole tool, posing a high risk to electrical safety. Second, the measurement tool requires data preprocessing downhole, as it contains electrical modules for signal acquisition, processing, and transmission. Increased downhole ambient temperature reduces the reliability of electronic components, limiting the tool's application in high-temperature downhole environments. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a load measurement tool and system for continuous tubing wells, addressing the shortcomings of the prior art.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A continuous tubing well download measurement tool includes: a measurement tool body, an optical fiber sensor array, a sealing protective sleeve, a lower connector, a steel pipe optical fiber cable, and a communication optical fiber. A measurement ring groove is provided on the middle outer wall of the measurement tool body. The optical fiber sensor array is installed in the measurement ring groove. The sealing protective sleeve is fitted on the middle outer wall of the measurement tool body and covers the measurement ring groove. The lower connector is fitted on the bottom outer wall of the measurement tool body. The communication optical fiber passes through the top of the measurement tool body and is connected to the optical fiber sensor array. The steel pipe optical fiber cable is fitted on the outside of the communication optical fiber and is located at the top of the measurement tool body.

[0007] The beneficial effects of adopting the technical solution of this invention are as follows: the wavelength change reflected back by the fiber optic sensor array reflects the strain change of the measured object, realizing real-time measurement of the load on the downhole drilling tool during coiled tubing operation. The load parameters are measured and transmitted using light as a medium. The downhole part does not require high-voltage power supply from the ground, making coiled tubing operation safer. The fiber optic sensor array measures the micro-strain on the main body of the drilling tool, and the measurement data is uploaded to the ground system at high speed through the fiber optic cable built into the coiled tubing. The measuring tool does not use electronic components, has a simple structure, is suitable for operation in high-temperature downhole environments, and has high reliability.

[0008] Further, the fiber optic sensing array includes: a first fiber optic strain gauge for measuring axial tensile and compressive loads, a second fiber optic strain gauge for measuring axial tensile and compressive loads, a third fiber optic strain gauge for measuring axial tensile and compressive loads, a fourth fiber optic strain gauge for measuring axial tensile and compressive loads, a fifth fiber optic strain gauge for measuring torque loads, a sixth fiber optic strain gauge for measuring torque loads, a seventh fiber optic strain gauge for measuring torque loads, and an eighth fiber optic strain gauge for measuring torque loads. The first fiber optic strain gauge, the second fiber optic strain gauge, the third fiber optic strain gauge, the fourth fiber optic strain gauge, the fifth fiber optic strain gauge, and the... The sixth, seventh, and eighth fiber optic strain gauges are all installed in the measuring ring groove. The communication fiber is connected to the first fiber optic strain gauge, the first fiber optic strain gauge is connected to the second fiber optic strain gauge, the second fiber optic strain gauge is connected to the sixth fiber optic strain gauge, the sixth fiber optic strain gauge is connected to the fifth fiber optic strain gauge, the fifth fiber optic strain gauge is connected to the third fiber optic strain gauge, the third fiber optic strain gauge is connected to the fourth fiber optic strain gauge, the fourth fiber optic strain gauge is connected to the eighth fiber optic strain gauge, and the eighth fiber optic strain gauge is connected to the seventh fiber optic strain gauge.

[0009] Furthermore, the first and third fiber optic strain gauges are arranged parallel to the axis of the measuring tool body, the second and fourth fiber optic strain gauges are arranged perpendicular to the axis of the measuring tool body, the fifth and seventh fiber optic strain gauges are arranged at an angle of -45 degrees to the axis of the measuring tool body, and the sixth and eighth fiber optic strain gauges are arranged at an angle of +45 degrees to the axis of the measuring tool body.

[0010] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the first to fourth fiber optic strain gauges for measuring axial tensile and compressive loads are arranged in the axial and perpendicular positions, and the fifth to sixth fiber optic strain gauges for measuring torque loads are arranged in the ±45° direction. This arrangement can achieve low coupling measurement of the two loads. The ground system performs load calibration and measurement on the measuring tool according to the Wheatstone bridge principle.

[0011] Furthermore, the first fiber strain gauge is located above the second fiber strain gauge, the fifth fiber strain gauge is located above the sixth fiber strain gauge, the third fiber strain gauge is located above the fourth fiber strain gauge, and the seventh fiber strain gauge is located above the eighth fiber strain gauge.

[0012] The beneficial effect of adopting the above-mentioned further technical solution is that multiple fiber optic strain gauges are used to measure axial tensile and compressive loads and torque loads at different positions, thereby improving measurement accuracy.

[0013] Furthermore, the first, second, third, fourth, fifth, sixth, seventh, and eighth fiber strain gauges are all Bragg grating strain gauges, and the Bragg wavelength ranges of the first, second, third, fourth, fifth, sixth, seventh, and eighth fiber strain gauges are at least 5 nm apart.

[0014] The beneficial effects of adopting the above-mentioned further technical solution are: the Bragg wavelength ranges of the fiber optic strain gauges in the fiber optic sensing array are maintained at least 5nm apart, so that the ground can accurately identify the strain measurement data. Since each fiber optic strain gauge has a different wavelength range, the ground data acquisition system can accurately identify the measurement values ​​corresponding to the cascaded fiber optic strain gauges.

[0015] Furthermore, the fiber optic sensing array is wrapped around and pasted in the groove of the measuring ring, and the steel tube fiber optic cable is a seamless metal tube.

[0016] The beneficial effects of adopting the above-mentioned further technical solution are: the hollow, seamless, corrosion-resistant metal tube improves the corrosion resistance of the steel pipe optical fiber cable. The communication optical fiber used to transmit optical signals is threaded inside the metal tube, and the metal tube protects the communication optical fiber.

[0017] Furthermore, the measuring tool body has an eccentric flow channel in the middle along the axial direction, and a bypass hole is provided on one side of the top of the measuring tool body. The bypass hole has an internal thread, and a cable anchoring sealing joint is installed in the bypass hole. The cable anchoring sealing joint has external threads on both the top and bottom outer walls. A sealing ring is fitted on the bottom of the cable anchoring sealing joint. The bottom of the cable anchoring sealing joint is installed in the bypass hole. The sealing ring is located between the cable anchoring sealing joint and the bypass hole. A locking nut is provided on the top of the cable anchoring sealing joint. Both the cable anchoring sealing joint and the locking nut are fitted on the outside of the steel tube optical fiber cable.

[0018] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the eccentric flow channel is used for circulating fluid during downhole operations. A metal seal structure is formed between the cable anchoring sealing joint and the steel pipe fiber optic cable to isolate downhole high pressure. The eccentric flow channel and bypass orifice effectively physically isolate the circulating fluid channel from the data communication channel.

[0019] Furthermore, the top of the measuring tool body is provided with a threaded ring positioning key and a threaded ring, and the outer side wall of the top of the measuring tool body is provided with an annular groove. The threaded ring positioning key and the threaded ring are both installed in the annular groove, and the outer side wall of the threaded ring is provided with an external thread.

[0020] The beneficial effects of adopting the above-mentioned further technical solution are: the setting of the threaded ring positioning key ensures that no relative rotational movement occurs between the measuring tool and other tools when they are connected, eliminating the twisting and knotting of steel pipes and fiber optic cables. When the threaded ring is rotated, the external thread tightens with the internal thread of other tools.

[0021] Furthermore, the present invention also provides a coiled tubing downhole load measurement system, comprising a coiled tubing downhole load measurement tool as described in any one of the above claims, and further comprising: a surface system, a fiber optic transceiver, a coiled tubing drum, a coiled tubing, a coiled tubing connector, a cable-through check valve short section, a screw drill bit, and a milling tool. The surface system is connected to the fiber optic transceiver, the fiber optic transceiver is mounted on the coiled tubing drum, the fiber optic transceiver is connected to the coiled tubing via a steel pipe fiber optic cable, the coiled tubing is connected to the coiled tubing connector via a steel pipe fiber optic cable, the coiled tubing connector is connected to the cable-through check valve short section via a steel pipe fiber optic cable, and the cable-through check valve short section is connected to the coiled tubing downhole load measurement tool via a steel pipe fiber optic cable.

[0022] The beneficial effects of adopting the technical solution of this invention are as follows: It utilizes the wavelength change reflected back by the fiber optic sensor array to reflect the strain change of the measured object, realizing real-time measurement of the load on the downhole drilling tool during coiled tubing operations. Using light as the medium, it achieves the measurement and transmission of load parameters. The downhole portion does not require high-voltage power supply from the ground, making coiled tubing operations safer. The fiber optic sensor array measures the micro-strain on the drilling tool body, and the measurement data is uploaded to the ground system at high speed through the fiber optic cable built into the coiled tubing. The measuring tool does not use electronic components, has a simple structure, is suitable for high-temperature downhole environments, and has high reliability. The fiber optic transceiver sends optical signals to the communication fiber optic cable according to the instructions from the ground system, and simultaneously receives the optical signals reflected back by the fiber optic sensor array. The ground system decodes and analyzes the signals to achieve real-time monitoring of the load status of the downhole drilling tool.

[0023] Furthermore, the steel pipe fiber optic cable is located inside the continuous tube, the continuous tube connector, and the cable check valve short section, respectively.

[0024] The beneficial effects of adopting the above-mentioned further technical solutions are: facilitating the laying of steel pipe optical fiber cables and communication optical fibers, and providing protection for steel pipe optical fiber cables and communication optical fibers.

[0025] The advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the download measurement tool for continuous tubing wells provided in an embodiment of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the fiber optic sensing array provided in an embodiment of the present invention.

[0028] Figure 3 This is a schematic diagram of the structure of the continuous tubing downhole load measurement system provided in an embodiment of the present invention.

[0029] Reference numerals: 1. Locking nut; 2. Cable anchoring sealing connector; 3. Sealing ring; 4. Bypass hole; 5. Measuring tool body; 6. Fiber optic sensor array; 7. Sealing protective sleeve; 8. Lower connector; 9. Threaded ring locating key; 100. Steel pipe fiber optic cable; 101. Communication fiber optic cable; 611. First fiber optic strain gauge; 612. Second fiber optic strain gauge; 631. Third fiber optic strain gauge; 632. Fourth fiber optic strain gauge; 621. Fifth fiber optic strain gauge. 622, Sixth Fiber Optic Strain Gauge; 641, Seventh Fiber Optic Strain Gauge; 642, Eighth Fiber Optic Strain Gauge; 10, Threaded Ring; 11, Annular Groove; 12, Eccentric Flow Channel; 13, Measuring Ring Groove; 20, Surface System; 21, Fiber Optic Transceiver; 22, Coiled Tube Roller; 23, Coiled Tube; 24, Coiled Tube Connector; 25, Cable Check Valve Short Section; 26, Coiled Tube Downhole Load Measurement Tool; 27, Screw Drill Tool; 28, Milling Tool. Detailed Implementation

[0030] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0031] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a continuous tubing well load measurement tool, including: a measurement tool body 5, an optical fiber sensor array 6, a sealing protective sleeve 7, a lower connector 8, a steel pipe optical fiber cable 100, and a communication optical fiber 101. A measurement ring groove 13 is provided on the middle outer wall of the measurement tool body 5. The optical fiber sensor array 6 is installed in the measurement ring groove 13. The sealing protective sleeve 7 is fitted onto the middle outer wall of the measurement tool body 5 and covers the measurement ring groove 13. The lower connector 8 is fitted onto the bottom outer wall of the measurement tool body 5. The communication optical fiber 101 passes through the top of the measurement tool body 5 and is connected to the optical fiber sensor array 6. The steel pipe optical fiber cable 100 is fitted onto the outside of the communication optical fiber 101 and is located at the top of the measurement tool body 5.

[0032] The beneficial effects of adopting the technical solution of this invention are as follows: the wavelength change reflected back by the fiber optic sensor array reflects the strain change of the measured object, realizing real-time measurement of the load on the downhole drilling tool during coiled tubing operation. The load parameters are measured and transmitted using light as a medium. The downhole part does not require high-voltage power supply from the ground, making coiled tubing operation safer. The fiber optic sensor array measures the micro-strain on the main body of the drilling tool, and the measurement data is uploaded to the ground system at high speed through the fiber optic cable built into the coiled tubing. The measuring tool does not use electronic components, has a simple structure, is suitable for operation in high-temperature downhole environments, and has high reliability.

[0033] The measuring tool (coiled tubing downhole load measuring tool) provided in this invention requires no external power supply, which simplifies the ground control system (ground system) and eliminates the risk of high-voltage electricity use. The strain measured by the fiber optic sensor array is transmitted to the ground in real time via optical fiber. Data acquisition and processing are handled by the ground system. The downhole tool (coiled tubing downhole load measuring tool) has no internal electrical components, has a simple structure, and is suitable for the high-temperature environment downhole. The fiber optic sensor (fiber optic sensor array) used has strong anti-electromagnetic interference capability, high sensitivity, and high measurement accuracy.

[0034] like Figure 1 and Figure 2 As shown, the fiber optic sensing array 6 further includes: a first fiber optic strain gauge 611 for measuring axial tensile and compressive loads, a second fiber optic strain gauge 612 for measuring axial tensile and compressive loads, a third fiber optic strain gauge 631 for measuring axial tensile and compressive loads, a fourth fiber optic strain gauge 632 for measuring axial tensile and compressive loads, a fifth fiber optic strain gauge 621 for measuring torque loads, a sixth fiber optic strain gauge 622 for measuring torque loads, a seventh fiber optic strain gauge 641 for measuring torque loads, and an eighth fiber optic strain gauge 642 for measuring torque loads. The first fiber optic strain gauge 611, the second fiber optic strain gauge 612, the third fiber optic strain gauge 631, the fourth fiber optic strain gauge 632, the fifth fiber optic strain gauge 621, and the sixth fiber optic strain gauge 642... 22. The seventh fiber strain gauge 641 and the eighth fiber strain gauge 642 are both installed in the measuring ring groove 13. The communication fiber 101 is connected to the first fiber strain gauge 611. The first fiber strain gauge 611 is connected to the second fiber strain gauge 612. The second fiber strain gauge 612 is connected to the sixth fiber strain gauge 622. The sixth fiber strain gauge 622 is connected to the fifth fiber strain gauge 621. The fifth fiber strain gauge 621 is connected to the third fiber strain gauge 631. The third fiber strain gauge 631 is connected to the fourth fiber strain gauge 632. The fourth fiber strain gauge 632 is connected to the eighth fiber strain gauge 642. The eighth fiber strain gauge 642 is connected to the seventh fiber strain gauge 641.

[0035] The beneficial effect of adopting the above-mentioned further technical solution is that multiple fiber optic strain gauges are used to measure axial tensile and compressive loads and torque loads at different positions, thereby improving measurement accuracy.

[0036] like Figure 1 and Figure 2As shown, further, the first fiber optic strain gauge 611 and the third fiber optic strain gauge 631 are arranged parallel to the axis of the measuring tool body 5, the second fiber optic strain gauge 612 and the fourth fiber optic strain gauge 632 are arranged perpendicular to the axis of the measuring tool body 5, the angle between the fifth fiber optic strain gauge 621 and the seventh fiber optic strain gauge 641 and the axis of the measuring tool body 5 is -45 degrees, and the angle between the sixth fiber optic strain gauge 622 and the eighth fiber optic strain gauge 642 and the axis of the measuring tool body 5 is +45 degrees.

[0037] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the first to fourth fiber optic strain gauges for measuring axial tensile and compressive loads are arranged in the axial and perpendicular positions, and the fifth to sixth fiber optic strain gauges for measuring torque loads are arranged in the ±45° direction. This arrangement can achieve low coupling measurement of the two loads. The ground system performs load calibration and measurement on the measuring tool according to the Wheatstone bridge principle.

[0038] Among them, such as Figure 2 The structure shown can be referenced to the axis of the measuring tool body 5. A tilt of 45 degrees to the left relative to the axis of the measuring tool body 5 is -45 degrees, and a tilt of 45 degrees to the right relative to the axis of the measuring tool body 5 is +45 degrees. The positive and negative signs represent the direction of tilt relative to the axis of the measuring tool body 5.

[0039] For ease of understanding and intuitive observation, Figure 2 The structure shown is a schematic diagram of the unfolded structure of the fiber optic sensor array 6, which is arranged around the middle outer wall of the measuring tool body 5. During normal use, the fiber optic sensor array 6 is arranged in the measuring ring groove 13 around the middle outer wall of the measuring tool body 5. Figure 2 The 0°, 90°, 180°, and 270° positions located below the fiber optic sensing array 6 are reference points selected on the outer wall of the middle portion of the measuring tool body 5. The 0° position is the reference point, and the 90°, 180°, and 270° positions are respectively located radially along the periphery of the outer wall of the middle portion of the measuring tool body 5. The first fiber optic strain gauge 611 and the second fiber optic strain gauge 612 can be located at the reference point 0° on the outer wall of the middle portion of the measuring tool body 5. The seventh fiber optic strain gauge 641 and the eighth fiber optic strain gauge 642 can be located at the 270° position on the outer wall of the middle portion of the measuring tool body 5. That is, the reference point 0° and the 180° position are set opposite each other, corresponding to the front and rear sides of the outer wall of the middle portion of the measuring tool body 5, respectively. The 90° and 270° positions are set opposite each other, corresponding to the left and right sides of the outer wall of the middle portion of the measuring tool body 5, respectively.

[0040] like Figure 1 and Figure 2As shown, the first fiber strain gauge 611 is located above the second fiber strain gauge 612, the fifth fiber strain gauge 621 is located above the sixth fiber strain gauge 622, the third fiber strain gauge 631 is located above the fourth fiber strain gauge 632, and the seventh fiber strain gauge 641 is located above the eighth fiber strain gauge 642.

[0041] The beneficial effect of adopting the above-mentioned further technical solution is that multiple fiber optic strain gauges are used to measure axial tensile and compressive loads and torque loads at different positions, thereby improving measurement accuracy.

[0042] like Figure 1 and Figure 2 As shown, further, the first fiber strain gauge 611, the second fiber strain gauge 612, the third fiber strain gauge 631, the fourth fiber strain gauge 632, the fifth fiber strain gauge 621, the sixth fiber strain gauge 622, the seventh fiber strain gauge 641, and the eighth fiber strain gauge 642 are all Bragg grating strain gauges, and the Bragg wavelength ranges of the first fiber strain gauge 611, the second fiber strain gauge 612, the third fiber strain gauge 631, the fourth fiber strain gauge 632, the fifth fiber strain gauge 621, the sixth fiber strain gauge 622, the seventh fiber strain gauge 641, and the eighth fiber strain gauge 642 are at least 5 nm apart.

[0043] The beneficial effects of adopting the above-mentioned further technical solution are: the Bragg wavelength ranges of the fiber optic strain gauges in the fiber optic sensing array are maintained at least 5nm apart, so that the ground can accurately identify the strain measurement data. Since each fiber optic strain gauge has a different wavelength range, the ground data acquisition system can accurately identify the measurement values ​​corresponding to the cascaded fiber optic strain gauges.

[0044] like Figure 1 and Figure 2 As shown, the fiber optic sensing array 6 is further attached around the measuring ring groove 13, and the steel pipe fiber optic cable 100 is a seamless metal tube.

[0045] The beneficial effects of adopting the above-mentioned further technical solution are: the hollow, seamless, corrosion-resistant metal tube improves the corrosion resistance of the steel pipe optical fiber cable. The communication optical fiber used to transmit optical signals is threaded inside the metal tube, and the metal tube protects the communication optical fiber.

[0046] like Figure 1 and Figure 2As shown, further, the measuring tool body 5 has an eccentric flow channel 12 in the middle along the axial direction, and a bypass hole 4 is provided on one side of the top of the measuring tool body 5. The bypass hole 4 has an internal thread, and a cable anchoring sealing joint 2 is installed in the bypass hole 4. The top and bottom outer walls of the cable anchoring sealing joint 2 are provided with external threads. A sealing ring 3 is fitted at the bottom of the cable anchoring sealing joint 2. The bottom of the cable anchoring sealing joint 2 is installed in the bypass hole 4. The sealing ring 3 is located between the cable anchoring sealing joint 2 and the bypass hole 4. A locking nut 1 is provided at the top of the cable anchoring sealing joint 2. The cable anchoring sealing joint 2 and the locking nut 1 are both fitted on the outside of the steel pipe optical fiber cable 100.

[0047] The beneficial effects of adopting the above-mentioned further technical solution are as follows: the eccentric flow channel is used for circulating fluid during downhole operations. A metal seal structure is formed between the cable anchoring sealing joint and the steel pipe fiber optic cable to isolate downhole high pressure. The eccentric flow channel and bypass orifice effectively physically isolate the circulating fluid channel from the data communication channel.

[0048] like Figure 1 and Figure 2 As shown, the top of the measuring tool body 5 is provided with a threaded ring positioning key 9 and a threaded ring 10. The outer side wall of the top of the measuring tool body 5 is provided with an annular groove 11. The threaded ring positioning key 9 and the threaded ring 10 are both installed in the annular groove 11. The outer side wall of the threaded ring 10 is provided with an external thread.

[0049] The beneficial effects of adopting the above-mentioned further technical solution are: the setting of the threaded ring positioning key ensures that no relative rotational movement occurs between the measuring tool and other tools when they are connected, eliminating the twisting and knotting of steel pipes and fiber optic cables. When the threaded ring is rotated, the external thread tightens with the internal thread of other tools.

[0050] This invention provides a coiled tubing downhole load measurement tool that can measure loads during coiled tubing downhole operations based on fiber optic sensing principles. Figure 1 As shown, it consists of a locking nut 1, a cable anchoring sealing connector 2, a threaded ring positioning key 9, a threaded ring 10, a measuring tool body 5, an optical fiber sensor array 6, a sealing protective sleeve 7, a lower connector 8, a steel pipe optical fiber cable 100, and a communication optical fiber 101.

[0051] The measuring tool body 5 has a measuring ring groove 13 on its outer cylindrical surface; the sealing protective sleeve 7 seals the fiber optic sensor array 6 inside the measuring ring groove 13; the fiber optic sensor array 6 is attached to the cylindrical surface of the measuring ring groove 13; the steel pipe fiber optic cable 100 is built inside the continuous tube 23; the cable anchoring sealing joint 2 is installed on the upper side of the measuring tool body 5 structure.

[0052] The threaded ring positioning key 9 is used to ensure that the measuring tool (continuous tubing downhole load measuring tool) does not rotate relative to other tools when connected to them, and to prevent steel pipes, optical fiber cables and communication optical fibers from twisting and knotting.

[0053] The threaded ring 10 is assembled from two semi-circular components and installed in the annular groove 11 on the upper part of the measuring tool body 5. The threaded ring 10 is machined with external threads, and when the threaded ring 10 is rotated, the external threads are tightened with the internal threads of other tools.

[0054] The outer layer of the steel pipe fiber optic cable 100 is a hollow, seamless, corrosion-resistant metal tube, and a communication fiber optic cable 101 for transmitting optical signals is inserted inside the metal tube.

[0055] The flow channel inside the main body 5 of the measuring tool is an eccentric structure (eccentric flow channel) used for circulating fluid during downhole operations.

[0056] A bypass hole 4 is machined on one side of the upper end of the measuring tool body 5, and an internal thread is machined on the upper end of the bypass hole 4.

[0057] The cable anchoring sealing joint 2 has external threads at both ends and a sealing ring 3 at one end. The end with the sealing ring 3 is connected to the internal thread of the bypass hole 4.

[0058] The upper part of the cable anchoring sealing joint 2 is provided with a locking nut 1. After the steel pipe fiber optic cable 100 is inserted into the cable anchoring sealing joint 2, the locking nut 1 is connected to the other end of the cable anchoring sealing joint 2. The outer seamless steel pipe of the anchoring steel pipe fiber optic cable 100 and the inner seamless alloy pipe of the cable anchoring sealing joint 2 form a metal sealing structure to isolate the high pressure downhole.

[0059] The communication optical fiber 101 inside the steel pipe optical fiber cable 100 can pass through the bypass hole 4 and enter the measuring ring groove 13.

[0060] The fiber optic sensing array 6 is connected to the communication fiber optic cable 101 in the steel pipe fiber optic cable 100 within the measurement ring groove.

[0061] The eccentric flow channel 12 and bypass hole 4 of the main body 5 of the measuring tool effectively isolate the circulating liquid channel from the data communication channel.

[0062] The fiber optic sensing array 6 consists of 8 Bragg grating strain gauge sensors (fiber optic strain gauges) connected in series. Four of the grating strain gauges (fiber optic strain gauges) are used to measure axial tensile and compressive loads, and the other four grating strain gauges (fiber optic strain gauges) are used to measure torque loads.

[0063] The Bragg wavelength range of the grating strain gauges (fiber strain gauges) in the fiber optic sensing array 6 is maintained at least 5 nm intervals so that the strain measurement data can be accurately identified on the ground.

[0064] The strain change of the measured object is reflected by the wavelength change of the fiber optic strain sensor (fiber optic strain gauge), such as... Figure 2 As shown, each strain gauge has a different wavelength range, and the ground data acquisition system (ground system) can accurately identify the measurement values ​​corresponding to the cascaded fiber optic strain gauges. The fiber optic strain gauges for measuring axial tensile and compressive loads (the first to fourth fiber optic strain gauges) are arranged in axial and perpendicular positions, while the fiber optic strain gauges for measuring torque loads (the fifth to eighth fiber optic strain gauges) are arranged at ±45° angles. This arrangement enables low-coupling measurement of the two loads. The ground system performs load calibration and measurement on the measuring tool (coilover downhole load measuring tool) based on the Wheatstone bridge principle.

[0065] like Figure 3 As shown, the present invention also provides a coiled tubing downhole load measurement system, including a coiled tubing downhole load measurement tool as described in any of the above-mentioned claims, and further including: a surface system 20, a fiber optic transceiver 21, a coiled tubing drum 22, a coiled tubing 23, a coiled tubing connector 24, a cable-through check valve sub-section 25, a screw drill bit 27, and a milling tool 28. The surface system 20 is connected to the fiber optic transceiver 21, the fiber optic transceiver 21 is mounted on the coiled tubing drum 22, the fiber optic transceiver 21 is connected to the coiled tubing 23 via a steel pipe fiber optic cable 100, the coiled tubing 23 is connected to the coiled tubing 23 connector via a steel pipe fiber optic cable 100, the coiled tubing connector 24 is connected to the cable-through check valve sub-section 25 via a steel pipe fiber optic cable 100, and the cable-through check valve sub-section 25 is connected to the coiled tubing downhole load measurement tool 26 via a steel pipe fiber optic cable 100.

[0066] The beneficial effects of adopting the technical solution of this invention are as follows: It utilizes the wavelength change reflected back by the fiber optic sensor array to reflect the strain change of the measured object, realizing real-time measurement of the load on the downhole drilling tool during coiled tubing operations. Using light as the medium, it achieves the measurement and transmission of load parameters. The downhole portion does not require high-voltage power supply from the ground, making coiled tubing operations safer. The fiber optic sensor array measures the micro-strain on the drilling tool body, and the measurement data is uploaded to the ground system at high speed through the fiber optic cable built into the coiled tubing. The measuring tool does not use electronic components, has a simple structure, is suitable for high-temperature downhole environments, and has high reliability. The fiber optic transceiver sends optical signals to the communication fiber optic cable according to the instructions from the ground system, and simultaneously receives the optical signals reflected back by the fiber optic sensor array. The ground system decodes and analyzes the signals to achieve real-time monitoring of the load status of the downhole drilling tool.

[0067] like Figure 3 As shown, the steel pipe fiber optic cable 100 is further located inside the continuous pipe 23, the continuous pipe connector 24, and the cable one-way valve stub 25, respectively.

[0068] The beneficial effects of adopting the above-mentioned further technical solutions are: facilitating the laying of steel pipe optical fiber cables and communication optical fibers, and providing protection for steel pipe optical fiber cables and communication optical fibers.

[0069] This invention provides a coiled tubing downhole load measurement system that can measure loads during coiled tubing downhole operations based on fiber optic sensing principles, such as... Figure 3 As shown, the downhole BHA (downhole drill assembly) consists of a coiled tubing connector 24, a cable-through check valve sub 25, a coiled tubing downhole load measuring tool 26, a screw drill bit 27, and a milling tool 28.

[0070] A steel pipe fiber optic cable 100 is threaded inside the continuous tube 23. The steel pipe fiber optic cable 100 is led out from the continuous tube drum 22. The fiber optic transceiver 21, which is fixed on the continuous tube drum 22, is connected to the communication fiber optic cable 101. The fiber optic transceiver 21 sends optical signals to the communication fiber optic cable 101 according to the instructions of the ground system 20, and at the same time receives the optical signals reflected back by the fiber optic sensor array 6. The ground system 20 decodes and analyzes the signals to realize real-time monitoring of the load status of the downhole drilling tools.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A continuous tubular wellbore load measurement tool, characterized in that, include: The measuring tool body comprises a fiber optic sensor array, a sealing protective sleeve, a lower connector, a steel pipe fiber optic cable, and a communication fiber optic cable. A measuring ring groove is provided on the outer wall of the middle portion of the measuring tool body. The fiber optic sensor array is installed in the measuring ring groove. The sealing protective sleeve is fitted onto the outer wall of the middle portion of the measuring tool body and covers the measuring ring groove. The lower connector is fitted onto the outer wall of the bottom portion of the measuring tool body. The communication fiber optic cable passes through the top of the measuring tool body and is connected to the fiber optic sensor array. The steel pipe fiber optic cable is fitted onto the outside of the communication fiber optic cable and is located at the top of the measuring tool body. The fiber optic sensor array... The series includes: a first fiber optic strain gauge for measuring axial tensile and compressive loads, a second fiber optic strain gauge for measuring axial tensile and compressive loads, a third fiber optic strain gauge for measuring axial tensile and compressive loads, a fourth fiber optic strain gauge for measuring axial tensile and compressive loads, a fifth fiber optic strain gauge for measuring torque loads, a sixth fiber optic strain gauge for measuring torque loads, a seventh fiber optic strain gauge for measuring torque loads, and an eighth fiber optic strain gauge for measuring torque loads. All fiber strain gauges are installed in the groove of the measuring ring. The communication optical fiber is connected to the first fiber strain gauge, the first fiber strain gauge is connected to the second fiber strain gauge, the second fiber strain gauge is connected to the sixth fiber strain gauge, the sixth fiber strain gauge is connected to the fifth fiber strain gauge, the fifth fiber strain gauge is connected to the third fiber strain gauge, the third fiber strain gauge is connected to the fourth fiber strain gauge, the fourth fiber strain gauge is connected to the eighth fiber strain gauge, and the eighth fiber strain gauge is connected to the seventh fiber strain gauge. The first and third fiber strain gauges are arranged parallel to the axis of the measuring tool body. The second and fourth fiber optic strain gauges are arranged perpendicular to the axis of the measuring tool body. The angle between the fifth and seventh fiber optic strain gauges and the axis of the measuring tool body is -45 degrees, and the angle between the sixth and eighth fiber optic strain gauges and the axis of the measuring tool body is +45 degrees. The first fiber optic strain gauge is located above the second fiber optic strain gauge, the fifth fiber optic strain gauge is located above the sixth fiber optic strain gauge, the third fiber optic strain gauge is located above the fourth fiber optic strain gauge, and the seventh fiber optic strain gauge is located above the eighth fiber optic strain gauge.The first, second, third, fourth, fifth, sixth, seventh, and eighth fiber optic strain gauges are all Bragg grating strain gauges, and the Bragg wavelength ranges of the first, second, third, fourth, fifth, sixth, seventh, and eighth fiber optic strain gauges are at least 5 nm apart.

2. The coiled tubing well download measuring tool according to claim 1, characterized in that, The fiber optic sensing array is wrapped around and pasted in the groove of the measuring ring, and the steel pipe fiber optic cable is a seamless metal tube.

3. The coiled tubing downhole load measuring tool according to claim 1, characterized in that, The measuring tool body has an eccentric flow channel in the middle along the axial direction. A bypass hole is provided on one side of the top of the measuring tool body. The bypass hole has an internal thread. A cable anchoring sealing joint is installed in the bypass hole. The cable anchoring sealing joint has external threads on its top and bottom outer walls. A sealing ring is fitted on the bottom of the cable anchoring sealing joint. The bottom of the cable anchoring sealing joint is installed in the bypass hole. The sealing ring is located between the cable anchoring sealing joint and the bypass hole. A locking nut is provided on the top of the cable anchoring sealing joint. Both the cable anchoring sealing joint and the locking nut are fitted on the outside of the steel pipe optical fiber cable.

4. The coiled tubing downhole load measuring tool according to claim 1, characterized in that, The top of the measuring tool body is provided with a threaded ring positioning key and a threaded ring. The outer side wall of the top of the measuring tool body is provided with an annular groove. The threaded ring positioning key and the threaded ring are both installed in the annular groove. The outer side wall of the threaded ring is provided with an external thread.

5. A coiled tubing downhole load measurement system, characterized in that, The coiled tubing downhole load measuring tool, comprising any one of claims 1 to 4, further includes: a surface system, a fiber optic transceiver, a coiled tubing drum, a coiled tubing, a coiled tubing connector, a cable-through check valve short section, a screw drill bit, and a milling tool. The surface system is connected to the fiber optic transceiver, which is mounted on the coiled tubing drum. The fiber optic transceiver is connected to the coiled tubing via a steel pipe fiber optic cable. The coiled tubing is connected to the coiled tubing connector via a steel pipe fiber optic cable. The coiled tubing connector is connected to the cable-through check valve short section via a steel pipe fiber optic cable. The cable-through check valve short section is connected to the coiled tubing downhole load measuring tool via a steel pipe fiber optic cable.

6. The coiled tubing downhole load measurement system according to claim 5, characterized in that, The steel pipe fiber optic cable is located inside the continuous tube, the continuous tube connector, and the cable check valve short section, respectively.

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