A straight well inclinometer device and a straight well inclinometer method for high temperature and high pressure environments

Abstract

The present application relates to the technical field of downhole measurement, and is a straight well inclinometer device and straight well inclinometer method for high temperature and high pressure environment. The former comprises an upper joint, a transition sub, a connecting neck, a throttle sleeve, a valve head, a valve stem, a valve sheath, an outer sheath, a magneto-rheological fluid assembly and a measuring sub. A first limit ring table is arranged on the inner side of the upper end of the upper joint. The steps of the latter are as follows: S1: providing a straight well inclinometer system, which comprises a straight well inclinometer device for high temperature and high pressure environment, a surface pressure gauge, a lower computer and an upper computer, and installing the straight well inclinometer device for high temperature and high pressure environment in the middle of the oil and gas well drilling string. The present application has reasonable and compact structure, and is convenient to use. By arranging a throttle curved surface and cooperating with valve heads at different positions, the flow area between the valve head and the throttle sleeve changes, so that the measured drilling fluid pressure on the ground also changes. By turning on and off the power of the magnetic field generator, the state of the magneto-rheological fluid changes, and the present application has the characteristics of stability, reliability and fast response.

Description

Technical Field

[0001] This invention relates to the field of downhole measurement technology, and is a vertical well inclination measurement device and method for use in high-temperature and high-pressure environments. Background Technology

[0002] In oil and gas drilling production, wellbore structures designed according to development processes include vertical wells and curved wells. During vertical well drilling, excessive well deviation can lead to problems such as failure to encounter oil-bearing formations or low encounter rates, and in severe cases, well abandonment. This is especially true during operations under high temperature, high pressure, and steep geological conditions, which can easily result in low mechanical drilling rates, high drilling costs, and long drilling cycles.

[0003] Chinese patent document CN 102536192 B discloses a dynamic control system for the tool face of a downhole directional drilling tool. It includes a drill bit, a bend-angle directional drilling tool, a measurement-while-drilling (MWD) system, drill pipe, drill platform, top drive, and a riser top drive servo and braking system. The drill bit is connected to the bend-angle directional drilling tool, which is connected to the MWD system. The MWD system is connected to the drill pipe, the upper end of which passes through the drill platform. The top of the drill pipe is connected to the top drive, which is connected to the riser. A pressure signal sensor of the MWD system is installed on the riser. The system is characterized by further including a tool face decoding system and a dynamic tool face control system. The system comprises a top drive angle sensing system, a top drive angle signal processing system, and a top drive servo and braking system. The input of the tool face decoding system is connected to the pressure signal sensor of the measurement-while-drilling (MWD) system, and the output is connected to the dynamic tool face control system. The dynamic tool face control system is pre-installed in a monitoring computer. The output of the dynamic tool face control system is connected to the top drive servo and braking system. The top drive servo and braking system is connected to the top drive and the top drive angle sensing system. The output of the top drive angle sensing system is connected to the top drive angle signal processing system, and the output of the top drive angle signal processing system is connected to the dynamic tool face control system. In vertical well drilling, the well inclination measurement in the vertical section is performed using a MWD instrument. However, MWD instruments suffer from problems such as high cost, complex structure, high operational technical threshold, and low drill string assembly strength.

[0004] Magnetorheological fluids (MR fluids) are a novel type of fluid with controllable flowability. They exhibit low-viscosity Newtonian fluid characteristics in the absence of an external magnetic field, but become high-viscosity, low-flowability Bingham fluids under an applied magnetic field. MR fluids are special suspension systems formed by uniformly dispersing micron-sized magnetizable particles in a specific carrier mother liquor and additives. Under the influence of an external magnetic field, they exhibit non-Newtonian fluid characteristics, transforming from a freely flowing liquid to a semi-solid or even a solid within milliseconds. They display strong controllable rheological properties, characterized by low conversion energy consumption, ease of control, and rapid response. Summary of the Invention

[0005] This invention provides a vertical well inclination measurement device and method for use in high temperature and high pressure environments, which overcomes the shortcomings of the prior art. It can effectively solve the problem of complex structure of drilling measurement instruments, and further solve the problem of complex operation of existing inclination measurement instruments when performing well inclination measurement.

[0006] One of the technical solutions of this invention is achieved through the following measures: A vertical well inclination measurement device for high temperature and high pressure environments includes an upper connector, a transition sub, a connecting neck, a throttling sleeve, a valve head, a valve stem, a valve sleeve, an outer casing, a magnetorheological fluid assembly, and a measuring sub. A first limiting ring is provided on the inner side of the upper end of the upper connector. A transition sub is fixedly installed on the inner side of the lower end of the upper connector. A vertically penetrating mounting hole is provided in the center of the transition sub. At least one vertically penetrating flow hole is provided on the transition sub at the outer position corresponding to the mounting hole. A connecting neck is provided on the lower side of the transition sub at the position corresponding to the mounting hole. A connecting neck is provided corresponding to the first limiting ring. A throttling sleeve is installed inside the upper connector between the platform and the transition sub. A valve head is located on the inner side of the upper part of the throttling sleeve, and a valve stem with its lower end positioned below the throttling sleeve is located at the lower end of the valve head. A throttling curved surface is located on the inner side of the throttling sleeve corresponding to the valve head position. A valve sleeve is located on the outer side of the middle part of the valve stem, and a sleeve annular groove is located on the lower side of the valve head corresponding to the valve sleeve position. The lower end of the valve sleeve is fixedly installed inside the transition sub. An outer casing is fixedly installed on the outer side of the lower part of the connecting neck. Inside the outer casing is a magnetorheological fluid assembly capable of adjusting the flow area of ​​drilling fluid at the valve head and the throttling curved surface. The magnetorheological fluid assembly includes a top cap, a non-magnetic spring, a bottom cap, and a magnetic... The system includes a field generator, support sleeve, wear-resistant sleeve, piston cap, balance spring, and adapter. The lower end of the valve stem is fixedly installed to the upper end of the top cap. A bottom cap is located on the inner side of the upper part of the outer casing corresponding to the position below the top cap. The bottom cap has a first through-hole. A non-magnetic spring is installed between the top cap and the bottom cap. An adapter is fixedly installed on the inner side of the lower end of the outer casing. A wear-resistant sleeve is fixedly installed on the outer side of the upper end of the adapter. A second limiting ring is located on the inner side of the upper end of the wear-resistant sleeve. A piston cap is located on the inner side of the upper part of the wear-resistant sleeve corresponding to the position below the second limiting ring. A flat joint is provided between the piston cap and the adapter. The balance spring has a magnetorheological fluid inside the outer casing corresponding to the position between the top cap and the piston cap. A third limiting ring platform is provided on the inner side of the middle of the outer casing. A magnetic field generator that can change the state of the magnetorheological fluid is provided on the third limiting ring platform. A second flow hole is provided on the magnetic field generator. A support sleeve is provided between the upper end of the magnetic field generator and the lower end of the bottom cap. A balance cavity is provided in the wear-resistant sleeve corresponding to the position between the piston sleeve and the conversion joint. A balance hole that can communicate with the balance cavity is provided on the outer side of the lower end of the conversion joint. A measuring short section is fixedly installed at the lower end of the conversion joint. A vibration sensor, an inclination sensor and a data processor are provided inside the measuring short section.

[0007] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions: The aforementioned magnetic field generator may include a generator body, a magnetoresistive tube, an iron core, and a coil. An upper outer ring platform is provided on the outer side of the upper end of the generator body, and a lower outer ring platform is provided on the outer side of the lower end of the generator body. At least two vertically penetrating upper magnetoresistive holes are provided on the upper outer ring platform at circumferential intervals. A vertically penetrating lower magnetoresistive hole is provided on the lower outer ring platform corresponding to the position of each upper magnetoresistive hole. A magnetoresistive tube is fixedly installed between each pair of corresponding upper and lower magnetoresistive holes. An iron core is provided on the outer side of the generator body at the position between the upper and lower outer ring platforms, and a coil is wound on the outer side of the iron core.

[0008] The aforementioned measurement section may include a measuring outer cylinder, a circuit frame, a circuit board, a fixing frame, a lithium battery, and an end cap. The lower end of the adapter is fixedly installed on the inner side of the upper end of the measuring outer cylinder, and an end cap is fixedly installed on the inner side of the lower end of the measuring outer cylinder. Inside the measuring outer cylinder, from top to bottom, there are a vibration sensor, a tilt sensor, a circuit frame, and a fixing frame. The circuit frame contains a circuit board, and the circuit board contains a data processor. The fixing frame contains a lithium battery. The coil, vibration sensor, and tilt sensor are all connected to the circuit board.

[0009] The above may also include a power line, a pressure-bearing sealing plug, and a plug. The lower end of the generator body is provided with a first wiring hole. The outer side of the wear-resistant sleeve is provided with a vertically penetrating wiring groove. The upper end of the wear-resistant sleeve is provided with an upper notch corresponding to the upper position of the wiring groove, and the lower end of the wear-resistant sleeve is provided with a lower notch corresponding to the lower position of the wiring groove. The lower center of the conversion connector is provided with a blind mounting hole. The blind mounting hole is provided with a pressure-bearing sealing plug. The blind mounting hole is provided with a second wiring hole that can communicate with the lower notch. The first end of the power line passes through the first wiring hole and connects to the coil. The second end of the power line passes through the upper notch, the wiring groove, the lower notch, and the second wiring hole in sequence and then enters the pressure-bearing sealing plug. The lower outer side of the conversion connector is provided with a fluid-changing hole that can communicate with the second wiring hole. The inner side of the outer end of the fluid-changing hole is provided with a plug.

[0010] The throttling sleeve may have an upper flow hole, a middle flow hole and a lower flow hole connected sequentially from top to bottom in the middle part. The middle flow hole is a throttling curved surface that is narrow at the top and wide at the bottom. A valve stem is provided inside the throttling sleeve, and a valve head is provided at the upper end of the valve stem. The upper end of the valve head is a conical surface that is small at the top and large at the bottom.

[0011] The above may also include O-rings, with an O-ring between the top cap and the connecting neck, an O-ring between the top cap and the outer sleeve, an O-ring between the piston cap and the wear-resistant sleeve, an O-ring between the adapter and the wear-resistant sleeve, and an O-ring between the adapter and the outer sleeve.

[0012] The top cap may have a downward-opening upper blind hole at its lower end, and the bottom cap may have a upward-opening lower blind hole at its upper end. The upper end of the non-magnetic spring is located in the upper blind hole, and the lower end of the non-magnetic spring is located in the lower blind hole.

[0013] The second technical solution of the present invention is achieved through the following measures: a method for vertical well inclination measurement using the above-mentioned vertical well inclination measurement device for high temperature and high pressure environments, comprising the following steps: S1: Provides a vertical well surveying system, which includes a vertical well surveying device for high-temperature and high-pressure environments, a surface pressure gauge, a lower-level computer, and a higher-level computer. The vertical well surveying device for high-temperature and high-pressure environments is installed in the middle of the oil and gas well drill string. During normal drilling, the magnetic field generator is de-energized and the magnetorheological fluid is in a liquid state, which puts the vertical well surveying system into a dormant state. The mud pump is turned on, the drilling fluid in the drill string circulates, and the valve head moves downward under the action of the drilling fluid and compresses the non-magnetic spring. S2: Well inclination angle data measurement and processing. The mud pump is turned off. The vibration sensor detects that the drill string vibration signal is rapidly attenuated. The data processor determines that the signal is the trigger signal to start well inclination angle measurement. The magnetic field generator is powered on and the magnetorheological fluid is in a solid state. At the same time, the inclination sensor measures the well inclination angle data and transmits it to the data processor. The data processor processes the well inclination angle data. S3: Well inclination angle data encoding. The well inclination angle data is assigned and stored in the data processor using a timer interrupt function. S4: Well inclination angle data transmission, the mud pump is turned on after a delay and the magnetic field generator is intermittently powered off twice, and the well inclination angle data is transmitted to the surface in the form of drilling fluid pressure pulses; S5: After the pressure pulse signal transmission is completed, the data processor controls the magnetic field generator to be powered off and the magnetorheological fluid to be in a liquid state, so that the vertical well inclination measurement system enters the dormant state again. S6: The surface pressure gauge receives the well inclination signal. When the drilling fluid pressure pulse signal returns to the surface with the drilling fluid, the surface pressure gauge receives the drilling fluid pressure pulse signal and transmits it to the lower-level machine. S7: Well inclination angle data decoding. After the lower-level computer receives the drilling fluid pressure pulse signal, it decodes it according to the encoding rules to obtain the value of the well inclination angle. S8: Upper computer display and ground operation early warning. It outputs the well inclination angle value to the upper computer for staff to view. When the well inclination angle value exceeds the threshold, an alarm is issued, which then interrupts drilling operations or corrects the well trajectory.

[0014] The following are further optimizations and / or improvements to the second technical solution of the above invention: The above-mentioned S2 specifically includes the following steps: S21: Mud pump is shut down; S22: Inclination sensor measures well inclination angle data; S23: Data processor processes well inclination angle data; S24: Magnetic field generator is powered on; S25: Magnetorheological fluid is solidified.

[0015] In S3 above, the encoding of the well inclination angle data is achieved by assigning the interval between two timer interrupts to the timer interrupt program. The data processor controls the high-level timer to complete the interrupt operation. The encoding method is as follows: the well inclination angle is t degrees, and the interval between two very short interrupt times is nt seconds. The power on and power off of the magnetic field generator is controlled by the timer interrupt function, thereby controlling the generation and disappearance of the electromagnetic field around the magnetic field generator, and thus controlling the state of the magnetorheological fluid.

[0016] In S4 above, after the mud pump is turned on with a delay, the drilling fluid pressure increases. Since the magnetorheological fluid solidifies after the magnetic field generator is energized, the valve head cannot retract under the impact of the drilling fluid pressure. When the magnetic field generator is de-energized, the magnetic field disappears and the magnetorheological fluid instantly returns to a liquid state. At this time, the valve head instantly retracts a certain distance downward. Immediately afterward, the magnetic field generator is powered on again, the magnetic field is restored, the magnetorheological fluid becomes solid, and the valve head no longer retracts. According to the coding result in S3, after the energization time reaches nt, the magnetic field generator is de-energized again and the valve head retracts again. The retraction of the valve head will cause a change in the flow area, thereby causing an instantaneous change in pressure. Each retraction will form a falling edge in the pressure signal measured on the ground.

[0017] In S7 above, the decoding of well inclination angle data is based on the pressure pulse signal measured by the surface pressure gauge in S6. The decoding method is as follows: after the drilling fluid pressure pulse is measured on the surface, since the pulse signal contains two falling edges, the well inclination angle value is calculated based on the time interval between the two falling edges after A / D conversion.

[0018] This invention features a reasonable and compact structure, and is easy to use. By setting a throttling surface and cooperating with valve heads at different positions, the flow area between the valve head and the throttling sleeve changes, thus causing a change in the drilling fluid pressure measured on the surface. By switching the magnetic field generator on and off, the state of the magnetorheological fluid is changed. When the magnetic field generator is energized, the magnetorheological fluid changes from a liquid to a solid state, thus preventing the valve head from retracting and preventing the flow area between the valve head and the throttling sleeve from changing. When the magnetic field generator is de-energized, the magnetorheological fluid changes from a solid to a liquid state, allowing the valve head to retract and changing the flow area between the valve head and the throttling sleeve. It has the characteristics of stability, reliability, and fast response. Attached Figure Description

[0019] Appendix Figure 1 This is a schematic diagram of the front sectional view of the upper half of Embodiments 1 to 5 of the present invention.

[0020] Appendix Figure 2 This is a schematic diagram of the main sectional view of the lower half of Embodiments 1 to 5 of the present invention.

[0021] Appendix Figure 3 For the appendix Figure 1 A three-dimensional structural diagram of the intermediate transition section and connecting neck.

[0022] Appendix Figure 4 For the appendix Figure 1 A three-dimensional structural diagram of the valve head and valve stem.

[0023] Appendix Figure 5 For the appendix Figure 1 A three-dimensional structural diagram of the magnetorheological fluid assembly.

[0024] Appendix Figure 6 For the appendix Figure 1 A three-dimensional structural diagram of the wear-resistant sleeve.

[0025] Appendix Figure 7 For the appendix Figure 1 A three-dimensional structural diagram of the circuit board and circuit frame.

[0026] Appendix Figure 8 For the appendix Figure 1 A three-dimensional structural diagram of the lithium battery and the fixed frame.

[0027] Appendix Figure 9 For the appendix Figure 1 A three-dimensional structural diagram of the transition connector.

[0028] Appendix Figure 10 For the appendix Figure 1 A structural diagram in use.

[0029] Appendix Figure 11 For the appendix Figure 1 The flowchart.

[0030] Appendix Figure 12 For the appendix Figure 11 The schematic diagram of S2.

[0031] Appendix Figure 13 For the appendix Figure 11 The schematic diagram of S3.

[0032] Appendix Figure 14 For the appendix Figure 11 The schematic diagram of S6 and S7.

[0033] Appendix Figure 15 For the appendix Figure 14 Schematic diagram of drilling fluid pressure changes Figure 1 .

[0034] Appendix Figure 16 For the appendix Figure 14 Schematic diagram of drilling fluid pressure changes Figure 2 .

[0035] The codes in the attached diagram are as follows: 1 for upper connector, 2 for transition section, 3 for connecting neck, 4 for throttling sleeve, 5 for valve head, 6 for valve stem, 7 for valve sleeve, 8 for outer sleeve, 9 for first limiting ring, 10 for flow hole, 11 for top cap, 12 for non-magnetic spring, 13 for bottom cap, 14 for support sleeve, 15 for wear-resistant sleeve, 16 for piston cap, 17 for balance spring, 18 for adapter, 19 for first flow hole, 20 for second limiting ring, 21 for third limiting ring, 22 for second flow hole, 23 for balance chamber, 24 for balance hole, and 25 for generator body. 26 is the magnetorheological tube, 27 is the iron core, 28 is the coil, 29 is the measuring outer cylinder, 30 is the circuit frame, 31 is the circuit board, 32 is the fixing frame, 33 is the lithium battery, 34 is the end cap, 35 is the first wiring hole, 36 is the power line, 37 is the pressure-bearing sealing plug, 38 is the plug, 39 is the fluid-changing hole, 40 is the magnetorheological fluid, 41 is the second wiring hole, 42 is the upper notch, 43 is the wiring vertical groove, 44 is the lower notch, 45 is the upper flow passage hole, 46 is the throttling surface, 47 is the lower flow passage hole, 48 is the O-ring seal, 49 is the sheath ring groove, and 50 is the flow guide valve. Detailed Implementation

[0036] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0037] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0038] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1: As shown in the attached document Figures 1 to 11As shown, the vertical well inclination measurement device for high-temperature and high-pressure environments includes an upper connector 1, a transition sub 2, a connecting neck 3, a throttling sleeve 4, a valve head 5, a valve stem 6, a valve sleeve 7, an outer casing 8, a magnetorheological fluid 40 assembly, and a measuring sub. The upper connector 1 has a first limiting ring 9 on its upper inner side, and a transition sub 2 is fixedly installed on its lower inner side. The transition sub 2 has a vertically penetrating mounting hole in its center. At least one vertically penetrating flow hole 10 is provided on the transition sub 2 corresponding to the outer position of the mounting hole. A connecting neck 3 is provided on the lower side of the transition sub 2 corresponding to the mounting hole position. A throttling sleeve 4 is installed on the upper connector 1 at the position between the first limiting ring 9 and the transition sub 2. A valve head 5 is provided on the inner side of the upper part of the sleeve 4. A valve stem 6 is provided at the lower end of the valve head 5, with its lower end located below the throttling sleeve 4. A throttling curved surface 46 is provided on the inner side of the throttling sleeve 4 corresponding to the position of the valve head 5. A valve sleeve 7 is provided on the outer side of the middle part of the valve stem 6. A sleeve annular groove 49 is provided on the lower side of the valve head 5 corresponding to the position of the valve sleeve 7. The lower end of the valve sleeve 7 is fixedly installed on the inner side of the transition short section 2. An outer casing 8 is fixedly installed on the outer side of the lower part of the connecting neck 3. A magnetorheological fluid 40 assembly is provided inside the outer casing 8, which can adjust the flow area of ​​drilling fluid at the valve head 5 and the throttling curved surface 46. The magnetorheological fluid 40 assembly includes a top cap 11, a non-magnetic spring 12, a bottom cap 13, a magnetic field generator, a support sleeve 14, a wear-resistant sleeve 15, and a piston cap 16. A balance spring 17 and a conversion connector 18 are provided. The lower end of the valve stem 6 is fixedly installed together with the upper end of the top cap 11. A bottom cap 13 is provided on the inner side of the upper part of the outer casing 8 corresponding to the position below the top cap 11. The bottom cap 13 has a first flow hole 19 that runs vertically through it. A non-magnetic spring 12 is provided between the top cap 11 and the bottom cap 13. A conversion connector 18 with its lower end located below it is fixedly installed on the inner side of the lower end of the outer casing 8. A wear-resistant sleeve 15 is fixedly installed on the outer side of the upper end of the conversion connector 18. A second limiting ring platform 20 is provided on the inner side of the upper end of the wear-resistant sleeve 15. A piston cap 16 is provided on the inner side of the upper part of the 15 corresponding to the position below the second limiting ring platform 20. A balance spring 17 is provided between the piston cap 16 and the conversion connector 18. A magnetorheological fluid 40 is provided inside the outer casing 8, which corresponds to the position between the top cap 11 and the piston cap 16. A third limiting ring platform 21 is provided on the inner side of the middle part of the outer casing 8. A magnetic field generator that can change the state of the magnetorheological fluid 40 is provided on the third limiting ring platform 21. A second flow hole 22 is provided on the magnetic field generator. A support sleeve 14 is provided between the upper end of the magnetic field generator and the lower end of the bottom cap 13. A balance cavity 23 is provided inside the wear-resistant sleeve 15, which corresponds to the position between the piston sleeve and the conversion joint 18. A balance hole 24 that can communicate with the balance cavity 23 is provided on the outer side of the lower end of the conversion joint 18. A measuring sub is fixedly installed at the lower end of the conversion joint 18. A vibration sensor, an inclination sensor and a data processor are provided inside the measuring sub.In use, this invention is used in conjunction with existing known mud pumps, surface pressure gauges, lower-level and upper-level computers. The invention is installed in the middle of the oil and gas well drill string. During normal drilling, the magnetic field generator is de-energized and the magnetorheological fluid 40 is in a liquid state. The mud pump is turned on, and the drilling fluid in the drill string circulates. The valve head 5 moves downward under the action of the drilling fluid and compresses the non-magnetic spring 12. When well inclination angle data measurement is required, the mud pump is turned off. The vibration sensor detects a sharp attenuation of the drill string vibration signal. The data processor determines this signal as the trigger signal to start well inclination angle measurement. The magnetic field generator is energized, and the magnetorheological fluid 40 is in a solid state. Simultaneously, the inclination sensor measures the well inclination angle data and transmits it to the data processor. The data processor processes the well inclination angle data. The well inclination angle data is processed using a timed interrupt function. The data is stored in the data processor. The well inclination angle data is transmitted to the surface in the form of drilling fluid pressure pulses by delaying the start of the mud pump and intermittently cutting off the power to the magnetic field generator twice. After the pressure pulse signal is transmitted, the data processor controls the magnetic field generator to be powered off and the magnetorheological fluid 40 to be in a liquid state. The surface pressure gauge receives the well inclination signal. When the drilling fluid pressure pulse signal returns to the surface with the drilling fluid, the surface pressure gauge receives the drilling fluid pressure pulse signal and transmits it to the lower computer. After receiving the drilling fluid pressure pulse signal, the lower computer decodes it according to the encoding rules to obtain the value of the well inclination angle. The value of the well inclination angle is output to the upper computer for the staff to view. When the value of the well inclination angle exceeds the threshold, an alarm is issued, thereby interrupting the drilling operation or correcting the well trajectory.

[0039] This invention features a reasonable and compact structure, and is easy to use. By setting a throttling surface 46, which cooperates with valve heads 5 at different positions, the flow area between valve head 5 and throttling sleeve 4 changes, thus causing a change in the drilling fluid pressure measured on the ground. By switching the magnetic field generator on and off, the state of the magnetorheological fluid 40 is changed. When the magnetic field generator is energized, the magnetorheological fluid 40 changes from a liquid state to a solid state, so that valve head 5 cannot retract, and the flow area between valve head 5 and throttling sleeve 4 cannot be changed. When the magnetic field generator is de-energized, the magnetorheological fluid 40 changes from a solid state to a liquid state, so that valve head 5 can retract, and the flow area between valve head 5 and throttling sleeve 4 can be changed. It has the characteristics of stability, reliability and fast response.

[0040] In addition, the upper end of the upper connector may be equipped with a known flow guide valve 50.

[0041] Compared with the prior art, the beneficial effects of the present invention are: (1) In the prior art, well inclination measurement is performed by a single-point inclination meter or a MWD inclination meter, which is complicated to operate. In contrast, the operation of the present invention is more convenient and can realize measurement while drilling; (2) The present invention uses magnetorheological fluid 40 to control the extension and retraction of valve head 5. Since the solid-liquid conversion speed of magnetorheological fluid 40 is in the millisecond range, the present invention has the advantages of low delay and fast response in controlling the pulse generator; (3) The present invention uses the weakening of the vibration signal received by the vibration sensor caused by the pump stop as the trigger signal for starting the inclination measurement device. It automatically enters sleep mode when normal drilling and inclination measurement are completed, which has the advantages of low power consumption and avoids the problem of difficult transmission of trigger signal during deep well operation; (4) The device of the present invention is placed inside the drill collar, without continuous high-frequency moving parts or high-speed dynamic seals, which can avoid the situation of heat generation caused by friction between the drill string and the well wall and friction between the drill bit and the formation. The fluid flowing through the device can play a cooling role. Therefore, the device is suitable for high temperature and high pressure drilling environment.

[0042] The above-mentioned vertical well inclination measurement device for high-temperature and high-pressure environments can be further optimized and / or improved according to actual needs: Example 2: As shown in the attached document Figures 1 to 9 As shown, the magnetic field generator includes a generator body 25, a magnetorheological tube 26, an iron core 27, and a coil 28. An upper outer ring platform is located on the outer side of the upper end of the generator body 25, and a lower outer ring platform is located on the outer side of the lower end of the generator body 25. At least two vertically penetrating upper magnetorheological holes are spaced along the circumference of the upper outer ring platform. A vertically penetrating lower magnetorheological hole is located on the lower outer ring platform corresponding to each upper magnetorheological hole. A magnetorheological tube 26 is fixedly installed between every two corresponding upper and lower magnetorheological holes. An iron core 27 is located on the outer side of the generator body 25 at a position between the upper and lower outer ring platforms, and a coil 28 is wound around the outer side of the iron core 27. During use, the state of the magnetorheological fluid 40 is changed by energizing the coil 28 to generate magnetism.

[0043] Example 3: As shown in the attached document Figures 1 to 9 As shown, the measuring section includes a measuring outer cylinder 29, a circuit frame 30, a circuit board 31, a fixing frame 32, a lithium battery 33, and an end cap 34. The lower end of the adapter 18 is fixedly installed on the inner side of the upper end of the measuring outer cylinder 29, and the end cap 34 is fixedly installed on the inner side of the lower end of the measuring outer cylinder 29. Inside the measuring outer cylinder 29, from top to bottom, are arranged a vibration sensor, a tilt sensor, a circuit frame 30, and a fixing frame 32. The circuit frame 30 contains the circuit board 31, which has a data processor. The fixing frame 32 contains the lithium battery 33. The coil 28, the vibration sensor, and the tilt sensor are all connected to the circuit board 31. This design ensures both power supply and airtightness during use.

[0044] Example 4: As shown in the appendix Figures 1 to 9As shown, it also includes a power line 36, a pressure-bearing sealing plug 37, and a plug 38. The lower end of the generator body 25 is provided with a first wiring hole 35. The outer side of the wear-resistant sleeve 15 is provided with a vertically penetrating wiring groove 43. The upper end of the wear-resistant sleeve 15 is provided with an upper notch 42 corresponding to the upper position of the wiring groove 43, and the lower end of the wear-resistant sleeve 15 is provided with a lower notch 44 corresponding to the lower position of the wiring groove 43. The lower center of the conversion connector 18 is provided with a blind mounting hole. The pressure-bearing sealing plug 37 is provided in the blind mounting hole. The second wiring hole 41, which can communicate with the lower notch 44, is provided in the blind mounting hole. The first end of the power line 36 passes through the first wiring hole 35 and connects to the coil 28. The second end of the power line 36 passes through the upper notch 42, the wiring groove 43, the lower notch 44, and the second wiring hole 41 in sequence and then enters the pressure-bearing sealing plug 37. The lower outer side of the conversion connector 18 is provided with a fluid-changing hole 39 that can communicate with the second wiring hole 41. The inner side of the outer end of the fluid-changing hole 39 is provided with a plug 38. During use, this setting facilitates the control of power supply to and from the magnetic field generator.

[0045] Example 5: As shown in the attached document Figures 1 to 9 As shown, the throttling sleeve 4 has an upper flow passage 45, a middle flow passage, and a lower flow passage 47 connected sequentially from top to bottom in the middle part. The middle flow passage has a throttling curved surface 46 that is narrower at the top and wider at the bottom. A valve stem 6 is provided inside the throttling sleeve 4, and a valve head 5 is provided at the upper end of the valve stem 6. The upper end of the valve head 5 has a conical surface that is smaller at the top and larger at the bottom. During use, this arrangement allows the throttling sleeve 4 and the valve head 5 to form a throttling unit. When the valve head 5 moves, the flow area between the valve head 5 and the throttling sleeve 4 changes, causing the drilling fluid pressure measured on the surface to change as well.

[0046] Example 6: As shown in the appendix Figures 1 to 9 As shown, it also includes O-ring seals 48. O-ring seals 48 are provided between the top cap 11 and the connecting neck 3, between the top cap 11 and the outer protective sleeve 8, between the piston cap 16 and the wear-resistant sleeve 15, between the adapter 18 and the wear-resistant sleeve 15, and between the adapter 18 and the outer protective sleeve 8. This arrangement ensures the sealing between the components during use.

[0047] Example 7: As attached Figures 1 to 9 As shown, the top cap 11 has a downward-opening upper blind hole at its lower end, and the bottom cap 13 has an upward-opening lower blind hole at its upper end. The upper end of the non-magnetic spring 12 is located in the upper blind hole, and the lower end of the non-magnetic spring 12 is located in the lower blind hole. This design facilitates the compression of the non-magnetic spring 12 and its return to its original position during use.

[0048] Example 8: As attached Figures 1 to 16 As shown, a method for vertical well surveying using the above-mentioned vertical well surveying device for high-temperature and high-pressure environments includes the following steps: S1: Provides a vertical well surveying system, which includes a high-temperature and high-pressure environment vertical well surveying device, a surface pressure gauge, a lower-level computer, and a higher-level computer. The high-temperature and high-pressure environment vertical well surveying device is installed in the middle of the oil and gas well drill string. During normal drilling, the magnetic field generator is de-energized and the magnetorheological fluid 40 is in a liquid state, so that the vertical well surveying system enters a dormant state. The mud pump is turned on, the drilling fluid in the drill string circulates, and the valve head 5 moves downward under the action of the drilling fluid and compresses the non-magnetic spring 12.

[0049] The drill string refers to a hollow tubing that extends from the ground to the bottom of the well, which can transmit power and serve as a flow channel for drilling fluid.

[0050] The mud pump is a power unit located on the ground used to circulate drilling fluid.

[0051] The throttling sleeve 4 and the valve head 5 form a throttling unit. When the valve head 5 moves, the flow area between the valve head 5 and the throttling sleeve 4 changes, causing the drilling fluid pressure measured on the ground to also change.

[0052] Power lines 36 are provided between the vibration sensor and the data processor, the inclinometer and the data processor, and the data processor and the magnetic field generator. The power supply device supplies power to the vibration sensor, the inclinometer, the data processor, and the magnetic field generator.

[0053] The mud pump is in the open state, and the valve head 5 is compressed to the lowest limit position of the non-magnetic spring 12 under the impact of the drilling fluid. At this time, the power supply device of the entire vertical well inclination measurement system only supplies power to the electrical components on the circuit skeleton 30. The electrical components such as the inclination sensor and the magnetic field generator are in a dormant state because they have not received the trigger signal from the data processor. The power consumption is extremely low, and the main power consumption part is the vibration sensor part.

[0054] S2: Well inclination angle data measurement and processing. The mud pump is turned off. The vibration sensor detects that the drill string vibration signal is rapidly attenuating. The data processor determines that the signal is the trigger signal to start well inclination angle measurement. The magnetic field generator is powered on and the magnetorheological fluid 40 is in a solid state. At the same time, the inclination sensor measures the well inclination angle data and transmits it to the data processor. The data processor processes the well inclination angle data.

[0055] Vibration signal intensity attenuation monitoring involves determining the inclination measurement operation by analyzing the difference between two data acquisitions from the vibration sensor after the vibration signal is converted from an A / D converter. If the operation is determined to be a shutdown of the mud pump on the ground, the determination result serves as the trigger signal for the processor to initiate inclination measurement to the vertical well inclination measurement system.

[0056] Specifically, the steps are as follows: S21: Mud pump is shut down; S22: Inclination sensor measures well inclination angle data; S23: Data processor processes well inclination angle data; S24: Magnetic field generator is powered on; S25: Magnetorheological fluid 40 is cured.

[0057] Step S22 is executed after receiving the trigger signal from step S21. Step S23 is to collect and process the well inclination angle data measured by the inclination sensor in step S22. At the same time, step S24 is also executed after receiving the trigger signal from step S21 to start powering the magnetic field generator. Step S25 is executed immediately after powering the magnetic field generator in step S24.

[0058] Step S23 involves acquiring the results measured by the inclinometer sensor in step S22 and then performing A / D conversion.

[0059] After the mud pump is shut down in step S1 before step S24, the drilling fluid pressure decreases, and the valve head 5 returns to its initial position under the action of the non-magnetic spring 12, that is, the position where the flow area of ​​the valve head 5 is the smallest. After the magnetic field generator is powered in step S24, a magnetic field will be generated around the device and act on the magnetorheological fluid 40.

[0060] In step S25, the magnetorheological fluid 40, due to its inherent high-speed response, will instantly change from a liquid state to a solid state, and the magnetorheological fluid 40 remains solid when the magnetic field generator is energized.

[0061] The magnetorheological fluid 40 is a micron-scale magnetizable suspension system that can change its material state within milliseconds under the action of an external magnetic field.

[0062] S3: Well inclination angle data encoding. The well inclination angle data is assigned and stored in the data processor using a timer interrupt function.

[0063] The well inclination angle data encoding in step S3 begins after receiving the well inclination angle calculated in step S23. The encoding of the well inclination angle data is achieved by assigning the interval between two timer interrupts to the timer interrupt program. The data processor controls the high-level timer to complete the interrupt operation. The specific encoding method is as follows: the well inclination angle is t degrees, and the interval between two very short interrupt times is nt seconds, where n is a positive number.

[0064] In step S3, the timer interrupt function controls the power-on and power-off of the magnetic field generator, thereby generating and eliminating the electromagnetic field around the magnetic field generator, and thus controlling the state of the magnetorheological fluid 40.

[0065] S4: Well inclination angle data transmission. The mud pump is turned on after a delay and the magnetic field generator is intermittently powered off twice to transmit the well inclination angle data to the surface in the form of drilling fluid pressure pulses.

[0066] Specifically, the steps include: S41: Start the mud pump to transmit drilling fluid pressure pulse signals; S42: Intermittently cut off the power to the magnetic field generator twice.

[0067] Step S41 is executed after a delay following the completion of step S3. The specific delay duration is based on the total duration of the program's ground simulation operation plus the tolerance duration.

[0068] Step S42 is performed under the control of the coding program in step S3. The effect of step S42 is as follows: After the mud pump is turned on after a delay in step S41, the drilling fluid pressure increases. Since the magnetorheological fluid 40 solidifies after the magnetic field generator is powered on, the valve head 5 cannot retract under the impact of the drilling fluid pressure. When the magnetic field generator is powered off, the magnetic field disappears and the magnetorheological fluid 40 instantly returns to a liquid state. At this time, the valve head 5 instantly retracts a certain distance downward. Then, the magnetic field generator immediately restores the power supply, the magnetic field is restored, the magnetorheological fluid 40 becomes solid, and the valve head 5 no longer continues to retract. According to the coding result in S3, after the power-on time reaches nt, the magnetic field generator is powered off again and the valve head 5 retracts again. The retraction of the valve head 5 will cause a change in the flow area, thereby causing an instantaneous change in pressure. Each retraction will form a falling edge in the pressure signal measured on the ground.

[0069] S5: After the pressure pulse signal transmission is completed, the data processor controls the magnetic field generator to be powered off and the magnetorheological fluid 40 to be in a liquid state, so that the vertical well inclination measurement system enters the dormant state again.

[0070] Step S5, in which the vertical well inclination measurement system enters a dormant state, is executed after the timed interrupt program in step S3 has finished running. That is, after the electrical components such as the inclination sensor and the magnetic field generator have completed this round of measurement, the system enters a dormant state. In this dormant state, the power supply only supplies power to the electrical components on the circuit frame 30, and the power consumption is extremely low. The main power-consuming part is the vibration sensor.

[0071] S6: The surface pressure gauge receives the well inclination signal. When the drilling fluid pressure pulse signal returns to the surface with the drilling fluid, the surface pressure gauge receives the drilling fluid pressure pulse signal and transmits it to the lower-level machine.

[0072] In step S6, the surface pressure gauge is used to measure the drilling fluid pressure.

[0073] S7: Well inclination angle data decoding. After the lower-level computer receives the drilling fluid pressure pulse signal, it decodes it according to the encoding rules to obtain the value of the well inclination angle.

[0074] In S7, the decoding of well inclination angle data is based on the pressure pulse signal measured by the surface pressure gauge in S6. The decoding method is as follows: after the drilling fluid pressure pulse is measured on the surface, since the pulse signal contains two falling edges, the well inclination angle value is calculated based on the time interval between the two falling edges after A / D conversion.

[0075] S8: Upper computer display and ground operation early warning. It outputs the well inclination angle value to the upper computer for staff to view. When the well inclination angle value exceeds the threshold, an alarm is issued, which then interrupts drilling operations or corrects the well trajectory.

[0076] S8 is to transmit the well inclination angle data to the host computer for display after the decoding is completed in step S7, and set the alarm threshold. After the alarm threshold is triggered, the subsequent interrupt or correction procedure is executed.

[0077] Example 9: As attached Figures 10 to 16 As shown, this invention provides a method for vertical well inclination measurement in high-temperature and high-pressure environments. In step S6, the drilling fluid pressure pulse signal diagram obtained by the surface pressure gauge is shown below. Figure 15 As shown, firstly, after the data processor controls the magnetic field generator to be powered off twice, the valve head 5 retracts, causing a change in the throttling area, thereby generating a drilling fluid pressure pulse. The surface pressure gauge receives the pulse as the drilling fluid returns to the surface. Figure 15 After the drilling fluid pressure pulse shown, there are two falling edges. When the GPIO port of the lower computer captures the first falling edge, it triggers the advanced timer to start counting. When the second falling edge is captured, the advanced timer stops counting. The counting time is Δt, and the value corresponding to Δt is the measured well inclination angle data.

[0078] Example 10: As attached Figure 16 As shown, further, when the GPIO port of the lower-level machine captures the first falling edge, the corresponding time is t=13s, triggering the advanced timer to start counting. When the second falling edge is captured, the corresponding time is t=14.5s, the advanced timer stops counting. The counting time is Δt=1.5s, and its specific value is 1.5. Then 1.5 is the measured well inclination angle data, that is, the measured well inclination angle is 1.5 degrees.

[0079] The above technical features constitute the preferred embodiment of the present invention, which has strong adaptability and optimal implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A vertical well inclination measuring device for use in high-temperature and high-pressure environments, characterized in that... The system includes an upper connector, a transition section, a connecting neck, a throttling sleeve, a valve head, a valve stem, a valve sleeve, an outer casing, a magnetorheological fluid assembly, and a measuring section. The upper connector has a first limiting ring on its upper inner side, and a transition section is fixedly installed on the lower inner side of the upper connector. The transition section has a through-hole in its center, and at least one through-flow hole on the outer side of the corresponding mounting hole. A connecting neck is located on the lower side of the transition section corresponding to the mounting hole. A throttling sleeve is installed inside the upper connector at the position between the first limiting ring and the transition section. The upper part of the throttling sleeve... A valve head is provided on the side, and a valve stem is located at the lower end of the valve head, below the throttling sleeve. A throttling surface is provided on the inner side of the throttling sleeve corresponding to the valve head position. A valve sleeve is provided on the outer side of the middle part of the valve stem, and a sleeve annular groove is provided on the lower side of the valve head corresponding to the valve sleeve position. The lower end of the valve sleeve is fixedly installed on the inner side of the transition short section. An outer casing is fixedly installed on the outer side of the lower part of the connecting neck. A magnetorheological fluid assembly is provided inside the outer casing, which can adjust the flow area of ​​drilling fluid at the valve head and the throttling surface. The magnetorheological fluid assembly includes a top cap, a non-magnetic spring, a bottom cap, a magnetic field generator, a support sleeve, a wear-resistant sleeve, a piston cap, and a balance spring. The valve stem and adapter are fixedly installed together at the lower end and the upper end of the top cap. A bottom cap is located on the inner side of the upper part of the outer casing below the top cap. The bottom cap has a first through-hole. A non-magnetic spring is located between the top cap and the bottom cap. An adapter is fixedly installed on the inner side of the lower end of the outer casing. A wear-resistant sleeve is fixedly installed on the outer side of the upper end of the adapter. A second limiting ring is located on the inner side of the upper end of the wear-resistant sleeve. A piston cap is located on the inner side of the upper part of the wear-resistant sleeve below the second limiting ring. A balance spring is located between the piston cap and the adapter. A balance spring is located between the piston cap and the adapter. The outer casing between the plug and the cap contains magnetorheological fluid. A third limiting ring is located on the inner side of the middle of the outer casing. A magnetic field generator capable of changing the state of the magnetorheological fluid is located on the third limiting ring. The magnetic field generator has a second flow hole. A support sleeve is located between the upper end of the magnetic field generator and the lower end of the bottom cap. A balance chamber is located in the wear-resistant sleeve corresponding to the position between the piston sleeve and the conversion joint. A balance hole that can communicate with the balance chamber is located on the outer side of the lower end of the conversion joint. A measuring section is fixedly installed at the lower end of the conversion joint. A vibration sensor, an inclination sensor, and a data processor are located inside the measuring section.

2. The vertical well inclination measuring device for high temperature and high pressure environments according to claim 1, characterized in that... The magnetic field generator includes a generator body, a magnetoresistive tube, an iron core, and a coil. An upper outer ring platform is provided on the outer side of the upper end of the generator body, and a lower outer ring platform is provided on the outer side of the lower end of the generator body. At least two vertically penetrating upper magnetoresistive holes are provided on the upper outer ring platform at intervals along the circumference. A vertically penetrating lower magnetoresistive hole is provided on the lower outer ring platform corresponding to the position of each upper magnetoresistive hole. A magnetoresistive tube is fixedly installed between each pair of corresponding upper and lower magnetoresistive holes. An iron core is provided on the outer side of the generator body at the position between the upper and lower outer ring platforms, and a coil is wound on the outer side of the iron core.

3. The vertical well inclination measuring device for high temperature and high pressure environments according to claim 2, characterized in that... The measuring section includes a measuring outer cylinder, a circuit frame, a circuit board, a fixing frame, a lithium battery, and an end cap. The lower end of the adapter is fixedly installed on the inner side of the upper end of the measuring outer cylinder, and the end cap is fixedly installed on the inner side of the lower end of the measuring outer cylinder. Inside the measuring outer cylinder, from top to bottom, there are a vibration sensor, a tilt sensor, a circuit frame, and a fixing frame. The circuit frame contains a circuit board, and the circuit board contains a data processor. The fixing frame contains a lithium battery. The coil, vibration sensor, and tilt sensor are all connected to the circuit board.

4. The vertical well inclination measuring device for high temperature and high pressure environments according to claim 3, characterized in that... It also includes a power line, a pressure-bearing sealing plug, and a plug. The lower end of the generator body is provided with a first wiring hole. The outer side of the wear-resistant sleeve is provided with a vertically penetrating wiring groove. The upper end of the wear-resistant sleeve is provided with an upper notch corresponding to the upper position of the wiring groove, and the lower end of the wear-resistant sleeve is provided with a lower notch corresponding to the lower position of the wiring groove. The lower center of the conversion connector is provided with a blind mounting hole. The blind mounting hole is provided with a pressure-bearing sealing plug. The blind mounting hole is provided with a second wiring hole that can communicate with the lower notch. The first end of the power line passes through the first wiring hole and connects to the coil. The second end of the power line passes through the upper notch, the wiring groove, the lower notch, and the second wiring hole in sequence and then enters the pressure-bearing sealing plug. The lower outer side of the conversion connector is provided with a fluid-changing hole that can communicate with the second wiring hole. The inner side of the outer end of the fluid-changing hole is provided with a plug.

5. The vertical well inclination measuring device for high temperature and high pressure environments according to claim 1, 2, 3, or 4, characterized in that... The throttling sleeve has an upper flow passage, a middle flow passage, and a lower flow passage connected sequentially from top to bottom in the middle part. The middle flow passage has a throttling curved surface that is narrow at the top and wide at the bottom. A valve stem is provided inside the throttling sleeve, and a valve head is provided at the upper end of the valve stem. The upper end of the valve head has a conical surface that is smaller at the top and larger at the bottom. Or / and, it also includes O-rings, with an O-ring between the top cap and the connecting neck, an O-ring between the top cap and the outer protective sleeve, an O-ring between the piston cap and the wear-resistant sleeve, an O-ring between the adapter and the wear-resistant sleeve, and an O-ring between the adapter and the outer protective sleeve. Or / and, the lower end of the top cap has an upper blind hole that opens downwards, and the upper end of the bottom cap has a lower blind hole that opens upwards. The upper end of the non-magnetic spring is located in the upper blind hole, and the lower end of the non-magnetic spring is located in the lower blind hole.

6. A method for vertical well surveying using a vertical well surveying device for high-temperature and high-pressure environments as described in any one of claims 1 to 5, characterized in that... The steps include the following: S1: Provides a vertical well surveying system, which includes a vertical well surveying device for high-temperature and high-pressure environments, a surface pressure gauge, a lower-level computer, and a higher-level computer. The vertical well surveying device for high-temperature and high-pressure environments is installed in the middle of the oil and gas well drill string. During normal drilling, the magnetic field generator is de-energized and the magnetorheological fluid is in a liquid state, which puts the vertical well surveying system into a dormant state. The mud pump is turned on, the drilling fluid in the drill string circulates, and the valve head moves downward under the action of the drilling fluid and compresses the non-magnetic spring. S2: Well inclination angle data measurement and processing. The mud pump is turned off. The vibration sensor detects that the drill string vibration signal is rapidly attenuated. The data processor determines that the signal is the trigger signal to start well inclination angle measurement. The magnetic field generator is powered on and the magnetorheological fluid is in a solid state. At the same time, the inclination sensor measures the well inclination angle data and transmits it to the data processor. The data processor processes the well inclination angle data. S3: Well inclination angle data encoding. The well inclination angle data is assigned and stored in the data processor using a timer interrupt function. S4: Well inclination angle data transmission, the mud pump is turned on after a delay and the magnetic field generator is intermittently powered off twice, and the well inclination angle data is transmitted to the surface in the form of drilling fluid pressure pulses; S5: After the pressure pulse signal transmission is completed, the data processor controls the magnetic field generator to be powered off and the magnetorheological fluid to be in a liquid state, so that the vertical well inclination measurement system enters the dormant state again. S6: The surface pressure gauge receives the well inclination signal. When the drilling fluid pressure pulse signal returns to the surface with the drilling fluid, the surface pressure gauge receives the drilling fluid pressure pulse signal and transmits it to the lower-level machine. S7: Well inclination angle data decoding. After the lower-level computer receives the drilling fluid pressure pulse signal, it decodes it according to the encoding rules to obtain the value of the well inclination angle. S8: Upper computer display and ground operation early warning. It outputs the well inclination angle value to the upper computer for staff to view. When the well inclination angle value exceeds the threshold, an alarm is issued, which then interrupts drilling operations or corrects the well trajectory.

7. The vertical well inclination measurement method according to claim 6, characterized in that... S2 specifically includes the following steps: S21: Mud pump shut down; S22: Inclination sensor measures well inclination angle data; S23: Data processor processes well inclination angle data; S24: Magnetic field generator is powered on; S25: Magnetorheological fluid solidifies.

8. The method for measuring the inclination of a vertical well according to claim 6 or 7, characterized in that... In S3, the encoding of well inclination angle data is achieved by assigning the interval between two timer interrupts to the timer interrupt program. The data processor controls the high-level timer to complete the interrupt operation. The encoding method is as follows: the well inclination angle is t degrees, and the interval between two very short interrupt times is nt seconds. The power on and power off of the magnetic field generator is controlled by the timer interrupt function, thereby controlling the generation and disappearance of the electromagnetic field around the magnetic field generator, and thus controlling the state of the magnetorheological fluid.

9. The vertical well inclination measurement method according to claim 8, characterized in that... In S4, after the mud pump is turned on with a delay, the drilling fluid pressure increases. Because the magnetorheological fluid solidifies after the magnetic field generator is energized, the valve head cannot retract under the impact of the drilling fluid pressure. When the magnetic field generator is de-energized, the magnetic field disappears and the magnetorheological fluid instantly returns to a liquid state. At this time, the valve head instantly retracts a certain distance downward. Immediately afterward, the magnetic field generator is powered on again, the magnetic field is restored, the magnetorheological fluid becomes solid, and the valve head no longer retracts. According to the coding result in S3, after the energization time reaches nt, the magnetic field generator is de-energized again and the valve head retracts again. The retraction of the valve head will cause a change in the flow area, thereby causing an instantaneous change in pressure. Each retraction will form a falling edge in the pressure signal measured on the ground.

10. The method for measuring the inclination of a vertical well according to claim 6, 7, or 9, characterized in that... In S7, the decoding of well inclination angle data is based on the pressure pulse signal measured by the surface pressure gauge in S6. The decoding method is as follows: after the drilling fluid pressure pulse is measured on the surface, since the pulse signal contains two falling edges, the well inclination angle value is calculated based on the time interval between the two falling edges after A / D conversion.

11. The method for measuring the inclination of a vertical well according to claim 8, characterized in that... In S7, the decoding of well inclination angle data is based on the pressure pulse signal measured by the surface pressure gauge in S6. The decoding method is as follows: after the drilling fluid pressure pulse is measured on the surface, since the pulse signal contains two falling edges, the well inclination angle value is calculated based on the time interval between the two falling edges after A / D conversion.

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