Mechanical tool face angle measuring device

Abstract

The invention discloses a mechanical tool face angle measuring device which comprises an outer cylinder, an inner cylinder, a coding disc rotation control driving assembly, a coding disc and a valve block. An outer runner is formed between the inner cylinder and the outer cylinder; the coding disc rotation control driving assembly, the coding disc and the valve block are sequentially connected and installed in the inner cylinder. The valve block can rotate relative to the coding disc and stably point to the gravity direction, throttling holes are formed in the coding disc, and when the coding disc rotates relative to the valve block, part of the throttling holes can be blocked by the valve block. When the pumping pressure of the drilling fluid is small, the coding disc rotates to control the driving assembly to block the inner barrel, so that the drilling fluid passes through the outer flow channel; when the pumping pressure of drilling fluid is increased, the coding disc rotation control driving assembly opens the inner cylinder under the impact of high-pressure drilling fluid to enter the inner flow channel so as to drive the coding disc to rotate, so that different throttling holes are shielded by the valve block, different pressure waves are generated, and tool face angle measurement is achieved. The measuring device can be suitable for various severe working conditions such as high temperature and high pressure, and has the advantages of high reliability and long service life.

Description

Technical Field

[0001] The invention relates to the technical field of tool face measurement in a directional deflection process, and in particular to a mechanical tool face angle measuring device. Background Art

[0002] During the process of deflection, the directional deflection tool will deflect the drill bit's forward direction toward one side of the wellbore wall, and draw a direction line perpendicular to the axis of the drill string in the entire deflection direction. The plane formed by this direction line and the axis of the drill string is called the tool face. When the drill string reaches the bottom of the well, the angle between the tool face line of the deflection tool and the high side direction line is called the tool face angle. Different tool face angles will result in different directions of the newly drilled wellbore. Therefore, accurate measurement of the tool face angle of the directional tool is the key to directional drilling technology.

[0003] Traditional tool face angle measurement tools are mostly based on electronic components, and the normal operation of electronic components is limited by high temperature. The Chinese invention patent with application publication number CN114427433A discloses a downhole tool face measurement tool based on mechanical pressure regulation, which does not require electronic components and is used to measure the tool face position of directional joints in ultra-high temperature and high pressure deep formation directional drilling. The valve block of this tool always stably points to the low side under the control of the biased power mechanism. When the tool face angle needs to be measured, the outer tube of the drill bit drives the encoder disk with different sized throttle holes to rotate relative to the valve block that blocks some throttle holes, so that the valve block continuously opens and closes different throttle holes on the encoder disk, thereby forming a pressure wave signal on the ground to determine the current position of the tool face.

[0004] However, in this tool, the valve block connection is arranged at the bottom end of the center reinforcement rod, and the center reinforcement rod is rotationally connected to the outer cylinder through a bearing. Since the friction of the bearing cannot be eliminated, when the outer cylinder of the drill bit drives the encoding disk to rotate during the measurement process, a certain disturbance friction torque will be generated on the valve block through the bearing, making it impossible for the valve block to always stably point to the direction of gravity, resulting in errors in the measurement of the tool face angle and low measurement accuracy. Summary of the invention

[0005] The purpose of the present invention is to provide a new mechanical tool face angle measurement device to improve the accuracy of the measurement results in order to solve the problem that the tool face angle measurement method based on mechanical pressure regulation in the prior art causes large tool face angle measurement errors by driving the encoder disk to rotate as the outer cylinder of the downhole tool face measurement tool is used.

[0006] The technical solution of the present invention is described in detail as follows:

[0007] A mechanical tool face angle measuring device comprises an outer cylinder, an inner cylinder, a code disk rotation control drive assembly, a code disk and a valve block;

[0008] The inner cylinder is fixedly sleeved in the outer cylinder, the inner cylinder is enclosed to form an inner flow channel, and the inner cylinder and the outer cylinder are spaced to form an annular outer flow channel;

[0009] The encoder disk rotation control drive assembly, the encoder disk and the valve block are sequentially connected and installed in the inner cylinder;

[0010] The valve block stably points to the direction of gravity, the encoding disc is installed in the inner cylinder through a bearing and is close to the valve block and can rotate relative to the valve block, a plurality of throttle holes are opened in the circumference of the encoding disc, and when the encoding disc rotates relative to the valve block, some of the throttle holes will be blocked by the valve block;

[0011] When the drilling fluid pump pressure is in the first range, the encoder disk rotates to control the drive assembly to block the inner cylinder so that the drilling fluid passes through the outer flow channel;

[0012] When the drilling fluid pump pressure increases to the second range, the encoder disk rotation control drive assembly opens the inner tube and enters the inner flow channel under the impact of high-pressure drilling fluid to drive the encoder disk to rotate so that different throttling holes are blocked by the valve block, generating different pressure waves to achieve tool face angle measurement.

[0013] In some embodiments, the above-mentioned mechanical tool face angle measuring device, the encoder disk rotation control drive assembly includes a piston, a screw, a screw support and a first reset spring; the screw support is fixedly installed in the inner cylinder to support the screw and enable the screw to move in the axial direction, one end of the screw is fixedly connected to the piston, and the other end of the screw is connected to the encoder disk through a nut transmission; the inner wall of the inner cylinder is provided with a reset positioning shoulder, the first reset spring is sleeved on the screw and one end is in contact with the piston, and the other end is in contact with the screw support;

[0014] When the drilling fluid pump pressure is in the first range, the piston presses against the reset positioning shoulder under the elastic force of the first reset spring to seal the inner tube.

[0015] In some embodiments, the above-mentioned mechanical tool face angle measuring device also includes a screw assembly part, which is a columnar barrel structure. A nut is arranged at the center of the end away from the encoding disk for the screw to pass through, and the end close to the encoding disk is fixedly connected to the encoding disk. A second reset spring is connected between the end of the screw that passes through the nut and the encoding disk; when the piston drives the screw to move axially and compresses the second reset spring to the limit, it can drive the encoding disk to rotate. When the piston driving force disappears, the screw can rotate in the opposite direction and reset under the elastic force of the second reset spring.

[0016] In some embodiments, the above-mentioned mechanical tool face angle measuring device, the encoder disk rotation control drive assembly also includes a clutch, the clutch includes an input part and an output part whose end faces can mesh with each other, the screw includes an input screw and an output screw, wherein one end of the input screw is fixedly connected to the piston, and the other end is fixedly connected to the clutch input part, and one end of the output screw is fixedly connected to the clutch output part, and the other end is connected to the screw assembly part through a nut transmission;

[0017] When the drilling fluid pump pressure is in the first range, the input part and the output part of the clutch are separated;

[0018] When the drilling fluid pump pressure increases to the second range, the piston moves axially under the impact of the high-pressure drilling fluid to open the inner tube and drive the input part of the clutch to move and engage with the output part of the clutch, thereby driving the output screw to rotate to drive the encoder disk to rotate.

[0019] In some embodiments, the above-mentioned mechanical tool face angle measuring device also includes a screw assembly part, which is a columnar barrel structure. A nut is arranged at the center of the end away from the encoding disk for the output screw to pass through, and the end close to the encoding disk is fixedly connected to the encoding disk. A second reset spring is connected between the end of the output screw passing through the nut and the encoding disk; when the piston drives the output screw to move axially and compresses the second reset spring to the limit, it can drive the encoding disk to rotate. When the piston driving force disappears, the output screw can rotate in the opposite direction and reset under the elastic force of the second reset spring.

[0020] In some embodiments, the above-mentioned mechanical tool face angle measuring device, the encoder disk rotation control drive assembly includes a piston, a screw, a screw support and a second reset spring; the screw support is fixedly installed in the inner cylinder to support the screw and enable the screw to move in the axial direction, one end of the screw is fixedly connected to the piston, and the other end of the screw is connected to the encoder disk through a nut transmission; the inner wall of the inner cylinder is provided with a reset positioning shoulder, and the second reset spring is installed between the screw and the encoder disk;

[0021] When the drilling fluid pump pressure is in the first range, the screw rod moves away from the encoding disc under the elastic force of the second return spring, so that the piston at the other end of the screw rod presses against the return positioning shoulder to block the inner tube.

[0022] In some embodiments, the above-mentioned mechanical tool face angle measuring device also includes a screw assembly part, which is a columnar barrel structure. A nut is arranged at the center of the end away from the encoding disk for the output screw to pass through, and the end close to the encoding disk is fixedly connected to the encoding disk.

[0023] In certain embodiments, in the above-mentioned mechanical tool face angle measuring device, the valve block is connected to a weight-biased power mechanism, which is installed in the inner tube through a bearing and can drive the valve block to rotate. The weight-biased power mechanism uses its own weight-biased characteristics to drive the valve block to maintain a stable direction pointing in the direction of gravity.

[0024] In certain embodiments, in the mechanical tool face angle measuring device, the throttle holes have different sizes in area, and the size of the valve block is based on the ability to completely cover each throttle hole individually.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The mechanical tool face angle measuring device of the present invention continuously determines the change of the tool face angle through the mud pulse signal waveform generated each time the position of the encoder disk and the valve block changes. The entire device adopts a fully mechanical structure to measure the tool face angle, which can be applied to various harsh working conditions such as high temperature and high pressure, and has the advantages of high reliability and long service life.

[0027] 2. In the mechanical tool face angle measuring device of the present invention, the outer cylinder and the inner cylinder are fixedly connected, and the inner cylinder and the encoding disk are connected by a bearing. When the outer cylinder rotates, it drives the inner cylinder and the encoding disk to rotate. At this time, the inner cylinder and the encoding disk are relatively stationary (friction causes the two to be relatively stationary), and they rotate together with the outer cylinder. When measuring the tool face angle, the outer cylinder does not rotate, and the inner cylinder does not rotate at this time. Then, by increasing the drilling fluid pump pressure, the piston is pushed to open the inner flow channel, driving the encoding disk to rotate relative to the inner cylinder. The encoding disk rotation control drive assembly of the present invention utilizes the change of the drilling fluid pump pressure to drive the encoding disk to rotate instead of using a rotating drill bit to drive it, so that during the measurement of the encoding disk rotation, the valve block and the weighted power mechanism that controls the stability of the valve block, the related supporting bearing assembly, etc. are all in a stable state. The valve block maintains a fixed direction without interference, so that the measurement result is more accurate.

[0028] 3. In the prior art, regardless of whether the tool face angle is measured or not, the drilling fluid will always flow through the throttle hole, valve block and other components. The throttle hole is easily eroded and deformed, causing the pressure wave signal formed by the valve block blocking the throttle hole to deform and reduce the measurement accuracy of the tool face angle. The mechanical tool face angle measuring device of the present invention is provided with two inner and outer flow channels, corresponding to separate the two working states of normal drilling and measuring the tool face angle. When the tool face angle measurement is not required for normal drilling, the inner flow channel of the encoding disk is closed and the encoding disk will not be washed. The flow rate flows out through the smooth annular outer flow channel, and the pressure loss of the drilling fluid caused by this measurement structure will also be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall cross-section three-dimensional assembly of the mechanical tool face angle measurement device of Example 1.

[0030] Figure 2 It is a schematic diagram of the overall cross-section three-dimensional assembly of the mechanical tool face angle measurement device of Example 1.

[0031] Figure 3 Schematic diagram of the linkage structure of the piston and the encoding disk in the mechanical tool face angle measuring device of Example 1.

[0032] Figure 4 Schematic diagram of the position relationship between the encoding disk and the valve block in the mechanical tool face angle measurement device of Example 1.

[0033] Figure 5 Schematic diagram of the valve block blocking the throttling hole in the mechanical tool face angle measurement device of Example 1.

[0034] In the figure:

[0035] 1-outer cylinder, 2-inner cylinder, 21-reset positioning shoulder, 3-piston, 4-screw, 41-input screw, 42-output screw, 43-screw support, 44-screw assembly, 441-nut, 5-first reset spring, 6-second reset spring, 7-clutch, 71-input part, 72-output part, 8-encoding disk, 81-throttle hole, 9-valve block, 10-biased power mechanism, 100-external flow channel, 200-internal flow channel. DETAILED DESCRIPTION

[0036] In order to make the technical personnel in this field better understand the present application scheme, the present application will be clearly and completely described below in conjunction with the embodiments and drawings. Obviously, the described embodiments are only embodiments of a part of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work should belong to the scope of protection of this application. The instruments and reagents used in the embodiments are all derived from commercial channels unless otherwise specified.

[0037] Example 1

[0038] Please refer to Figure 1 and Figure 2 , is a mechanical tool face angle measuring device of an embodiment, comprising an outer cylinder 1, an inner cylinder 2, a code disc rotation control drive assembly, a code disc 8, a valve block 9 and a eccentric weight power mechanism 10.

[0039] The outer cylinder 1 is the outer cylinder of the drilling tool, and the inner cylinder 2 is a cylindrical structure with an axial support edge on the outer periphery. The inner cylinder 2 is fixedly sleeved in the outer cylinder 1, and a nearly annular outer flow channel 100 is formed between the inner cylinder 2 and the outer cylinder 1 (the drilling fluid flows around the support edge). The upper end of the inner cylinder 2 extends radially inward to form a reset positioning shoulder 21, and the inner cylinder 2 is enclosed to form an inner flow channel 200.

[0040] The encoder disk rotation control drive assembly, the encoder disk 8, the valve block 9 and the eccentric weight power mechanism 10 are sequentially connected and installed in the inner cylinder 2.

[0041] The encoder disk rotation control drive assembly includes a piston 3 , a screw 4 , a screw support 43 , a first return spring 5 , a clutch 7 , a screw assembly 44 and a second return spring 6 .

[0042] Please refer to Figure 3 The piston 3 is made of rubber, thick in the middle and thin at the edge. The edge of the piston 3 cooperates with the reset positioning shoulder 21 of the inner tube 2 to block or open the inner flow channel 200. The screw rod 4 is divided into two sections, an input screw rod 41 and an output screw rod 42. The clutch 7 includes two sections, an input part 71 and an output part 72, whose end faces can mesh with each other. One end of the input screw rod 41 is fixedly connected to the piston 3, and the other end is fixedly connected to the clutch input part 71. One end of the output screw rod 42 is fixedly connected to the clutch output part 72, and the other end is connected to the screw rod assembly part 44 through a nut 441. The input screw rod 41 and the output screw rod 42 are each positioned in the axial direction of the inner tube 2 through a screw rod support 43. The screw rod support 43 is disc-shaped, and its outer edge abuts against the inner wall of the inner tube 2. The center of the disc-shaped screw rod support 43 is assembled with the input screw rod 41 and the output screw rod 42 through a nut supported by a bearing, so that the screw rod 4 always moves in the center of the drilling tool, thereby driving the encoder disk 8 to rotate.

[0043] Alternatively, another terminal positioning shoulder may be set in parallel at a distance relative to the reset positioning shoulder 21, and the first reset spring 5 is set between the two positioning shoulders. The spring compression distance between the two positioning shoulders is the maximum movement stroke of the screw rod.

[0044] The first return spring 5 is sleeved on the input screw 41, and the two ends respectively contact the piston 3 and the screw support 43 for positioning the input screw 41. The clutch input part 71 and the output part 72 are not in contact, and the clutch input part 71 and the output part 72 are in contact and engaged only when the piston 3 moves downward and drives the input screw 41 downward. When the drilling fluid pressure driving the piston 3 downward decreases, the piston 3 and the input screw 41 will be reset under the elastic force of the first return spring 5 to block the inner flow channel 200.

[0045] The screw assembly part 44 is a columnar cylindrical structure, with a nut 441 provided at the center of the end away from the code disk 8 for the output screw 42 to pass through, and the end close to the code disk 8 is fixedly connected to the code disk 8. The screw assembly part 44 should have sufficient space for the screw 4 to move in the axial direction. A second return spring 6 is connected between the end of the output screw 42 passing through the nut 441 and the code disk 8. When the output screw 42 moves axially and compresses the second return spring 6 to the limit, the code disk 8 can be driven to rotate. When the power disappears, the output screw 42 can rotate in the opposite direction and reset under the elastic force of the second return spring 6.

[0046] Please refer to Figure 4 The code disk 8 is installed in the inner cylinder 2 through a bearing structure and can rotate relative to the inner cylinder 2. The code disk 8 is provided with a plurality of throttle holes 81 in the circumferential direction. The valve block 9 is arranged in contact with the code disk 8 and the valve block 9 can rotate relative to the code disk 8 and stably point to the direction of gravity. When the code disk 8 rotates relative to the valve block 9, part of the throttle holes 81 will be blocked by the valve block 9. The valve block 9 is connected to the eccentric weight power mechanism 10 through a connecting mechanism (such as a supporting shaft and other structures). The eccentric weight power mechanism 10 is installed in the inner cylinder 2 through a bearing and can drive the valve block 9 to rotate. The eccentric weight power mechanism 10 uses its own eccentric weight characteristics to drive the valve block 9 to maintain a stable direction of gravity.

[0047] The installation control of the valve block 9 can refer to the existing technology. For example, the valve block 9 can always point to the direction of gravity by using a structural form in which the gravity deflection torque is generated by the eccentric weight power mechanism 10 composed of two semi-cylinders with different densities. Similarly, relevant mandrels, support members, and bearing members should be provided so that the valve block 9 and the eccentric weight power mechanism 10 can rotate freely relative to the drilling tool.

[0048] Please refer to Figure 5 The encoding disk 8 should also preferably be arranged at the central axis of the drilling tool (ensuring coaxiality with the drilling tool) so that the encoding disk 8 has a large enough area to arrange encoding throttle holes 81 of different sizes. Figure 5 An implementation of a code disc 8 and a matching valve block 9 is provided. The code disc 8 is circular, and the diameter of the code disc 8 is preferably close to the diameter of the inner barrel of the drilling tool, so that the drilling fluid mainly flows through the throttle hole 81 rather than through the gap formed between the edge of the code disc 8 and the inner barrel. In the specific implementation process, a certain gap should be maintained between the code disc 8 and the inner wall of the inner barrel to avoid friction resistance when the code disc 8 rotates relative to the drilling tool under the drive of the code disc rotation control drive assembly.

[0049] like Figure 5As shown, a number of throttling holes 81 of different sizes are provided at intervals along the circumference on the coding disk 8, and the size of the valve block 9 can preferably be able to completely block each throttling hole 81 individually. When the valve block 9 blocks a certain throttling hole 81, the drilling fluid flows through all the remaining throttling holes 81. Since the size of each throttling hole 81 is different, the size of the corresponding combination of the remaining throttling holes 81 that are not blocked is also different. Therefore, when the valve block 9 blocks different throttling holes 81, the effective throttling area of ​​the drilling fluid flowing through the coding disk 8 is different, thereby generating upstream pressure fluctuations of different pressure amplitudes, i.e., pressure waves. The more throttling holes 81 of different sizes arranged in the circumferential direction, the greater the change gradient of the effective throttling area, and the higher the measurement accuracy of the device.

[0050] like Figure 5 As shown, 6 throttle holes 81 of different sizes are arranged, which are named A, B, C, D, E, and F in order. Each throttle hole 81 represents a 30° tool face. One rotation of the encoder disk 8 can generate 6 pressure waves with different pressure amplitudes, namely signals a, b, c, d, e, and f. The gravity valve block remains stationary, and one rotation of the encoder disk 8 can generate a set of pressure wave combinations. When the throttle hole A is blocked, the encoder disk 8 will start to rotate once and generate a signal combination abcdef. When the throttle hole B is blocked, the encoder disk will start to rotate once and generate a signal combination bcdefa. By analogy, due to the different throttle holes that are initially blocked, 6 signal combinations will be generated.

[0051] Tool face angle measurement process and principle:

[0052] In the above mechanical tool face angle measuring device, in the non-measurement state, the screw rod 4 and the code disk 8 are in the reset state through the elastic support of the first reset spring 5 and the second reset spring 6. At this time, the code disk 8 rotates synchronously with the inner tube 2 and the outer tube 1, and the valve block 9 always points to the gravity direction and does not rotate with the inner and outer tubes and the code disk 8. Since the piston 3 is supported by the first reset spring 5 and presses the reset positioning shoulder 21, the drilling fluid cannot enter the inner flow channel 200 when the drilling fluid pump pressure is in the first range, but flows in the outer flow channel 100. In this state, the clutch input part 71 and the output part 72 are separated, the position of the screw rod 4 relative to the drilling tool in the circumferential direction remains unchanged, and the position of the code disk 8 relative to the drilling tool in the circumferential direction remains unchanged. The code disk 8 in the reset state moves synchronously with the drilling tool. When the drilling tool rotates around its central axis to change the tool face angle, the code disk 8 in the reset state also rotates accordingly, and the valve block 9 always points to the bottom side gravity direction. The relative rotation angle of the code disk 8 relative to the valve block 9 is the angle of the drilling tool tool face angle relative to the bottom side of the wellbore.

[0053] When the drill tool drives the code disk 8 to rotate to different tool face angles and stops to prepare for the measurement of the tool face angle, compared with the prior art mentioned in the background technology, the present solution does not need to rotate the drill tool (at this time, both the inner tube and the outer tube do not rotate), but increases the drilling fluid pump pressure to the second range. The pump pressure in the second range is greater than the first range, and the piston 3 is pushed to drive the input screw 41 to move along the axial direction of the drill tool until the clutch 7 is closed, and then the clutch 7 continues to push the output screw 42 to continue to move axially and then rotate along the nut 411 to compress the second return spring 6. When the pressure reaches the limit, the code disk 8 can be driven to rotate. The valve block 9 stably pointing to the direction of gravity continuously switches (blocks) one of the different throttle holes 81 on the code disk 8. The throttle holes blocked by different tool face angles are different. When the code disk rotates for at least one cycle, a set of pressure wave signal combinations will be generated to form a pressure wave signal on the ground. The starting phase point of the pressure wave signal is the moment when the encoder disk 8 switches from the reset state to the measurement state. When the tool face angle of the drill tool changes, the starting phase point of the pressure wave signal will change, so that the position of the current tool face can be determined by the changing pressure wave signal. The name of the throttle hole that was initially blocked can be identified by the pressure wave signal. The size of the tool face angle can be calculated by connecting and identifying the circumferential position of the throttle hole that was initially blocked by the gravity block on the encoder disk, and the measurement accuracy can be improved by increasing the number of throttle holes.

[0054] Unlike the prior art, the present mechanical tool face angle measuring device does not generate pressure waves by rotating the outer tube of the drill tool to drive the encoder disk to rotate relative to the valve block, but drives the encoder disk to rotate by increasing the drilling fluid pump pressure. The present device does not need to rotate the drill tool to measure the tool face angle, thereby avoiding the disadvantage that the valve block disturbance deflection caused by the rotation of the drill tool outer tube cannot always stably keep pointing in the direction of gravity. Compared with the prior art, the present device improves the measurement accuracy of the tool face angle and greatly reduces the error.

[0055] It is worth pointing out that in order to make the valve block 9 and the coding disk throttling hole 81 opened on the coding disk 8 move relative to each other to generate a specific mud pulse pressure wave waveform, technical personnel in this field should be very clear that the implementation method is to set the coding disk 8 in all or part of the flow channel of the drill bit, so that all or part of the drilling fluid can only flow through the coding disk 8 through the opened coding throttling hole 81. When the flow rate (displacement) of the incoming drilling fluid in the drill bit remains unchanged or changes slightly, the opening and closing of the throttling hole 81 will change the size of the effective throttling area, and then change the drilling fluid pressure difference before and after the throttling hole, and then generate a regularly changing pressure fluctuation signal matching the law of the throttling hole area change upstream of the device, thereby realizing the association and conversion between the relative movement signal of the valve block and the coding disk and the pressure fluctuation signal.

[0056] When the tool face angle measurement is completed, under the elastic support of the second return spring 6 and the first return spring 5, the encoding disk 8 rotates in the opposite direction to reset, and the input screw 41 moves in the opposite direction to reset, and the piston 3 re-blocks the inner flow channel 200. At this time, the encoding disk 8 is relatively stationary with the inner and outer cylinders due to friction resistance, preventing the drilling fluid from flushing the encoding disk 8 and other components.

[0057] The above mechanical tool face angle measuring device increases the drilling fluid pump pressure to push the piston to drive the screw rod to move along the axial direction of the drill bit, and the screw rod then drives the encoder disc to rotate through the nut to achieve the measurement of the tool face angle. This effectively solves the problem of large tool face angle measurement errors caused by the external cylinder driving the encoder disc to rotate to measure the tool face in the prior art.

[0058] The invention concept is described in detail using specific examples herein, and the description of the above embodiments is only used to help understand the core idea of ​​the invention. It should be pointed out that any obvious modification, equivalent substitution or other improvement made by a person of ordinary skill in the art without departing from the invention concept should be included in the protection scope of the present invention.

Claims

1. A mechanical tool face angle measuring device, characterized in that: It includes an outer cylinder, an inner cylinder, a code disc rotation control drive assembly, a code disc and a valve block; The inner cylinder is fixedly sleeved in the outer cylinder, the inner cylinder is enclosed to form an inner flow channel, and the inner cylinder and the outer cylinder are spaced to form an annular outer flow channel; The encoder disk rotation control drive assembly, the encoder disk and the valve block are sequentially connected and installed in the inner cylinder; The valve block stably points to the direction of gravity, the encoding disc is installed in the inner cylinder through a bearing and is close to the valve block and can rotate relative to the valve block, a plurality of throttle holes are opened in the circumference of the encoding disc, and when the encoding disc rotates relative to the valve block, some of the throttle holes will be blocked by the valve block; When the drilling fluid pump pressure is in the first range, the encoder disk rotates to control the drive assembly to block the inner cylinder so that the drilling fluid passes through the outer flow channel; When the drilling fluid pump pressure increases to the second range, the encoder disk rotation control drive assembly opens the inner tube and enters the inner flow channel under the impact of high-pressure drilling fluid to drive the encoder disk to rotate so that different throttling holes are blocked by the valve block, generating different pressure waves to achieve tool face angle measurement.

2. The mechanical tool face angle measuring device according to claim 1, characterized in that: The encoder disk rotation control drive assembly comprises a piston, a screw rod, a screw rod support and a first return spring; the screw rod support is fixedly mounted in the inner cylinder to support the screw rod and enable the screw rod to move in the axial direction, one end of the screw rod is fixedly connected to the piston, and the other end of the screw rod is connected to the encoder disk through a nut transmission; the inner wall of the inner cylinder is provided with a return positioning shoulder, the first return spring is sleeved on the screw rod, one end of the first return spring contacts the piston, and the other end contacts the screw rod support; When the drilling fluid pump pressure is in the first range, the piston presses against the reset positioning shoulder under the elastic force of the first reset spring to seal the inner tube.

3. The mechanical tool face angle measuring device according to claim 2, characterized in that: The screw assembly part is a columnar cylinder structure, a nut is arranged at the center of the end away from the encoding disk for the screw to pass through, and the end close to the encoding disk is fixedly connected to the encoding disk, and a second return spring is connected between the end of the screw that passes through the nut and the encoding disk; when the piston drives the screw to move axially and compresses the second return spring to the limit, the encoding disk can be driven to rotate, and when the piston driving force disappears, the screw can rotate in the opposite direction and reset under the elastic force of the second return spring.

4. The mechanical tool face angle measuring device according to claim 2, characterized in that: The encoder disk rotation control drive assembly also includes a clutch, the clutch includes an input part and an output part whose end faces can mesh with each other, the screw includes an input screw and an output screw, wherein one end of the input screw is fixedly connected to the piston, and the other end is fixedly connected to the clutch input part, and one end of the output screw is fixedly connected to the clutch output part, and the other end is connected to the screw assembly part through a nut transmission; When the drilling fluid pump pressure is in the first range, the input part and the output part of the clutch are separated; When the drilling fluid pump pressure increases to the second range, the piston moves axially under the impact of the high-pressure drilling fluid to open the inner tube and drive the input part of the clutch to move and engage with the output part of the clutch, thereby driving the output screw to rotate to drive the encoder disk to rotate.

5. The mechanical tool face angle measuring device according to claim 4, characterized in that: The screw assembly part is a columnar cylindrical structure, a nut is arranged at the center of the end away from the encoding disk for the output screw to pass through, and the end close to the encoding disk is fixedly connected to the encoding disk, and a second return spring is connected between the end of the output screw passing through the nut and the encoding disk; when the piston drives the output screw to move axially and compresses the second return spring to the limit, the encoding disk can be driven to rotate, and when the piston driving force disappears, the output screw can rotate in the opposite direction and reset under the elastic force of the second return spring.

6. The mechanical tool face angle measuring device according to claim 1, characterized in that: The encoder disk rotation control drive assembly comprises a piston, a screw rod, a screw rod support and a second return spring; the screw rod support is fixedly mounted in the inner cylinder to support the screw rod and enable the screw rod to move in the axial direction, one end of the screw rod is fixedly connected to the piston, and the other end of the screw rod is connected to the encoder disk through a nut; a return positioning shoulder is provided on the inner wall of the inner cylinder, and the second return spring is installed between the screw rod and the encoder disk; When the drilling fluid pump pressure is in the first range, the screw rod moves away from the encoding disc under the elastic force of the second return spring, so that the piston at the other end of the screw rod presses against the return positioning shoulder to block the inner tube.

7. The mechanical tool face angle measuring device according to claim 6, characterized in that: It also includes a screw assembly part, which is a columnar barrel structure. A nut is arranged at the center of one end away from the encoding disk for the output screw to pass through, and the end close to the encoding disk is fixedly connected to the encoding disk.

8. The mechanical tool face angle measuring device according to claim 1, characterized in that: The valve block is connected with a biased weight power mechanism, which is installed in the inner cylinder through a bearing and can drive the valve block to rotate. The biased weight power mechanism uses its own biased weight characteristics to drive the valve block to maintain stable pointing in the direction of gravity.

9. The mechanical tool face angle measuring device according to claim 1, characterized in that: The throttle holes have different areas, and the size of the valve block is based on the ability to completely cover each throttle hole independently.

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