Self-locking device and method for drilling measurement instrument

Abstract

The present invention relates to a self-locking device and method for a drilling measurement instrument. The technical scheme is as follows: it includes a self-locking mechanism and an instrument joint, an outer cylinder is provided on the outer side of a salvage head, three slip grooves are evenly distributed on the outer cylinder in the circumferential direction, the slips are placed in the slip grooves, a bevel body is provided inside the outer cylinder, the bevel body is connected to the lower part of the salvage head by threads, the upper part of the bevel body is connected to the lower part of the slip, a locking spring is provided at the upper end of the bevel body, an instrument joint is provided at the lower part of the outer cylinder, a small spring is sleeved on the instrument joint housing, a cruise ship is provided at the lower part of the small spring, a semicircular clip is provided at the lower part of the cruise ship, and a ten-core seat assembly is provided inside the instrument joint housing. The beneficial effects of the present invention are as follows: the present invention can prevent the instrument from being disengaged when drilling, no one-way valve is used, cost is reduced, and trouble is reduced; the instrument is prevented from falling into the well, the instrument is protected, and safety is improved; the instrument is straightened, which is equivalent to a durable measuring instrument straightener assembly; the instrument can be salvaged.

Description

Technical Field

[0001] The invention relates to a measurement while drilling instrument, and in particular to a self-locking device and method for the measurement while drilling instrument. Background Art

[0002] In China, when using QDT, YST-48X, YST-48R and other measuring instruments for directional well operations, in order to prevent the measuring instrument from being pushed out of the key slot due to the upward return of drilling fluid in the drill tool during the drilling process, the common practice currently adopted is to install a normally closed one-way valve at the lower end of the instrument. The function of this one-way valve is to prevent the drilling fluid in the annulus from entering the drill tool and moving upward during drilling, thus avoiding the risk of instrument de-keying during drilling. However, the practice of using a one-way valve to prevent instrument de-keying has at least the following disadvantages:

[0003] 1. Increased production costs. The one-way valve (arrow-shaped valve) has a short service life. In eastern my country, a well needs to be repaired before it is used up. The usage is very large, which directly increases the production cost.

[0004] 2. Grouting is required when drilling, which indirectly increases production costs.

[0005] 3. Increased downhole risk. Every additional joint in the downhole drilling tool assembly adds another downhole risk.

[0006] 4. Increased the labor intensity of construction workers.

[0007] At present, instruments such as YST-48X, YST-48R, and QDT are widely used in directional well measurement while drilling construction in China, and therefore a large number of one-way valves are used as downhole tools. In order to save costs, reduce the risk of downhole accidents, and reduce the labor intensity of construction workers, the construction party urgently needs a safe and simple alternative device. Summary of the invention

[0008] The purpose of the present invention is to provide a self-locking device and method for a downhole measuring instrument in view of the above-mentioned defects in the prior art, which can prevent the instrument from being disengaged when drilling, and no longer use a one-way valve, thereby reducing costs and troubles; preventing the instrument from falling into the well, protecting the instrument and improving safety; straightening the instrument, with three slips pressed against the inner wall of the drill bit to center the measuring instrument, which is equivalent to a durable measuring instrument straightener assembly; the instrument can be salvaged.

[0009] The technical scheme is as follows: it comprises a self-locking mechanism and an instrument joint, wherein an instrument joint is arranged at the lower part of the self-locking mechanism, the self-locking mechanism comprises a fishing head, an outer cylinder, a locking spring, a slip, and a bevel body, an outer cylinder is arranged on the outer side of the fishing head, three slip grooves are evenly distributed circumferentially on the outer cylinder, the slips are arranged in the slip grooves, a bevel body is arranged inside the outer cylinder, the bevel body is connected to the lower part of the fishing head through a thread, the upper part of the bevel body is connected to the lower part of the slip, a locking spring is arranged at the upper end of the bevel body, an instrument joint is arranged at the lower part of the outer cylinder, the bevel body is connected to the fishing head through a thread, the upper part of the bevel body is connected to the lower part of the slip, a locking spring is arranged at the upper end of the bevel body, and an instrument joint is arranged at the lower part of the outer cylinder. A gap is provided between the instrument joints, the bevel body moves up and down through a locking spring, the outer cylinder is connected to the instrument joint through a ball bearing, the instrument joint rotates flexibly through the ball bearing, the instrument joint comprises an instrument joint housing, a small spring, a cruise wheel, a semicircular clip, and a ten-core seat assembly, a small spring, a cruise wheel, and a semicircular clip are provided at the lower part of the instrument joint housing, the small spring is sleeved on the instrument joint housing, a cruise wheel is provided at the lower part of the small spring, a semicircular clip is provided at the lower part of the cruise wheel, and a ten-core seat assembly is provided inside the instrument joint housing.

[0010] Preferably, a cavity is formed between the outer tube and the fishing head, the locking spring is installed in the cavity, the lower part of the fishing head is a spring guide rod, and the locking spring is sleeved on the spring guide rod.

[0011] Preferably, a transverse pin is integrally connected to the middle of the fishing head, the diameter of the spring guide rod is smaller than the diameter of the middle of the fishing head, and the diameter of the upper part of the fishing head is smaller than the diameter of the middle of the fishing head.

[0012] Preferably, a T-shaped groove is provided at the lower part of the slip and the middle part of the inclined body, and the inclined body and the slip are connected through the T-shaped groove.

[0013] Preferably, the inclination angle of the bevel is less than 30 degrees.

[0014] Preferably, the outer surface of the slip is provided with grabbing teeth, and the grabbing teeth are an alloy layer with extremely high hardness.

[0015] Preferably, the instrument connector is connected to the measuring instrument body through a cruise ship, the semicircular clamp is locked, the measuring instrument body sits on the key, the locking spring pushes the inclined body to move downward, the inclined body drives three circumferentially evenly distributed slips to extend outward and press against the inner wall of the drill bit, and the grab teeth on the surface of the slip eat into the inner wall of the drill bit.

[0016] The method for using the self-locking device of a drilling measurement instrument mentioned in the present invention is as follows:

[0017] First, three slip grooves are circumferentially arranged in the middle of the outer cylinder, and the three slips are respectively placed in the slip grooves. The outer surface of the slip is processed with grab teeth. A bevel body is arranged on the inner side of the middle of the outer cylinder. The bevel body is connected with the three slips through a T-slot. A standard YST-X instrument salvaging head is inserted into the upper part of the outer cylinder. A locking spring is sleeved on the spring guide rod at the lower part of the salvaging head. The lower part of the salvaging head is connected with the upper part of the bevel body through a thread. The locking spring is arranged at the upper part of the bevel body. The locking spring is in a cavity formed between the outer cylinder and the salvaging head. The outer cylinder is connected to the instrument joint housing through a ball bearing. The spring is sleeved on the instrument joint housing. A cruise wheel is arranged at the lower part of the small spring. A semicircular card flap is arranged at the lower part of the cruise wheel. A ten-core seat assembly is arranged inside the instrument joint housing, and the instrument joint is connected to the measuring instrument body through the cruise wheel.

[0018] Secondly, on the runway of the well site, the device is connected to the measuring instrument body through the cruise ship on the instrument connector, and the measuring instrument body is hoisted onto the drilling platform with a rope loop and an electric hoist, and placed vertically in a space on the drilling platform, so that the fishing head of the device is above the drilling platform surface, and the cross pin on the fishing rod is grasped with a special tool, and then the measuring instrument body is hoisted with an electric hoist and placed into the non-magnetic drill collar at the wellhead. The slips on the self-locking mechanism are in a retracted state under the action of the deadweight of the measuring instrument body, which will not affect the lowering of the measuring instrument body. When the instrument is completed, After the key is pressed, the slips are no longer affected by the deadweight of the measuring instrument body, and the locking spring pushes the inclined body downward. The inclined body drives the three circumferentially evenly distributed slips to extend outward and press against the inner wall of the drill bit. Since the angle of the inclined body is very small, less than 30 degrees, the torque of the slips extending outward has an amplifying effect, and the grabbing teeth on the surface of the slips eat into the inner wall of the drill bit and press against the inner wall of the drill collar to form a lock. The circumferential locking force between the slips and the inner wall of the drill collar is much greater than the upward impact force of the drilling fluid on the instrument when drilling and the deadweight of the measuring instrument body.

[0019] The beneficial effects of the present invention are as follows: the present invention can prevent the instrument from being disengaged when drilling, and no one-way valve is used anymore, which reduces costs and troubles; it can prevent the instrument from falling into the well, protect the instrument and improve safety; it can straighten the instrument, and three slips are pressed against the inner wall of the drill bit to play a centering and straightening role for the measuring instrument, which is equivalent to a durable measuring instrument straightener assembly; the instrument can be salvaged, and the head of the device is a standard salvage head. When necessary, a salvage tool can be lowered from the drill bit to salvage and recover the measuring instrument. The circumferential locking force between the slips of the present invention and the inner wall of the drill collar is much greater than the upward impact force of the drilling fluid on the instrument when drilling and the deadweight of the instrument, so it can avoid the accident of the instrument being disengaged and the accident of the instrument falling into the well due to the break between the directional joint and the non-magnetic drill collar. In addition, the invention has the function of centering and straightening the instrument, has a long service life, can be used for a long time, and has obvious economic benefits. In addition, the instrument joint of the device and the outer cylinder on the upper part are connected with a ball bearing, which can ensure that the part below the outer cylinder can rotate flexibly before the key, which is more conducive to successful keying. After installing the device, whether it is the keying operation at the wellhead or the instrument removal and salvage operation, it is basically the same as the original operation, and the on-site construction personnel do not need special training. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Attached Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Attached Figure 2 It is a schematic diagram of the structure of Kava;

[0022] Attached Figure 3 It is a schematic diagram of the structure of the T-slot;

[0023] Attached Figure 4 It is a schematic diagram of the structure of the grabbing teeth;

[0024] In the figure: fishing head 1, outer cylinder 2, locking spring 3, slip 4, inclined body 5, ball bearing 6, instrument joint housing 7, small spring 8, cruise ship 9, semicircular card flap 10, ten core seat assembly 11, slip groove 12, cavity 13, spring guide rod 14, cross pin 15, T-slot 16, grabbing tooth 17. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0026] Embodiment 1:

[0027] The present invention comprises a self-locking mechanism and an instrument joint, wherein an instrument joint is arranged at the lower part of the self-locking mechanism, the self-locking mechanism comprises a fishing head 1, an outer cylinder 2, a locking spring 3, a slip 4, and a bevel body 5, an outer cylinder 2 is arranged on the outer side of the fishing head 1, three slip grooves 12 are evenly distributed circumferentially on the outer cylinder 2, the slip 4 is arranged in the slip groove 12, a bevel body 5 is arranged inside the outer cylinder 2, the bevel body 5 is connected to the lower part of the fishing head 1 by threads, the upper part of the bevel body 5 is connected to the lower part of the slip 4, a locking spring 3 is arranged at the upper end of the bevel body 5, an instrument joint is arranged at the lower part of the outer cylinder 2, a gap is arranged between the bevel body 5 and the instrument joint, and the bevel body 5 is connected to the lower part of the slip 4 by locking spring 3. The tightening spring 3 moves up and down, the outer cylinder 2 is connected to the instrument joint through the ball bearing 6, and the instrument joint rotates flexibly through the ball bearing 6. The instrument joint includes an instrument joint housing 7, a small spring 8, a cruise ship 9, a semicircular clamping flap 10, and a ten-core seat assembly 11. The lower part of the instrument joint housing 7 is provided with a small spring 8, a cruise ship 9, and a semicircular clamping flap 10. The small spring 8 is sleeved on the instrument joint housing 7, and a cruise ship 9 is provided at the lower part of the small spring 8. The semicircular clamping flap 10 is provided at the lower part of the cruise ship 9. A ten-core seat assembly 11 is provided inside the instrument joint housing 7. The salvage head of this device is a standard YST-48X instrument standard salvage head.

[0028] Among them, a cavity 13 is formed between the outer tube 2 and the salvage head 1, and the locking spring 3 is installed in the cavity 13. The lower part of the salvage head 1 is a spring guide rod 14, and the locking spring 3 is sleeved on the spring guide rod 14 to realize the guidance and installation of the spring. It is installed in the cavity and guided by the spring guide rod.

[0029] Among them, a cross pin 15 is integrally connected to the middle part of the salvage head 1, the diameter of the spring guide rod 14 is smaller than the diameter of the middle part of the salvage head 1, and the diameter of the upper part of the salvage head 1 is smaller than the diameter of the middle part of the salvage head 1. The cross pin on the salvage rod can be grasped with a special tool, and then the main body of the measuring instrument is lifted by an electric hoist and placed in the non-magnetic drill collar at the wellhead.

[0030] In addition, a T-slot 16 is provided at the lower part of the slip 4 and the middle part of the ramp body 5. The ramp body 5 and the slip 4 are connected by the T-slot 16, so that the locking spring pushes the ramp body to move downward, and the ramp body drives three circumferentially evenly distributed slips to extend outward and press against the inner wall of the drilling tool.

[0031] In addition, the inclination angle of the bevel body 5 is less than 30 degrees. Since the angle of the bevel body is very small, less than 30 degrees, the torque of the slip extending outward has an amplifying effect, and the grabbing teeth on the surface of the slip eat into the inner wall of the drill bit and press against the inner wall of the drill collar to form a lock. The circumferential locking force between the slip and the inner wall of the drill collar is much greater than the upward impact force of the drilling fluid on the instrument when drilling and the deadweight of the measuring instrument body, which can avoid the occurrence of the keying accident of the measuring instrument body and the accident of the instrument falling into the well due to the break between the directional joint and the non-magnetic drill collar.

[0032] The method for using the self-locking device of a drilling measurement instrument mentioned in the present invention is as follows:

[0033] First, three slip grooves 12 are circumferentially provided in the middle of the outer cylinder 2, and the three slips 4 are respectively placed in the slip grooves 12. A bevel body 5 is provided on the inner side of the middle of the outer cylinder 2. The bevel body 5 is connected to the three slips 4 through a T-slot 16. A standard YST-48X instrument standard fishing head 1 is inserted into the upper part of the outer cylinder 2. A locking spring 3 is sleeved on the spring guide rod 14 at the lower part of the fishing head 1. The lower part of the fishing head 1 is connected to the upper part of the bevel body 5 through a thread. The locking spring 3 is arranged at the upper part of the bevel body 5. The locking spring 3 is in a cavity 13 formed between the outer cylinder 2 and the fishing head 1. The outer cylinder 2 is connected to the instrument joint housing 7 through a ball bearing 6. The spring 8 is sleeved on the instrument joint housing 7. A cruise wheel 9 is provided at the lower part of the small spring 8. A semicircular card flap 10 is provided at the lower part of the cruise wheel 9. A ten-core seat assembly 11 is provided inside the instrument joint housing 7. The instrument joint is connected to the measuring instrument body through the cruise wheel 9.

[0034] Secondly, on the runway of the well site, the device is connected to the measuring instrument body through the cruise ship 9 on the instrument connector, and the measuring instrument body is hoisted onto the drilling platform with a rope loop and an electric hoist, and vertically placed in a space on the drilling platform, so that the fishing head 1 of the device is above the drilling platform surface, and the cross pin 15 on the fishing rod is grasped with a special tool, and then the measuring instrument body is hoisted with an electric hoist and placed into the non-magnetic drill collar at the wellhead. The slips 4 on the self-locking mechanism are in a retracted state under the action of the deadweight of the measuring instrument body, and will not affect the lowering of the measuring instrument body. When the instrument is successfully seated, the slip 4 is no longer affected by the deadweight of the measuring instrument body, and the locking spring 3 pushes the inclined surface 5 to move downward. The inclined surface 5 drives the three circumferentially evenly distributed slips 4 to extend outward and press against the inner wall of the drill bit. Since the angle of the inclined surface is very small, less than 30 degrees, the torque of the slip 4 extending outward has an amplifying effect, pressing against the inner wall of the drill collar to form a lock. The circumferential locking force between the slip 4 and the inner wall of the drill collar is much greater than the upward impact force of the drilling fluid on the instrument when drilling and the deadweight of the measuring instrument body.

[0035] The present invention can prevent the instrument from being disengaged when drilling, and no one-way valve is used, which reduces costs and troubles; prevents the instrument from falling into the well, protects the instrument, and improves safety; straightens the instrument, and three slips are pressed against the inner wall of the drill tool to play a central straightening role for the measuring instrument, which is equivalent to a durable measuring instrument straightening assembly; the instrument can be salvaged, and the head of the device is a standard salvage head. When necessary, a salvage tool can be lowered from the drill tool to salvage and recover the measuring instrument. The circumferential locking force between the slips of the invention and the inner wall of the drill collar is much greater than the upward impact force of the drilling fluid on the instrument when drilling and the deadweight of the instrument, so the accident of the instrument being disengaged and the accident of the instrument falling into the well due to the break between the directional joint and the non-magnetic drill collar can be avoided. In addition, the invention has the function of centering the instrument, has a long service life, can be used for a long time, and has obvious economic benefits. In addition, the instrument joint of the device and the outer cylinder on its upper part are connected by ball bearings, which can ensure that the part below the outer cylinder can rotate flexibly before the seat key, which is more conducive to successful seat keying. After the device is installed, the operation of sitting on the wellhead, taking out the instrument, and salvaging the equipment are basically the same as the original operation, and no special training is required for on-site construction personnel.

[0036] Embodiment 2:

[0037] The difference from Example 1 is that: the outer surface of the slip 4 is provided with grab teeth 17, and the grab teeth 17 are an alloy layer with extremely high hardness. The grab teeth on the surface of the slip eat into the inner wall of the drill tool and press against the inner wall of the drill collar to form a lock, which can avoid the accident of the measuring instrument body being debonded and the accident of the instrument falling into the well due to the break between the directional joint and the non-magnetic drill collar.

[0038] The instrument connector is connected to the measuring instrument body through the cruise ship 9, and the semicircular clamping flap 10 is stuck to prevent the instrument connector from escaping from the measuring instrument body. The measuring instrument body is seated, and the locking spring 3 pushes the inclined body 5 to move downward. The inclined body 5 drives the three circumferentially evenly distributed slips 4 to extend outward and press against the inner wall of the drill tool. The grab teeth 17 on the surface of the slip 4 eat into the inner wall of the drill tool, and the grab teeth on the surface of the slip eat into the inner wall of the drill tool and press against the inner wall of the drill collar to form a lock, so that the circumferential locking force between the slip and the inner wall of the drill collar is much greater than the upward impact force of the drilling fluid on the instrument when drilling and the deadweight of the measuring instrument body.

[0039] The alloy layer of the grab teeth 17 is titanium alloy.

[0040] The method for using the self-locking device of a drilling measurement instrument mentioned in the present invention is as follows:

[0041] First, three slip grooves 12 are provided in the circumferential direction of the middle part of the outer cylinder 2, and three slips 4 are respectively placed in the slip grooves 12. The outer surface of the slip 4 is processed with a grabbing tooth 17. A bevel body 5 is provided on the inner side of the middle part of the outer cylinder 2. The bevel body 5 is connected with the three slips 4 through a T-slot 16. A standard YST-48X instrument standard fishing head 1 is inserted into the upper part of the outer cylinder 2. A locking spring 3 is mounted on the spring guide rod 14 at the lower part of the fishing head 1. The lower part of the fishing head 1 is connected to the bevel through a thread. The upper part of the body 5 is connected, the locking spring 3 is arranged on the upper part of the inclined plane body 5, the locking spring 3 is in the cavity 13 formed between the outer cylinder 2 and the fishing head 1, the outer cylinder 2 and the instrument joint shell 7 are connected through the ball bearing 6, the spring 8 is sleeved on the instrument joint shell 7, a cruise wheel 9 is provided at the lower part of the small spring 8, a semicircular clamping flap 10 is provided at the lower part of the cruise wheel 9, a ten-core seat assembly 11 is provided inside the instrument joint shell 7, and the instrument joint is connected to the measuring instrument body through the cruise wheel 9.

[0042] Secondly, on the runway of the well site, the device is connected to the measuring instrument body through the cruise ship 9 on the instrument connector, and the measuring instrument body is hoisted onto the drilling platform with a rope loop and an electric hoist, and vertically placed in a space on the drilling platform, so that the fishing head 1 of the device is above the drilling platform surface, and the cross pin 15 on the fishing rod is grasped with a special tool, and then the measuring instrument body is hoisted with an electric hoist and placed into the non-magnetic drill collar at the wellhead. The slips 4 on the self-locking mechanism are in a retracted state under the action of the deadweight of the measuring instrument body, which will not affect the lowering of the measuring instrument body. When the instrument is successfully seated After the key is pressed, the slip 4 is no longer affected by the deadweight of the measuring instrument body, and the locking spring 3 pushes the inclined surface body 5 to move downward. The inclined surface body 5 drives the three circumferentially evenly distributed slips 4 to extend outward and press against the inner wall of the drill bit. Since the angle of the inclined surface body is very small, less than 30 degrees, the torque of the slip 4 extending outward has an amplifying effect, and the grab teeth 17 on the surface of the slip 4 eat into the inner wall of the drill bit and press against the inner wall of the drill collar to form a lock. The circumferential locking force between the slip 4 and the inner wall of the drill collar is much greater than the upward impact force of the drilling fluid on the instrument when drilling and the deadweight of the measuring instrument body.

[0043] The present invention can prevent the instrument from being disengaged when drilling, and no one-way valve is used, which reduces costs and troubles; prevents the instrument from falling into the well, protects the instrument, and improves safety; straightens the instrument, and three slips are pressed against the inner wall of the drill tool to play a central straightening role for the measuring instrument, which is equivalent to a durable measuring instrument straightening assembly; the instrument can be salvaged, and the head of the device is a standard salvage head. When necessary, a salvage tool can be lowered from the drill tool to salvage and recover the measuring instrument. The circumferential locking force between the slips of the invention and the inner wall of the drill collar is much greater than the upward impact force of the drilling fluid on the instrument when drilling and the deadweight of the instrument, so the accident of the instrument being disengaged and the accident of the instrument falling into the well due to the break between the directional joint and the non-magnetic drill collar can be avoided. In addition, the invention has the function of centering the instrument, has a long service life, can be used for a long time, and has obvious economic benefits. In addition, the instrument joint of the device and the outer cylinder on its upper part are connected by ball bearings, which can ensure that the part below the outer cylinder can rotate flexibly before the seat key, which is more conducive to successful seat keying. After the device is installed, whether it is the operation of sitting on the wellhead key or taking out and salvaging the instrument, the operation is basically the same as the original operation, and on-site construction personnel do not need special training. The outer surface of the slip is provided with grab teeth, which are an alloy layer with extremely high hardness. The grab teeth on the surface of the slip eat into the inner wall of the drill tool and press against the inner wall of the drill collar to form a lock, which increases the locking force and avoids the key-off accident of the measuring instrument body and the accident of the instrument falling into the well due to the break between the directional joint and the non-magnetic drill collar.

[0044] The above are only some preferred embodiments of the present invention. Any person skilled in the art may modify the above technical solutions or modify them into equivalent technical solutions. Therefore, any simple modification or equivalent replacement made according to the technical solution of the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A self-locking device for a drilling measurement instrument, characterized by: The invention comprises a self-locking mechanism and an instrument joint, wherein the instrument joint is provided at the lower part of the self-locking mechanism, the self-locking mechanism comprises a fishing head (1), an outer cylinder (2), a locking spring (3), a slip (4), and a bevel body (5), the outer side of the fishing head (1) is provided with an outer cylinder (2), three slip grooves (12) are evenly distributed on the outer cylinder (2), the slip (4) is arranged in the slip groove (12), the inner part of the outer cylinder (2) is provided with a bevel body (5), the bevel body (5) is connected to the lower part of the fishing head (1) by means of a thread, the upper part of the bevel body (5) is connected to the lower part of the slip (4), the upper end of the bevel body (5) is provided with a locking spring (3), the lower part of the outer cylinder (2) is provided with an instrument joint, a gap is provided between the bevel body (5) and the instrument joint, the bevel body (5) moves up and down by means of the locking spring (3), the outer cylinder (2) and the instrument joint are connected by means of a ball bearing (6), the instrument joint rotates flexibly by means of the ball bearing (6), the The instrument connector comprises an instrument connector housing (7), a small spring (8), a cruise wheel (9), a semicircular clip (10), and a ten-core seat assembly (11). The lower part of the instrument connector housing (7) is provided with a small spring (8), a cruise wheel (9), and a semicircular clip (10). The small spring (8) is sleeved on the instrument connector housing (7). The cruise wheel (9) is provided at the lower part of the small spring (8). The semicircular clip (10) is provided at the lower part of the cruise wheel (9). ) is provided with a ten-core seat assembly (11) inside; a cavity (13) is formed between the outer cylinder (2) and the fishing head (1), and a locking spring (3) is installed in the cavity (13); the lower part of the fishing head (1) is a spring guide rod (14), and the locking spring (3) is sleeved on the spring guide rod (14); a T-shaped groove (16) is provided at the lower part of the slip (4) and the middle part of the inclined surface body (5), and the inclined surface body (5) and the slip (4) are connected through the T-shaped groove (16).

2. The self-locking device of a drilling measurement instrument according to claim 1, characterized in that: A transverse pin (15) is integrally connected to the middle of the fishing head (1), the diameter of the spring guide rod (14) is smaller than the diameter of the middle of the fishing head (1), and the diameter of the upper part of the fishing head (1) is smaller than the diameter of the middle of the fishing head (1).

3. The self-locking device of a drilling measurement instrument according to claim 1, characterized in that: The inclination angle of the inclined surface (5) is less than 30 degrees.

4. The self-locking device of a drilling measurement instrument according to claim 1, characterized in that: The outer surface of the slip (4) is provided with grab teeth (17), and the grab teeth (17) are an alloy layer with extremely high hardness.

5. The self-locking device of a drilling measurement instrument according to claim 4 is characterized in that: The joint is connected to the measuring instrument body through the cruise ship (9), the semicircular clamping flap (10) is locked, the measuring instrument body is seated, the locking spring (3) pushes the inclined surface body (5) to move downward, the inclined surface body (5) drives three circumferentially evenly distributed slips (4) to extend outward and press against the inner wall of the drilling tool, and the grab teeth (17) on the surface of the slips (4) eat into the inner wall of the drilling tool.

6. A method for using a self-locking device for a drilling measurement instrument according to any one of claims 1 to 5, characterized in that: The invention comprises the following steps: firstly, three slip grooves (12) are arranged in the circumferential direction of the middle part of the outer cylinder (2), three slips (4) are respectively arranged in the slip grooves (12), the outer surface of the slip (4) is processed with grab teeth (17), a bevel body (5) is arranged on the inner side of the middle part of the outer cylinder (2), the bevel body (5) and the three slips (4) are connected through a T-shaped groove (16), a standard YST-48X instrument fishing head (1) is lowered into the upper part of the outer cylinder (2), a locking spring (3) is sleeved on the spring guide rod (14) at the lower part of the fishing head (1), and a locking spring (3) is sleeved on the spring guide rod (14) at the lower part of the fishing head (1), and a gripping tooth (17) is processed on the outer surface of the slip (4), and a bevel body (5) is arranged on the inner side of the middle part of the outer cylinder (2), and a gripping tooth (17) is processed on the outer surface of the slip (4), and a gripping tooth (17) is processed on the outer surface of the outer cylinder (2). The outer tube (2) is connected to the upper part of the inclined surface body (5) through a thread, and the locking spring (3) is arranged on the upper part of the inclined surface body (5). The locking spring (3) is located in a cavity (13) formed between the outer tube (2) and the fishing head (1). The outer tube (2) is connected to the instrument joint housing (7) through a ball bearing (6). The small spring (8) is sleeved on the instrument joint housing (7). A cruise wheel (9) is provided at the lower part of the small spring (8). A semicircular clamping flap (10) is provided at the lower part of the cruise wheel (9). A ten-core seat assembly (11) is provided inside the instrument joint housing (7). The instrument joint is connected to the measuring device through the cruise wheel (9). The measuring instrument body is connected; secondly, the device is connected to the measuring instrument body through the cruise ship (9) on the instrument connector on the well site runway, and the measuring instrument body is hoisted onto the drilling platform with a rope loop and an electric hoist, and is vertically placed in a space on the drilling platform so that the fishing head (1) of the device is above the drilling platform surface, and the cross pin (15) on the fishing rod is grasped with a special tool, and then the measuring instrument body is hoisted with an electric hoist and placed into the non-magnetic drill collar at the wellhead. The slips (4) on the self-locking mechanism are in a retracted state under the action of the deadweight of the measuring instrument body, and will not affect the lowering of the measuring instrument body. When the instrument is successfully seated, the key After that, the slip (4) is no longer affected by the deadweight of the measuring instrument body, and the locking spring (3) pushes the inclined surface body (5) to move downward. The inclined surface body (5) drives the three slips (4) uniformly distributed in the circumferential direction to extend outward and press against the inner wall of the drilling tool. Since the angle of the inclined surface body is very small, less than 30 degrees, the moment of the slip (4) extending outward has an amplifying effect, and the grab teeth (17) on the surface of the slip (4) eat into the inner wall of the drilling tool and press against the inner wall of the drill collar to form a lock. The circumferential locking force between the slip (4) and the inner wall of the drill collar is much greater than the upward impact force of the drilling fluid on the instrument when drilling and the deadweight of the measuring instrument body.

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