CN114704205A - Static directional build-up rate controllable guide drilling tool - Google Patents

Abstract

The application relates to the technical field of high-end underground equipment, in particular to a static directional build-up rate controllable guide drilling tool, which comprises a torque transmission positioning device and a flexible controllable guide device, wherein the torque transmission positioning device and the flexible controllable guide device are in threaded connection; the torque transmission positioning device consists of an upper joint, a telescopic spline shaft, a semicircular joint, an outer pipe, a spline shaft sleeve, a main transmission shaft, a bearing string, a spring, a probe and a positioning guide pipe joint; the flexible controllable guiding device consists of a spline flexible short section, a guiding pipe lower joint and a drill bit joint; the drilling tool realizes the integral positioning of the drilling tool through the probe in the positioning guide pipe joint, the guiding direction of the drilling tool is finally determined through the phase difference between the probe and the tile-shaped curved surface slot on the guide pipe, and the guide pipe and a plurality of spline flexible short sections inside the guide pipe can bend and incline towards one side with the tile-shaped curved surface slot, so that the controllable guiding drilling is realized. The method has the advantages of adjustable build rate, static pointing, simple structure and easiness in operation.

Description

Static directional type controllable steerable drilling tool

technical field

The invention relates to the technical field of high-end downhole equipment, in particular to a static pointing type controllable steerable drilling tool.

Background technique

At present, domestic soil and groundwater pollution is prominent, and it has shown a trend of developing from point-like pollution to belt-like and surface-like pollution. The in-situ remediation method for large-area contaminated sites requires a large number of vertical remediation boreholes to be drilled in the contaminated site, resulting in large drilling workload, small diffusion radius of remediation agents, long construction period and high cost. Horizontal well technology can effectively reduce the number of vertical holes and increase the area of single-hole radiation repair. The key to the multi-branch horizontal well technology is the inclination of the wellbore, so that the inclination angle is at or close to 90°, and the wellbore has a certain length along the horizontal direction.

Various drilling tools for wellbore deflection can be divided into static and dynamic steerable tools according to the operating state; according to the steerable deflection mechanism, they can be divided into two types: push-back type and pointing type, among which static push-back type and dynamic directional type steering The drilling tools are relatively mature, but the above deflecting tools have a remarkable deflecting effect in hard formations. However, for soil layers undergoing soil remediation and broken and loose strata, deflecting is difficult, and the steerable drilling azimuth and well inclination are not easy to control.

SUMMARY OF THE INVENTION

In order to overcome the disadvantages of the existing steerable deflecting tool in the soil layer and broken loose stratum, such as difficulty in horizontal deflecting, large deflecting rate, and difficulty in controlling the directional drilling azimuth and well inclination angle, the present invention provides a deflecting tool with a small deflecting radius and a low deflecting radius. Steering drilling tool with stable inclination, easy control of directional drilling azimuth and inclination angle, and easy operation.

A static directional type controllable steerable drilling tool provided by the application adopts the following technical solutions:

A static directional type controllable steerable drilling tool for slope build-up is composed of a torsion transmission positioning device and a flexible controllable guiding device. The upper part of the controllable guide device is characterized in that the torque transmission and positioning device is composed of an upper joint, a telescopic spline shaft, a semicircular joint, an outer tube, a spline shaft sleeve, a main drive shaft, a positioning guide pipe joint, a bearing string, a spring, The TC bearing A and the TC bearing B are composed. The upper joint is connected with the upper part of the telescopic spline shaft. The upper step of the telescopic spline shaft is sleeved with the TC bearing B, which is fixed by the upper joint. The middle step of the telescopic spline shaft The upper sleeve is provided with a semicircular joint, and the step of the inner hole of the semicircular joint is consolidated with a TC bearing A. The TC bearing A and the TC bearing B are in rotatable contact. Two sealing rings are installed in the two grooves of the inner hole of the semicircular joint. The semicircular joint The lower part is connected with the outer tube by threads; a spring is sleeved under the step in the middle of the telescopic spline shaft, the lower part of the spring is a spline sleeve and contacts with it, the spline sleeve is sleeved on the bottom optical axis of the telescopic spline shaft, and the spline shaft The inner hole of the sleeve is provided with a sealing groove, and a sealing ring A is installed in the sealing groove. The lower part of the spline sleeve is threaded with the main drive shaft, and the main drive shaft is sleeved with a bearing string; the lower part of the outer tube is connected to the positioning guide tube. The joints are connected by thread. The positioning guide pipe joint is sleeved on the thin shaft of the main drive shaft and is in contact with the bearing string. The inner hole of the positioning guide pipe joint is provided with two sealing grooves, and two sealing grooves are installed in the sealing groove. Ring A.

The threaded shaft at the lower part of the semicircular joint in the torque transmission and positioning device is provided with a semicircular clutch B, and a semicircular clutch A is arranged on the middle step of the telescopic spline shaft. The semicircular clutch A and the semicircular clutch B can be engaged and separated, and the separation distance is c. ; A TC bearing A is consolidated on the inner hole step of the semicircular joint, and a TC bearing B is sleeved on the upper step of the telescopic spline shaft, and the TC bearing A is in contact with the TC bearing B and can slide; the inner hole of the semicircular joint is provided with There are two sealing grooves, and a sealing ring is installed in the sealing grooves.

The lower end surface of the step in the middle of the telescopic spline shaft in the described torque transmission and positioning device is connected with the upper end of the spring, the lower end of the spring is connected with the spline shaft sleeve, the spline shaft sleeve is provided with a sealing groove, and the sealing ring A is installed in the sealing groove; The lower part of the telescopic spline shaft is the outer spline, the inside of the spline sleeve is the inner spline, the two can realize sliding engagement, and the lower part of the telescopic spline shaft is the optical shaft, which can slide in the light hole of the spline sleeve .

The main drive shaft and the spline shaft sleeve are threadedly connected, a bearing string is installed under the step of the main drive shaft, the lower part of the bearing string is a positioning guide pipe joint, and the positioning guide pipe joint is also sleeved on the main drive shaft, and the positioning guide pipe There are two sealing grooves on the joint, and two sealing rings A are installed in the sealing grooves.

The telescopic spline shaft, spring, spline shaft sleeve, and main drive shaft are all located in the outer tube, and are fixed up and down through the semicircular joint and the positioning guide pipe joint. For threaded connection.

The positioning guide pipe joint is composed of a cover plate, a spring A, a probe rod, a rectangular seal and a hexagon socket head screw. The spring A is fixed in the annular deep hole on the left side of the cover plate, and the stepped end of the probe rod is inserted into the hole. It is fixed in spring A, the other end of the probe is inserted into the cylindrical hole on the right side of the cover plate and fixed, the cover plate and the positioning guide pipe joint are fixed by four inner hexagon bolts, and the outer hole of the positioning guide pipe joint is provided with a rectangular sealing groove , a rectangular seal is installed in the sealing groove.

The flexible controllable guide device is composed of a spline flexible short joint, a guide pipe, a lower joint of the guide pipe, a drill bit joint, a drill bit, a TC bearing C and a TC bearing D, and the spline flexible short joint and the lower part of the main drive shaft are threadedly connected. , the multiple spline flexible short joints are threaded; the upper and lower parts of the guide pipe are respectively connected with the positioning guide pipe joint and the guide pipe lower joint, and the last spline flexible short joint in the guide pipe is threaded with the drill bit joint. , the drill bit joint and the bottom drill bit are connected by thread; TC bearing D is consolidated on the outer surface of the drill bit joint, TC bearing C is consolidated on the inner hole surface of the joint under the guide tube, TC bearing C and TC bearing D are in rotatable contact relationship.

The spline flexible short joint is located in the guide pipe, the spline flexible short joint and the main drive shaft are threadedly connected, the guide pipe and the positioning guide pipe joint are threadedly connected, and the spline flexible short joints are connected by a thread. Threaded connection.

The spline flexible short joint is composed of a female joint, an O-type sealing ring A, a male joint, an O-type sealing ring B, an O-type sealing ring C, a ball seat and a spline sleeve. The male joint is located in the female joint, and the male joint is located in the female joint. The spherical outer surface of the upper part is in contact with the spherical inner surface of the female joint. The spherical surface of the male joint is provided with upper and lower sealing grooves. The lower surface is in contact with the curved surface of the ball seat, the outer cylindrical surface of the ball seat is provided with a sealing groove, and the sealing groove is an O-type sealing ring C, the ball seat is in contact with the inner hole surface of the female joint, and the bottom of the ball seat is in contact with the spline sleeve.

The spline sleeve and the female joint are connected by threads, and the external thread of the male joint can be connected with the upper inner threaded hole of the female joint of the next spline flexible short section; the upper part of the male joint is a spherical surface, which is connected with The inner surface of the contacting female connector is also spherical.

The inner surface of the spline sleeve is provided with internal splines, the shaft under the spherical surface of the male joint is provided with external splines, the internal splines are engaged with the external splines, and the teeth of the external splines and the internal splines have a height difference, The heights of the two spline teeth gradually decrease from top to bottom; the central axis of the male joint and the central axis of the female joint can be inclined at an axial maximum angle of θ=3°.

The outer spline teeth of the male joint and the inner spline teeth of the spline sleeve can be meshed symmetrically along the central axis of the female joint, or can be meshed with a deflection θ=0°-3° along the central axis of the female joint.

The male joint in the last spline flexible short section in the guide tube is connected by a thread with the drill bit, and the drill bit and the drill are connected by a thread; the outer cylindrical surface of the drill bit is fixed with a TC bearing D. There is a threaded connection between the lower joint of the guide tube and the guide tube, the inner hole of the lower joint of the guide tube is fixed with a TC bearing C, and the TC bearing D is in contact with the TC bearing C and can be rotated.

The pipe body of the guide pipe is provided with a plurality of tile-shaped curved surface slits, the tile-shaped curved surface slits are equally spaced along the central axis of the guide pipe, and the curved surface welding plates are welded on several tile-shaped slits in the middle and lower part of the guide pipe. .

The present invention includes at least one of the following beneficial effects:

1. The static directional type controllable build-up rate steering drilling tool in this application has a simple structure, small build-up radius, controllable static directional-steering, controllable build-up rate, reasonable design, and has extremely high promotion value.

2. The static point type build-up rate controllable steerable drilling tool is positioned by the angle difference between the probe installed in the positioning guide pipe joint and the tile-shaped curved surface welds that are equally spaced on the guide pipe body, and then through the probe to the direction. The ground control equipment sends the azimuth coordinates, so that the precise azimuth positioning of the whole drilling tool can be realized.

3. There are spline flexible short joints connected by threads in the guide pipe of the static directional type controllable steerable drilling tool. The threaded connection between the male joint and the female joint in the key flexible sub joint realizes torque transmission; the guide pipe cooperates with the multiple spline flexible sub joints distributed in the guide pipe to realize the accurate control of the wellbore by the drilling tool according to the given WOB. The inclination angle of the well can be controlled to realize the controllable drilling of the build-up rate.

4. The engagement and separation of the telescopic spline shaft in the static directional build-rate controllable steering drilling tool and the semi-circular clutch A and the semi-circular clutch B on the semi-circular joint can realize the overall rotation of the drilling tool, as well as the outer tube and steering Pipe and positioning guide pipe joints do not rotate, and other drilling tool parts such as drill bits rotate. When the drill bit does not reach the bottom of the well, the semicircular clutch A on the telescopic spline shaft meshes with the semicircular clutch B on the semicircular joint under the action of the spring, and the outer spline on the telescopic spline shaft and the inner spline on the spline sleeve are engaged. The splines are disengaged, thereby realizing the overall rotation of the drilling tool; when the drill bit reaches the bottom of the well, the spring is compressed due to the gravity of the drilling tool and the pressure on bit, and the semicircular clutch A on the telescopic spline shaft is in contact with the semicircular joint. The semi-circular clutch B is disengaged and engaged, and the outer splines on the telescopic spline shaft are slidingly engaged with the inner splines on the spline sleeve, so that the outer tube, guide tube and positioning guide tube joints do not rotate, and other internal parts such as drill bits are rotated and drilled. , at this time, the guide pipe does not rotate but gradually bends and follows up with the drilling of the drill bit, so as to realize the stable and reliable static directional directional drilling of the drilling tool.

5. The guide tube is provided with a plurality of tile-shaped curved surface slits equidistantly distributed along its central axis, which ensures that the guide tube controls the spline flexible short section to bend in the direction of the slits; multiple tiles in the middle and lower part of the guide tube The curved surface welding plate is welded on the curved surface slit, which can effectively prevent the guide tube from breaking, and realize stable and efficient deflection guide drilling.

Description of drawings

1 is a schematic diagram of the overall structure of a static directional type controllable steerable drilling tool in an embodiment of the present application;

2A, 2B are respectively the structural representation of the spline flexible short joint of the present invention;

3A and 3B are respectively a schematic diagram of the engagement and separation of the semicircular clutch A and the semicircular clutch B on the telescopic spline shaft and the semicircular joint of the present invention;

Fig. 4 is the A-A sectional view that embodies the internal structure of the present invention;

Fig. 5 is the concrete structural representation of semicircular joint;

Fig. 6 is the concrete structure schematic diagram of telescopic spline shaft;

Fig. 7 is the partial enlarged schematic diagram of D part in Fig. 1;

Fig. 8 is the B-B sectional view that embodies the internal structure of the present invention;

9 is a C-C sectional view embodying the internal structure of the present invention;

Fig. 10 is the unfolded schematic diagram that embodies the specific structure of the guide tube;

Description of reference numbers:

1. Upper joint; 2. Telescopic spline shaft; 21. External spline teeth of telescopic spline shaft; 22. Semicircular clutch A; 23. Step in the middle of telescopic spline shaft; 3. Semicircular joint; 31. Semicircular clutch B; 4. Outer tube; 5. Spline bushing; 51. Spline tooth in spline bushing; 6. Main drive shaft; 7. Positioning guide pipe joint; 71. Cover plate; 72. Spring A; 73. Probe Rod; 74, rectangular seal; 75, socket head cap screw; 8, spline flexible nipple; 81, female joint; 82, O-ring A; 83, male joint; 831, male joint male spline; 84, O-ring B; 85, O-ring C; 86, ball seat; 87, spline sleeve; 871, inner spline of spline sleeve; 9, guide tube; 91, curved welding plate; 92, tile-shaped curved surface kerf; 10, lower joint of guide pipe; 11, drill bit joint; 12, drill bit; 13, TC bearing C; 14, TC bearing D; 15, sealing ring A; 16, bearing string; 17, spring; 18, sealing ring ; 19, TC bearing A; 20, TC bearing B.

Detailed ways

The present application will be further described in detail below in conjunction with accompanying drawings 1-10.

The embodiment of the present application discloses a static directional type controllable steerable drilling tool. Referring to Fig. 1, Fig. 4 and Fig. 6, the static point type build-up rate controllable steerable drilling tool is composed of a torsion transmission positioning device and a flexible controllable guiding device. The device is located on the upper part of the flexible and controllable guide device. The torque transmission and positioning device consists of an upper joint 1, a telescopic spline shaft 2, a semicircular joint 3, an outer tube 4, a spline bushing 5, a main drive shaft 6, a positioning guide pipe joint 7, and a bearing. String 16, spring 17, TC bearing A19, TC bearing B20. In this embodiment, the end with the upper joint 1 is defined as the upper end of the drilling tool, and the end with the drill bit 12 is defined as the lower end of the drilling tool. The upper joint 1 and the upper part of the telescopic spline shaft 2 are threadedly connected. The upper step 23 of the telescopic spline shaft 2 is sleeved with a TC bearing B20, which is fixed by the upper joint 1. The middle step of the telescopic spline shaft 2 is sleeved with a Semicircular joint 3, TC bearing A19 is consolidated on the step of the inner hole of semicircular joint 3, TC bearing A19 and TC bearing B20 are in rotatable contact, two sealing grooves are arranged in the inner hole of semicircular joint 3, and two sealing grooves are installed in the sealing groove. The sealing ring 18, the lower part of the semicircular joint 3 and the outer tube 4 are threadedly connected; a spring 17 is sleeved under the step in the middle of the telescopic spline shaft 2, and the lower part of the spring 17 is the spline shaft sleeve 5 and contacts with it, and the spline shaft sleeve 5 is sleeved on the On the bottom optical axis of the telescopic spline shaft 2, the inner hole of the spline shaft sleeve 5 is provided with a sealing groove, and a sealing ring A15 is installed in the sealing groove. The main drive shaft 6 is sleeved with a bearing string 16; the lower part of the outer tube 4 and the positioning guide pipe joint 7 are threadedly connected, and the positioning guide pipe joint 7 is sleeved on the thin shaft of the main drive shaft 6 and is in contact with the bearing string 16. , The inner hole of the positioning guide pipe joint 7 is provided with two sealing grooves, and two sealing rings A15 are installed in the sealing grooves.

The flexible controllable guide device is composed of spline flexible short joint 8, guide tube 9, guide tube lower joint 10, drill bit joint 11, drill bit 12, TC bearing C13 and TC bearing D14, spline flexible short joint 8 and main drive shaft 6 The lower part is threaded connection, and the multiple spline flexible short joints 8 are threaded; The key flexible short joint 8 is connected with the drill bit joint 11 by thread, and the drill bit joint 11 and the bottom drill bit 12 are connected by thread; On the hole surface, TC bearing C13 and TC bearing D14 are in rotatable contact relationship.

2A, 2B and 9, the spline flexible short joint 8 in the flexible controllable guide device is composed of a female joint 81, an O-ring A82, a male joint 83, an O-ring B84, an O-ring C85, a ball The seat 86 and the spline sleeve 87 are composed, the male joint 83 is located in the female joint 81, the spherical outer surface of the upper part of the male joint 83 is in contact with the spherical inner surface of the female joint 81, and the spherical surface of the male joint 83 is provided with two upper and lower sealing recesses. O-ring A82 and O-ring B84 are installed in the sealing groove in sequence, the spherical lower surface of the male joint 83 is in contact with the curved surface of the ball seat 86, the outer cylindrical surface of the ball seat 86 is provided with a sealing groove, the sealing groove An O-ring C85 is installed inside, the ball seat 86 is in contact with the inner hole surface of the female joint 81, the spline sleeve 87 is under the ball seat 86, and the spline sleeve 87 and the female joint 81 are threadedly connected. The external thread can be connected with the upper internal thread hole of the female joint 81 of the next spline flexible short joint 8 .

The upper part of the male joint 83 is a spherical surface, and the inner surface of the female joint 81 in contact with it is also a spherical surface; the inner surface of the spline sleeve 87 is an inner spline 871, and the male joint 83 has an outer spline 831 under the spherical surface. The external spline 831 can be engaged obliquely, the key teeth of the external spline 831 and the internal spline 871 have a height difference, the height of the two spline teeth gradually decreases from top to bottom, and the central axis of the male joint 83 and the central axis of the female joint 81 can be adjusted. The inclination angle θ=0°-3° in the axial direction.

Referring to Figures 1, 3A, 3B, 5 and 6, there is a semicircular clutch A22 on the middle step of the telescopic spline shaft 2 in the torque transmission positioning device, a semicircular clutch B31 on the lower threaded shaft of the semicircular joint 3, a semicircular clutch A22 and a semicircular clutch B31 can be contact-engaged.

The lower end face of the step in the middle of the telescopic spline shaft 2 is connected with the upper part of the spring 17, the lower part of the spring 17 is connected with the spline shaft sleeve 5, and the outer spline shaft key teeth 21 at the bottom of the telescopic spline shaft 2 are connected with the spline shaft sleeve. 5. The internal spline teeth 51 can be slidably engaged to realize torque transmission.

1, 7 and 8, the positioning guide pipe joint 7 in the torque transmission positioning device is composed of a cover plate 71, a spring A72, a probe rod 73, a rectangular seal 74 and a hexagon socket head screw 75. The inner left side of the cover plate 71 is provided with a The annular groove is provided with a cylindrical groove on the right, the spring A72 is fixed in the annular groove on the left, the stepped end of the probe rod 73 extends into the spring A72, and the other end of the probe rod 73 is inserted into the cover plate In the right cylindrical groove of 71 , the cover plate 71 is fixed with the positioning guide pipe joint 7 by four hexagon socket screws 75 , and the rectangular seal 74 is located in the rectangular groove of the positioning guide pipe joint 7 .

1 and 10 , the tube body of the guide tube 9 in the flexible controllable guide device is provided with a plurality of tile-shaped curved surface slits 92, and the tile-shaped curved surface slits 92 are equally spaced along the central axis of the guide tube 9. Curved welding plates 91 are welded on several tile-shaped curved curved slits 92 at the lower part.

When the static directional type controllable steerable drilling tool works, firstly assemble the drilling tool as a whole on the ground; specifically: confirm that the semicircular clutch A22 on the middle step of the telescopic spline shaft 2 is connected to the elastic force of the spring 17 under the action of the spring 17 The semicircular clutch B31 at the lower part of the semicircular joint 3 is in a complete meshing state; the external spline tooth 21 at the lower part of the telescopic spline shaft 2 and the internal spline tooth 51 of the spline sleeve 3 are in a non-engaging state, and compress the telescopic spline shaft 2. The compression spring 17 can slide down; the multiple spline flexible short joints 8 are threadedly connected and installed in the guide pipe 9; The phase difference of the curved slit 92 .

After the above work is completed, the upper sub 1 and other downhole drilling tools can be threadedly connected, and then the well can be entered as a whole. The rotating torque is transmitted to the upper joint 1, and the upper joint 1 drives the telescopic spline shaft 2 to rotate. Due to the elastic force of the spring 17, the semicircular clutch A22 on the middle step of the telescopic spline shaft 2 is connected to the semicircular joint 3 under the action of the elastic force of the spring 17. The lower half-circle clutch B31 is in a complete meshing state, and the outer spline teeth 21 at the lower part of the telescopic spline shaft 2 and the inner spline teeth 51 of the spline sleeve 3 are in a non-engaging state, so the entire static directional build rate is controllable The steerable drilling tool rotates along with other downhole drilling tools, and the phase of the probe rod 73 is determined by the equipment on the ground, so that the overall rotation of the drilling tool determines the phase of the tile-shaped curved surface slit 92 on the guide pipe 9, and the steering orientation is controllable.

When the bit 12 of the static directional build rate controllable steerable drilling tool contacts the bottom of the hole, under the action of the gravity and WOB of other downhole drilling tools, the spring 17 is compressed, so that the outer spline teeth of the lower part of the telescopic spline shaft 2 are compressed. 21 and the inner spline teeth 51 of the spline bushing 3 are in meshing state, other downhole drilling tools transmit the rotational torque to the upper joint 1, and the upper joint 1 drives the telescopic spline shaft 2 to rotate, so that the telescopic spline shaft 2 drives the main shaft. Transmission shaft 6, spline flexible short joint 8, drill bit joint 11 and drill bit rotate to break rock; at this time, the semicircular clutch A22 on the middle step of the telescopic spline shaft 2 and the semicircular clutch B31 at the lower part of the semicircular joint 3 are in a disengaged state, and the semicircular joint is in a disengaged state. 3. The outer pipe 4, the positioning guide pipe joint 7, the guide pipe 9 and the guide pipe lower joint 10 do not rotate with the telescopic spline shaft 2, so that the flexible and controllable guiding device at the lower part of the drilling tool can realize static directional drilling.

When the pump pressure continues to increase and all the spline flexible short joints 8 in the guide tube 9 are subjected to greater pressure, since the upper part of the male joint 83 in the splined flexible short joint 8 is spherical, the female joint 81 in contact with it has a spherical surface. The inner surface is also a spherical surface, the inner surface of the spline sleeve 87 is an inner spline 871, and the male joint 83 is an outer spline 831 under the spherical surface. The key teeth of the key 871 have a height difference, and the heights of the two spline teeth gradually decrease from top to bottom, so the central axis of the male joint 83 and the central axis of the female joint 81 in each spline flexible short joint 8 can be axially adjustable. With an inclination of 0°-3°, the guide pipe 9 and its multiple spline flexible short joints 8 inside can realize horizontal well drilling with adjustable build rate according to the weight on bit applied to the upper joint 1 , the applied WOB is large, the build-up rate is large, and the applied WOB is small, the build-up rate is small; the guide pipe 9 is provided with a plurality of tile-shaped curved surface slits 92, so the guide pipe will have tile-shaped curved surface slits 92. One side of the guide pipe 9 is bent in the direction of one side, so that the inclination of the plurality of spline flexible short joints 8 in the guide pipe 9 is fixed; the drilling fluid enters from the upper joint 1, along the telescopic spline shaft 2, the spline sleeve 5, the main The transmission shaft, spline flexible short joint 8, and the center hole of the drill bit joint 11 flow into the drill bit 12, and the drilling fluid then flows out from the hole of the drill bit 12, carrying the broken rock back to the surface; , semicircular joint 3, outer pipe 4, positioning guide pipe joint 7 and guide pipe lower joint 10 only follow the drilling of the drill bit to bend and do not rotate to realize static directional directional drilling.

The static point type build-up rate controllable steerable drilling tool can accurately control the orientation and inclination of the horizontal wellbore through the torsion transmission positioning device and the flexible controllable steering device, which solves the problem of the existing steerable drilling tool in the soil layer or broken loose stratum. Due to the soft soil, it is difficult to build the slope, the slope is large, and the positioning and guidance are inaccurate. promotion significance.

The above are the preferred embodiments of the application, and are not intended to limit the protection scope of the application. Therefore: all equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application. .

Claims (7)

1. A static directional type slope making rate controllable guiding drilling tool comprises a torque transmission positioning device and a flexible controllable guiding device, wherein the torque transmission positioning device and the flexible controllable guiding device are in threaded connection, and the torque transmission positioning device is positioned on the upper portion of the flexible controllable guiding device and is characterized in that the torque transmission positioning device comprises an upper connector (1), a telescopic spline shaft (2), a semicircular connector (3), an outer pipe (4), a spline shaft sleeve (5), a main transmission shaft (6), a positioning guide pipe connector (7), a bearing string (16), a spring (17), a TC bearing A (19) and a TC bearing B (20), the upper connector (1) is in threaded connection with the upper portion of the telescopic spline shaft (2), the TC bearing B (20) is sleeved at an upper step (23) of the telescopic spline shaft (2) and fixed through the upper connector (1), the semicircular connector (3) is sleeved on a middle step of the telescopic spline shaft (2), a TC bearing A (19) is fixedly connected to a step of an inner hole of the semicircular joint (3), the TC bearing A (19) is in rotatable contact with a TC bearing B (20), two sealing grooves are formed in the inner hole of the semicircular joint (3), two sealing rings (18) are installed in the sealing grooves, and the lower portion of the semicircular joint (3) is in threaded connection with the outer pipe (4); a spring (17) is sleeved below a step in the middle of the telescopic spline shaft (2), the lower part of the spring (17) is a spline shaft sleeve (5) and is in contact with the spline shaft sleeve, the spline shaft sleeve (5) is sleeved on a bottom optical axis of the telescopic spline shaft (2), a sealing groove is formed in an inner hole of the spline shaft sleeve (5), a sealing ring A (15) is installed in the sealing groove, the lower part of the spline shaft sleeve (5) is in threaded connection with the main transmission shaft (6), and a bearing string (16) is sleeved on the main transmission shaft (6); the lower part of the outer pipe (4) is in threaded connection with a positioning guide pipe joint (7), the positioning guide pipe joint (7) is sleeved on the thin optical axis of the main transmission shaft (6) and is in contact with a bearing string (16), two sealing grooves are arranged in the inner hole of the positioning guide pipe joint (7), and two sealing rings A (15) are arranged in the sealing grooves; the flexible controllable guiding device is composed of spline flexible short sections (8), a guiding pipe (9), a guiding pipe lower joint (10), a drill bit joint (11), a drill bit (12), a TC bearing C (13) and a TC bearing D (14), wherein the spline flexible short sections (8) are in threaded connection with the lower part of the main transmission shaft (6), and a plurality of spline flexible short sections (8) are in threaded connection; the upper part and the lower part of the guide pipe (9) are respectively in threaded connection with a positioning guide pipe joint (7) and a guide pipe lower joint (10), the last spline flexible short section (8) in the guide pipe (9) is in threaded connection with a drill bit joint (11), and the drill bit joint (11) is in threaded connection with a bottom drill bit (12); the TC bearing D (14) is fixedly connected with the outer surface of the drill bit joint (11), the TC bearing C (13) is fixedly connected with the inner hole surface of the guide pipe lower joint (10), and the TC bearing C (13) and the TC bearing D (14) are in rotatable contact relation.

2. The static directional build rate controllable pilot drilling tool of claim 1, wherein: the spline flexible short section (8) in the flexible controllable guiding device consists of a female joint (81), an O-shaped sealing ring A (82), a male joint (83), an O-shaped sealing ring B (84), an O-shaped sealing ring C (85), a ball seat (86) and a spline housing (87), wherein the male joint (83) is positioned in the female joint (81), the spherical outer surface of the upper part of the male joint (83) is contacted with the spherical inner surface of the female joint (81), the spherical surface of the male joint (83) is provided with an upper sealing groove and a lower sealing groove, the O-shaped sealing ring A (82) and the O-shaped sealing ring B (84) are sequentially arranged in the sealing grooves, the spherical lower surface of the male joint (83) is contacted with the curved surface of the ball seat (86), the outer cylindrical surface of the ball seat (86) is provided with a sealing groove, the O-shaped sealing ring C (85) is arranged in the sealing groove, and the ball seat (86) is contacted with the inner hole surface of the female joint (81), a spline sleeve (87) is arranged below the ball seat (86), the spline sleeve (87) is in threaded connection with the female joint (81), and the external thread of the male joint (83) can be connected with the upper internal thread hole of the female joint (81) of the next spline flexible short section (8).

3. The static directional build rate controllable pilot drilling tool of claim 2, wherein: the upper part of the male joint (83) is spherical, and the inner surface of the female joint (81) which is in contact with the male joint is also spherical; the inner surface of the spline housing (87) is provided with an internal spline (871), the spherical surface of the male joint (83) is provided with an external spline (831), the internal spline (871) and the external spline (831) are in inclined meshing, the spline teeth of the external spline (831) and the internal spline (871) have height difference, and the heights of the spline teeth of the two splines are gradually reduced from top to bottom.

4. The static directional build rate controllable pilot drilling tool of claim 1, wherein: the middle step of the telescopic spline shaft (2) is provided with a semicircular clutch A (22), the lower threaded shaft of the semicircular joint (3) is provided with a semicircular clutch B (31), and the semicircular clutch A (22) is engaged with the semicircular clutch B (31).

5. The static directional build rate controllable pilot drilling tool of claim 1, wherein: the lower end face of the middle step of the telescopic spline shaft (2) is connected with the upper end of a spring (17), and the lower end of the spring (17) is connected with the spline shaft sleeve (5); the external spline shaft key teeth (21) at the bottom of the telescopic spline shaft (2) are in slidable engagement with the internal spline shaft teeth (51) of the spline shaft sleeve (5).

6. The static directional build rate controllable pilot drilling tool of claim 1, wherein: the positioning guide pipe joint (7) is composed of a cover plate (71), a spring A (72), a probe (73), a rectangular sealing piece (74) and inner hexagon screws (75), wherein the left side inside the cover plate (71) is provided with an annular groove, the right side is provided with a cylindrical groove, the spring A (72) is fixedly connected in the annular groove on the left side, one end, with a step, of the probe (73) extends into the spring A (72), the other end of the probe (73) is inserted into the cylindrical groove on the right side of the cover plate (71), the cover plate (71) is fixed with the positioning guide pipe joint (7) through the four inner hexagon screws (75), and the rectangular sealing piece (74) is located in the rectangular groove of the positioning guide pipe joint (7).

7. The static directional build rate controllable pilot drilling tool of claim 1, wherein: the guide pipe is characterized in that a plurality of tile-shaped curved surface slots (92) are formed in the pipe body of the guide pipe (9), the tile-shaped curved surface slots (92) are distributed at equal intervals along the central axis of the guide pipe (9), and curved surface welding plates (91) are welded on a plurality of tile-shaped curved surface slots (92) in the middle lower portion of the guide pipe.

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