CN216381353U - Automatic bit feeding flexible drilling tool - Google Patents

Abstract

The utility model belongs to the technical field of drilling and boring, and particularly relates to an automatic bit feeding flexible drilling tool which comprises a drill bit, a plurality of bit feeding short sections and a joint short section serial connection, wherein an annular cavity and a spacer ring are arranged in the bit feeding short sections, so that a low-pressure cavity is isolated in the annular cavity, and a first through hole for communicating the low-pressure cavity with the annular cavity is formed in the bit feeding short sections. In the drilling process, low-pressure liquid is arranged outside the bit feeding short section, and high-pressure liquid is arranged inside a push rod part in the bit feeding short section, so that the spacer ring is forced to bear the thrust to one side of the low-pressure cavity, and the effects of pushing a drilling tool to advance and flexibly applying drilling pressure are achieved; this automatic flexible drilling tool of sending to bore is connected with flexible drilling rod, all connects through the joint nipple joint between the adjacent nipple joint, has shortened the rigidity length of instrument combination greatly, helps solving the direction of small curvature radius and creeps into the in-process, and the backing is pressed seriously, send the actual problem of boring the difficulty.

Description

Automatic bit feeding flexible drilling tool

Technical Field

The utility model belongs to the technical field of exploration drilling tools, and particularly relates to an automatic bit feeding flexible drilling tool.

Background

In the field of oil and gas exploration, the guided drilling technology can artificially control a well track to drill towards a pre-designed target layer, the technology enables a drill bit to bypass obstacles to reach an oil reservoir and can explore scattered oil reservoirs and heavy oil reservoirs, and the guided drilling technology has more advantages than the traditional straight well type exploration.

In the prior art, chinese patent publication No. CN2135055Y describes a flexible articulated steerable drilling tool for drilling, and chinese patent publication No. CN2548742Y describes a ball joint universal joint in a multi-axis drill.

However, current drilling tools also have the following disadvantages: firstly, the rigid section of the conventional guide drilling tool is long, and a small-curvature-radius well section with large turning amplitude is difficult to drill in the drilling process; secondly, the drilling tool has a pressure-bearing phenomenon in the drilling process, that is, due to the excessive friction between the downhole drilling tool and the well wall, the drilling pressure is completely applied to the drilling tool and cannot be applied to a drill bit, and the drilling process can be blocked or blocked, so that the drilling is slow.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an automatic bit feeding flexible drilling tool, which solves the technical problem that the flexible drilling tool in the prior art is difficult to get rid of difficulties after pressure is generated in the drilling process.

In order to solve the technical problems, the utility model is realized by the following technical means:

an automatic bit feeding flexible drilling tool comprises a drill bit, a plurality of bit feeding short sections and a joint short section serial. The joint short section tandem comprises a plurality of joint short sections, and each joint short section comprises a joint structure which is used for connecting the joint short sections in a deflecting mode; the bit feeding short section comprises a combined sleeve cylinder and can generate axial thrust under the hydraulic action to push the drill bit to advance; when the automatic bit-feeding flexible drilling tool comprises a plurality of bit-feeding short sections, the bit-feeding short sections are connected by adopting a joint structure; the drill feeding short section and the joint short section are connected by adopting a joint structure; the drill bit is arranged at the lower end of the bit feeding short section or the joint short section; the automatic bit feeding flexible drilling tool at least comprises a bit feeding short section, and the bit feeding short section is arranged at the lower half section of the automatic bit feeding flexible drilling tool; the distance between the joint structure deflection points on the two sides of the bit feeding short section is 1-5 times of the diameter of the drill bit, and the distance between the joint structure deflection point in the joint short section and the adjacent joint structure deflection point is 0.5-4 times of the diameter of the drill bit.

Preferably, a thrust piston is arranged in the bit feeding short section, and the thrust piston comprises a push rod part and a spacer ring; hydraulic cavities are respectively arranged above and below the spacer ring; the drilling tool comprises a low-pressure cavity, a drilling nipple, a drilling tool body and a drilling tool body, wherein at least one cavity is communicated with a flow channel in the drilling tool body, a first through hole for communicating the low-pressure cavity with the annulus is formed in the drilling nipple, and the other cavity is communicated with the annulus through the first through hole.

A hollow thrust piston is arranged in the bit feeding short section and comprises a push rod part and a connecting joint part; at least one annular cavity is arranged between the push rod part and the inner wall of the bit feeding short section, a spacer ring is arranged in the annular cavity to isolate a low-pressure cavity, and a first through hole for communicating the low-pressure cavity with the annulus is formed in the bit feeding short section;

the rear end of the bit feeding short section is provided with a hollow bit feeding joint, a connecting structure used for installing a connecting joint part is arranged in the bit feeding joint, the connecting joint part can be assembled in the connecting structure in a threaded mode, when the push rod part moves in the bit feeding short section along the axial direction, the connecting joint part can apply thrust to the bit feeding joint. It should be noted that the bit feeding sub can be used in an inverted manner, and the bit feeding sub is arranged on one side of the bit feeding sub close to the drill bit or the bit feeding sub is arranged on one side of the bit feeding sub far away from the drill bit.

Preferably, the automated bit-feed flexible drilling tool comprises a plurality of bit-feed subs.

Preferably, the bit feeding joint and the bit feeding short joint can be integrally formed to form a shell, the shell is divided into two parts which can move relatively but are not detachable through a closed continuous curve gap, and the axial displacement of the thrust piston is limited through the gap. Or divided in a form of embedding, and the relative motion mainly means that the axial relative displacement between the two can be satisfied. Meanwhile, when the lower section shell which is divided by the closed continuous curve gap or consists of the embedded tooth structure is hung on the upper section shell, the weight of the lower drilling tool combination and the axial tension in the process of lifting the drilling tool can be borne, when the upper and lower sections shells are tightly attached, the drilling pressure can be transmitted, and the arrangement of the axial relative displacement meets the requirement that the pushing piston pushes the drill feeding joint to advance when the drilling pressure is supported.

Or the bit feeding joint and the bit feeding short section are respectively designed and combined, the connecting joint part can be directly connected and fixed with the bit feeding joint through threads, the axial displacement of the thrust piston is limited by the bit feeding short section joint and the spacing ring or the limiting ring, when the bit feeding short section joint is tightly attached to the shoulder of the bit feeding joint, the bit pressure can be transmitted, and during pressure supporting, the axial thrust of the thrust piston pushes the bit feeding joint to move forwards. And in the process of lifting or lowering, the weight of the lower drilling tool is suspended from the bit-feeding short joint by the spacing ring.

Preferably, the inner wall of the bit feeding short section, the outer wall of the push rod part and the spacer ring are arranged in the annular cavity to further isolate a high-pressure cavity, and the push rod part is provided with a second through hole communicated with the high-pressure cavity and the push rod part.

Preferably, the bit feeding short section comprises at least one section of connecting sleeve, the front end or/and the rear end of the connecting sleeve is/are connected with a hollow connector, and the annular cavity is located between the corresponding end faces of the connecting sleeve inner wall, the push rod part outer wall and the connector.

Preferably, the drilling device also comprises a guiding power nipple and/or a drill bit which are arranged at the front end of the joint nipple serial string, wherein the drilling feeding nipple is connected in series at any position in the joint nipple serial string and can be matched with the guiding power nipple to complete guiding drilling;

each joint short section comprises a first shell and a second shell which are connected in a front-back mode, and the first shell can turn a certain angle relative to the second shell; the guiding power nipple can be any tool or combination of tools which can realize the guiding function and provide the well bottom power for drilling;

and communicated flow passages are arranged in each joint short section, the drill feeding short section, the guiding power short section and the drill bit. It should be noted that the first housing and the second housing may be integrally formed integral housings with angles.

Preferably, the connecting shaft inside the bit feeding short section is of a hollow cylinder structure, the second end shaft part and the third end shaft part of the connecting shaft are both provided with a thread or a tooth-shaped connecting groove and the like to be connected with adjacent power shafts or output shafts, when relative displacement is generated between the bit feeding short section joint and the connecting joint part, in order not to influence torque transmission at two ends of the connecting shaft, a straight section of the connecting shaft body needs to meet the stroke of a thrust piston, and axial displacement in the axial torque transmission process needs to be met between the second end shaft part and the third end shaft part, so that the automatic bit feeding flexible drilling tool is prevented from being stuck to fail.

Preferably, the front end of a first shell of the joint short section is correspondingly inserted at the rear end of a second shell, a first gap for turning is formed between the front end of the first shell and the corresponding rear end of the second shell, and a sealing ring is arranged in the first gap; one end of the universal ball shaft is correspondingly positioned in the first shell, and the other end of the universal ball shaft is correspondingly positioned in the second shell.

Preferably, the drill string further comprises a rigid drill string, wherein the rigid drill string is hollow, the flexible section is arranged at the front end of the rigid drill string, and the rigid drill string is used for applying weight on bit to the flexible section.

Compared with the prior art, the utility model has the beneficial effects that:

1. this automatic send brill flexible drilling tool's send brill nipple joint is equipped with the annular chamber in sending brill nipple joint, be equipped with the spacer ring in the annular chamber, thereby keep apart out the low-pressure chamber in the annular chamber, be equipped with the first through-hole of intercommunication low-pressure chamber and annular space on sending brill nipple joint, at the drilling process, send brill nipple joint outside is low pressure liquid, and push rod portion inboard in the send brill nipple joint is high pressure liquid, consequently, can force the spacer ring to receive the thrust to low pressure chamber one side, play the effect that the propelling movement drilling tool gos forward, help drilling tool to solve the backing pressure problem.

2. Because the automatic drilling flexible drilling tool is provided with the multi-section joint pup joint and the multi-section drilling pup joint, each joint pup joint and each drilling pup joint are short and small, the integral trafficability of the automatic drilling flexible drilling tool is increased, the rigid section length of the integral drilling tool is greatly shortened, and the construction requirement of a small-curvature-radius well can be met. Meanwhile, a plurality of drilling feeding short sections which are connected in series can provide enough hydraulic propelling stroke, and the requirement of sliding guide drilling is met.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a cross-sectional view of one embodiment of an automated feed flexible drilling tool of the present invention.

FIG. 2 is a cross-sectional view of another embodiment of the automated feed flexible drilling tool of the present invention.

FIG. 3 is a cross-sectional view of another embodiment of the automated feed flexible drilling tool of the present invention.

FIG. 4 is a schematic view of the well bore of an embodiment of the automated feed flexible drilling tool of the present invention.

FIG. 5 is a partial cross-sectional view of one embodiment of the automated feed flexible drilling tool of the present invention.

Fig. 6 is a schematic connection diagram of a bit feeding sub and a joint sub in an embodiment of the automatic bit feeding flexible drilling tool of the present invention.

Fig. 7 is an enlarged view of a portion a of fig. 6.

Fig. 8 is a schematic connection diagram of a power sub and a joint sub in an embodiment of the automatic bit feeding flexible drilling tool of the present invention.

Fig. 9 is an enlarged view of a portion B of fig. 5.

In the drawings, each reference numeral means:

the device comprises a drill feeding short section 1, a connecting sleeve 11, a first connecting head 12-1, a second connecting head 12-2, a third connecting head 12-3, a fourth connecting head 12-4, a fifth connecting head 12-5, a sixth connecting head 12-6, a seventh connecting head 12-7, a spherical joint 12-7-1, a first ball socket 12-7-2 and a second ball socket 12-7-3;

the thrust piston 2, the push rod part 21, the connecting joint part 22, the third ball seat 22-1, the fourth ball seat 22-2 and the first sealing ring 23;

the annular cavity 3, the spacer ring 31, the second sealing ring 32, the low-pressure cavity 33, the first through hole 34, the high-pressure cavity 35 and the second through hole 36;

the bit feeding joint 4 and the connecting structure 41;

a rigid drill string 10, a second signal sub 101;

the guide power nipple 20, a third shell 201, a power shaft 202, a connecting groove 2021, a universal ball key 2022, a third flow through hole 2023, a third gap 203, a rotor 204, a stator 206 and a bearing 207;

the joint short section 30, a first outer shell 301, a second outer shell 302, a universal ball shaft 303, a ball head 3031, a first gap 304, a third sealing ring 3041, a fourth sealing ring 3042, a first inner step 3043, a second inner step 3044, a ball seat 305, a sealing sleeve 306 and a second gap 307;

bit sending pup joint 40, connecting shaft 401, second end shaft part 402, third end shaft part 403 and connecting groove 4031;

the guide mechanism or guide short section 5, the fourth outer shell 51, the output shaft 52, the first end shaft part 521, the connecting groove 522, the radial bearing group 53, the axial thrust bearing group 54 and the eccentric centralizing wing 55;

the drill 6, the first flow through hole 61;

the information transmission module 7, the tool face angle measurement module 71, the signal line 72 and the attitude measurement module 73;

a first signal nipple 8.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

an automatic drilling flexible drilling tool, please refer to fig. 1.

As shown in fig. 1, the bit sending short section comprises a bit sending short section 1, a hollow thrust piston 2 is arranged in the bit sending short section 1, the thrust piston 2 comprises a push rod part 21 and a connecting joint part 22, four first sealing rings 23 are arranged between the outer peripheral wall of the push rod part 21 and the inner wall of the bit sending short section 1, and the push rod part 21 can move axially inside the bit sending short section 1. A first sealing ring is arranged between the outer wall of the push rod part and the inner wall of the bit feeding short section; and a second sealing ring is arranged between the spacer ring and the inner wall of the bit feeding short section or the outer wall of the push rod part.

In this embodiment, be equipped with two annular chambers 3 between the outer wall of ejector part 21 and the inner wall of bit-sending nipple 1, be equipped with spacer ring 31 in each annular chamber 3, in this embodiment, spacer ring 31 threaded connection is at the outer wall of ejector part 21, be equipped with second sealing washer 32 between spacer ring 31 and the inner wall of bit-sending nipple 1, therefore, the inner wall of bit-sending nipple 1, the outer wall of ejector part 21 and spacer ring 31 can keep apart low-pressure chamber 33 in annular chamber 3, be equipped with intercommunication low-pressure chamber 33 and outside first through-hole 34 on the bit-sending nipple 1, it is unanimous with bit-sending nipple 1 outside hydraulic pressure in the low-pressure chamber 33 to make.

Of course, in other embodiments, the spacer ring may also be connected to the inner wall of the bit feeding sub in a threaded manner, and at this time, the second seal ring is disposed between the spacer ring and the outer wall of the push rod portion.

In this embodiment, the inner wall of the bit-feeding pup joint 1 on the right side in fig. 1, the outer wall of the push rod part 21 and the spacer ring 31 further isolate a high-pressure cavity 35 in the annular cavity 3, and the push rod part 21 is provided with a second through hole 36 for communicating the high-pressure cavity 35 with the push rod part 21, so that the high-pressure cavity 35 and the inner side of the push rod part 21 are hydraulically consistent.

In the drilling process, the outside of the bit feeding short section 1 is low-pressure liquid, and the inner side of the push rod part 21 is high-pressure liquid, so that the hydraulic pressure in the high-pressure cavity 35 is greater than the hydraulic pressure in the low-pressure cavity 33, the spacer ring 31 is forced to bear the right thrust (on one side of the low-pressure cavity), and the thrust piston 2 can apply the axial thrust to the right to play a role in pushing the drilling tool to advance.

In this embodiment, since the annular cavity 3 on the left side in fig. 1 is located at the end of the push rod portion 21, and the space in the annular cavity 3 on the left side of the spacer ring 31 on the left side is directly communicated with the inside of the push rod portion 21, the spacer ring 31 on the left side in fig. 1 is also subjected to a rightward thrust, which further promotes the thrust piston 2 to apply an axial thrust rightward.

The bit feeding short section 1 in the embodiment is a hollow cylindrical structure formed by connecting a plurality of short sleeves, and the bit feeding short section 1 is internally provided with a required structure by connecting the plurality of short sleeves, so that the parts of the bit feeding short section are conveniently assembled together.

Specifically, as shown in fig. 1, in this embodiment, the drill feeding short section 1 includes two sections of connection sleeves 11, two ends of the connection sleeves 11 are connected with hollow connectors, and specifically includes a first connector 12-1, a second connector 12-2 and a third connector 12-3, in this embodiment, the first connector 12-1 is connected between the two sections of connection sleeves 11, the second connector 12-2 and the third connector 12-3 are respectively connected to corresponding end portions of the two sections of connection sleeves 11, front and rear ports of the connection sleeves 11 are tapered threaded ports, corresponding end portions of the first connector 12-1, the second connector 12-2 and the third connector 12-3 are matched tapered threaded connectors, so that the two sections of connection sleeves 11, the first connector 12-1, the second connector 12-2 and the third connector 12-3 are correspondingly connected as the drill feeding short section 1, the annular cavity 33 is located between the inner wall of the connecting sleeve 11, the outer wall of the push rod part 21 and the end face of the corresponding connecting head.

As shown in fig. 1, the rear end of the bit feeding nipple 1 is provided with a hollow bit feeding joint 4, and when in use, the bit feeding nipple is connected in series in a drilling tool, wherein the third connector 12-3 and the bit feeding joint 4 respectively play a role in connection. The bit-sending connector 4 is provided with a connecting structure 41 for installing the connecting connector part 22, in this embodiment, the connecting connector part 22 is a conical head, the connecting structure 41 is a corresponding conical shape, the connecting connector part is directly arranged in the connecting structure 41, and when the push rod part 21 is forced to move along the axial direction in the bit-sending short section 1, the connecting connector part 22 can apply a rightward axial pushing force to the bit-sending connector 4.

In this embodiment, the bit feeding connector 4 and the second connector 12-2 are designed and combined separately, and are not integrally formed, the connection connector 22 is directly connected and fixed to the bit feeding connector 4 through a screw, and the bit feeding connector 4 and the second connector 12-2 are provided with mutually engaged recessed structures. During the process of lifting the drilling tool, the weight of the lower drilling tool is transmitted from the bit feeding joint 4 to the spacer ring 31 through the push rod part 21 and is suspended on the bit feeding short joint, and the force transmission is completed; in the lowering process, the bit pressure applied from the upper part is directly transmitted to the bit feeding joint 4 through the connector of the bit feeding short joint 1, and the drilling tool is pressed to move forwards.

When the pressure is supported, the bit pressure applied by the upper part cannot be completely transmitted to the piston, and at the moment, the joint of the bit feeding short joint 1 cannot be tightly attached to the bit feeding joint 4, so that the bit pressure transmission is influenced. Under the action of high-pressure drilling fluid, the thrust piston generates axial thrust to push the bit feeding joint to move forward to complete pressurization. In the pressurizing process, the axial displacement of the thrust piston is limited by the bit feeding short section joint and the spacing ring or the limiting ring together until the bit feeding short section joint is tightly attached to the shoulder of the bit feeding joint, and the bit pressure can be transferred.

Example 2:

an automatic drilling flexible drilling tool, please refer to fig. 2.

As shown in fig. 2, compared with embodiment 1, the bit feeding sub 1 of the bit feeding sub of this embodiment includes a joint sleeve 11 and two joints, the joints are a fourth joint 12-4 and a fifth joint 12-5, respectively, and the fourth joint 12-4 and the fifth joint 12-5 are connected to two ends of the joint sleeve 11 through a threaded structure.

In addition, compared with embodiment 1, in this embodiment, an annular cavity 3 is provided in the bit sending pup joint 1, and the thrust piston 2 in this embodiment is shorter, a spacer ring 31 is provided at the end of the push rod portion 21 of the thrust piston 2, the spacer ring 31 is located in the annular cavity 3, a second sealing ring 32 is provided between the spacer ring 31 and the inner wall of the connecting sleeve 11, an annular groove is provided on the outer wall of the spacer ring 31, the second sealing ring 32 is provided in the annular groove, a low-pressure cavity 33 is provided on the right side of the spacer ring 31 in the annular cavity 3, a first through hole 34 communicated to the low-pressure cavity 33 is provided on the connecting sleeve 11, and when high-pressure liquid is introduced into the bit sending pup joint 1, the spacer ring 31 is driven to move to the right, and drives the thrust piston 2 to move to the right.

Compared with the embodiment 1, the thrust piston 2 is subjected to smaller rightward thrust because the embodiment is only provided with the spacer ring 31, but the bit-sending short section is shorter in the embodiment and the turning radius of the drilling tool at the position of the bit-sending short section is smaller when the bit-sending short section is connected in series in the drilling tool.

Example 3:

an automatic drilling flexible drilling tool, please refer to fig. 3.

As shown in fig. 3, compared with embodiment 1, the bit-feeding pup joint 1 in this embodiment includes a connection sleeve 11, the left and right sides of the connection sleeve 11 are respectively connected with a connection head, which is a seventh connection head 12-7 and a sixth connection head 12-6, wherein the right end of the connection sleeve 11 is provided with a tapered threaded connection head, and the left side of the sixth connection head 12-6 is correspondingly provided with a tapered threaded port, so that the sixth connection head 12-6 is in threaded connection with the connection sleeve 11; the right end of the seventh connecting head 12-7 is provided with a universal transmission mechanism, so that the seventh connecting head 12-7 can deflect a certain angle relative to the connecting sleeve 11 along any direction, the universal transmission mechanism comprises a spherical joint 12-7-1 in threaded connection with the inside of the seventh connecting head 12-7, a first ball socket 12-7-2 and a second ball socket 12-7-3 which are arranged in a cylindrical port at the left end of the connecting sleeve 11, and the first ball socket 12-7-2 and the second ball socket 12-7-3 are in threaded connection with the cylindrical port at the left end of the connecting sleeve 11.

In this embodiment, the outer wall of the tail end of the push rod part 21 of the push piston 2 is provided with a spacer ring 31, and the spacer ring 37 is provided with a limit ring 37 at intervals, the spacer ring 31 and the limit ring 37 are connected to the outer wall of the push rod part 21 through a thread structure, the spacer ring 31 and the limit ring 37 are arranged in the annular cavity 3 in the bit-sending short section 1, and the connecting sleeve 11 is provided with a first through hole 34, so that the right side of the annular cavity 3 is isolated into a low-pressure cavity 33, and the limit ring 37 is located in the low-pressure cavity 33.

When the spacer ring 31 receives a rightward thrust, the thrust piston 2 moves rightward, and the limit ring 37 can block the step surface inside the sixth connecting head 12-6, so as to prevent the spacer ring 31 from moving to the right side of the first through hole 34 to cause pressure loss inside the bit-feeding nipple 1.

In this embodiment, the connection joint portion 22 at the right end of the thrust piston 2 is a ball head, the connection structure 41 in the bit-feeding joint 4 is a cylindrical cavity, the connection joint portion 22 is assembled in the connection structure 41 through a combined ball seat, the combined ball seat includes a third ball seat 22-1 and a fourth ball seat 22-2, the third ball seat 22-1 and the fourth ball seat 22-2 are connected in the connection structure 41 through a threaded structure, and therefore, the connection joint portion 22 can rotate with the bit-feeding joint 4 by a certain angle.

It can be seen that compared with embodiment 1, the bit-feeding short joint in this embodiment not only can apply axial thrust to the drilling tool, but also has a turning function, so that the turning radius of the drilling tool is smaller.

Example 4:

an automatic drilling flexible drilling tool, please refer to fig. 4 to 9.

As shown in fig. 4 and 5, the automatic feeding flexible drilling tool includes a rigid drill string 10, and a flexible section installed at a front end of the rigid drill string 10, the rigid drill string 10 is located in a main borehole M, the flexible section is located in a branch borehole N, the main borehole M is a vertical borehole, and the branch borehole N is a curved borehole. Wherein the rigid drill string 10 is used to apply weight-on-bit, where weight-on-bit refers to the forward drilling pressure of the autonomous drilling flexible drilling tool in the borehole, the flexible section being able to turn to drill a curved lateral.

The flexible section comprises a plurality of sections of guiding power short sections 20, a plurality of sections of joint short sections 30 and a plurality of sections of drilling short sections 40 in the embodiment 1, the drilling short sections 40 are connected in series at any position between the guiding power short sections 20, and the adjacent guiding power short sections 20 are connected with the drilling short sections 40 and the adjacent guiding power short sections 20 through the joint short sections 30. In this embodiment, the drill pipe nipples 40 are not adjacently disposed.

The guiding power nipple 20 is used for applying the power for rotating the automatic drilling flexible drilling tool, and each joint nipple 30 can realize turning within a certain angle range, so that the whole flexible section can turn, and the flexible section can be arranged in the branch well hole N.

Specifically, as shown in fig. 6 and 7, each joint sub 30 includes a first housing 301 and a second housing 302, a universal ball shaft 303 is disposed in the first housing 301 and the second housing 302, a rear end of the universal ball shaft 303 is correspondingly located in the first housing 301, a front end of the universal ball shaft 303 is correspondingly located in the second housing 302, and ball heads 3031 are disposed at front and rear ends of the universal ball shaft 303 and are used for connecting the power sub 20 on the front and rear sides.

The front end and the rear end of the first shell 301 are tapered interfaces, the front end of the second shell 302 is correspondingly provided with a tapered head, so that the end of the second shell 302 is inserted into the port of the first shell 301, a first gap 304 for turning is arranged between the rear end of the first shell 301 and the front end of the corresponding second shell 302, the first gap 304 is an annular space, a sealing ring is arranged in the first gap 304 and comprises a third sealing ring 3041 and a fourth sealing ring 3042, so that the first gap 304 is sealed, the leakage of a high-pressure liquid medium circulating inside is prevented, when drilling is also prevented, external hydraulic fluid enters the first shell 301 and the second shell 302, and meanwhile, the first shell 301 can turn at a certain angle relative to the second shell 302.

A ball seat 305 is provided inside the second housing 302, and the rear end of the second housing 302 has a spherical shape matching the ball seat 305, so that the second housing 302 can smoothly swing along the first housing 301. Due to the existence of the first gap 304, when the second casing 302 turns relative to the first casing 301, one side of the third sealing ring 3041 and one side of the fourth sealing ring 3042 can be compressed to deform, so that the first casing 301 and the second casing 302 can turn within a certain angle range, and as the flexible section has the plurality of joint short sections 30, each joint short section 30 can turn at a certain angle, so that the flexible section has a large turning amplitude as a whole.

A tool face angle measuring module 71 is arranged in the first signal nipple 8, and the tool face angle measuring module 71 transmits information to the information transmission module 7 through a signal line 72; and the guiding power nipple is provided with an attitude measuring module 73, and the attitude measuring module 73 transmits the attitude information of the near drill bit to the information transmission module 7 through a signal line 72. The information transmission module 7 is electrically connected with the mud pulser and can control the pulser to send signals to the ground.

As shown in fig. 8, each guided power sub 20 described in this embodiment includes a third housing 201, and the front and rear ends of the third housing 201 are connected to the corresponding first housing 301 and second housing 302 by a thread.

Furthermore, a power shaft 202 is arranged in each guide power nipple 20, two ends of the power shaft 202 are respectively provided with a connecting groove 2021, a ball 3031 at the end of the universal ball shaft is correspondingly arranged in the connecting groove 2021 through a universal ball key 2022, and the universal ball key 2022 is connected in the connecting groove 2021 through a pin shaft structure, a toothed insert or teeth and is used for transmitting torque between the ball 3031 and the connecting groove 2021.

Since the universal ball shaft 33 is inserted into the first housing 31 and the second housing 32, and both ends of the universal ball shaft are mounted in the connection grooves 221 of the adjacent power shafts 22 through the universal ball keys 222 by the ball heads 331, when the adjacent power shafts 22 deflect, the transmission of the drilling power is completed by the universal ball shaft 303.

As shown in fig. 9, the guiding mechanism or the guiding sub 5 in this embodiment includes a fourth housing 51, an output shaft 52 is disposed in the fourth housing 51, and the drill bit 6 is integrally disposed at the front end of the output shaft 52 or connected to the output shaft 52 through a thread.

The rear end of the fourth housing 51 is connected to the second housing 302 of the adjacent joint nipple in a threaded manner, the output shaft 52 includes a first end shaft portion 521 at the rear end, a connection groove 522 is arranged at the tail end of the first end shaft portion 521, and a ball head 3031 of a universal ball shaft adjacent to the output shaft 52 is correspondingly connected to the connection groove 522, so that connection between the guide mechanism or the guide nipple 5 and the flexible section is realized. It will be appreciated that the forward end of the rigid drill string 10 is threadedly connected to the rearward end of the first housing of the corresponding knuckle sub and will not be described in detail herein.

As shown in fig. 6, a connecting shaft 401 is arranged in the drill short section 40, two ends of the connecting shaft 401 are respectively provided with a second end shaft portion 402 and a third end shaft portion 403, the connecting shaft 401 is connected with the second end shaft portion 402 in a screw joint mode or a torque transmission groove, a key, a tooth embedding mode and the like, the second end shaft portion 402 is connected with the third end shaft portion 403 in a screw joint mode or a torque transmission groove, a key, a tooth embedding mode and the like, the other end of the third end shaft portion 403 is provided with a connecting groove 4031, a ball head 3031 in the corresponding joint short section is rotatably arranged in the connecting groove 4031, and the drill joints 4 and the third connectors 12-3 at two ends of the drill short section 40 are respectively screwed in ports of the first shell 301 of the joint short sections at two sides, so that the front end and the rear end of the drill short section 40 are respectively connected with the joint short sections at two sides. In this embodiment, at least one axial displacement is satisfied between the second end shaft portion 402 and the third end shaft portion 403 and the connecting shaft 401 under the condition of torque transmission.

During construction, flexible sections of the automatic feeding flexible drilling tool are connected and conveyed into a well through a rigid drill string 10, the rigid drill string 10 can transmit drilling pressure required by drilling for the flexible sections, and a power shaft 202 in each power short section 20, a universal ball shaft 303 in each joint short section 30, an output shaft 52 in a guide mechanism or guide short section 5, a connecting shaft 401 in each feeding short section 40, a second end shaft 402 and a third end shaft 403 of the automatic feeding flexible drilling tool are sequentially connected.

The drill bit 6 is arranged at the front end of the output shaft 52, and communicated flow channels are arranged in the rigid drill string 10, each guiding power short section 20, each joint short section 30, each bit feeding short section 40, the guiding mechanism or guiding short section 5 and the drill bit 6 and are used for providing a flow channel for a drilling circulating medium.

Because this automatic flexible drilling tool of sending a bit is equipped with multisection joint nipple joint 30 to be equipped with multisection power nipple joint 20, each section power nipple joint 20 can both provide independent moment of torsion, consequently, under the prerequisite that satisfies the drilling power demand, joint nipple joint 30 and power nipple joint 20 are short and small, have shortened the rigid section length of whole drilling tool greatly. In oil and gas development, the flexible drilling tool can be conveyed into a high-curvature branch well through the joint nipple 30, or the automatic drilling flexible drilling tool is conveyed to a high-curvature branch well section, so that branch well drilling operation is realized, and therefore a well with a small curvature radius, which is difficult to construct by a conventional power drilling tool, can be constructed.

In addition, because the automatic drilling flexible drilling tool is provided with the plurality of sections of drilling short sections 40, each drilling short section 40 can apply axial thrust to the drilling tool, and the phenomenon of pressure support can be well dealt with in the drilling process.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. An automatic flexible drilling tool that send bores which characterized in that: the device comprises a drill bit, a plurality of bit feeding short sections and a joint short section serial, wherein the joint short section serial comprises a plurality of joint short sections, and each joint short section comprises a joint structure for mutual connection in a deflection way; the bit feeding short section comprises a combined sleeve cylinder which can generate axial thrust under the action of hydraulic force to push the drill bit to advance; when the automatic bit-feeding flexible drilling tool comprises a plurality of bit-feeding short sections, the bit-feeding short sections are connected by adopting a joint structure; the bit feeding short section is connected with the joint short section through a joint structure; the drill bit is arranged at the lower end of the bit feeding short section or the joint short section; the automatic bit-feeding flexible drilling tool at least comprises a bit-feeding short joint arranged at the lower half section of the automatic bit-feeding flexible drilling tool; the distance between the joint structure deflection points on the two sides of the bit feeding short section is 1-5 times of the diameter of the drill bit, and the distance between the joint structure deflection point in the joint short section and the adjacent joint structure deflection point is 0.5-4 times of the diameter of the drill bit.

2. The automated feed flexible drilling tool of claim 1, wherein: a thrust piston is arranged in the bit feeding short section, and comprises a push rod part and a connecting joint part; at least one annular cavity is arranged between the push rod part and the inner wall of the bit-feeding short section, a spacing ring is arranged in the annular cavity and connected to the inner wall of the bit-feeding short section or the outer wall of the push rod part, the inner wall of the bit-feeding short section, the outer wall of the push rod part and the spacing ring separate a low-pressure cavity and a high-pressure cavity in the annular cavity, and a first through hole for communicating the low-pressure cavity and the annular cavity is formed in the bit-feeding short section;

the rear end of the bit feeding short section is provided with a hollow bit feeding joint, a connecting structure used for installing a connecting joint part is arranged in the bit feeding joint, the connecting joint part is assembled in the connecting structure, when the push rod part moves in the bit feeding short section along the axial direction, and the connecting joint part can apply thrust to the bit feeding joint.

3. The automated feed flexible drilling tool of claim 1 or 2, wherein: the automatic bit-feeding flexible drilling tool comprises a plurality of bit-feeding short sections.

4. The automated feed flexible drilling tool of claim 2, wherein: the bit feeding joint and the bit feeding short section can be integrally formed to form a shell, the shell is divided into two parts which can move relatively but are not detachable through a closed continuous curve gap, and the axial displacement of the thrust piston is limited through the gap;

or the bit feeding joint and the bit feeding short section are respectively designed and combined, the connecting joint part can be directly connected and fixed with the bit feeding joint through threads, and the axial displacement of the thrust piston is limited by the bit feeding short section joint and the spacing ring or the limiting ring.

5. The automated feed flexible drilling tool of claim 2, wherein: the inner wall of the bit feeding short section, the outer wall of the push rod part and the spacer ring are arranged in the annular cavity to further isolate a high-pressure cavity, and the push rod part is provided with a second through hole which is communicated with the high-pressure cavity and the push rod part.

6. The automated feed flexible drilling tool of claim 2, wherein: the bit feeding short section comprises at least one connecting sleeve, the front end or/and the rear end of the connecting sleeve is/are connected with a hollow connector, and the annular cavity is located between the inner wall of the connecting sleeve, the outer wall of the push rod part and the corresponding end face of the connector.

7. The automated feed flexible drilling tool of claim 2, wherein: the drilling device also comprises a guiding power nipple and/or a drill bit which are arranged at the front end of the joint nipple serial string, wherein the drilling feeding nipple is connected in series at any position in the joint nipple serial string and can be matched with the guiding power nipple to complete guiding drilling;

each joint short section comprises a first shell and a second shell which are connected in a front-back mode, and the first shell can turn a certain angle relative to the second shell;

and communicated flow passages are arranged in each joint short section, the drill feeding short section, the guiding power short section and the drill bit.

8. The automated feed flexible drilling tool of claim 7, wherein:

the connecting shaft inside the bit feeding short section is of a hollow cylinder structure, a second end shaft part and a third end shaft part of the connecting shaft are both provided with threads or tooth-shaped connecting grooves, when relative displacement is generated between a bit feeding short section joint and a connecting joint part, torque transmission at two ends of the connecting shaft is not influenced, a straight section of the connecting shaft body must meet the stroke of a thrust piston, axial displacement in the axial torque transmission process is also met between the second end shaft part and the third end shaft part, and the bit feeding short section is prevented from being blocked and made to fail.

9. The automated feed flexible drilling tool of claim 8, wherein: the front end of a first shell of the joint short section is correspondingly inserted at the rear end of a second shell, a first gap for turning is formed between the front end of the first shell and the corresponding rear end of the second shell, and a sealing ring is arranged in the first gap; the first shell and the second shell are internally provided with universal ball shafts, one end of each universal ball shaft is correspondingly positioned in the first shell, and the other end of each universal ball shaft is correspondingly positioned in the second shell.

10. The automated feed flexible drilling tool of claim 1, wherein: the drill string is hollow, a flexible section is mounted at the front end of the rigid drill string, and the rigid drill string is used for applying weight on the flexible section.

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