CN212837577U

CN212837577U - Screw drill with unfreezing function

Info

Publication number: CN212837577U
Application number: CN202021017636.4U
Authority: CN
Inventors: 关勤勤; 龙静; 肖平; 王淇
Original assignee: Sinopec Oilfield Equipment Corp; Sinopec Jiangzuan Petroleum Machinery Co Ltd
Current assignee: Sinopec Oilfield Equipment Corp; Sinopec Jiangzuan Petroleum Machinery Co Ltd
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2021-03-30
Anticipated expiration: 2030-06-05

Abstract

The application relates to a screw rod drilling tool with unfreezing function belongs to screw rod drilling tool technical field, includes: the drilling tool comprises a drilling tool body, a drilling tool body and a drilling tool body, wherein the drilling tool body comprises a shell and a shaft lever, the shell is of a hollow tubular structure, and the shaft lever is positioned in the shell and can rotate in the shell; be equipped with the accommodation space who is used for holding the card thing between casing and the axostylus axostyle, when the drilling tool body is in the unfreezing state, the accommodation space intussuseption is filled with and is used for transmitting the moment of torsion of casing to the card thing of axostylus axostyle. The utility model provides a screw rod drilling tool does not drop into the card thing in accommodation space when normal work, drops into the card thing in the ground to the drilling rod when needing to unfreeze, and the card thing whereabouts gets into this internal, and the card thing is in this internal card axostylus axostyle and casing of drilling tool to make the axostylus axostyle follow the synchronous rotation of casing. The screw drilling tool with the unfreezing function is compact in structure, small in weakening of structural strength of the shaft rod, small in stress of the shaft rod and long in service life. And the strength required by the rotor screw, the universal shaft and the transmission shaft when the screw drill works normally is not influenced.

Description

Screw drill with unfreezing function

Technical Field

The application relates to the technical field of screw drilling tools, in particular to a screw drilling tool with a stuck releasing function.

Background

In oil and gas exploitation, downhole power drilling tools are increasingly widely used, the power drilling tools drive drill bits to achieve stratum drilling, the downhole power drilling tools are driven by drilling fluid pumped in through ground equipment, during operation, the drilling fluid is pumped into the downhole power drilling tools, and the power drilling tools convert hydraulic energy into kinetic energy to drive well bottom drill bits to rotate. There are two common types of power drills: screw drills and turbine drills. For a screw drilling tool, drilling fluid enters a stator shell to drive a rotor screw eccentric to the stator shell to rotate, and the rotor screw drives a universal shaft and a transmission shaft connected with the rotor screw to rotate, so that a drill bit at the lower end of the drilling tool is driven to rotate. The turbine drilling tool adopts one-stage or multi-stage turbine sections to provide torque for a drill bit at the lower end of the drilling tool, each stage is composed of a stator which does not move and a rotor which rotates, the rotor is connected with a shaft, drilling fluid is guided into the rotor by the stator, and rotor blades rotate under the action of the drilling fluid to provide torque for the drill bit at the lower end of the drilling tool.

During the drilling process, the drill bit may be blocked during the rock cutting process, and when the drill bit is in abnormal conditions such as severe stick-slip and well wall collapse, the drill bit is blocked. After the drill is stuck, the torque of the ground turntable is increased, the ground turntable drives the drill rod to rotate, and the drill bit is stuck off when the torque is large enough. However, this method is not suitable for use in a drilling assembly having a motor downhole because the conventional motor structure is not capable of transmitting stator housing torque to the drill bit.

Under the condition that a power drilling tool is arranged at the bottom of a well, common methods for releasing the stuck state include methods such as drawing, shocking, acid soaking and the like, for example, a certain tensile force is generated on the stuck part by lifting a drill rod to force a drill bit to pass through the stuck part, a certain impact force is generated by a jar, after rock is vibrated and loosened, the drill bit is lifted to pass through the stuck part, and then the releasing of the stuck state is realized. However, the above-mentioned unfreezing method has poor reliability, and once the unfreezing fails, the only option is to break out the safe joint, leave the drill bit, the power drill and the MWD at the bottom of the well, and then salvage the drill bit, the power drill and the MWD. When fishing fails, well filling and sidetracking are required. When this occurs, fishing, filling and window sidetracking add to the cost of expensive drilling operations, in addition to the loss of tools due to part of the drill assembly remaining downhole.

Disclosure of Invention

The embodiment of the application provides a screw drilling tool with a stuck releasing function, and aims to solve the problems that in the related art, a power drilling tool is poor in stuck releasing reliability and high in drilling operation cost.

The embodiment of the application provides a screw rod drilling tool with unfreezing function, includes:

the drilling tool comprises a drilling tool body and a drilling tool body, wherein the drilling tool body comprises a shell and a shaft rod, the shell is of a hollow tubular structure, and the shaft rod is positioned in the shell and can rotate in the shell;

an accommodating space for accommodating a clamping object is arranged between the shell and the shaft rod, and when the drilling tool body is in an unlocking state, the accommodating space is filled with the clamping object for transmitting the torque of the shell to the shaft rod.

In some embodiments, the stop is a steel ball.

In some embodiments, the accommodating space includes:

the stop groove is positioned on the inner wall of the shell and extends along the axial direction of the shell;

and the stop surface is positioned on the side wall of the shaft rod and matched with the stop groove, and the stop groove and the stop surface form the accommodating space.

In some embodiments, the plurality of stop grooves are uniformly distributed along the circumferential direction of the housing, the plurality of stop surfaces are uniformly distributed along the circumferential direction of the side wall of the shaft rod, and the plurality of stop grooves and the plurality of stop surfaces form the plurality of accommodating spaces.

In some embodiments, the diameter of the stop is greater than the minimum clearance between the stop slot and the stop face, and the diameter of the stop is less than the maximum clearance between the stop slot and the stop face.

In some embodiments, the housing comprises an anti-drop housing, a stator housing, a cardan shaft housing and a transmission shaft housing which are sequentially in threaded connection;

the shaft lever comprises an anti-falling lever, a rotor screw, a universal shaft and a transmission shaft which are sequentially in threaded connection;

the clamping object and the accommodating space are arranged between the anti-falling rod and the anti-falling shell, between the universal shaft and the universal shaft shell or in a gap between the transmission shaft and the transmission shaft shell.

In some embodiments, the top end of the anti-drop rod is in threaded connection with an anti-drop nut, an anti-drop gasket is arranged between the anti-drop nut and the anti-drop rod, a stop hole with a diameter smaller than the inner diameter of the anti-drop shell is arranged in the anti-drop shell, and the diameter of the anti-drop nut is larger than the inner diameter of the stop hole; meanwhile, the diameter of the clamping object is smaller than the maximum gap between the anti-falling nut and the inner wall of the anti-falling shell.

In some embodiments, the stop groove is opened on the inner wall of the anti-drop shell, the stop surface is positioned on the side wall of the anti-drop rod, and the stop is positioned between the stop groove and the stop surface;

and a shaft shoulder for limiting the falling of the clamping object is arranged on the side wall of the anti-falling rod, and the shaft shoulder is positioned at the bottom of the blocking surface.

In some embodiments, the stop slot is an arcuate slot having a diameter greater than a diameter of the stop.

In some embodiments, the top of the anti-falling shell is provided with a first threaded hole for connecting a drill rod, and the bottom of the transmission shaft is provided with a second threaded hole for connecting a drill bit.

The beneficial effect that technical scheme that this application provided brought includes:

the embodiment of the application provides a screw rod drilling tool with unblock function, because the screw rod drilling tool of this application has set up drilling tool body and has separated unblock mechanism. The drilling tool body comprises a shell and a shaft rod, wherein the shell is of a hollow tubular structure, and the shaft rod is positioned in the shell and can rotate in the shell; an accommodating space for accommodating a clamping object is arranged between the shell and the shaft rod, and when the drilling tool body is in the unlocking state, the accommodating space is filled with the clamping object for transmitting the torque of the shell to the shaft rod. When the drill bit card bored, put into the card thing in subaerial follow drilling rod, the card thing falls drilling tool this body down under the effect of dead weight in, and block axostylus axostyle and casing in the drilling tool body to make the axostylus axostyle follow the synchronous rotation of casing, subaerial carousel transmits the moment of torsion for the casing, and the casing passes through the card thing and transmits the moment of torsion for the axostylus axostyle, realizes the downhole unfreezing of drill bit.

Therefore, the screw drilling tool of this application does not drop into the card thing in the screw drilling tool when normal work, drops into the card thing in the drilling rod from ground when needing to unfreeze, and the card thing whereabouts gets into this internal, and the card thing blocks axostylus axostyle and casing in this internal drilling tool to make the axostylus axostyle follow the synchronous rotation of casing. The screw drilling tool with the unfreezing function is compact in structure, small in weakening of structural strength of the shaft rod, small in stress of the shaft rod and long in service life. And the strength required by the rotor screw, the universal shaft and the transmission shaft when the screw drill works normally is not influenced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of the present application;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A in an unlatched condition;

FIG. 3 is a cross-sectional view taken along A-A of FIG. 2;

FIG. 4 is an enlarged view of a portion of FIG. 1 at A in an unlatched condition;

fig. 5 is a sectional view taken along the direction B-B in fig. 4.

Reference numerals:

10. a drilling tool body; 10a, a shell; 10b, a shaft lever; 11. the shell is prevented from falling; 12. the anti-dropping rod; 13. a stator housing; 14. a rotor screw; 15. a cardan shaft housing; 16. a cardan shaft; 17. a drive shaft housing; 18. a drive shaft; 19. a first threaded hole; 20. a second threaded hole; 21. the anti-drop nut; 22. a drop-proof gasket;

30. an accommodating space; 31. a stop groove; 32. a stop surface; 33. a stopper; 34. and a shaft shoulder.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application.

The embodiment of the application provides a screw drilling tool with a stuck releasing function, which can solve the problems of poor stuck releasing reliability and high drilling operation cost of a power drilling tool.

Referring to fig. 1 to 5, an embodiment of the present application provides a screw drill with an unlocking function, including:

the drilling tool comprises a drilling tool body 10, wherein the drilling tool body 10 comprises a shell 10a and a shaft 10b, the shell 10a is a hollow tubular structure, and the shaft 10b is positioned in the shell 10a and can rotate in the shell 10 a; during normal drilling construction, drilling fluid enters the housing 10a to drive the shaft 10b to rotate in the housing 10a, and the shaft 10b drives the drill bit connected with the shaft to rotate and drill.

The housing 10a includes a drop-proof housing 11, a stator housing 13, a cardan shaft housing 15, and a transmission shaft housing 17, and the shaft 10b includes a drop-proof shaft 12, a rotor screw 14, a cardan shaft 16, and a transmission shaft 18. The anti-drop shell 11, the stator shell 13, the universal shaft shell 15 and the transmission shaft shell 17 are fixedly connected in sequence through threads, and the anti-drop rod 12, the rotor screw 14, the universal shaft 16 and the transmission shaft 18 are fixedly connected in sequence through threads.

The drop prevention bar 12 is located within the drop prevention housing 11, and the drop prevention bar 12 is used to prevent the rotor screw 14, the cardan shaft 16 and the transmission shaft 18 from dropping into the well. The top end of the drop-proof rod 12 is connected with a drop-proof nut 21 through a thread, and a drop-proof gasket 22 is arranged between the drop-proof nut 21 and the drop-proof rod 12. A stop hole with a diameter smaller than the inner diameter of the anti-drop shell 11 is arranged in the anti-drop shell 11, the diameter of the anti-drop nut 21 is larger than the inner diameter of the stop hole, and the stop hole provides axial limiting for the anti-drop nut 21.

The rotor screw 14 is positioned in the stator housing 13, drilling fluid enters the stator housing 13 to drive the rotor screw 14 to eccentrically rotate in the stator housing 13, a certain pressure difference is formed between the inlet and the outlet of the drilling fluid in the stator housing 13 to push the rotor screw 14 to rotate around the axis of the stator housing 13, the rotating speed and the torque are transmitted to a drill bit through the universal shaft 16 and the transmission shaft 18, and the rotor screw 14 drives the universal shaft 16 and the transmission shaft 18 to synchronously rotate, so that the drilling operation is realized.

A cardan shaft 16 is located within the cardan shaft housing 15, the cardan shaft 16 converting the eccentric rotational movement of the rotor screw 14 into a coaxial rotational movement of the transmission shaft 18. The transmission shaft 18 is positioned in the transmission shaft shell 17, and the transmission shaft 18 is used for connecting the drill bit and driving the drill bit to rotate.

A first threaded hole 19 for connecting a drill rod (not shown) is formed at the top of the drop-proof housing 11, and a second threaded hole 20 for connecting a drill bit (not shown) is formed at the bottom of the drive shaft 18.

An accommodating space 30 for accommodating a stopper 33 is provided between the housing 10a and the spindle 10b, and the stopper 33 for transmitting the torque of the housing 10a to the spindle 10b is filled in the accommodating space 30 when the drill body 10 is in the unlocked state. The stop 33 is located in the receiving space 30 to limit the relative rotation of the housing 10a and the shaft 10 b. The receiving space 30 provides a location for the stop 33 to limit the stop 33 from following the rotation of the housing 10a about the axis of the shaft 10 b.

For convenience of description of the embodiment of the present application, the present embodiment will be described in detail by taking an example in which the stopper 33 in the accommodating space 30 is provided between the drop-preventing housing 11 and the drop-preventing lever 12. Of course, the person skilled in the art can also arrange the stop 33 in the receiving space 30 between the stator housing 13 and the rotor screw 14; the stopper 33 in the accommodation space 30 is provided between the transmission shaft housing 17 and the transmission shaft 18; or the stopper 33 in the housing space 30 is provided between the universal shaft housing 15 and the universal shaft 16.

A stopper 33 in the accommodating space 30 is provided between the drop-preventing housing 11 and the drop-preventing lever 12, and the stopper 33 is used to connect the drop-preventing housing 11 and the drop-preventing lever 12 when thrown into the drop-preventing housing 11. When the drill bit is stuck, the stopper 33 is put into the drill rod from the ground, and the stopper 33 falls into the drop-preventing housing 11. The stopper 33 catches the drop-preventing lever 12 in the drop-preventing housing 11 so that the drop-preventing lever 12 follows the synchronous rotational movement of the drop-preventing housing 11. The stop 33 transmits the torque of the drop-proof housing 11 to the drop-proof rod 12 and the drill bit, thereby realizing reliable and quick release of the drill bit.

The tool body 10 is not inserted and filled with the stoppers 33 in the accommodation space 30 during normal drilling operation, the drop prevention lever 12 and the drop prevention housing 11 are relatively independent from each other, and the drop prevention lever 12 and the drop prevention housing 11 cannot be connected to each other to rotate together. When the bit jam needs to be released, the stopper 33 is put into the drill rod from the ground, the stopper 33 falls into the accommodating space 30 between the drop-proof housing 11 and the drop-proof rod 12, and the stopper 33 connects the drop-proof housing 11 and the drop-proof rod 12 into a whole to rotate synchronously. The top of the anti-drop shell 11 is connected with a drill rod, so that the torque of the wellhead rotary table can be transmitted to the shell 10a through the drill rod, then the shell 10a transmits the torque to the anti-drop rod 12, the rotor screw 14, the universal shaft 16, the transmission shaft 18 and the drill bit through the clamping stopper 33, the torque of the drill bit is increased, and the unlocking of the drill bit is realized.

In some alternative embodiments, referring to fig. 2 and 3, the application embodiment provides a screw drill with a stuck-releasing function, and the accommodating space 30 of the screw drill comprises: a stop slot 31 located on the inner wall of the anti-drop housing 11, the stop slot 31 extending along the axial direction of the anti-drop housing 11, a stop surface 32 located on the side wall of the anti-drop rod 12 and matching with the stop slot 31, the stop slot 31 and the stop surface 32 forming an accommodating space 30. The stop groove 31 is an arc-shaped groove having a diameter larger than that of the stopper 33, the stop surface 32 is a flat surface, and the stopper 33 is located in the accommodating space 30 formed by the stop groove 31 and the stop surface 32.

Of course, the accommodating space 30 is not limited to the accommodating space 30 formed by the stopper groove 31 and the stopper surface 32, and the accommodating space 30 may be formed by the stopper groove 31 provided on the inner wall of the drop-preventing housing 11 and the key groove provided on the side wall of the drop-preventing lever 12. The stopper 33 is not limited to a regular steel ball, and the stopper 33 may be a rigid structure such as a cylinder or an ellipsoid.

In some alternative embodiments, referring to fig. 2 and 3, the application embodiment provides a progressive cavity drill with a trip release function, the stop grooves 31 of the progressive cavity drill are uniformly distributed in a plurality along the circumferential direction of the anti-drop shell 11, the stop surfaces 32 are uniformly distributed in a plurality along the circumferential direction of the side walls of the anti-drop rod 12, and the plurality of stop grooves 31 and the plurality of stop surfaces 32 form a plurality of accommodating spaces 30. The accommodation space 30 is provided in as many as possible, so that the accommodation space 30 can accommodate more stoppers 33, so that the drop prevention lever 12 of the tool body 10 cannot rotate relative to the drop prevention housing 11 and can transmit a larger torque.

In some alternative embodiments, as described with reference to fig. 4 and 5, the application embodiment provides a progressive cavity drill with an unlocking function, the diameter of the stop 33 of the progressive cavity drill is larger than the minimum clearance s between the stop groove 31 and the stop surface 32, and the diameter of the stop 33 is smaller than the maximum clearance between the stop groove 31 and the stop surface 32. The diameter of the stopper 33 is smaller than the maximum clearance h between the drop-prevention nut 21 and the inner wall of the drop-prevention housing 11. It is ensured that the stop 33 can enter the accommodating space 30 formed by the stop groove 31 and the stop face 32 during the falling, while the stop 33 is restricted from rotating about the axis of the drop prevention lever 12 following the drop prevention housing 11.

A shoulder 34 for restricting the falling of the stopper 33 is provided on the side wall of the drop prevention lever 12, and the shoulder 34 is located at the bottom of the stopper surface 32. The clearance between the shoulder 34 and the inner wall of the drop-proof housing 11 is smaller than the diameter of the stopper 33, and the stopper 33 is stopped from dropping by the shoulder 34 when dropping onto the shoulder 34.

Principle of operation

The embodiment of the application provides a screw drill with a stuck releasing function, and the screw drill is provided with a drill body 10 and an accommodating space 30 for accommodating a stuck object 33 between a shell 10a and a shaft rod 10 b. The drill body 10 includes a housing 10a and a shaft 10b, the housing 10a is a hollow tubular structure, and the shaft 10b is located in the housing 10a and can rotate in the housing 10 a. An accommodating space 30 for accommodating a stopper 33 is provided between the housing 10a and the spindle 10b, and the stopper 33 for transmitting the torque of the housing 10a to the spindle 10b is filled in the accommodating space 30 when the drill body 10 is in the unlocked state. The stop 33 is located in the receiving space 30 to limit the relative rotation of the housing 10a and the shaft 10 b. The receiving space 30 provides a location for the stop 33 to limit the stop 33 from following the rotation of the housing 10a about the axis of the shaft 10 b.

When the drill bit is stuck, the clamping object 33 is put into the drill rod on the ground, the clamping object 33 falls into the drill body 10 under the action of self weight, the shaft rod 10b and the shell 10a are clamped in the drill body 10, the drill body 10 is in the unlocking state, the shaft rod 10b rotates synchronously along with the shell 10a, the rotary table on the ground transmits the torque to the shell 10a, and the shell 10a transmits the torque to the shaft rod 10b through the clamping object 33, so that the downhole unlocking of the drill bit is realized.

The screw drill of this application does not drop into and fill the card 33 in accommodation space 30 when normal operating, drops into the card 33 from ground to the drilling rod when needing to unfreeze, and the card 33 falls into the drilling tool body 10 in, and the card 33 blocks axostylus axostyle 10b and casing 10a in the drilling tool body 10, makes the screw drill be in the state of unfreezing to make axostylus axostyle 10b follow casing 10a synchronous rotation. The screw drilling tool with the unfreezing function is compact in structure, small in weakening of the structural strength of the shaft rod 10b, small in stress of the shaft rod and long in service life. And does not affect the strength required by the rotor screw 14, the cardan shaft 16 and the transmission shaft 18 during the normal operation of the screw drill.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in the present application, relational terms such as "first" and "second", and the like, are 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. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A screw drill with a stuck releasing function is characterized by comprising:

the drilling tool comprises a drilling tool body (10), wherein the drilling tool body (10) comprises a shell (10a) and a shaft rod (10b), the shell (10a) is of a hollow tubular structure, and the shaft rod (10b) is located in the shell (10a) and can rotate in the shell (10 a);

an accommodating space (30) for accommodating a clamping object (33) is arranged between the shell (10a) and the shaft lever (10b), and when the drilling tool body (10) is in an unlocked state, the accommodating space (30) is filled with the clamping object (33) for transmitting the torque of the shell (10a) to the shaft lever (10 b).

2. The screw drill with the stuck releasing function according to claim 1, wherein:

the clamping object (33) is a steel ball.

3. A progressive cavity drill with a stuck freeing function according to claim 1, wherein said housing space (30) comprises:

a stop groove (31) located on the inner wall of the housing (10a), wherein the stop groove (31) extends along the axial direction of the housing (10 a);

and the stop surface (32) is positioned on the side wall of the shaft rod (10b) and matched with the stop groove (31), and the stop groove (31) and the stop surface (32) form the accommodating space (30).

4. The progressive cavity drill with the stuck freeing function as set forth in claim 3, wherein:

the plurality of the stop grooves (31) are uniformly distributed along the circumferential direction of the shell (10a), the plurality of the stop surfaces (32) are uniformly distributed along the circumferential direction of the side wall of the shaft rod (10b), and the plurality of the stop grooves (31) and the plurality of the stop surfaces (32) form the plurality of accommodating spaces (30).

5. The progressive cavity drill with the stuck releasing function according to claim 3 or 4, wherein:

the diameter of the stop (33) is larger than the minimum clearance between the stop groove (31) and the stop surface (32), and the diameter of the stop (33) is smaller than the maximum clearance between the stop groove (31) and the stop surface (32).

6. The progressive cavity drill with the stuck freeing function as set forth in claim 3, wherein:

the shell (10a) comprises an anti-drop shell (11), a stator shell (13), a universal shaft shell (15) and a transmission shaft shell (17) which are sequentially connected in a threaded manner;

the shaft lever (10b) comprises an anti-falling lever (12), a rotor screw (14), a universal shaft (16) and a transmission shaft (18) which are sequentially connected in a threaded manner;

the clamping object (33) and the containing space (30) are arranged in a gap between the anti-falling rod (12) and the anti-falling shell (11), between the universal shaft (16) and the universal shaft shell (15) or between the transmission shaft (18) and the transmission shaft shell (17).

7. The progressive cavity drill with the stuck freeing function according to claim 6, wherein:

the top end of the anti-falling rod (12) is in threaded connection with an anti-falling nut (21), an anti-falling gasket (22) is arranged between the anti-falling nut (21) and the anti-falling rod (12), a blocking hole with the diameter smaller than the inner diameter of the anti-falling shell (11) is arranged in the anti-falling shell (11), and the diameter of the anti-falling nut (21) is larger than the inner diameter of the blocking hole; at the same time, the user can select the desired position,

the diameter of the stop (33) is smaller than the maximum gap between the anti-drop nut (21) and the inner wall of the anti-drop shell (11).

8. The progressive cavity drill with the stuck freeing function according to claim 6, wherein:

the stop groove (31) is formed in the inner wall of the anti-falling shell (11), the stop surface (32) is located on the side wall of the anti-falling rod (12), and the clamping object (33) is located between the stop groove (31) and the stop surface (32);

and a shaft shoulder (34) for limiting the falling of the clamping object (33) is arranged on the side wall of the anti-falling rod (12), and the shaft shoulder (34) is positioned at the bottom of the stopping surface (32).

9. The progressive cavity drill with the stuck freeing function according to claim 6, wherein:

the stop groove (31) is an arc-shaped groove with the diameter larger than that of the clamping object (33).

10. The progressive cavity drill with the stuck freeing function according to claim 6, wherein:

the top of the anti-falling shell (11) is provided with a first threaded hole (19) for connecting a drill rod, and the bottom of the transmission shaft (18) is provided with a second threaded hole (20) for connecting a drill bit.