Liner Drilling Running Tool

Abstract

The present invention discloses a tail pipe drilling delivery tool, which relates to the technical field of oil and gas production, including: a fixed support, an outer surrounding pipe, a tail pipe hanger, a tail pipe, and a drilling mechanism; the outer surrounding pipe is connected to the bottom of the fixed support, the fixed support is equipped with a tail pipe hanger, the lower end of the tail pipe hanger is equipped with a surrounding pipe, the middle of the tail pipe hanger is penetrated with a drilling mechanism, the tail pipe hanger includes: a pipe body, a slip, a connecting rod, a sliding sleeve, and an insert tube, a through hole is opened on the side wall of the pipe body, the slip is sleeved at the lower part of the pipe body, the insert tube is sleeved at the upper part of the pipe body, the sliding sleeve is sleeved at the outside of the insert tube and the pipe body, an annular space is formed between the sliding sleeve, the insert tube and the pipe body, the annular space is connected with the through hole, the sliding sleeve can slide along the insert tube and the pipe body, and the sliding sleeve is connected with the slip through the connecting rod. The present application can reduce the possibility of the delivery tool, the tail pipe and the surrounding pipe being separated, thereby shortening the abnormal production time.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas exploitation, and in particular to a tail pipe drilling delivery tool. Background Art

[0002] Tail pipe drilling refers to the process of drilling to a certain depth using conventional drilling technology, connecting the drill pipe column to the liner drilling system, and continuing drilling through the liner drilling system. In the liner drilling process, the liner is part of the drill string, and drilling and lowering the liner are completed in the same operation. Although the liner drilling technology is similar to the casing drilling technology, the difference between the two is that the drill string in the casing drilling is composed of casing from the bottom of the well to the wellhead, while the drill string in the liner drilling is composed of drill pipe and liner.

[0003] The current liner drilling technology faces the problem that the running tool and the liner may be separated from the surrounding pipe during the drilling process. Once the above problem occurs, the running tool and the liner will fall into the well, so the corresponding operation to deal with the leaking well will prolong the abnormal production time. At the same time, the release of the running tool in the existing technology generally adopts the ball-throwing hydraulic method, but this method is useless for underbalanced drilling such as air drilling and foam drilling. Summary of the invention

[0004] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a liner drilling running tool, which can reduce the possibility of separation of the running tool, the liner and the surrounding pipe, thereby shortening the abnormal production time.

[0005] The specific technical solution of the embodiment of the present invention is:

[0006] A liner drilling delivery tool comprises: a fixed support, an outer surrounding pipe, a liner hanger, a liner, and a drilling mechanism; the outer surrounding pipe is connected to the lower part of the fixed support, the liner hanger is installed on the fixed support, the lower end of the liner hanger is installed with the surrounding pipe, the middle part of the liner hanger is penetrated with a drilling mechanism, the liner hanger comprises: a pipe body, a slip, a connecting rod, a sliding sleeve, and an insert sleeve, a through hole is opened on the side wall of the pipe body, the slip sleeve is sleeved on the lower part of the pipe body, and the insert sleeve is sleeved on the The upper part of the tube body, the sliding sleeve is arranged on the outside of the insert tube and the tube body, an annular space is formed among the sliding sleeve, the insert tube and the tube body, the annular space is communicated with the through hole, the sliding sleeve can slide along the insert tube and the tube body, the sliding sleeve is connected to the slip through the connecting rod, the side wall of the tube body has a guide part whose diameter gradually increases from top to bottom, the slip is located above the guide part, and when the slip moves downward, the slip expands radially under the action of the guide part.

[0007] Preferably, the outer side wall of the slip has a friction portion.

[0008] Preferably, a step portion is provided on the side wall of the tube body, and the step portion is located between the sliding sleeve and the slip, and the step portion can limit the sliding sleeve.

[0009] Preferably, the insert is fixedly connected to the tube body via a positioning screw, and a shear pin is provided between the insert and the sliding sleeve.

[0010] Preferably, the drilling mechanism comprises: a drill pipe; a thruster connected below the drill pipe, the thruster being capable of being retracted and extended to provide drilling pressure; a drill collar connected below the thruster; a motor connected below the drill collar, the motor being capable of rotating under the pressure of the drilling fluid; and a drill bit transmission-connected to the motor.

[0011] Preferably, a return short section is connected below the tail pipe, a rotating short section is connected below the return short section, the motor is located in the return short section, a locking pin is provided between the motor housing and the return short section, a motor torque output lock is connected between the rotating short section and the shaft of the motor, and the motor torque output lock is located in the rotating short section.

[0012] Preferably, the tie-back short section is connected to the rotating short section via a bearing.

[0013] Preferably, the drill rod comprises: a drill rod body, a drill rod female joint, and a drill rod male joint, the end of the drill rod body is provided with a drill rod external thread, the drill rod body, the drill rod female joint, and the drill rod male joint are connected in sequence, wherein the drill rod external thread matches the drill rod female joint internal thread, the drill rod female joint internal thread matches the drill rod male joint external thread, and the lower end of the drill rod male joint is provided with a drill rod male joint internal thread.

[0014] Preferably, the drill collar includes: an upper flange, an upper transition body, a center tube, an outer tube, a lower transition body, and a lower flange. The upper end of the upper transition body is connected to the upper flange, and the lower end of the upper transition body is connected to the upper end of the center tube and the upper end of the outer tube. The center tube is located inside the outer tube, and the lower end of the lower transition body is connected to the lower flange. The upper end of the lower transition body is connected to the upper ends of the center tube and the outer tube. A cavity is formed between the center tube and the outer tube. A counterweight injection hole connected to the cavity is provided on the outer tube or the upper transition body or the lower transition body, and the cavity can be filled with a counterweight.

[0015] Preferably, the weight is liquid.

[0016] Preferably, the drill bit comprises a drill bit body, a connecting stud is provided at the upper end of the drill bit body, the connecting stud is integrally formed with the drill bit body, a leading portion is provided at the lower end of the drill bit body, a reaming portion is provided on the side wall of the drill bit body, and circular teeth and elliptical teeth are arranged on the reaming portion.

[0017] Preferably, the elliptical teeth are located below the circular teeth.

[0018] The technical solution of the present invention has the following significant beneficial effects:

[0019] The liner hanger in the liner drilling running tool of the present invention can ensure the safe installation of the running tool, the liner and the surrounding pipe, reduce the possibility of separation of the running tool, the liner and the surrounding pipe, and shorten the abnormal production time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

[0021] Figure 1 It is a schematic diagram of the structure of the liner drilling delivery tool in an embodiment of the present invention;

[0022] Figure 2 Schematic diagram of the structure of the liner hanger in an embodiment of the present invention;

[0023] Figure 3 It is a structural schematic diagram of a drill rod in an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the structure of a drill collar in an embodiment of the present invention;

[0025] Figure 5 Schematic diagram of the structure of the drill bit in an embodiment of the present invention.

[0026] Reference numerals of the above drawings:

[0027] 1. Tail pipe hanger; 101. Tube body; 102. Slips; 103. Screws; 104. Connecting rod; 105. Guide block; 106. Screws; 107. Sealing ring; 108. Sleeve; 109. Insert; 1010. Positioning screw; 1011. Shear pin; 2. Tail pipe; 3. Propeller; 4. Motor; 5. Locking pin; 6. Rotating short section; 7. Drill bit; 71. Leading eye; 72. Expanding eye; 73. Circular teeth; 74. Elliptical teeth; 75. Drill bit body; 76. Connecting stud; 8. Motor torque output lock; 9. Drill Collar; 91, upper flange; 92, upper transition body; 93, counterweight; 94, center tube; 95, outer tube; 96, lower transition body; 97, lower flange; 98, counterweight injection hole; 10, outer surrounding tube; 11, drill pipe; 111, drill pipe body; 112, drill pipe external thread; 113, drill pipe female joint internal thread; 114, drill pipe female joint; 115, drill pipe female joint internal thread; 116, drill pipe male joint external thread; 117, drill pipe male joint; 118, drill pipe male joint internal thread; 12, fixed bracket; 13, tie-back short section. DETAILED DESCRIPTION

[0028] The details of the present invention can be more clearly understood by combining the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on another element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the communication between the two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0030] In order to reduce the possibility of the running tool, the liner 2 and the surrounding pipe being separated, thereby shortening the abnormal production time, a liner 2 drilling running tool is proposed in the embodiment of the present application. Figure 1 This is a schematic diagram of the structure of the liner 2 drilling delivery tool in an embodiment of the present invention. Figure 2 FIG. 1 is a schematic diagram of the structure of the liner hanger 1 in an embodiment of the present invention. Figure 1 and Figure 2 As shown, the liner 2 drilling delivery tool may include: a fixed support 12, an outer surrounding pipe 10, a liner hanger 1, a liner 2, and a drilling mechanism; the outer surrounding pipe 10 is connected to the lower part of the fixed support 12, the liner hanger 1 is installed on the fixed support 12, the lower end of the liner hanger 1 is installed with a surrounding pipe, the middle of the liner hanger 1 is penetrated with a drilling mechanism, the liner hanger 1 includes: a pipe body 101, a slip 102, a connecting rod 104, a sliding sleeve 108, and an insert 109, a through hole is opened on the side wall of the pipe body 101, the slip 102 is sleeved on the lower part of the pipe body 101, and the insert 109 is sleeved on the upper part of the tube body 101, and the sliding sleeve 108 is sleeved on the outside of the insert tube 109 and the tube body 101. An annular space is formed between the sliding sleeve 108, the insert tube 109 and the tube body 101, and the annular space is connected to the through hole. The sliding sleeve 108 can slide along the insert tube 109 and the tube body 101. The sliding sleeve 108 is connected to the slip 102 through the connecting rod 104. The side wall of the tube body 101 has a guide part with a diameter gradually increasing from top to bottom. The slip 102 is located above the guide part. When the slip 102 moves downward, the slip 102 expands radially under the action of the guide part.

[0031] When the liner drilling delivery tool in the embodiment of the present application delivers the liner 2, drilling mechanism and other tools into the well, it can firmly hang the surrounding pipe, drilling mechanism and other tools on the fixed support 12 through the liner hanger 1. The specific process is as follows: when the drilling fluid is input into the liner 2 to drive the drilling mechanism, the drilling fluid will enter the annular space of the liner hanger 1 to increase the pressure in the annular space, thereby driving the sleeve 108 to slide downward. In the process of sliding downward, the sleeve 108 drives the slip 102 to slide downward through the connecting rod 104. Since there is a guide portion with a diameter gradually increasing from top to bottom on the side wall of the pipe body 101, the slip 102 is located above the guide portion. When the slip 102 moves downward, the slip 102 expands radially under the action of the guide portion. In this way, the slip 102 will be inserted into the gap between the body and the fixed support 12, so that the liner hanger 1 and the fixed support 12 are more firmly fixed. At the same time, when the drilling mechanism is drilling, the pressure of the drilling fluid can continuously exert downward pressure on the slips 102 to prevent the slips 102 from moving back upward and loosening. The above method reduces the possibility of the running tool, the tail pipe 2 and the surrounding pipe being separated, thereby shortening the abnormal production time.

[0032] In order to better understand the tail pipe 2 drilling delivery tool in the embodiment of the present application, it will be further explained and illustrated below. Figure 1 As shown, the liner 2 drilling delivery tool may include: a fixed bracket 12, an outer surrounding pipe 10, a liner hanger 1, a liner 2, and a drilling mechanism. Among them, the fixed bracket 12 is used to hang the liner hanger 1, and the lower part of the fixed bracket 12 can be connected to the outer surrounding pipe 10 in a threaded connection manner, and the outer surrounding pipe 10 is used to protect the drilling mechanism and the liner 2. The liner hanger 1 is installed in the fixed bracket 12, and the liner 2 is installed at the lower end of the liner hanger 1. The liner 2 extends downward and is located inside the outer surrounding pipe 10. A drilling mechanism is penetrated in the middle of the liner hanger 1, and the drilling mechanism can be hung into the liner 2 through the liner hanger 1.

[0033] like Figure 2 As shown, the liner hanger 1 may include: a tube body 101, a slip 102, a connecting rod 104, a sleeve 108, and an insert 109. A through hole is provided on the side wall of the tube body 101, the slip 102 is sleeved on the lower part of the tube body 101, the insert 109 is sleeved on the upper part of the tube body 101, the sleeve 108 is sleeved on the outside of the insert 109 and the tube body 101, and the sleeve 108 can slide along the insert 109 and the tube body 101. The insert 109 is fixedly connected to the tube body 101 by a positioning screw 1010, and a shear pin 1011 is provided between the insert 109 and the sleeve 108. A step portion is provided on the side wall of the tube body 101, and the step portion is located between the sleeve 108 and the slip 102, and the step portion can limit the sleeve 108. A guide block 105 is welded above the step portion of the tube body 101, and the sleeve 108 is at a distance from the step portion. When the sleeve 108 slides downward along the guide block 105 for a distance, the step portion can resist the sleeve 108 to prevent the sleeve 108 from sliding further down.

[0034] like Figure 2 As shown, an annular space is formed between the sliding sleeve 108, the inserting tube 109 and the tube body 101, and the annular space is connected to the through hole. A sealing ring 107 is arranged between the sliding sleeve 108 and the inserting tube 109, and a sealing ring 107 is arranged between the sliding sleeve 108 and the tube body 101, so that the annular space has good sealing performance except for the through hole.

[0035] like Figure 2 As shown, the sleeve 108 is connected to the slip 102 through a connecting rod 104, and there can be multiple connecting rods 104, which are circumferentially distributed around the sleeve 108. The upper end of the connecting rod 104 is connected to the sleeve 108 through a screw 106, and the lower end of the connecting rod 104 is connected to the slip 102 through a screw 103.

[0036] like Figure 2As shown, the side wall of the pipe body 101 has a guide portion whose diameter gradually increases from top to bottom, and the slip 102 is located above the guide portion. When the slip 102 moves downward, the slip 102 expands radially under the action of the guide portion. When the drilling fluid enters the annular space through the through hole of the pipe body 101, the pressure in the annular space increases. Since the insert 109 is fixedly connected to the pipe body 101, the pressure can only drive the sleeve 108 to cut off the shear pin 1011 and slide downward. In the process of sliding downward, the sleeve 108 drives the slip 102 to slide downward through the connecting rod 104. The slip 102 expands radially under the action of the guide portion. In this way, the slip 102 will be inserted into the gap between the body and the fixed bracket 12, so that the tail pipe hanger 1 is more firmly suspended on the fixed bracket 12. At the same time, when the drilling mechanism is drilling, the pressure of the drilling fluid can continuously apply downward pressure to the slip 102 to prevent the slip 102 from moving back upward and loosening.

[0037] like Figure 1 As shown, in a feasible embodiment, the drilling mechanism may include: a drill pipe 11; a propeller 3 connected below the drill pipe 11; a drill collar 9 connected below the propeller 3; a motor 4 connected below the drill collar 9; and a drill bit connected to the motor 4. The propeller 3 can be extended and retracted, which can be used to compensate for the difference in length between the inner and outer pipes 95 that may be caused by thermal expansion during the drilling process, and can also provide drilling pressure for the drill bit. The motor 4 is a hydraulic motor that can rotate under the pressure of the drilling fluid without the need for other devices to drive the rotation.

[0038] In a preferred embodiment, Figure 1 As shown, a tie-back sub 13 is connected below the tail pipe 2, and a rotating sub 6 is connected below the tie-back sub 13. The motor 4 is located in the tie-back sub 13. A locking pin 5 is provided between the housing of the motor 4 and the tie-back sub 13. A motor torque output lock 8 is connected between the rotating sub 6 and the shaft of the motor 4, and the motor torque output lock 8 is located in the rotating sub 6. The locking pin 5 can lock the housing of the motor 4 with the tie-back sub 13 in the radial direction, thereby making the housing of the motor 4, the tail pipe 2 and the tie-back sub 13 integrated; the motor torque output lock 8 can lock the shaft of the motor 4 with the rotating sub 6 in the radial direction, thereby making the shaft of the motor 4 and the rotating sub 6 integrated. The locking and separation of the housing of the motor 4 and the tie-back sub 13 are controlled by the drilling fluid pressure. The tie-back sub 13 and the rotating sub 6 can be connected by a bearing, and the tie-back sub 13 and the rotating sub 6 can rotate relative to each other through the bearing. The housing of the motor 4 is locked to the tie-back sub 13 by a locking pin 5 that can withstand high torque, and the shaft of the motor 4 is locked to the rotating sub 6 by a motor torque output lock 8, so that the torque of the motor 4 is transmitted to the drill bit 7 at the lower end of the tail pipe 2 column through the rotating sub 6. In this way, the two subs ensure that only the drill bit 7 and the rotating sub 6 rotate during sliding drilling.

[0039] In a preferred embodiment, Figure 3 Schematic diagram of the structure of the drill rod in the embodiment of the present invention. Figure 3 As shown, the drill rod 11 includes: a drill rod body 111, a drill rod female joint 114, and a drill rod male joint 117. The end of the drill rod body 111 is provided with a drill rod external thread 112. The drill rod body 111 is connected with the drill rod female joint 114 and the drill rod male joint 117 in sequence, wherein the drill rod external thread 112 matches with the drill rod female joint internal thread 113, the drill rod female joint internal thread 113 matches with the drill rod male joint external thread 116, and the lower end of the drill rod male joint 117 is provided with a drill rod male joint internal thread 118. The drill rod female joint 114 and the drill rod male joint 117 can be used to adjust the length of the drill rod 11, and the drill rod 11 can also be quickly and conveniently connected to the thruster 3.

[0040] In a preferred embodiment, Figure 4 FIG. 1 is a schematic diagram of the structure of a drill collar in an embodiment of the present invention. Figure 4 As shown, the drill collar 9 may include: an upper flange 91, an upper transition body 92, a central tube 94, an outer tube 95, a lower transition body 96, and a lower flange 97. The upper end of the upper transition body 92 is connected to the upper flange 91 by welding, the lower end of the upper transition body 92 is connected to the upper end of the central tube 94 and the upper end of the outer tube 95 by welding, the central tube 94 is located inside the outer tube 95, the lower end of the lower transition body 96 is connected to the lower flange 97 by welding, the upper end of the lower transition body 96 is connected to the upper ends of the central tube 94 and the outer tube 95 by welding, a cavity is formed between the central tube 94 and the outer tube 95, and a counterweight injection hole 98 connected to the cavity is provided on the outer tube 95 or the upper transition body 92 or the lower transition body 96, and the cavity can be filled with a counterweight 93. Preferably, the counterweight 93 may be a liquid. By adjusting the amount and density of the liquid weight 93 injected into the cavity, the weight of the weight 93 can be effectively controlled when the cavity is limited, thereby achieving the purpose of controlling the appropriate weight of the drill collar 9.

[0041] In a preferred embodiment, Figure 5 Schematic diagram of the structure of the drill bit in the embodiment of the present invention. Figure 5As shown, the drill bit 7 may include a drill bit body 75, the upper end of the drill bit body 75 is provided with a connecting stud 76, the connecting stud 76 and the drill bit body 75 are integrally formed, and the connecting stud 76 is used to connect the drill bit body 75 with the upper component, the lower end of the drill bit body 75 has a lead hole portion 71, and the side wall of the drill bit body 75 has a reaming portion 72, and the reaming portion 72 is arranged with circular teeth 73 and elliptical teeth 74. The circular teeth 73 specifically refer to the end face of the teeth being circular, and the elliptical teeth 74 specifically refer to the end face of the teeth being elliptical. The elliptical teeth 74 are located below the circular teeth 73. The composite cutting structure composed of the circular teeth 73 and the elliptical teeth 74 jointly undertakes the task of cutting and breaking rocks. The elliptical teeth 74 can better eat into the rock to form pre-crushing, thereby making it easier for the circular teeth 73 to eat into the formation, and finally improving the rock breaking efficiency of the drill bit.

[0042] Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "an" used to describe an element, ingredient, part or step is not intended to exclude other elements, ingredients, parts or steps.

[0043] Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and features of the present invention. The purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A liner drilling running tool, characterized in that: include: A fixed support, an outer surrounding pipe, a tail pipe hanger, a tail pipe, and a drilling mechanism; the outer surrounding pipe is connected to the lower part of the fixed support, the tail pipe hanger is installed on the fixed support, the lower end of the tail pipe hanger is installed with the surrounding pipe, and the middle part of the tail pipe hanger is penetrated with a drilling mechanism, the tail pipe hanger comprises: a pipe body, a slip, a connecting rod, a sliding sleeve, and an insert sleeve, a through hole is opened on the side wall of the pipe body, the slip sleeve is sleeved on the lower part of the pipe body, the insert sleeve is sleeved on the upper part of the pipe body, the sliding sleeve is sleeved on the outside of the insert sleeve and the pipe body, an annular space is formed between the sliding sleeve, the insert sleeve and the pipe body, the annular space is connected with the through hole, the sliding sleeve can slide along the insert sleeve and the pipe body, the sliding sleeve is connected with the slip sleeve through the connecting rod, a guide portion with a diameter gradually increasing from top to bottom is provided on the side wall of the pipe body, the slip sleeve is located above the guide portion, and when the slip sleeve moves downward, the slip sleeve expands radially under the action of the guide portion; The outer wall of the slip is provided with a friction part; the side wall of the pipe body is provided with a step part, the step part is located between the sleeve and the slip, and the step part can limit the sleeve; the insert is fixedly connected to the pipe body by a positioning screw, and a shear pin is arranged between the insert and the sleeve; the drilling mechanism comprises: a drill pipe; a propeller connected below the drill pipe, the propeller can be extended and retracted to provide drilling pressure; a drill collar connected below the propeller; a motor connected below the drill collar, the motor can rotate under the pressure of the drilling fluid; a drill bit connected to the motor in a transmission manner; a tie-back nipple is connected below the tail pipe, a rotating nipple is connected below the tie-back nipple, the motor is located in the tie-back nipple, a locking pin is arranged between the housing of the motor and the tie-back nipple, a motor torque output lock is connected between the rotating nipple and the shaft of the motor, and the motor torque output lock is located in the rotating nipple; the tie-back nipple and the rotating nipple are connected through a bearing.

2. The liner drilling running tool according to claim 1, characterized in that: The drill rod comprises: a drill rod body, a drill rod female joint, and a drill rod male joint. The end of the drill rod body is provided with a drill rod external thread. The drill rod body is connected with the drill rod female joint and the drill rod male joint in sequence, wherein the drill rod external thread matches with the drill rod female joint internal thread, the drill rod female joint internal thread matches with the drill rod male joint external thread, and the lower end of the drill rod male joint is provided with a drill rod male joint internal thread.

3. The liner drilling running tool according to claim 1, characterized in that: The drill collar includes: an upper flange, an upper transition body, a center tube, an outer tube, a lower transition body, and a lower flange. The upper end of the upper transition body is connected to the upper flange, and the lower end of the upper transition body is connected to the upper end of the center tube and the upper end of the outer tube. The center tube is located inside the outer tube. The lower end of the lower transition body is connected to the lower flange, and the upper end of the lower transition body is connected to the upper ends of the center tube and the outer tube. A cavity is formed between the center tube and the outer tube. A counterweight injection hole connected to the cavity is provided on the outer tube or the upper transition body or the lower transition body, and the cavity can be filled with a counterweight.

4. The liner drilling running tool according to claim 3, characterized in that: The weight is liquid.

5. The liner drilling running tool according to claim 1, characterized in that: The drill bit comprises a drill bit body, the upper end of the drill bit body is provided with a connecting stud, the connecting stud is integrally formed with the drill bit body, the lower end of the drill bit body is provided with a leading eye portion, the side wall of the drill bit body is provided with an expanding eye portion, and the expanding eye portion is arranged with circular teeth and elliptical teeth.

6. The liner drilling running tool according to claim 5, characterized in that: The elliptical teeth are located below the circular teeth.

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