Drill rod with anti-jamming joint

Abstract

The present invention provides a drill pipe with an anti-jamming joint, wherein a joint B is friction-welded at one end of the pipe body, a joint A is friction-welded at the other end of the pipe body, an external thread is provided at one end of the body, the other end of the body is connected to one end of a conical step, the other end of the conical step is connected to the joint welding neck, a plurality of evenly distributed axial grooves and circumferential grooves are provided on the outer wall of the conical step, the depth of the axial groove varies linearly along the conical step, the depth of the circumferential groove varies linearly along the conical step, and the bottom of the intersection of the axial groove and the circumferential groove is located on the same conical surface; the advantages are: the present invention processes axial and circumferential grooves with a certain depth and distributed at equal intervals on the conical step, thereby forming milling teeth on the conical step, so that the joint A has the cutting function of a milling tooth drill bit, and can cut deposited rock cuttings or necked wellbores, and the axial grooves provide a flow channel for the cut rock cuttings, thereby effectively breaking the sand deposition layer, and realizing the unblocking and unjamming of the entire drill string when encountering jams.

Description

Technical Field

[0001] The invention relates to the field of drill rods for oil and natural gas exploration and development, in particular to a drill rod with an anti-jamming joint. Background Art

[0002] During the exploration and development of oil and natural gas (coalbed methane), the borehole size shrinkage, well wall block loss, collapse, and rock debris deposition caused by poor well wall stability often cause the drill string to get stuck. Due to the structural characteristics that the outer diameter of the drill pipe external threaded joint is much larger than the size of the pipe body (for example, the outer diameter of the drill pipe joint corresponding to the 127mm drill pipe body is 168mm), the blocking point is often located on the 35° slope surface of the external threaded joint. During the unblocking operation of lifting, twisting, lifting + twisting, the friction and wear between the well wall (sand sedimentation) and the drill pipe joint often leads to a reduction in the effective cross-section of the drill pipe external threaded joint at the 35° slope surface, and even the high temperature generated by friction causes the joint's structure to undergo a phase change, resulting in failure accidents such as plastic deformation or fracture of the drill pipe. Especially under gas drilling conditions and horizontal drilling conditions, the stability of the well wall is poor, well wall block falling and collapse are common, the risk of drill pipe jamming is very high, and accidents of external threaded joints breaking and failing in the drill pipe unjamming process occur frequently, which restricts the application and development of gas drilling technology and horizontal well drilling technology. Summary of the invention

[0003] The purpose of the present invention is to provide a drill rod with an anti-jamming joint in order to solve the deficiencies in the prior art.

[0004] The new technical solution adopted by the present invention is: a drill pipe with an anti-jamming joint, including a joint A, a joint B and a pipe body, one end of the pipe body is friction-welded with a joint B, and the joint B is provided with an internal thread; the other end of the pipe body is friction-welded with a joint A, and the joint A includes a body, a conical step, a joint welding neck, an axial groove and a circumferential groove, one end of the body is provided with an external thread, the other end of the body is connected to one end of the conical step, and the other end of the conical step is connected to the joint welding neck, the outer wall of the conical step is provided with a plurality of evenly distributed axial grooves and circumferential grooves, and the axial grooves and the circumferential grooves are criss-crossed, the depth of the axial groove changes linearly along the conical step, the depth of the circumferential groove changes linearly along the conical step, and the bottom of the intersection of the axial groove and the circumferential groove is located on the same conical surface with the same depth.

[0005] The taper of the conical step is 25-35°.

[0006] The cone angle of the axial groove is 15-25°.

[0007] The bottom diameter of the axial groove is 3-5 mm larger than the outer diameter of the joint welding neck, and the top of the axial groove passes through the body.

[0008] The width of the axial groove is 25.4 mm, and the bottom arc radius of the axial groove is 12.7 mm.

[0009] The direction of the circumferential groove is parallel to the axial direction of the joint A.

[0010] The bottoms of the circumferential grooves are evenly spaced along the conical surface, with a spacing of 10-15 mm.

[0011] The bottom diameter of the circumferential groove is 3-5 mm larger than the outer diameter of the joint welding neck.

[0012] The width of the circumferential groove is 20 mm, and the bottom arc radius of the circumferential groove is 10 mm.

[0013] The bottom of the circumferential groove is on the same conical surface and is the same as the conical surface of the axial groove.

[0014] The beneficial effects of the present invention are as follows: the present invention processes axial and circumferential grooves with a certain depth and distributed at equal intervals on the conical step, thereby forming milling teeth on the conical step, so that the joint A has the cutting function of a milling tooth drill bit, and can cut deposited rock cuttings or necked wellbores. The axial grooves provide flow channels for the cut rock cuttings, thereby effectively breaking up the sand layer, and achieving the unblocking and unjamming of the entire drill string when encountering obstructions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a structural schematic diagram of connector A; Figure 3 for Figure 2 Schematic diagram of the structure of AA; Figure 4 for Figure 2 Schematic diagram of the structure of BB.

[0016] Wherein: 1. Joint A, 101. Main body, 102. Conical step, 103. Joint welding neck, 104. Axial groove, 105. Circumferential groove, 2. Pipe body, 3. Joint B. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] A drill pipe with an anti-jamming joint, comprising a joint A1, a joint B3 and a pipe body 2, wherein one end of the pipe body 2 is friction-welded with a joint B3, and the joint B3 is provided with an internal thread; the other end of the pipe body 2 is friction-welded with a joint A1, and the joint A1 comprises a body 101, a conical step 102, a joint welding neck 103, an axial groove 104 and a circumferential groove 105, one end of the body 101 is provided with an external thread, and the other end of the body 101 is connected to the conical step 102 One end of the conical step 102 is connected to the joint welding neck 103 at the other end, and the outer wall of the conical step 102 is provided with a plurality of evenly distributed axial grooves 104 and circumferential grooves 105, and the axial grooves 104 and the circumferential grooves 105 are crisscrossed, the depth of the axial grooves 104 changes linearly along the conical step 102, the depth of the circumferential grooves 105 changes linearly along the conical step 102, and the bottom of the intersection of the axial grooves 104 and the circumferential grooves 105 is located on the same conical surface.

[0019] The taper of the conical step 102 is 25-35°.

[0020] The taper angle of the axial groove 104 is 15-25°.

[0021] The bottom diameter of the axial groove 104 is 3-5 mm larger than the outer diameter of the joint welding neck 103 , and the top of the axial groove 104 passes through the body 101 .

[0022] The width of the axial groove 104 is 25.4 mm, and the bottom arc radius of the axial groove 104 is 12.7 mm.

[0023] The direction of the circumferential groove 105 is parallel to the axial direction of the joint A1.

[0024] The bottoms of the circumferential grooves 105 are evenly spaced along the conical surface, with a spacing of 10-15 mm.

[0025] The bottom diameter of the circumferential groove 105 is 3-5 mm larger than the outer diameter of the joint welding neck 103 .

[0026] The width of the circumferential groove 105 is 20 mm, and the bottom arc radius of the circumferential groove 105 is 10 mm.

[0027] The bottom of the circumferential groove 105 is on the same conical surface and is the same as the conical surface of the axial groove 104 .

[0028] A drill pipe with an anti-jamming joint has axial grooves and circumferential grooves with a certain depth and evenly spaced distribution on the conical step, so that milling teeth are formed on the conical step, so that the joint A has the cutting function of a milling tooth drill bit, and can cut deposited rock cuttings or necked wellbores. The axial grooves provide a flow channel for the cut rock cuttings.

[0029] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A drill pipe with an anti-jamming joint, comprising a joint A, a joint B and a pipe body, characterized in that: A joint B is friction welded at one end of the tube body, and the joint B is provided with an internal thread; a joint A is friction welded at the other end of the tube body, and the joint A includes a body, a conical step, a joint welding neck, an axial groove and a circumferential groove. One end of the body is provided with an external thread, and the other end of the body is connected to one end of the conical step, and the other end of the conical step is connected to the joint welding neck. The outer wall of the conical step is provided with a plurality of evenly distributed axial grooves and circumferential grooves, and the axial grooves and the circumferential grooves are crisscrossed, the depth of the axial groove changes linearly along the conical step, the depth of the circumferential groove changes linearly along the conical step, and the bottom of the intersection of the axial groove and the circumferential groove is located on the same conical surface; the bottom of the circumferential groove is evenly spaced along the conical direction, and the spacing is 10-15mm; the width of the circumferential groove is 20mm, and the bottom arc radius of the circumferential groove is 10mm; the bottom of the circumferential groove is on the same conical surface, and is the same as the conical surface of the axial groove; the taper of the conical step is 25-35°.

2. A drill pipe with an anti-jamming joint according to claim 1, characterized in that: The cone angle of the axial groove is 15-25°.

3. A drill pipe with an anti-jamming joint according to claim 1 or 2, characterized in that: The bottom diameter of the axial groove is 3-5 mm larger than the outer diameter of the joint welding neck, and the top of the axial groove passes through the body.

4. A drill pipe with an anti-jamming joint according to claim 3, characterized in that: The width of the axial groove is 25.4 mm, and the bottom arc radius of the axial groove is 12.7 mm.

5. A drill pipe with an anti-jamming joint according to claim 1, characterized in that: The direction of the circumferential groove is parallel to the axial direction of the joint A.

6. A drill pipe with an anti-jamming joint according to claim 5, characterized in that: The bottom diameter of the circumferential groove is 3-5 mm larger than the outer diameter of the joint welding neck.

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