CN217538611U - Anti-blocking wear-resistant double-wall drill rod of bimetal composite pipe - Google Patents
Anti-blocking wear-resistant double-wall drill rod of bimetal composite pipe Download PDFInfo
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- CN217538611U CN217538611U CN202221200651.1U CN202221200651U CN217538611U CN 217538611 U CN217538611 U CN 217538611U CN 202221200651 U CN202221200651 U CN 202221200651U CN 217538611 U CN217538611 U CN 217538611U
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Abstract
The utility model provides an anti-jamming wear-resistant double-wall drill rod of a bimetal composite pipe, an outer layer drill rod is formed by welding a drill rod pipe body and an internal thread joint, the external thread joint is welded, overflowing grooves are uniformly distributed on the conical surface steps of the external thread joint, the overflowing grooves are linearly changed along the axial depth, and a high-hardness wear-resistant alloy layer is arranged on the conical surface steps between the overflowing grooves; the inner layer connecting pipe is a bimetal composite pipe and is assembled and fixed on the inner surface of the outer layer drill rod through an upper connector and a lower connector; its advantage does: the external thread joint structure of the drill rod has a cutting function similar to a drill bit, and can cut and crush collapsed/deposited rock debris or a necked well hole in a back reaming hole, so that the blockage and blockage relieving of the whole drill column are realized, the corrosion resistance and the erosion resistance of the surface of the pipe body are effectively improved through the inner pipe body of the double-wall drill rod, the failure risk of the inner pipe body is reduced, and the service life is prolonged.
Description
Technical Field
The utility model belongs to the technical field of the double-walled drilling rod technique and specifically relates to a wear-resisting double-walled drilling rod of anti-sticking of bimetal composite pipe.
Background
In the drilling operation of petroleum, natural gas, geology and geothermol power, the stratum which is easy to leak is often drilled, and the drilling fluid is leaked in the stratum, so that great economic loss is caused to the drilling operation, and great difficulty is brought to the drilling operation. The adoption of gas drilling is an effective drilling mode for drilling the stratum which is easy to leak. In order to more effectively perform gas drilling operation, a special drill rod-a double-wall drill rod capable of establishing an inner annular hollow double-layer drilling fluid channel and an outer annular hollow double-layer drilling fluid channel is developed. The double-wall drill rod consists of an inner layer pipe body and an outer layer pipe body. An annular space is formed between the inner pipe body and the outer pipe body and is a first transmission channel of the drilling fluid (or gas); and the inner hole of the inner pipe body is a second transmission channel of the drilling fluid. Each double-wall drill pipe is connected with the thread of the outer drill pipe to form a drill pipe column so as to transmit torque and bit pressure and bear the pressure of drilling fluid. Because the high-pressure air in gas drilling often contains very high oxygen and even adopts carbon dioxide gas, the inner wall of the inner layer drill pipe body is often corroded in the underground high-temperature and humid environment. Meanwhile, because the returned gas contains a large amount of rock debris, the rock debris flowing at high speed collides with the inner wall of the inner-layer drill pipe body, so that an erosion pit is formed on the inner surface of the inner-layer pipe, and not only is the inner wall of the inner-layer pipe abraded, but also erosion (scouring corrosion) is generated at the same time. In addition, under gas drilling operating mode and horizontal segment drilling operating mode, the poor stability of the wall of a well, the wall of a well falls the piece, the condition of collapsing is general, the risk of drilling rod jamming is very high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve the not enough of prior art existence, and provide a wear-resisting double-walled drilling rod of anti-sticking of bimetal composite pipe.
The technical scheme of the utility model is that: an anti-blocking wear-resistant double-wall drill rod of a bimetal composite pipe comprises an outer drill rod, an inner connecting pipe, an upper connector and a lower connector, wherein the outer drill rod is formed by welding a drill rod pipe body and an internal thread connector, the external thread connector of the drill rod is welded, overflowing grooves are uniformly distributed on conical surface steps of the external thread connector of the drill rod, the depth of the overflowing grooves along the axial direction changes linearly, and a high-hardness wear-resistant alloy layer is arranged on the conical surface steps between the overflowing grooves; the inner layer connecting pipe is a bimetal composite pipe, and is assembled and fixed on the inner surface of the outer layer drill rod through the upper connector and the lower connector.
Furthermore, the overflow groove is of a multi-strip spiral type.
Furthermore, the taper of the conical surface step of the external thread joint is greater than that of the bottom surface of the overflowing groove.
Furthermore, the taper of the conical surface step of the external thread joint is 30 degrees, and the axial taper of the bottom surface of the overflowing groove is 20 degrees.
Furthermore, the number of the overflowing grooves is 6, and the width of the overflowing groove is 1/12 of the circumference.
Furthermore, the ratio of the cross-sectional area of the beginning of the bottommost part of the overflow groove to the cross-sectional area of the welding neck section of the joint is more than or equal to 10%, the top part of the overflow groove penetrates through the outer surface of the whole joint, and the thickest depth of the top part of the overflow groove is less than or equal to 8mm.
Furthermore, the high-hardness wear-resistant alloy layer is formed by welding in a laser cladding mode, and the thickness of the high-hardness wear-resistant alloy layer is 2-4 mm.
Further, the high-hardness wear-resistant alloy layer is located in the 1/2 area of the top of the slope shoulder surface.
Furthermore, the bimetal composite pipe body is formed by compounding an outer-layer carbon steel pipe body and an inner-layer corrosion-resistant alloy pipe, and the compounding mode is not limited to hydraulic compounding, blasting compounding and metallurgical compounding.
Furthermore, the bimetal composite pipe is fixedly assembled with the upper connector and the lower connector through external threads at two ends of the outer carbon steel pipe body in a threaded connection mode, the yield strength of the outer carbon steel pipe body material of the bimetal composite pipe body is greater than or equal to 379MPa, the thickness of the outer carbon steel pipe body material of the bimetal composite pipe body is greater than or equal to 4.5mm, the yield strength of the inner corrosion-resistant alloy pipe material of the bimetal composite pipe body is greater than or equal to 300MPa, the thickness of the inner corrosion-resistant alloy pipe material of the bimetal composite pipe body is greater than or equal to 0.5mm, and the bonding strength of the inner corrosion-resistant alloy pipe of the bimetal composite pipe body and the outer base body is greater than or equal to 200MPa.
The utility model has the advantages that: a plurality of spiral overflowing grooves are uniformly distributed on the steps of the conical surface of the external thread joint of the drill rod, and a wear-resistant alloy layer with excellent mutual fusibility with the joint body material is arranged on the conical surface between the overflowing grooves. The external thread joint structure of the drill rod has the cutting function similar to a drill bit, and can cut and crush collapsed/deposited rock debris or a necked borehole in an undercut, so that the blockage and blockage relieving of the whole drill string are realized. Meanwhile, the bimetal composite pipe is used as the inner layer pipe body of the double-wall drill rod, and the characteristic that the inner layer pipe body of the bimetal composite pipe is made of a corrosion-resistant metal material is utilized, so that the corrosion resistance and the erosion resistance of the surface of the pipe body are effectively improved, the failure risk of the inner layer pipe body is reduced, and the service life of the double-wall drill rod is prolonged.
Drawings
Fig. 1 is an overall schematic view of the present invention.
FIG. 2 is a sectional view of the outer drill rod male connector with a taper step.
Reference numerals: 1-outer layer drill pipe; 2-inner layer connecting pipe; 3-an upper connector; 4-lower connector; 5-a wear-resistant alloy layer; 6-external thread joint; 7-female screw joint; 8-drilling rod tube body; 12-inner layer corrosion resistant alloy tube; 13-a conical step; 14-overflow groove.
Detailed Description
Referring to fig. 1-2, the anti-blocking wear-resistant double-wall drill rod of the bimetal composite pipe comprises an outer-layer drill rod 1, an inner-layer connecting pipe 2, an upper connector 3 and a lower connector 4, wherein the outer-layer drill rod 1 is formed by welding a drill rod pipe body 8 and an internal thread connector 7, and an external thread connector 6, overflow grooves 14 are uniformly distributed on conical steps 13 of the external thread connector 6, the depth of the overflow grooves 14 along the axial direction is changed linearly, and high-hardness wear-resistant alloy layers 5 are arranged on the conical steps 13 between the overflow grooves 14; the inner layer connecting pipe 2 is a bimetal composite pipe, and the inner layer connecting pipe 2 is assembled and fixed on the inner surface of the outer layer drill rod 1 through an upper connector 3 and a lower connector 4.
The overflow groove 14 is a multi-spiral type.
The taper of the taper step 13 of the male adapter 6 is larger than that of the bottom surface of the overflow groove 14.
The taper of the taper step 13 of the external thread joint 6 is 30 degrees, and the axial taper of the bottom surface of the overflow groove 14 is 20 degrees.
The number of the overflow grooves 14 is 6, and the width of the overflow grooves 14 is 1/12 of the circumference.
The ratio of the cross-sectional area of the beginning of the bottommost part of the overflow groove 14 to the cross-sectional area of the welding neck section of the joint is more than or equal to 10%, the top part of the overflow groove 14 penetrates through the outer surface of the whole joint, and the thickest depth of the top part of the overflow groove 14 is less than or equal to 8mm.
The high-hardness wear-resistant alloy layer 5 is formed by welding in a laser cladding mode, and the thickness is 2-4 mm.
The high-hardness wear-resistant alloy layer 5 is positioned in the 1/2 area of the top of the shoulder surface of the slope.
The bimetal composite pipe body is formed by compounding an outer-layer carbon steel pipe body and an inner-layer corrosion-resistant alloy pipe 12, and the compounding mode is not limited to hydraulic compounding, blasting compounding and metallurgical compounding.
The bimetal composite pipe is fixedly assembled with the upper connector 3 and the lower connector 4 through external threads at two ends of an outer carbon steel pipe body in a threaded connection mode, the yield strength of the outer carbon steel pipe body material of the bimetal composite pipe body is larger than or equal to 379MPa, the thickness of the outer carbon steel pipe body material is larger than or equal to 4.5mm, the yield strength of the inner corrosion-resistant alloy pipe 12 material of the bimetal composite pipe body is larger than or equal to 300MPa, the thickness of the inner corrosion-resistant alloy pipe 12 of the bimetal composite pipe body is larger than or equal to 0.5mm, and the bonding strength of the inner corrosion-resistant alloy pipe 12 of the bimetal composite pipe body and an outer base body is larger than or equal to 200MPa.
Claims (10)
1. The utility model provides a wear-resisting double-walled drilling rod of anti-sticking of bimetal composite pipe, double-walled drilling rod include outer drilling rod (1), inlayer connecting pipe (2), go up connector (3), connector (4) down, its characterized in that: the outer layer drill rod (1) is formed by welding a drill rod pipe body (8) and an internal thread joint (7), the external thread joint (6) is welded, overflowing grooves (14) are uniformly distributed on conical surface steps (13) of the external thread joint (6), the depths of the overflowing grooves (14) along the axial direction are linearly changed, and high-hardness wear-resistant alloy layers (5) are arranged on the conical surface steps (13) between the overflowing grooves (14); the inner layer connecting pipe (2) is a bimetal composite pipe, and the inner layer connecting pipe (2) is assembled and fixed on the inner surface of the outer layer drill rod (1) through the upper connector (3) and the lower connector (4).
2. The anti-seize wear-resistant double-wall drill rod for the bimetal composite pipe as claimed in claim 1, is characterized in that: the overflowing grooves (14) are in a multi-strip spiral shape.
3. The anti-seize wear-resistant double-wall drill pipe for the bimetal composite pipe according to claim 1 or 2, characterized in that: the taper of the conical surface step (13) of the external thread joint (6) is greater than that of the bottom surface of the overflow groove (14).
4. The anti-seize wear-resistant double-wall drill pipe for the bimetal composite pipe according to claim 1 or 2, characterized in that: the taper of the conical surface step (13) of the external thread joint (6) is 30 degrees, and the axial taper of the bottom surface of the overflowing groove (14) is 20 degrees.
5. The anti-seize wear-resistant double-wall drill pipe for the bimetal composite pipe according to claim 1 or 2, characterized in that: the number of the overflowing grooves (14) is 6, and the width of the overflowing grooves (14) is 1/12 of the circumference.
6. The anti-seize wear-resistant double-wall drill pipe for the bimetal composite pipe according to claim 1 or 2, characterized in that: the ratio of the cross-sectional area of the beginning part of the bottommost part of the overflowing groove (14) to the cross-sectional area of the welding neck section of the joint is more than or equal to 10%, the top part of the overflowing groove penetrates through the outer surface of the whole joint, and the thickest depth of the top part of the overflowing groove (14) is less than or equal to 8mm.
7. The anti-seize wear-resistant double-wall drill rod for the bimetal composite pipe as claimed in claim 1, is characterized in that: the high-hardness wear-resistant alloy layer (5) is formed by welding in a laser cladding mode, and the thickness is 2-4 mm.
8. The anti-seize wear-resistant double-wall drill rod for the bimetal composite pipe as claimed in claim 1, is characterized in that: the high-hardness wear-resistant alloy layer (5) is positioned in the 1/2 area of the top of the slope shoulder surface.
9. The anti-seize wear-resistant double-wall drill rod for the bimetal composite pipe as claimed in claim 1, is characterized in that: the bimetal composite pipe body is formed by compounding an outer-layer carbon steel pipe body and an inner-layer corrosion-resistant alloy pipe (12), and the compounding mode is not limited to hydraulic compounding, blasting compounding and metallurgical compounding.
10. The anti-seize wear-resistant double-wall drill pipe for bimetallic composite pipes as claimed in claim 1 or 9, characterized in that: the bimetal composite pipe is assembled and fixed with the upper connector (3) and the lower connector (4) through external threads at two ends of an outer carbon steel pipe body by adopting threaded connection, the yield strength of the outer carbon steel pipe body material of the bimetal composite pipe body is more than or equal to 379MPa, the thickness of the outer carbon steel pipe body material of the bimetal composite pipe body is more than or equal to 4.5mm, the yield strength of the inner corrosion-resistant alloy pipe (12) material of the bimetal composite pipe body is more than or equal to 300MPa, the thickness of the inner corrosion-resistant alloy pipe (12) of the bimetal composite pipe body is more than or equal to 0.5mm, and the bonding strength of the inner corrosion-resistant alloy pipe (12) of the bimetal composite pipe body and an outer base body is more than or equal to 200MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221200651.1U CN217538611U (en) | 2022-05-19 | 2022-05-19 | Anti-blocking wear-resistant double-wall drill rod of bimetal composite pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221200651.1U CN217538611U (en) | 2022-05-19 | 2022-05-19 | Anti-blocking wear-resistant double-wall drill rod of bimetal composite pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217538611U true CN217538611U (en) | 2022-10-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221200651.1U Active CN217538611U (en) | 2022-05-19 | 2022-05-19 | Anti-blocking wear-resistant double-wall drill rod of bimetal composite pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217538611U (en) |
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2022
- 2022-05-19 CN CN202221200651.1U patent/CN217538611U/en active Active
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