CN111706266A - Double-wall drill rod - Google Patents
Double-wall drill rod Download PDFInfo
- Publication number
- CN111706266A CN111706266A CN201910203553.XA CN201910203553A CN111706266A CN 111706266 A CN111706266 A CN 111706266A CN 201910203553 A CN201910203553 A CN 201910203553A CN 111706266 A CN111706266 A CN 111706266A
- Authority
- CN
- China
- Prior art keywords
- double
- drill rod
- sealing ring
- pipe
- sealing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000007789 sealing Methods 0.000 claims abstract description 77
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 239000011148 porous material Substances 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 3
- 208000034656 Contusions Diseases 0.000 abstract description 2
- 230000009519 contusion Effects 0.000 abstract description 2
- 238000004381 surface treatment Methods 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 230000008439 repair process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013523 data management Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/18—Pipes provided with plural fluid passages
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a double-wall drill rod. When the two double-wall drill rods are connected, the external threads at the lower end of the outer pipe of the first double-wall drill rod are connected with the internal threads at the upper end of the outer pipe of the second double-wall drill rod, the sealing ring of the assembly joint on the second double-wall drill rod is inserted into the step hole B of the lower joint of the first double-wall drill rod, the first fluid channels of the two double-wall drill rods are communicated with each other, the second fluid channels are communicated with each other, and the outer edge surface of the sealing ring and the inner edge surface of the step hole B are sealed through the sealing ring B, so that fluid in the first fluid channel. The invention has the advantages that the plug-in sealing male plug adopts a split structure, the sealing ring has certain aligning and aligning capability, and the sealing ring can be independently disassembled or replaced when the sealing groove is repaired or replaced, thereby saving time and labor; the sealing ring is small in size and can be subjected to surface treatment independently, so that the plugging sealing reliability is improved; and the O-shaped ring is replaced by the mountain-shaped sealing ring, so that the overturning and contusion probability of the sealing ring is reduced.
Description
Technical Field
The invention relates to a drill rod, in particular to a double-wall drill rod for drilling a double-wall drill rod.
Background
The double-wall drill rod drilling technology is a technology for drilling based on double-wall drill rods and auxiliary devices thereof, and mainly comprises a double-wall drill rod whole-well reverse circulation drilling technology, a double-wall drill rod gas-filled reverse circulation drilling technology, a double-drill rod gas-filled forward circulation drilling technology, an RDM (remote data management) technology and the like. Double-walled drill pipe implements one of the key devices of the drilling technology described above. The double-wall drill rod is also called a double-layer drill rod and consists of an inner pipe and an outer pipe, wherein the inner pipe is inserted into the outer pipe to form two fluid channels, one is an annular gap between the inner pipe and the outer pipe, and the other is an inner pore channel of the inner pipe; after the double-wall drill rods are connected, the inner pipes are in inserted connection and sealing to realize fluid isolation between the annular gap and the inner hole channel of the inner pipe. The existing splicing seal usually adopts an O-shaped seal ring, the seal ring is curled and bruised frequently due to frequent disassembly of a connector in the use process of drilling, the pressure-bearing capacity of the splicing seal is reduced, and the splicing seal is often failed; moreover, sealed slot and inner tube are on an integral part, and the slot can't be cleared up, and the sealing washer slot is rusty or can't repair alone after wearing and tearing, if repair then need change whole inner tube, waste time and energy.
Disclosure of Invention
The invention aims to provide a double-wall drill rod, which improves the reliability and the service life of the plug-in sealing of the double-wall drill rod and improves the simplicity and convenience of cleaning and repairing a sealing groove, and the technical scheme is as follows:
a double-wall drill rod comprises an outer pipe and an inner pipe, wherein the outer pipe is provided with a central hole, and the inner pipe is inserted into the central hole of the outer pipe and fixed in the outer pipe; the inner pipe is provided with an axial through hole, and the lower end of the through hole is provided with a step hole; the middle part of the outer edge surface of the inner pipe is provided with an outward boss, the boss of the inner pipe is fixed on the central hole of the outer pipe, an annular gap is formed between the inner pipe and the central hole of the outer pipe, and an axial pore channel is axially processed on the boss of the inner pipe.
The upper end of the central hole of the outer pipe is provided with an enlarged stepped hole; a snap spring groove is processed in the step hole at the central hole end of the outer pipe, a snap spring B is placed in the snap spring groove, and the boss of the inner pipe is fixed on the step hole of the outer pipe through the snap spring B.
The inner pipe consists of an upper assembly joint, a connecting pipe and a lower joint, and the upper assembly joint, the connecting pipe and the lower joint are fixedly connected in sequence from top to bottom; the upper assembly joint comprises an upper short joint, a sealing ring and a clamp spring A; go up short circuit outer fringe face upper portion processing and have the slot, installation jump ring A in the slot, the sealing ring is installed between last short circuit boss's up end and jump ring A.
The sealing ring is the loop configuration, and the sealing ring lower extreme supports to lean on the up end of last short circuit boss, and the sealing ring upper end supports to lean on at jump ring A lower extreme.
In addition, still include sealing washer A, sealing washer B, installation sealing washer A between sealing ring inner edge face and the last short circuit outer edge face, sealing ring outer edge face processing has the sealing washer slot, places sealing washer B in the sealing washer slot, and sealing washer B is the chevron seal circle. The outer edge surface of the sealing ring is provided with a guide ring groove, and a guide ring is placed in the groove.
The lower end of the connecting pipe is in threaded connection with the upper end of the lower connector. A centralizer is arranged between the outer pipe and the inner pipe, and a pore passage communicated with fluid up and down is processed on the centralizer.
The invention has the advantages that firstly, the plug-in sealing male plug adopts a split structure, the sealing ring has certain aligning and aligning capability, and when the sealing groove is repaired or the sealing ring is replaced, the sealing ring can be independently disassembled or replaced, thereby saving time and labor; the sealing ring is small in size and can be subjected to surface treatment independently, so that the reliability of plug-in sealing is improved; and thirdly, the O-shaped ring is replaced by the mountain-shaped sealing ring, so that the overturning and contusion probability of the sealing ring is reduced.
Drawings
FIG. 1 is a schematic structural view of a double-walled drill pipe of the present invention.
Fig. 2 is a schematic view of a double-walled drill pipe according to the present invention in connection with the structure.
In the figure: 1. the outer pipe, 2, the inner pipe, 3, clamp springs B, 4, a centralizer, 20, an upper assembly joint, 21, a connecting pipe, 22, a lower joint, 23, an annular gap, 24, a through hole, 40, a hole channel, 200, an upper short circuit, 201, a hole channel, 202, sealing rings B and 203, sealing rings A and 204, a guide ring, 205, clamp springs A and 206 and a sealing ring.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
referring to fig. 1, a double-walled drill pipe includes an outer pipe 1 and an inner pipe 2. The upper end of the outer tube 1 is provided with an internal thread, the lower end of the outer tube is provided with an external thread and is provided with a central hole, and the upper end of the central hole is provided with an enlarged step hole. An axial through hole 24 is formed in the inner pipe 2, and an enlarged stepped hole is formed in the lower end of the through hole 24; the inner pipe 2 consists of an upper assembly joint 20, a connecting pipe 21 and a lower joint 22; the upper assembly joint 20 comprises an upper short circuit 200, a sealing ring 206, a sealing ring A203, a sealing ring B202 and a clamp spring A205; the upper short joint 200 is in a circular tube shape, and an axial through hole is formed in the upper short joint.
The upper portion of the outer edge face of the upper short circuit 200 is provided with a groove, a clamp spring A205 is installed in the groove, and the middle portion of the outer edge face is provided with an outward boss. The sealing ring 206 is of an annular structure, and the sealing ring 206 is installed between the upper end face of the boss of the upper short circuit 200 and the clamp spring A205. The lower end of the sealing ring 206 abuts against the upper end face of the boss of the upper short circuit 200, and the upper end of the sealing ring 206 abuts against the lower end of the clamp spring A205, so that the sealing ring 206 is prevented from being disengaged upwards or downwards relative to the upper short circuit 200.
A sealing ring A203 is arranged between the inner edge surface of the sealing ring 206 and the outer edge surface of the upper short circuit 200, and the sealing ring A203 is an O-shaped sealing ring; 2 sealing ring grooves are processed on the outer edge surface of the sealing ring 206, a sealing ring B202 is placed in each sealing ring groove, and each sealing ring B202 is a mountain-shaped sealing ring. A guide ring groove is processed on the outer edge surface of the seal ring 206 and the upper part of the 2 seal ring grooves, and a guide ring 204 is placed in the guide ring groove and used for righting the inner pipe when a drill rod is connected, so that the reliability of the seal ring B202 is improved.
The connecting pipe 21 and the lower joint 22 are both in a circular pipe shape, the connecting pipe 21, the lower joint 22 and the lower joint 22 are sequentially and fixedly connected together from top to bottom, and the axial through hole 24 penetrates through the connecting pipe 21, the lower joint 22 and the lower joint 22. The lower end of an upper short circuit 200 of the upper assembly joint is welded with the upper end of a connecting pipe 21, and the lower end of the connecting pipe 21 is welded with a lower joint 22; the lower end of the connecting pipe 21 and the upper end of the lower joint 22 can be connected by screw threads.
The inner pipe 2 is inserted into the central hole of the outer pipe 1 from the upper part of the outer pipe 1, and the lower end face of the boss of the upper short joint 200 abuts against the step hole at the upper end of the central hole of the outer pipe 1; a clamp spring groove is processed in the upper portion of a stepped hole of the outer pipe 1, a clamp spring B3 is placed in the clamp spring groove, the upper end face of a boss of the upper short circuit 200 abuts against the lower end of a clamp spring B3, and the clamp spring B3 prevents the inner pipe 2 from being separated upwards relative to the outer pipe 1. An annular gap 23 is formed among the connecting pipe 21, the lower connector 22 and the central hole of the outer pipe 1, an axial pore channel 201 is axially processed on a boss of the upper short joint 200, and the pore channel 201 and the annular gap 23 form a first fluid channel; the through-hole 24 forms a second fluid passage; a centralizer 4 is arranged between the outer pipe 1 and the inner pipe 2, and a pore passage 40 which is communicated with fluid up and down is processed on the centralizer.
Referring to fig. 2, when two double-wall drill pipes are connected, a first double-wall drill pipe is arranged on the upper portion, a second double-wall drill pipe is arranged on the lower portion, external threads at the lower end of an outer pipe of the first double-wall drill pipe are connected with internal threads at the upper end of an outer pipe of the second double-wall drill pipe, a sealing ring 206 of an assembly joint 20 on the second double-wall drill pipe is inserted into the bottom of a lower joint 22 of the first double-wall drill pipe and enters a stepped hole of a through hole 24, first fluid passages of the two double-wall drill pipes are communicated, a second fluid passage of the two double-wall drill pipes is communicated, and a sealing ring B is arranged between the outer edge surface of the sealing ring 206 on the second double-wall drill pipe and the inner.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A double-walled drill rod comprising an outer tube (1) and an inner tube (2), characterized in that: the outer pipe (1) is provided with a central hole, and the inner pipe (2) is inserted into the central hole of the outer pipe (1) and fixed in the outer pipe (1); the inner pipe (2) is provided with an axial through hole (24), and the lower end of the through hole (24) is provided with a step hole; the middle part of the outer edge surface of the inner tube (2) is provided with an outward boss, the boss of the inner tube (2) is fixed on the central hole of the outer tube (1), an annular gap (23) is formed between the inner tube (2) and the central hole of the outer tube (1), and an axial pore passage (201) is axially processed on the boss of the inner tube (2).
2. A double-walled drill rod according to claim 1 wherein: an enlarged stepped hole is formed in the upper end of the central hole of the outer pipe (1); a snap spring groove is processed in the step hole at the central hole end of the outer tube (1), a snap spring B (3) is placed in the snap spring groove, and the boss of the inner tube (2) is fixed on the step hole of the outer tube (1) through the snap spring B (3).
3. A double-walled drill rod according to claim 1 or 2, wherein: the inner pipe (2) consists of an upper assembly joint (20), a connecting pipe (21) and a lower joint (22), and the upper assembly joint (20), the connecting pipe (21) and the lower joint (22) are fixedly connected in sequence from top to bottom; the upper assembly joint (20) comprises an upper short circuit (200), a sealing ring (206) and a clamp spring A (205); a groove is processed in the upper portion of the outer edge face of the upper short circuit (200), a clamp spring A (205) is installed in the groove, and a sealing ring (206) is installed between the upper end face of the boss of the upper short circuit (200) and the clamp spring A (205).
4. A double-walled drill rod according to claim 3 wherein: sealing ring (206) are the loop configuration, and sealing ring (206) lower extreme supports and leans on last short circuit (200) the up end of boss, and sealing ring (206) upper end supports and leans on at jump ring A (205) lower extreme.
5. A double-walled drill rod according to claim 4 wherein: still include sealing washer A (203), sealing washer B (202), installation sealing washer A (203) between sealing washer (206) inner edge face and last short circuit (200) outer edge face, sealing washer (206) outer edge face processing has the sealing washer slot, places sealing washer B (202) in the sealing washer slot.
6. A double-walled drill rod according to claim 3 wherein: the outer edge surface of the sealing ring (206) is provided with a guide ring groove, and the guide ring (204) is arranged in the groove.
7. A double-walled drill rod according to claim 5 wherein: the seal ring B (202) is a chevron seal ring.
8. A double-walled drill rod according to claim 3 wherein: the lower end of the connecting pipe (21) is in threaded connection with the upper end of the lower joint (22).
9. A double-walled drill rod according to claim 1 wherein: a centralizer (4) is arranged between the outer pipe (1) and the inner pipe (2), and a pore passage (40) communicated with fluid up and down is processed on the centralizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910203553.XA CN111706266B (en) | 2019-03-18 | 2019-03-18 | Double-wall drill rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910203553.XA CN111706266B (en) | 2019-03-18 | 2019-03-18 | Double-wall drill rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111706266A true CN111706266A (en) | 2020-09-25 |
| CN111706266B CN111706266B (en) | 2024-09-17 |
Family
ID=72536341
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910203553.XA Active CN111706266B (en) | 2019-03-18 | 2019-03-18 | Double-wall drill rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111706266B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004353357A (en) * | 2003-05-30 | 2004-12-16 | Nittoc Constr Co Ltd | Double-walled pipe drilling equipment |
| CN201090144Y (en) * | 2007-09-12 | 2008-07-23 | 辽河石油勘探局 | Inclined plane jack-in type closing joint connecting inner tube |
| CN101655003A (en) * | 2009-09-26 | 2010-02-24 | 姬振河 | Air drilling double-wall drill rod |
| CN204754797U (en) * | 2015-05-15 | 2015-11-11 | 中国地质科学院勘探技术研究所 | Long -life double -walled drilling rod |
| CN210977313U (en) * | 2019-03-18 | 2020-07-10 | 中石化石油工程技术服务有限公司 | Double-wall drill rod |
-
2019
- 2019-03-18 CN CN201910203553.XA patent/CN111706266B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004353357A (en) * | 2003-05-30 | 2004-12-16 | Nittoc Constr Co Ltd | Double-walled pipe drilling equipment |
| CN201090144Y (en) * | 2007-09-12 | 2008-07-23 | 辽河石油勘探局 | Inclined plane jack-in type closing joint connecting inner tube |
| CN101655003A (en) * | 2009-09-26 | 2010-02-24 | 姬振河 | Air drilling double-wall drill rod |
| CN204754797U (en) * | 2015-05-15 | 2015-11-11 | 中国地质科学院勘探技术研究所 | Long -life double -walled drilling rod |
| CN210977313U (en) * | 2019-03-18 | 2020-07-10 | 中石化石油工程技术服务有限公司 | Double-wall drill rod |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111706266B (en) | 2024-09-17 |
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