CN107816326B - Double-wall reverse circulation drilling tool - Google Patents
Double-wall reverse circulation drilling tool Download PDFInfo
- Publication number
- CN107816326B CN107816326B CN201710995067.7A CN201710995067A CN107816326B CN 107816326 B CN107816326 B CN 107816326B CN 201710995067 A CN201710995067 A CN 201710995067A CN 107816326 B CN107816326 B CN 107816326B
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- Prior art keywords
- rotor
- inner cavity
- drill bit
- double
- connector
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- 238000005553 drilling Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 239000011435 rock Substances 0.000 abstract description 16
- 239000012530 fluid Substances 0.000 abstract description 13
- 238000005516 engineering process Methods 0.000 abstract description 6
- 238000004140 cleaning Methods 0.000 abstract description 4
- 238000011010 flushing procedure Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/12—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using drilling pipes with plural fluid passages, e.g. closed circulation systems
-
- 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
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
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 relates to a double-wall reverse circulation drilling tool used in the field of oil and gas drilling engineering. The drilling tool meets the requirements of a double-wall drill rod reverse circulation drilling technology, and simultaneously improves the cleaning efficiency of the rock debris at the bottom of the well. The technical characteristics are as follows: the upper end of the outer cylinder body is connected with the lower end of the upper connector through screw threads, and the lower end of the outer cylinder body is connected with the upper end of the connector through screw threads; the thrust bearing is arranged on the surface of a step in the middle of the inner cavity of the connector; the middle part of the outer circle of the outer rotor is provided with a left-handed spiral blade, and the outer circle of the inner rotor is provided with a right-handed spiral blade; the outer rotor is arranged in the inner cavity of the outer cylinder body; the inner rotor is arranged in an inner cavity of the outer rotor, male threads at the lower end of the inner rotor are in threaded connection with female threads at the bottom of a stepped hole of an inner cavity of the jet flow drill bit, and male threads at the lower end of the outer rotor are in threaded connection with female threads at an orifice of the stepped hole of the inner cavity of the jet flow drill bit. The invention realizes that the drilling fluid and the rock debris directly enter the inner cavity of the outer rotor from the direct backflow hole of the jet flow drill bit and further enter the inner pipe of the double-wall drill rod, the rock breaking torque is large, the rock debris at the shaft bottom can be cleaned in time, and the rock cleaning efficiency at the shaft bottom is high.
Description
Technical Field
The invention relates to a double-wall reverse circulation drilling tool used in the field of oil and gas drilling engineering.
Background
In the field of oil and gas drilling engineering, a double-wall drill rod reverse circulation drilling (Reel Well drilling) technology is used as a new drilling technology, the double-wall drill rod is used as a base, drilling fluid is pumped into a Well from the annulus of the double-wall drill rod and cleans the bottom of the Well, and rock debris is carried in an inner drill rod and returns to the ground, so that the closed-loop circulation of the drilling fluid is realized. The double-wall drill rod consists of an inner layer of drill rod and an outer layer of drill rod (called an inner pipe and an outer pipe); an annular space is formed between the inner pipe and the outer pipe, and is a channel for pumping flushing medium to the bottom of the hole when hydraulic rock conveying drilling and central sampling drilling are carried out; the central hole of the inner pipe is fixed into a whole by discharging flushing medium, each double-wall drill rod is connected by the screw thread of the outer pipe to ensure the transmission of torque and pressure, the inner pipes are connected in an inserting mode, generally only play a role in circulating the flushing medium, and a sealing device is arranged at the inserting position.
The double-wall drill rod reverse circulation drilling technology has great advantages in the aspects of pressure control drilling, large displacement drilling, deepwater drilling and pressure challenging stratum drilling, and mainly has the following characteristics: (1) the drilling fluid reversely circulates in the pipe-in-pipe to realize drilling without a riser; (2) the double-wall drill pipe serves as a power and data transmission channel; (3) and the whole process of pressure control drilling is realized. In the application process of the conventional double-wall drill rod reverse circulation drilling technology, drilling fluid enters an inner pipe of the double-wall drill rod from a flowing conversion joint at the upper part of a bottom drilling assembly, so that the pressure difference of the drilling fluid from a drill bit to the flowing conversion joint at the upper part is large, the rock debris carrying efficiency is low, and the rock debris at the bottom of a well is difficult to remove in time. Based on the technical background, the invention particularly provides a double-wall reverse circulation drilling tool.
Disclosure of Invention
The purpose of the invention is: in order to meet the requirements of double-wall drill rod reverse circulation drilling technology and improve the cleaning efficiency of rock debris at the bottom of a well, the double-wall reverse circulation drilling tool is provided.
In order to achieve the purpose, the invention adopts the following technical scheme: a double-wall reverse circulation well drilling tool is composed of an upper joint, an outer cylinder, an outer rotor, an inner rotor, a connector, a thrust bearing and a jet drill bit; the structure is characterized in that: the upper end of the upper connector is connected with the outer cylinder of the double-wall drill rod through a screw thread, and the upper end of the outer rotor is hermetically inserted into the inner cylinder of the double-wall drill rod; the upper end of the outer cylinder body is connected with the lower end of the upper connector through screw threads, and the lower end of the outer cylinder body is connected with the upper end of the connector through screw threads; a circle of raised steps are arranged at the upper part of the inner cavity of the outer cylinder body; a circle of step surface is arranged in the middle of the inner cavity of the connector, and four overflowing holes b are uniformly arranged in the circumferential direction of the upper part of the connector; the thrust bearing is arranged on the surface of a step in the middle of the inner cavity of the connector; the upper part of the outer circle of the outer rotor is provided with a circle of raised steps, twelve overflowing holes a are uniformly formed in the raised steps, the middle part of the outer circle of the outer rotor is provided with a left-handed spiral blade, and the lower end of the outer circle of the outer rotor is provided with male threads; the outer circle of the inner rotor is provided with a right-handed spiral blade, and the lower end of the outer circle of the inner rotor is provided with male threads; the inner cavity of the jet drill bit is provided with a stepped hole, the orifice of the stepped hole is provided with female threads, the bottom of the stepped hole is provided with female threads, the jet drill bit is uniformly provided with three jet holes in the circumferential direction to communicate the upper end surface and the lower end surface of the jet drill bit, and the jet drill bit is uniformly provided with three backflow holes in the circumferential direction to communicate the excircle of the jet drill bit and the middle part of the stepped hole of the inner cavity; the outer rotor is arranged in the inner cavity of the outer cylinder, and the raised steps on the upper part of the outer circle of the outer rotor are arranged on the raised steps on the upper part of the inner cavity of the outer cylinder; the inner rotor is arranged in an inner cavity of the outer rotor, male threads at the lower end of the inner rotor are in threaded connection with female threads at the bottom of a stepped hole of an inner cavity of the jet flow drill bit, and male threads at the lower end of the outer rotor are in threaded connection with female threads at an orifice of the stepped hole of the inner cavity of the jet flow drill bit.
The invention has the beneficial effects that: (1) according to the invention, drilling fluid and rock debris directly enter the inner cavity of the outer rotor from the direct backflow hole of the jet flow drill bit and further enter the inner pipe of the double-wall drill rod, so that the rock debris at the bottom of the well can be cleaned in time, and the rock cleaning efficiency at the bottom of the well is high; (2) the jet flow drill bit is driven by the outer rotor and the inner rotor together, and the rock breaking torque is large; (3) the invention realizes the underground power driving of the double-wall drill rod reverse circulation well drilling, the driving component has no rubber structure, and the invention is suitable for the high-temperature and high-pressure environment of the deep well.
Drawings
FIG. 1 is a schematic diagram of a double-walled reverse circulation well tool of the present invention.
Fig. 2 is a cross-sectional view of fig. 1A-a.
Fig. 3 is a three-dimensional structure diagram of the outer rotor.
Fig. 4 is a schematic three-dimensional structure of the inner rotor.
In the figure: 1. the jet flow drill comprises an upper joint, an outer cylinder body 2, an outer rotor 3, an inner rotor 4, a connector 5, a thrust bearing 6, a jet flow drill bit 7, an overflowing hole a31, a left-hand spiral blade 32, a right-hand spiral blade 41, an overflowing hole b51, a jet flow hole 71 and a backflow hole 72.
Detailed Description
As shown in figure 1, the invention relates to a double-wall reverse circulation drilling tool, which consists of an upper joint 1, an outer cylinder 2, an outer rotor 3, an inner rotor 4, a connector 5, a thrust bearing 6 and a jet drill bit 7; the structure is characterized in that: the upper end of the upper connector 1 is connected with the outer cylinder of the double-wall drill rod through a screw thread, and the upper end of the outer rotor 3 is hermetically inserted into the inner cylinder of the double-wall drill rod; the upper end of the outer cylinder 2 is connected with the lower end of the upper joint 1 through a screw thread, and the lower end of the outer cylinder 2 is connected with the upper end of the connector 5 through a screw thread; a circle of raised steps are arranged at the upper part of the inner cavity of the outer cylinder body 2; a circle of step surfaces are arranged in the middle of an inner cavity of the connector 5, and four overflowing holes b51 are uniformly formed in the circumferential direction of the upper part of the connector 5; the thrust bearing 6 is arranged on the surface of a step in the middle of the inner cavity of the connector 5; the inner cavity of the jet drill bit 7 is provided with a stepped hole, the orifice of the stepped hole is provided with female threads, and the bottom of the stepped hole is provided with female threads, as shown in fig. 2, the jet drill bit 7 is uniformly provided with three jet holes 71 in the circumferential direction to communicate the upper end surface and the lower end surface of the jet drill bit 7, and the jet drill bit 7 is uniformly provided with three return holes 72 in the circumferential direction to communicate the outer circle of the jet drill bit 7 and the middle part of the stepped hole; the outer rotor 3 is arranged in the inner cavity of the outer cylinder 2, and the raised steps on the upper part of the outer circle of the outer rotor 3 are arranged on the raised steps on the upper part of the inner cavity of the outer cylinder 2; the inner rotor 4 is arranged in the inner cavity of the outer rotor 3, the male thread at the lower end of the inner rotor 4 is in threaded connection with the female thread at the bottom of the stepped hole of the inner cavity of the jet flow drill bit 7, and the male thread at the lower end of the outer rotor 3 is in threaded connection with the female thread at the hole opening of the stepped hole of the inner cavity of the jet flow drill bit 7.
As shown in fig. 3, a circle of raised steps are arranged on the upper part of the outer circle of the outer rotor 3, twelve through-flow holes a31 are uniformly arranged on the raised steps, a left-handed helical blade 32 is arranged in the middle of the outer circle of the outer rotor 3, and male threads are arranged at the lower end of the outer circle of the outer rotor 3.
As shown in fig. 4, a right-handed helical blade 41 is arranged on the outer circle of the inner rotor 4, and a male thread is arranged at the lower end of the outer circle of the inner rotor 4.
The working principle of the double-wall reverse circulation drilling tool provided by the invention is as follows: the drilling fluid enters the bottom of the well, the pump is started to circulate the drilling fluid, the drilling fluid enters the annular space between the outer rotor 3 and the outer cylinder 2 from the annular space between the outer cylinder and the inner cylinder of the double-wall drill rod, the drilling fluid drives the outer rotor 3 to rotate forwards under the action of the left-handed helical blade 32, the drilling fluid enters a borehole through the jet hole 71 of the jet drill bit 7 to carry rock debris and enters the annular space between the outer rotor 3 and the inner rotor 4 through the backflow hole 72, and the drilling fluid drives the inner rotor 4 to rotate forwards under the action of the right-. The jet drill bit 7 breaks rock positively under the combined action of the outer rotor 3 and the inner rotor 4.
Claims (2)
1. A double-wall reverse circulation well drilling tool is composed of an upper joint (1), an outer cylinder body (2), an outer rotor (3), an inner rotor (4), a connector (5), a thrust bearing (6) and a jet drill bit (7); the method is characterized in that: the upper end of the upper connector (1) is connected with the outer cylinder of the double-wall drill rod through screw threads, and the upper end of the outer rotor (3) is in sealed insertion connection with the inner cylinder of the double-wall drill rod; the upper end of the outer cylinder (2) is connected with the lower end of the upper joint (1) through a screw thread, and the lower end of the outer cylinder (2) is connected with the upper end of the connector (5) through a screw thread; a circle of raised steps are arranged at the upper part of the inner cavity of the outer cylinder body (2); a circle of step surfaces are arranged in the middle of an inner cavity of the connector (5), and four overflowing holes b (51) are uniformly arranged in the circumferential direction of the upper part of the connector (5); the thrust bearing (6) is arranged on the surface of a step in the middle of the inner cavity of the connector (5); a circle of raised steps are arranged at the upper part of the outer circle of the outer rotor (3), twelve overflowing holes a (31) are uniformly formed in the raised steps, a left-handed helical blade (32) is arranged in the middle of the outer circle of the outer rotor (3), and male threads are arranged at the lower end of the outer circle of the outer rotor (3); the outer circle of the inner rotor (4) is provided with a right-handed spiral blade (41), and the lower end of the outer circle of the inner rotor (4) is provided with male threads; the outer rotor (3) is arranged in the inner cavity of the outer cylinder body (2), and the raised steps at the upper part of the excircle of the outer rotor (3) are arranged on the raised steps at the upper part of the inner cavity of the outer cylinder body (2); the inner rotor (4) is arranged in the inner cavity of the outer rotor (3), the male thread at the lower end of the inner rotor (4) is in threaded connection with the female thread at the bottom of the stepped hole of the inner cavity of the jet flow drill bit (7), and the male thread at the lower end of the outer rotor (3) is in threaded connection with the female thread at the hole opening of the stepped hole of the inner cavity of the jet flow drill bit (7).
2. The double-walled reverse circulation drilling tool of claim 1, wherein: the jet flow drill bit (7) inner chamber sets up to the step hole, and the step hole drill way mouth sets up to female screw thread, and the step hole bottom sets up to female screw thread, and jet flow drill bit (7) circumference evenly sets up three jet hole (71) intercommunication jet flow drill bit (7) up end and terminal surface down, and jet flow drill bit (7) circumference evenly sets up three backward flow hole (72) intercommunication jet flow drill bit (7) excircle and inner chamber step hole middle part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710995067.7A CN107816326B (en) | 2017-10-23 | 2017-10-23 | Double-wall reverse circulation drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710995067.7A CN107816326B (en) | 2017-10-23 | 2017-10-23 | Double-wall reverse circulation drilling tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107816326A CN107816326A (en) | 2018-03-20 |
| CN107816326B true CN107816326B (en) | 2019-12-20 |
Family
ID=61608396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710995067.7A Active CN107816326B (en) | 2017-10-23 | 2017-10-23 | Double-wall reverse circulation drilling tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107816326B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108425651A (en) * | 2018-05-21 | 2018-08-21 | 广州海洋地质调查局 | It is a kind of for deep water without marine riser gas lift reverse circulation drilling well system and method |
| CN115234186B (en) * | 2022-08-12 | 2024-02-27 | 中国铁建重工集团股份有限公司 | Combined coring drilling machine and working method thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3583502A (en) * | 1968-07-29 | 1971-06-08 | Homer I Henderson | Axial flow turbine drill for earth boring |
| CN201582135U (en) * | 2009-12-29 | 2010-09-15 | 中国石油集团西部钻探工程有限公司吐哈钻井工艺研究院 | Centralizing pumping screw turbine pump for underground annuluses |
| CN201818235U (en) * | 2010-09-17 | 2011-05-04 | 盐城市大冈石油工具厂有限责任公司 | Reverse rotary screw drilling tool |
| NO345900B1 (en) * | 2013-05-23 | 2021-10-04 | Halliburton Energy Services Inc | Downhole drilling motor and method of use |
| CN103982134B (en) * | 2014-05-28 | 2016-01-20 | 西南石油大学 | A kind of reverse circulation drilling well tool |
| CN104120971B (en) * | 2014-06-27 | 2016-01-20 | 西南石油大学 | A kind of torsion generator that unidirectional impact is provided |
| CN105239935B (en) * | 2015-09-18 | 2017-04-05 | 西南石油大学 | A kind of drilling in coal is with spiral counterflush drilling instrument |
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2017
- 2017-10-23 CN CN201710995067.7A patent/CN107816326B/en active Active
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| CN107816326A (en) | 2018-03-20 |
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Effective date of registration: 20201229 Address after: 102200 423, 4 / F, block a, Xinhua future city building, 175 Litang Road, Changping District, Beijing Patentee after: Li Qiannan Address before: 610039, No. 999, Jin Zhou road, Jinniu District, Sichuan, Chengdu Patentee before: XIHUA University |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210128 Address after: 062450 Yingzhou Economic Development Zone, Hejian City, Cangzhou City, Hebei Province Patentee after: CANGZHOU GREAT DRILL Co.,Ltd. Address before: 102200 423, 4 / F, block a, Xinhua future city building, 175 Litang Road, Changping District, Beijing Patentee before: Li Qiannan |