CN113802978A - Special horizontal well diameter-adjustable screw drilling tool for coal bed gas - Google Patents
Special horizontal well diameter-adjustable screw drilling tool for coal bed gas Download PDFInfo
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- CN113802978A CN113802978A CN202111210985.7A CN202111210985A CN113802978A CN 113802978 A CN113802978 A CN 113802978A CN 202111210985 A CN202111210985 A CN 202111210985A CN 113802978 A CN113802978 A CN 113802978A
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- piston
- shaft assembly
- elliptical
- assembly
- transmission shaft
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- 238000005553 drilling Methods 0.000 title claims abstract description 41
- 239000003245 coal Substances 0.000 title claims abstract description 24
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 238000003801 milling Methods 0.000 claims abstract description 17
- 230000007704 transition Effects 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 238000009434 installation Methods 0.000 abstract 2
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
Images
Classifications
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- 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/02—Fluid rotary type drives
-
- 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
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/265—Bi-center drill bits, i.e. an integral bit and eccentric reamer used to simultaneously drill and underream the hole
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- 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
- E21B10/26—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
- E21B10/32—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
- E21B10/322—Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools cutter shifted by fluid pressure
-
- 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
- E21B29/00—Cutting or destroying pipes, packers, plugs or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
-
- 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/003—Bearing, sealing, lubricating details
-
- 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/006—Mechanical motion converting means, e.g. reduction gearings
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a special horizontal well diameter-adjustable screw drilling tool for coal bed gas, which can increase the drilling hole diameter and comprises: the lower end of the transmission shaft assembly is connected with a reducing piston assembly, and the lower end of the reducing piston assembly is connected with a milling shoe through a transition joint; the reducing piston assembly comprises: t type piston rod, piston clamp plate, reset spring and clamp plate fixing bolt the upper end of T type piston rod is provided with the oval piston, the lower extreme of oval piston is provided with the inclined plane the lower extreme of transmission shaft assembly is provided with the oval annular space inner chamber of mutually supporting with the oval piston, the oval piston passes through piston clamp plate and clamp plate fixing bolt spacing in oval annular space inner chamber there is the spring installation chamber in the piston clamp plate, reset spring sets up in the spring installation chamber.
Description
Technical Field
The invention relates to the technical field of screw drilling tools, in particular to a horizontal well diameter-adjustable screw drilling tool special for coal bed gas.
Background
Along with the continuous deepening of oil gas exploration and exploitation work, the difficulty of conventional oil gas resource supply guarantee is increased, the development of unconventional oil gas resources is accelerated, the oil gas yield is increased, the life cycle of the petroleum industry is prolonged, meanwhile, multi-way supply can be provided for oil gas in China, and the method has important significance in improving the medium-term and long-term oil gas guarantee in China. Unconventional oil and gas resources mainly comprise compact rock oil and gas, shale oil and coal bed gas, and are widely distributed and large in reserve in China, wherein the most important is the exploitation of the coal bed gas. The traditional coal bed gas exploitation mode is vertical well exploitation, the yield is low, the benefit is poor, and the current common yield increasing measure is horizontal well drilling exploitation. The characteristics of the coal bed gas reservoir are greatly different from those of the conventional energy reservoir, the coal bed gas reservoir mainly comprises shale, sandstone and limestone, the stress is high, the change of water saturation is large, the rock stratum is uneven in hardness, and due to expansion and stress release when the coal bed gas is drilled, the stratum and the well wall are often unstable, the drilled hole is deviated, the well wall is narrowed, and even collapses, so that the drilling diameter needs to be corrected and adjusted at any time when the coal bed gas is drilled. The screw drilling tool is a power machine commonly used for coal bed gas horizontal drilling, is a cavity displacement type hydraulic machine, takes liquid as a power medium, does not rotate during drilling and is used as a channel and a support for conveying pressure working medium, a drill bit at the lower end of a transmission shaft rotates to convert liquid pressure into mechanical energy, and horizontal drilling of the screw drilling tool is a key technology in the field of coal bed gas drilling engineering. However, when the drilling is deviated and the well wall is expanded and narrowed, and the operation index cannot be completed, the drilling aperture cannot be adjusted at any time, the drilling tool is required to be lifted out to replace the drill bit, the workload is increased, the operation efficiency is low, and underground accidents are easy to occur. The market needs a screw drill which can adjust the drilling aperture at any time when the coal bed gas horizontal well is drilled.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the special horizontal well diameter-adjustable screw drilling tool for the coal bed gas can increase the drilling hole diameter.
In order to solve the technical problems, the invention adopts the technical scheme that: special adjustable footpath screw rod drilling tool of horizontal well of coal bed gas includes: the lower end of the liquid inlet joint is connected with the hydraulic motor assembly, the lower end of the hydraulic motor assembly is connected with the universal shaft assembly, the lower end of the universal shaft assembly is connected with the transmission shaft assembly, the lower end of the transmission shaft assembly is connected with a variable diameter piston assembly, and the lower end of the variable diameter piston assembly is connected with a milling shoe through a transition joint; the reducing piston assembly comprises: the upper end of the T-shaped piston rod is provided with an elliptical piston, the lower end of the elliptical piston is provided with an inclined surface, the lower end of the transmission shaft assembly is provided with an elliptical annular inner cavity matched with the elliptical piston, the elliptical piston is limited in the elliptical annular inner cavity through the piston pressing plate and the pressing plate fixing bolt, a spring mounting cavity is arranged in the piston pressing plate, the reset spring is arranged in the spring mounting cavity, the upper end of the reset spring is abutted against the inclined surface at the lower end of the elliptical piston, the lower end of the reset spring is abutted against the piston pressing plate, the included angle between the inclined surface and the upper end plane of the piston pressing plate is 1-3 degrees, a sealing ring is arranged between the elliptical piston and the inner wall at the lower end of the transmission shaft assembly, and the T-shaped piston rod is internally provided with a water guide hole, the upper end of the water guide hole is arranged in the elliptical piston in a conical shape.
In order to better solve the technical problems, the invention adopts the further technical scheme that: the sealing ring is two O-shaped sealing rings.
The invention has the advantages that: when the special diameter-adjustable screw drilling tool for coal bed gas is used for horizontal drilling, when drilling to a complex stratum which is easy to deflect and has large expansion and narrowing of a well wall is carried out, the drilling hole diameter needs to be adjusted and increased, the large-size milling shoe does not need to be lifted and drilled, the ground pressure can be adjusted under the condition of no lifting, the underground milling shoe deflects on the elliptical piston, the rotating radius of the milling shoe connected with the elliptic piston is increased, and the drilling hole diameter is increased. Meanwhile, the ground pressure is increased, the rotating power of the milling shoe is increased, and when the drilling hole diameter is increased and the specification of a drilling tool is unchanged, the sufficient milling efficiency of the milling shoe can be still met, and the drilling task is smoothly completed. When the complex stratum passes drilling, the milling shoe is replaced without tripping the drilling tool, only the pressure of the well fluid on the ground is reduced to normal pressure, the elliptical piston is reset under the action of the reset spring, the drilling hole diameter is restored to the normal design requirement, the operation is simple and convenient, and the diameter changing is flexible, reliable and safe.
Drawings
Fig. 1 is a schematic structural diagram of the upper half section of the horizontal well diameter-adjustable screw drill special for coal bed gas.
FIG. 2 is a schematic structural diagram of the lower half section of the horizontal well diameter-adjustable screw drill special for coal bed methane.
Fig. 3 is an enlarged schematic view of a portion a in fig. 2.
FIG. 4 is a schematic sectional view of B-B in FIG. 3.
In the figure: 1. the hydraulic control system comprises a liquid inlet joint, 2, a hydraulic motor assembly, 3, a universal shaft assembly, 4, a transmission shaft assembly, 41, an oval annular inner cavity, 5, a transition joint, 6, a milling shoe, 71, a T-shaped piston rod, 711, an oval piston, 712, an inclined plane, 72, a piston pressing plate, 73, a return spring, 74, a pressing plate fixing bolt, 75, a spring mounting cavity, 76, a sealing ring, 77, a water guide hole, 78 and a pressurizing cavity.
Detailed Description
The details of the present invention are described below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, 2, 3 and 4, the horizontal well adjustable-diameter screw drill special for coal bed methane comprises: the liquid inlet joint comprises a liquid inlet joint 1, a hydraulic motor assembly 2, a universal shaft assembly 3 and a transmission shaft assembly 4, wherein the lower end of the liquid inlet joint 1 is connected with the hydraulic motor assembly 2, the lower end of the hydraulic motor assembly 2 is connected with the universal shaft assembly 3, the lower end of the universal shaft assembly 3 is connected with the transmission shaft assembly 4, the lower end of the transmission shaft assembly 4 is connected with a reducing piston assembly, and the lower end of the reducing piston assembly is connected with a milling shoe 6 through a transition joint 5; the reducing piston assembly comprises: the upper end of the T-shaped piston rod 71 is provided with an elliptical piston 711, the lower end of the elliptical piston 711 is provided with an inclined surface 712, the lower end of the transmission shaft assembly 4 is provided with an elliptical annular inner cavity 41 which is matched with the elliptical piston 711, the elliptical piston 711 is limited in the elliptical annular inner cavity 41 through the piston pressing plate 72 and the pressing plate fixing bolt 74, the piston pressing plate 72 is internally provided with a spring mounting cavity 75, the return spring 73 is arranged in the spring mounting cavity 75, the upper end of the return spring 73 is abutted against the inclined surface 712 at the lower end of the elliptical piston 711, the lower end of the return spring 73 is abutted against the piston pressing plate 72, the included angle between the inclined surface 712 and the upper end plane of the piston pressing plate 72 is 1-3 degrees, and a sealing ring 76 is arranged between the elliptical piston 711 and the inner wall at the lower end of the transmission shaft assembly 4, a water guide hole 77 is formed in the T-shaped piston rod 71, and an upper end of the water guide hole 77 is tapered and disposed inside the elliptical piston 711.
The diameter-adjustable screw drilling tool for the horizontal well special for coal bed gas is arranged on a diameter-adjustable piston assembly, a connecting cavity at the lower end of a transmission shaft assembly 4 is designed into an oval annular inner cavity 41, a T-shaped piston rod 71 matched with the oval annular inner cavity 41 is arranged in the oval annular inner cavity 41 to prevent the piston rod from rotating in the cavity during working, an inclined plane 712 is arranged at the lower end of an oval piston 711, an included angle between the inclined plane 712 and the upper end plane of a piston pressing plate 72 is 1-3 degrees and is a variable inclined plane angle during working, the diameter-adjustable piston assembly and a transition joint 5 are adopted to transmit power transmitted from the ground to a milling shoe 6, a water guide hole 77 is arranged in the T-shaped piston rod 71, the upper end of the water guide hole 77 is arranged in the oval piston 711 in a conical manner to ensure that throttling pressure is formed at the upper end plane of the oval piston 711 during working and upward thrust is formed in the oval piston 711 when the pressure is not applied, a sealing ring 76 is arranged between the outer side of the elliptical piston 711 and an elliptical annular matching surface of the transmission shaft assembly 4, and the sealing ring 76 can adopt two O-shaped sealing rings in the actual use process, so that side leakage is prevented during operation.
When the adjustable-diameter screw drilling tool for the horizontal well special for coal bed gas is used, the ground drilling liquid pressure is normally 2-3Mpa, the reset spring 73 cannot be compressed, the rotating central plane of the T-shaped piston rod 71 cannot form an inclined angle, the transmission shaft assembly 4 drives the milling shoe 6 to drill in a rotating mode through the reducing piston assembly and the transition joint 5, when the drilling hole needs to be enlarged in an easily inclined and expanded stratum, the elliptical piston 711 is pressed in the elliptical annular inner cavity 41 as long as the hydraulic power is increased to 5-7MPa on the ground, the pressure enters the pressurizing cavity 78 at the lower end of the transmission shaft assembly 4, the elastic force of the reset spring 73 is overcome to push downwards, the rotating central plane of the T-shaped piston rod 71 forms an inclined angle, and the rotating radius of the milling shoe 6 is increased, so that the purpose of enlarging the drilling hole diameter can be achieved. The larger the ground hydraulic power is, the more the return spring 73 contracts, the larger the deflection angle of the end face of the elliptical piston 711 is, the larger the rotation radius of the milling shoe 6 is, the larger the drilling hole diameter is, after the deflected expanded formation passes through drilling, the normal ground pressure is recovered, the T-shaped piston rod 71 is reset under the action of the return spring 73, the ground layer and the acting force, the drilling hole diameter is recovered to be normal, and the milling shoe 6 does not need to be frequently started and replaced.
Claims (2)
1. Special adjustable footpath screw rod drilling tool of horizontal well of coal bed gas includes: liquid inlet joint (1), hydraulic motor assembly (2), universal shaft assembly (3) and transmission shaft assembly (4), the lower extreme of liquid inlet joint (1) is connected with hydraulic motor assembly (2), the lower extreme of hydraulic motor assembly (2) is connected with universal shaft assembly (3), the lower extreme of universal shaft assembly (3) is connected its characterized in that with transmission shaft assembly (4): the lower end of the transmission shaft assembly (4) is connected with a reducing piston assembly, and the lower end of the reducing piston assembly is connected with a milling shoe (6) through a transition joint (5); the reducing piston assembly comprises: the transmission shaft assembly comprises a T-shaped piston rod (71), a piston pressing plate (72), a return spring (73) and a pressing plate fixing bolt (74), wherein an elliptical piston (711) is arranged at the upper end of the T-shaped piston rod (71), an inclined surface (712) is arranged at the lower end of the elliptical piston (711), an elliptical annular inner cavity (41) which is matched with the elliptical piston (711) is arranged at the lower end of the transmission shaft assembly (4), the elliptical piston (711) is limited in the elliptical annular inner cavity (41) through the piston pressing plate (72) and the pressing plate fixing bolt (74), a spring mounting cavity (75) is arranged in the piston pressing plate (72), the return spring (73) is arranged in the spring mounting cavity (75), the upper end of the return spring (73) is abutted against the inclined surface (712) at the lower end of the elliptical piston (711), and the lower end of the return spring (73) is abutted against the piston pressing plate (72), the included angle between the inclined plane (712) and the upper end plane of the piston pressing plate (72) is 1-3 degrees, a sealing ring (76) is arranged between the elliptical piston (711) and the inner wall of the lower end of the transmission shaft assembly (4), a water guide hole (77) is formed in the T-shaped piston rod (71), and the upper end of the water guide hole (77) is arranged in the elliptical piston (711) in a conical mode.
2. The special horizontal well diameter-adjustable screw drill for coal bed methane according to claim 1, characterized in that: the sealing ring (76) is two O-shaped sealing rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111210985.7A CN113802978A (en) | 2021-10-18 | 2021-10-18 | Special horizontal well diameter-adjustable screw drilling tool for coal bed gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111210985.7A CN113802978A (en) | 2021-10-18 | 2021-10-18 | Special horizontal well diameter-adjustable screw drilling tool for coal bed gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113802978A true CN113802978A (en) | 2021-12-17 |
Family
ID=78897846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111210985.7A Withdrawn CN113802978A (en) | 2021-10-18 | 2021-10-18 | Special horizontal well diameter-adjustable screw drilling tool for coal bed gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113802978A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117145379A (en) * | 2023-10-31 | 2023-12-01 | 长沙黑金刚实业有限公司 | Reverse circulation impactor |
-
2021
- 2021-10-18 CN CN202111210985.7A patent/CN113802978A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117145379A (en) * | 2023-10-31 | 2023-12-01 | 长沙黑金刚实业有限公司 | Reverse circulation impactor |
| CN117145379B (en) * | 2023-10-31 | 2024-01-30 | 长沙黑金刚实业有限公司 | Reverse circulation impactor |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20211217 |