CN111502590A - Reverse circulation drilling downhole plugging diverter - Google Patents
Reverse circulation drilling downhole plugging diverter Download PDFInfo
- Publication number
- CN111502590A CN111502590A CN201910095224.8A CN201910095224A CN111502590A CN 111502590 A CN111502590 A CN 111502590A CN 201910095224 A CN201910095224 A CN 201910095224A CN 111502590 A CN111502590 A CN 111502590A
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- Prior art keywords
- main shaft
- channel
- sealing ring
- processed
- drilling tool
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- 238000005553 drilling Methods 0.000 title claims abstract description 78
- 238000007789 sealing Methods 0.000 claims abstract description 27
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Earth Drilling (AREA)
Abstract
The invention discloses a reverse circulation drilling downhole plugging flow divider. The plugging diverter comprises a main shaft and a sealing ring; two raised circular steps are processed on the outer edge of the main shaft and respectively comprise a first step and a second step; the first step is located above the lateral channel, and the second step (29) is located above the first step; an axial groove which is axially parallel to the main shaft is processed on the outer edge of the first step; a circumferential groove which is vertical to the axial direction of the main shaft is processed on the outer edge of the second step; the sealing ring is mounted in the second step circumferential groove. The sealing ring can prevent the drilling medium on the lower part from returning to the upper part of the drilling tool, the sealing ring can be bent downwards when the drilling tool lifts, and a large well wall falling block can fall to the lower part of the plugging diverter through the sealing ring and the axial groove, so that the risk of drill sticking on the plugging diverter is reduced.
Description
Technical Field
The invention relates to the field of drilling tools, in particular to an underground blocking diverter for reverse circulation drilling.
Background
The method of drilling by circulating medium from bottom to top to surface with cuttings or core from the center of drill pipe is called reverse circulation center sampling drilling. Single, double or triple layer drill pipes are commonly used, but double wall drill pipes are most common. The circulating medium is pressed in by the annulus between the two pipes and returns from the center of the inner pipe carrying the rock debris (core), so the method is called double-pipe reverse circulation or double-wall drill pipe reverse circulation drilling. With the continuous innovation of the reverse circulation drilling theory and the drilling process, the reverse circulation drilling technology is more and more widely applied to the fields of mineral exploration, water well drilling, oil drilling and the like. The positive and negative alternative gas reverse circulation well drilling technology belongs to a form of reverse circulation well drilling, and compared with an oil drilling machine, the newly added equipment mainly comprises a gas box, a double-wall drill rod and an underground plugging diverter; the drilling tool structure generally comprises a water tap, a gas box, a double-wall drilling tool, an underground plugging diverter, a conventional drilling tool and a drill bit; during drilling, compressed air enters the annular gap of the double-wall drill rod through the air box and reaches the conventional drilling tool along the annular gap, and the gas returned by the conventional drilling tool carries rock debris to the underground plugging device through the large annular space between the drilling tool and a borehole and returns to the ground from the inner pipe of the double-wall drilling tool. In the use of the conventional underground plugging diverter, rock debris on the lower part has the possibility of entering the annular space on the upper part, and the large falling block on the upper part can not fall to the lower part of the underground plugging diverter to easily cause the risk of sticking the drill bit.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a reverse circulation drilling downhole plugging flow divider so as to reduce the risk of drill sticking at the plugging flow divider.
In order to achieve the purpose, the invention adopts the following design scheme: a downhole plugging diverter for reverse circulation drilling comprises a main shaft and a sealing ring. The upper part and the lower part of the main shaft are respectively connected with a double-wall drilling tool and a conventional drilling tool. The double-wall drilling tool comprises an inner pipe and an outer pipe, wherein a drilling medium return channel is formed inside the inner pipe, and a drilling medium injection channel is formed between the inner pipe and the outer pipe. The sealing ring is a rubber sealing ring and is processed into a circular rubber sheet; the main shaft is a shaft-shaped short section, a main channel A and a main channel B are axially processed in the main shaft, and a lateral channel is radially processed in the main shaft; the main channel A is a through hole, and drilling media injected into the channel through the double-wall drilling tool enter an internal channel of a conventional drilling tool at the lower part through the main channel A; the main channel B is a blind hole which is axially processed from top to bottom in the main shaft and is respectively communicated with the double-wall drilling tool return channel and the lateral channel; two raised circular steps are processed on the outer edge of the main shaft and respectively comprise a first step and a second step; the first step is positioned above the lateral channel, the second step is positioned above the first step, and the outer diameter of the second step is smaller than that of the first step; an axial groove which is axially parallel to the main shaft is processed on the outer edge of the first step; a circumferential groove which is vertical to the axial direction of the main shaft is processed on the outer edge of the second step; the sealing ring is arranged in the circumferential groove of the second step, and the outer diameter of the sealing ring is larger than that of the second step; large annular spaces are formed between the double-wall drilling tool and the conventional drilling tool and a well hole, the large annular spaces are separated into upper large annular spaces and lower large annular spaces by the sealing ring of the second step, and drilling media returning from the lower large annular spaces enter the return channel of the double-wall drilling tool through the lateral channel and the main channel B in sequence.
The upper end surface of the second step is preferably a slope surface, and a convex block is processed at the upper end of the slope surface. The axial groove machined on the outer edge of the first step is preferably a left-handed spiral groove. The lateral channel 25 is angled at 60 degrees to the axis of the main shaft 21.
The invention has the advantages that: the sealing ring can prevent the drilling medium on the lower part from returning to the upper part of the drilling tool, the sealing ring can be bent downwards when the drilling tool lifts, and a large well wall falling block can fall to the lower part of the plugging diverter through the sealing ring and the axial groove, so that the risk of drill sticking on the plugging diverter is reduced.
Drawings
FIG. 1 is a schematic view of a reverse circulation drilling downhole plugging diverter of the present invention taken along section A-A in FIG. 2.
FIG. 2 is a schematic top view of a reverse circulation drilling downhole plugging diverter of the present invention.
FIG. 3 is a schematic cross-sectional view taken along B-B of FIG. 2 of a reverse circulation drilling downhole plugging diverter of the present invention.
In the figure: 10. the double-wall drilling tool comprises a double-wall drilling tool body, 11, an inner pipe, 12, an outer pipe, 13, a return channel, 14, an injection channel, 20, a downhole blocking flow divider, 21, a main shaft, 22, a bump, 23, a circumferential groove, 24, an axial groove, 25, a lateral channel, 26, a main channel A, 27, a main channel B, 28, a first step, 29, a second step and 210 a sealing ring.
Detailed Description
The invention is further described with reference to figures 1, 2 and 3:
embodiment 1, a reverse circulation drilling downhole plugging diverter comprises a main shaft 21 and a sealing ring 210; wherein:
the main shaft 21 is a shaft-shaped short section, the upper end and the lower end of the main shaft are respectively provided with a joint connected with the double-wall drilling tool 10 and a conventional drilling tool, a main channel A26 and a main channel B27 are axially processed in the main shaft, and a lateral channel 25 is radially processed in the main shaft; the main channel A26 is a through hole which is communicated with the upper part and the lower part and is communicated with the injection channel 14 of the double-wall drilling tool and the internal channel of the conventional drilling tool; the main channel B27 is a blind hole which is axially processed from top to bottom in the main shaft 21 and is respectively communicated with the double-wall drilling tool return channel 13 and the lateral channel 25; the outer edge of the main shaft 21 is provided with two raised circular steps, namely a first step 28 and a second step 29; a first step 28 is located above the lateral channel 25, a second step 29 is located above the first step 28, the second step 29 having an outer diameter smaller than the outer diameter of the first step 28; an axial groove 24 is machined on the outer edge of the first step 28; a circumferential groove 23 is machined in the outer edge of the second step 29; the sealing ring 210 is mounted in the second step circumferential groove 23, the sealing ring 210 having an outer diameter greater than the outer diameter of the second step 29.
In embodiment 2, in addition to embodiment 1, the seal ring 210 is an annular rubber ring.
The upper end surface of the second step 29 is a slope surface, and a bump 22 is processed at the upper end of the slope surface.
The axial groove 24 machined on the outer edge of the first step is a left-handed spiral groove.
The lateral channel 25 is angled at 60 degrees to the axis of the main shaft 21.
Exemplary embodiment 3, a reverse circulation drilling downhole plugging diverter comprises a main shaft 21 and a sealing ring 210. The double wall drilling tool 10 includes an inner pipe 11 and an outer pipe 12, the inner pipe 12 forms a drilling medium return passage 13 therein, and a drilling medium injection passage 14 is formed between the inner pipe and the outer pipe. The sealing ring 210 is a circular rubber sheet; the main shaft 21 is a shaft-shaped short section, a main channel A26 and a main channel B27 are axially processed in the main shaft, and a lateral channel 25 is radially processed in the main shaft; the main passage a26 is a through hole through which drilling medium passing through the double wall drilling tool injection passage 14 enters the internal passage of the lower conventional drilling tool through the main passage a 26. The main passage B27 is a blind hole machined axially from top to bottom inside the main shaft 21 and is communicated with the double-wall drilling tool return passage 13 and the lateral passage 25, respectively.
The outer edge of the main shaft 21 is provided with two raised circular steps, namely a first step 28 and a second step 29; a first step 28 is located above the lateral passage 25 and a second step 29 is located above the first step 28, the second step 29 having an outer diameter smaller than the outer diameter of the first step 28. An axial groove 24 which is parallel to the axial direction of the main shaft 21 is processed at the outer edge of the first step 28; a circumferential groove 23 which is vertical to the axial direction of the main shaft 21 is processed at the outer edge of the second step 29; the sealing ring 210 is mounted in the second step circumferential groove 23, the sealing ring 210 having an outer diameter greater than the outer diameter of the second step 29. An annular space is formed between the double-wall drilling tool and the conventional drilling tool and the borehole, the annular space is divided into an upper annular space and a lower annular space by the sealing ring 210 of the second step 29, and the drilling medium returned from the lower annular space enters the double-wall drilling tool return passage 13 through the lateral passage 25 and the main passage B27 in sequence. The upper end surface of the second step 29 is a slope surface, and a convex block 22 is processed at the upper end of the slope surface. The axial groove 24 processed on the outer edge of the first step is a left-handed spiral groove; the lateral channel 25 is angled at 60 degrees to the axis of the main shaft 21.
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 (5)
1. A reverse circulation drilling downhole plugging flow divider is characterized by comprising a main shaft (21) and a sealing ring (210); wherein:
the main shaft (21) is a shaft-shaped short section, the upper end and the lower end of the main shaft are respectively provided with a joint connected with a double-wall drilling tool (10) and a conventional drilling tool, a main channel A (26) and a main channel B (27) are axially processed in the main shaft, and a lateral channel (25) is radially processed in the main shaft; the main channel A (26) is a through hole which is communicated up and down and is communicated with the injection channel (14) of the double-wall drilling tool and the internal channel of the conventional drilling tool; the main channel B (27) is a blind hole which is axially processed from top to bottom in the main shaft (21) and is respectively communicated with the double-wall drilling tool return channel (13) and the lateral channel (25); two raised circular steps, namely a first step (28) and a second step (29), are machined on the outer edge of the main shaft (21); the first step (28) is positioned above the lateral channel (25), the second step (29) is positioned above the first step (28), and the outer diameter of the second step (29) is smaller than that of the first step (28); an axial groove (24) is machined in the outer edge of the first step (28); a circumferential groove (23) is processed on the outer edge of the second step (29); the sealing ring (210) is arranged in the second step circumferential groove (23), and the outer diameter of the sealing ring (210) is larger than that of the second step (29).
2. The reverse circulation drilling downhole plugging diverter of claim 1, wherein: the sealing ring (210) is a circular rubber ring.
3. The reverse circulation drilling downhole plugging diverter of claim 1, wherein: the upper end surface of the second step (29) is a slope surface, and a convex block (22) is processed at the upper end of the slope surface.
4. The reverse circulation drilling downhole plugging diverter of claim 1, wherein: the axial groove (24) machined in the outer edge of the first step is a left-handed spiral groove.
5. The reverse circulation drilling downhole plugging diverter of claim 1, wherein: the lateral channel 25 is angled at 60 degrees to the axis of the main shaft 21.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910095224.8A CN111502590A (en) | 2019-01-31 | 2019-01-31 | Reverse circulation drilling downhole plugging diverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910095224.8A CN111502590A (en) | 2019-01-31 | 2019-01-31 | Reverse circulation drilling downhole plugging diverter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111502590A true CN111502590A (en) | 2020-08-07 |
Family
ID=71872495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910095224.8A Pending CN111502590A (en) | 2019-01-31 | 2019-01-31 | Reverse circulation drilling downhole plugging diverter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111502590A (en) |
-
2019
- 2019-01-31 CN CN201910095224.8A patent/CN111502590A/en active Pending
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