CN110952949A - Soluble plugging tool for tail end of velocity string and using method thereof - Google Patents
Soluble plugging tool for tail end of velocity string and using method thereof Download PDFInfo
- Publication number
- CN110952949A CN110952949A CN201911153903.2A CN201911153903A CN110952949A CN 110952949 A CN110952949 A CN 110952949A CN 201911153903 A CN201911153903 A CN 201911153903A CN 110952949 A CN110952949 A CN 110952949A
- Authority
- CN
- China
- Prior art keywords
- plugging tool
- soluble
- nipple
- plug
- plugging
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 17
- 210000002445 nipple Anatomy 0.000 claims description 51
- 238000007789 sealing Methods 0.000 claims description 38
- 238000005096 rolling process Methods 0.000 claims description 16
- 239000004576 sand Substances 0.000 claims description 16
- 230000002265 prevention Effects 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 241000521257 Hydrops Species 0.000 claims description 3
- 206010030113 Oedema Diseases 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims 2
- 239000007789 gas Substances 0.000 abstract description 33
- 239000007788 liquid Substances 0.000 abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 3
- 238000003197 gene knockdown Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 8
- 239000009096 changqing Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000005514 two-phase flow Effects 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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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 soluble plugging tool for the tail end of a speed pipe column and a using method thereof. The production channel is opened by dissolving the soluble plug through the accumulated liquid at the bottom of the well, the problem that the plug is difficult to knock down after the coiled tubing is put into the well is solved, and compared with a nitrogen booster vehicle, the production channel has the advantage that the operation cost is reduced. When the fluid of the gas well is ensured not to be output from the coiled tubing in the construction process, the coiled tubing is made to enter the gas well, the water drainage and gas production functions of the speed pipe column are exerted in time, and the stable production of the gas well is guaranteed.
Description
Technical Field
The invention relates to the technical field of gas field exploitation, in particular to a soluble plugging tool for a tail end of a velocity string and a using method thereof.
Background
Along with the continuous production time of the gas well, the productivity of the gas well is gradually reduced, liquid begins to accumulate at the bottom of the gas well when the production rate is lower than the critical liquid carrying flow rate, and if liquid discharging measures are not taken in time, the gas well can be flooded with water and even stops producing. The speed pipe column water drainage gas production technology is based on shaft two-phase flow and minimum liquid carrying flow theory, a coiled tubing with a small diameter is put into an original phi 73mm oil pipe of a gas well to serve as a production pipe column, the coiled tubing is cut off and then hung on a gas production well head through a special hanger to be used as a speed pipe column water drainage gas production, the technology can reduce the critical liquid carrying flow rate of the gas well and increase the gas flow rate in the shaft, so that the liquid carrying capacity of the gas well is improved, the gas well is ensured not to accumulate liquid for a long time, and the stable production of the gas well is ensured. According to the technology, before coiled tubing is lowered into a shaft, a packer is preset at the bottom end of the coiled tubing on the ground, so that gas well fluid is prevented from being produced from the coiled tubing in the pipe lowering process.
At present, the technology is applied to more than 800 wells in the Changqing oil field with the largest petroleum, and hundreds of wells are applied every year, so that the technology becomes one of three main drainage and gas production technologies of the Changqing oil field. However, in the field application process of the technology, the blanking plug preset at the bottom of the speed pipe column is not easy to knock off sometimes, a nitrogen booster vehicle needs to be used for knocking off the blanking plug, more manpower and material resources are consumed, the operation cost is increased, sometimes the blanking plug cannot be knocked off even, and the speed pipe column water drainage and gas production of the gas well are seriously influenced.
Disclosure of Invention
The invention aims to provide a soluble plugging tool for the tail end of a speed pipe column and a using method thereof, and solves the problem that the bottom end of the speed pipe column is blocked and is difficult to knock off in the prior art.
The technical scheme of the invention is as follows: the utility model provides a soluble shutoff instrument of speed tubular column tail end, includes shutoff tool nipple joint, and shutoff tool nipple joint inner wall is connected with the inner union, is connected with the plug seat on the inner wall of inner union lower extreme, and the plug seat lower extreme is connected with soluble end cap, and shutoff tool nipple joint lower extreme is connected with the seeker, still opens the sand control seam on the shutoff tool nipple joint lateral wall.
Furthermore, a rolling groove is formed in the upper end of the plugging tool nipple, a first sealing groove is formed in the outer wall of the plugging tool nipple below the rolling groove, and a first sealing ring is connected in the first sealing groove.
Furthermore, a second sealing groove is formed in the joint of the inner connecting pipe and the plugging tool nipple, and a second sealing ring is connected in the second sealing groove.
Furthermore, a third sealing groove is formed at the joint of the plug seat and the inner connecting pipe, and a third sealing ring is connected in the third sealing groove.
Furthermore, a sleeve is sleeved outside the soluble plug.
Further, the guide head is connected with the plugging tool short section through a third pin.
Furthermore, the soluble plug is soluble aluminum.
Furthermore, the sand control seam is positioned on the side wall of the plugging tool nipple below the soluble plug.
A method for using a speed string tail end soluble plugging tool comprises the steps of rolling a rolling groove in the upper end of a short section of the plugging tool to the lower end of a continuous oil pipe, enabling the short section of the plugging tool to enter a shaft of a gas well along with the continuous oil pipe, enabling bottom hole accumulated liquid to enter the bottom of the short section of the plugging tool from a sand prevention seam, dissolving a soluble plug, enabling a sleeve to fall to the bottom of the short section of the plugging tool, communicating with an internal channel of the short section of the plugging tool plugged by the soluble plug and the sleeve, and discharging water and gas by adopting.
The invention has the beneficial effects that the production channel is opened by dissolving the soluble plug by the accumulated liquid at the bottom of the well, the problem that the plug is difficult to be knocked off after the coiled tubing is put in is solved, and the operation cost is reduced compared with that of a nitrogen booster vehicle for knocking the plug. When the fluid of the gas well is ensured not to be output from the coiled tubing in the construction process, the coiled tubing is made to enter the gas well, the water drainage and gas production functions of the speed pipe column are exerted in time, and the stable production of the gas well is guaranteed.
Drawings
FIG. 1 is a schematic structural view of a soluble plug of a soluble plugging tool at the tail end of a velocity string when the soluble plug is not dissolved;
FIG. 2 is a schematic structural view of a soluble plug of a soluble plugging tool at the tail end of a velocity string after the soluble plug has dissolved;
in the figure: 1. the continuous oil pipe comprises a continuous oil pipe body, 2. a rolling groove, 3. a first sealing ring, 4. a plugging tool short section, 5. a second sealing ring, 6. an inner connecting pipe, 7. a first pin, 8. a plug seat, 9. a third sealing ring, 10. a second pin, 11. a screw thread, 12. a soluble plug, 13. a sleeve, 14. a sand prevention gap, 15. a third pin and 16. a guide head.
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Detailed Description
[ example 1 ]
As shown in fig. 1 and 2, the soluble plugging tool for the tail end of the velocity string comprises a plugging tool nipple 4, wherein the inner wall of the plugging tool nipple 4 is connected with an inner connecting pipe 6, the inner wall of the lower end of the inner connecting pipe 6 is connected with a plugging head seat 8, the lower end of the plugging head seat 8 is connected with a soluble plugging head 12, the lower end of the plugging tool nipple 4 is connected with a guide head 16, and a sand prevention gap 14 is further formed in the side wall of the plugging tool nipple 4.
The lower extreme of shutoff head seat 8 is connected with soluble end cap 12 through the screw thread, the scope of whole shutoff head seat 8 has been sealed up to soluble end cap 12 for liquid can't be from getting into the space of shutoff head seat 8 top in shutoff tool nipple 4, 4 lower extremes of shutoff tool nipple are connected with guide head 16, be used for guiding the lower income of whole shutoff instrument, still open sand control seam 14 on 4 lateral walls of shutoff tool nipple, can guarantee that natural gas and shaft bottom hydrops get into inside 4 of shutoff tool nipple along sand control seam 14, can prevent again that fracturing sand, stratum sand from getting into and blocking shutoff tool nipple 4.
[ example 2 ]
As shown in fig. 1 and fig. 2, on the basis of embodiment 1, a rolling groove 2 is formed at the upper end of the plugging tool nipple 4, a first sealing groove is formed in the outer wall of the plugging tool nipple 4 below the rolling groove 2, and a first sealing ring 3 is connected in the first sealing groove.
The upper end of the plugging tool nipple 4 is provided with a rolling groove 2 so as to be rolled with the lower end of the coiled tubing 1, the outer wall of the plugging tool nipple 4 below the rolling groove 2 is also provided with a sealing groove, and a first sealing ring 3 is connected in the sealing groove, so that when the coiled tubing 1 is rolled onto the plugging tool nipple 4, the inner wall of the coiled tubing 1 and the outer wall of the plugging tool nipple 4 are prevented from air leakage.
And a second sealing groove is formed at the joint of the inner connecting pipe 6 and the plugging tool nipple 4, and a second sealing ring 5 is connected in the second sealing groove. The inner connecting pipe 6 is connected with the plugging tool nipple 4 through a first pin 7, and meanwhile, a second sealing ring 5 is further arranged between the inner connecting pipe 6 and the plugging tool nipple 4, so that air leakage between the inner connecting pipe 6 and the plugging tool nipple 4 is guaranteed.
And a third sealing groove is formed at the joint of the plug seat 8 and the inner connecting pipe 6, and a third sealing ring 9 is connected in the third sealing groove. The plug seat 8 is connected with the inner connecting pipe 6 through a second pin 10, and a third sealing ring 9 is connected between the plug seat 8 and the inner connecting pipe 6, so that air leakage between the plug seat 8 and the inner connecting pipe 6 is guaranteed. Through the sealing of the second sealing ring 5 and the third sealing ring 9, the inlet of the internal channel of the plugging tool nipple 4 is only provided with a plug seat 8, and the plug seat 8 is plugged by a soluble plug 12, so that the gas well fluid is prevented from being produced from the coiled tubing in the construction process.
The soluble plug 12 is also sleeved with a sleeve 13. The sleeve 13 can effectively control the dissolution speed of the soluble plug 12, prevent the soluble plug 12 from melting from the periphery, and prolong the working time of the soluble plug 12 in the well.
The guide head 16 is connected with the plugging tool short section 4 through a third pin 15.
The soluble plug 12 is soluble aluminum. The material of the soluble plug 12 is soluble aluminum.
The sand control joint 14 is positioned on the side wall of the plugging tool short section 4 below the soluble plug 12.
So that the accumulated liquid at the bottom of the well can enter the inner part of the plugging tool nipple 4 through the sand control joint 14 to dissolve the soluble plug 12.
[ example 3 ]
As shown in fig. 1 and 2, on the basis of embodiment 2, a method for using a speed string tail end soluble plugging tool includes rolling a rolling groove 2 at the upper end of a plugging tool nipple 4 to the lower end of a coiled tubing 1, lowering the plugging tool nipple 4 into a gas well shaft along with the coiled tubing 1, dissolving a soluble plug 12 after bottom hole effusion enters the bottom of the plugging tool nipple 4 from a sand prevention seam 14, dropping a sleeve 13 to the bottom of the plugging tool nipple 4, opening an internal channel of the plugging tool nipple 4 plugged by the soluble plug 12 and the sleeve 13, draining and producing gas by using a speed string, and removing the bottom hole effusion.
Rolling the rolling groove 2 at the upper end of the plugging tool nipple 4 on the ground to the lower end of the continuous oil pipe 1, moving the rolling groove and the continuous oil pipe 1 to be lowered into a shaft of the gas well, after pipe lowering operation is completed, accumulated liquid at the bottom of the well enters the plugging tool nipple 4 through the sand prevention seam 14, the soluble plug 12 is slowly dissolved by the accumulated liquid, the sleeve 13 falls to the bottom end of the plugging tool nipple 4 after the soluble plug 12 is completely dissolved, a channel is formed in the plug seat 8 part blocked by the soluble plug 12, a subsequent speed pipe column drainage gas production technology can be carried out, the accumulated liquid at the bottom of the well is removed, and normal.
Claims (9)
1. The utility model provides a soluble shutoff instrument of speed tubular column tail end which characterized in that: the plugging tool nipple comprises a plugging tool nipple (4), wherein an inner connecting pipe (6) is connected to the inner wall of the plugging tool nipple (4), a plug seat (8) is connected to the inner wall of the lower end of the inner connecting pipe (6), a soluble plug (12) is connected to the lower end of the plug seat (8), a guide head (16) is connected to the lower end of the plugging tool nipple (4), and a sand prevention gap (14) is further formed in the side wall of the plugging tool nipple (4).
2. The dissolvable plugging tool of claim 1, wherein: the upper end of the plugging tool nipple (4) is provided with a rolling groove (2), the outer wall of the plugging tool nipple (4) below the rolling groove (2) is provided with a first sealing groove, and a first sealing ring (3) is connected in the first sealing groove.
3. The dissolvable plugging tool of claim 1, wherein: and a second sealing groove is formed in the joint of the inner connecting pipe (6) and the plugging tool nipple (4), and a second sealing ring (5) is connected in the second sealing groove.
4. The dissolvable plugging tool of claim 1, wherein: and a third sealing groove is formed at the joint of the plug seat (8) and the inner connecting pipe (6), and a third sealing ring (9) is connected in the third sealing groove.
5. The dissolvable plugging tool of claim 1, wherein: the soluble plug (12) is also sleeved with a sleeve (13).
6. The dissolvable plugging tool of claim 1, wherein: the guide head (16) is connected with the plugging tool short section (4) through a third pin (15).
7. The dissolvable plugging tool of claim 1, wherein: the soluble plug (12) is soluble aluminum.
8. The dissolvable plugging tool of claim 1, wherein: the sand control joint (14) is positioned on the side wall of the plugging tool nipple (4) below the soluble plug (12).
9. A use method of a soluble plugging tool at the tail end of a velocity string is characterized in that: roll extrusion groove (2) roll extrusion to coiled tubing (1) lower extreme with shutoff tool nipple joint (4) upper end, with shutoff tool nipple joint (4) along with in coiled tubing (1) descends into the gas well pit shaft, after bottom hole hydrops got into shutoff tool nipple joint (4) bottom from sand control seam (14) and dissolved soluble end cap (12), sleeve (13) dropped to shutoff tool nipple joint (4) bottom, shutoff tool nipple joint (4) internal channel by soluble end cap (12) and sleeve (13) shutoff was opened, adopt speed tubular column drainage gas production, get rid of bottom hole hydrops.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911153903.2A CN110952949A (en) | 2019-11-22 | 2019-11-22 | Soluble plugging tool for tail end of velocity string and using method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911153903.2A CN110952949A (en) | 2019-11-22 | 2019-11-22 | Soluble plugging tool for tail end of velocity string and using method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110952949A true CN110952949A (en) | 2020-04-03 |
Family
ID=69978037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911153903.2A Pending CN110952949A (en) | 2019-11-22 | 2019-11-22 | Soluble plugging tool for tail end of velocity string and using method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110952949A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111720086A (en) * | 2020-07-08 | 2020-09-29 | 中国石油天然气集团有限公司 | Impact type pipe end plugging device and using method |
| CN112302586A (en) * | 2020-10-30 | 2021-02-02 | 中国石油天然气股份有限公司 | Production process for putting speed pipe column with choke at tail end into well |
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| US20120168152A1 (en) * | 2010-12-29 | 2012-07-05 | Baker Hughes Incorporated | Dissolvable barrier for downhole use and method thereof |
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| US20180148991A1 (en) * | 2016-09-30 | 2018-05-31 | Conocophillips Company | Tool for metal plugging or sealing of casing |
| CN109403908A (en) * | 2018-11-06 | 2019-03-01 | 中国石油天然气股份有限公司 | A kind of speed column sand control formula calker and application method |
| CN109630060A (en) * | 2018-11-05 | 2019-04-16 | 中国石油化工股份有限公司 | A kind of complete well operation tubing string of repeatable no killing well and construction technology |
| CN208934650U (en) * | 2018-11-10 | 2019-06-04 | 西南石油大学 | A kind of dissolvable oil well pipe plug destroyed |
| CN110439499A (en) * | 2019-09-05 | 2019-11-12 | 陕西臻易石油技术有限公司 | Inhibition soluble type blanking plug and its minimizing technology suitable for speed column end |
| CN211666685U (en) * | 2019-11-22 | 2020-10-13 | 中国石油天然气股份有限公司 | Soluble plugging tool for tail end of speed pipe column |
-
2019
- 2019-11-22 CN CN201911153903.2A patent/CN110952949A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20120168152A1 (en) * | 2010-12-29 | 2012-07-05 | Baker Hughes Incorporated | Dissolvable barrier for downhole use and method thereof |
| CN102852500A (en) * | 2012-09-28 | 2013-01-02 | 四川仁智油田技术服务股份有限公司 | Draining gas recovery device for capillary pipe and operation method of draining gas recovery device |
| US20180148991A1 (en) * | 2016-09-30 | 2018-05-31 | Conocophillips Company | Tool for metal plugging or sealing of casing |
| CN106677735A (en) * | 2016-11-23 | 2017-05-17 | 中国石油天然气股份有限公司 | Blocking device for drainage gas recovery of horizontal well velocity string |
| CN109630060A (en) * | 2018-11-05 | 2019-04-16 | 中国石油化工股份有限公司 | A kind of complete well operation tubing string of repeatable no killing well and construction technology |
| CN109403908A (en) * | 2018-11-06 | 2019-03-01 | 中国石油天然气股份有限公司 | A kind of speed column sand control formula calker and application method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111720086A (en) * | 2020-07-08 | 2020-09-29 | 中国石油天然气集团有限公司 | Impact type pipe end plugging device and using method |
| CN111720086B (en) * | 2020-07-08 | 2024-01-19 | 中国石油天然气集团有限公司 | Impact type pipe end blanking plug and use method thereof |
| CN112302586A (en) * | 2020-10-30 | 2021-02-02 | 中国石油天然气股份有限公司 | Production process for putting speed pipe column with choke at tail end into well |
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