CN102619486B - Sand washing type fishing technology for sand prevention pipe string - Google Patents
Sand washing type fishing technology for sand prevention pipe string Download PDFInfo
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- CN102619486B CN102619486B CN201210106374.2A CN201210106374A CN102619486B CN 102619486 B CN102619486 B CN 102619486B CN 201210106374 A CN201210106374 A CN 201210106374A CN 102619486 B CN102619486 B CN 102619486B
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- sand
- pipe
- packer
- sand control
- sand prevention
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Abstract
The invention discloses a sand washing type fishing technology for a sand prevention pipe string, which comprises the steps of 1) cutting off a blind pipe of a top sand prevention pipe section; 2) recovering a top packer; 3) running a sand washing pipe string into the residual sand prevention pipe string of the top sand prevention pipe section; 4) slowly putting down the sand washing pipe string, and simultaneously, circulating washing liquid to conduct sand washing for annular space between the top sand prevention pipe section and a casing pipe; 5) cutting off a blind pipe which is close to the lower portion of an intermediate isolation packer on the top currently; 6) fishing the residual sand prevention pipe string of the top sand prevention pipe section and an intermediate isolation packer at the bottom of the top sand prevention pipe section; and 7) repeating steps 3) -6) to fish out the residual sand prevention pipe string of the next sand prevention pipe section and an intermediate isolation packer at the bottom of the next sand prevention pipe section until all the sand prevention pipe sections and packers are fished out. The sand washing type fishing technology can solve the problem that conventional casing milling is difficult to adopt due to the small annular space between a screen pipe and the casing pipe, effectively speed up the fishing schedule, accelerate the operation effectiveness for a given period of time, control the expenses in a work period and save the operation cost.
Description
Technical field
The present invention relates to a kind of fishing process of oil-water well sand control pipe, particularly relate to a kind of sand control pipe sand washing formula fishing process.
Background technology
The most of oil-water wells in Bohai Sea Area shake out seriously, and screen casing mechanical sand control becomes a kind of conventional treatment method, and through producing for many years, sand control pipe lost efficacy because of a variety of causes.For the salvaging of sand control pipe, thinking is in the past segmentation cover milling sand control pipe, and then shocking reversing stuck freeing is salvaged.But for major diameter sand control pipe, because gap is too little, cover milling operating risk is larger, and conventional Refloatation method uncertain factor is more, cannot accurately control operating risk and period of construction cost.
Summary of the invention
The present invention provides a kind of sand control pipe sand washing formula fishing process for solving the technical problem existing in known technology, less in order to solve between screen casing and sleeve pipe annular space, adopts conventional cover to be milled with the problem of difficulty.
The technical scheme that the present invention takes for the technical problem existing in solution known technology is: a kind of sand control pipe sand washing formula fishing process, and the top packer that this sand control pipe is set gradually from top to bottom, at least one intermediate isolating packer and sump packer are divided into several sand control pipeline sections that are positioned at different oil reservoirs; The upper end of each sand control pipeline section is blind pipe, and remainder is screen casing; This technique comprises the following steps:
One) cut off the blind pipe of the superiors' sand control pipeline section;
Two) be lowered to special tool, deblocking also reclaims top packer;
Three) sand-flushing pipe column is lowered in the residue sand control pipe of the superiors' sand control pipeline section, the bottom of sand-flushing pipe column carries cup packer, the endoporus sealing of upper cup packer and this residue sand control pipe, the flushing liquor outlet on sand-flushing pipe column is positioned at the below of cup packer;
Four) slowly transfer sand-flushing pipe column, circulating flushing washing lotion, carries out sand washing to the annular space between the superiors' sand control pipeline section and sleeve pipe simultaneously, and the sand grains between the superiors' sand control pipeline section and sleeve pipe is rinsed well;
Five) cut off near the blind pipe that is currently located at the intermediate isolating packer bottom of topmost;
Six) salvage the residue sand control pipe of the superiors' sand control pipeline section and be positioned at the intermediate isolating packer of its bottom;
Seven) repeating step three)～six), pull the residue sand control pipe of lower one deck sand-proof pipe section out and be positioned at its bottom intermediate isolating packer, until dragged for all sand control pipeline sections and packer.
The bottom of described sand-flushing pipe column also carries the down cup packer that is positioned at cup packer below, down cup packer and upper cup packer are separated from each other, and with the endoporus sealing of sand control pipeline section, the flushing liquor outlet on sand-flushing pipe column is between upper cup packer and down cup packer.
Described step 4) flushing liquor in is workover fluid.
Advantage and good effect that the present invention has are: adopt and in sand control pipe, progressively transfer sand-flushing pipe column, after layering is rinsed the sand grains in the annular space that is deposited on sand control pipe and sleeve pipe and forms, cut off the following blind pipe of packer, layering fishing sand-proof tubing string and packer, can avoid conventional operating risk of overlapping milling Refloatation method, can effectively reduce the uncertainty of fishing, effectively improve salvaging progress, accelerate operation timeliness, control period of construction cost, save operating cost.Too small to annular space between screen casing and sleeve pipe, cannot overlap the sand control pipe of milling operation and salvage especially applicable.
Accompanying drawing explanation
Fig. 1 carries out the structural representation of cutting operation for applying the present invention;
The structural representation that Fig. 2 carries out sand washing operation for application the present invention;
Fig. 3 carries out the structural representation of fishing for applying the present invention.
The specific embodiment
For further understanding summary of the invention of the present invention, Characteristic, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
Refer to Fig. 1～Fig. 3, a kind of sand control pipe sand washing formula fishing process, the top packer 1 that this sand-proof pipe is set gradually from top to bottom, at least one intermediate isolating packer 2 and sump packer 3 are divided into several sand control pipeline sections that are positioned at different oil reservoirs; The upper end of each sand control pipeline section is blind pipe, and remainder is screen casing; This technique comprises the following steps:
One) cutting tubing string 4 is lowered in the superiors' sand control pipeline section, cuts off the blind pipe of this pipeline section, refer to Fig. 1;
Two) be lowered to special tool, deblocking also reclaims top packer 1;
Three) sand-flushing pipe column 5 is lowered in the residue sand control pipe of the superiors' sand control pipeline section, the bottom of sand-flushing pipe column 5 carries cup packer 6, upper cup packer 6 seals with the endoporus of this residue sand control pipe, flushing liquor outlet 5-1 on sand-flushing pipe column 5 is positioned at the below of cup packer 6, refers to Fig. 2; In order to reduce flushing liquor, miss downwards, can add in the bottom of sand-flushing pipe column 5 band down cup packer 7, down cup packer 7 should be positioned at the below of cup packer 6, down cup packer 7 and upper cup packer 6 are separated from each other, and the endoporus sealing with above-mentioned residue sand control pipe, and make the flushing liquor on sand-flushing pipe column export 5-1 between upper cup packer 6 and down cup packer 7, so that the flushing liquor penetrating from sand-flushing pipe column 5 is injected in the annular space of the superiors' sand control pipeline section and sleeve pipe 8 formation.
Four) slowly transfer sand-flushing pipe column 5, while circulating flushing washing lotion, the annular space forming between the superiors' sand control pipeline section and sleeve pipe 8 is carried out to sand washing operation, progressively the sand grains that is deposited on 8 of the superiors' sand control pipeline section and sleeve pipes is taken out of to well head, the annular space forming between the superiors' sand control pipeline section and sleeve pipe 8 is rinsed well, and sand-flushing pipe column completes the flushing of one deck sand control pipeline section for 5 one times.Above-mentioned flushing liquor is preferably used the workover fluid that prop-carrying capacity is good.
Five) cutting tubing string 4 is lowered in sand control pipe, cuts off near the blind pipe that is currently located at intermediate isolating packer 2 bottoms of topmost;
Six) fishing tool 9 is lowered in sand control pipe, salvages the residue sand control pipe of the superiors' sand control pipeline section and be positioned at the intermediate isolating packer 2 of its bottom;
Seven) repeating step three)～six), pull the residue sand control pipe of lower one deck sand-proof pipe section out and be positioned at its bottom intermediate isolating packer, until dragged for all sand control pipeline sections and packer.
Although by reference to the accompanying drawings the preferred embodiments of the present invention are described above; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not departing from the scope situation that aim of the present invention and claim protect, can also make a lot of forms, within these all belong to protection scope of the present invention.
Claims (3)
1. a sand control pipe sand washing formula fishing process, the top packer that this sand control pipe is set gradually from top to bottom, at least one intermediate isolating packer and sump packer are divided into several sand control pipeline sections that are positioned at different oil reservoirs; The upper end of each sand control pipeline section is blind pipe, and remainder is screen casing; It is characterized in that, this technique comprises the following steps:
One) cut off the blind pipe of the superiors' sand control pipeline section;
Two) be lowered to special tool, deblocking also reclaims top packer;
Three) sand-flushing pipe column is lowered in the residue sand control pipe of the superiors' sand control pipeline section, the bottom of sand-flushing pipe column carries cup packer, the endoporus sealing of upper cup packer and this residue sand control pipe, the flushing liquor outlet on sand-flushing pipe column is positioned at the below of cup packer;
Four) slowly transfer sand-flushing pipe column, circulating flushing washing lotion, carries out sand washing to the annular space between the superiors' sand control pipeline section and sleeve pipe simultaneously, and the sand grains between the superiors' sand control pipeline section and sleeve pipe is rinsed well;
Five) cut off near the blind pipe that is currently located at the intermediate isolating packer bottom of topmost;
Six) salvage the residue sand control pipe of the superiors' sand control pipeline section and be positioned at the intermediate isolating packer of its bottom;
Seven) repeating step three)～six), pull the residue sand control pipe of lower one deck sand-proof pipe section out and be positioned at its bottom intermediate isolating packer, until dragged for all sand control pipeline sections and packer.
2. sand control pipe sand washing formula fishing process according to claim 1, it is characterized in that, the bottom of described sand-flushing pipe column also carries the down cup packer that is positioned at cup packer below, down cup packer and upper cup packer are separated from each other, and with the endoporus sealing of sand control pipeline section, the flushing liquor outlet on sand-flushing pipe column is between upper cup packer and down cup packer.
3. sand control pipe sand washing formula fishing process according to claim 1, is characterized in that described step 4) in flushing liquor be workover fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210106374.2A CN102619486B (en) | 2012-04-11 | 2012-04-11 | Sand washing type fishing technology for sand prevention pipe string |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210106374.2A CN102619486B (en) | 2012-04-11 | 2012-04-11 | Sand washing type fishing technology for sand prevention pipe string |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102619486A CN102619486A (en) | 2012-08-01 |
| CN102619486B true CN102619486B (en) | 2014-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210106374.2A Expired - Fee Related CN102619486B (en) | 2012-04-11 | 2012-04-11 | Sand washing type fishing technology for sand prevention pipe string |
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| Country | Link |
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| CN (1) | CN102619486B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108104757B (en) * | 2017-08-17 | 2020-04-10 | 中国石油天然气股份有限公司 | Unfreezing tool and unfreezing method |
| CN112049603B (en) * | 2020-09-14 | 2022-11-18 | 中国海洋石油集团有限公司 | Method for packing outer annular space of sieve tube |
| CN113482561A (en) * | 2021-05-26 | 2021-10-08 | 中海油能源发展股份有限公司 | Oil and gas well sealing casing recovery device and recovery method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4550781A (en) * | 1984-06-06 | 1985-11-05 | A-Z International Tool Company | Method of and apparatus for cutting and recovering of submarine surface casing |
| CN101054895A (en) * | 2007-05-30 | 2007-10-17 | 北京通盛威尔工程技术有限公司 | Sand blower release-controllable multiple-layer laminated fracture string device and controllable release method |
| CN201363116Y (en) * | 2009-03-20 | 2009-12-16 | 贾延锋 | Integrated process device for sand removal and fishing outside pipe |
| CN101899956A (en) * | 2010-03-17 | 2010-12-01 | 北京华油油气技术开发有限公司 | Method for salvaging electric pump pipe column fish |
| CN102174880A (en) * | 2011-02-28 | 2011-09-07 | 中国石油集团川庆钻探工程有限公司 | Releasing method applicable to packer layered sand fracturing string |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6725934B2 (en) * | 2000-12-21 | 2004-04-27 | Baker Hughes Incorporated | Expandable packer isolation system |
-
2012
- 2012-04-11 CN CN201210106374.2A patent/CN102619486B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4550781A (en) * | 1984-06-06 | 1985-11-05 | A-Z International Tool Company | Method of and apparatus for cutting and recovering of submarine surface casing |
| CN101054895A (en) * | 2007-05-30 | 2007-10-17 | 北京通盛威尔工程技术有限公司 | Sand blower release-controllable multiple-layer laminated fracture string device and controllable release method |
| CN201363116Y (en) * | 2009-03-20 | 2009-12-16 | 贾延锋 | Integrated process device for sand removal and fishing outside pipe |
| CN101899956A (en) * | 2010-03-17 | 2010-12-01 | 北京华油油气技术开发有限公司 | Method for salvaging electric pump pipe column fish |
| CN102174880A (en) * | 2011-02-28 | 2011-09-07 | 中国石油集团川庆钻探工程有限公司 | Releasing method applicable to packer layered sand fracturing string |
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| CN102619486A (en) | 2012-08-01 |
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Address after: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee after: Tianjin Branch of China Sea Prtroleum (China) Co., Ltd. Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Beijing, Chaoyangmen, North Street, No. 25, No. Co-patentee before: Tianjin Branch of China Sea Prtroleum (China) Co., Ltd. Patentee before: China National Offshore Oil Corporation |
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Granted publication date: 20140910 Termination date: 20200411 |
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| CF01 | Termination of patent right due to non-payment of annual fee |