CN101949272A - Method for repairing oil and gas well by using chemical gel - Google Patents
Method for repairing oil and gas well by using chemical gel Download PDFInfo
- Publication number
- CN101949272A CN101949272A CN2010102645474A CN201010264547A CN101949272A CN 101949272 A CN101949272 A CN 101949272A CN 2010102645474 A CN2010102645474 A CN 2010102645474A CN 201010264547 A CN201010264547 A CN 201010264547A CN 101949272 A CN101949272 A CN 101949272A
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- well
- gel
- workover
- oil
- oil gas
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000126 substance Substances 0.000 title abstract 3
- 239000012530 fluid Substances 0.000 claims abstract description 26
- 239000007789 gas Substances 0.000 claims description 43
- XQCFHQBGMWUEMY-ZPUQHVIOSA-N Nitrovin Chemical compound C=1C=C([N+]([O-])=O)OC=1\C=C\C(=NNC(=N)N)\C=C\C1=CC=C([N+]([O-])=O)O1 XQCFHQBGMWUEMY-ZPUQHVIOSA-N 0.000 claims description 19
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 239000003345 natural gas Substances 0.000 claims description 4
- 206010010214 Compression fracture Diseases 0.000 claims description 3
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims description 3
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims description 3
- 230000006378 damage Effects 0.000 abstract description 7
- 230000009191 jumping Effects 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 28
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000005553 drilling Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 4
- 208000027418 Wounds and injury Diseases 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 208000014674 injury Diseases 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 description 2
- 229940123973 Oxygen scavenger Drugs 0.000 description 2
- 230000000844 anti-bacterial effect Effects 0.000 description 2
- 239000003899 bactericide agent Substances 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 2
- 239000002775 capsule Substances 0.000 description 2
- 230000005465 channeling Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000002343 natural gas well Substances 0.000 description 2
- 235000010265 sodium sulphite Nutrition 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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Abstract
The invention discloses a method for repairing an oil and gas well by using chemical gel, which relates to the technical field of well repairing operation. The method applies the chemical gel to workover of the oil and gas well, forms a section of gel slug in the shaft, temporarily seals off fluid in the stratum, prevents the stratum fluid from jumping out to cause blowout, simultaneously can prevent a great amount of kill fluid from leaking into the stratum to cause damage to the oil and gas reservoir, and achieves the purposes of safe, effective and rapid workover and oil and gas reservoir protection.
Description
Technical field
The present invention relates to the workover treatment technical field, exactly relate to the method that a kind of applied chemistry gel carries out the well workover of oil gas well.
Background technology
The oil gas well is produced oil and natural gas after a period of time, production tube corrosion (fracture and perforation etc.) in the well can take place in the well that has, and losing the situation of OIH gas channel, the well that has can take place that the down-hole payzone shakes out, the borehole wall collapses and stop up the situation of shaft bottom gas stream passage.Take place directly to cause oil gas well reduce or stop production after these situations.Need immediately this class well is tripped out and changes in the well tubing string or changes workover treatment such as the end obstruction that opens a hole behind the tubing string in the well, thereby recover the production of oil gas well.
External for preventing the blowout and the reservoir damage of workover treatment, employing be a kind of tubing packer of crossing.This tubing packer of crossing is electric hydraulic pump and hydraulic fluid chamber to be arranged in a kind of, and appearance is pasted with the capsule of metal card tile.Before a bite well is wanted well workover, just before the oil pipe first time, earlier this packer is lowered into the shaft bottom by oil pipe.Be lowered to cable by oil pipe again and dock, make the electric hydaulic pump work in the packer, from pumping into hydraulic oil in the shoe cream room to capsule with packer.Make the packer distending, the slips sheet on the squeeze packer is fixed on the interior casing wall of pit shaft packer, enters pit shaft thereby cut off payzone oil gas.The workover fluid payzone that also just can not bleed in the well.After well has been repaiied, from oil pipe in trip out packer by oil pipe after to the packer pressure release with cable again.But offshore company does not take out this packer at present, and high technological service only is provided.Domestic also do not have this class to cross the tubing packer technology at present, carries out well workover after having only pressured well, and the payzone because well killing fluid bleeds in a large number causes the situation that output reduces significantly even stops production after the well workover.When carrying out workover treatment, in order to prevent blowout, the workover fluid column pressure again must be greater than payzone pressure in the well, and this just makes the workover fluid payzone that bleeds easily, causes the grievous injury of oil-gas Layer, often is that well has been fixed, and oil and gas production has not but had.If it is former thereby can't implement because of not having back-pressure valve, tubing string burn into payzone pressure to be lower than pressure and hydrostatic pressure etc. on the flow string (tubing string) again to implement the underbalance workover treatment.
Publication number is CN1687557, open day be the Chinese patent literature on October 26th, 2005 used when disclosing a kind of drilling well or well workover prevent to pull out of hole the time method of blowout takes place, it comprises valve body, opening device and shutoff device, it is characterized in that: top connection and lower contact are tightly connected, the core tube is in top connection, valve is connected with top connection by bearing pin, and torsion spring is connected on valve and the bearing pin, and shutoff device links to each other with drilling tool.Be connected with jump ring in the top connection.The method that blowout takes place when preventing to pull out of hole begins to be connected on the protective casing thereupon under the lower going-into-well, instrument will open, cut out under the situation of needs after going into the well operate as normal along with being lowered to, tripping out of drilling tool or workover tool, thereby prevent gases at high pressure or liquid overflow in the well.The use of this instrument can be optimized gas under-balanced drilling technology technology greatly, reduces the drillng operation time and avoids the pollution of drilling fluid to reservoir.
But when technique scheme does not still solve well workover, the technical problem that can only " carry out well workover behind the pressured well, because the well killing fluid payzone that bleeds in a large number, cause output after the well workover to reduce significantly even stop production ".
Summary of the invention
At blowout in the above-mentioned natural gas well operation and leakage (causing the payzone injury) problem; the present invention proposes the method that a kind of applied chemistry gel carries out the well workover of oil gas well; this method applied chemistry gel carries out the well workover of oil gas well; in pit shaft, form one section gel slug; fluid in the temporary transient packing stratum; prevent to scurry out on the formation fluid (as: gas) and cause blowout; can prevent again that simultaneously the well killing fluid stratum of bleeding in a large number from causing reservoir damage, reach the purpose of safe and effective quick well workover and reservoir protection.
This method realizes by adopting following technical proposals:
A kind of applied chemistry gel carries out the method for oil gas well well workover, it is characterized in that: by the annular space of the flow string in the oil gas well, or the annular space between flow string and well inner sleeve injects gel in well, gel forms one section gel slug that can stop workover fluid to drain to payzone and stop natural gas overflow in well in the shaft bottom.
This gel adopts existing oil field compression fracture guanidine glue, is aided with glutaraldehyde and sodium sulfite and makes biological bactericide and the oxygen scavenger temperature resistance ability with the raising gel rubber system respectively.
The flow resistance of described gel is higher than the flow resistance of the gas stream in workover fluid and the payzone, and has the anti-gas channeling ability, and the gel slug is long more, and it is big more to hinder the mobile resistance of oil gas.
The length of gel slug requires to regulate according to workover treatment, and the length of gel slug is directly proportional with the flow resistance that it is produced.
With publication number is that the prior art of CN1687557 representative is compared, and the technique effect that the present invention produced is as follows:
1, this method applied chemistry gel carries out the well workover of oil gas well, in pit shaft, form one section gel slug, fluid in the temporary transient packing stratum, prevent to scurry out on the formation fluid (as: gas) and cause blowout, can prevent again that simultaneously the well killing fluid stratum of bleeding in a large number from causing reservoir damage, reach the purpose of safe and effective quick well workover and reservoir protection;
2, simultaneously, the flow resistance of gel is higher than the flow resistance of the gas stream in workover fluid and the payzone, so just can guarantee further that gel can form gel slug, the fluid in the packing stratum fast fast in pit shaft, prevent to scurry on the gas formation blowout, thoroughly avoided this type of accident to take place.
3, the length of gel slug requires to regulate according to workover treatment, the length of gel slug is directly proportional with the flow resistance that it is produced, adopt such scheme, length according to flow resistance calculating place gel slug, and the bearing capacity difference of the gel slug of different length, so just can regulate the length of gel slug, under the prerequisite of strict guarantee bearing capacity, save cost of production, guarantee accurate construction according to the requirement of workover treatment.
4, the present invention is applicable to that the oil gas well is at exploitation middle and later periods, the well that need carry out workover treatment.The present invention has the unique technique advantage, can effectively guarantee workover treatment safety, has easy construction simultaneously, operating cost is low, and good application prospects is arranged.Only the area, Sichuan has more than 3000 mouthful of low-pressure gas well to need workover treatment (As time goes at present, need the low pressure oil gas well of workover treatment will be more), owing to there was not the tubing packer technology, carry out well workover after having only pressured well, cause reduce or stop production after the well workover.The present invention will work to be tubing packer, break external technical monopoly, and more oil gas well is resumed production.
Description of drawings
The present invention is described in further detail below in conjunction with specification drawings and specific embodiments, wherein:
Fig. 1 is in different tube diameters, the bearing capacity figure of the gel slug under the different length.
The specific embodiment
The invention discloses the method that a kind of applied chemistry gel carries out the well workover of oil gas well, in well, inject a certain amount of gel by flow string (also claiming tubing string) in the oil gas well (the particularly natural gas well) or the annular space between flow string and well inner sleeve, because the flow resistance of this gel is much higher than the gas stream in workover fluid and the payzone, gel can form one section gel slug in the shaft bottom, and has anti-gas channeling ability (preventing the ability of gas penetration), the gel slug is long more, and it is big more to hinder the mobile resistance of oil gas.This gel slug can require to regulate according to workover treatment, as long as gel slug long enough will produce enough flow resistances, workover fluid also just can not drain to payzone, has also just avoided workover fluid injury payzone; On the other hand, natural gas also just can not overflow in well, has also just avoided blowout.After well workover finished, the method for the broken glue of available chemistry allowed the gel slug break glue, and the liquid that will break behind the glue with the method for gaslift circulates out again, and maintenance payzone oil gas is communicated with pit shaft.
This gel adopts existing oil field compression fracture guanidine glue, is aided with glutaraldehyde and sodium sulfite and makes biological bactericide and the oxygen scavenger temperature resistance ability with the raising gel rubber system respectively.
As liquid packer, both can prevent blowout with gel plug, and can avoid workover fluid to bleed payzone and injure oil-gas Layer again.For example:
In different tube diameters, the bearing capacity of the gel slug under the different length as shown in Figure 1:
Be applied in the instantiation: LN-5 well, well depth 3210m, reservoir pressure coefficient 0.67MPa/100, casing size are 5in (internal diameter 102.7mm).If consider safety guarantee, additional 20% coefficient, then injecting gel plug length is 516m, so just can carry out workover treatment safely.
Claims (4)
1. method that the applied chemistry gel carries out the well workover of oil gas well, it is characterized in that: by the annular space of the flow string in the oil gas well, or the annular space between flow string and well inner sleeve injects gel in well, gel forms one section gel slug that can stop workover fluid to drain to payzone and stop natural gas overflow in well in the shaft bottom.
2. applied chemistry gel according to claim 1 carries out the method for oil gas well well workover, it is characterized in that: this gel adopts existing oil field compression fracture guanidine glue.
3. applied chemistry gel according to claim 1 and 2 carries out the method for oil gas well well workover, it is characterized in that: the applied chemistry gel carries out the method for oil gas well well workover, it is characterized in that: the flow resistance of described gel is higher than the flow resistance of the gas stream in workover fluid and the payzone.
4. applied chemistry gel according to claim 1 and 2 carries out the method for oil gas well well workover, it is characterized in that: the length of gel slug requires to regulate according to workover treatment, and the length of gel slug is directly proportional with the flow resistance that it is produced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102645474A CN101949272A (en) | 2010-08-26 | 2010-08-26 | Method for repairing oil and gas well by using chemical gel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102645474A CN101949272A (en) | 2010-08-26 | 2010-08-26 | Method for repairing oil and gas well by using chemical gel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101949272A true CN101949272A (en) | 2011-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102645474A Pending CN101949272A (en) | 2010-08-26 | 2010-08-26 | Method for repairing oil and gas well by using chemical gel |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108071359A (en) * | 2017-12-28 | 2018-05-25 | 长江大学 | Damaged casing is resident the method and retained gel of reparation in a kind of oil/gas well |
| CN108949120A (en) * | 2017-05-24 | 2018-12-07 | 中石化石油工程技术服务有限公司 | A kind of drilling fluid invades material and its preparation method and application with high temperature gas reservoir gas-tight |
| CN112096335A (en) * | 2020-09-05 | 2020-12-18 | 西南石油大学 | Shaft isolation method based on ionic liquid rubber plug |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047686A (en) * | 1990-04-06 | 1990-12-12 | 渤海石油公司钻井公司 | The agent of high temperature resistance completion temporary blocking |
| CN1182112A (en) * | 1997-10-17 | 1998-05-20 | 长庆石油勘探局钻采工艺研究院 | Liquid gum plug packing agent |
| US20050211435A1 (en) * | 2004-03-26 | 2005-09-29 | Terry Monroe | Method of forming temporary blocking gel containing guar derivative |
| CN101086210A (en) * | 2007-07-13 | 2007-12-12 | 辽河石油勘探局 | Profile control and water plugging technology for coal bed gas |
| CN101135237A (en) * | 2007-10-17 | 2008-03-05 | 吐哈石油勘探开发指挥部工程技术研究院 | Method for preparing down-hole gel valve and construction method thereof |
| US7572757B1 (en) * | 2004-07-19 | 2009-08-11 | Bj Services Company | Method of treating a well with a gel stabilizer |
-
2010
- 2010-08-26 CN CN2010102645474A patent/CN101949272A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047686A (en) * | 1990-04-06 | 1990-12-12 | 渤海石油公司钻井公司 | The agent of high temperature resistance completion temporary blocking |
| CN1182112A (en) * | 1997-10-17 | 1998-05-20 | 长庆石油勘探局钻采工艺研究院 | Liquid gum plug packing agent |
| US20050211435A1 (en) * | 2004-03-26 | 2005-09-29 | Terry Monroe | Method of forming temporary blocking gel containing guar derivative |
| US7572757B1 (en) * | 2004-07-19 | 2009-08-11 | Bj Services Company | Method of treating a well with a gel stabilizer |
| CN101086210A (en) * | 2007-07-13 | 2007-12-12 | 辽河石油勘探局 | Profile control and water plugging technology for coal bed gas |
| CN101135237A (en) * | 2007-10-17 | 2008-03-05 | 吐哈石油勘探开发指挥部工程技术研究院 | Method for preparing down-hole gel valve and construction method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 鲁亿等: "井下聚合堵漏技术研究", 《钻井液与完井液》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108949120A (en) * | 2017-05-24 | 2018-12-07 | 中石化石油工程技术服务有限公司 | A kind of drilling fluid invades material and its preparation method and application with high temperature gas reservoir gas-tight |
| CN108071359A (en) * | 2017-12-28 | 2018-05-25 | 长江大学 | Damaged casing is resident the method and retained gel of reparation in a kind of oil/gas well |
| CN108071359B (en) * | 2017-12-28 | 2020-03-06 | 长江大学 | Method for resident repair of damaged casing in oil and gas well and resident gel |
| CN112096335A (en) * | 2020-09-05 | 2020-12-18 | 西南石油大学 | Shaft isolation method based on ionic liquid rubber plug |
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Application publication date: 20110119 |