CN1103129A - Oil well water-stopping agent of polyacrylamide - Google Patents
Oil well water-stopping agent of polyacrylamide Download PDFInfo
- Publication number
- CN1103129A CN1103129A CN 93120206 CN93120206A CN1103129A CN 1103129 A CN1103129 A CN 1103129A CN 93120206 CN93120206 CN 93120206 CN 93120206 A CN93120206 A CN 93120206A CN 1103129 A CN1103129 A CN 1103129A
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- CN
- China
- Prior art keywords
- polyacrylamide
- thiourea dioxide
- water
- agent
- oil well
- 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.)
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Abstract
The component of the invented agent consists of (by weight percentage) non ionic polyacrylamide (molecular weight 3000-12000 thousand) 0.4-0.7, potassium (sodium) dichronate 0.02-0.50, thiourea dioxide 0.02-1.00, retarder 0.02-0.08 and water residue. The advantage of said invention lies in that the thiourea dioxide is adopted as reducer whose reducing potential is high and releasing reducing power is strong, so that the gumming time is short, meanwhile the thiourea dioxide cross-linking system is not esnsitive to the reaction of 0-2% calcium magnesium ions. Said water plugging agent features stable gumming system, high strength of coagulation and unnecessary to regulate pH value.
Description
The present invention relates to a kind of oil well high polymer water shutoff agent, particularly oil well water-stopping agent of polyacrylamide.
In the prior art, polyacrylamide is a lot of as the kind of oilwell water shutoff agent, as RUSSP 1239140, this sealing agent composition comprises (by Wt%): the polyacrylamide 0.14-0.20 that contains the carboxyl group of 0.5-1.9%, alkali metal dichromate 0.14-0.20, Sodium Thiosulfate 0.11-0.15 and water 99.45-99.61.The initial viscosity of this synthetic is 19-22S, is increased to 60-110S after 12 hours.Stir after 5 minutes, the viscosity of this solution is 19-22S, stop to stir 12 hours after, be increased to 60-108S again.In this sealing agent, the reducing agent Sodium Thiosulfate discharge reducing power a little less than, so gelation time is longer.And for example the SU167075 of the former Soviet Union provides a kind of drilling mud, and this drilling mud contains (by Wt%): contain the polyacrylamide 0.14-0.20 of 0.5-1.9Wt%COOH group, alkali dichromate 0.14-0.20, sodium dithionite 0.11-0.15, NH
4Cl0.05-0.5, water are remaining quota.Wherein ammonium chloride is used to increase viscosity.This sealing agent can only produce floccule, and glue connection intensity is little, and is bad to the plugging effect on stratum.Above-mentioned oilwell water shutoff agent simultaneously all is to be cross-linked to form gel with OR, adopts chromium ion and other oxidant and reducing agent to carry out displacement reaction, and dosage of crosslinking agent is bigger, and is relatively more responsive to divalent ion, therefore, influences the water blockoff success rate.
The purpose of this invention is to provide the oil well water-stopping agent of polyacrylamide that a kind of, gel rubber system insensitive to divalent ion is stable, gel strength is high.
As crosslinking agent, it consists of (in Wt%) to the present invention's employing with thiourea dioxide:
Non-ionic polyacrylamide: 0.4-0.7(molecular weight 300-1200 ten thousand):
Potassium bichromate (sodium): 0.02-0.50;
Thiourea dioxide: 0.02-1.00;
Retarding agent: 0.02-0.08;
The surplus quota is a water.
Advantage of the present utility model is: 1, thiourea dioxide is as reducing agent, its reduction potential height, and it is strong to discharge reducing power, so gelation time is short; 2, the thiourea dioxide cross-linking system is insensitive to calcium, the magnesium ion reaction of 0-2%; 3, become colloid system stable, the gel strength height; 4, this water shutoff agent does not need to transfer pH value.
Embodiment (in Wt%):
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Non-ionic polyacrylamide | 0.40 | 0.55 | 0.70 |
| Potassium bichromate (sodium) | 0.02 | 0.20 | 0.50 |
| Thiourea dioxide | 0.02 | 0.20 | 1.00 |
| Retarding agent | 0.02 | 0.04 | 0.08 |
| The surplus quota | Water | Water | Water |
| Gelation time | 2.4h | 8h | 11.3h |
| Gel strength | 0.33 | 0.42 | 0.27 |
Retarding agent among the embodiment is three ethanol or tartaric acid or sodium potassium tartrate tetrahydrate.The solid effective content of non-ionic polyacrylamide is more than 95%.Gel strength=glass marble (12 gram)/test tube total length.
Preparation method of the present invention is: 1, by the some sides of the preparation non-ionic polyacrylamide solution of the concentration in the prescription, be divided into halves after the dissolving fully, respectively potassium bichromate (sodium) and thiourea dioxide required to add fully dissolving in above-mentioned two preparing tanks in proportion.2, will get final product in the wherein any solution of retarding agent adding, distinguish roping then to the job site; 3, at the scene in the construction, clamp-on target zone after respectively the solution pump in two containers being delivered to threeway place mixing with two pump trucks, the pumping ratio is 1: 1.
Claims (2)
1, a kind of polyacrylamide oilwell water shutoff, its composition comprises (by Wt%):
Non-ionic polyacrylamide: 0.4-0.7 (molecular weight 300-1200 ten thousand);
Potassium bichromate (sodium): 0.02-0.50;
Thiourea dioxide: 0.02-1.00;
Retarding agent: 0.02-0.08;
The surplus quota is: water.
2, oil well water-stopping agent of polyacrylamide according to claim 1, its feature is three ethanol in described retarding agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93120206A CN1046151C (en) | 1993-11-26 | 1993-11-26 | Oil well water-stopping agent of polyacrylamide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93120206A CN1046151C (en) | 1993-11-26 | 1993-11-26 | Oil well water-stopping agent of polyacrylamide |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1103129A true CN1103129A (en) | 1995-05-31 |
| CN1046151C CN1046151C (en) | 1999-11-03 |
Family
ID=4993194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93120206A Expired - Fee Related CN1046151C (en) | 1993-11-26 | 1993-11-26 | Oil well water-stopping agent of polyacrylamide |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1046151C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101435317B (en) * | 2008-12-12 | 2012-05-23 | 中国石油集团川庆钻探工程有限公司 | Loss return drop-out cross linked gel plugging process |
| RU2483194C1 (en) * | 2011-12-12 | 2013-05-27 | Открытое акционерное общество "Татнефть" имени В.Д. Шашина | Method for limiting water influx in well |
| CN103321606A (en) * | 2013-07-02 | 2013-09-25 | 中国石油集团川庆钻探工程有限公司 | Low-permeability fractured reservoir oil well water-plugging and screening method |
| CN103498643A (en) * | 2013-10-23 | 2014-01-08 | 天津亿利科能源科技发展股份有限公司 | Composite slug deep water plugging method for oil pool with high water content |
| CN116042200A (en) * | 2022-12-23 | 2023-05-02 | 中国水利水电第七工程局成都水电建设工程有限公司 | Delay crosslinking water shutoff gel |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1239140A1 (en) * | 1983-12-26 | 1986-06-23 | Южное Производственное Геологическое Объединение "Южгеология" | Compound for flushing boreholes in absorbing formations |
| US4865129A (en) * | 1986-12-24 | 1989-09-12 | American Cyanamid Company | High temperature profile modification agents and methods for using same |
| SU1730432A1 (en) * | 1989-02-24 | 1992-04-30 | Всесоюзный научно-исследовательский и проектный институт по креплению скважин и буровым растворам | Gel compound for downhole isolation jobs |
-
1993
- 1993-11-26 CN CN93120206A patent/CN1046151C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101435317B (en) * | 2008-12-12 | 2012-05-23 | 中国石油集团川庆钻探工程有限公司 | Loss return drop-out cross linked gel plugging process |
| RU2483194C1 (en) * | 2011-12-12 | 2013-05-27 | Открытое акционерное общество "Татнефть" имени В.Д. Шашина | Method for limiting water influx in well |
| CN103321606A (en) * | 2013-07-02 | 2013-09-25 | 中国石油集团川庆钻探工程有限公司 | Low-permeability fractured reservoir oil well water-plugging and screening method |
| CN103321606B (en) * | 2013-07-02 | 2016-05-04 | 中国石油集团川庆钻探工程有限公司 | A kind of Fracture with low permeability oil reservoir oilwell water shutoff screen method |
| CN103498643A (en) * | 2013-10-23 | 2014-01-08 | 天津亿利科能源科技发展股份有限公司 | Composite slug deep water plugging method for oil pool with high water content |
| CN103498643B (en) * | 2013-10-23 | 2016-05-25 | 天津亿利科能源科技发展股份有限公司 | A kind of composite slug deep shutoff method for high water-cut reservoir |
| CN116042200A (en) * | 2022-12-23 | 2023-05-02 | 中国水利水电第七工程局成都水电建设工程有限公司 | Delay crosslinking water shutoff gel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1046151C (en) | 1999-11-03 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |