CN1103885A - Graft polymer and its use for oil well or water well for sealing purpose - Google Patents
Graft polymer and its use for oil well or water well for sealing purpose Download PDFInfo
- Publication number
- CN1103885A CN1103885A CN 93121189 CN93121189A CN1103885A CN 1103885 A CN1103885 A CN 1103885A CN 93121189 CN93121189 CN 93121189 CN 93121189 A CN93121189 A CN 93121189A CN 1103885 A CN1103885 A CN 1103885A
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- CN
- China
- Prior art keywords
- plugging agent
- graftomer
- polymkeric substance
- acrylamide
- oil
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Abstract
The polymer is prepd. by copolymerization of by wt. percentage dextrin (0.01-0.50) with acrylamine (20-25) with addition of persulphate (0.001-0.20) under 40-60 deg.C and water as the rest. The oil-water well plugging process is: first step, a flocculating-plugging agent is obtd. by reaction of graft polymer with clay; second step, a gelatinizing-plugging agent is obtd. by reaction of graft polymer with clay and silicate; and third step, the flocculating-plugging is first pressed into the destination layer in section plug manner, and then the gelatinizing-plugging agent is pressed into its tail portion.
Description
The present invention relates to a kind of graftomer, particularly a kind of acrylamide graft polymkeric substance and be used for the technology of oil and water well shutoff.
In the prior art, hydro-polyacrylamide (HPAM) and clay reaction are mainly adopted in the clay profile control agent, produce cotton-shaped tamper, and shutoff most permeable zone and macropore leak.The floss absorption that this polyacrylamide homopolymer is generated is loose, easily is injected into water slug and resolves into smaller particles, and therefore, plugging strength is lower.
The acrylamide graft polymkeric substance and the technology of this polymer application that the purpose of this invention is to provide a kind of high adsorption capacity in oil, well shutoff.
Acrylamide graft polymkeric substance of the present invention is to form with acrylamide adding persulphate copolymerization under 40-60 ℃ by the lake is smart, and the prescription of this graftomer is (by Wt%):
Lake essence: 0.01-0.50;
Acrylamide: 20-25;
Persulphate: 0.001-0.20;
The surplus quota is a water.
The synthetic method of this polymkeric substance is (is example with an embodiment): the acrylamide solution of 20-25% is positioned in the stainless steel reactor, be warming up to 50 ℃, the lake essence of adding 0.2% in above-mentioned solution, under continuous condition of stirring, constant temperature 30 minutes, the persulphate (Sodium Persulfate or Potassium Persulphate) that adds 0.001-0.2%, after 6-10 minute, when observing the obvious thickening of polymer viscosity, under continuous condition of stirring, add an amount of sodium hydroxide, the pH value that makes polymkeric substance is placed hydrolysis in 1 to 3 day between 8.5-9.Resulting graftomer is a colloid, so closes the graftomer of colloidal is cut into 3 to 5 centimetres cubes with cutting machine, contains on the drip pan, sends into baking oven up to oven dry, and temperature of oven is controlled between 80-90 ℃.Graftomer solid after the oven dry obtains meal after pulverizing with pulverizer, that is, and and dextrin-acrylamide graft polymkeric substance.Its molecular weight is 300-400 ten thousand, and degree of hydrolysis is 15-20%, and effectively solids content is more than 95%.Above-mentioned lake essence can be obtained by the starch cracking, can use white lake essence, can also use yellow lake essence.
The technology that above-mentioned lake essence-poly-propionic acid amide graftomer is used for the oil and water well shutoff is: the first step, preparation flocculation plugging agent.With lake essence-acrylamide graft polymkeric substance and clay reaction, shutoff mud obtains flocculating.The consisting of of this mud (by Wt%):
Lake essence-acrylamide graft polymerization: 0.01-0.50;
Clay: 30-65;
The surplus quota is a water.
Second step, the preparation gel plugging agent.The consisting of of this gel plugging agent (by Wt%6):
Dextrin-acrylamide graft polymkeric substance: 0.2-0.5;
Clay: 45-65;
Silicate: 5-10;
The surplus quota is a water.
When this gel plugging agent of preparation, lake essence-acrylamide graft polymkeric substance also can be replaced by polyacrylamide and the poly-propionic acid amide of hydrolysis.
The 3rd step, the flocculation plugging agent that obtains in the first step clamp-oned a zone of interest 3-4 slug with the slug form after, clamp-on second gel plugging agent that obtains in going on foot at its afterbody.The ratio of flocculation plugging agent and gel plugging agent is 3: 2-4: 1.
The invention has the advantages that: 1, lake provided by the invention essence-acrylamide graft polymer itself also has adsorptivity because the lake is smart, so the absorption group of the graft polymers that itself and acrylamide synthesize is many, when this graft polymers came shutoff, the sealing agent intensity that generates was higher; 2, after the flocculation sealing agent that the reaction of lake essence-acrylamide and clay obtains squeezes target zone, drop into again gel plugging agent and can form the higher shutoff band of intensity, its gel is broken through pressure between 0.35-0.47MPa/cm, the permeability reduction degree is applicable to the shutoff of 20-80 ℃ of oil reservoir macropore, large fracture and high infiltration layer more than 99%.
Claims (8)
1, a kind of graftomer, particularly the acrylamide graft polymers closes, and this polymkeric substance mainly adopts dextrin and acrylamide to add the persulphate copolymerization down at 40-60 ℃ and forms, and its prescription is (by Wt%): dextrin: 0.01-0.50; Acrylamide: 20-25; Persulphate: 0.001-0.20; The surplus quota is a water.
2, graftomer according to claim 1, its feature add suitable sodium hydroxide in described prescription, the pH value of graftomer solution is adjusted between the 8.5-9;
3, graftomer according to claim 1 is characterized in that the molecular weight of described lake essence-acrylamide graft polymkeric substance is 300-400 ten thousand, and degree of hydrolysis is 15-20%.
4, graftomer is used for the technology of oil and water well shutoff according to claim 1, it is characterized in that:
The first step, preparation flocculation plugging agent.Dextrin-acrylamide graft polymkeric substance and clay are reacted the shutoff mud that obtains flocculating;
In second step, the preparation gel plugging agent gets gel plugging agent with lake essence-acrylamide graft polymkeric substance and clay, silicate reaction;
The 3rd step, the flocculation plugging agent that obtains in the first step clamp-oned a zone of interest 3-4 slug with the slug form after, clamp-on second gel plugging agent that obtains in going on foot at its afterbody.
5, graftomer according to claim 4 is used for the technology of oil and water well shutoff, it is characterized in that consist of (by the Wt%) of the flocculation plugging agent described in the first step:
Lake essence-acrylamide graft polymkeric substance: 0.01-0.50;
Clay: 30-65;
The surplus quota is a water.
6, graftomer according to claim 4 is used for the technology of oil and water well shutoff, it is characterized in that consist of (by the Wt%) of gel plugging agent described in second step:
Lake essence-acrylamide graft polymkeric substance: 0.2-0.5;
Clay: 45-65;
Silicate: 5-10;
The surplus quota is a water.
7, graftomer according to claim 6 is used for the technology of oil and water well shutoff, it is characterized in that the dextrin-acrylamide graft polymkeric substance in the described gel plugging agent prescription can be replaced by polyacrylamide or hydro-polyacrylamide.
8, graftomer according to claim 4 is used for the technology of oil and water well shutoff, it is characterized in that the flocculation plugging agent in the 3rd step and the ratio of clamp-oning of gel plugging agent are 3: 2-4: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93121189 CN1103885A (en) | 1993-12-17 | 1993-12-17 | Graft polymer and its use for oil well or water well for sealing purpose |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 93121189 CN1103885A (en) | 1993-12-17 | 1993-12-17 | Graft polymer and its use for oil well or water well for sealing purpose |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1103885A true CN1103885A (en) | 1995-06-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 93121189 Pending CN1103885A (en) | 1993-12-17 | 1993-12-17 | Graft polymer and its use for oil well or water well for sealing purpose |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1103885A (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 |
| CN102516963A (en) * | 2011-10-17 | 2012-06-27 | 中国石油天然气股份有限公司 | Chemical composite resin mounting agent for oil-water well casing restoration |
| CN104100224A (en) * | 2013-04-03 | 2014-10-15 | 中国石油天然气股份有限公司 | Oil well water plugging method |
| CN110628399A (en) * | 2018-06-22 | 2019-12-31 | 中国石油天然气股份有限公司 | Plugging agent for plugging cracks and plugging method thereof |
| CN111334265A (en) * | 2020-04-13 | 2020-06-26 | 西南石油大学 | Clay mineral nano hydrogel plugging agent and water-based drilling fluid |
-
1993
- 1993-12-17 CN CN 93121189 patent/CN1103885A/en active Pending
Cited By (8)
| 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 |
| CN102516963A (en) * | 2011-10-17 | 2012-06-27 | 中国石油天然气股份有限公司 | Chemical composite resin mounting agent for oil-water well casing restoration |
| CN102516963B (en) * | 2011-10-17 | 2013-07-31 | 中国石油天然气股份有限公司 | Chemical composite resin mounting agent for oil-water well casing restoration |
| CN104100224A (en) * | 2013-04-03 | 2014-10-15 | 中国石油天然气股份有限公司 | Oil well water plugging method |
| CN104100224B (en) * | 2013-04-03 | 2016-12-28 | 中国石油天然气股份有限公司 | A kind of oilwell water shutoff method |
| CN110628399A (en) * | 2018-06-22 | 2019-12-31 | 中国石油天然气股份有限公司 | Plugging agent for plugging cracks and plugging method thereof |
| CN110628399B (en) * | 2018-06-22 | 2022-02-01 | 中国石油天然气股份有限公司 | Plugging agent for plugging cracks and plugging method thereof |
| CN111334265A (en) * | 2020-04-13 | 2020-06-26 | 西南石油大学 | Clay mineral nano hydrogel plugging agent and water-based drilling fluid |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |