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An elastic gel water blocking agent and its preparation method

An elastic gel and water blocking agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high ground viscosity and poor blocking effect, and achieve easy pumping, good colloidal stability, long-term effect

Active Publication Date: 2019-01-29
大庆市杰森钻采助剂厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention is to overcome the problem that existing selective water shutoff agents in the background technology have high ground viscosity and poor plugging effect, and provide an elastic gel water shutoff agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] First, dissolve 0.5g of the polymerization inhibitor hydroquinone monomethyl ether with 20g of hot water at 50°C, and dissolve 2.5g of the initiator sodium persulfate with 10g of water; then dissolve 15g of acrylamide monomer and 50g of accelerator Water glass, 2.5g colloidal stabilizer anhydrous sodium bisulfite, 2.5g crosslinking agent methylenebisacrylamide, 2.5g retarder anhydrous calcium chloride, 2.0g chelating agent tetrasodium edetate After adding 392.5g of water to dissolve, add the dissolved polymerization inhibitor, and finally add the initiator, stir evenly to obtain 500g of product; the apparent viscosity of the base liquid is 1.0mPa·s when tested with a rotational viscometer. Then the product was put into an oven at 50°C for reaction, and the gelation time was tested for 6 hours, and the gelation viscosity was 45400 mPa·s.

Embodiment 2

[0012] First, dissolve 0.6g of the polymerization inhibitor hydroquinone monomethyl ether with 20g of hot water at 50°C, and dissolve 3.0g of the initiator sodium persulfate with 10g of water; Water glass, 2.5g colloidal stabilizer anhydrous sodium bisulfite, 3.0g crosslinking agent methylenebisacrylamide, 2.5g retarder anhydrous calcium chloride, 2.0g chelating agent tetrasodium edetate After adding 376.4g of water to dissolve, add the dissolved polymerization inhibitor, and finally add the initiator, stir evenly, and obtain 500g of product. The apparent viscosity of the base fluid was measured with a rotational viscometer to be 2.0 mPa·s. Then the product was put into an oven at 50°C for reaction, and the gelation time was tested for 3 hours, and the gelation viscosity was 77806 mPa·s.

[0013] The thermal stability of the gel system of the elastic gel water blocking agent prepared in Example 1-2 above can be stable for 24 months at 50°C. It can effectively block the fluid...

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Abstract

The invention relates to an elastogel water shutoff agent and a preparation method thereof and mainly solves the problem that an existing selective water shutoff agent has large ground viscosity and a poor plugging effect. The elastogel water shutoff agent is characterized by being prepared from the following ingredients in percentage by weight: 2 to 5% of acrylamide monomer, 5 to 15% of adhesion improving agent, 0.05 to 0.15% of polymerization inhibitor, 0.3 to 0.6% of colloidal stabilizer, 0.3 to 0.6% of cross-linking agent, 0.2 to 1.0% of retarder, 0.2 to 1.0% of initiator, 0.2 to 0.5% of chelating agent and the balance of water. The invention further provides the preparation method of the elastogel water shutoff agent. The preparation method comprises the steps of firstly dissolving polymerization inhibitor of hydroquinone monomethyl ether with 45 to 55 DEG C hot water and dissolving initiator of sodium persulfate with clean water; then sequentially adding the acrylamide monomer, the adhesion improving agent, the colloidal stabilizer, the cross-linking agent, the retarder and the chelating agent into water to be dissolved, adding the dissolved polymerization inhibitor and finally adding the initiator to obtain a product. The elastogel water shutoff agent has small ground viscosity, high colloidal strength, good colloidal stability, a long plugging validity period and a good plugging effect.

Description

technical field [0001] The invention relates to a treatment agent in the field of oil recovery technology, in particular to an elastic gel water blocking agent and a preparation method thereof. Background technique [0002] At present, oilfield reservoirs are in the stage of ultra-high water cut, with large liquid production, obvious water channeling, high degree of water washing on the mainstream line, prominent contradictions between planes and interlayers, and due to the discontinuous distribution of interlayers in layers, the implementation of mechanical water shutoff technology cannot be effective For plugging, chemical water plugging is urgently needed to block the main layer of high-pressure fluid production, reduce the volume of fluid production, and alleviate plane conflicts. According to the clogging effect of water shutoff agent on oil layer and water layer, chemical water shutoff can be divided into non-selective water shutoff and selective water shutoff. Non-se...

Claims

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Application Information

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IPC IPC(8): C09K8/512C09K8/508C09K8/516C08F220/56C08F222/38
CPCC08F220/56C09K8/5083C09K8/512C09K8/516C08F222/385
Inventor 周东材王映丽
Owner 大庆市杰森钻采助剂厂
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