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Cross-linked particle plugging agent suitable for low-permeability reservoir high-water-cut horizontal well and preparation method of cross-linked particle plugging agent

A technology for horizontal wells and cross-linking agents, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of unsatisfactory water blocking effect of plugging agents, and achieve strong water blocking ability, good erosion resistance, good water blocking effect, etc. The effect of temperature resistance

Pending Publication Date: 2021-09-17
YANCHANG OIL FIELD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a cross-linked particle plugging agent suitable for high water-cut horizontal wells in low-permeability reservoirs, and to solve the problem that the existing plugging agents have unsatisfactory water plugging effects

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0032] The present invention provides a preparation method of a cross-linked granular plugging agent suitable for high water-cut horizontal wells in low-permeability reservoirs, which is specifically implemented according to the following steps:

[0033] Step 1: Add polyacrylamide and clay to normal temperature water, stir evenly, then add acrylamide and acrylic acid, stir evenly and let stand for 10 minutes to obtain reagent A;

[0034] Among them, the mass ratio of polyacrylamide, clay, water, acrylamide, and acrylic acid is 0.006:0.25:3:1:0.006;

[0035] Step 2, adding acrylic acid a into NaOH aqueous solution, stirring continuously until there is no gel, and standing for 5min to obtain reagent B;

[0036] The volume ratio of acrylic acid a and NaOH aqueous solution is 10:1; the saturation of NaOH aqueous solution is 0.75; the volume ratio of water and NaOH aqueous solution is 3:1;

[0037] Step 3: Mix the reagent A obtained in step 1 with the reagent B obtained in step 2,...

Embodiment

[0041] Step 1, add 0.3g of polyacrylamide and 12.5g of clay into 150ml of normal temperature water, stir well, then add 50g of acrylamide and 0.3g of acrylic acid, stir well and let stand for 10min to obtain reagent A;

[0042] Step 2, add 5ml of acrylic acid a to 50ml of 0.75 saturated NaOH aqueous solution, stir continuously until there is no gel, and leave it for 5min to obtain reagent B;

[0043] Step 3: Mix the reagent A obtained in step 1 with the reagent B obtained in step 2, stir until there is no precipitation, then add 0.1 g of ammonium persulfate and 0.1 g of N-N methylenebisacrylamide after standing for 3 minutes, and heat and stir at a constant temperature The instrument was heated and stirred in a water bath at 70°C for 5 minutes, and after the reaction was complete, a cross-linked particle blocking agent was obtained;

[0044] On-site implementation effect: Well X was put into production on October 2, 2012, and the average daily liquid production in the first 3 ...

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PUM

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Abstract

The invention discloses a cross-linked particle plugging agent suitable for a low-permeability reservoir high-water-cut horizontal well and a preparation method, the cross-linked particle plugging agent comprises a reagent A, a reagent B, an initiator and a cross-linking agent, the reagent A comprises polyacrylamide, clay, water, acrylamide and acrylic acid, and the reagent B comprises acrylic acid a and a NaOH aqueous solution; the preparation method is simple and easy to implement. The plugging agent solves the problem that an existing plugging agent is not ideal in water plugging effect.

Description

technical field [0001] The invention belongs to the technical field of profile control and water plugging, and relates to a cross-linked particle plugging agent suitable for high water content horizontal wells in low-permeability reservoirs, and also relates to a preparation method of the cross-linked particle plugging agent. Background technique [0002] After the oilfield development enters the middle and late stages, high water cut or rapid rise of water cut in horizontal wells is one of the common problems encountered, and the productivity loss is serious. Efficient water shutoff technology is of great significance to ensure the normal production of oil wells. At present, the most widely used water shutoff technology in major oilfields is the mechanical water shutoff method, which is complicated to operate, and the water shutoff effect cannot meet the treatment needs of this block. On the basis of mechanical water shutoff, it is necessary to further carry out two-way pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F265/10C08F292/00C08F220/56C08F220/06C08F222/38C09K8/508C09K8/512
CPCC08F265/10C08F292/00C09K8/512C09K8/5083C08F220/56C08F220/06C08F222/385
Inventor 艾先婷贺越王亚雄辛毅超马赞
Owner YANCHANG OIL FIELD