Acid-resistant strong gel plugging agent and preparation method thereof

A strong gel and plugging agent technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of low acid resistance of plugging agents, and achieve the effects of strong plugging performance, not easy to dehydrate, and wide sources

Active Publication Date: 2020-03-10
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the acid resistance of plugging agents researched and developed in my country is generally not high, especially the research on acid-resistant strong gel plugging agents suitable for combined operation of water plugging and acidification in low permeability reservoirs is almost blank

Method used

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  • Acid-resistant strong gel plugging agent and preparation method thereof
  • Acid-resistant strong gel plugging agent and preparation method thereof
  • Acid-resistant strong gel plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] An acid-resistant strong gel plugging agent, in terms of weight percentage, its components are:

[0038] Main agent: 3-10%;

[0039] Acid resistant monomer: 0.1-1.0%;

[0040] Initiator: 0.1-0.5%;

[0041] Cross-linking agent: 0.5%-1.5%.

[0042] An acid-resistant strong gel plugging agent is prepared by the following method, comprising the following steps

[0043] Step 1: Take the main ingredient of the formula first, put it in a heat-resistant HDPE bottle, put the heat-resistant HDPE bottle on a magnetic stirrer, and stir evenly.

[0044] Step 2: On the basis of Step 1, add the formula amount of acid-resistant monomer, and stir until it is uniform and transparent.

[0045] Step 3: On the basis of Step 2, add a crosslinking agent and an initiator, stir evenly, and place the evenly stirred solution in a constant temperature oven to form a gel.

Embodiment 2

[0047] An acid-resistant strong gel plugging agent, in terms of weight percentage, its components are:

[0048] Main ingredient: 3%;

[0049] Acid resistant monomer: 0.1%;

[0050] Initiator: 0.1%;

[0051] Cross-linking agent: 0.5%.

[0052] The main agent is one of acrylamide, acrylonitrile and acrylic acid or a mixture thereof.

[0053] The acid-resistant monomers are acrylic esters containing fluorine groups.

[0054] The initiator is one of potassium persulfate, ammonium persulfate and azobisisobutyronitrile or a mixture thereof.

[0055] The crosslinking agent is one of N,N-methylenebisacrylamide and polyethyleneimine or a mixture thereof.

[0056] An acid-resistant strong gel plugging agent is prepared by the following method, comprising the following steps

[0057] Step 1: Take 3% acrylonitrile first, put it in a heat-resistant HDPE bottle, place the heat-resistant HDPE bottle on a magnetic stirrer, and stir evenly.

[0058] Step 2: On the basis of Step 1, add 0...

Embodiment 3

[0062] An acid-resistant strong gel plugging agent, in terms of weight percentage, its components are:

[0063] Main agent: 10%; the main agent is acrylic acid;

[0064] Acid-resistant monomer: 1.0%; the acid-resistant monomer is fluorohexyl ethyl acrylate;

[0065] Initiator: 0.5%; the initiator is azobisisobutyronitrile;

[0066] Cross-linking agent: 1.5%; the cross-linking agent is a mixture of N,N-methylenebisacrylamide and polyethyleneimine.

[0067] An acid-resistant strong gel plugging agent is prepared by the following method, comprising the following steps

[0068] Step 1: first take 10% acrylic acid, put it in a heat-resistant HDPE bottle, place the heat-resistant HDPE bottle on a magnetic stirrer, and stir evenly.

[0069] Step 2: On the basis of Step 1, add 1.0% ethyl fluorohexyl acrylate, and stir until uniform and transparent.

[0070]Step 3: On the basis of step 2, add 1.5% of a mixture of N,N-methylenebisacrylamide and polyethyleneimine and 0.5% of azobisis...

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Abstract

The invention relates to the technical field of oil well water plugging used in oil exploitation, in particular to an acid-resistant strong gel plugging agent and a preparation method thereof. The acid-resistant strong gel plugging agent comprises, by weight, 3-10% of a main agent, 0.1-1.0% of an acid-resistant monomer; 0.1%-0.5% of an initiator; and 0.5%-1.5% of a cross-linking agent. The acid-resistant strong gel plugging agent provided by the invention is simple in preparation method, wide in raw material source, strong in plugging performance and good in acid resistance, and provides a newtechnical reserve for a chemical profile control and water plugging technology.

Description

[0001] Technical field [0002] The invention relates to the technical field of oil well water plugging used in oil exploitation, in particular to an acid-resistant strong gel plugging agent and a preparation method thereof. Background technique [0003] During the development of low-permeability reservoirs, due to the influence of formation fractures and heterogeneity, coupled with fracturing and putting into production, it is very easy to cause water inflow after oil well measures, a large increase in water cut, and high water cut. The existence of these wells is serious. It will affect the production capacity of oil wells and the long-term stable production of oil fields. At present, the conventional water shutoff technology has problems such as failure to plug wells with high water cut or difficulty in increasing production after plugging, and has been unable to meet the needs of water control and production increase in such reservoirs. [0004] The combined operation of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/50
CPCC09K8/512C09K8/5083C09K8/50
Inventor 王玉功李勇武龙徐洋谢新秋邹鸿江万向辉徐杰唐冬珠杨发宋振云汪小宇金娜王所良蒋文学许伟星李珊贺华镭李雪李丹诗佳庆
Owner BC P INC CHINA NAT PETROLEUM CORP
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