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Oil well compound plugging agent and preparation method thereof

A composite type, water blocking agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low durability, aging, low strength, etc., achieve good thixotropy and fluidity, and improve oil recovery Yield, the effect of simple preparation method

Inactive Publication Date: 2014-12-17
无棣华信石油技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large particles of oil well cement that cannot enter the micro-fracture channel, and the plugging radius is small, the success rate is only about 30%; the use of organic water blocking agents for plugging often has low durability and low strength due to its own properties. , serious aging phenomenon, high cost, limited use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A compound water shutoff agent for oil wells, comprising the following components in parts by weight:

[0020] 19 parts of acryloyloxyethyltrimethylammonium chloride, 1 part of N,N'-methylenebisacrylamide, 40 parts of N-isopropylacrylamide, 0.5 parts of sodium borohydride, 0.5 parts of methyl ethyl ketone peroxide, nano 5 parts of silicon dioxide, 1 part of nano-titanium dioxide, 2 parts of lignosulfonate, 20 parts of α-terpene alcohol, 0.5 part of sodium sulfide, and 1000 parts of water.

[0021] The preparation method of the above-mentioned composite water shutoff agent for oil wells comprises the following steps:

[0022] Step (1), in the reaction kettle, dissolve N-isopropylacrylamide in water, then add N,N'-methylenebisacrylamide and half of sodium borohydride to it, and stir at 5°C until it completely dissolved;

[0023] Step (2), add acryloyloxyethyltrimethylammonium chloride and methyl ethyl ketone peroxide into the reaction kettle, stir at 50°C for 20 minutes...

Embodiment 2

[0027] A compound water shutoff agent for oil wells, comprising the following components in parts by weight:

[0028] 22 parts of acryloyloxyethyltrimethylammonium chloride, 2 parts of N,N'-methylenebisacrylamide, 45 parts of N-isopropylacrylamide, 2 parts of sodium borohydride, 1 part of methyl ethyl ketone peroxide, nano 8 parts of silicon dioxide, 2 parts of nano-titanium dioxide, 3 parts of lignosulfonate, 30 parts of α-terpene alcohol, 1 part of sodium sulfide, and 1200 parts of water.

[0029] The preparation method of the above-mentioned composite water shutoff agent for oil wells comprises the following steps:

[0030] Step (1), in the reaction kettle, dissolve N-isopropylacrylamide in water, then add N,N'-methylenebisacrylamide and half of sodium borohydride to it, and stir at 10°C until it completely dissolved;

[0031] Step (2), add acryloyloxyethyltrimethylammonium chloride and methyl ethyl ketone peroxide to the reaction kettle, stir at 60°C for 30 minutes, let ...

Embodiment 3

[0035] A compound water shutoff agent for oil wells, comprising the following components in parts by weight:

[0036] 21 parts of acryloyloxyethyltrimethylammonium chloride, 1.5 parts of N,N'-methylenebisacrylamide, 44 parts of N-isopropylacrylamide, 0.8 parts of sodium borohydride, 0.9 parts of methyl ethyl ketone peroxide, nano 6 parts of silicon dioxide, 1.6 parts of nano-titanium dioxide, 2.5 parts of lignosulfonate, 28 parts of foaming agent, 0.7 parts of sodium sulfide, and 1100 parts of water.

[0037] The preparation method of the above-mentioned oil well composite water shutoff agent comprises the following steps:

[0038] Step (1), in the reaction kettle, dissolve N-isopropylacrylamide in water, then add N,N'-methylene bisacrylamide and half of sodium borohydride to it, and stir at 8°C until it completely dissolved;

[0039] Step (2), add acryloyloxyethyltrimethylammonium chloride and methyl ethyl ketone peroxide to the reactor, stir at 58°C for 25 minutes, let it ...

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Abstract

The invention relates to an oil well compound plugging agent and a preparation method thereof, and belongs to the technical field of oil exploitation. The plugging agent comprises the following components by weight: 19-22 parts of acryloyloxyethyl trimethyl ammonium chloride, 1-2 parts of N, N '-methylene bisacrylamide, 40-45 parts of N-isopropylacrylamide, 0.5-2 parts of sodium borohydride, 0.5-1 part of methyl ethyl ketone peroxide, 5-8 parts of nano silica, 1-2 parts of nano titanium dioxide, 2-3 parts of lignin sulfonate, 20-30 parts of a foaming agent, 0.5-1 part of sodium sulfide and 1000-1200 parts of water,. The oil well compound plugging agent is temperature resistant and salt tolerant, the various components are interactive, so that the oil well compound plugging agent has good thixotropy and good mobility, can quickly form network structures in micro cracks and small pores, and can be effectively trapped in a blocking layer; at the same time, the oil well compound plugging agent is simple in preparation method, can realize the reservoir deep profile section, and can be used to improve the oil recovery efficiency.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a compound water shutoff agent for oil wells and a preparation method thereof. Background technique [0002] In the process of oilfield exploitation, due to channeling of water layer, coning of bottom water or intrusion of water injection and edge water, some oil wells will see water prematurely or be flooded. In order to remove or reduce water flooding, control the flow of water in the water-producing layer and change the flow direction of water in water-flooding oil, and improve the recovery rate of water-flooding oil, the chemistry used to seal the water-producing layer on the production well or injection well The treatment agent is called water blocking agent. [0003] The currently used oil well water shutoff agents mainly include oil well cement water shutoff agents and organic water shutoff agents. However, due to the large particles of oil wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508
CPCC09K8/514C09K2208/18
Inventor 李瑞国
Owner 无棣华信石油技术服务有限公司
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