Compound plugging agent for oil well water control and preparation method of compound plugging agent

A water-use and plugging agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of water injection development in old oilfields that cannot realize water control, and achieve the effect of improving development benefits and reducing production costs

Inactive Publication Date: 2015-03-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The plugging agent has a large particle size and can achieve temporary plugging of fracturing, but it cannot achieve the purpose of post-measure water control for water injection development of old oilfields

Method used

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  • Compound plugging agent for oil well water control and preparation method of compound plugging agent
  • Compound plugging agent for oil well water control and preparation method of compound plugging agent
  • Compound plugging agent for oil well water control and preparation method of compound plugging agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The present invention consists of the following materials in parts by weight:

[0018]

[0019]

[0020] A preparation method of a nano (micro) meter-scale water control composite temporary plugging agent: the preparation method is to mix the above-mentioned dosage, add water to the reaction kettle, add acrylic acid and N,N-methylenebis Acrylamide, under stirring conditions until it is completely dissolved, slowly add montmorillonite, after it is evenly dispersed, start to drop ferrous ammonium sulfate and hydrogen peroxide, react at room temperature for 1 hour, and finally add sodium hydroxide to neutralize The obtained flocs are centrifugally dried and become micron-sized water shutoff agents.

Embodiment 2

[0022] The present invention consists of the following materials in parts by weight:

[0023]

[0024] A preparation method of a nano (micro) meter-scale water control composite temporary plugging agent: the preparation method is to mix the above-mentioned dosage, add water to the reaction kettle, add acrylic acid and N,N-methylenebis Acrylamide, under stirring conditions until it is completely dissolved, slowly add kaolin, after it is uniformly dispersed, start to drop ferrous ammonium sulfate and hydrogen peroxide, react at room temperature for 1 hour, and finally add sodium hydroxide to neutralize, The obtained flocs are centrifugally dried and become the composite temporary plugging agent for nanometer (micro) water control.

Embodiment 3

[0026] The present invention consists of the following materials in parts by weight:

[0027]

[0028] A method for preparing a composite temporary plugging agent for controlling water at the nanometer (micro) level. N-methylenebisacrylamide and polyethylene glycol diacrylate are stirred until they are completely dissolved, then slowly add montmorillonite, and after they are uniformly dispersed, start to add ferrous ammonium sulfate and hydrogen peroxide dropwise, React at room temperature for 1 hour, and finally add sodium hydroxide to neutralize to neutrality. The resulting flocs are centrifuged and dried to become nano (micro) meter water control compound temporary plugging agent.

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Abstract

The invention relates to a compound plugging agent for oil well water control and a preparation method of the compound plugging agent. The preparation method comprises the following steps: adding water into a reactor, adding one or two of acrylic acid, N, N-methylenebisacrylamide and polyethylene glycol diacrylate while stirring until complete dissolution is achieved, slowly adding micron-sized granular montmorillonite or/and kaolin, after montmorillonite or/and kaolin is uniformly dispersed, dropwise adding ammonium ferrous sulfate and hydrogen peroxide, reacting for 1 hour at room temperature, finally adding sodium hydroxide for neutralizing to be neutral to obtain floccules and carrying out centrifugal drying on the floccules to obtain a nano(micro)-sized water-control compound temporary plugging agent. The temporary plugging agent can be used as a water-control temporary plugging agent in refracturing, plug removal and acidizing measures of old oilfields subjected to waterflooding development, the temporary plugging agent is injected from the oil well of which the moisture content is 20-40% to plug dominant waterflooding channels in medium-moisture-content and high-moisture-content oil wells and thus the purpose of measure water control in the medium-moisture-content and high-moisture-content oil wells is achieved.

Description

technical field [0001] The invention relates to a composite plugging agent for oil well water control and a preparation method thereof. Background technique [0002] In the initial stage of development, low-permeability oilfields generally underwent fracturing and achieved good development results. At present, most of the major oilfields have entered the medium-high water-cut development stage. Refracturing, plugging removal and acidizing technologies are important measures for the comprehensive management of water control and oil increase in old oilfields. Repeated fracturing, plugging removal and acidification have been successfully performed on medium-high water-cut wells. It is of great practical significance to solve the problem of repeated measures to tap the potential of medium and high water-cut oilfields. For this reason, a nano (micro) meter-scale composite plugging agent for oil well water control has been developed, and it strives to achieve repeated fracturing, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C08F220/06C08F220/54C08F283/06C08K3/34
Inventor 吕宝强慕立俊赵振峰李宪文卜向前庞鹏李向平李转红达引朋苏良银刘静刘兴银
Owner PETROCHINA CO LTD
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