Water-absorbent resin temporary plugging agent and preparation method thereof

A technology of water-absorbing resin and temporary plugging agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems that the plugging agent can hardly meet the functions of acidification and plugging removal and deformation filling, and achieve high toughness and strength, Good adaptability, good acid solubility effect

Inactive Publication Date: 2015-03-25
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a water-absorbing resin temporary plugging agent in order to overcome the technical problems that the existing plugging materials are difficult to meet the technical problems of reservoir plugging, which can be acidified to remove plugging and deform and fill.

Method used

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  • Water-absorbent resin temporary plugging agent and preparation method thereof
  • Water-absorbent resin temporary plugging agent and preparation method thereof
  • Water-absorbent resin temporary plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Add 10.35g of AMPS, 35.54g of AM, and 0.15g of N,N-methylenebisacrylamide into 100g of clear water, fully dissolve, then add 35g of bluestone powder, stir well and adjust the pH to 9 with aqueous sodium hydroxide solution; stir Add 0.027g potassium persulfate and 0.01g sodium sulfite under the condition of raising the temperature to 35°C, and let it stand to react for 2 hours; take out the product, dry it at 100°C, and granulate it to obtain a water-absorbent resin temporary plugging agent, whose structural formula is:

[0020]

Embodiment 2

[0021] Example 2: Add 14.212gAA, 7.108gAM, 0.15gN, N-methylenebisacrylamide into 100g of clear water to fully dissolve, then add 20g of superfine calcium carbonate, stir well and adjust the pH to 11 with aqueous sodium hydroxide solution Add 0.046g of ammonium persulfate and 0.021g of sodium bisulfite to 65°C with stirring, and let it stand for 4 hours; take out the product, dry it at 110°C, and granulate it to obtain a water-absorbent resin temporary plugging agent, whose structural formula is :

[0022]

Embodiment 3

[0023] Example 3: 10.35g AMPS, 2.13gAM, 3.97gN-N-dimethylacrylamide, 3.03gN,N-diethylacrylamide; 0.15gN,N-methylenebisacrylamide were added to 100g of clear water, Fully dissolve, then add 10 parts of bluestone powder and 15g of superfine calcium carbonate, stir well and adjust the pH to 10 with aqueous sodium hydroxide solution; add 0.041g of potassium persulfate and 0.02g of sodium sulfite when the temperature is raised to 65°C under stirring conditions, Stand to react for 3 hours; take out the product, dry at 105°C, and granulate to obtain a water-absorbent resin temporary plugging agent, whose structural formula is:

[0024]

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Abstract

The invention relates to a water-absorbent resin temporary plugging agent and a preparation method thereof, belongs to the technical field of oilfield chemistry, and in particular relates to a petroleum drilling plugging agent. The water-absorbent resin temporary plugging agent is prepared by performing aqueous solution polymerization reaction on an acrylic acid monomer A, an acrylamide monomer B, a powdery acid-soluble inorganic filling material C and a crosslinking agent in the presence of an oxidization-reduction initiating system; the obtained gel-like product is pelletized and dried to obtain the water-absorbent resin temporary plugging agent for drilling solutions. The water-absorbent resin temporary plugging agent has acid solubility of more than 85 percent in 15 percent hydrochloric acid, temperature resistance of 150 DEG C, saturated water absorption capacity of 5-8 times and high self-adaption ability for leaking channels with different shapes and different sizes, and is high in toughness; moreover, the tensile elongation rate is up to 800-1,200 percent, and the tensile breaking strength is up to more than 2MPa. The water-absorbent resin temporary plugging agent is applied to plugging in a drilling and completion process, in particular to a reservoir drilling and completion process, and plugging of leaking reservoirs with different well depths under a hypersalinity condition.

Description

technical field [0001] The invention relates to a water-absorbing resin temporary plugging agent and a preparation method thereof, in particular to an oil drilling plugging agent, which belongs to the technical field of oil field chemistry. Background technique [0002] In the exploration and development of oil and gas, a large amount of drilling fluid or plugging slurry invades the oil and gas layer and the adjacent formation, which will seriously pollute the production layer and increase the comprehensive loss caused by lost circulation. At present, bridging materials and conventional oil well cement are still used to treat lost circulation mainly. Conventional bridge plugging materials have difficulty in particle size gradation, and the formed plugging layer is not dense, and the plugging effect is not ideal, and most of them cannot be acidified to remove plugging, so it is not suitable Production layer plugging. [0003] Water-absorbing resin (Super Absorbent Polymer, S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C08F220/58C08F220/06C08F220/56C08F220/54C08F4/40
CPCC08F4/40C08F220/06C08F220/56C08F220/58C08F220/585C09K8/512C09K2208/18C08F222/385C08F220/54
Inventor 李旭东姜雪清刘云飞刘昱彤耿晓慧
Owner CHINA PETROCHEMICAL CORP
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