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Film-coated solid acid suitable for deep acid fracturing of carbonate reservoir

A carbonate reservoir and solid acid technology, which is applied in the direction of production fluid, drilling composition, wellbore/well components, etc., can solve the problems of corrosion inhibition and retardation, etc., and achieve corrosion inhibition Good performance, reduced reaction speed, and simple preparation process

Inactive Publication Date: 2020-08-07
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Later, a coated solid acid appeared. The solid hydrochloric acid, nitric acid, citric acid, etc. were wrapped with a coating material to isolate the solid acid from the carrier liquid. By controlling the solubility of the coating material, the solid acid was released under specific conditions. To achieve the purpose of acid penetration depth, but its corrosion inhibition, retardation and other performance is not ideal enough

Method used

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  • Film-coated solid acid suitable for deep acid fracturing of carbonate reservoir
  • Film-coated solid acid suitable for deep acid fracturing of carbonate reservoir
  • Film-coated solid acid suitable for deep acid fracturing of carbonate reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A film-coated solid acid suitable for deep acid fracturing in carbonate reservoirs, the preparation process of which is as follows:

[0028] 1) Add 50g of ethylene oxide, 30g of hydroxyethyl methacrylate, 10g of phthalimide, and 10g of pentaerythritol triallyl ether into an anhydrous and oxygen-free pressure bottle, and continue to add 150g of benzene, 10g of Diethyl zinc, seal, shake well, and let it stand in a 50°C constant temperature water bath for 70 minutes, separate the formed polymer from the liquid, and vacuum dry the polymer to obtain the outer coating material;

[0029] 2) Dissolving 10g of coating material in 70g of absolute ethanol to prepare feed liquid;

[0030] 3) Coating 30 g of feed solution on 20 g of solid hydrochloric acid by spray drying method to prepare coated solid acid.

Embodiment 2

[0032] A film-coated solid acid suitable for deep acid fracturing in carbonate reservoirs, the preparation process of which is as follows:

[0033] 1) Add 45g of ethylene oxide, 25g of hydroxyethyl methacrylate, 15g of phthalimide, and 15g of pentaerythritol triallyl ether into an anhydrous and oxygen-free pressure bottle, and continue to add 150g of benzene, 10g of Diethyl zinc, seal, shake well, and let it stand in a 50°C constant temperature water bath for 70 minutes, separate the formed polymer from the liquid, and vacuum dry the polymer to obtain the outer coating material;

[0034] 2) Dissolving 10g of coating material in 70g of absolute ethanol to prepare feed liquid;

[0035] 3) Coating 30 g of feed solution on 20 g of solid hydrochloric acid by spray drying method to prepare coated solid acid.

Embodiment 3

[0037] A film-coated solid acid suitable for deep acid fracturing in carbonate reservoirs, the preparation process of which is as follows:

[0038] 1) Add 50g of ethylene oxide, 30g of glycidyl methacrylate, 10g of glutarimide, and 10g of trimethylolpropane diallyl ether into an anhydrous and oxygen-free pressure bottle, and continue to add 150g Benzene, 10g of diethylzinc, seal, shake well, and let stand in a constant temperature water bath at 50°C for 70 minutes, separate the formed polymer from the liquid, and vacuum dry the polymer to obtain the outer coating material;

[0039] 2) Dissolving 10g of coating material in 70g of absolute ethanol to prepare feed liquid;

[0040] 3) Coating 30 g of feed solution on 20 g of solid hydrochloric acid by spray drying method to prepare coated solid acid.

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PUM

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Abstract

The invention discloses a film-coated solid acid suitable for deep acid fracturing of a carbonate reservoir. The film-coated solid acid is composed of an internal solid acid and an external film-coated material, wherein the external film-coated material comprises the following components in percentage by mass: 35-55% of a water-soluble skeleton monomer, 25-35% of an acid-resistant monomer, 10-15%of a temperature-resistant monomer and 10-15% of a strength monomer. The film-coated solid acid provided by the invention has a self-controlled release function, is good in retarding and corrosion inhibition performance, and can effectively reduce the acid rock reaction speed, increase the action distance of an acid liquid and improve the flow conductivity of a far-end crack; meanwhile, the preparation process is simpler and the cost is lower; and in the application process of the film-coated solid acid provided by the invention, the dependence on materials with relatively serious pollution such as a cross-linking agent is reduced, the damage to the stratum is greatly reduced, and the pollution to the stratum is reduced.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a film-coated solid acid suitable for deep acid fracturing of carbonate rock reservoirs. Background technique [0002] With the rapid development of the global oil and gas industry, oil and gas exploration and development are rapidly extending from shallow to deep and ultra-deep, from medium and low temperature to high and ultra-high temperature, and high-temperature deep carbonate reservoirs have become the focus. High-temperature carbonate reservoirs have low matrix permeability and low natural productivity. Generally, acid fracturing is performed during well completion to improve the reservoir and increase productivity. For high-temperature carbonate reservoirs with reservoirs far away from the wellbore or with ultra-low porosity and ultra-low permeability, only the deep acid fracturing process can maximize the length of acid-etched fractures, expand the ...

Claims

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Application Information

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IPC IPC(8): E21B43/27C09K8/72
CPCC09K8/725E21B43/26
Inventor 罗志锋吴林赵立强张楠林杨磊姚志广贾宇成蒲麒兵
Owner SOUTHWEST PETROLEUM UNIV
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