Dually retarded emulsified self-generated acid and preparation method thereof

A self-generating acid and retarding technology, applied in chemical instruments and methods, earth drilling, mining fluids, etc., can solve the problems of poor temperature resistance, lack of retarding effect, unusable, etc., and achieve high conductivity, good Acidification effect, good retarding performance effect

Active Publication Date: 2020-01-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN102899012A discloses a kind of authigenic acid, its preparation method and application. The authigenic acid includes paraformaldehyde, ammonium chloride and water. The system will slowly generate hydrochloric acid when mixed at room temperature, and it will generate acid rapidly under heating conditions, and there will be filtration loss. Serious, poor temperature resistance, poor etching form, can not be used in high temperature deep wells, does not have double retarding effect
When the above-mentioned authigenic acid meets the formation water, the acid solution will be diluted quickly, and a good acidizing effect cannot be achieved.

Method used

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  • Dually retarded emulsified self-generated acid and preparation method thereof
  • Dually retarded emulsified self-generated acid and preparation method thereof
  • Dually retarded emulsified self-generated acid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Prepare autogenous acid A by the following components by weight: 100 parts by weight of paraformaldehyde (commercially available), add 50 parts of water, 0.15 part of sodium hydroxide (commercially available), and then add 0.5 part of iron ion stabilizer (commercially available) and 1 part of corrosion inhibitor ethylenediaminetetraacetic acid (commercially available), stir evenly;

[0048] (2) Prepare autogenic acid matrix B according to the following components by weight: by mass fraction, weigh 100 parts of ammonium chloride (commercially available), measure 50 parts of water, and add ammonium chloride to the water. Stir until dissolved. Add 1 part of iron ion stabilizer (commercially available) and 1 part of corrosion inhibitor ethylenediaminetetraacetic acid (commercially available) to B, and stir well

[0049] (3) Prepare the oil external phase according to the following components by weight: heat and dissolve 3 parts of span80 and 0.5 part of dodecylamine in...

Embodiment 3

[0057] (1) Prepare autogenic acid matrix A according to the following components by weight: 100 parts by weight of paraformaldehyde (commercially available), add 50 parts of water, 0.15 parts of sodium hydroxide (commercially available), and then add 0.5 parts of iron ions to stabilize agent (commercially available) and 1 part of corrosion inhibitor ethylenediaminetetraacetic acid (commercially available), stir evenly;

[0058] (2) Prepare autogenic acid matrix B according to the following components by weight: by mass fraction, weigh 100 parts by weight of ammonium chloride (commercially available), measure 50 parts of water, and add salt into the water. Stir until dissolved. Add 0.5 part of iron ion stabilizer (commercially available) and 1 part of corrosion inhibitor ethylenediaminetetraacetic acid (commercially available) in B, stir well

[0059] (3) Prepare the oil external phase according to the following components by weight: heat and dissolve 3 parts of sorbitan sorbi...

Embodiment 4

[0062] (1) Prepare autogenic acid matrix A according to the following components by weight: 100 parts by weight of paraformaldehyde (commercially available), add 50 parts of water, 0.15 parts of sodium hydroxide (commercially available), and then add 0.5 parts of iron ions to stabilize agent (commercially available) and 1 part of corrosion inhibitor ethylenediaminetetraacetic acid (commercially available), stir evenly;

[0063] (2) Prepare autogenic acid matrix B according to the following components by weight: by mass fraction, weigh 100 parts by weight of ammonium chloride (commercially available), measure 40 parts of water, add the salt into the water, and stir until dissolved. Add 1 part of iron ion stabilizer (commercially available) and 1 part of corrosion inhibitor ethylenediaminetetraacetic acid to B, and stir well

[0064] (3) Prepare the oil external phase according to the following components by weight: heat and dissolve 2 parts of autosorbitan fatty acid ester and ...

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Abstract

The invention discloses a dually retarded emulsified self-generated acid and a preparation method thereof. The emulsified self-generated acid comprises the following components in parts by volume: 60-80 parts of self-generated acid and 20-40 parts of an oil phase, wherein the oil phase contains 3-5 parts by weight of an emulsifier based on 100 parts by weight of the total amount of the oil phase.The preparation method comprises the following steps: dropwise adding the oil phase into the self-generated acid according to the usage amount under high-speed stirring of 1000r/min-3000r/min, and carrying out stirring for 10-30min to form a uniform emulsion to prepare the dually retarded emulsified self-generated acid. An emulsion of the emulsified self-generated acid provided by the invention combines advantages of self-generated acids and emulsified acids, has good stability at 200 DEG C, can meet the requirements of acid pressing/acidifying construction of an ultra-high temperature carbonate reservoir, and has a good popularization and application prospect.

Description

technical field [0001] The invention relates to the field of acid fracturing stimulation of carbonate rock reservoirs, and furthermore, relates to a double retarded emulsified authigenic acid and a preparation method thereof. Background technique [0002] With the deepening of exploration and development of carbonate reservoirs, in order to meet the requirements of deep acidification, the performance requirements of acid system are getting higher and higher, and it is urgent to develop a new type of high temperature resistant slow acid system. [0003] Autogenous acid, also known as latent acid, refers to the formation of active acid by chemical reaction of the acid matrix under formation conditions. Different autogenous acid systems can produce HCl and HF or a mixture of both. The use of authigenic acid systems in high-temperature formations can not only avoid the rapid deactivation of acid liquids at high temperatures and shorten the effective length of acid-etched fractur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/72E21B43/27
CPCC09K8/72E21B43/283
Inventor 贾文峰王旭蒋廷学姚奕明魏娟明吴峙颖
Owner CHINA PETROLEUM & CHEM CORP
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