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Preparation method of multi-component organic cross-linked acid liquid

A cross-linked acid, multi-component technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of limiting the popularization and application of emulsified acid, poor temperature and shear resistance, and difficult liquid flowback, etc. To meet the requirements of on-site construction, low liquid filtration, and complete gel breaking

Active Publication Date: 2013-07-31
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ordinary thickened acid (gelled acid) reduces the reaction rate of acid rock by adjusting the viscosity of acid liquid, but this type of system has poor temperature resistance and shear resistance, and the liquid is not easy to flow back after gel breaking; foam acid has low filtration loss, It has the advantages of small frictional resistance and small amount of acid liquid, but it is only suitable for acid fracturing construction in well depths of 1500-2500m, not suitable for high-temperature deep well acid fracturing, and has special requirements for on-site construction equipment; emulsified acid often uses diesel oil or crude oil as emulsification The external phase of the acid, the internal phase is generally hydrochloric acid or earth acid, which has the disadvantage of high friction (20% higher than that of ordinary thickened acid), and the use of diesel oil causes safety hazards in on-site construction, and also limits the use of emulsified acid. Promote application

Method used

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  • Preparation method of multi-component organic cross-linked acid liquid
  • Preparation method of multi-component organic cross-linked acid liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 3.6% formic acid, 4.8% acetic acid, 13.75% hydrochloric acid, and 71.25% water were made into an acid solution, and 4.0% high-temperature corrosion inhibitor was added. The high-temperature corrosion inhibitor was Mannich base and 2-alkyl-1-(N -Compound of polyoxyethylene-2-aminoethyl) imidazoline-1-benzyl ammonium fatty acid salt, dynamic corrosion rate at 160°C≤70g / (m 2 h), belongs to the first grade stipulated in the industry standard "SY / T 5405-1996 Corrosion Inhibitor Performance Test Method and Evaluation Index for Acidification"; iron ion stabilizer 1.0%, iron ion stabilizer is EDTA calcium sodium; long-acting clay Stabilizer 0.5%, long-acting clay stabilizer is epichlorohydrin and polyethylene polyamine copolymer; demulsification aid 0.5%, demulsification aid is polyoxyethylene alkyl alcohol ether nonionic surfactant; Under 2000r / min high-speed stirring, add thickener 0.6% to make base liquid, thickener is 2-acrylamide-2-methylpropane sulfonate, methacrylamide (...

Embodiment 2

[0022] 3.6% formic acid, 4.8% acetic acid, 13.75% hydrochloric acid, and 68.65% water were made into an acid solution, and 5.0% high-temperature corrosion inhibitor was added. The high-temperature corrosion inhibitor was Mannich base and 2-alkyl-1-(N -Compound of polyoxyethylene-2-aminoethyl) imidazoline-1-benzyl ammonium fatty acid salt, dynamic corrosion rate at 160°C≤70g / (m 2 h), belongs to the first grade stipulated in the industry standard "SY / T 5405-1996 Corrosion Inhibitor Performance Test Method and Evaluation Index for Acidification"; iron ion stabilizer 1.5%, iron ion stabilizer is EDTA calcium sodium; long-acting clay Stabilizer 1.0%, long-acting clay stabilizer is epichlorohydrin and polyethylene polyamine copolymer; demulsification aid and drainage agent 1.0%, demulsification aid and drainage agent is polyoxyethylene alkyl alcohol ether nonionic surfactant; Under 2000r / min high-speed stirring, add thickener 0.7% to make base liquid, thickener is 2-acrylamide-2-met...

Embodiment 3

[0025] 3.6% formic acid, 4.8% acetic acid, 13.75% hydrochloric acid, and 68.55% water were made into an acid solution, and 5.0% high-temperature corrosion inhibitor was added. The high-temperature corrosion inhibitor was Mannich base and 2-alkyl-1-(N -Compound of polyoxyethylene-2-aminoethyl) imidazoline-1-benzyl ammonium fatty acid salt, dynamic corrosion rate at 160°C≤70g / (m 2 h), belongs to the first grade stipulated in the industry standard "SY / T 5405-1996 Corrosion Inhibitor Performance Test Method and Evaluation Index for Acidification"; iron ion stabilizer 1.5%, iron ion stabilizer is EDTA calcium sodium; long-acting clay Stabilizer 1.0%, long-acting clay stabilizer is epichlorohydrin and polyethylene polyamine copolymer; demulsification aid and drainage agent 1.0%, demulsification aid and drainage agent is polyoxyethylene alkyl alcohol ether nonionic surfactant; Under 2000r / min high-speed stirring, add thickener 0.8% to make base liquid, thickener is 2-acrylamide-2-met...

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Abstract

The invention relates to a preparation method of multi-component organic cross-linked acid liquid, which comprises base liquid and a cross-linking agent, wherein the weight ratio of the base liquid and the cross-linking agent is 100:0.6-0.8; the base liquid comprises the following components in percentage by weight: 3.6-9 percent of formic acid, 4.8-12 percent of acetic acid, 5.5-13.75 percent ofhydrochloric acid, 0.6-0.8 percent of thickening agent, 4.0-5.0 percent of high-temperature corrosion inhibitors, 0.5-1.0 percent of long-term clay stabilizer, 1.0-1.5 percent of ferric ion stabilizers, 0.5-1.0 percent of broken emulsion discharge aiding agent and the balance is water; and the sum of the mass percentages of all the components is 100%. The method has the beneficial effects that the acid liquid system can be cross-linked under the conditions of high temperature and strong acid and is good in temperature resistance and shear resistance, less in filtration and complete in gelout;after the acid liquid is cross-linked, an acid rock is remarkably lower than ordinary gelled acid in reaction speed and is good in speed retarding performance; and the multi-component organic cross-linked acid liquid can be used for realizing the modification of depth acid pressure in a high-temperature deep well of a carbonate rock.

Description

technical field [0001] The invention relates to a method for preparing a multi-component organic crosslinking acid solution. Background technique [0002] The acid fracturing of high-temperature carbonate reservoirs has problems such as too fast reaction of acid rock, unable to form long acid-etched fractures, and unable to realize deep acid fracturing. Experts and scholars at home and abroad have done a lot of research work to solve the deep acid fracturing of high-temperature deep wells in carbonate rocks, and proposed acid systems such as thickened acid (gelling acid), foam acid, and emulsified acid. Ordinary thickened acid (gelled acid) reduces the reaction rate of acid rock by adjusting the viscosity of acid liquid, but this type of system has poor temperature resistance and shear resistance, and the liquid is not easy to flow back after gel breaking; foam acid has low filtration loss, It has the advantages of small frictional resistance and small amount of acid liquid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74
Inventor 宋有胜徐建华郝志伟王宇宾刘京徐鸿志罗成王雪莹
Owner BC P INC CHINA NAT PETROLEUM CORP
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