A kind of surfactant acid resistant thickener and using method thereof

A surfactant and thickener technology, applied in chemical instruments and methods, earth drilling, mining fluids, etc., can solve the problems of difficult gel breaking, low temperature resistance, large residue, etc., to reduce construction pressure, thicken The effect of fast melting speed and low friction

Active Publication Date: 2018-05-25
SHAANXI YOUBANG PETROLEUM ENG TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two systems are both polymer systems with strong acid resistance and can carry a hydrochloric acid concentration greater than 20%. The requirements for the fluid are more stringent, and the well fluid with lower damage is required. However, the conventional cross-linked acid and thickened acid have difficulties in gel breaking after entering the well, with large residues and relatively high friction. Currently, surfactants are used as acid fluids. Thickener is a compound of surfactant. After thickening, it breaks the gel without residue and does not cause secondary damage. However, surfactant thickeners generally have low temperature resistance (less than 100°C), instability and other technologies. Difficulties, especially to solve the technical problems of rapid dissolution and thickening of acid thickeners under high acid concentration, so it is necessary to develop high temperature resistant and instant surfactant acid-resistant thickeners

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A surfactant acid-resistant thickener is composed of 40% long-chain alkyl polyoxyethylene ethyl acrylate, 25% 2-aminophenol-4-sodium sulfonate, 15% ethanol and 20% clear water. The above-mentioned Percentages are mass percentages.

[0019] The preparation method of the thickener is: adding the long-chain alkyl polyoxyethylene ethyl acrylate and 2-aminophenol-4-sodium sulfonate in the formulation amount to the ethanol in the formulation amount, stirring evenly, and then adding the formulation amount water to mix evenly.

[0020] The surfactant acid-resistant thickener of the present invention can form a viscous acid solution within 1-2 minutes, the viscosity is greater than 30mPa.s, and the temperature resistance is greater than 100°C.

Embodiment 2

[0022] A method for using a surfactant acid-resistant thickener, characterized in that: the specific steps are as follows:

[0023] The first step: configure a stable viscous acid;

[0024] Step 2: Open the wellhead of the measure well, and pump the viscous acid liquid into the well through the fracturing vehicle;

[0025] Step 3: Shut down the well for 30-90 minutes after the operation, and wait for the viscous acid liquid to react completely in the reservoir;

[0026] Step 4: Open the wellhead and control blowout;

[0027] Step 5: The construction is over.

[0028] The first step: configure a stable viscous acid solution; mix the thickener with hydrochloric acid with a concentration of 10% to 25% by mass and stir evenly to form a viscous acid solution; wherein, the thickener and hydrochloric acid The mass percentage is: the thickener is 3%-8%, and the balance is hydrochloric acid.

[0029] Wherein, the thickener is composed of 40% long-chain alkyl polyoxyethylene ethyl a...

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Abstract

The invention discloses a surfactant acid-resistant thickener and a use method thereof, and relates to the technical field of acidification of a surfactant acid-resistant thickener suitable for sandstone and carbonatite reservoirs. The thickener is made of 40% Alkyl polyoxyethylene ethyl acrylate, 25% 2-aminophenol-4-sodium sulfonate, 15% ethanol and 20% clear water, the above percentages are mass percentages. The thickener can form a viscous acid solution within 1-2 minutes, the viscosity is greater than 30mPa.s, and the temperature resistance is greater than 100°C. The thickener is mixed with hydrochloric acid with a mass percentage concentration of 10% to 25% and stirred evenly to form a viscous acid solution; wherein, the thickener and hydrochloric acid mass percentage are: the thickener is 3%-8%, The balance is hydrochloric acid. The viscous acid liquid is pumped downhole by a fracturing vehicle for acidification construction, and the gel can be broken automatically without adding a gel breaker during the construction process.

Description

technical field [0001] The invention relates to the technical field of acidification used in petroleum exploitation, in particular to a surfactant acid-resistant thickener suitable for sandstone and carbonatite reservoirs and a use method thereof. Background technique [0002] In the field of oil and gas field development in my country, acidified fluid acid fracturing technology, namely cross-linked acid system and thickened acid system, is often used for the reconstruction of some low-permeability sandstone reservoirs and carbonate reservoirs. These two systems are both polymer systems with strong acid resistance and can carry a hydrochloric acid concentration greater than 20%. The requirements for the fluid are more stringent, and the well fluid with lower damage is required. However, the conventional cross-linked acid and thickened acid have difficulties in gel breaking after entering the well, with large residues and relatively high friction. Currently, surfactants are u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/584E21B43/22
CPCC09K8/584C09K2208/26E21B43/16
Inventor 陈柯全李刚
Owner SHAANXI YOUBANG PETROLEUM ENG TECH CO LTD
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