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Variable-viscosity agent for alcohol-based acid liquor and preparation method of variable-viscosity agent

An alcohol-based acid and adhesive technology, which is applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve problems such as difficulty in using water-soluble diverting acid, and achieve the effects of avoiding formation damage, low production cost, and easy acquisition.

Active Publication Date: 2018-11-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem in the prior art that it is difficult to use water-soluble steering acid in water-sensitive formations, the embodiment of the present invention provides a viscosity-increasing agent for alcohol-based acid liquid and its preparation method. The technical scheme is as follows:

Method used

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  • Variable-viscosity agent for alcohol-based acid liquor and preparation method of variable-viscosity agent
  • Variable-viscosity agent for alcohol-based acid liquor and preparation method of variable-viscosity agent

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preparation example Construction

[0032] In the first aspect, an embodiment of the present invention provides a method for preparing a viscosity-increasing agent for alcohol-based acid liquid, the method for preparing the viscosity-increasing agent comprising:

[0033] Step 1, using unsaturated carboxylic acid and / or its salt monomer, unsaturated sulfonic acid and / or its salt monomer and acrylate monomer as raw materials to carry out polymerization reaction to obtain soap-free latex;

[0034] Step 2, mixing the soap-free latex and saturated alcohol evenly to obtain a viscous agent;

[0035] The mass ratio of acrylate monomer, unsaturated carboxylic acid and / or its salt monomer, and unsaturated sulfonic acid and / or its salt monomer is (80-95):(5-20):(0 -5);

[0036] The volume ratio of soap-free latex to saturated alcohol is 1:1-1:4.

[0037] The viscosity of the acid solution system of the viscosifying agent provided by the embodiments of the present invention can increase with the increase of the pH value o...

Embodiment 1

[0063] The present embodiment provides a kind of soap-free latex, and this soap-free latex is prepared by following method:

[0064] Step 1. Dissolve 0.27g of potassium persulfate, 7.5g of sodium acrylate, and 2.5g of 2-acrylamido-2-methylpropanesulfonate monomer into 10g of water, and mix uniformly to obtain the first mixture;

[0065] Under the condition of 65°C, uniformly mix 25g of methyl methacrylate monomer and 15g of ethyl methacrylate monomer, and add dropwise to 50g of water with the first mixture, and control the dropping end point to reach at the same time, to obtain the second mixture;

[0066] Step 2. The temperature of the second mixture is raised to 82° C. and kept for 0.4 h to obtain a soap-free latex; and the average particle diameter of the soap-free latex is 120 nm.

Embodiment 2

[0068] The present embodiment provides a kind of soap-free latex, and this soap-free latex is prepared by following method:

[0069] Step 1. Dissolve 0.33g of potassium persulfate, 7.5g of sodium acrylate monomer, and 2.5g of 2-acrylamido-2-methylpropanesulfonate monomer into 10g of water, and mix uniformly to obtain the first mixture;

[0070] Under the condition of 65°C, uniformly mix 25g of methyl methacrylate monomer and 15g of ethyl methacrylate monomer, and add dropwise to 50g of water with the first mixture, and control the dropping end point to reach at the same time, to obtain the second mixture;

[0071] Step 2. The temperature of the second mixture is raised to 85° C. and kept warm for 0.4 h to obtain a soap-free latex; and the average particle size of the soap-free latex is 90 nm.

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Abstract

The invention relates to the technical field of acidizing and fracturing operating fluid for petroleum and natural gas exploitation and discloses a variable-viscosity agent for alcohol-based acid liquor and a preparation method of the variable-viscosity agent and the alcohol-based acid liquor. The method includes: subjecting unsaturated carboxylic acid and / or salt monomers thereof, unsaturated sulfonic acid and / or salt monomers thereof and acrylic monomers to polymerization reaction to obtain soapless latex; well mixing the soapless latex with saturated alcohol to obtain the variable-viscosityagent, wherein a mass ratio of the acrylic monomers to the unsaturated carboxylic acid and / or salt monomers thereof to the unsaturated sulfonic acid and / or salt monomers thereof is (80-95):(5-20):(0-5), and a volume ratio of the soapless latex to the saturated alcohol is 1:1-1:4. The variable-viscosity agent has a great acid diverting function and can be applied to the field of acidizing and fracturing to effectively avoid reservoir damages caused by water-sensitive factors, and a uniform acidizing effect of inhomogenous reservoirs can be achieved. In addition, the variable-viscosity agent islow in cost, and raw materials are easy to acquire.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation acidizing fracturing fluid, in particular to a viscosity-increasing agent for alcohol-based acid fluid and a preparation method thereof. Background technique [0002] Acidizing or acid fracturing is one of the important stimulation measures for carbonate reservoirs. Improve the permeability of formation pores and fractures through the dissolution and dissolution of acid liquid on rock cement, formation pores, and blockages in fractures. During acidification, due to the low seepage resistance of the high-permeability layer of the reservoir, a large amount of acid liquid enters the high-permeability layer, and a small amount enters the medium-permeability reservoir, but it is difficult for the acid liquid to enter the low-permeability reservoir. Therefore, it is necessary to ensure the uniform effect of acid on the reservoir when performing efficient transformation on heterogeneous...

Claims

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Application Information

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IPC IPC(8): C09K8/74
CPCC09K8/74
Inventor 焦利宾郭建华郑友志李杰马辉运桑宇谢南星王福云杨涛李力曾立新王斌余江谭其艳
Owner PETROCHINA CO LTD
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