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Acid-resistant resistance reducing agent, preparation method thereof and acid-resistant slickwater fracturing fluid system

A drag reducing agent and system technology, applied in the field of recyclable fracturing fluid in oil and gas fields, can solve the problems of not having acid resistance, incomplete degradation, reservoir damage, etc., and achieve good reservoir adaptability and core permeability damage Effect of low and fast dissolution properties

Active Publication Date: 2020-10-09
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, modified polyacrylamide polymers are generally used as drag reducers in slick water fracturing fluid systems, but this type of system does not have the characteristics of acid resistance, and it cannot be completely degraded at the reservoir temperature after construction, which has a certain impact on the reservoir. degree of injury and other adverse effects

Method used

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  • Acid-resistant resistance reducing agent, preparation method thereof and acid-resistant slickwater fracturing fluid system
  • Acid-resistant resistance reducing agent, preparation method thereof and acid-resistant slickwater fracturing fluid system
  • Acid-resistant resistance reducing agent, preparation method thereof and acid-resistant slickwater fracturing fluid system

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preparation example Construction

[0030] The preparation method of the above-mentioned acid-resistant drag-reducing agent comprises the following steps:

[0031] Step 1. In parts by mass, 80-100 parts of hydrophobic monomers, 5-10 parts of salt-tolerant monomers, 5-10 parts of shear-resistant monomers, 60-100 parts of water-soluble monomers, 90-100 parts of Parts of ammonium sulfate and a certain amount of water, stirred until dissolved to obtain the mixed system a.

[0032] Step 2: Add 20 parts of sodium hydroxide solution and a certain amount of water to 100 parts of the mixed system a in parts by mass to obtain a monomer mixed solution.

[0033] Step 3, remove the oxygen in the monomer solution, and add 0.05 parts of oxidizing initiator and 1 part of 2,3,5,6-tetrahydroxy-2- The aqueous solution of hexenoic acid-4-lactone is subjected to a polymerization reaction, and when the temperature is higher than 40° C., it is reacted in a water bath for 8 hours to obtain a white and transparent acid-resistant drag-r...

Embodiment 1

[0040] A preparation method of an acid-resistant drag reducing agent, comprising the following steps:

[0041] Step 1. In parts by mass, 80 parts of acryloylpropyl dimethyl dodecyl ammonium bromide, 5 parts of acryloyl propyl dimethyl sulfobetaine, 5-10 parts of N-ethylene Base pyrrolidone, 60 parts of allyl polyoxyethylene ether, 90-100 parts of ammonium sulfate and a certain amount of water, and stir until dissolved to obtain the mixed system a.

[0042] Step 2: Add 20 parts of sodium hydroxide solution and a certain amount of water to 100 parts of the mixed system a in parts by mass to obtain a monomer mixed solution.

[0043] Step 3, remove the oxygen in the monomer solution, and add 0.05 parts of 1% wt potassium persulfate aqueous solution and 1 part of 2,3,5,6-tetrahydroxy - 2-hexenoic acid-4-lactone aqueous solution is polymerized, and when the temperature is higher than 40°C, it is reacted in a water bath for 8 hours to obtain a white and transparent acid-resistant dr...

Embodiment 2

[0045] A preparation method of an acid-resistant drag reducing agent, comprising the following steps:

[0046] Step 1, in parts by mass, 90 parts of acryloyl propyl dimethyltetradecyl ammonium bromide, 7 parts of 2-acrylamido-2-methylpropanesulfonic acid, 8 parts of chitosan, 80 parts of dimethylaminoethyl acrylate, 90-100 parts of ammonium sulfate and a certain amount of water are stirred until dissolved to obtain the mixed system a.

[0047] Step 2: Add 20 parts of sodium hydroxide solution and a certain amount of water to 100 parts of the mixed system a in parts by mass to obtain a monomer mixed solution.

[0048] Step 3, remove the oxygen in the monomer solution, and add 0.05 parts of 1% wt potassium persulfate aqueous solution and 1 part of 2,3,5,6-tetrahydroxy - 2-hexenoic acid-4-lactone aqueous solution is polymerized, and when the temperature is higher than 40°C, it is reacted in a water bath for 8 hours to obtain a white and transparent acid-resistant drag-reducing a...

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Abstract

According to the acid-resistant resistance reducing agent, the preparation method of the acid-resistant resistance reducing agent and the acid-resistant slickwater water fracturing fluid system. A hydrophobic monomer is introduced into the molecular structure, so that the system has good rheological and gel breaking performance in an aqueous solution, the technological requirements of long-crack and high-sand-ratio construction can be met, and the fracturing fluid has good temperature resistance under the acid condition; moreover, the thickening agent has a rapid dissolving property in an acidsolution, and can meet the technological requirements of industrial operation construction. The acid-resistant slickwater fracturing fluid system prepared from the acid-resistant resistance reducingagent is completely degraded at the reservoir temperature, damage to a reservoir is reduced, the fracturing fluid system has low surface and interface tension and residue content, rock core permeability damage is low, and good reservoir adaptability is shown.

Description

technical field [0001] The invention relates to the technical field of recyclable fracturing fluid for oil and gas fields, in particular to an acid-resistant drag reducing agent, a preparation method thereof, and an acid-resistant slick water fracturing fluid system. Background technique [0002] In recent years, tight carbonate gas reservoirs in the Lower Paleozoic in Changqing have become a key area for increasing reserves and production, as well as the focus of natural gas exploration and development. However, judging from the current exploration situation, this block has unfavorable characteristics such as deep gas reservoir burial, poor physical properties, and strong heterogeneity. In the early stage, based on the concept of volume fracturing, the "multi-component, high-displacement, multi-stage injection" multi-system composite deep acid fracturing technology was developed by optimizing the injection form. The field test has achieved a certain effect of increasing pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/60C08F226/10C08F220/28C08F220/26C08F283/06C08F220/58C08F251/00C08F220/56C09K8/68C09K8/88
CPCC08F220/60C08F283/065C08F251/00C08F226/02C09K8/68C09K8/882C09K2208/10C09K2208/28C09K2208/12C08F220/606C08F226/10C08F220/286C08F220/26C08F212/30C08F226/06C08F220/34
Inventor 石华强李宪文丁里张燕明刘晓瑞李小玲刘静孟磊王历历祖凯傅鹏
Owner PETROCHINA CO LTD
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