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Environment-friendly high-temperature self-gel-breaking resistance reducing agent as well as preparation method and application thereof

A drag-reducing agent and an environment-friendly technology, which is applied in the field of environment-friendly high-temperature self-breaking drag-reducing agent and its preparation, can solve the problems of inaccurate addition, fluctuation of gel-breaking effect, unautomated addition of gel-breaker, etc., and achieve saving cost, reduce preparation cost, and reduce the effect of process cost

Pending Publication Date: 2021-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that in the existing slick water fracturing fluid system, the addition of the gel breaker is not automated, cannot be added accurately, and easily causes fluctuations in the gel breaking effect, and provides an environmentally friendly high-temperature self-breaking gel resistance reduction The drag reducing agent and its preparation method and application, the drag reducing agent can realize automatic and uniform gel breaking under the condition of high temperature formation above 120°C under the premise of maintaining the drag reducing performance of the drag reducing agent, so as to meet the needs of fracturing technology

Method used

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  • Environment-friendly high-temperature self-gel-breaking resistance reducing agent as well as preparation method and application thereof
  • Environment-friendly high-temperature self-gel-breaking resistance reducing agent as well as preparation method and application thereof

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preparation example Construction

[0030] The second aspect of the present invention provides a method for preparing an environment-friendly high-temperature self-breaking drag-reducing agent, wherein the method includes:

[0031] (1) uniformly mixing the polymerized monomer, stabilizer, oxidizing agent, precipitation agent and water to obtain a clear solution;

[0032] (2) In an inert atmosphere, the reducing agent is mixed with the clear solution to perform a polymerization reaction to obtain the environment-friendly high-temperature self-breaking drag reducing agent.

[0033] In the present invention, a two-phase aqueous reaction polymerization system is used to prepare the drag reducing agent, and its continuous phase is an aqueous phase. During the preparation process, by adjusting the feeding sequence of the oxidizing agent and the reducing agent, the gel breaker is added in advance during the preparation of the drag reducing agent, and together with the copolymer in the drag reducing agent, a uniform liq...

Embodiment 1

[0063] At room temperature, in a 500ml three-neck flask, add 500,000 molecular weight poly-2-acrylamido-2-dimethylpropanesulfonate sodium 5g, deionized water 235g, acrylamide 50g, acrylic acid 24g, potassium chlorate 1g, dissolve evenly , add 80g of ammonium sulfate, fully dissolved to form a clear solution. Nitrogen was bubbled under stirring for 20 minutes. Under nitrogen protection, under the condition of 30°C, 5g of 16wt% sodium bisulfite solution was uniformly added within 6 hours, and the molar ratio of the oxidizing agent gaining electrons to the reducing agent losing electrons was 3.2:1. The system gradually turns white within 10 hours, forming a white emulsion drag reducer A1. After testing, in the drag reducer A1, the oxidant content is 0.22wt%, and the solid content is 18.5wt%. In the acrylamide copolymer, acrylamide The content of the structural unit is 68wt%, and the content of the structural monomer B is 32wt%.

Embodiment 2

[0065] At room temperature, in a 500ml three-necked flask, add 500,000 molecular weight poly 2-acrylamido-2-dimethylpropanesulfonate sodium 5g, deionized water 232.1g, acrylamide 55g, methacrylic acid 22g, potassium chlorate 0.9g , After dissolving evenly, add 80g of ammonium sulfate, fully dissolve to form a clear solution. Nitrogen was bubbled under stirring for 20 minutes. Under nitrogen protection, at 30°C, 5 g of 16% sodium bisulfite solution was evenly added within 6 hours, and the molar ratio of the oxidizing agent gaining electrons to the reducing agent losing electrons was 2.9:1. The system gradually turns white within 10 hours, forming a white emulsion drag reducer A2. After testing, the content of oxidant in drag reducer A2 is 0.19wt%, and the solid content is 19.25wt%. Among acrylamide copolymers, acrylamide The content of the structural unit is 71 wt%, and the content of the structural monomer B is 29 wt%.

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Abstract

The invention relates to the field of petroleum engineering, and discloses an environment-friendly high-temperature self-gel-breaking resistance reducing agent which comprises an acrylamide copolymer and an oxidizing agent. The oxidizing agent is selected from chlorate. The copolymer comprises a structural unit A provided by acrylamide. Based on the total weight of the resistance reducing agent, the content of the oxidizing agent is 0.1-1 wt%, preferably 0.15-0.35 wt%. The environment-friendly high-temperature self-gel-breaking resistance reducing agent provided by the invention has the function of automatically and uniformly breaking gel at the formation temperature of 120 DEG C or above while having the resistance reducing performance of a conventional resistance reducing agent. The oil-phase-free and surfactant-free environment-friendly performance is achieved, and the raw material cost and the preparation cost are reduced.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to an environment-friendly high-temperature self-breaking rubber resistance reducing agent and its preparation method and application. Background technique [0002] Since the middle of last century, hydraulic fracturing technology has been the main stimulation technology in oil and gas development at home and abroad. After entering the new century, hydraulic fracturing technology, as a key technology for the development of unconventional resources such as tight sandstone oil and gas, coalbed methane and shale oil and gas, has been highly valued. [0003] The water-based fracturing technology used in the development of unconventional resources is mainly slickwater fracturing fluid system. Slippery water fracturing fluid is mainly composed of drag reducer and other fracturing additives. The slick water fracturing fluid has a high displacement to open the formation and form long...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C09K8/68
CPCC08F220/56C09K8/665C09K8/68C09K8/882C09K8/90C09K2208/26C09K2208/28C08F220/06
Inventor 祝纶宇伊卓刘希方昭胡晓娜李雅婧杨金彪
Owner CHINA PETROLEUM & CHEM CORP
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