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Synthetic method of slippery water fracturing degradable diverting agent

A synthesis method and diverting agent technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of unsatisfactory plugging strength of temporary plugging agent, poor flowback performance, high cost of raw materials, etc., and achieve pressure-bearing Strong deformation ability, good flowback performance and good thermal stability

Active Publication Date: 2017-05-31
河南瑞通能源工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A lot of work has been done in the research and development of temporary plugging agents in China, and there are relatively mature temporary plugging agent products on the market. At present, the relatively mature water-based selective temporary plugging agents are mainly divided into gels and polymers, but There are common problems such as high cost and toxicity of raw materials, unsatisfactory plugging strength of temporary plugging agent products, and poor flowback performance.

Method used

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  • Synthetic method of slippery water fracturing degradable diverting agent
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  • Synthetic method of slippery water fracturing degradable diverting agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1, a kind of synthetic method of slippery water fracturing degradable diverting agent, comprises the following steps:

[0017] 1) With lactic acid (LA) as a monomer, stannous octoate (Sn(Oct) 2) As an initiator, control the temperature at 175 ° C, and synthesize polylactic acid (PLA) with carboxyl groups at the end under the protection of nitrogen, in which stannous octoate (Sn(Oct) 2) The amount of addition is 0.5% of the total amount of monomers, the reaction time is 8h, and the molecular weight of polylactic acid (PLA) with carboxyl groups at the end is 40,000 to 60,000.

[0018] 2) With tert-butyl acrylate (TBA) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) as functional monomers, carboxyl azo compound (4,4'-azobis(4-nitrile Valeric acid)) was used as an initiator to synthesize terminal carboxyl-containing oligomers (AMPS-TBA) under the protection of nitrogen, wherein tert-butyl acrylate (TBA) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) ...

Embodiment 2

[0021] Embodiment 2, a kind of synthetic method of slick water fracturing degradable diverting agent, comprises the following steps:

[0022] 1) With lactic acid (LA) as a monomer, stannous octoate (Sn(Oct) 2) As an initiator, control the temperature at 180 ° C, and synthesize polylactic acid (PLA) with carboxyl groups at the end under the protection of nitrogen, in which stannous octoate (Sn(Oct) 2) The amount of addition is 0.5% of the total amount of monomers, the reaction time is 10h, and the molecular weight of polylactic acid (PLA) with a carboxyl group at the end is 40,000 to 60,000.

[0023] 2) With tert-butyl acrylate (TBA) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) as functional monomers, carboxyl azo compound (4,4'-azobis(4-nitrile Valeric acid)) was used as an initiator to synthesize terminal carboxyl-containing oligomers (AMPS-TBA) under the protection of nitrogen, wherein tert-butyl acrylate (TBA) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) T...

Embodiment 3

[0026] Embodiment 3, a kind of synthetic method of slick water fracturing degradable diverting agent, comprises the following steps:

[0027] 1) With lactic acid (LA) as a monomer, stannous octoate (Sn(Oct) 2) As an initiator, control the temperature at 185°C, synthesize polylactic acid (PLA) with a carboxyl group at the end under nitrogen protection, wherein the addition of stannous octoate (Sn(Oct) 2 ) is 0.5% of the total amount of monomers, and the reaction time is 12h, the molecular weight of polylactic acid (PLA) with carboxyl group at the end is 40,000 to 60,000,

[0028] 2) With tert-butyl acrylate (TBA) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) as functional monomers, carboxyl azo compound (4,4'-azobis(4-nitrile Valeric acid)) was used as an initiator to synthesize terminal carboxyl-containing oligomers (AMPS-TBA) under the protection of nitrogen, wherein tert-butyl acrylate (TBA) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) The mass ratio is 1:2,...

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Abstract

The invention relates to a synthetic method of a slippery water fracturing degradable diverting agent. Lactic acid (LA) is a monomer, stannous octoate (Sn (Oct) )(2) is used as an initiator, and polylactic acid (PLA) with carboxyl at the tail end is synthesized under the protection of nitrogen; tert-butyl acrylate (TBA) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) are used as functional monomers, carboxylic azo compound (4,4'-azobis(4-cyano valeric acid)) is used as an initiator, and oligomer (AMPS-TBA) with carboxyl group at the tail end is synthesized under the protection of nitrogen; the polylactic acid (PLA) with carboxyl at the tail end, the oligomer (AMPS-TBA) with carboxyl group at the tail end and a starch solution are mixed, graft copolymerization is performed by using concentrated sulfuric acid as a catalyst; the grafted copolymer product is granulated and dried to obtain solid particles which are the slippery water fracturing degradable diverting agent. The prepared slippery water fracturing degradable temporary plugging diverting agent has the advantages of being easy to degrade, good in flowback performance, high in temporary plugging strength and environment-friendly in raw materials.

Description

technical field [0001] The invention relates to the technical field of oil and gas field fracturing transformation, in particular to a method for synthesizing a degradable diverting agent for slick water fracturing. Background technique [0002] Temporary plugging diversion fracturing is one of the most effective stimulation measures to increase the production and recovery of high water-cut oil wells in the short term after the initial fracturing. By adding temporary plugging agent in real time during the fracturing process, temporary plugging of old fractures or sand added The change of fracture pressure and fracture extension pressure changes the fluid to create new fractures. A lot of work has been done in the research and development of temporary plugging agents in China, and there are relatively mature temporary plugging agent products on the market. At present, the relatively mature water-based selective temporary plugging agents are mainly divided into gels and polyme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08G63/06C08F220/58C08F220/18C09K8/508
CPCC09K8/5086C08F220/58C08G63/06C08G81/027C08F220/585C08F220/1804
Inventor 柯从玉孙妩娟张群正张洵立
Owner 河南瑞通能源工程技术有限公司
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