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Waterproof locking resistance reducing agent for unconventional oil and gas reservoir fracturing, preparation method and application

A technology for oil and gas reservoirs and drag reducing agents, which is applied in the field of fracturing fluids and can solve the problems of fast polymer polymerization rate and insufficient molecular weight to meet the requirements.

Pending Publication Date: 2022-07-29
美服(四川)能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that there are many problems in the existing emulsion-type drag reducing agent, and the polymerization rate of the polymer is relatively fast, and the molecular weight cannot meet the requirements.

Method used

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  • Waterproof locking resistance reducing agent for unconventional oil and gas reservoir fracturing, preparation method and application

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preparation example Construction

[0040] The preparation method of the above resistance reducing agent includes:

[0041] 1) Mix the white oil and organic montmorillonite of the formula, and stir until the viscosity of the mixture is uniform and stable;

[0042] 2) Add the surfactant, clay stabilizer and oxygen scavenger in the formula amount until fully dissolved;

[0043] 3) Add the polymer emulsion in the formula amount, and mix evenly to obtain the drag reducing agent.

[0044] Further, the process of the step 1) is: placing the white oil of the formula amount in the reaction kettle, warming up to 50~55 ℃, adding the organic montmorillonite of the formula amount, and the stirring rate is 1000~1200r / min, to The viscosity of the mixture is uniform and stable;

[0045] The process of the step 2) is as follows: the temperature in the kettle is lowered to 40-45° C., the stirring rate is 400-450 r / min, and the formula amount of surfactant, clay stabilizer and oxygen scavenger is added to fully dissolve;

[00...

Embodiment 1

[0054] 1) get 50kg of methacrylic acid-2-ethylhexyl and be dissolved in ethylene glycol to obtain solution A;

[0055] 2) get 6kg cyclohexanone peroxide and 6kg N, N-dimethylaniline is dissolved in ethylene glycol to obtain solution B;

[0056] 3) adding solution B at a uniform speed while stirring solution A to ensure uniform mixing to obtain a polymer emulsion;

[0057] 4) get 5# white oil 50kg and place in the reactor;

[0058] 6) The temperature in the reactor was raised to 55°C, 1.5kg of organic montmorillonite was added, and the stirring speed was controlled to be 1000r / min after the addition, until the viscosity of the mixture was uniform and stable;

[0059] 7) temperature in the reactor is down to 40 ℃, stirring speed is down to 400r / min, add 3.5kg surfactant (1.75kg sodium dodecylbenzene sulfonate mixes with 1.75kg dodecylamine acetate), 2kg Clay stabilizer and 1kg of oxygen scavenger until fully dissolved;

[0060] 8) Increase the temperature in the reaction kett...

Embodiment 2

[0062] 1) get 50kg of methacrylic acid-2-ethylhexyl and be dissolved in ethylene glycol to obtain solution A;

[0063] 2) get 7.5kg of cyclohexanone peroxide and 7.5kg of N, N-dimethylaniline and be dissolved in ethylene glycol to obtain solution B;

[0064] 3) adding solution B at a uniform speed while stirring solution A to ensure uniform mixing to obtain a polymer emulsion;

[0065] 4) Get 40kg of 5# white oil and place it in the reactor;

[0066] 6) The temperature in the reactor was raised to 50°C, 0.5kg of organic montmorillonite was added, and the stirring speed was controlled to be 1100r / min after the addition, until the viscosity of the mixture was uniform and stable;

[0067] 7) temperature in the reactor is reduced to 40 ℃, stirring speed is reduced to 450r / min, 2.5kg surfactant (1.25kg sodium dodecylbenzene sulfonate is mixed with 1.25kg dodecylamine acetate), 1.5 kg are added. kg of clay stabilizer and 0.6kg of oxygen scavenger until fully dissolved;

[0068] 8...

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Abstract

The invention discloses an anti-water-locking resistance reducing agent for fracturing of unconventional oil and gas reservoirs. The anti-water-locking resistance reducing agent comprises the following components: a polymer emulsion, white oil, organic montmorillonite, a surfactant, a clay stabilizer and a deoxidant, the polymer emulsion is prepared from a methacrylic acid-2-ethylhexyl ester alcoholic solution and an initiator, and the initiator is a mixture of cyclohexanone peroxide and N, N-dimethylaniline. The invention further discloses a preparation method and application. According to the invention, methacrylic acid-2-ethylhexyl ester is used as a polymeric monomer, so that the obtained resistance reducing agent does not generate a flocculation phenomenon when being applied to the fracturing fluid; and the polymer is a microemulsion, so that the problems of low dissolution rate and inconvenient on-site liquid preparation of a powder resistance reducing agent are solved. The surface active agent is introduced into the synthesis of the resistance reducing agent, so that the resistance reducing agent has the dual effects of a polymer and the surface active agent, and the water locking resistance of the resistance reducing agent can be improved, so that the water locking effect in shale gas fracturing can be eliminated.

Description

technical field [0001] The invention relates to the technical field of fracturing fluids, in particular to a water-proof locking and drag-reducing agent for fracturing unconventional oil and gas reservoirs, a preparation method and an application. Background technique [0002] At present, unconventional oil and gas field resources with low pressure and low permeability have become the key areas of exploration and development. Shale gas is a natural gas resource that can be exploited in shale layers, and China's recoverable shale gas reserves are relatively large. The Sinian, Cambrian, Shiyan, and Permian strata in southwestern China have very good shale gas resources and need to be developed urgently. [0003] During the development of shale gas resources, it is necessary to use drag-reducing agents, such as powder drag-reducing agents, mostly polyacrylamide polymers, which have the problems of low dissolution rate and inconvenient on-site liquid preparation. At the same t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/60C09K8/66C09K8/68C09K8/88C08F120/18
CPCC09K8/602C09K8/68C09K8/882C09K8/665C08F120/18C09K2208/12
Inventor 许云春时际明王志兴安耀清李清泉于思想牛庆华蔡为立
Owner 美服(四川)能源技术有限公司
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