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Temperature-sensitive polymer, foam fracturing fluid as well as preparation method and application thereof

A foam fracturing fluid and polymer technology, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of increased fluid loss, poor foam quality, and rheological effects of fracturing fluid, and achieve increased viscosity , good foam stabilization effect

Active Publication Date: 2020-09-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the application of foam fracturing fluid in refracturing technology mainly has the following two problems. First, conventional foam fracturing fluid has a high viscosity at room temperature. When it reaches the target layer, the viscosity decreases due to the increase of formation temperature. , leading to increased fluid loss; secondly, the foam quality in conventional foam fracturing fluids is poor, and the foam quality has a great influence on the rheological properties of fracturing fluids

Method used

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  • Temperature-sensitive polymer, foam fracturing fluid as well as preparation method and application thereof
  • Temperature-sensitive polymer, foam fracturing fluid as well as preparation method and application thereof
  • Temperature-sensitive polymer, foam fracturing fluid as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] This example is to prepare a foam fracturing fluid system, which is composed of: 0.4% of thermosensitive polymer, 0.3% of clay stabilizer, 0.2% of foaming agent, 0.4% of crosslinking agent, 98.7% of water, CO 2 gas.

[0075] The clay stabilizer is KCl and choline chloride, the mass ratio of the two is 1:1; the foaming agent is perfluorolauryl polyoxyethylene ether and betaine, the mass ratio of the two is 1:5; the crosslinking agent is titanium Butyl acid, lactic acid and ethylene glycol, the mass ratio of the three is 1:6:3.

[0076] Preparation of thermosensitive polymers:

[0077] Four monomers of acrylamide, acrylic acid, hexafluorobutyl methacrylate, and hexadecyldimethylallyl ammonium chloride were sequentially added in deionized water until dissolved; The monomer accounts for 30% of the reaction solution, 50 parts of acrylamide, 45 parts of acrylic acid, 3 parts of hexafluorobutyl methacrylate, and 2 parts of hexadecyldimethylallyl ammonium chloride; in the abo...

Embodiment 2

[0085] This example is to prepare a foam fracturing fluid system, which consists of: 0.5% thermosensitive polymer, 0.3% clay stabilizer, 0.2% foaming agent, 0.5% crosslinking agent, 98.5% water, CO 2 gas.

[0086] The clay stabilizer is KCl and choline chloride, the mass ratio of the two is 1:1; the foaming agent is perfluorolauryl polyoxyethylene ether and betaine, the mass ratio of the two is 1:5; the crosslinking agent is titanium Butyl acid, lactic acid and ethylene glycol, the mass ratio of the three is 1:6:3.

[0087] Preparation of thermosensitive polymers:

[0088] Four monomers of acrylamide, acrylic acid, hexafluorobutyl methacrylate, and hexadecyldimethylallyl ammonium chloride were sequentially added in deionized water until dissolved; The monomer accounts for 30% of the reaction solution, 50 parts of acrylamide, 45 parts of acrylic acid, 3 parts of hexafluorobutyl methacrylate, and 2 parts of hexadecyldimethylallyl ammonium chloride; in the above solution Add 3...

Embodiment 3

[0096] This example is to prepare a foam fracturing fluid system, which consists of: 0.6% thermosensitive polymer, 0.3% clay stabilizer, 0.2% foaming agent, 0.6% crosslinking agent, 98.3% water, CO 2 gas.

[0097] The clay stabilizer is KCl and choline chloride, the mass ratio of the two is 1:1; the foaming agent is perfluorolauryl polyoxyethylene ether and betaine, the mass ratio of the two is 1:5; the crosslinking agent is titanium Butyl acid, lactic acid and ethylene glycol, the mass ratio of the three is 1:6:3.

[0098] Preparation of thermosensitive polymers:

[0099] Four monomers of acrylamide, acrylic acid, hexafluorobutyl methacrylate, and hexadecyldimethylallyl ammonium chloride were sequentially added in deionized water until dissolved; The monomer accounts for 30% of the reaction solution, 50 parts of acrylamide, 45 parts of acrylic acid, 3 parts of hexafluorobutyl methacrylate, and 2 parts of hexadecyldimethylallyl ammonium chloride; in the above solution Add 3...

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Abstract

The invention relates to a temperature-sensitive polymer, a foam fracturing fluid and a preparation method and application thereof. The temperature-sensitive polymer comprises a structural unit A, a structural unit B, a structural unit C and a structural unit D derived from a hydrophobic monomer. The temperature-sensitive polymer has lower viscosity at the normal temperature, the viscosity is notreduced but is greatly increased at the relatively increased temperature of a stratum, and meanwhile, the temperature-sensitive polymer has a very good foam stabilizing performance. The foam fracturing fluid is good in component compatibility, foaming and sand carrying performance and high in fracture forming efficiency, the viscosity is increased along with temperature rise, and the foam fracturing fluid also has a temporary plugging function, and has wide application prospects in oil field exploitation, especially in a repeated fracturing technology.

Description

technical field [0001] The invention belongs to the field of oilfield exploitation, and in particular relates to a temperature-sensitive polymer, a foam fracturing fluid comprising the temperature-sensitive polymer, a preparation method and application thereof. Background technique [0002] At present, no matter vertical well or horizontal well, whether it is shale or sandstone, the refracturing technology is facing an urgent technical demand. Especially in foreign countries, refracturing technology is regarded as the main technology to reduce costs and increase efficiency. In other words, by refracturing to expand the affected area of ​​the first fracture (by extending the original old fractures or creating new main fractures or new branch fractures), the goal of less drilling and higher production can be achieved. Moreover, refracturing is not only the second fracturing of the same well and layer, but also the third or more repeated fracturing. [0003] The previous refr...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F220/22C08F226/02C09K8/68C09K8/70C09K8/88C09K8/94
CPCC08F220/56C09K8/685C09K8/703C09K8/887C09K8/94C08F220/06C08F220/22C08F226/02
Inventor 蒋廷学魏娟明肖博张旭东贾文峰沈子齐
Owner CHINA PETROLEUM & CHEM CORP
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