Thermosensitive polymer, foam fracturing fluid and preparation method and application thereof

A technology of foam fracturing fluid and polymer, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of rheological influence of fracturing fluid, poor foam quality, increased fluid loss, etc., to increase production The effect of improving seam efficiency, reducing filtration loss, and reducing the intrusion of water phase

Active Publication Date: 2022-07-12
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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  • Thermosensitive polymer, foam fracturing fluid and preparation method and application thereof
  • Thermosensitive polymer, foam fracturing fluid and preparation method and application thereof
  • Thermosensitive polymer, foam fracturing fluid and 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, and its composition is: temperature-sensitive polymer 0.4%, clay stabilizer 0.3%, foaming agent 0.2%, cross-linking agent 0.4%, water 98.7%, CO 2 gas.

[0075] The clay stabilizer is KCl and choline chloride, and the mass ratio of the two is 1:1; the foaming agent is perfluorolauryl polyoxyethylene ether and betaine, and the mass ratio of the two is 1:5; the cross-linking 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, acrylamide, acrylic acid, hexafluorobutyl methacrylate, and cetyldimethylallylammonium chloride, were sequentially added to deionized water as the total monomers until they were dissolved; in terms of mass percentage, the total The monomer accounts for 30% of the reaction solution, 50 parts of acrylamide, 45 parts of acrylic acid, 3 parts of hexafluorobutyl methacrylate,...

Embodiment 2

[0085] This example is to prepare a foam fracturing fluid system. 2 gas.

[0086] The clay stabilizer is KCl and choline chloride, and the mass ratio of the two is 1:1; the foaming agent is perfluorolauryl polyoxyethylene ether and betaine, and the mass ratio of the two is 1:5; the cross-linking 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, acrylamide, acrylic acid, hexafluorobutyl methacrylate, and cetyldimethylallylammonium chloride, were sequentially added in deionized water as the total monomers until they were dissolved; in terms of mass percentage, the total The monomer accounts for 30% of the reaction solution, 50 parts of acrylamide, 45 parts of acrylic acid, 3 parts of hexafluorobutyl methacrylate, 2 parts of cetyldimethylallyl ammonium chloride; in the above solution Add 30% aqueous sodium hydroxide solution to adjust the pH to 7.0 to ob...

Embodiment 3

[0096] This example is to prepare a foam fracturing fluid system, which is composed of: temperature-sensitive polymer 0.6%, clay stabilizer 0.3%, foaming agent 0.2%, cross-linking agent 0.6%, water 98.3%, CO 2 gas.

[0097] The clay stabilizer is KCl and choline chloride, and the mass ratio of the two is 1:1; the foaming agent is perfluorolauryl polyoxyethylene ether and betaine, and the mass ratio of the two is 1:5; the cross-linking 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, acrylamide, acrylic acid, hexafluorobutyl methacrylate, and cetyldimethylallylammonium chloride, were sequentially added in deionized water as the total monomers until they were dissolved; in terms of mass percentage, the total The monomer accounts for 30% of the reaction solution, 50 parts of acrylamide, 45 parts of acrylic acid, 3 parts of hexafluorobutyl methacrylate, 2...

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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 includes the following structural unit A, structural unit B and structural unit C, and structural unit D derived from a hydrophobic monomer. The temperature-sensitive polymer has a relatively low viscosity at normal temperature, and at a relatively elevated temperature of the formation, the viscosity not only does not decrease but increases substantially, and at the same time, it has good foam stability. The foam fracturing fluid has good compatibility of each component, good foaming and sand-carrying properties, high fracture-making efficiency, increased viscosity with temperature increase, and has the function of temporary plugging, and is used in oilfield exploitation, especially in repeated fracturing The technology has broad application prospects.

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, and a preparation method and application thereof. Background technique [0002] At present, re-fracturing technology is facing urgent technical demands whether in vertical wells or horizontal wells, whether in shale or sandstone. Especially in foreign countries, re-fracturing technology is used as the main technology to reduce costs and increase efficiency. In other words, by refracturing to expand the first fracture swept area (by extending the original old fractures or creating new main fractures or new branch fractures), the goal of drilling less wells while increasing production can be achieved. Moreover, re-fracturing is not only the second fracturing in the same well and the same layer, but also the third and above re-fracturing. [0003] The previous re-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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