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Methanol-based fast-dissolving cross-linking fracturing fluid system, and preparation method and application thereof

A methanol aqueous solution, methanol-based technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as water insensitivity

Inactive Publication Date: 2019-07-09
四川洁能锐思石油技术有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fracturing fluid system used in the prior art has the problem of insensitivity to water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0020] The present invention also provides a method for preparing the methanol-based instant cross-linked fracturing fluid system described in the above technical solution, comprising the following steps:

[0021] Mix 2-acrylamide-2-methylpropanesulfonic acid, methacryloxyethyltrimethylammonium chloride, methanol aqueous solution and acrylamide to obtain the methanol-based instant cross-linked fracturing fluid system.

[0022] In the present invention, there is no special limitation on the mixing method and the order of adding the raw materials, and the solutions well known to those skilled in the art can be adopted.

[0023] When the methanol-based instant cross-linked fracturing fluid system contains liquid carbon dioxide, the preparation method of the present invention is preferably carried out under the condition that the carbon dioxide is in a liquid state.

[0024] The present invention also provides the application of the methanol-based instant cross-linked fracturing f...

Embodiment 1

[0027] A methanol-based instant cross-linked fracturing fluid system, comprising the following components in mass fractions: 2% of 2-acrylamide-2-methylpropanesulfonic acid, 80% of methacryloxyethyltrimethylammonium chloride , 15% methanol aqueous solution, wherein the concentration of methanol in the methanol aqueous solution is 90wt% and the balance is acrylamide.

[0028] The invention mixes 2-acrylamide-2-methylpropanesulfonic acid, methacryloyloxyethyltrimethylammonium chloride, methanol aqueous solution and acrylamide to obtain the methanol-based instant cross-linked fracturing fluid system.

[0029] Performance Testing:

[0030] Use the MAS-Ⅲ high-temperature and high-pressure rheometer to test: install the fracturing fluid and set the heating temperature of the rheometer, and determine the shear stability of the fracturing fluid system by the trend of apparent viscosity over time. -1 The viscosity remained above 50mPa·s after shearing for 1h.

[0031] After testing, ...

Embodiment 2

[0033] A methanol-based instant cross-linked fracturing fluid system, comprising the following components in mass fractions: 8% 2-acrylamide-2-methylpropanesulfonic acid, 50% methacryloyloxyethyltrimethylammonium chloride , 15% methanol aqueous solution, wherein the concentration of methanol in the methanol aqueous solution is 90wt% and the balance is acrylamide.

[0034] The invention mixes 2-acrylamide-2-methylpropanesulfonic acid, methacryloyloxyethyltrimethylammonium chloride, methanol aqueous solution and acrylamide to obtain the methanol-based instant cross-linked fracturing fluid system.

[0035] The performance test method of the methanol-based instant cross-linked fracturing fluid system is the same as in Example 1, and the results are as follows:

[0036] At 130℃, 170s -1 The viscosity remained above 50mPa·s after shearing for 1h.

[0037] After testing, the methanol-based instant cross-linked fracturing fluid system prepared in this example was instant dissolved i...

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Abstract

The invention provides a methanol-based fast-dissolving cross-linking fracturing fluid system, and a preparation method and an application thereof, and belongs to the field of oil and gas well drilling and exploitation. In the present invention, methacryloyloxyethyltrimethylammonium chloride can be dissolved in methanol. The data of the embodiment show that the methanol-based fast-dissolving cross-linking fracturing fluid system provided by the invention can achieve fast dissolving within 10 s, and the viscosity is maintained at 50 mPa*s or more after shearing is conducted for 1 h under conditions of 130 DEG C and 170 s<-1>, and the fracturing fluid system can satisfy high-water-sensitivity formation oil and gas well drilling and exploitation industrial application.

Description

technical field [0001] The invention relates to the technical field of drilling and production of oil and gas wells, in particular to a methanol-based instant cross-linked fracturing fluid system and its preparation method and application. Background technique [0002] In recent years, with the adjustment of the national energy structure, coalbed methane, an important part of unconventional oil and gas with huge reserves and great impact on environmental protection, has gradually become one of the key objects of exploration and development of unconventional oil and gas resources in my country. [0003] The storage environment and storage state of coalbed methane determine that fracturing is an important way to achieve rapid production increase and effective development of coalbed methane. The fracturing fluid system used in the prior art has the problem of insensitivity to water. Contents of the invention [0004] In view of this, the object of the present invention is to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/70
CPCC09K8/665C09K8/68C09K8/703
Inventor 赵仁凤陈守雨唐菲利穆巍柏清刘雅红
Owner 四川洁能锐思石油技术有限公司