Carbon dioxide fracturing fluid and preparation method thereof

A technology of carbon dioxide and fracturing fluid, which is applied in the direction of chemical instruments and methods, bulk chemical production, drilling compositions, etc., can solve the problems of fracture creation and sand-carrying capacity reduction, so as to reduce the viscosity of crude oil and benefit the environment Protective, promising effect

Inactive Publication Date: 2014-11-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the technologies disclosed in these patent applications, the fracturing fluid forms foam after entering the ground, and the fracture creation and sand-carrying capacity will be significantly reduced

Method used

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  • Carbon dioxide fracturing fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of liquid carbon dioxide fracturing fluid: Take the high-temperature and high-pressure closed system of MARSⅡ rheometer of HAAKE company, add 0.1wt% thickener polycarbonate-chlorostyrene copolymer and 0.01wt% multi-effect additive perfluorinated to it Sodium alkylbenzene sulfonate is loaded into the inner rotor and inner magnetic steel, the upper cover is installed, and the inner hexagonal bolts are tightened to seal the high-temperature and high-pressure closed system. Using a carbon dioxide steel cylinder, press 99.89wt% liquid carbon dioxide into the high-temperature, high-pressure closed system through the injection valve, set the instrument to rotate the inner rotor, and speed up the dissolution of the thickener and multi-effect additive. The pressure is increased to keep the carbon dioxide in a liquid state in the closed system. After setting the instrument to stir at room temperature for 30 minutes, the thickener and multi-effect additives are dissolv...

Embodiment 2

[0024] Preparation of liquid carbon dioxide fracturing fluid: In Example 1, change "add 0.1wt% thickener polycarbonate-chlorostyrene copolymer and 0.01wt% multi-effect additive sodium perfluoroalkylbenzene sulfonate" to " Add 0.5wt% thickener polycarbonate-methylstyrene copolymer and multi-effect additive sodium perfluoroalkylbenzene sulfonate 0.1wt% and sodium perfluorooctane sulfonate 0.1wt%, correspondingly press the Enter 99.89wt% liquid carbon dioxide " into " press into 99.3wt% liquid carbon dioxide ", all the other steps are with embodiment 1.

[0025] The methods for testing the viscosity of liquid carbon dioxide fracturing fluid in Examples 2-6 are the same as those in Example 1. The test results are shown in Table 1.

Embodiment 3

[0027] Preparation of liquid carbon dioxide fracturing fluid: In Example 1, change "add 0.1wt% thickener polycarbonate-chlorostyrene copolymer and 0.01wt% multi-effect additive sodium perfluoroalkylbenzene sulfonate" to " Add 1.0wt% thickener polycarbonate-chlorostyrene copolymer and 0.3wt% multi-effect additive sodium perfluorooctane sulfonate", and correspondingly change "press into 99.89wt% liquid carbon dioxide" to "press Enter 98.7wt% liquid carbon dioxide ", all the other steps are with embodiment 1.

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Abstract

The invention provides a carbon dioxide fracturing fluid and a preparation method thereof. The carbon dioxide fracturing fluid is a non-water fracturing fluid, and the fracturing fluid contains carbon dioxide, a thickening agent and a multi effect additive used to reduce the interfacial tension between underground fluids and the fracturing fluid. The carbon dioxide fracturing fluid has high viscosity at a certain temperature and in a certain shear rate, the viscosity temperature performance is mainly controlled by temperature, and is in nonsignificant relationship with shear time, and the carbon dioxide fracturing fluid can satisfy the fracturing fluid crack making and sand carrying technical requirements of the fracturing process on the fracturing fluid. The non-water fracturing fluid provided by the invention can greatly reduce the environment stress of the fracturing technology on fresh water and waste liquid processing, can be used for production increase and development of oil and gas fields, and is especially suitable for the development of severe water sensitive reservoirs and non conventional resources.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a carbon dioxide fracturing fluid and a preparation method thereof. Background technique [0002] Oil and gas resources are stored in the pores, caves and fractures of underground rocks, and flow in these storage spaces. If the storage space and pores of the underground reservoir are large, oil and gas are easy to seep and produce after drilling. At present, high-permeability, high-yield, and high-quality oil and gas resources worldwide have entered the middle and late stages of development. A large number of oil and gas resources newly discovered and put into development are low-permeability and ultra-low-permeability reservoirs. Most of them have no natural production after drilling and need to rely on hydraulic pressure. Fracture technology to achieve oil and gas production. [0003] Since the middle of the last century, hydraulic fracturing has been th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/64C09K8/70
CPCC09K8/594C09K8/64C09K8/80Y02P20/54
Inventor 赵梦云苏建政张锁兵张大年马玉生
Owner CHINA PETROLEUM & CHEM CORP
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