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Slick water fracturing fluid composition, slick water fracturing fluid and application of slick water fracturing fluid

A technology for hydraulic fracturing and composition, which is applied to drilling compositions, wellbore/well components, chemical instruments and methods, etc., can solve problems such as production reduction of oil and gas wells, and achieve improved imbibition recovery and low surface area. Tension, the effect of increasing the yield-increasing effect

Pending Publication Date: 2022-07-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a slick water fracturing fluid composition, slick water fracturing fluid and application thereof, so as to solve the problem in the prior art that the fracturing fluid stays in the reservoir and causes oil and gas wells to reduce production

Method used

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  • Slick water fracturing fluid composition, slick water fracturing fluid and application of slick water fracturing fluid
  • Slick water fracturing fluid composition, slick water fracturing fluid and application of slick water fracturing fluid

Examples

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preparation example Construction

[0024]In order to improve the activation effect of the biological oil-displacing agent of the present application on the endogenous microorganisms in the oil layer, thereby improving the recovery rate of the slick water fracturing fluid to crude oil, it is preferable that the above-mentioned biological oil-displacing agent is the one whose deposit number is CGMCC No.6614. The organic nutrient solution obtained by fermentation of Bacillus aerobicans, the organic nutrient solution includes glycolipids and alkyl chain compounds. In order to obtain a biological oil-displacing agent with the best biological activity, preferably, the preparation method of the above-mentioned biological oil-displacing agent comprises: fermenting and culturing yeast in a fermentation medium to obtain a culture liquid; Obtain bacterial cells and clear liquid; extract and separate the clear liquid to obtain an organic nutrient solution, and the fermentation medium includes 5-10 g / L carbon source, 5-10 g / ...

Embodiment 1

[0038] 1 part vinyl acetate, 20 parts acrylamide, 2 parts acrylic acid, 1 part ethoxylated-2-hydroxyethyl methacrylate, 10 parts polyvinylbenzyltrimethylammonium chloride, 1 part chlorine Sodium chloride, 1 part of sodium sulfate, 0.1 part of dibenzoyl peroxide, and 63.9 parts of water were mixed and reacted at 25° C. for 6 hours to obtain a polyacrylamide-based drag reducer.

[0039] Additives were obtained by mixing 20 parts of polydimethyldiallyl ammonium chloride, 20 parts of polyether surfactant, 5 parts of potassium chloride and 55 parts of water.

[0040] Fermentation medium: 5g / L paraffin, 5g / L pyocyanin, 3g / L molasses, 3g / L NH 4 NO 3 , 2.0g / L of K 2 HPO 4 , 0.2g / L MgSO 4 , the balance is water, and a fermentation medium with a pH value of about 7.0 is obtained. After inoculating yeast (Bacillus aerobicans with a deposit number of CGMCC No. 6614) at an inoculation amount of 1 g / L, it was shaken at 60°C and 200 rpm / min for 100 hours to obtain a culture solution. T...

Embodiment 2

[0043] The difference between Example 2 and Example 1 is that 0.50 part of polyacrylamide drag reducing agent, 0.20 part of additive, 0.50 part of biological oil displacement agent and 98.80 part of water are mixed to obtain slick water fracturing fluid.

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PUM

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Abstract

The invention provides a slickwater fracturing fluid composition, slickwater fracturing fluid and application of the slickwater fracturing fluid composition and the slickwater fracturing fluid. The slick water fracturing fluid composition is prepared from the following components in percentage by mass: 0.05 to 0.50 percent of a polyacrylamide drag reducer, 0.40 to 0.60 percent of a biological oil displacement agent, 0.10 to 0.30 percent of an additive and 99.05 to 99.25 percent of water. According to the slick water fracturing fluid composition, on one hand, crude oil can form an emulsion with oil-in-water as a main component, the good cleaning, stripping, displacement and oil-water replacement achieving effects are achieved, and the recovery rate of the crude oil can be increased easily; on the other hand, through the full synergistic effect of the polyacrylamide drag reducer, the biological oil displacement agent and the additive, the effect of integrating fracturing, three-production is achieved. And the fracturing fluid does not need gel breaking and is a green and environment-friendly biochemical engineering material, and the flowback fluid has no pollution to the environment, does not need wastewater treatment and can be repeatedly used, so that the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of slick water fracturing fluid, in particular to a slick water fracturing fluid composition, slick water fracturing fluid and applications thereof. Background technique [0002] At present, in the process of unconventional tight oil and gas development, volume fracturing has gradually become the main measure for reservoir reconstruction of such oil and gas reservoirs. In order to meet the needs of stimulation and reconstruction of low-permeability oilfields, slick water fracturing construction methods with large fluid volume and high displacement are usually used. Due to the comprehensive influence of multiple factors such as reservoir physical properties, fracturing technology, and flowback system in low-permeability oilfields, a large amount of fracturing fluid remains in micro-fractures and matrix pores. It will be immersed in the fracturing fluid that is not flowed back for a long time. The long-term ...

Claims

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Application Information

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IPC IPC(8): C09K8/68C09K8/88C09K8/86E21B43/26E21B43/22C08F257/00C08F220/56C08F218/08C08F220/06
CPCC09K8/68C09K8/86C09K8/882C09K8/885E21B43/26E21B43/16C08F257/00C09K2208/12C09K2208/28C08F220/56C08F218/08C08F220/06
Inventor 吕振虎董景锋潘竟军汪志臣王佳张敬春张凤娟余维初麦尔耶姆古丽·安外儿王牧群罗滕周东魁
Owner PETROCHINA CO LTD
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