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Oil-based fracturing fluid for compact oil and gas reservoirs and preparation method of fluid

A technology of imitating oil-based fracturing fluid, which is applied in the field of imitating oil-based fracturing fluid and its preparation, can solve the problems of high cost, high frictional resistance, and high safety and environmental protection requirements of oil-based fracturing fluid, so as to improve the productivity of a single well. , Overcome the high cost and reduce the effect of damage

Inactive Publication Date: 2019-05-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems of high cost of oil-based fracturing fluid, high frictional resistance, and high requirements for safety and environmental protection, the present invention provides an imitation oil-based fracturing fluid for tight oil and gas reservoirs and its preparation method. The fracturing fluid provided by the present invention The fracturing fluid has the characteristics of oil-based fracturing fluid to inhibit clay expansion and reduce damage to the reservoir. At the same time, it overcomes the shortcomings of oil-based fracturing fluid, such as high cost, high friction resistance, and high requirements for safety and environmental protection

Method used

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  • Oil-based fracturing fluid for compact oil and gas reservoirs and preparation method of fluid
  • Oil-based fracturing fluid for compact oil and gas reservoirs and preparation method of fluid
  • Oil-based fracturing fluid for compact oil and gas reservoirs and preparation method of fluid

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Embodiment 1

[0024] In order to overcome the problems of high cost of oil-based fracturing fluid, high frictional resistance, and high requirements for safety and environmental protection, the present invention provides such figure 1 and figure 2 Shown is an imitation oil-based fracturing fluid for tight oil and gas reservoirs and its preparation method. The fracturing fluid provided by the invention has the characteristics of oil-based fracturing fluid inhibiting clay expansion, reducing damage to reservoirs, and at the same time, It also overcomes the shortcomings of oil-based fracturing fluid, such as high cost, high friction resistance, and high requirements for safety and environmental protection. The invention is used to realize the fracturing reconstruction measures of the tight oil and gas reservoir, reduce the damage of the fracturing fluid to the reservoir, and increase the output of a single well.

[0025] This example provides an imitation oil-based fracturing fluid for tight...

Embodiment 2

[0039] This example provides an imitation oil-based fracturing fluid for tight oil and gas reservoirs. The components and mass percentages of the imitation oil-based fracturing fluid are as follows: 0.9% thickener, 0.5% clay hydration swelling inhibitor, and 8% glucoside, 3% polyethylene glycol, 1.0% potassium chloride, 0.1% fungicide, 0.06% borax, 0.2% temperature stabilizer, 0.8% ammonium persulfate, and the balance is water.

[0040] Specifically, the thickener is a copolymer of acrylamide, N-alkylacrylamide, and N-vinylpyrrolidone.

[0041] Specifically, the copolymer of acrylamide, N-alkylacrylamide, and N-vinylpyrrolidone is prepared by the following method: the specific steps are:

[0042] The acrylamide, N-alkylacrylamide, and N-vinylpyrrolecyclone are mixed in a molar ratio of 7:(0.5-1):2, and the polymerization reaction is carried out at 40-60°C, and the reaction time is 6-8h , to obtain the copolymer of the acrylamide, N-alkylacrylamide, N-vinylpyrrolidone.

[004...

Embodiment 3

[0053] In this example, an imitation oil-based fracturing fluid for tight oil and gas reservoirs is provided, and its components and mass percentages are as follows: 0.4% thickener, 0.4% clay hydration swelling inhibitor, 7% methyl glucoside, 2% polyethylene glycol, 1.0% potassium chloride, 0.1% bactericide, 0.05% borax, 0.1% temperature stabilizer, 0.6% ammonium persulfate, and the balance is water. The sum of the above components is 100%. Thickener, clay hydration swelling inhibitor, methyl glucoside, polyethylene glycol, bactericide, potassium chloride and water constitute the base liquid, and borax, temperature stabilizer and ammonium persulfate constitute the cross-linking agent.

[0054] Specifically, the thickener is a copolymer of acrylamide, N-alkylacrylamide, and N-vinylpyrrolidone.

[0055] Specifically, the copolymer of acrylamide, N-alkylacrylamide, and N-vinylpyrrolidone is prepared by the following method:

[0056] The acrylamide, N-alkylacrylamide, and N-vinyl...

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Abstract

The invention provides an oil-based fracturing fluid for compact oil and gas reservoirs. The oil-based fracturing fluid comprises the following components in percentage by mass: 0.3-0.9% of a thickening agent, 0.2-0.5% of a clay hydration expansion inhibitor, 6-8% of methyl glucoside, 1-3% of polyethylene glycol, 0.5-1.0% of potassium chloride, 0.05-0.1% of a bactericide, 0.04-0.06% of borax, 0.1-0.2% of a temperature stabilizer, 0.4-0.8% of ammonium persulfate and the rest of water. The oil-base fracturing fluid can greatly reduce the damage to the compact oil and gas reservoirs with high shale content, and thus the improvement of single well production is realized. The oil-based fracturing fluid overcomes the defects of high cost, large friction and more safety and environmental protection risk points of the oil-based fracturing fluid, and can more effectively improve quality and efficiency and improve single well productivity.

Description

technical field [0001] The invention belongs to the technical field of oilfield fracturing, and in particular relates to an imitation oil-based fracturing fluid for tight oil and gas reservoirs and a preparation method thereof. Background technique [0002] In my country's recoverable oil resources, tight oil accounts for about 2 / 5, and with the development of oil resources, this proportion will continue to increase. Tight oil and gas reservoirs are characterized by low permeability (﹤0.1mD) and low porosity (generally﹤10%). The pore connectivity is poor, the pore extension is relatively long, and it is ribbon-shaped. At the same time, the shale content increases, and authigenic clay minerals and impurities High base content. Therefore, reservoir protection is critical to well production. For tight oil and gas reservoirs, in order to obtain economic production, it is necessary to carry out fracturing of the reservoir. During the fracturing process, a large amount of fractu...

Claims

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Application Information

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IPC IPC(8): C09K8/68C09K8/88C08F220/56C08F220/54C08F226/10
Inventor 杨立安慕立俊李建山吕宝强顾燕凌何衡黄婷李建辉常笃康博
Owner PETROCHINA CO LTD