Low-cost water-based clean fracturing fluid and gel breaking fluid used for fracturing

A technology for cleaning fracturing fluids and fracturing fluids, applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve problems such as pollution, and achieve the effects of convenient construction, cost saving, and low construction friction

Active Publication Date: 2010-04-14
CHINA UNITED COALBED METHANE NAT ENGRES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is made to solve the above technical problems, and its purpose is to provide a low-cost water-based clean fracturing fluid for fracturing, which can solve the problem of fracturing fluid well. The problem of pollution to coal seams, while greatly improving the sand-carrying performance of fracturing fluids, its price is only 1.5-2.0 times that of active water fracturing fluids, far lower than guar gum fracturing fluids and ordinary clean fracturing fluids

Method used

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  • Low-cost water-based clean fracturing fluid and gel breaking fluid used for fracturing
  • Low-cost water-based clean fracturing fluid and gel breaking fluid used for fracturing
  • Low-cost water-based clean fracturing fluid and gel breaking fluid used for fracturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 16-18 alkyl-3-methyl ammonium chloride (that is, use any one of 16-18 alkyl-3-methyl ammonium chloride or their mixture), sodium salicylate, small cationic anti-expansion The agent (the main component is 12-alkyl-3-methylammonium chloride) is prepared according to the following concentration: 0.2% 16-18 alkyl-3-methylammonium chloride + 0.06% sodium salicylate + 0.4% small Cationic anti-swelling agent (the main component is 12-alkyl-3-methylammonium chloride), that is, the concentration of 16-18 alkyl-3-methylammonium chloride in the fracturing fluid is 0.2%, sodium salicylate The concentration of the small cationic anti-swelling agent is 0.06%, and the concentration of the small cationic anti-swelling agent is 0.4%. Stir until uniform, forming a clear and translucent clean fracturing fluid with a certain viscosity.

[0029] Weigh the octylphenol polyoxyethylene (10) ether ( OP-10 for short), add the weighed octylphenol polyoxyethylene (10) ether into the water with th...

Embodiment 2

[0031] According to 0.3% 16-18 alkyl-3-methyl ammonium chloride (that is, one of 16-18 alkyl-3-methyl ammonium chloride) + 0.09% sodium salicylate + 0.4% small cationic anti-swelling agent (The main ingredient is 12-alkyl-3-methylammonium chloride) formula to make a clean fracturing fluid.

[0032] The preparation and injection sequence of the gel breaker is the same as in Example 1, and it is used together with the active water fracturing fluid during fracturing, that is, the active water fracturing fluid is used as the front fluid, and the clean fracturing fluid is used as the sand-carrying fluid. 3 Under the displacement of / min, the maximum sand ratio can reach more than 50%, and the average sand ratio can reach more than 20%.

Embodiment 3

[0034] Press 0.4-0.6% 16-18 alkyl-3-methyl ammonium chloride (that is, use one of 16-18 alkyl-3-methyl ammonium chloride) + 0.12-0.18% sodium salicylate + 0.4% small The cationic anti-swelling agent (the main component is 12-alkyl-3-methylammonium chloride) is formulated to prepare a clean fracturing fluid, in which 16-18 alkyl-3-methylammonium chloride: sodium salicylate is guaranteed =1:0.3 (mass ratio).

[0035]The preparation and injection sequence of the gel breaker is the same as that in Example 1. It is used together with the active water fracturing fluid during fracturing, that is, the pre-flush uses the active water fracturing fluid, and the sand-carrying fluid uses clean fracturing fluid. 3 Under the displacement of / min, the average sand ratio can reach 25%.

[0036] Low-cost clean fracturing fluid has the characteristics of low friction, good fracture creation, less filtration loss, strong sand-carrying performance, thorough gel breaking, and easy flowback after f...

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Abstract

The invention provides a water-based clean fracturing fluid for fracturing. The fracturing fluid is formed by a small canonic antiswelling agent, organic sodium salt, a cationic surface active agent and water, wherein the concentration of the small canonic antiswelling agent is 0.4 percent by mass, the concentration of the organic sodium salt is 0.06 to 0.18 percent by mass, the concentration of the cationic surface active agent is 0.2 to 0.6 percent by mass, the mass ratio of the cationic surface active agent and the organic sodium salt is 1:0.3, the organic sodium salt is sodium salicylate, and the cationic surface active agent is any one or the mixture of 16-18 alkyl-3-methylammonium chloride. The invention can well solve the pollution problem of the fracturing fluid to the coal bed, simultaneously improve the sand-carrying performance of the fracturing fluid greatly, the price thereof is only 1.5 to 2.0 times of active water fracturing fluid and is far lower than that of guargum fracturing fluid and common clean fracturing fluid.

Description

technical field [0001] The present invention relates to a treatment agent for reforming oil and gas reservoirs and coalbed methane reservoirs, in particular to a water-based clean fracturing fluid and gel breaking agent with low damage, high sand-carrying capacity and low cost for fracturing of oil and gas wells and coalbed methane wells liquid. Background technique [0002] Coal is an unconventional reservoir with low Young's modulus, high Poisson's ratio, low hardness, and is easily broken. It is composed of two parts: matrix and fractures. Coal bed gas is mainly attached to the inner surface of coal bed matrix micropores in an adsorbed state. , the fracture system is the main channel for coal seam fluid (gas and water) migration. The fracture system of coal seams is affected by many factors. Poor connectivity and low permeability are the fatal flaws of coal reservoirs. Therefore, fracturing is needed to improve the conductivity of coal seams. Conventional vertical coalbe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
Inventor 李曙光孙斌刘川庆
Owner CHINA UNITED COALBED METHANE NAT ENGRES CENT
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