Novel active water fracturing fluid for fracturing of coal bed gas well

A water fracturing and active technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of increasing construction difficulty, non-dispersion of coal powder, increasing the number of pump inspections, etc., and achieves simple and easy configuration process, Coal seam damage is small and the effect of easy flowback

Inactive Publication Date: 2011-01-19
CHINA UNITED COALBED METHANE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used active water fracturing fluid is generally composed of water, anti-swelling agent (commonly used potassium chloride) and drainage aid (usually a compound of surfactants, commonly used drainage aids in oil fields include D-60 and HP-8, etc.) Prepared according to a certain ratio, the active water fracturing fluid exhibits the following defects during fracturing construction: (1) high frictional resistance, which limits the construction displacement, thereby limiting the construction scale and affecting the fracturing effect; (2) It has no dispersing effect on the pulverized coal produced during the fra

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 20g of potassium chloride, 0.1g of sodium lignosulfonate solid powder and 0.4g of anionic polyacrylamide solid powder into 1000ml of clear water, stir to dissolve them fully, and form a new type of active water fracturing fluid for coalbed methane wells. In the new active water fracturing fluid formed, potassium chloride accounts for 2% of the clear water mass, sodium lignosulfonate accounts for 0.01% of the clear water mass, and anionic polyacrylamide solid powder accounts for 0.04% of the clear water mass. The new type of active water fracturing fluid can be used in the fracturing reconstruction of coal seams with hard coal seams and less coal dust. During fracturing, it can be used in the order of pre-fluid, sand-carrying fluid and displacement fluid.

Embodiment 2

[0028] Add 20g of potassium chloride, 1g of 10% sodium lignin sulfonate aqueous solution and 40g of 1% anionic polyacrylamide aqueous solution into 1000ml of clear water, and stir to fully dissolve them to form a new type of active water for coalbed methane wells. Fracturing fluid. In the new active water fracturing fluid formed, potassium chloride accounts for 2% of the clear water quality, 10% sodium lignosulfonate aqueous solution accounts for 0.1% of the clear water quality, and 1% anionic polyacrylamide aqueous solution accounts for 4% of the clear water quality . The new type of active water fracturing fluid can be used in the fracturing reconstruction of coal seams with hard coal seams and less coal dust. During fracturing, it can be used in the order of pre-fluid, sand-carrying fluid and displacement fluid.

Embodiment 3

[0030] Add 20g of potassium chloride, 0.1g of sodium lignosulfonate solid powder and 0.6g of non-ionic polyacrylamide solid powder into 1000ml of water containing more calcium and magnesium ions, and stir to make them fully dissolved to form a new type of active material for coalbed methane wells. Water fracturing fluid. In the new active water fracturing fluid formed, potassium chloride accounts for 2% of the clean water mass, sodium lignosulfonate accounts for 0.01% of the clean water mass, and drag reducing agent accounts for 0.06% of the clean water mass. The prepared new active water fracturing fluid can be used in the fracturing reconstruction of coal seams with high water hardness for on-site liquid preparation, hard coal seams and less coal dust. During fracturing, it can be used in the order of pre-fluid, sand-carrying fluid and displacement fluid.

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PUM

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Abstract

The invention relates to a fracturing fluid for the fracturing construction of coal bed gas well. In general, a coal bed gas well cannot be put into operation before the fracturing construction. Owing to the characteristics of small harm, low cost, convenient preparation and the like, the active water is extensively applied to the fracturing construction of coal bed gas well. The typical active water fracturing fluid is generally prepared from clear water, anti-swelling agent (typically potassium chloride) and cleanup additive (typically complex of surfactants, typical cleanup additive for oil field is D-60 and HP-8, etc.) based on certain proportions. The active water fracturing fluid shows, when being used for the fracturing construction, the defects of high frictional resistance and no dispersion effect on coal dusts generated in the process of the fracturing construction. The active water fracturing fluid according to the invention is prepared in a manner of adding the typical active water fracturing fluid with drag-reducing agent (anionic or nonionic polyacrylamide) and coal dust dispersing agent (lignosulfonate, such as sodium lignin sulfonate) based on the mass percents as below: 1%-2% of potassium chloride, 0.02% to 0.06% of drag-reducing agent and 0.01% to 0.03% of dispersing agent. The fracturing fluid according to the invention has the characteristics of simple formula, the effect of reducing frictional resistance of construction tubular columns and uniformly dispersing coal dusts, small harm to coal bed and easy flowback.

Description

technical field [0001] The invention relates to the technical field of coalbed gas well fracturing and production stimulation, and is a fracturing fluid, in particular to a novel active water fracturing fluid with the functions of anti-swelling, reducing resistance and dispersing coal powder for coalbed gas well fracturing construction. Background technique [0002] Coalbed methane reservoirs are characterized by low porosity and permeability, and low natural production capacity. Fracturing is often required to obtain industrial production and realize economical mining. Fracturing fluid is the working fluid in the process of fracturing construction, which plays the role of creating fractures and carrying proppant into the formation. Commonly used fracturing fluids for coalbed methane well fracturing operations include: active water fracturing fluid, linear gel fracturing fluid, cross-linked gel fracturing fluid (including viscoelastic surfactant fracturing fluid) and foam fr...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 郭本广张劲傅小康张平孟尚志赵军林鑫莫日和
Owner CHINA UNITED COALBED METHANE
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