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Coal bed pressing crack liquid method

A fracturing fluid and coal seam technology, applied in the field of coal seam fracturing fluid fracturing, to save costs, reduce damage, and improve low permeability

Inactive Publication Date: 2014-12-10
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former is difficult to achieve due to technical and economic problems; the latter mostly uses high-viscosity fracturing fluids such as guar gum, but low-temperature gel breaking has always been a difficult obstacle to solve

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0016] Embodiment: A coal seam fracturing hydraulic fracturing method includes the following steps in sequence: (1) selecting the type of high-viscosity fracturing fluid used in coal seam hydraulic fracturing; Determine the minimum concentration of chlorine dioxide in the selected fracturing fluid gel breaking experiment; (3) determine the total amount of chlorine dioxide according to the amount of fracturing fluid and the concentration of chlorine dioxide; Hydraulic fracturing is carried out using the liquid-displacement fluid procedure, in which the chlorine dioxide added to the pre-fluid accounts for 70%, and the chlorine dioxide added to the displacement fluid accounts for 30%. 3 Active water or clean water is used as spacer fluid; (5) Flowback of fracturing fluid can start 2-4 hours after the end of hydraulic fracturing. In this example, the time is selected as 3 hours; (6) Effect test, the main indicators include fracturing Fluid flowback volume, viscosity and damage deg...

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PUM

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Abstract

The invention relates to a method for pressing crack a coal bed pressing crack liquid, which sequentially comprises the following steps of: (1) selecting high-viscosity pressing crack liquid types used for the coal bed hydraulic cracking; (2) carrying out glue breaking experiments on pressing crack liquid adopted by chlorine dioxide indoors under the condition of the coal bed temperature and determining the minimum concentration of the chlorine dioxide; (3) determining the total quality of the chlorine dioxide according to the quantity of the pressing crack liquid and the concentration of the chlorine dioxide; (4) carrying out hydraulic pressing crack according to a procedure of prepad liquid, sand containing liquid and replacing liquid, wherein the chlorine dioxide added in the prepad liquid accounts for 70 percent, the chlorine dioxide added in the replacing liquid accounts for 30 percent, and not less than 10m<3> of active water or clean water is pumped and injected among the prepad liquid, the replacing liquid and the sand containing liquid for being used as isolation liquid; (5) starting to do pressing crack liquid backflow after the waiting for 2 to 4 hours from the completion of the hydraulic pressing crack; and (6) checking effects with the main indexes including the pressing crack liquid backflow quantity, the viscosity and the damage degree of the pressing crack liquid on the coal bed. The coal bed pressing crack liquid system has the advantages that the high-viscosity pressing crack liquid can realize fast glue breaking backflow at the coal bed temperature, and the damage to the coal storage layer is reduced.

Description

technical field [0001] The invention relates to a coal seam fracturing hydraulic fracturing method. Background technique [0002] Coal seam hydraulic fracturing is the main way to develop coalbed methane and improve gas drainage. The type of fracturing fluid and its change in the whole process are the key factors for the successful operation of hydraulic fracturing. Compared with traditional oil and gas reservoirs, the temperature of coal reservoirs is generally higher. Low, which is extremely unfavorable to the gel breaking of high-viscosity fracturing fluid, and the incomplete gel breaking will cause serious damage to the coal reservoir, and even completely cancel the permeability enhancement effect of hydraulic fracturing. [0003] Jelly, linear glue, clean and other types of high-viscosity fracturing fluids have high sand-carrying capacity, and are widely used in hydraulic fracturing of oil and gas reservoirs. After the proppant is brought into the fracture by the fluid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26C09K8/62
Inventor 苏现波马耕李伍成郭红玉辛新平陶云奇
Owner HENAN POLYTECHNIC UNIV
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