Clean fracturing fluid for low-temperature coal-bed gas reservoirs and application thereof

A technology for cleaning fracturing fluids and coalbed methane, applied in drilling compositions, production fluids, wellbore/well components, etc., can solve the problems of poor thickening ability, high price, poor temperature resistance, etc. Good temperature and shear resistance, low configuration cost and good sand-carrying performance

Inactive Publication Date: 2015-05-20
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this fracturing fluid is: there is no potassium chloride in the formula; the thickener is a mixture of quaternary ammonium salts with 12 to 18 carbon alkyls, which has poor thickening ability than octadecyltrimethylammonium chloride. Poor temperature resistance
The disa...

Method used

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  • Clean fracturing fluid for low-temperature coal-bed gas reservoirs and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The weight percentages of the components of the clean fracturing fluid are: octadecyltrimethylammonium chloride, 0.4%; sodium salicylate, 0.15%; potassium chloride, 1.0%; pH regulator, 0.06%; anti-residue agent , 0.08%; clear water, 98.31%.

[0030] Preparation of clean fracturing fluid: Add water into a large liquid mixing tank, add salicylate, potassium chloride, pH regulator and anti-residue agent in sequence under stirring conditions, and then add octadecyl trimethazine after completely dissolving ammonium chloride. Under stirring conditions, the concentration or viscosity of the liquid in the large tank is made uniform, and the obtained clean fracturing fluid is kept at 27°C for 100s -1 , shear for 10 minutes, the viscosity is 30mpa·s, and the sand sedimentation velocity is 0.128cm / min.

Embodiment 2

[0032] The weight percentages of the components of the clean fracturing fluid are: octadecyltrimethylammonium chloride, 0.3%; sodium salicylate, 0.15%; potassium chloride, 1.0%; pH regulator, 0.06%; anti-residue agent , 0.08%; clear water, 98.41%. Configure it as clean fracturing fluid, 27°C, 100s -1 , shear for 10 minutes, the viscosity is 25mpa·s, and the sand sedimentation velocity is 0.20cm / min.

Embodiment 3

[0034] The weight percentages of the components of the clean fracturing fluid are: cetyltrimethylammonium chloride, 0.4%; salicylate, 0.15%; potassium chloride, 1.0%; pH regulator, 0.06%; anti-residue agent , 0.08%; clear water, 98.31%. Configure it as clean fracturing fluid, 27°C, 100s -1 , sheared for 10 minutes, the viscosity was 25mpa·s, and the sand sedimentation velocity was 0.19cm / min.

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Abstract

The invention relates to a clean fracturing fluid for low-temperature coal-bed gas reservoirs and application thereof. The clean fracturing fluid for low-temperature coal-bed gas reservoirs is composed of 0.2-0.4% of cationic surfactant, 0.10-0.15% of salicylate, 1.0-1.5% of potassium chloride, 0.06% of pH regulator, 0.06-0.08% of residue preventer and the balance of water. The cationic surfactant is selected from cetyl trimethyl ammonium chloride, octadecyl trimethyl ammonium chloride or cetrimide. The preparation method comprises the following steps: adding the water into a large fluid preparation tank, sequentially adding the salicylate, potassium chloride, pH regulator and residue preventer under stirring conditions, adding the cationic surfactant after the previous components are completely dissolved, and stirring until the concentration or viscosity of the fluid in the big tank is uniform, thereby obtaining the clean fracturing fluid, wherein the application temperature for the fractured coal-bed gas reservoir is 15-30 DEG C.

Description

technical field [0001] The invention relates to the technical field of coalbed methane gas recovery, in particular to a fracturing fluid for coalbed gas fracturing reconstruction, which is a clean fracturing fluid suitable for low-temperature coalbed methane reservoirs. Background technique [0002] The permeability of coalbed methane reservoirs in my country is low, and the fracturing fluids used are mainly active water fracturing fluids and jelly fracturing fluids. Activated water fracturing fluid has been widely used in coal seam fracturing because of its simple preparation and less damage to coal seams. However, the scale of fracturing reconstruction is limited due to the influence of active water on its own rheology. At the same time, in order to ensure smooth sand addition, the construction displacement of active water fracturing fluid is usually high. In this way, the longitudinal extension of fractures is difficult to control, and it is difficult to form long propped...

Claims

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Application Information

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IPC IPC(8): C09K8/68E21B43/26
CPCC09K8/68C09K8/602C09K8/665E21B43/26
Inventor 谭宏强马超汤继丹喻鹏孙泽良文守成汪伟英祁丽莎戈月张承洲王雨
Owner PETROCHINA CO LTD
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