Clean fracturing fluid for coal bed fracturing

A clean fracturing fluid and fracturing technology, applied in the direction of drilling composition, production fluid, wellbore/well components, etc., can solve the problems of poor shear resistance, complex configuration, poor water solubility, etc., and reach the reservoir Small damage, low friction, good gel breaking performance

Inactive Publication Date: 2015-02-04
BEIJING JIUZUN ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The thickener used in the prior art is cetyl-octadecyltrimethylammonium bromide, which has poor water solubility at low temperature and poor shear resistance; the fracturing fluid has poor anti-swelling and gel-breaking properties
And there is a defect of complex configuration

Method used

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  • Clean fracturing fluid for coal bed fracturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The clean fracturing fluid of this example was used to perform fracturing reconstruction on the No. 3 coal seam of the Permian Shanxi Formation in Well 2701-36. The well section was 544.76-550.83m, the thickness was 6.07m, the temperature was 15°C, and the fracturing displacement was 4.5m 3 / min, add sand 60m 3 , the average sand ratio is 26%, and the highest sand ratio reaches 45%; pumping after compression for production, the daily gas production is 680m 3 , the gas production is more than double that of the active water fracturing well (the same layer adjacent to the well).

[0039](1) Fracturing fluid formula: 0.6% thickener (a mixture of dimethyl octadecyl hydroxyethyl quaternary ammonium nitrate and sodium salicylate) + 1% ammonium chloride + 0.05% octylphenol ether OP- 10+98.35% water.

[0040] (2) Preparation and use method:

[0041] ①Preparation of thickener (according to the preparation of 1000 parts): add 150 parts of water and 150 parts of sodium salicyla...

Embodiment 2

[0044] The clean fracturing fluid of this example was used to perform fracturing reconstruction on the No. 3 coal seam of the Permian Shanxi Formation in Well 2701-37. The well section was 564.95-570.29m, the thickness was 5.34m, the temperature was 16°C, and the fracturing displacement was 4.5m 3 / min, add sand 60m 3 , the average sand ratio is 25.6%, and the highest sand ratio reaches 45%; pumping after compression for production, the daily gas production is 650m 3 , the gas production is more than double that of the active water fracturing well (the same layer adjacent to the well).

[0045] (1) Fracturing fluid formula: 0.8% thickener (a mixture of dimethyl octadecyl hydroxyethyl quaternary ammonium nitrate and sodium salicylate) + 1% ammonium chloride + 0.05% octylphenol ether OP- 10+98.1% water.

[0046] (2) Preparation and use method:

[0047] ①Preparation of thickener (take the preparation of 1000 parts as an example): add 150 parts of water and 150 parts of sodium ...

Embodiment 3

[0050] The clean fracturing fluid of this example was used to perform fracturing reconstruction on the No. 3 coal seam of the Permian Shanxi Formation in Well 2701-33. The well section was 559.14-564.47m, the thickness was 5.33m, the temperature was 16°C, and the fracturing displacement was 4.5m 3 / min, add sand 60m 3 , the average sand ratio is 26.3%, and the highest sand ratio reaches 45%; pumping after compression for production, the daily gas production is 660m 3 , the gas production is more than double that of the active water fracturing well (the same layer adjacent to the well).

[0051] (1) Fracturing fluid formula: 0.8% thickener (a mixture of dimethyl octadecyl hydroxyethyl quaternary ammonium nitrate and sodium salicylate) + 1% ammonium chloride + 0.1% octylphenol ether OP- 10+98.1% water.

[0052] (2) Preparation and use method:

[0053] ①Preparation of thickener (take the preparation of 1000 parts as an example): add 150 parts of water and 150 parts of sodium s...

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Abstract

The invention provides a clean fracturing fluid for coal bed fracturing, the clean fracturing fluid comprises the following components by weight: 0.6%- 1% of a thickening agent; 0.5% ~ 1% of ammonium chloride; 0.05% ~ 0.1% of octylphenol ether OP-10; and balance of water; and the thickening agent is a mixture of dimethyl octadecyl hydroxyethyl quaternary ammonium nitrate and sodium salicylate. Through full considering of the fracturing fluid rheological performance, reservoir compatibility performance and low temperature gel breaking performance, clean fracturing fluid series formulas suitable for coal beds at the temperature of 10 to 50 DEG C are formed, and the clean fracturing fluid has the advantages of low frictional resistance, good shear resistant performance, good gel breaking performance, good clay anti swelling stability effect with the anti swelling rate of more than 90%, low formation damage and the like.

Description

technical field [0001] The invention belongs to the field of mining compositions, in particular to a composition for forming cracks and its application. Background technique [0002] Active water fracturing is used in coalbed methane reservoirs. Due to the poor fracture-making and sand-carrying performance of active water, the displacement required during construction is large, which not only easily causes the fracture height to be out of control, but also has a low sand-to-liquid ratio, resulting in poor fracturing effect; Fracturing with polymer jelly fracturing fluid will cause great damage to the formation and supporting fractures due to the residue and incomplete gel breaking. Although some coal seams have been fractured with clean fracturing fluid, due to the poor gel breaking performance of the clean fracturing fluid in the coal seam, it was found that the flowback fluid did not break the gel during the pumping and drainage process after fracturing, which affected the...

Claims

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Application Information

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IPC IPC(8): C09K8/68E21B43/26
CPCC09K8/68E21B43/26
Inventor 郑西平崔艳昭万月红郑建锋潘国太普纪鹏
Owner BEIJING JIUZUN ENERGY TECH
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