Water-base fracturing fluid with low harm to permeability of reservoir bed and diversion capability of crack

A conductivity, water-based fracturing technology, applied in the fields of production fluids, wellbore/well components, earth-moving drilling, etc., can solve the problem of reducing oil well production, low residue content, affecting reservoir permeability and fracture conductivity and other problems, to achieve the effect of reducing damage, reducing residue content, and assisting in drainage, anti-demulsification and demulsification.

Inactive Publication Date: 2005-10-26
DAQING OILFIELD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing water-based fracturing fluid affects reservoir permeability and fracture conductivity and reduces oil well production, the present invention provides a water-based fracturing fluid with low damage to core permeability and fracture conductivity. Low dosage of thickener, low residue content, good temperature resistance and shear resistance, thorough gel breaking, reduced fluid loss, and reduced damage to reservoirs and proppant fractures

Method used

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Experimental program
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specific Embodiment approach 1

[0010] Specific implementation mode 1: This implementation mode consists of a base liquid and a cross-linking liquid. A. The base liquid consists of thickener 0.25-0.40%, drainage aid 0.15-0.30%, demulsifier 0.10-0.20%, anti-swelling agent 1.0-2.0%, clay stabilizer 0.10-0.20%, plant The glue stabilizer consists of 0.1-0.15%, and water 96.65-98.3%. B. The cross-linking liquid is composed of 3.0-6.0% cross-linking agent, 0.4-1.2% gel breaker and 92.8-96.6% water by weight percentage; C. The volume ratio of base liquid and cross-linking liquid is 20-50:1.

[0011] The above-mentioned thickener uses carboxymethyl hydroxypropyl guar gum CH-050, the drainage aid uses surfactant EL-11, the demulsifier and anti-emulsifier uses RT-2031, and the anti-swelling agent uses KCl or NH 4 Cl, the clay stabilizer uses the cationic active agent TOF-2, the plant glue stabilizer uses ZW-II; the crosslinking agent uses organic borate WT-04, and the gel breaker uses K 2 S 2 o 8 or (NH 4 ) 2 S ...

specific Embodiment approach 2

[0012] Specific embodiment two: this embodiment is formulated into a solution by weight percentage of drainage aid 0.15%, demulsification and anti-emulsion agent 0.10, anti-swelling agent 1.0%, clay stabilizer 0.10, vegetable gum stabilizer 0.1%, and water 98.3%. 1500~2000r / min under high-speed stirring, add 0.25% thickener to make base liquid; make cross-linking liquid with 3.0% cross-linking agent, 0.4% gel breaker and 96.6% water according to weight percentage; mix the above-prepared base liquid with The cross-linking fluid is pumped into the fracturing tube at a volume ratio of 20-25:1 for fracturing construction.

specific Embodiment approach 3

[0013] Specific embodiment three: this embodiment is formulated into a solution by weight percentage with drainage aid 0.15%, demulsification and anti-emulsion agent 0.10, anti-swelling agent 1.0%, clay stabilizer 0.10, vegetable gum stabilizer 0.1%, and water 98.3%. 1500~2000r / min under high-speed stirring, add 0.25% of thickener to prepare base liquid; make cross-linking liquid with 3.5% of cross-linking agent, 0.4% of gel breaker and 96.1% of water according to weight percentage; mix the above-prepared base liquid with The cross-linking fluid is pumped into the fracturing tube at a volume ratio of 25-30:1 for fracturing construction.

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Abstract

The present invention relates to an improvement on oil-field water base fracture fluid formula. Said water base fracture liquid is composed of base fluid and cross-linking liquor according to a certain ratio. Said base fluid is formed from (by wt%) 0.25-0.40% of thickness agent, 0.15-0.30% of cleanup additive, 0.10-0.20% of emulsion-breaking emulsion preventer, 1.0-2.0% of antiswelling agent, 0.10-0.20% of clay stabilizing agent, 0.1-0.15% of vegetable gun stabilizing agent and 96.65-98.3% of water, and the cross-linking liquor is formed from 3.0-6.0% of cross-linking agent, 0.4-1.2% of breaking agent and 92.8-96.6% of water, and the volume ratio of base fluid and cross-linking liquor is 20-50:1. Said invention can effectively improve fracture fluid properties, and its damage to reservoir permeability and fracture conductivity can be minimum.

Description

Technical field: [0001] The invention relates to the application field of oilfield chemistry, and belongs to the improvement of oilfield water-based fracturing fluid components. Background technique: [0002] Fracturing allows oil wells to increase production. At present, the water-based fracturing fluid used is not suitable for low permeability (<100×10 -3 μm 2 ) The damage rate of core permeability is 30-85%, and the damage rate of ceramsite-filled fracture conductivity at 40MPa is 35-90%. If the permeability of the reservoir near the fracture is reduced by 2%, the production will be reduced by 10%. ~15%. At present, the modified guar gum water-based fracturing fluid is mainly used in fracturing in the peripheral oilfields of Daqing. The residue content of the 90°C water-based fracturing fluid is 450-500 mg / L. The residue content in fracturing fluid and the concentrated gel content in fractures are important factors affecting reservoir permeability and fracture cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
Inventor 肖丹凤王贤君谢朝阳洪怡春王兆跃
Owner DAQING OILFIELD CO LTD
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