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Fiber-reactive aqueous fracturing fluid for compact reservoir transformation, and use method thereof

A technology for tight reservoirs and hydraulic fracturing, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of high construction friction, low fluid loss, and increased viscosity, and achieve less residue and lower friction. resistance, reducing the effect of clay swelling and migration

Active Publication Date: 2015-10-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The general fracturing fluid is mainly composed of thickener, crosslinking agent and other additives compatible with the reservoir. Since the main purpose of fracturing fluid is to transport fracturing proppant and reduce fluid loss, crosslinking agent is usually used to form Gel has better proppant-carrying ability and lower fluid loss ability, but because the viscosity of the fracturing fluid increases rapidly after cross-linking, it has a relatively large frictional resistance when flowing in the pipe string
Domestic active water fracturing mainly guarantees the formation of sand and fractures through large-scale and large-displacement injection, but the construction friction of active water fracturing is high under large displacement.

Method used

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  • Fiber-reactive aqueous fracturing fluid for compact reservoir transformation, and use method thereof
  • Fiber-reactive aqueous fracturing fluid for compact reservoir transformation, and use method thereof

Examples

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Embodiment 1

[0026] This embodiment provides a fiber-activated water fracturing fluid for tight reservoir reconstruction. In terms of weight percentage, its raw material composition includes: 0.1% of drag reducing agent, 1.2% of composite synergist, 0.3% of water-soluble fiber and water balance. Wherein, the drag reducing agent is composed of 0.05% (based on the total weight of the fiber-activated water fracturing fluid) of seaweed gum and 0.05% of locust bean gum. Based on the total weight of the composite synergist, it consists of 20% isopropanol, 20% octadecylpyridine chloride, 5% alkylphenol polyoxyethylene polymethyloxyethylene ether, alkylphenol polyoxyethylene 5% of oxyethylene ether, 15% of cetyltrimethylammonium bromide, 5% of dodecylbenzyldimethylammonium chloride, 10% of potassium chloride and the balance of water, the compound synergistic The agent is prepared by mixing the raw materials and fully stirring them evenly. The water-soluble fiber is composed of polyacrylonitrile ...

Embodiment 2

[0028] This example provides a fiber-activated water fracturing fluid for tight reservoir reconstruction. In terms of weight percentage, its raw material composition includes: drag reducing agent 0.08%, composite synergist 1.0%, water-soluble fiber 0.2% and water balance. Wherein, the drag reducing agent is konjac gum. Based on the total weight of the composite synergist, it consists of 30% ethanol, 10% cetylpyridinium chloride, 10% fatty alcohol polyoxyethylene ether, dodecylbenzyltrimethylammonium chloride 20%, octadecyltrimethylammonium bromide 5%, potassium chloride 20% and the balance of water. The composite synergist is prepared by mixing the raw materials and fully stirring them uniformly. The water-soluble fiber is polyacrylonitrile fiber; the performance parameters of the polyacrylonitrile fiber are: the tensile strength of the fiber is 159MPa, and the true density of the fiber is 0.998g / cm 3 , with a fiber length of 5 mm and a fiber diameter of 75 μm.

Embodiment 3

[0030]This example provides a fiber-activated water fracturing fluid for tight reservoir reconstruction. In terms of weight percentage, its raw material composition includes: drag reducing agent 0.05%, composite synergist 0.5%, water-soluble fiber 0.1% and water balance. Wherein, the drag reducing agent is gum arabic. Based on the total weight of the composite synergist, it consists of 30% ethanol, 10% cetylpyridinium chloride, 10% fatty alcohol polyoxyethylene ether, dodecylbenzyltrimethylammonium chloride 20%, octadecyltrimethylammonium bromide 5%, potassium chloride 20% and the balance of water. The composite synergist is prepared by mixing the raw materials and fully stirring them uniformly. The water-soluble fiber is polyethylene fiber and polyvinyl alcohol fiber; the performance parameters of the polyethylene fiber are: the tensile strength of the fiber is 75MPa, and the real density of the fiber is 0.985g / cm 3 , the fiber length is 3 mm, and the fiber diameter is 88 μ...

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Abstract

The present invention provides a fiber-reactive aqueous fracturing fluid for compact reservoir transformation, and a use method thereof, wherein the raw materials comprise, by weight, 0.05-0.1% of a friction-reducing agent, 0.5-2.0% of a composite synergist, 0.1-0.3% of water-soluble fibers, and the balance of water. The use method of the fiber-reactive aqueous fracturing fluid comprises: during the fracturing construction process, uniformly mixing the friction-reducing agent, the composite synergist, the water-soluble fibers and the water, and pumping into the stratum. According to the present invention, the fiber-reactive aqueous fracturing fluid has characteristics of no thickener, low damage, low friction, simple formula, easy preparation, strong operability and the like; and the thickener is not used and the residue is less, such that the reservoir damage can be reduced at a maximum, and the fiber-reactive aqueous fracturing fluid is especially suitable for the compact reservoir fracturing transformation.

Description

technical field [0001] The invention relates to a fiber-activated water fracturing fluid for compact reservoir reconstruction and a method for using the same, belonging to the technical field of petroleum exploitation. Background technique [0002] The general fracturing fluid is mainly composed of thickener, crosslinking agent and other additives compatible with the reservoir. Since the main purpose of fracturing fluid is to transport fracturing proppant and reduce fluid loss, crosslinking agent is usually used to form Jelly has better proppant-carrying ability and lower fluid loss ability, but because the viscosity of the fracturing fluid increases rapidly after cross-linking, it has a relatively large frictional resistance when flowing in the pipe string. Domestic active water fracturing mainly guarantees the formation of sand carrying and fractures through large-scale and large-displacement injection, but the construction friction of active water fracturing is high under...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/68C09K8/882C09K8/90C09K2208/08
Inventor 刘玉婷管保山卢拥军梁利王海燕舒玉华王丽伟翟文明华薛延萍
Owner PETROCHINA CO LTD
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