Self-gas-generating foam fracturing fluid, its production method and application method

A foam fracturing fluid and self-generating technology, applied in the field of fracturing fluid, can solve problems such as damage to reservoirs, increase fracturing costs, and low formation pressure, so as to avoid safety problems, reduce construction costs, and simplify construction procedures Effect

Active Publication Date: 2012-08-08
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]At present, in the fracturing process of low-pressure and low-permeability water-sensitive oil and gas reservoirs, the most commonly used hydroxypropyl guaridine-borax/organic boron fracturing fluid system exists The main problems: one is the damage caused by the fracturing fluid filtrate to low-pressure and low-permeability oil and gas reservoirs; the other is that the fracturing fluid is cross-linked under alkaline conditions, causing alkali-sensitive damage to the alkali-sensitive reservoir,
In addition, after the hi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1, the self-generating foam fracturing fluid is composed of a base fluid and a reaction fluid, and the volume ratio of the base fluid to the reaction fluid is 100:8 to 12; wherein, the base fluid is composed of: hydrolyzed polyacrylamide 2 5 parts to 5 parts, 50 to 150 parts of sodium nitrite, 40 to 130 parts of ammonium chloride, 5 to 15 parts of foaming agent, 2 to 6 parts of clay stabilizer, 0.5 to 2 parts of fungicide, water 700 to 900 parts; the reaction liquid consists of 5 to 15 parts of aluminum trichloride, 3 to 15 parts of hydrochloric acid, and 700 to 800 parts of water in parts by weight.

Embodiment 2

[0020] Example 2, the self-generating foam fracturing fluid is composed of a base fluid and a reaction fluid, and the volume ratio of the base fluid to the reaction fluid is 100:8; wherein, the base fluid consists of 2 parts by weight of hydrolyzed polyacrylamide, 50 parts of sodium nitrite, 40 parts of ammonium chloride, 5 parts of foaming agent, 2 parts of clay stabilizer, 0.5 part of bactericide, 700 parts of water; the reaction solution consists of 5 parts of aluminum trichloride, hydrochloric acid 3 parts, 700 parts of water.

Embodiment 3

[0021] Example 3, the self-generating foam fracturing fluid is composed of a base fluid and a reaction fluid, and the volume ratio of the base fluid to the reaction fluid is 100:12; wherein, the base fluid consists of 5 parts by weight of hydrolyzed polyacrylamide, 150 parts of sodium nitrite, 130 parts of ammonium chloride, 15 parts of foaming agent, 6 parts of clay stabilizer, 2 parts of bactericide, 900 parts of water; the reaction solution consists of 15 parts of aluminum trichloride, hydrochloric acid 15 parts, 800 parts of water.

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PUM

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Abstract

Relating to the technical field of fracturing fluids used for petroleum exploitation, the invention discloses a self-gas-generating foam fracturing fluid, its production method and application method. The elf-gas-generating foam fracturing fluid is composed of a base solution and a reaction solution. The base solution consists of: hydrolyzed polyacrylamide, sodium nitrite, ammonium chloride, a foaming agent, a clay stabilizing agent, a bactericide and water. The reaction solution comprises, by weight part: aluminium trichloride, hydrochloric acid and water. The foam fracturing fluid has the advantages that: it releases a lot of inert gas during reaction, increases pressure of the reservoir stratum, has good discharge aiding ability and simultaneously forms a foam structure, substantially reduces filter loss property, and reduces the harm of the fracturing fluid on the reservoir stratum; it can be crosslinked under a weak acid condition (pH=4.0-6.0), thus avoiding alkali sensitivity and reducing the harm to the reservoir stratum. Compared with the technology of injection along with liquid nitrogen, the application method of the invention reduces construction cost, simplifies construction procedure, and avoids safety problems caused by liquid nitrogen storage.

Description

technical field [0001] The invention relates to the technical field of fracturing fluid used in petroleum exploitation, and relates to a self-generating foam fracturing fluid and its production method and application method. Background technique [0002] Hydraulic fracturing is one of the most important production stimulation measures for oil and gas well stimulation, water well injection, and oil and gas well productivity and recovery. Fracturing fluid is the working fluid in the process of hydraulic fracturing to stimulate oil and gas layers. It plays the role of transmitting pressure, forming formation fractures, and carrying proppant into fractures. The performance of fracturing fluid is an important factor related to the success or failure of fracturing construction and the effect of stimulation after fracturing. [0003] At present, in the fracturing process of low-pressure, low-permeability and water-sensitive oil and gas reservoirs, the most commonly used hydroxypro...

Claims

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Application Information

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IPC IPC(8): C09K8/70
Inventor 陈效领丁士辉李家平刘勇赵丽萍
Owner BC P INC CHINA NAT PETROLEUM CORP
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