A carbon dioxide foam fracturing fluid resistant to 110°C high temperature and its preparation method

Abstract

The invention belongs to oil field chemistry and fracturing stimulation, and discloses novel carbon dioxide foam fracturing fluid resistant to high temperature of 110 degrees. The novel carbon dioxidefoam fracturing fluid resistant to high temperature of 110 degrees comprises a liquid and foam; the volume percentage of the liquid in the fracturing fluid is 20 to 55%; under 50 to 70 MPa and 50 to110 degrees, the volume percentage of the foam in the fracturing fluid is 45 to 80%; gas in the foam is carbon dioxide; the fracturing fluid is mainly prepared from the following raw materials in percentage by weight: 0.20-0.45% of a thickening agent, 0.01-0.04% of a foaming agent, 0.3-0.8% of a cross-linking agent, and the balance of water. The invention further discloses a preparation method ofthe carbon dioxide foam fracturing fluid resistant to high temperature of 110 degrees. With the adoption of the novel carbon dioxide foam fracturing fluid resistant to high temperature of 110 degrees,the residue content after oil or gas extraction is extremely low, and surface tension is small; the carbon dioxide foam fracturing fluid can be used under higher temperature conditions, combines theadvantages of a conventional cleaning foam fracturing fluid system and a conventional water-based foam fracturing fluid system, is low in cost, and has a wide application range.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry and fracturing stimulation, and in particular relates to a carbon dioxide foam fracturing fluid resistant to high temperatures of 110°C and a preparation method thereof. Background technique [0002] At present, there are many kinds of carbon dioxide foam fracturing fluids, and the most similar to the patent of the present invention is "high temperature resistant and clean CO2 suitable for unconventional oil and gas reservoir development 2 Foam fracturing fluid" (Chinese invention patent application publication number CN105567213A) and "a clean carbon dioxide foam fracturing fluid and its preparation method" (Chinese invention patent application publication number CN104531129A); High temperature clean CO 2 The foam fracturing fluid system described in "Foam Fracturing Fluid" has a narrow application range and is not suitable for conventional oil and gas reservoir development. The amoun...

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Problems solved by technology

[0002] At present, there are many kinds of carbon dioxide foam fracturing fluids, and the most similar to the patent of the present invention is "high temperature resistant and clean CO2 suitable for unconventional oil and gas reservoir development 2 Foam fracturing fluid" (Chinese invention patent application publication number CN105567213A) and "a clean carbon dioxide foam fracturing fluid and its preparation method" (Chinese invention patent application publication number CN104531129A); High temperature clean CO 2 The foam fracturing fluid system described in "Foam Fracturing Fluid" has a narrow application range and is not suitable for conventional oil and gas reservoir development. The amount of thickener in the liquid phase is large (0.3%-0.65%), and the raw material anion of the synthetic thickener Surfactants sodium lauryl sulfate and sodium lauryl sulfonate are used in a large amount, and the cost is high, resulting in high final cost of the patented product; described in "a clean carbon dioxide foam fracturing fluid and its preparation method" The foam fracturing fluid system has poor effect under high temperature conditions, high surface tension (24.29-25.48mN / m) after gel breaking, high residue content after gel breaking, and great damage to formation permeability

This type of foam fracturing fluid system is harmful to the development of unconventional oil and gas reservoirs, and the cost is high, which is not conducive to mass promotion and use

In order to overcome the shortcomings of the existing carbon dioxide foam fracturing fluid system, such as high surface tension after gel breaking, long gel breaking time, large amount of thickener, high cost and poor use effect at high temperature, it is urgent to develop a new type of high temperature resistant carbon dioxide foam fracturing liquid

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