Self-heating composite foam fracturing fluid capable of being controlled in real time and on-site construction method

Abstract

The invention relates to a self-heating composite foam fracturing fluid capable of being controlled in real time and an on-site construction method. The composite foam fracturing fluid comprises the following components in percentage by weight: 87.9-92.97% of base fluid, 6-10% of catalytic fluid, 1.0-1.8% of cross-linking fluid and 0.03-0.3% of gel breaker, wherein the base fluid is prepared from a composite thickening agent, a gas heat agent, a foaming agent, an acid stabilizer and liquid preparation water; the catalytic liquid consists of acid, a scale inhibitor and water, and is used when being prepared; the cross-linking liquid comprises a surfactant and a cross-linking agent. The on-site construction method comprises the following steps: respectively preparing a base solution and a catalytic solution according to a proportion before construction, sucking the base solution by a fracturing blender truck during construction, respectively adding a crosslinking solution and a gel breaker by a liquid adding pump and a dry adding system, pumping the catalytic solution from an outlet pipeline of a sand mixing tank by charging skid-mounted equipment, mixing the components, and then adding the crosslinking solution and the gel breaker into the sand mixing tank. The composite foam fracturing fluid which is resistant to high temperature and high salt, high in sand carrying performance, low in corrosion and low in damage is formed, the viscosity of crude oil can be effectively reduced, energy can be increased, discharge can be assisted, damage can be reduced, and productivity can be improved.

Description

technical field [0001] The invention relates to the technical fields of oilfield chemistry and fracturing stimulation, in particular to a real-time controllable self-generating composite foam fracturing fluid and an on-site construction method. Background technique [0002] Conventional water-based fracturing fluids have been widely used in the fracturing development of various oil and gas reservoirs due to their low cost, easy preparation, and even online construction. Low temperature, low temperature, high viscosity of crude oil and other reasons lead to gel-breaking fluid retention, water sensitivity, water lock, and emulsification with heavy oil after fracturing, seriously affecting the effect of fracturing stimulation or even no production capacity. Therefore, a lot of work has been done on self-generating heat fracturing fluid and foam fracturing fluid at home and abroad, in order to solve the problem of fracturing stimulation for such special reservoirs. [0003] By ...

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Problems solved by technology

Chinese patents CN103265938A, CN102627960A, CN104790933A, and CN102086388A all provide a kind of self-generated heat and angry foam fracturing fluid. The thickener adopts conventional guar gum, and its high residue content causes serious damage to the residue supporting the fracture conductivity. Secondly, several Both systems use sodium nitrite and ammonium chloride to react under acidic conditions to release a large amount of gas, without providing a reasonable control method and construction method

Chinese patent CN105238382A discloses a clean self-generating heat pressurized fracturing fluid system and its preparation method. Hydrophobic polyacrylamide is used as thickener and zirconium salt compound is used as crosslinking agent, which significantly reduces the residue content, but the temperature resistance of the system is only limited. It can reach 100°C, and its heating effect is poor, and the quality of fracturing fluid foam is low

[0005] Through the analysis of patents and literature reports, the advantages of self-generating heat-generating fracturing fluids in the development of special oil and gas reservoirs are obvious, but after years of laboratory research and field practice, although common self-generating heat fracturing fluid systems at home and abroad have their own advantages , but at the same time, many problems need to be solved: such as cumbersome on-site operation, high equipment requirements, difficult control of heat generation and gas reaction, low temperature rise, high friction resistance of foam jelly, poor temperature and salt resistance of foam fracturing fluid , low foam dryness and poor foam stability, poor sand-carrying performance and high residue content, scaling and corrosion of underground equipment, etc.

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