Efficient self-produced gas foam fracturing fluid and construction method thereof

Abstract

The invention provides efficient self-produced gas foam fracturing fluid and a construction method thereof. The foam fracturing fluid is composed of base fluid, gas-producing fluid and a heat-producing agent, wherein the mass ratio of the base liquid, the gas-producing liquid and the heat-producing agent is 100:(30 to 42):(5 to 9). During construction, the base liquid and the gas-producing liquidare sucked and pumped into the underground together through a sand mixing truck at the mass ratio, and the heat-producing agent is pumped into the underground along with a propping agent. According tothe efficient self-produced gas foam fracturing fluid and the construction method thereof, liquid nitrogen accompanying injection is not required, the field process is simplified, the construction cost is reduced, and the purpose of increasing formation energy, improving the reservoir fluid flow capacity and increasing production are achieved through a large amount of gas produced by a chemical reaction; a large amount of inert safety gas can be quickly produced, and toxic gas of nitrogen oxide cannot be produced, the construction risks are lowered, and meanwhile, the alkaline environment produced by reaction products is conducive to rubber forming of the fracturing fluid and corrosion protection of down-hole strings; and by producing foam, the net formation pressure is increased througha Jamin effect, fast flowback can be achieved, heat is produced by deep formation to promote rubber breaking, and damage of the fracturing fluid to reservoir is lowered.

Description

technical field [0001] The invention relates to the field of petroleum exploitation, in particular to a high-efficiency self-produced gas foam fracturing fluid and a construction method. Background technique [0002] Fracturing is one of the main means of reservoir stimulation. During the fracturing process of low-pressure and low-permeability formations, on the one hand, the flowback energy of the fracturing fluid is insufficient, causing a large amount of liquid to remain in the formation after construction, causing a certain degree of damage to the formation and affecting the effect of fracturing stimulation. On the other hand, in the process of developing this type of formation, it is hoped that the formation energy can be supplemented by injecting gas, so as to increase oil and gas production. In order to solve these two problems, the whole process of liquid nitrogen injection is usually used, but the liquid nitrogen injection brings a lot of trouble to the site constr...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the existing problems of easy generation of by-products such as nitric oxide, high toxicity, poor solubility and potential safety hazards, the present invention provides a high-efficiency self-produced gas foam fracturing fluid and a construction method. The present invention introduces efficient and safe chemical reactions, The generated gas is safe and controllable, and high-quality foam is quickly formed to produce foam fracturing fluid. While transforming the formation, it can play the dual role of energy enhancement and drainage, reducing formation blockage damage, thereby achieving the purpose of increasing production.

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