A high-efficiency self-produced gas foam fracturing fluid and its construction method

Abstract

The present invention provides a high-efficiency self-generated gas foam fracturing fluid and a construction method. The foam fracturing fluid is composed of a base fluid, a gas-generating fluid and a heat-generating agent, wherein the mass ratio of the base fluid, gas-generating fluid, and heat-generating agent is 100: (30‑42): (5‑9). During construction, the base fluid and the gas-producing fluid are pumped downhole together through the suction of the sand mixing truck according to the mass ratio, and the heat generating agent is pumped into the downhole along with the proppant. The invention does not need liquid nitrogen accompanying injection, simplifies the on-site process and reduces the construction cost, and a large amount of gas generated through the chemical reaction achieves the purpose of increasing the energy of the formation, improving the flow capacity of the reservoir liquid, and increasing the output. It can quickly generate a large amount of inert and safe gas, and will not produce toxic gas of nitrogen oxides, reducing construction risks. At the same time, the alkaline environment generated by the reaction product is conducive to the formation of fracturing fluid gel and the corrosion protection of downhole pipe strings. By generating foam, the Jiamin effect is used to increase the net pressure of the formation, which can quickly flow back, generate heat in the deep formation to promote gel breaking, and reduce the damage of fracturing fluid to the reservoir.

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...

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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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