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.