Low pervasion oilfield thermochemical cleanup additive and use thereof

Abstract

The invention discloses a low permeability oil field thermochemical cleanup additive and applications thereof in acidification and fracturing technologies of low permeability oil field oil and water wells. The thermochemical cleanup additive consists of an agent A and an agent B. The agent A consists of certain parts by weight of phosphoric acid, sodium nitrite, dodecyl benzene sulphonic acid, emulsifier, surfactant and water; the agent B consists of certain parts by weight of urea, ammonium chloride and water. The agent A and the agent B thermally react under certain conditions to produce a large amount of nitrogen, carbon dioxide and high-temperature-hot-water and a large amount of heat simultaneously; in addition, the nitrogen and the carbon dioxide with certain pressure can form a large amount of bubbles under the function of a highly efficient active foaming agent for residues to be drained out of the oil and water wells. The thermochemical cleanup agent does not burn or explode easily and is mainly applied to the cleanup technology of the acidification and fracturing techniques of the low permeability oil and water wells for solving the problems such as inadequate drainage strength, reducing pollutions of remaining operating fluid to reservoir stratums and effectively enhancing the acidification and fracturing effects.

Description

technical field [0001] The invention relates to a thermochemical drainage aid used in the acidification and fracturing process of oil-water wells in low-permeability oilfields and its application. Background technique [0002] Acidizing is to inject acid liquid into the formation to dissolve the mineral components of the reservoir rock and the substances that cause the clogging of the reservoir during drilling, completion, workover and oil production, so as to improve and enhance the permeability of the reservoir, thereby increasing the production and production of oil wells. Water well injection; fracturing is to use the surface high-pressure pump group to pump high-viscosity fracturing fluid into the well with a displacement exceeding the absorption capacity of the formation to generate fractures in the formation, and add proppant (such as quartz sand, etc.) to fill the fractures to improve The conductivity of the formation, thereby improving the stimulation of oil wells a...

AI Technical Summary

Problems solved by technology

The use of this thermochemical drainage aid can fully combine the advantages of nitrogen and carbon dioxide as a drainage aid, and at the same time solve the problems of insufficient flowback and high construction costs of the two, and reduce the pollution of the remaining working fluid to the reservoir, effectively Improved acidizing and fracturing effectiveness