Method for deep treatment of oil layer through self-generation foam acidification

Abstract

The invention belongs to the technical field of deep treatment of an oil layer, and particularly relates to a method for deep treatment of an oil layer through self-generation foam acidification. The method comprises the following step of injecting a sodium nitrite solution, a sealing liquid and an ammonium chloride solution into an oil well mineshaft in sequence after an oil well is subjected to a self-generation foam acidification treatment of self-generation hydrofluoric acid solution. According to the method disclosed by the invention, residual reacted acid which is regularly acidified is utilized for reacting with the sodium nitrite solution and the ammonium chloride solution to generate foams in a short time. Bu utilizing the characteristics of high viscosity and strong carrying capability of the foams, the flow-back capability of the reacted acid is increased, particles and secondary precipitation generated by acidification are taken out of the mineshaft, and heat can be simultaneously generated to remove organic block in stratum and increase the measure effect. Meanwhile, the use of dedicated equipment is omitted.

Description

technical field [0001] The invention belongs to the technical field of advanced treatment of oil layers, in particular to a method for advanced treatment of self-generating foam acidified oil layers. Background technique [0002] Self-generating foam acidizing oil layer advanced treatment technology is an oil layer treatment technology that can relieve clogging of various oil layers, replenish formation energy, and improve flowback effect. It is a technology used to solve the problem of low-pressure oil layer plugging. [0003] Due to the fast reaction speed, the conventional acidizing oil layer treatment technology not only has a small treatment radius, but also destroys the formation framework and causes the oil layer to collapse. The advanced oil layer treatment technology can effectively solve the above problems. However, in low-pressure reservoirs, due to low formation energy, pickling products cannot be removed in time, and secondary precipitation pollution is easy to...

AI Technical Summary

Problems solved by technology

However, in low-pressure reservoirs, due to low formation energy, pickling products cannot be removed in time, and secondary precipitation pollution is easily formed

The existing foamy acid solution needs to be filled with gas, which requires the use of special equipment, and although the foam in the acid solution is relatively stable in the water medium, once it encounters crude oil, the foam disappears very quickly, thus affecting the pickling product. The timely elimination of oil wells will greatly affect the treatment measures of the oil well, and may even make the treatment measures completely ineffective.

Images