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

A self-generated foam and advanced treatment technology, which is applied in the field of advanced treatment of oil layers, can solve the problems of inability to remove pickling products in time, affecting the timely removal of pickling products, influence of oil well treatment measures, etc., so as to improve the effect of measures and save the use of special equipment , the effect of high viscosity

Active Publication Date: 2015-01-21
PETROCHINA CO LTD
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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.

Method used

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

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Embodiment Construction

[0010] Usually, after long-term consumptive exploitation in oilfields, the formation pressure has dropped significantly, and the pressure in some major blocks has dropped below 2MPa. The common chemical plugging removal method has poor plugging effect, high cost and short validity period. The deep treatment method of the self-generating foam acidizing oil layer of the present invention can effectively solve this production problem. After the self-generating foam acidizing treatment, the self-generating system is added, which can not only achieve deep acidizing of the oil layer and supplement the energy of the formation, but also improve the recovery effect and save Nitrogen injection and nitrogen production equipment, easy construction.

[0011] The self-generating foam acidizing oil layer advanced treatment method is a technology to clean the pores of the oil layer with organic solvents and surfactants. Specifically, under the conditions of formation temperature and a certain ...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B37/06E21B36/00C09K8/52
Inventor 梅玉芬马春宝向延安徐恩宽韩松姜佳悦刘广友胡贺元王振军蔡德军
Owner PETROCHINA CO LTD
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