RU95100457A - Method of developing shallow deposits and separate lenses in multiple-zone oil field - Google Patents

Abstract

FIELD: oil and gas production. SUBSTANCE: invention recommends pumping in chemical reagents through well into productive bed, increasing formation pressure resulted from release of carbon dioxide formed in chemical reactions, and recovery of product through the same well. Peculiar feature of the method is that, using the vertical well, at least one curvilinear horizontal borehole is drilled across the productive bed and calculated amount of reagents are pumped in periodically delaying recovery of product until formation pressure is restored to its original value, whereupon product is recovered to economically profitable level. EFFECT: increased coverage of lens and drainage zone; reduced development time; and increased coefficient of oil recovery. 2 dwg

Claims (1)

The invention relates to methods for developing oil fields containing industrial oil reserves, and can be used in the oil industry in the development of small deposits and individual lenses of a multilayer oil field. The method involves the injection of chemicals through the well into the reservoir, increasing the reservoir pressure due to the release of carbon dioxide as a result of the reaction, and selecting products through the same well. A feature of the proposed method is that at least one horizontal wellbore having a curvilinear arrangement in the plan is drilled through a vertical well through a vertical well, and the calculated volume of reagents is injected with periods with holding to stabilize the pressure without taking products between them until the formation pressure rises to the initial and subsequent selection of products to an economically viable level, and these cycles are repeated. The method allows to increase the coverage of the lens (deposits) by the influence of injected reagents and the drainage zone during the selection of products, reduce development time, increase the oil recovery coefficient.