RU95108731A - Method for development of oil deposit - Google Patents

Abstract

FIELD: oil production industry. SUBSTANCE: this can be used in development of nonuniform oil deposit. According to method, deposit is developed by taking oil from rows of producing wells with pumping in working agent through rows of injection wells so as to achieve reservoir pressure equal to 80-85% of initial value. Selected are flow lines of injected working agent to be perpendicular to rows of injection wells. On flow lines, flooded producing wells are converted into injection wells. Development of deposit is continued in mode of maintaining reservoir pressure. Selected are deposit zones with reduced porosity, permeability, oil saturation, worked out reserves and flooding speed, and with increased clay content. Additional producing wells are arranged in separated zone and/or beyond separated zone at opposite side from nearest row of injection wells. Additional producing wells are perforated in roof part of productive reservoir. Oil is taken at depression not below 85% of initial reservoir pressure. Used as working agent is accompanying Devonian water with density of 1.08-1.10 g/cm3. Working agent is pumped in cyclic operating mode: 10-20 days pumping , 10-20 days stoppage, with ensured ratio of volumes of oil taking and liquid pumping for 3 months of development. EFFECT: high efficiency.

Claims (1)

The invention relates to the oil industry and may find application in the development of a heterogeneous oil reservoir. Develop a reservoir by taking oil through the rows of producing wells and pumping a working agent through the rows of injection wells, until the reservoir pressure reaches 80 - 85% of the initial one. Allocate the streamlines of the injected working agent, perpendicular to the rows of injection wells. On current lines, waterlogged production wells are transferred to injection wells. Continue to develop reservoirs in the mode of maintaining reservoir pressure. Allocate zones of deposits with reduced porosity, permeability, oil saturation, depleted reserves and watering rate and increased clay content. Additional production wells are placed in the allocated zone and / or behind the allocated zone on the opposite side from the nearest row of injection wells. Additional production wells are perforated in the roofing of the reservoir. The selection of oil is carried out with a depression of at least 85% of the initial reservoir pressure. Associated Devonian formation water with a density of 1.08 - 1.10 g / cm ^{3 is} used as a working agent. The injection of the working agent is carried out in a cyclic mode: 10 - 20 days. injection, 10 - 20 days. shutdown while ensuring compliance with the volumes of selection and injection of fluid for three months of development.