METHOD FOR DEVELOPMENT OF MULTILAYER OIL DEPOSITS Russian patent published in 2021 - IPC E21B43/14 E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry and can be used in the development by water displacement of multilayer oil and gas deposits. The method includes opening by injection wells of a productive formation and underlying aquifers with subsequent construction and secondary opening of layers, opening of a productive formation with production wells with subsequent construction and secondary opening of a productive formation, flooding of a productive formation with downhole crossflow in injection wells from aquifers, into oil-bearing products from a productive formation through production wells. Pressure compensation by waterflooding in the productive formation is carried out at the expense of nearby injection wells that are not connected to the lower aquifer. Re-opening of a productive formation from injection wells is carried out in the lower part of no higher than 1/3 of the formation thickness and/or no higher than the level of water-oil contact to ensure the displacement of products and production from this formation by production wells with the most profitable period of work on water cut. Before putting into operation inside the well water flow, injection wells are checked for the effectiveness of the impact on the productive formation, considering the volume of water flowing in the natural mode into the productive formation from aquifers. According to the results, the allocation of highly efficient injection wells, which, in relation to low-efficiency wells, bypass two or more times more water into the productive formation and which are put into operation for in-situ crossflow.

EFFECT: increasing efficiency of oil displacement by water from the reservoir.

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