METHOD FOR ARRANGEMENT OF VERTICAL AND LATERAL FLOODING Russian patent published in 2014 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil producing industry. The concept of the invention is as follows: according to the method idle (suspended) vertical or controlled directional wells are used. The wells are re-entered and selected as producers and injectors. In the re-entered producers the lower half of the productive formation is isolated while the perforated interval in the upper half of the productive formation remains untouched; a tubing string is run in with a deep well pump and/or other equipment in compliance with the planned operating technique and the well is put into production with extraction of the product from the perforated upper half of the productive formation. In the re-entered injectors a tubing string is run in with a packer; the packer is set at the level of two thirds of thickness of the productive formation from the roof, then water is injected to the lower third of the productive formation. According to one variant, isolation of the lower half of the productive formation is made by cement plug setting or pouring of the lower bottomhole part with cement. According to another variant, isolation of the lower half of the productive formation is made with a tubing string with a packer, a sealed blind at the lower end of the tubing string and available holes, slots or another through cuts in the tubing string at the level of the upper perforated half of the productive formation. At that the packer is set at the level of the midpoint of the productive formation thickness.

EFFECT: ensuring enhanced oil recovery of oil deposits.

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