Oil extraction method for water controlling and oil increasing of buried hill oil reservoir high-water-cut oil-producing well

Abstract

The invention provides an oil extraction method for water controlling and oil increasing of a buried hill oil reservoir high-water-cut oil-producing well. The method comprises the following steps that 10, the high-water-cut oil-producing well is adopted as a target gas-injection well; 20, gas is injected into the target gas-injection well till the injected gas completes stratum bottom water displacement, and gas injection is stopped; 30, then, the target gas-injection well is adopted as a production well, and oil extraction production is performed. Gas is injected into the high-water-cut oil-producing well, the gas can achieve effective stratum bottom water displacement, bottom water is restrained from coning upwards, meanwhile, the injected gas can also enter an oil reservoir matrix, crude oil in the matrix and crude oil in tiny cracks are effectively displaced, water seal of the crude oil is relieved, the reservoir stratum working degree is improved, and therefore the water controlling and oil increasing effects are achieved.

Description

technical field [0001] The invention relates to an oil recovery method, in particular to an oil recovery method for controlling water and increasing oil of high water-cut oil wells in buried hill oil reservoirs. Background technique [0002] Most buried hill reservoirs have a dual-media structure, which refers to reservoirs with both fractures and pores in rocks. The particularity of the dual medium is that after the crude oil in the fracture is produced, it depends on the matrix to provide crude oil to the fracture, and then flows from the fracture to the bottom of the well. Since the permeability of the fracture is much greater than that of the matrix, when the main fracture communicates with the bottom water, the phenomenon of water channeling is serious, the bottom water in the formation rapidly coning upwards, the water content of the oil well rises rapidly, and is quickly submerged, and the crude oil in the matrix and micro-fractures If it is sealed by water, it canno...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method of oil production for oil wells with high water cut in buried hill reservoirs to control water and increase oil production, so as to solve the problem that oil wells cannot be produced normally due to water flooding caused by bottom water coning

Images