Oil extraction method for establishing oil permeable water stop sieve by filling fusheng sand in horizontal well fracture

Abstract

The invention discloses an oil extraction method for establishing an oil permeable water stop sieve by filling fusheng sand in a horizontal well fracture, and relates to a new method for petroleum exploitation. The fusheng sand with an oil permeable and water stop function is filled in a horizontal well vertical fracture in the middle of a water injection well row and an oil extraction well row to serve as a supporting agent, so that an oil permeable and water stop sieve is formed in the middle of a water injection well and an oil extraction well, and a petroleum exploitation region is partitioned into a water injection region and an oil extraction region by the oil permeable and water stop sieve. Under the action of injection water pressure, when oil and water mixture passes through the oil permeable and water stop sieve, water is intercepted at the water injection region, and crude oil is then gathered on one side of the oil extraction region of the sieve through the sieve. After all petroleum of the water injection region completely passes through the sieve to enter the oil extraction region, the water injection pressure of the water injection region is abruptly increased, so that the sieve becomes a water permeable sieve, and the permeated water continuously pushes remaining oil at the oil extraction region to enter the oil well. By using the method, most of remaining oil of an oil field can be extracted, so that the petroleum recovery ratio is close to 100 percent.

Description

technical field [0001] The invention belongs to petroleum exploitation, and in particular relates to an oil recovery method for filling Fusheng sand by pressing fractures in a horizontal well to establish an oil-permeable and water-blocking screen. Background technique [0002] With the massive consumption of oil, oil, as an important energy and chemical raw material, is increasingly in short supply. However, due to the higher and higher water content of oil reservoirs, the comprehensive water content of major oilfields such as Daqing is close to 94%. More than 50% of the oil reserves cannot be exploited, and the exploitation cost increases year by year. Fracturing technology is the main measure to increase the production of oil wells, but in the period of high water cut, fracturing can easily lead to water flooding. In order to control the increase of water cut in oilfield production fluid, through sand coating technology, ordinary sand has the ability to enhance the surfac...

AI Technical Summary

Problems solved by technology

According to the existing technology, in order to control the water content of the produced fluid, Fusheng sand is directly used as a proppant for oil well fracturing. Due to the huge pressure difference in the wellbore of the oil layer and the oil pump fixed in the wellbore during the oil production process, a large amount of water penetrates Fusheng sand is pressed into the wellbore, which greatly reduces its oil permeability and water resistance

[0005] In order to avoid the decrease of the water-blocking and oil-permeable function of Fusheng sand under high displacement pressure, it is urgent to establish a new application method of Fusheng sand to give full play to the excellent water-blocking function of Fusheng sand under low driving pressure. Make water completely impermeable to Fusheng sand

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