Multi-stage oil-water separation and same-well injection-production device in horizontal well

Abstract

The invention discloses a multi-stage oil-water separation and same-well injection-production device in a horizontal shaft. The device mainly solves the problems that in the horizontal well development process, the cost of water-containing produced liquid lifting and ground sewage treatment is high, and the perforation permeability of an oil-containing area is low. The device is characterized by comprising an oil pipe, an injection-production annulus packer and a coalescer; the injection-production annulus packer is used for improving an oil pipe space so as to achieve displacement of a high-oil-content area through same-well reinjection liquid obtained after separation of a low-oil-content area, and therefore the perforation permeability of the high-oil-content area is enhanced; and meanwhile, a coalescer is additionally arranged after a conventional cyclone is improved, so that small oil drops become large oil drops. According to the device, underground multi-stage oil-water separation of the horizontal well and same-well multi-section injection-production technology and equipment are applied, underground multi-stage oil-water separation can be achieved, and the underground oil-water separation efficiency and underground crude oil recovery rate are further improved.

Description

technical field [0001] The invention relates to an innovative device used in a horizontal wellbore to realize downhole oil-water separation and to displace recovery perforations in high oil-bearing areas. Background technique [0002] In the oil industry, horizontal well mining technology is widely used, and it is a technology with great development potential and advantages. At present, in many regions and countries, horizontal wells are the main wells for oil field development, and the technology of horizontal wells in the United States and Canada is relatively advanced. In the 1960s, China carried out horizontal well mining experiments in the Sichuan and Sichuan regions. With the continuous expansion of the use of horizontal wells, the mining technology has become increasingly mature, but it has also encountered some new problems and related technical bottlenecks. For example, in recent years In the past, during the production process of horizontal wells, it is easy to pr...

AI Technical Summary

Problems solved by technology

In the 1960s, China carried out horizontal well mining experiments in the Sichuan and Shu areas. With the continuous expansion of the use of horizontal wells, the mining technology has become increasingly mature, but it has also encountered some new problems and related technical bottlenecks. For example, in recent years In the past, during the production process of horizontal wells, it is easy to produce too much water, and it is necessary to adopt appropriate downhole oil-water separation technology. Provide high enough economic value

Images