Multi-media separated injection system suitable for mine field complex oil reservoir

Abstract

The invention provides a multi-media separated injection system and method. A multi-media separated injection pipe column device comprises a first passageway, a second passageway, a third passageway and a fourth passageway, wherein the first passageway is provided with a first pipeline for injecting a first medium to a first-depth well section, the second passageway is provided with a second pipeline for injecting a second medium to a second-depth well section, the third passageway is provided with a third pipeline for injecting a third medium to a third-depth well section, two decenter injection proration devices connected in series are arranged at the bottom of the third pipeline, the fourth passageway is provided with a fourth pipeline which can contain the first pipeline, the second pipeline and the third pipeline, and a first single-pipe packer, a second single-pipe packer, a three-pipe packer and a double-pipe packer are contained in the fourth pipeline. The different media are injected to the well sections of different depths through the four passageways, and therefore the multiple media can be injected to the different sections at the same time, the borehole operation can be monitored in real time and adjusted instantly aboveground, the petroleum recovery efficiency is improved, and the system and method are suitable for production of a mine field complex oil reservoir.

Description

technical field [0001] The invention relates to the technical field of oilfield exploitation, in particular to an uphole control system and control method for multi-medium injection flow applicable to complex oil layers in mine fields. Background technique [0002] The oilfield development has entered the tertiary production stage; the conventional injection method can only inject medium one by one, which is time-consuming and laborious, and it will cause a lot of loss to the oil casing. After the instrument fails, it needs to be fished out and the maintenance is difficult. Conventional injection methods are difficult to monitor and cannot reflect the impact of injection volume on formations in real time; therefore, conventional medium injection methods can no longer meet the current injection requirements. [0003] In view of the shortcomings of conventional injection methods, the prior art provides two types of injection devices: one type of injection device can inject a s...

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Problems solved by technology

[0006] However, the inventors found in the process of realizing the present invention that, due to the above-mentioned split injection scheme, the range of injection is small, the types of injection are limited, the measurement and adjustment are difficult, the change of polymer viscosity cannot be measured in real time, and the pipe string equipment is washed by the injection medium. Due to the existence of problems such as equipment corrosion, the downhole separate injection device disclosed in the prior art cannot meet the collection needs of complex oil layers in the mine, which is not conducive to the improvement of recovery efficiency

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