A thermal recovery well forced segmented injection-production string and its method

Abstract

The invention discloses a forced segmented injection-production pipe string and a method for a thermal recovery well. The injection-production pipe string includes a steam injection and oil production integrated pump sequentially connected to the oil pipe from top to bottom, a self-regulating uniform steam injection device, a self-regulating The oil well liquid inlet device and the steam injection pipe string plug, the self-adjusting uniform steam injection device and the self-adjusting oil well liquid inlet device are taken as a group, and the number is set in at least two groups, and the self-adjusting uniform steam injection device, self-adjusting The oil well liquid inlet device corresponds to the same section of injection-production layer at the same time, and the oil pipe is also connected with a steam injection expansion packer, which is sealed on the inner wall of the thermochemical sealing rubber plug in the casing. The number of vapor expansion packers and thermochemical sealing plugs is consistent and at least three are set, and each thermochemical sealing plug can force the injection-production layer to be segmented. It can overcome problems such as uneven production, steam channeling and high water cut caused by heterogeneity in the process of steam injection and production in horizontal wells, thereby improving the overall recovery rate and economic benefits of the oil field.

Description

technical field [0001] The invention relates to a control technology for segmental production in a pipe in the field of petroleum engineering, in particular to a forced segmental injection-production pipe string and a method for a thermal recovery well. Background technique [0002] At present, in the development process of oil and gas fields, the completion methods of thermal recovery horizontal wells are generally screen sand control completion and casing completion. It is relatively easy to realize, but it is difficult to carry out staged steam injection and staged oil recovery in the case of screen completion, which affects the ultimate recovery of oil wells and reduces the final economic benefits of single wells and oilfield development benefits. In order to improve the development effect of heavy oil and super heavy oil reservoirs, most of the heavy oil and super heavy oil wells are exploited by steam huff and puff after sand control. When the oil well needs steam inj...

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Problems solved by technology

[0008] The object of the present invention is to provide a forced segmented injection-production string and method for thermal recovery wells, which can overcome the problems of uneven production, steam channeling and high water content caused by heterogeneity in the process of steam injection and production in horizontal wells, thereby Improve the overall recovery rate and economic benefits of the oil field; the specific effect is to provide a steam injection string and process that can be implemented on the spot and can be reliably separated from the precision sand filter tube and the inside of the tube in the thermal recovery horizontal well of heavy oil. That is, according to the geological characteristics of the reservoir and the requirements of the steam injection process, the outer part of the precision sand filter tube and the inner part of the precision sand filter tube and the steam injection are divided into two or more spaces, so as to realize the targeted on-demand steam injection, The purpose of balanced oil recovery is to adjust the steam absorption profile and improve the production effect of horizontal wells

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