Injection-production tubular column of horizontal well

Abstract

The invention discloses an injection-production tubular column of a horizontal well. The injection-production tubular column of the horizontal well comprises a heat insulation tube which is positioned in a vertical well section, an oil pumping rod which is arranged in the heat insulation tube, a rod type pump which is communicated with the lower end of the heat insulation tube, a chamfered heat insulation tube which is used for communicating the vertical well section with a horizontal well section, as well as an injection-production valve and a steam injection packer which are arranged in the horizontal well section; wherein the injection-production valve is communicated with the chamfered heat insulation tube by virtue of an oil tube or the heat insulation tube, and is used for injecting steam into the horizontal well section; the steam injection packer is communicated with the injection-production valve by virtue of an oil tube or the heat insulation tube, and is used for separating the horizontal well section. According to the injection-production tubular column of the horizontal well disclosed by the invention, the contradiction due to a fact that the horizontal well is used unevenly in steam-injection and oil extraction stages is solved.

Description

technical field [0001] The invention relates to the technical field of heavy oil horizontal well production, in particular to a horizontal well injection-production string. Background technique [0002] In the development of heavy oil horizontal wells, with the increase of huff and puff rounds of heavy oil horizontal wells, affected by factors such as reservoir heterogeneity and horizontal well section length, the contradiction of uneven production of horizontal sections is prominent. The productivity loss of some well sections of poor horizontal wells, on the other hand, is prone to steam channeling in some well sections of well developed horizontal wells. Once steam channeling occurs, hot steam will form a channel in the hyperpermeable zone, which will not only cause energy spillage, lower steam utilization rate, but also intensify the contradiction of uneven production, which is not conducive to the improvement of horizontal well development effect and recovery degree im...

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Problems solved by technology

However, the steam injection technology mentioned above is only aimed at alleviating the contradiction of uneven production of horizontal wells during the steam injection stage. In the production stage, general pumping is still used for production, that is, general oil production is carried out for the entire horizontal well section. Due to the difference in production of horizontal well sections Larger, and there are also large differences in the degree of recovery, so the situation of uneven production still exists

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