Chemical flooding multi-medium central channel type injection allocation device

Abstract

The invention relates to a chemical flooding multi-medium central channel type injection allocation device. One end of an upper joint is connected with an oil pipe, and the other end of the upper joint is connected with one end of an outer sleeve; the other end of the outer sleeve is connected with the external thread end of a lower joint main body, one end of the lower joint main body is in internal threaded connection with one end, which is inserted into a sealing short section, of a lower joint; the other end of the lower joint main body is in external threaded connection with one end of a lower joint adapter, and the other end of the lower joint main body is in internal threaded connection with one end of a double-male short section of the lower joint; the other end of the lower joint adapter is connected with an oil pipe; an adjusting sleeve and a throttling inner sleeve which are connected with each other are arranged in sequence in the outer sleeve from the end close to the upper joint to the other end; a throttling corrugated pipe sleeves the outer wall of the throttling inner sleeve, a throttling outer sleeve sleeves the outer sleeve, and the outer wall of the throttling outer sleeve is tightly attached to the inner wall of the outer sleeve; and the end, which deviates from the upper joint, of the throttling inner sleeve is in threaded connection with a corrugated pipe locking joint. Online testing of single-layer injection amount, pressure and temperature and online adjustment of single-layer flow can be realized, and the requirement for multi-medium multi-layer-section injection of a chemical flooding injection well is met.

Description

technical field [0001] The invention belongs to the technical field of offshore oil field chemical flooding, in particular to a chemical flooding multi-media central channel type injector. Background technique [0002] As oilfield development enters the stage of high water cut, chemical flooding development has gradually become an important means to enhance the recovery of offshore high water cut oil fields. For injection wells, there is a situation where an injection well needs to inject two different media into stratified sections. Existing chemical flooding multi-media layered injection technologies mainly include parallel double-pipe separate injection technology and concentric multi-pipe separate injection technology. However, it can only achieve layered injection of two intervals at most, and is limited by well deviation and wellbore size, and its application range is small; the concentric multi-pipe split injection process is to establish two or three However, due t...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a chemical flooding multi-media central channel type injector to solve the technical problems of the prior art such as the small number of injection layers, the injection string does not have a test channel, and the injection profile test cannot be performed. Production under pressure

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