Layered Injection Unit for Chemical Flooding

Abstract

A layered injection device for chemical flooding, the lower end of the upper joint is screwed to the upper end of the upper connecting sleeve, the lower end of the upper connecting sleeve is screwed to the upper end of the main body; the guide body is placed in the upper connecting sleeve, and the lower end of the guide body is connected to the The upper end of the main body is connected, and a guide body is installed in the centering body; the lower end of the main body is threadedly connected with the lower joint; the main body is provided with a first axial offset hole and a second offset hole along the circumference. The main body is equipped with a downhole fluid reverse sealing mechanism, and a sliding valve type pressure measuring mechanism is installed in the second partial hole. The beneficial effects of the present invention are as follows: first, when the injection well is shut down or the injection is stopped, the reverse sealing mechanism works to prevent the liquid in the high-pressure layer from pouring back into the low-pressure layer through the layered injection device; Realize the pressure measurement after the reverse sealing and the seal inspection of the layered injection string. At the same time, it can solve the problem of incomplete well washing caused by the diversion of the well washing fluid on the layered injection device during backwashing. Good process inheritance and convenient on-site application.

Description

technical field [0001] The invention relates to a layered injection tool for an oil recovery process in an oil field, in particular to a layered injection device for chemical flooding. Background technique [0002] At present, the proportion of chemical flooding technology in oilfields is gradually increasing, and it is one of the important means in the process of oilfield development. At present, many oil fields adopt eccentric layered injection technology, and the existing eccentric injectors for chemical flooding do not have the function of reverse sealing. Layer backflow, and carry formation sand and dirt into the tubing, affecting the effect of layered injection. When the injection well needs to be flushed, the flushing fluid will enter the oil pipe on the eccentric injector, resulting in the midway diversion of the flushing fluid, resulting in the problem of incomplete well flushing. [0003] In addition, there is no reverse sealing pressure measuring mechanism in th...

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Problems solved by technology

[0004] The object of the present invention is to provide a layered injection device for chemical flooding, which is used in the layered injection process of chemical flooding, solves the reverse sealing problem of the eccentric injector of the layered injection well in the oil field, and simultaneously designs a slide valve type pressure measuring mechanism Solved the problem of pressure measurement after reverse sealing and the seal inspection of the layered injection string, and provided technical support for the oilfield to further improve the effect of layered injection

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