Concentric measuring and adjusting anti-backflow water injection device

Abstract

The invention discloses a concentric measuring and adjusting anti-backflow water injection device. The concentric measuring and adjusting anti-backflow water injection device comprises an upper joint,a valve outer sleeve and a lower joint, a guiding-in pen point assembly is arranged in the valve outer sleeve, the lower end of the guiding-in pen point assembly is externally provided with a bridge-type chuck and internally provided with an adjusting mechanism, the upper end of the adjusting mechanism is connected with the guiding-in pen point assembly in an inserted mode, and the lower end of the adjusting mechanism is connected with a gear assembly in an inserted mode; axial cavities are evenly distributed in the side wall of the lower joint, the lower part of each axial cavity is providedwith an anti-backflow mechanism, each axial cavity is internally provided with a valve element sleeve, each valve element sleeve is internally provided with a gear end cover, a worm and gear mechanism, a gear seat and a water nozzle assembly, the upper ends of the worm and gear mechanisms mesh with the gear assembly, and the lower ends of the worm and gear mechanisms are connected with a water nozzle mandrel; and the side wall of the lower joint is provided with a bypass flow channel, the upper end of the bypass flow channel communicates with a circumferential open hole of the bridge-type chuck, and the lower end of the bypass flow channel communicates with the interior of the lower joint. The concentric measuring and adjusting anti-backflow water injection device has the characteristicsthat the injection amount is large, the injection amount is adjustable, and after injection is stopped, formation water is prevented from backflow; and layered water injection measuring and adjustingmulti-layer-section injection is achieved, water injection layer sections are subdivided, and the oil field water injection oil driving effect is achieved.

Description

technical field [0001] The invention relates to the technical field of downhole tools for oilfield water flooding production stimulation technology, and more specifically relates to a concentric measuring and adjusting anti-back-vomiting water injection device. Background technique [0002] In the process of oilfield exploitation, injecting water into oil layers through water injection wells is an effective method to enhance oil recovery. With the improvement of oil reservoir development level, oil recovery can be enhanced by layered water injection, and bridge-type concentric water distributors are used to simultaneously realize high-precision flow measurement and adjust water injection volume during the layered water injection process (referred to as measurement Adjustment) to meet the needs of stratified water distribution. It can be seen that it is very necessary to provide a bridge-type concentric water distributor for oilfield water injection. [0003] In recent year...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of the prior art, the present invention proposes a concentric measuring and adjusting anti-back-vomiting water injection device that can prevent the formation sand-containing liquid from entering the pipe string. There are difficulties in cylinder measurement and adjustment, and factors such as the inability to further increase the adjustment torque of test instruments cannot meet the needs of offshore water injection. Using the device of the present invention for layered water injection has the advantages of small adjustment torque, large displacement, multi-layer sections, and anti-spitting. Features, solve the current problems of water injection in offshore oilfields, so as to improve the effect of water flooding and reduce costs and increase efficiency for the development of offshore oilfields

Images