Downhole power generation device for water injection well

Abstract

The invention discloses a downhole power generation device for a water injection well. The downhole power generation device comprises a power generator body arranged on a water outlet of a branch channel on one side of underground downhole water injection main channel; the power generator body comprises a flow guide disc, a turbine, an outer rotor assembly, an inner stator assembly and a power generation circuit assembly; a plurality of flow guide through holes are formed in the flow guide disc; the turbine is rotationally connected with the inner stator assembly; one end of the outer rotor assembly is fixedly connected with the turbine; the power generation circuit assembly is fixedly connected with the inner stator assembly; and a blanking plug is arranged below the water injection main channel close to a water inlet of the branch channel. The power generator body does not occupy the water injection main channel, and normal water injection is not affected. According to the power generator body, the kinetic energy of fluid beams acting on blades can be increased through the flow guide disc, so that the energy of water flow is fully utilized, and the power generation efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of downhole layered water injection equipment for water injection wells in oil fields, and in particular relates to an underhole power generation device for water injection wells. Background technique [0002] At each stage of oilfield development, water can be injected from the wellhead into the reservoir through the water injection well, so that each oil layer has a strong driving force to increase the recovery rate and production speed. The traditional water injection method cannot solve the contradiction between layers, and the water absorption capacity of each oil reservoir is different, so layered water injection is adopted by more and more oil fields. Most of the existing power supply schemes for water injection layered measurement and adjustment use cable power supply. The disadvantage is that the high temperature and high pressure environment in the well makes the cable prone to failure. Another pow...

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Problems solved by technology

The traditional water injection method cannot solve the contradiction between layers, and at the same time, the water absorption capacity of each reservoir is different, so layered water injection is adopted by more and more oil fields

Most of the existing power supply schemes for water injection layered measurement and adjustment use cable power supply. The disadvantage is that the high temperature and high pressure environment in the well makes the cable prone to failure. Another power supply method is battery power supply, but because the battery is disposable, it needs to be regularly Replacement, which increases the cost and is not environmentally friendly, therefore, the use of turbine generators to generate electricity can solve the above problems

[0003] In the prior art, the existing downhole turbine generator is mainly used for large flow power generation, which is generally suitable for drilling and uses a large amount of mud discharged during drilling operations as a power source. This type of generator generally does not have strict volume restrictions, so the power generation Generally larger

However, due to the narrow underground space of the water injection well, the power generation device is large in size and cannot occupy the main water injection channel, otherwise it will affect the normal water injection. Moreover, the water injection volume of the water injection well is limited, and the fluid kinetic energy is small, so the power generation efficiency of driving the large flow power generation device extremely low

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