Novel oilfield water injection system of positive displacement underground generating set and novel water injection system comprising same

Abstract

The invention relates to a novel oilfield water injection system of a positive displacement underground generating set. The novel oilfield water injection system comprises a main cavity and a positivedisplacement underground power generating set body, wherein a water injection channel and a power generator cavity are formed inside the main cavity, the positive displacement underground power generating set body is located in the power generator cavity, the upper end of the generator cavity communicates with the water injection channel of the main cavity through an independent channel, the positive displacement underground power generating set body is assembled in the generator cavity in a mode that a hollow inner cavity of the positive displacement underground power generating set body andthe water injection channel are coaxially arranged, therefore, the drift diameter of a channel section, corresponding to the positive displacement underground power generating set body, on the waterinjection channel is almost unchanged in the axial direction, and a liquid column flowing through the channel section is not affected by hole shrinkage caused by assembling of the positive displacement underground power generating set body.

Description

technical field [0001] The invention relates to the technical field of oilfield water injection systems, in particular to a novel volumetric downhole power generation device and a novel oilfield water injection system comprising the same. Background technique [0002] Water injection is the main development technology of domestic oilfields. Because domestic oilfields are generally multi-layered and heterogeneous, general separate injection will lead to single-layer breakthrough, so layered water injection is widely used. With the continuous application and development of automatic layered water injection technology, domestic layered water injection technology has realized layered flow control and downhole parameter monitoring. [0003] At present, the automatic layered water injection technology can be roughly divided into two categories: one is to use preset cables to supply power to the downhole intelligent water distributor, and to transmit the ground and downhole measure...

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Problems solved by technology

[0008] In view of the difficult problem in the field of providing long-term and stable power supply for the wireless layered water injection technology, the current mainstream integrated structure water injection system (such as the downhole power generation device proposed by the patent document with the publication number CN108119293B), Or the split structure water injection system (such as the water injection well throwing ball type downhole power generation device proposed by the patent document CN109681368A) has proposed the use of a power generation device composed of a turbine and a generator, and utilizes the flow of downhole liquid as a power source to realize Power generation device for underground power generation:

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