A new volumetric downhole power generation device and a new oilfield water injection system including it

Abstract

The invention relates to a novel oilfield water injection system including a volumetric downhole power generation device, which includes a main cavity and a volumetric downhole power generation device, the main cavity is provided with a water injection channel and a generator cavity, and the volumetric downhole power generation device is located In the generator cavity, the upper end of the generator cavity is connected to the water injection channel of the main cavity through an independent channel, and the volumetric downhole power generation device is assembled in such a way that the hollow inner cavity is coaxially arranged with the water injection channel In the generator cavity, the diameter of the channel section corresponding to the volumetric downhole power generation device on the water injection channel has almost no change in the axial direction and the liquid column flowing through the channel section It will not be affected by diameter reduction caused by assembling the volumetric downhole power generation device.

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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