Exploitation method and device for low-pressure compact oil reservoir

Abstract

The invention provides an exploitation method and device for a low-pressure compact oil reservoir. The method comprises the following steps: arranging a horizontal well row according to a distributionsituation of geological pressure of an area where an oil reservoir to be exploited is located, wherein the horizontal well row comprises a huff and puff well and an oil exploitation well, and the huff and puff well and the oil exploitation well are arranged in a spacing manner; performing volume fracturing reservoir reconstruction on the huff and puff well and the oil exploitation well; and performing water injection and seepage oil exploitation by using the huff and puff well, and displacing the oil exploitation well adjacent to the huff and puff well by using a displacement effect between the wells so as to realize displacement oil exploitation. By use of the embodiments in the invention, the advantages of a seepage oil exploitation technology are exerted; meanwhile, exploitation of low-seepage or ultralow-seepage oil reservoirs is accelerated to the maximum extent by using the displacement between the wells, and the overall exploitation degree and the recovery rate of the low-pressure compact oil reservoir are increased.

Description

Technical field [0001] This application belongs to the technical field of oil and gas exploitation, and in particular relates to a method and device for exploitation of low-pressure tight oil reservoirs. Background technique [0002] Low-pressure tight oil reservoirs are rich in resources and widely distributed, and almost all oil-producing countries have such oil fields. my country's ultra-low pressure tight oil reservoirs are highly heterogeneous, accompanied by the development of natural fractures and low formation pressure coefficients, leading to rapid decline in the development of horizontal wells, low cumulative production, and difficulty in effective development at low oil prices. Therefore, it is urgent to find methods that can effectively develop low-pressure tight reservoirs. [0003] Horizontal well volume fracturing reservoir reconstruction methods can be used to develop low-pressure tight oil reservoirs. In the prior art, horizontal well volumetric fracturing reserv...

AI Technical Summary

Problems solved by technology

In the prior art, the volumetric fracturing of horizontal wells is used for oil production, usually only for the implementation of a single well development plan, and for a single well, only a single development method that considers water injection huff-puff imbibition or displacement

This method will lead to problems such as rapid reduction of formation energy, rapid production decline, low ultimate recovery rate, and small scope of application.

Moreover, the development method for a single well does not consider the long-term recovery effect of the entire reservoir, and cannot form an overall development plan suitable for ultra-low permeability tight oil reservoirs, and cannot improve the overall recovery of ultra-low permeability tight oil reservoirs

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