Method and device for determining total yield of multi-layer multi-section horizontal fractured producing well

Abstract

An embodiment of the invention provides a method and a device for determining total yield of a multi-layer multi-section horizontal fractured producing well. The method comprises the following steps: a producing well provided with horizontal fractures is selected from an oil reservoir; pressure distribution of the producing well in single thin and poor reservoir of the oil reservoir is calculated; pressure drops, triggered in horizontal fractured equivalence areas, of four water injection wells and the producing well are superposed, so that the pressure of any point in a formation where the single thin and poor reservoir is located is calculated; the oil yield and water yield of single layer of the horizontal fractured producing well in a five-spot well pattern of each layer of the oil reservoir are calculated according to the pressure of the formation where the single thin and poor reservoir is located and in combination with pressure loss caused by start of pressure gradient and the ratio of the total water injection quantity of the four water injection wells to the oil yield of the producing well, the oil yields and the water yields of layers are superposed, and the total yield of the multi-layer multi-section horizontal fractured producing well is obtained. According to the embodiment of the invention, the technical problem that the productivity of the multi-layer multi-section horizontal fractured straight well cannot be determined accurately in the prior art is solved.

Description

technical field [0001] The invention relates to the technical field of petroleum exploration, in particular to a method and a device for determining the total output of multilayer and multistage horizontal fracture oil production wells. Background technique [0002] Thin and poor oil layers (for example: Daqing Lasaxing Oilfield, Shengli Shengtuo Oilfield, Yumen Laojunmiao Oilfield, etc.) have become the main potential of multi-layer heterogeneous reservoirs in the ultra-high water cut period. When vertical wells are used to develop non-main oil layers with poor physical properties, the fractures formed after hydraulic fracturing mainly include: horizontal fractures perpendicular to the wellbore and vertical fractures parallel to the wellbore, especially in the thin gap where the buried depth is shallow and the fracture pressure gradient of the oil layer is small. Oil layers are prone to form horizontal fractures during hydraulic fracturing. The vertical well with multi-lay...

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Problems solved by technology

[0004] For how to determine the productivity of vertical wells with multi-layer and multi-stage horizontal fractures, no effective solution has been proposed so far

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