Method and device for determining total production of multilayer and multistage horizontal fracture production wells

Abstract

Embodiments of the present invention provide a method and device for determining the total output of multi-layer and multi-stage horizontal fracture oil production wells, wherein the method includes: selecting an oil production well with horizontal fractures from the oil reservoir; The pressure distribution of a single thin poor oil layer; the pressure drop caused by the four water injection wells and oil production wells in the equivalent area of ​​the horizontal fracture is selected to be superimposed to calculate the pressure at any point in the formation where the single thin poor oil layer is located; according to the single thin poor oil layer The pressure in the formation, combined with the pressure loss caused by the start-up pressure gradient, and the ratio of the total water injection volume of the four water injection wells to the oil production volume of the oil production well, calculate the horizontal fracture recovery in the five-point well pattern of each layer in the reservoir. The oil production and water production of a single layer of an oil well are superimposed on each layer to obtain the total production of multi-layer and multi-stage horizontal fracture oil production wells. The embodiment of the present invention solves the technical problem in the prior art that the productivity of vertical wells with multi-layer and multi-stage horizontal fractures cannot be accurately determined.

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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