A Trilinear Productivity Calculation Method for Staged Fractured Horizontal Wells in Shale Oil Reservoirs

Abstract

The invention discloses a three-linear productivity calculation method for staged fracturing horizontal wells in shale oil reservoirs, which includes obtaining the basic parameters of the target formation; establishing a dimensionless production solution model of a single fracture in Laplace space; and according to the basic parameters of the target formation The dimensionless production solution model of a single fracture in parameter and Laplace space, through the flow superposition principle and Stehfest numerical inversion, obtains the dimensionless production in real space; according to the definition formula of dimensionless production, the shale oil reservoir is obtained Production of staged fractured horizontal wells. The present invention fully considers the permeability change of hydraulic fractures and the unreformed area of ​​staged fracturing, and establishes a three-zone linear seepage model based on variable fracture permeability; the proposed three-linear model for staged fracturing of horizontal wells in shale oil reservoirs The productivity calculation method is comprehensive; its calculation results are closer to the actual situation in the development of oil and gas fields, and can more accurately predict the production of staged fractured horizontal wells.

Description

technical field [0001] The invention relates to a three-linear productivity calculation method for staged fracturing horizontal wells in shale oil reservoirs, and belongs to the technical field of unconventional oil and gas stimulation and transformation. Background technique [0002] The world is rich in shale oil resources. According to data from the U.S. Energy Information Administration (EIA) and Advanced Resources International (ARI), by the end of 2017, the total global shale oil geological resources were 936.835 billion tons, and the technically recoverable resources were 61.847 billion tons. China's technologically recoverable resources are 4.393 billion tons, accounting for about 6% of the world's total, ranking third in the world. At present, the development of shale oil mainly relies on horizontal well + staged fracturing technology. Through various parameters of reservoirs and fractures, the productivity of horizontal wells can be calculated, which has guiding ...

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Problems solved by technology

However, when staged fracturing is performed, the interval between stages is usually relatively large, and the hydraulic fracturing cannot affect the entire area between the two stages, and there are unreacted areas; and the sanding method of the fracturing process determines the strength of sanding at the end of the fracture. High, less proppant is placed at the tip of the fracture, and the distribution of proppant is non-uniform, so the permeability in the fracture is not constant, but varies with the position

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