Method for calculating staged fracturing productivity of compact reservoir horizontal well

Abstract

The invention relates to the technical field of oil fracturing, in particular to a method for calculating the staged fracturing productivity of a compact reservoir horizontal well. The method is characterized by including the steps of firstly, dividing a reservoir infiltration area into four parts; secondly, obtaining the equivalent hole diameter of each fracture; thirdly, obtaining the yield of each fracture during multiple fracture disturbance; fourthly, coupling the yield of each fracture with the hydraulic pressure drop flow model in a horizontal wellbore to obtain a group of bottom hole pressure, iteratively solving until the bottom hole pressure difference of the previous step and the next step is smaller than tolerance, namely convergence, and taking the determined group of yield as the fracture-control yield of each fracture and the sum of the fracture-control yield of the fractures as the total yield of the horizontal well. The method is real and reliable in calculation result and good in application effect.

Description

technical field [0001] The invention relates to the technical field of petroleum fracturing, in particular to a method for calculating the production capacity of staged fracturing of horizontal wells in tight oil reservoirs. Background technique [0002] The productivity of horizontal wells is the basis for the optimization of fracturing parameters and the evaluation of development effects of horizontal wells. At present, domestic and foreign calculations on the fracturing productivity of horizontal wells are mostly based on the Darcy seepage model in the reservoir matrix. However, mine production practice and laboratory test results show that the matrix seepage of ultra-low permeability reservoirs does not conform to the classic Darcy's law. There is a strong nonlinear seepage phenomenon. [0003] A series of studies have been carried out at home and abroad on the fracturing productivity calculation of horizontal wells. Deng Yinger et al. established a two-phase non-Darcy ...

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Problems solved by technology

[0004] The studies of the above scholars play an important role in the productivity evaluation and dynamic prediction of horizontal wells, but there are mainly the following problems: (1) most of the current productivity calculation models have relatively harsh assumptions, and the factors affecting productivity are not fully considered, and the application effect is not good. It is too ideal; (2) Regarding the parameter optimization methods of staged fracturing horizontal wells, most of them are currently based on physical simulation and numerical simulation, and there are few studies on rapid optimization of fracturing parameters using reservoir engineering methods; The research on the productivity and seepage law of fractured horizontal wells is mainly based on the premise that the seepage in the matrix conforms to the "Darcy linear seepage law". There are basically no studies considering the nonlinear seepage phenomenon in the low-permeability reservoir matrix

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