Adaptability of Combined Well Pattern to Sedimentary Facies Model in Thin Interbedded, Extra-Low Permeability Reservoirs

doi:10.7657/XJPG20200212

Abstract

Abstract:

The thin interbedded, extra-low permeability reservoir is characterized by small thickness and poor physical properties and the application of a combined well pattern of vertical and horizontal wells can improve single well productivity and reservoir producing degree. But due to the impacts of reservoir heterogeneity and hydraulic fractures, it is very easy for water breakthrough in horizontal wells, which will result in serious watered out and bring risks to oilfield development. Therefore, a reasonable adaptability of well pattern and fracture should be designed to elongate the production life of horizontal wells. Taking a typical thin interbedded, extra-low permeability reservoir in Daqing oilfield as an example, the paper establishes a fine reservoir numerical model for the combined well pattern of vertical and horizontal wells, which considers different sedimentary facies assemblages. The paper also studies the staged producing status of the fractured horizontal well and reveals the staged production rule and flowing characteristics in single fracture. Because the physical properties of the reservoirs of different sedimentary models are greatly different, the rise of the water cut in the fractured horizontal well doesn’t follow the rules of uniform displacement. The displacement in the channel facies with relatively good physical properties is enhanced while weakened in the sheet sands with relatively poor physical properties. Meanwhile, the hydraulic fracture will lead to the change of streamline direction and speed up the formation of high-permeable paths. In order to delay the formation of the high-permeable paths, the paper further studies the optimum configuration of typical sedimentary facies model and fracture parameters and proposes some suggestions to improve development effect.

Key words: thin interbedded reservoir, extra-low permeability reservoir, horizontal well, fracturing, combined well pattern, streamline modeling, sedimentary facies model, high-permeable path

CLC Number:

TE341

ZHANG Min, WANG Wendong, GAO Hui, SU Yuliang, ZHAN Shiyuan. Adaptability of Combined Well Pattern to Sedimentary Facies Model in Thin Interbedded, Extra-Low Permeability Reservoirs[J]. Xinjiang Petroleum Geology, 2020, 41(2): 209-216.

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