The transient pressure behavior model of multiple horizontal wells with complex fracture networks in tight oil reservoir

Abstract

There are often multiple volume fracturing horizontal wells producing simultaneously in the tight oil reservoir. However, from the published literature, there are a large number of seepage models for a single volume fracturing horizontal well, and there are few literature on the transient pressure behavior of multiple horizontal wells. In order to simulate the actual production of multiple horizontal wells in the field, the seepage model of multiple horizontal wells was established in this paper.In this paper, transient pressure behavior model of multiple horizontal wells is composed of two parts. One is the seepage model of reservoir and the other is seepage model in the fracture network. Firstly, based on a new plane source function, by virtue of superimposing method, the seepage model of dual medium reservoir is established considering interference between fractures. Secondly, the fluid seepage model of the complex fracture network is established by using “star-triangle” transformation method. Finally, based on the continuity equation, the reservoir model and the fracture flow model are coupled to form a complete transient pressure behavior model for multiple volume fracturing horizontal wells.Using this model, we calculate the transient pressure behavior of multiple fracturing horizontal wells, and ten typical flow regimes are divided. The influences of some of the critical parameters on the transient pressure behavior were studied, including the distance between the multiple wells, storage ratio and cross flow coefficient et al.In a word, this paper provides a very useful model for reservoir engineers regarding evaluating the performance of multiple horizontal wells with complex fracture networks.