A new method of predicting productivity of multi-stagefractured horizontal well in tight gas reservoir

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  • Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China

Received date: 2015-07-16

  Revised date: 2015-12-21

  Online published: 2019-09-19

Abstract

The general completion technique for horizontal wells in tight gas is by multi-stages hydraulically fracturing,and the flow characteristics in horizontal well with multiple transverse fractures are very complicated.Conventional methods,taking well as an evaluation unit,are difficult to accurately predict production capacity of each fracture and productivity differences between wells with different number of fractures.So single fracture is as the minimum evaluation unit,matrix,fractures and lateral wellbore model are combined integrally to approximate horizontal well with multiple transverse hydraulic fractures in tight gas.This paper presents a new semi-analytical methodology for predicting the production capacity of horizontal well with multiple transverse hydraulic fractures in tight gas reservoirs.Firstly,mathematical flow model in matrix,which is disturbed by finite-conductivity vertical fractures and rectangular shaped boundaries,is established and solved by Fourier integral transform.Then the idea of single stage fracture analysis is incorporated to establish linear flow model within single fracture with variable rate.Fredholm integral numerical solution is applicable for the fracture conductivity function.Finally,pipe flow model along lateral wellbore is employed to couple multi-stages fracture mathematical models,and the equation group of predicting productivity of multi-stage fractured horizontal well,considering the whole process flow from matrix to bottom hole and production interference between adjacent fractures,is established.Meanwhile,corresponding iterative algorithm of the equations is given.In this case analysis,the productions of actual well and every fracture are calculated under the different bottom hole flowing pressure,and this method also contributes to obtain the distribution of pressure drop and production for every horizontal segment and its changes with effective fracture half-length and conductivity.Application of this technology will provide gas reservoir engineers with a better tool for predicting well and every fracture productivity,and optimizing transverse hydraulic fractures configuration and conductivity along lateral wellbore.

Cite this article

Wei Yun-sheng, Jia Ai-lin, He Dong-bo, Wang Jun-lei . A new method of predicting productivity of multi-stagefractured horizontal well in tight gas reservoir[J]. Natural Gas Geoscience, 2016 , 27(6) : 1101 -1109 . DOI: 10.11764/j.issn.1672-1926.2016.06.1101

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