Analytical solution and mechanisms of fluid production from hydraulically fractured wells with finite fracture conductivity

Yan Jin, Kangping Chen, Mian Chen

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

A comprehensive study of the physical mechanisms of fluid production from a well intersected by a narrow elliptically shaped vertical fracture with finite fracture conductivity is carried out using a newly obtained analytical solution. The flow pattern, flux density distribution along the fracture surface, and fluid production rate are analyzed systematically with respect to finite fracture conductivity. The simplicity of the new analytical solution reveals many physical insights not attainable from existing analytical or numerical solutions. It is shown that the nearly singular pressure gradient developed at the fracture tip induces the reservoir flow to converge to and focus at the tip region, promoting flux density along the entire fracture surface and enhancing the production rate. It is established that the flow in the reservoir is a superposition of two basic flows, a confocal elliptical flow responsible for the fluid production, and a redistributive nonproducing flow induced by a finite fracture conductivity that draws fluids out of the fracture from the part near the tip and redeposits them back to the part of the fracture close to the wellbore. An explicit analytical formula for the fluid production rate is also derived that exhibits a simple dependency on the dimensionless fracture conductivity.

Original languageEnglish (US)
Pages (from-to)103-122
Number of pages20
JournalJournal of Engineering Mathematics
Volume92
Issue number1
DOIs
StatePublished - Jun 1 2015

Keywords

  • Finite fracture conductivity
  • Fluid production mechanism
  • Porous media flow
  • Pressure gradient singularity

ASJC Scopus subject areas

  • Mathematics(all)
  • Engineering(all)

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