Advantages in Formation Heat Treatment to Enhance Permeability in Tight Reservoir

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  • (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China

Received date: 2013-01-25

  Revised date: 2013-03-08

  Online published: 2013-12-10

Abstract

As the effectiveness of conventional stimulation treatment is under-expected for tight reservoir and unconventional resources are urged to exploit,based on thermal properties of rock,formation heat treatment (FHT),is developed as an innovative well stimulation technique,which is focused on the permeability of rock.Experimental evaluation methods of FHT are shown in this paper.Comprehensive analysis indicates that the essence of the physical-chemical changes for tight rock under high temperature is a set of multi-scale processes involving evaporation of water in pore,change of mineral structure and generation of fracture network.Under the action of thermal stress,the main mechanism of enhancing permeability is the fracture network developed from micro-fracture and fracture propagation.Successful field cases of FHT are presented.On the basis of multi-scale effect in tight reservoir and its production mechanism,the advantages of FHT are reflected in preventing water phase trapping,decreasing fracture pressure,forming fracture network,enhancing-desorption and diffusion of gas in pore.In view of multi-scale mass-transfer theory,a new well stimulation technique,integrated the superiority of FHT,fracturing and acidizing is expected.

Cite this article

CHEN Ming-jun,KANG Yi-li,YOU Li-jun . Advantages in Formation Heat Treatment to Enhance Permeability in Tight Reservoir[J]. Natural Gas Geoscience, 2013 , 24(6) : 1226 -1231 . DOI: 10.11764/j.issn.1672-1926.2013.06.1226

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