Predicting temperature profiles of fractured horizontal well with two-phase flow in low-permeability gas reservoir

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  • 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;
    2.Southwest Branch of Shengli Petroleum Engineering Co. Ltd.,Deyang 618000,China;
    3.Engineering Technology Research Institute of PetroChina Huabei Oilfield Company,Renqiu 062550,China

Received date: 2018-09-06

  Revised date: 2018-11-01

  Online published: 2019-04-02

Abstract

Temperature measurements by distributed temperature sensors(DTS) are gradually being used to monitor downhole conditions of a fractured horizontal well.However,there are still great technical problems to predict the temperature profiles and diagnose the water-exit locations quantitatively of a two-phase fractured horizontal well in low-permeability gas reservoir.In this study,considering several subtle heat effects,a coupled temperature prediction model has been developed to predict the temperature profiles of a fractured horizontal well with two-phase flow in low-permeability gas reservoir.Using the developed temperature model,the temperature profiles of a fractured horizontal well with 5 different inflow-water distributions have been simulated respectively.The influences of inflow-water distribution on the wellbore temperature profiles have been analyzed as well.The predicted wellbore temperature profiles indicate that,as for a single-phase fractured horizontal well,the temperature drop at the fracture locations is positively related to the fracture half-length and the temperature characteristic value of each fracture decreases in sequence from the toe to the heel.As for a fractured horizontal well with water production,both of the temperature drop and temperature characteristic value of the particular fracture with producing water presents a phenomenon of “abnormal reduction”.Based on the aforementioned “abnormal reduction” of the temperature drop and the temperature characteristic value,two effective methods have been proposed to diagnose water-exit locations of a fractured horizontal well with known/unknown fracture half-length respectively on the basis of downhole temperature measurements.

Cite this article

Luo Hong-wen, Li Hai-tao, Liu Hui-bin, Sun Tao, Lu Yu, Li Ying . Predicting temperature profiles of fractured horizontal well with two-phase flow in low-permeability gas reservoir[J]. Natural Gas Geoscience, 2019 , 30(3) : 389 -399 . DOI: 10.11764/j.issn.1672-1926.2018.11.006

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