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Issue:ISSN 1006-5539
          CN 51-1183/TE

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    Your Position ：Home->Past Journals Catalog->2015 Vol.6

    A New Idea on Producitivity Calculation of Fractured Gas Well Based on Elliptical Flow Model
    Author of the article:Zhang Jiqiang, Li Xiaoping, Luo Cheng, Yuan Lin, Du Zhiyang
    Author's Workplace：1.NOOC Ltd. Zhanjiang Company;2.State Key Lab of Oil & Gas Geology and Exploration Engineering, Southwest Petroleum University;3.Geological Exploration and Development Research Institute, CNPC Chuanqing Drilling Engineering Co., Ltd., 4.Northeastern Sichuan Production Gas Plant, SINOPEC Southwest Oil and Gas Field Company
    Key Words：Low permeability gas reservoir; Deliverability equation; Elliptic flow; Lame coefficient; Threshold pressure gradient; Slippage effect; Stress sensitivity
    Abstract：For vertically fractured wells in low permeability gas reservoir, their flows can be divided into elliptical radial flow outside fracture area and linear flow in fracture area according to its seepage rule. Based on stable percolation theory and elliptic flow model, introduced is the Lame coefficient and pseudopressure in the elliptical coordinates. Analyzed are various factors which may affect gas well productivity and established is a new model for productivity prediction in finite conductivity of vertically fractured wells. The new model calculation results show that gas well productivity will decrease due to the threshold pressure gradient and stress sensitivity effect, the productivity will increase due to the slippage effect and also increase due to the increase of fracture conductivity and fracture length, and the gas well productivity shows a decreasing trend and the decreasing range will increase along with formation damage zone radius increase and permeability decrease. The difference between the open flow capacity calculated by the formula and the actual capacity test results is less, which shows that the derived prediction equation has certain reliability.

     


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