Lithologic Reservoirs ›› 2018, Vol. 30 ›› Issue (5): 161-168.doi: 10.12108/yxyqc.20180520

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Calculation method for productivity of fractured horizontal well in tight gas reservoir

WANG Xinjie   

  1. Research Institute of Exploration and Development, Sinopec North China Oil & Gas Company, Zhengzhou 450000, China
  • Received:2017-09-22 Revised:2018-02-27 Online:2018-09-14 Published:2018-09-14

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Abstract: In order to accurately evaluate the productivity of fractured horizontal wells in tight gas reservoirs and determine the rational distribution of gas wells, and to achieve efficient development of gas wells, based on the theory of conformal transformation and gas water two-phase seepage theory,the effective permeability of the matrix was used as a variable to consider the effects of fracturing and gas well production on the effective permeability of the reservoir,and gas liquid two phase productivity equation of fracturing horizontal well was established and verified by actual production data. The reliability of the deliverability calculation results was verified. The results show that when the dimensionless discharge boundary is greater than 0.55,the production pressure drop of the gas well increases rapidly with the increase of production,and the higher the water-gas ratio is,the greater the pressure drop for the gas well is needed under the same gas well productivity. When the horizontal direction is parallel to the Ky direction,the greater the permeability anisotropy Ky/Kx is,the smaller the production pressure drop is needed in the same gas production. When the angle between the horizontal section and the main permeability direction is less than 30°,the production pressure drop of the gas well under the same gas production condition is almost unchanged.Therefore,from the view of reducing the pressure loss of reservoir pressure in fractured horizontal wells,the influences of permeability anisotropy and the direction of horizontal well horizontal section should be fully consi-dered,and the control of gas well production and necessary water control and drainage measures should be taken into consideration in order to achieve better development effect.

Key words: fractured horizontal well, gas water two-phase seepage, conformal transformation, permeability anisotropy

CLC Number: 

  • TE37
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