Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (1): 147-152.doi: 10.12108/yxyqc.20190117

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Prediction of water breakthrough time for horizontal well in non-Darcy flow edge water gas reservoirs

HUANG Quanhua1, LIN Xingyu1, TONG Kai2, LU Yun1, FU Yunhui1   

  1. 1. College of Petroleum Engineering, Southwest Petroleum University, Chengdu 610500, China;
    2. No.1 Oil Production Plant, Northwest Oilfield Company, Sinopec, Luntai 841600, Xinjiang, China
  • Received:2018-09-21 Revised:2018-11-29 Online:2019-01-18 Published:2019-01-18

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Abstract: Reasonable prediction of water breakthrough time of horizontal wells in edge water gas reservoirs is beneficial to rational development of gas reservoirs and evaluation of gas reservoirs. In current prediction models, gas seepage in formation is generally assumed to be Darcy flow,but for high-yield horizontal wells,the non-Darcy effect of fluid seepage in formation on water breakthrough time cannot be ignored. In order to study water breakthrough time more coincident with actual production,based on particle seepage law of porous media fluid,an ellipsoidal horizontal well seepage model was adopted to comprehensively consider the effects of non-Darcy flow effect of gas seepage in high-yield horizontal wells,the distance between horizontal well and initial gas-water interface,the length of horizontal section and the production of gas wells on water breakthrough time,and a formula for predicting water breakthrough time of edge water gas reservoirs with approximate linear supply boundary was derived. The water breakthrough time of a specific horizontal well was calculated,and the related influencing factors were analyzed. The results show that the breakthrough time of edge water increases with the increase of the length of horizontal section;the breakthrough time decreases with the increase of gas well production,and the speed of reduction increases gradually. Compared with the prediction formula of water breakthrough time of gas wells without considering non-Darcy effect,the calculation accuracy of this formula is higher and more coincident with actual production. The research results have a guiding role in the scientific and efficient development of edge water gas reservoirs.

Key words: edge water gas reservoirs, high-yield horizontal wells, non-Darcy effect, water breakthrough time

CLC Number: 

  • TE32+9
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