Oil & Gas Geology ›› 2009, Vol. 30 ›› Issue (3): 388-392.doi: 10.11743/ogg20090321

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An analysis on influential parameters for modeling permeability profile during underbalanced drilling in horizontal wells

Lu Hongyou1,2, Chen Xiaohong1, Huang Handong1   

  1. 1. State Key Laboratory of Hydrocarbon Resources and Prospecting, China University of Petroleum, Beijing 102249, China;
    2. Offshore Oil Producing Plant, SINOPEC Shengli Oilfield Company, Dongying, Shandong 257237, China
  • Received:2008-12-20 Online:2009-06-25 Published:2012-01-16

Abstract:

Underbalanced drilling can reduce or even eliminate formation damage from drilling fluid invasion,and therefore,it is getting more and more popular.To ensure that the bottom hole pressure is lower than the re-servoir pressure,it is essential to adjust the gas fraction of the drilling fluid and to accurate inflow calculations.The permeability profile is an important parameter to calculate inflow.We have derived a model for calculating permeability profile and proved it by applying numerical simulator.Parameters such as formation heterogeneity,formation pressure and drilling rate were studied in this paper.The results show that the model is applicable in certain areas.

Key words: perforation length, model for calculating permeability profile, underbalanced drilling, horizontal well

CLC Number: