西南石油大学学报(自然科学版)

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A Bottomhole Drillability Model in Spherical Symmetric Coordinates

SHI Xiangchao1*, TAO Zuwen1,2, MENG Yingfeng1, ZHAO Xiangyang1,3, TAO Yun4   

  1. 1. State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu,Sichuan 610500,China
    2. Downhole Operation Branch,Southwest Petroleum Engineering Company,SINOPEC,Deyang,Sichuan 618000,China
    3. Research Institute of Petroleum Engineering,SINOPEC,Chaoyang,Beijing 100101,China
    4. Kuche Exploration & Development Department,CNPC Tarim Oilfield Company,Korla,Xinjiang 841000,China
  • Online:2016-08-01 Published:2016-08-01

Abstract:

Aiming at bottomhole drillability in complex stress conditions,experimental and theoretical studies were carried
out in this paper,including drillability and uniaxial compressive strength tests. A bottomhole drillability model was established
in spherical symmetric coordinates,based on the elasticity theory and Drucker-Prager strength criterion. A case was done
according to the drillability test data and well logging data from sandstone reservoir in Xujiahe group. The results show that
bottomhole drillability increases with the increase of fluid column pressure in wellbore. Bottomhole drillability also increases
along the radial direction. This drillability model can well reflect the law of bottomhole drillability and contributes to BHA
optimization design.

Key words: drillability, drucker-prager strength criterion, intermediate principal stress, fluid column pressure, well logging

CLC Number: