Volume 34 Issue 3
May  2017
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2017  >  34(3): 21-26
TANG Wenquan, GAO Shuyang, WANG Chengbiao, ZHEN Jianwu, CHEN Xiaofei, CHAI Long. Research on Mechanisms of Wellbore Instability of Longmaxi Shale Formation and High Performance Water Base Drilling Fluid Technology[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(3): 21-26. doi: 10.3969/j.issn.1001-5620.2017.03.004
Citation: TANG Wenquan, GAO Shuyang, WANG Chengbiao, ZHEN Jianwu, CHEN Xiaofei, CHAI Long. Research on Mechanisms of Wellbore Instability of Longmaxi Shale Formation and High Performance Water Base Drilling Fluid Technology[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(3): 21-26. doi: 10.3969/j.issn.1001-5620.2017.03.004
shu

Research on Mechanisms of Wellbore Instability of Longmaxi Shale Formation and High Performance Water Base Drilling Fluid Technology

doi: 10.3969/j.issn.1001-5620.2017.03.004

  • 1. China University of Geosciences(Beijing), Beijing 100083;

  • 2. Sinopec Research Institute of Petroleum Engineering, Beijing 100101;

  • 3. State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100101

  • Received Date: 2017-02-21
  • Publish Date: 2017-05-31
    Abstract
  • Presently the problem of wellbore instability in long horizontal wells is still a major technical problem in hindering the development of shale gas resources in the world. To solve this problem encountered in the long horizontal well section penetrating the shaly Longmaxi Formation, XRD analysis, pore volume tests by helium adsorption, high pressure mercury test, high resolution field emission SEM, CT scanning and continuous rock engraving strength experiments were used to analyse the micro petro-fabric and physicochemical characteristics of the Longmaxi shale, and their effects on borehole stabilization. The studies showed that the Longmaxi shale was rich in brittle minerals, and the clay minerals were mainly I/S mixed layers. Pores of micro-and nano-meters in sizes were developed, and micro cracks in the formation were slit shaped and in nearly parallel distribution. The presence of water sensitive minerals and the beddings developed therein as well as the micro fractures were the main factors causing shale wellbore instability. A set of wellbore stabilization measures was presented to solve these problems using inhibitive water base drilling fluid with synergistic effect, that is, borehole wall plugging strengthening-controlled inhibitive capacity of drilling fluid-reasonable density of drilling fluid-efficient lubrication of drilling fluid. A high-performance water base drilling fluid was formulated based on this technical strategy, exhibiting good plugging, and the ability to suppress crack propagation. This drilling fluid was used in drilling the 3rd interval of two wells in the Huangjinba block, successfully resolved the problems of wellbore instability and high friction in the long horizontal section of the Longmaxi shale, providing a new clue and experiences of using water base drilling fluid in the drilling and exploring shale gas resources.

     

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