Borehole Stability Logging Analysis in Zhenjing Oilfield, Ordos Basin, China

Abstract:

There is very important practical significance for borehole stability to oil and gas drilling and production. When the mud density is too large (mud column pressure too high),the formation will be fractured. When the the mud density is too low (mud column pressure too low), the borehole wall will be collapsed, and hole will be enlarged. In this paper, the fracture pressures of the formations were determined by using the maximum tensile stress theory. The formation collapse pressures were determined by using the Coulomb - Moore intensity criteria. According to the fracture pressure and collapse pressure to evaluate the borehole stability. The two wells stability evaluation examples were given, and the borehole security mud window were calculated.

• Periodical: Applied Mechanics and Materials (Volume 344)
• Pages: 8-14
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.344.8
• Online since: July 2013
• Authors: Li Min Ran, He Ping Pan, Gong Qiang Li, Yong Gang Zhao
• Keywords: Borehole Stability, Collapse Pressure, Fracture Pressure, Security Mud Density Window, Zhenjing Oilfield

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