Results 221 to 230 of about 34,203 (251)

Borehole Stability in Shale: Beyond Mud Weight

IADC/SPE International Drilling Conference and Exhibition, 2020
Abstract Several wells in the Gulf of Mexico were analyzed to understand the source of shale instability during drilling and wireline operations. In spite of the mud weight being above the borehole collapse pressure, the wells still exhibited signs of shale instability. As such, it was evident that another mechanism was playing a role in
Ewerton Araujo, Darren Kisinger, Daniel Vidal, Barry Cresap   +3 more
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Uncertainty Analysis of Borehole Stability Problems

SPE Annual Technical Conference and Exhibition, 1995
Abstract An uncertainty analysis is conducted for borehole stability problems based on a statistical error analysis method. The uncertainty analysis shows that the parameters impacting on the safe mud weight to stabilize borehoie are rock strength followed by shale swelling, in-situ stress, pore pressure, well inclination, and so on ...
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Shale Stabilizers Improve Borehole Stability

2010
The petroleum industry is increasingly drilling more technically challenging and difficult wells, inherently expensive. Shale composes roughly 75% of the formations drilled and shale instability is the main cause of over 90% of the borehole instability-related problems. The cause of shale instability can be mechanical and chemical.
Moslavac, Bojan, Pašić, Borivoje, Gaurina-Međimurec, Nediljka   +2 more
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A Laboratory Investigation of Borehole Stability

Journal of Petroleum Technology, 1969
Before the proper technique can be selected for combatting hole problems, the causes of the problems must be identified. To understand better the nature of borehole instability, a model study was conducted in which reconstituted shale specimens were subjected to triaxial stresses, and various fluids were circulated through an axial hole.
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Borehole Stability Analysis in Deepwater Shallow Sediments

Journal of Energy Resources Technology, 2014
Deepwater shallow sediment is less-consolidated, with a rock mechanical behavior similar to saturated soil. It is prone to borehole shrinkage and downhole leakage. Assume the deepwater shallow sediments are homogeneous, isotropic, and ideally elastoplastic materials, and formation around the borehole is divided into elastic and plastic zone.
Yan Chuanliang, Deng Jingen, Lai Xiangdong, Li Xiaorong, Feng Yongcun   +4 more
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Borehole Stability Research on Weihe HDD Crossing

ICPTT 2011, 2011
In the last 20 years, with the improvement of horizontal directional drilling (HDD) crossing technology, it has become a popular and increasingly viable method for infrastructure installation in different areas within the construction industry, such as natural gas, electrical power and communication industries. Based on Geotechnical Generalized Plastic
Tiejun Lin, Zhanghua Lian, Xiaohua Zhu, Yanjie Jia, Jinhe Li, Xuqiang Ma   +5 more
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Horizontal Borehole Stability in Naturally Fractured Reservoirs

SPE/CIM International Conference on Horizontal Well Technology, 2000
Abstract For modeling naturally fractured reservoirs, the dual-porosity poroelastic model is effective and accurate to characterize stresses as well as flow fields. A generalized plane strain and dual-porosity finite element solution has been developed for analyzing horizontal borehole stability.
Jincai Zhang, J.-C. Roegiers
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Well Orientation Effect on Borehole Stability

SPE Annual Technical Conference and Exhibition, 2004
Abstract Using laboratory and field borehole stability data, an empirical correlation of borehole size and stress gradient effects is derived. Using the correlation, the well orientation effect on borehole stability is numerically studied.
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Study on Borehole Stability in Haita Basin

Applied Mechanics and Materials, 2011
The geological structure is very complex in Haita Basin, due to the difficult drilling, sidewall instability phenomena happened frequently during drilling process. And it has restricted the drilling speed and the development and exploration process seriously.
Yu Xue Sun, Jian Bo Xie, Jing Yuan Zhao
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Stability of Nail Reinforced Boreholes

2011
Rock nailing of the borehole is considered as a means to reinforce the rock and increase its borehole failure strength. The technique is modeled using Cox’s original shear-lag method. In the continuum sense, nail reinforcement is viewed as a body force that acts as a confinement.
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