Anisotropic damage mechanics as a novel approach to improve pre-and post-failure borehole stability analysis [PDF]
, 2013 Anisotropic damage distribution and evolution have a profound effect on borehole stress concentrations. Damage evolution is an irreversible process that is not adequately described within classical equilibrium thermodynamics.
Karrech, Ali +2 more
core +1 more source
Borehole Stability in Densely Welded Tuffs [PDF]
, 1992 The stability of boreholes, or more generally of underground openings (i.e. including shafts, ramps, drifts, tunnels, etc.) at locations where seals or plugs are to be placed is an important consideration in seal design for a repository (Juhlin and ...
Daemen, J. J. K., Fuenkajorn, K.
core +1 more source
Formula Development and Application of Wall Protection Slurry for Long-distance Horizontal Freezing Boreholes and Thorough Piles [PDF]
E3S Web of Conferences, 2020 Since complex barriers need to be passed through during the process of drilling long-distance horizontal freezing boreholes, the stability of the borehole wall at the soft and hard stratum interface is the key in controlling the deflection of the ...
Jiang Guojing +6 more
doaj +1 more source
Sub-hourly simulation of residential ground coupled heat pump systems [PDF]
, 2008 Residential Ground Coupled Heat Pump systems are usually characterised by an ON/OFF behaviour of the heat pump with typical cycling frequencies of 1 - 4 cycles per hour.
Bernier, Michel, Kummert, Michael
core +4 more sources
Advances in Materials Science and Engineering, 2018 Because gas boreholes are easy to damage by integrated coal mining and gas exploration, based on the practice of relieving pressure in deep thin coal seams in the Huainan mining area, a multidimensional coupling numerical simulation method was used to ...
Fei Xue, Xiaowei Feng
doaj +1 more source
Real-time prediction method of borehole stability
Petroleum Exploration and Development, 2008 Based on the close relationship between seismic and logging information, a real-time prediction model of borehole stability is established using seismic, logging, and geological data to control borehole wall sloughing instability.
Chao WU, Mian CHEN, Yan JIN
doaj +1 more source
Study on the Mechanism of Ionic Stabilizers on Shale Gas Reservoir Mechanics in Northwestern Hunan
Energies, 2019 The shale of the lower Cambrian Niutitang formation in northwestern Hunan is an ideal reservoir for shale gas. There is a close connection between borehole stability and drilling fluid in shale gas drilling.
Pinghe Sun +7 more
doaj +1 more source
CBM drilling technical parameter optimization methodology and software development: a case study of LUAN mining area [PDF]
Anais da Academia Brasileira de Ciências, 2021 Based on the leakage of the coalbed methane (CBM) drilling engineering practice of Luan mining area in China, the author determines the safe drilling fluid density range for the stable borehole wall based on borehole wall collapse and fracture pressure ...
YULIANG GUO +5 more
doaj +1 more source
Increasing the Efficiency of Sealing the Borehole in Terms of Spacer Pumping Time
Energies, 2021 The tightness of a borehole is essential for its long-term durability. For this purpose, the column of the pipe is sealed with cement slurry. After contacting the slurry, mud in the borehole is removed. However, the slurry does not effectively remove the
Marcin Kremieniewski +2 more
doaj +1 more source
Analysis of borehole stability in gas drilling using a thermal elastoplastic coupling model
Energy Science & Engineering, 2021 Gas drilling causes lower pressure in the borehole and the Joule‐Thomson effect to occur at the bit nozzle, resulting in a temperature distribution in the borehole different from that in the original formation.
Zhongxi Zhu +3 more
doaj +1 more source