Results 21 to 30 of about 34,329 (209)

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, Miłosz Kędzierski, Sławomir Błaż   +2 more
doaj   +1 more source

Characteristics of Stress-Displacement-Fracture Multi-Field Evolution around Gas Extraction Borehole

Energies, 2023
To ensure the effectiveness of the gas extraction borehole, it is necessary to investigate the stress-displacement-fracture evolution of the coal around the borehole.
Xiaoyan Sun, Qican Ran, Hao Liu, Yanhao Ning, Tengfei Ma   +4 more
doaj   +1 more source

Present-day stress orientations and tectonic provinces of the NW Borneo collisional margin [PDF]

, 2010
Extent: 15p.Borehole failure observed on image and dipmeter logs from 55 petroleum wells across the NW Borneo collisional margin were used to determine maximum horizontal stress (σH) orientations; combined with seismic and outcrop data, they define seven
Agostinelli, Ali, Barton, Bell, Bell, Bell, Bol, Brudy, Christopher K. Morley, Franke, Hall, Hall, Hamilton, Hazebroek, Hazebroek, Heidbach, Hesse, Hillis, Hillis, Hinz, Hinz, Hiscott, Hutchison, Ingram, James, James Clark, King, King, King, King, King, Kirsch, Lambiase, Madon, Madon, Madon, Madon, Mandl, Mardia, Mark R. P. Tingay, Mastin, McGilvery, Michel, Milsom, Morley, Morley, Morley, Morley, Morley, Morley, Peška, Plumb, Richard R. Hillis, Richardson, Rosalind C. King, Sandal, Simons, Sonder, Sperner, Tan, Tingay, Tingay, Tingay, Tingay, Tingay, Tingay, Tingay, Townend, Van Viet, Yale, Yale, Yassir, Zhang, Zoback   +73 more
core   +2 more sources

Technological complex for production, transportation and storage of gas from the offshore gas and gas hydrates fields [PDF]

, 2016
Purpose. Substantiation and development of schematics acceptable for the existing technological methods of natural gas production and transportation from the offshore fields of gas or gas hydrates.
Pedchenko, L, Pedchenko, М
core   +2 more sources

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, Chaofei Wang, Yuchen Ye, Wanneng Lei   +3 more
doaj   +1 more source

Swelling Pressure of Double-Expansive Material and Its Active Support Effect for Coal Seam Gas Drainage Borehole

Advances in Materials Science and Engineering, 2018
To improve coal seam gas drainage performance, we developed a double-expansive (DE) material to seal the borehole. The swelling process of this material includes an initial swelling stage and a secondary swelling stage.
Zhiming Wang, Yuning Sun
doaj   +1 more source

From source to sink in central Gondwana: Exhumation of the Precambrian basement rocks of Tanzania and sediment accumulation in the adjacent Congo basin [PDF]

, 2016
Apatite fission track (AFT) and (U-Th)/He (AHe) thermochronometry data are reported and used to unravel the exhumation history of crystalline basement rocks from the elevated (>1000 m above sea level) but low-relief Tanzanian Craton.
Brown, Roderick, de Wit, Maarten J., Kasanzu, Charles Happe, Linol, Bastien, Persano, Cristina, Stuart, Finlay M.   +5 more
core   +1 more source

Should the structure have been underpinned? - reflection after a quarter of a century [PDF]

, 2004
A case study of a domestic structure that suffered damage as a result of foundation movement in the 1970s is examined. Conclusions and recommendations made at the time are re-visited in the light of limitations of the original site investigation and ...
Wynn, P
core   +1 more source

Stability Characteristics of Horizontal Wells in the Exploitation of Hydrate-Bearing Clayey-Silt Sediments

Journal of Marine Science and Engineering, 2022
The mechanical properties of hydrate-bearing strata in clayey-silt sediments are significantly different from those of either conventional reservoirs or hydrate-bearing sandy sediments, which poses great challenges for wellbore stability analyses.
Xiaofeng Sun, Qiaobo Hu, Yanlong Li, Mingtao Chen, Yajuan Zhang   +4 more
doaj   +1 more source

Borehole enlargement rate as a measure of borehole instability in hydrate reservoir and its relationship with drilling mud density

Journal of Petroleum Exploration and Production Technology, 2021
Borehole collapse will pose a threat to the safety of equipment and personnel during drilling operation. In this paper, a finite element multi-field coupling model for investigating borehole collapse in hydrate reservoir was developed.
Qingchao Li, Lingling Liu, Baohai Yu, Linian Guo, Sheng Shi, Linchun Miao   +5 more
doaj   +1 more source