Results 51 to 60 of about 11,809 (204)

Dynamic tensile strength and fracture evolution of characteristic shale with bedding and hole using linear regression theory

Deep Underground Science and Engineering, EarlyView.
The spiral conical perforations generated during methane in situ explosion fracturing operations lead to tensile fracture propagation in shale reservoirs being governed by the combined effects of impact pressure, bedding, and aperture under explosive loading. Using multiple regression analysis and digital image correlation technology, the mechanisms of
Yabo Chai, Ning Luo, Jianan Zhou, Haohao Zhang, Penglong Li, Yu Wang, Cheng Zhai, Tianran Ma   +7 more
wiley   +1 more source

Unconventional gas: potential energy market impacts in the European Union [PDF]

, 2012
In the interest of effective policymaking, this report seeks to clarify certain controversies and identify key gaps in the evidence-base relating to unconventional gas.
ALECU Corina, ERIKSSON Arne, GRACCEVA FRANCESCO, MCGLADE Christophe, PEARSON IVAN, SCHUETZ Michael, SORRELL Steve, SPEIRS James, THONHAUSER Gerhard, TOFT Peter, ZASTERA Pavel, ZENIEWSKI PETER   +11 more
core   +1 more source

Surface hydration‐induced damage in tight oil‐bearing sandy conglomerate reservoirs

Deep Underground Science and Engineering, EarlyView.
A series of techniques such as X‐ray diffraction, scanning electron microscopy, energy‐dispersive spectroscopy, conductivity tests, and infrared thermal imaging were used. The key findings are the identification of a two‐stage surface hydration process and the elucidation of the effects of various minerals and elements on the hydration process ...
Anbang Zhao, Shuheng Du, Yuan Zhang, Jinghong Hu, Bo Zhou, Yun Wei   +5 more
wiley   +1 more source

A review of the shale wellbore stability mechanism based on mechanical–chemical coupling theories

Petroleum, 2015
Wellbore instability in hard brittle shale is a critical topic related to the effective exploitation of shale gas resources. This review first introduces the physical–chemical coupling theories applied in shale wellbore stability research, including ...
Qiangui Zhang, Wenyu Jia, Xiangyu Fan, Yongchang Liang, Yang Yang   +4 more
doaj   +1 more source

A review of oil well cement alteration in CO2-rich environments [PDF]

, 2018
The purpose of this study is to examine previous works undertaken that characterise the cement alteration due to its exposure to CO2-bearing fluids attacking on the interfaces of cement-rock and cement casing, or through cement cracks, and the cement ...
Bagheri, Mohammadreza, Ganjian, Esmaiel, Shariatipour, Seyed Mohammad   +2 more
core   +1 more source

The impact of forced closure on proppant distribution of hydraulic fracturing in shale formations

Deep Underground Science and Engineering, EarlyView.
Research findings demonstrate that implementing forced closure within shale formations can remarkably mitigate proppant settlement, concurrently increasing the effective propped surface area from 29.74% to 38.68%. Abstract Forced closure is widely used in conventional oil and gas reservoirs to promote uniform proppant placement.
Tongxuan Gu, Hanyi Wang, Quan Gan, Shuang Zheng   +3 more
wiley   +1 more source

Porothermoelastic Response of a Borehole in Fluid-Saturated Medium Subjected to Thermal Osmosis Effect

Geofluids, 2023
With the thermo-hydro-mechanical coupling process considered, this paper derives a set of analytical porothermoelastic solutions to field variables including the stress, displacement, and pore pressure fields to evaluate the wellbore stability around a ...
Hai Lin, Jingen Deng, Xiaocheng Zhang, Jiajia Gao   +3 more
doaj   +1 more source

Initial Feasibility Study to Drill and Core the Ocean Mantle [PDF]

, 2011
An initial feasibility study (Pilisi and Whitney, 2011) of drilling through the Mohorovičić discontinuity (Moho) into the oceanic mantle specifically focused on future requirements for planning, drilling and coring a hole 500 m into the oceanic mantle ...
Bill Whitney, Nicolas Pilisi
core   +1 more source

Mechanistic insights across curing regimes for enzymatic and biopolymer‐optimized reinforcement in rock masses

Deep Underground Science and Engineering, EarlyView.
This study examines the effects of curing temperature on the mechanical behavior of underground rock masses treated with enzyme‐induced calcite precipitation (EICP) and an innovative biopolymer‐modified EICP (BP‐EICP). Abstract Biocementation is an innovative and sustainable technique for reinforcing weak and weathered rock masses in natural and ...
Mary C. Ngoma, Oladoyin Kolawole
wiley   +1 more source

Study on the Vertical Stability of Drilling Wellbore under Optimized Constraints

Applied Sciences
With the development of coal resource extraction and wellbore construction proceeding towards deeper depths, the stability of drilling wellbore structures has become increasingly severe, even posing a barrier to the use of drilling method technology in ...
Ruixue Pan, Jimin Liu, Hua Cheng, Haixu Fan   +3 more
doaj   +1 more source