Results 31 to 40 of about 411,244 (209)

Strength analysis of perforated casing in ultra-deep horizontal shale wells during sublevel acidizing and hydraulic fracturing process

Advances in Mechanical Engineering, 2022
In the process of sublevel acidizing and fracturing, the non-uniform load on production casing is complex, and casing failure occurs frequently, which seriously affects the next step of production, stimulation, and underground safety of the oil and gas ...
Lian Zhanghua, Tuo Yuheng, Zhang Qiang, Yu Hao, Mou Yisheng, Yang Weixing   +5 more
doaj   +1 more source

Failure analysis of long round thread in horizontal well casing under multi-axis loading [PDF]

E3S Web of Conferences, 2020
The casing is subjected to complicated forces underground, and the threaded joint of the casing is the weak link of the casing. becoming more and more severe, various kinds of failure accidents often occur in practical use.
Tiejun Lin, Zhaoyang Li, Zhaoyang Zhao, Xiaomin Bao, Qiang Zhang   +4 more
doaj   +1 more source

Marine reservoir corrections for Moreton Bay, Australia [PDF]

, 2009
We present the first direct assessment of marine reservoir effects in the Moreton Bay region using radiocarbon dating of known-age, pre-AD 1950, shell samples from the east coast of Stradbroke Island and archaeological shell/charcoal pairs from Peel ...
Petchey, F., Ulm, S., Ross, A., Ulm, Sean, Sean, Ulm, Petchey, Fiona, Ross, Annie   +6 more
core   +1 more source

Experimental study of shale drillability with different bedding inclinations under varying wellbore pressure conditions

Journal of Petroleum Exploration and Production Technology, 2021
In the practice of shale gas development engineering, it is important to understand the physical and mechanical properties of shale. The bedding inclinations of shale are known to significantly influence its physical and mechanical properties. This study
Shuai Chen, Xiangchao Shi, Heng Bao, Leiyu Gao, Jie Wu   +4 more
doaj   +1 more source

Numerical Investigation of Hydraulic Fracture Propagation Morphology in the Conglomerate Reservoir

Geofluids, 2022
The random distribution of gravels makes the conglomerate reservoir highly heterogeneous. A stress concentration occurs at the gravel-matrix interfaces owing to the embedded gravel and affects the local mechanical response significantly, making it ...
Zehao Xu, Xiangjun Liu, Lixi Liang
doaj   +1 more source

Methodological approaches to determining the marine radiocarbon reservoir effect [PDF]

, 2005
The marine radiocarbon reservoir effect is an offset in 14C age between contemporaneous organisms from the terrestrial environment and organisms that derive their carbon from the marine environment.
Dugmore, A., Cook, G.T., Ascough, P.L.
core   +1 more source

Characteristics and drainage modes of coalbed methane resources in closed coal mines in Yangquan and Jincheng Mining Areas

Meitan kexue jishu
Affected by factors such as coal resources exhaustion, elimination of outdated and excess capacity, the number of closed coal mines in Shanxi Province has increased year by year, and the evaluation and exploration of closed or abandoned coal mine coalbed
Yang WANG, Jie XIANG, Yong QIN, Shangbin CHEN, Yanming ZHU, Manli HUANG, Ying SHI   +6 more
doaj   +1 more source

Murray-Darling basin freshwater shells: riverine reservoir effect [PDF]

, 2009
We report carbon isotope measurements on pre-bomb museum samples of freshwater mussel shells collected alive from riverine locations in New South Wales, Australia. The calculated reservoir ages, ranging from -60 to +112 years, are much smaller than those
Fink, D, Jacobsen, Geraldine, Gillespie, Richard, Fink, David, Gillespie, R, Petchey, F, Geraldine Jacobsen, Richard Gillespie, Petchey, Fiona, David Fink, Fiona Petchey, Jacobsen, GE   +11 more
core   +1 more source

Petrographic image classification of complex carbonate rocks from the Brazilian pre-salt using convolutional neural networks

Scientific Reports
Machine learning (ML) algorithms have been widely applied across geosciences for tasks such as data conditioning, resolution enhancement, and image classification.
Mateus Basso, João Paulo da Ponte Souza, Guilherme Furlan Chinelatto, Luis Augusto Antoniossi Mansini, Alexandre Campane Vidal   +4 more
doaj   +1 more source

Conserved binding mode but diverse interfaces of MreC‐PBP2 interactions

FEBS Letters, EarlyView.
The crystal structure of abMreC reveals a conserved two β‐barrel architecture and provides structural insights into its role within the bacterial elongasome. The abMreC–abPBP2 complex model identifies the molecular basis of MreC‐mediated PBP2 recognition, contributing to the regulation of peptidoglycan synthesis.
Hyunseok Jang, Hyo Been Jin, Chang Min Kim, So Yeon Lee, Hyun Ho Park   +4 more
wiley   +1 more source