Results 21 to 30 of about 7,980,398 (271)

On the plastic collapse of horizontal saddle supported storage vessels [PDF]

, 2003
The present paper summarises a comprehensive programme of work on collapse loads of horizontal cylindrical saddle supported storage vessels. A programme of tests was conducted on 40 model vessels that included both welded and loose saddles.
Tooth, A.S., Spence, J., Nash, D.H.
core   +3 more sources

Uncertainty Evaluation of Safe Mud Weight Window Utilizing the Reliability Assessment Method

Energies, 2019
Due to the uncertainty of formation properties and improper wellbore stability analysis methods, the input parameters are often uncertain and the required mud weight to prevent wellbore collapse is too large, which might cause an incorrect result ...
Tianshou Ma, Tao Tang, Ping Chen, Chunhe Yang   +3 more
doaj   +1 more source

A review of karst collapse mechanisms

Carsologica Sinica, 2023
Karst collapse is a global geohazard and has been reported to occur in 23 countries, including China, the United States of America, Canada, South Africa, Italy, France, the United Kingdom, Germany, Russia, and Turkey.
Xiaozhen JIANG, Tao FENG, Zhiwen ZHENG, Mingtang LEI, Wei ZHANG, Xiao MA, Xiaojuan YI   +6 more
doaj   +1 more source

Study and application on influence mechanism of instability and collapse of drainage borehole on gas drainage

Meitan xuebao, 2023
The instability and collapse of drainage boreholes is one of the key problems that hinder the efficient extraction of coal-bed methane (CBM). In order to solve the problem of instability and collapse of extraction boreholes in soft coal seams, based on ...
Xuebo ZHANG, Hao WANG, Ming YANG, Pan WANG, Linxiu HAN   +4 more
doaj   +1 more source

Horizontal saddle supported storage vessels - a parametric study of plastic collapse loads [PDF]

, 2003
Previous work by the present authors compared various theoretical methods with simple experiments for the plastic collapse load on end supported vessels loaded centrally by rigid saddles.
Tooth, A.S., Chan, G.C.M., Spence, J., Nash, D.H.   +3 more
core   +3 more sources

Collapse Pressure Prediction for Marine Shale Wellbores Considering Drilling Fluid Invasion-Induced Strength Degradation: A Bedding Plane Slip Model

Eng
The stability of deep marine shale wellbores is influenced by both bedding anisotropy and drilling fluid intrusion. Existing models fail to adequately account for the coupled effects of intrusion depth and strength degradation.
Zhilei Zhang, Chunping Li, Yuan Geng, Baohua Yu, Sicong Meng, Lihui Wang   +5 more
doaj   +1 more source

Local Buckling Characteristics of Stainless-Steel Polypropylene Deep-Sea Sandwich Pipe under Axial Tension and External Pressure

Energies, 2021
In this paper, the effects of different loading paths of axial tension and external pressure on the collapse pressure of sandwich tubes are studied by experiments and finite element models. The difference of the two loading paths is investigated.
Jianxing Yu, Weipeng Xu, Nianzhong Chen, Sixuan Jiang, Shengbo Xu, Mengxue Han   +5 more
doaj   +1 more source

Nonlinear Buckling Finite Element Analysis to Estimate Collapse Pressure of Thick Cylinder under Hydrostatic Pressure [PDF]

한국해양공학회지, 2019
In order to perform a pressure chamber experiment with a circular cylindrical pressure vessel, the dimensions of the cylinder need to be determined in the range of the maximum externally applied pressure of the chamber to create the collapse process.
Jae-Hwan Lee, Byoungjae Park, Hyuek-Jin Choi   +2 more
doaj   +1 more source

Wellbore stability analysis of layered shale based on the modified Mogi–Coulomb criterion

Petroleum, 2020
Borehole instability was frequently encountered during shale gas drilling. Most conventional models are not applicable to layered formation's wellbore stability analysis on account of anisotropic strength characteristic.
Xu Yang, Xiangchao Shi, Yingfeng Meng, Xiaoyong Xie   +3 more
doaj   +1 more source

Rock response characteristics in the area of the hidden collapse column induced by mining

Energy Exploration & Exploitation, 2023
The hidden collapse column has the characteristics of concealment, suddenness and connection with karst water, which pose a serious threat to safe production in coal mines.
Haixiao Lin, Duan Zhang, Xiaogang Wu, Boyang Zhang, Xin Feng   +4 more
doaj   +1 more source