Results 31 to 40 of about 5,239 (198)

Large‐scale experiments of the borehole instability on shale formation influenced by drill pipe rotation

Energy Science & Engineering, 2019
Wellbore instability happens mostly in the shale formation. Early researches have studied thoroughly on the physicochemical and mechanical mechanism that causes instability.
Yuanwei Sun, Meng Meng, Xiaodong Dai, Yuanfang Cheng, Yanli Wang, Shuxin Dong, Yongchao Hao, Guowei Peng   +7 more
doaj   +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

Effect of Drilling Fluid Invasion on Natural Gas Hydrate Near-Well Reservoirs Drilling in a Horizontal Well

Energies, 2021
Horizontal wells can significantly improve the gas production and are expected to be an efficient exploitation method for the industrialization of natural gas hydrates (NGHs) in the future.
Qibing Wang, Ren Wang, Jiaxin Sun, Jinsheng Sun, Cheng Lu, Kaihe Lv, Jintang Wang, Jianlong Wang, Jie Yang, Yuanzhi Qu   +9 more
doaj   +1 more source

Wellbore Stabilization Technology of “Fluid-Solid-Chemical Coupling” in Continental Shale Oil—A Case Study of Shale Oil in Block GL

Energies, 2022
During the oil shale drilling in Group Q of Block GL, the shale is prone to hydration, deterioration, sidewall exfoliation and frequent collapse, which affects the efficient exploration and development of shale oil.
Xin Ai, Mian Chen
doaj   +1 more source

Computational study of reservoir sand production mechanisms [PDF]

, 2019
A numerical model is developed to simulate fluid flow conditions around a wellbore and to evaluate mechanisms governing fluid flow, pressure gradients, rock failure and the ensuing sand production.
Dassault Systèmes, Kaiser PK, Knappett J, Malvern LE, Manger GE, Mayne PW, Millikan CV, Nauroy JF, Papamichos E, Papamichos E, Vermeer PA, Wang H, Wang J, Wu HC   +13 more
core   +1 more source

Modelling of Time-Dependent Wellbore Collapse in Hard Brittle Shale Formation under Underbalanced Drilling Condition

Geofluids, 2019
In recent years, the lithologic traps in a mid-depth formation are the focus of oil or gas exploration and development for eastern oilfields in China.
Shanpo Jia, Zhiqiang Xiao, Bisheng Wu, Caoxuan Wen, Lufeng Jia   +4 more
doaj   +1 more source

Using One-Dimensional Geomechanical Model for Determining the Safe Wellbore Orientation of Zubair Reservoir, Southern Iraq

Iraqi Geological Journal, 2023
The wellbore instability issues are firmly occurring in the Iraqi oilfield and particularly in the southern region of Iraq. It is causing a significant loss of time dealing with many types of downhole problems, as well as an increase in the ...
Fadhil Alshibli, Ayad Alhaleem
doaj   +1 more source

Study on the influence of drilling fluid filtration on stability of coalbed wellbore

Meikuang Anquan, 2021
Coal rock has many porous characteristics, such as cleavage, pore and so on. Drilling fluid is easy to invade into coal bed rock, which is easy to cause wellbore instability.
ZHANG Yi, CHEN Dong, ZHANG Hui, LIU Mengmeng, LIU Fu, WEI Kai
doaj   +1 more source

Study on Wellbore Stability and Instability Mechanism in Piedmont Structures [PDF]

The Open Petroleum Engineering Journal, 2015
Piedmont tectonic belts are rich of oil and gas resources, however the intense tectonic stress and broken formation may cause great drilling problems in piedmont structures such as borehole collapse, lost circulation and gas cutting. Through analysis of in situ stress properties, bedding structure and mechanical characteristics, wellbore instability ...
Qiang Tan, Baohua Yu, Jingen Deng, Kai Zhao, Jianguo Chen   +4 more
openaire   +3 more sources

THE ANALYSIS OF WELLBORE INSTABILITY BASED ON THE HOEK-BROWN FAILURE CRITERION USING GEOMECHANICAL UNITS AND DISCONTINUITIES EVALUATION

Rudarsko-geološko-naftni Zbornik
The accuracy of wellbore instability assessment becomes reliable when sufficient geomechanical model data and appropriate failure criteria parameters are used.
Mohamadali Chamanzad, Majid Nikkhah, Ahmad Ramezanzadeh, Misha Pezeshki, Imandokht Mostafavi   +4 more
doaj   +1 more source