Results 11 to 20 of about 2,972,520 (248)

Smart lost circulation materials for productive zones

Journal of Petroleum Exploration and Production Technology, 2018
Lost circulation has been a serious problem while drilling that may lead to heavy financial costs in the form of lost rig time and lost mud fluid. In severe cases, it can lead to well blowout with serious environmental hazards and safety consequences ...
Ahmed Mansour, Arash Dahi Taleghani, Saeed Salehi, Guoqiang Li, C. Ezeakacha   +4 more
doaj   +2 more sources

Lost circulation in fractured carbonate formations: Mechanisms, treatment strategies and field evidence from Kurdistan Region of Iraq [PDF]

Journal of Engineering and Applied Science
Lost circulation is a recurring and costly challenge in drilling operations, causing severe wellbore instability, non-productive time (NPT), and increased drilling costs.
Jagar A. Ali, Awar Khalid, Arya Issa, Mardin Abdalqadir   +3 more
doaj   +2 more sources

The application of deep learning algorithms to classify subsurface drilling lost circulation severity in large oil field datasets

SN Applied Sciences, 2021
In this paper, we present how precise deep learning algorithms can distinguish loss circulation severities in oil drilling operations. Lost circulation is one of the costliest downhole problem encountered during oil and gas well construction.
Sajjad Mardanirad, David A. Wood, Hassan Zakeri   +2 more
doaj   +1 more source

Simulating Fracture Sealing by Granular LCM Particles in Geothermal Drilling

Energies, 2020
Lost circulation occurs when the returned fluid is less than what is pumped into the well due to loss of fluid to pores or fractures. A lost-circulation event is a common occurrence in a geothermal well.
Lu Lee, Arash Dahi Taleghani
doaj   +1 more source

Prediction of drilling fluid lost-circulation zone based on deep learning [PDF]

, 2023
Lost circulation has become a crucial technical problem that restricts the quality and efficiency improvement of the drilling operation in deep oil and gas wells.
Lijun You, Zhenjiang You, Ma, Chenglin, You, Zhenjiang, Chenglin Ma, Kang, Yili, Yili Kang, Chengyuan Xu, Xu, Chengyuan, You, Lijun   +9 more
core   +1 more source

Identification of Leakage Points and Evaluation of Leakage Parameters Based on Photoelectric Absorption Cross-Section Index

Cejing jishu, 2023
Lost circulation can increase operational costs, delay project schedules, and influence the response of logging data to formation information through plugging fluids.
SUN Yuhong, ZHANG Zhihu, XU Jingkang, TAN Weixiong, ZHANG Hao, ZHANG Lei   +5 more
doaj   +1 more source

Analysis of lost circulation on the Norwegian Continental Shelf [PDF]

, 2021
Lost circulation (downhole losses of drilling fluid) is defined by the absence or reduction of drilling fluid pumped through the drill string while drilling the wells, which filtrates the formation instead of flowing up to the surface.
Schaathun Grelland, Sander
core  

Development and application of guar gum crosslinked gel with adjustable gelation time for total loss treatment

Petroleum, 2023
To remediate the problem of severe or total losses, and meet the requirements of borehole plugging and pumping at different well depths, a novel crosslinked polymer gel (named HPG/Zr gel) with controlled gelation time and high gel strength was developed ...
Zhengqiang Xiong, Fan Fu, Zhifei Zou, Xiaodong Li, Shixian Tao, Yanning Li   +5 more
doaj   +1 more source

Impact of Anaemia and Dysregulated Iron Metabolism on COVID-19 Clinical Outcome – Review Article

Southeastern European Medical Journal, 2021
Coronavirus disease-19 (COVID-19) is a disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) that can manifest in a wide range of forms, but the most common symptoms are fever, headache, fatigue, respiratory problems, lost sense ...
Matea Bogović, Robert Rončević, Stjepan Grga Milanković   +2 more
doaj   +1 more source

A new model for predicting fluid loss in fracture-porosity reservoir

Oil & Gas Science and Technology, 2021
Drilling fluid loss always occurs in fracture-porosity reservoirs and it causes severe problems. To reduce and prevent lost circulation, it is important to get to know the cause and the characteristic of drilling fluid loss.
Liu Jinjiang, Zhang Fuxing, Qian Peng, Wu Wenlin   +3 more
doaj   +1 more source