Results 111 to 120 of about 2,457,187 (381)

Balancing Hydraulic Fracturing’s Environmental and Economic Impacts: The Need for a Comprehensive Federal Baseline and the Provision of Local Rights [PDF]

open access: yes, 2013
Reliable evaluation methods is needed to ensure that investments in energy conservation measures (ECMs) and the construction of new energy efficient buildings lives up to the promised and expected performance.
Garmezy, Adam
core   +2 more sources

Research and Application of Drilling Fluid Cooling System for Dry Hot Rock

open access: yesEnergies
The drilling fluid cooling system is a key technology for reducing wellbore temperatures, improving the working environment of downhole equipment, and ensuring safe and efficient drilling in high-temperature wells.
Kuan Li   +4 more
doaj   +1 more source

Improvement in filtration properties of water-based drilling fluid by nanocarboxymethyl cellulose/polystyrene core–shell nanocomposite

open access: yesJournal of Petroleum Exploration and Production Technology, 2018
Since almost all drilling problems directly or indirectly relate to drilling fluid, improvement in drilling fluid significantly enhances drilling operations. Drilling fluid contains base fluid, suspended solid particles and chemicals.
Rahmatallah Saboori   +3 more
doaj   +1 more source

A Comprehensive Comparison Study of Empirical Cutting Transport Models in Inclined and Horizontal Wells [PDF]

open access: yes, 2017
In deviated and horizontal drilling, hole-cleaning issues are a common and complex problem. This study explored the effect of various parameters in drilling operations and how they affect the flow rate required for effective cutting transport.
Abdurrokhim, A. (Abdurrokhim)   +6 more
core  

How to recognise a kick : A cognitive task analysis of drillers’ situation awareness during well operations [PDF]

open access: yes, 2016
Acknowledgements This article is based on a doctoral research project of the first author which was sponsored by an international drilling rig operator.
Cleland, J., Flin, R., Roberts, R.
core   +2 more sources

Numerical study of cuttings transport of nanoparticle‐based drilling fluid

open access: yesEngineering Reports, 2020
Cuttings transportation from the drill bit, through the annulus, to the surface is one of the most important functions performed by drilling fluid. The prediction of drilling fluid's performance to transport cuttings in the annulus is very complex task ...
Mortatha Al-Yasiri   +2 more
semanticscholar   +1 more source

Supercompliant Lattice Boosts n‐type AgSbTe2 Thermoelectrics

open access: yesAdvanced Functional Materials, EarlyView.
The supercompliant lattice design enables the first realization of n‐type electrical transport in AgSbTe2 by overcoming intrinsic electron‐killer defects and exceeding the doping limits imposed by the conventional Hume–Rothery rule. Accordingly, the best performance n‐type Ag0.8Na0.3Sb0.6Bi0.4Te2 sample achieves a low κ of 0.27 W·m−1·K−1 that ...
Ruoyan Li   +15 more
wiley   +1 more source

Analysis of uneven density of oil-based drilling fluid caused by shale respiration [PDF]

open access: yesE3S Web of Conferences
Longmaxi shale formation has developed beddings and fractures in southern Sichuan, which is prone to well leakage and wellbore instability. In the drilling process of horizontal section of Ning 209H58-2 well, drilling fluid would loss during circulation ...
Ni Xiaoxiao   +9 more
doaj   +1 more source

Flow-Induced Stresses and Displacements in Jointed Concrete Pipes Installed by Pipe Jacking Method [PDF]

open access: yes, 2019
Transient flows result in unbalanced forces and high pressure in pipelines. Under these conditions, the combined effects of flow-induced forces along with sudden pipe displacements can create cracks in the pipeline, especially at the junctions.
Ahmad, Sajjad   +3 more
core   +2 more sources

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