نتایج جستجو برای: Rate of Penetration (ROP)
تعداد نتایج: 21196635 فیلتر نتایج به سال:
The rate of penetration (ROP) is one of the vital parameters which directly affects the drilling time and costs. There are various parameters that influence the drilling rate; they include weight on bit, rotational speed, mud weight, bit type, formation type, and bit hydraulic. Several approaches, including mathematical models and artificial intelligence have been proposed to predict the rate o...
one of the most commonly used techniques to reduce the corrosion rate of rebar in concrete is addition substances named corrosion inhibitors into the concrete. corrosion inhibitor is chemical compounds that were added to concrete to prevent corrosion of steel in concrete. sodium nitrate is a type of anodic inhibitors that this study investigatesthe effect of this inhibitor on the properties of ...
To eliminate or reduce stick–slip vibration in torsional of the drilling string and improve rate penetration (ROP), a model considering ROP was established based on multidimensional string. The verified by simulation analysis. characteristics three stages stationary, slip, stick were analyzed. This paper investigated influence rotary torque, speed, weight bit (WOB) vibrations drill Based this, ...
Abstract Hot-point drills have been widely used for drilling boreholes in glaciers, ice caps and sheets. A hot-point drill melts through the thermal head at its bottom end. Penetration occurs a close-contact melting (CCM) process, which is melted, meltwater squeezed out by exerted force applied on head. During drilling, thin water film formed to separate from surrounding ice. For drill, rate of...
the study of air infiltration into the buildings is important from several perspectives that may be noted to energy and design of hvac systems, indoor air quality and thermal comfort and design of smoke control systems. given the importance of this issue, an experimental and numerical study of air infiltration through conventional doors and windows has been explored in iran. to this end, at fir...
The rate of penetration (ROP) is an important indicator affecting the drilling cost and performance. Accurate prediction ROP has guiding significance for increasing speed reducing costs. Recently, numerous studies have shown that machine learning techniques are effective means to accurately predict ROP. However, in petroleum engineering applications, its robustness generalization cannot be guar...
The rate of penetration (ROP) is an important parameter that affects the success a drilling operation. In this paper, research approach based on different artificial neural network (ANN) models to predict ROP for oil and gas wells in Nam Con Son basin. first process collecting evaluating parameters as input data model. Next find model capable predicting most accurately. After that, study will e...
This study investigates the transient behavior of an electro-thermal drilling probe (ETDP) during a close-contact melting process within glacier. In particular, present work analyzes effect tip temperature on formation molten thin liquid films and subsequent rate penetration (ROP) through numerical simulation. We used commercial code ANSYS Fluent (v.17.2) to solve Reynolds-averaged Navier–Stoke...
employees always concern about losing their job , or in other word , losing their income resources. for this purpose, every government requires strong system for covering these concerns. the unemployment insurance (ui) program’s can be used for achieving this goal. in this thesis, we price ui based on the insurance history of employee and the duration of being unemployed. we use the weibull dis...
the hypothesis is that recent and frequent exposure to lexical items leads to a more fluent production of speech in terms of rate of speech. to test the hypothesis , a one- way anova experimental design was carried out. 24 senior student of efl participated in a one-way interview test. data analyses revealed that those who were exposed frequently to the lexical items over a week prior to inte...
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