A Computational Study of Cuttings Transport in a Horizontal Well with an Oil-Based Drilling Fluid Modified by Multiwalled Carbon Nanotubes

IF 0.58 Q3 Engineering
V. A. Zhigarev, D. V. Guzei, E. I. Lysakova, V. Ya. Rudyak, A. V. Minakov
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引用次数: 0

Abstract

We have conducted a computational study of the effect of adding multiwalled carbon nanotubes (MWCNTs) to oil-based drilling fluids on the efficiency of cuttings removal from an annular channel simulating a horizontal section of a well. To simulate the process of sludge transport in an annular channel, a mathematical model based on the Eulerian approach of a granular medium for a turbulent flow regime has been developed. The rheology of the drilling fluid modified with MWCNTs was described by the Herschel–Bulkley model with experimentally determined rheological coefficients. The base oil-based drilling fluid was an inverse emulsion with a ratio of hydrocarbon and water phases equal to 65/35. The concentration of MWCNTs in solutions varied from 0.1 to 0.5 wt %. The size of the transported sludge particles varied from 2 to 7 mm. The flow structure of a two-phase flow in an annular channel for various concentrations of MWCNTs has been studied. The dependences of the sludge removal efficiency coefficient, the average slip speed of sludge particles, and pressure losses on the concentration of nanotubes are obtained. It has been established that the addition of nanotubes leads to a significant change in the flow pattern of the drilling fluid and, as a result, to a change in the modes of cuttings transport. Addition of 0.5 wt % of MWCNTs leads to an increase in the efficiency of well flushing by approximately 40%. Thus, based on the results of the computational study, it has been shown that the addition of multiwalled nanotubes to oil-based drilling fluids can lead to an increase in the efficiency of cuttings transport in horizontal wells.

多壁碳纳米管改性油基钻井液水平井岩屑运移的计算研究
我们对在油基钻井液中加入多壁碳纳米管(MWCNTs)对模拟水平井环空通道岩屑去除效率的影响进行了计算研究。为了模拟污泥在环形通道中的运移过程,建立了基于粒状介质欧拉方法的紊流流态数学模型。用实验确定的流变系数,用Herschel-Bulkley模型描述了MWCNTs改性钻井液的流变特性。基油基钻井液是一种反乳液,烃相和水相的比例为65/35。MWCNTs溶液的浓度在0.1 ~ 0.5 wt %之间变化。输送的污泥颗粒大小从2到7毫米不等。研究了不同浓度的MWCNTs在环形通道中两相流的流动结构。得到了污泥去除效率系数、污泥颗粒平均滑移速度和压力损失与纳米管浓度的关系。已经确定,纳米管的加入会导致钻井液流动模式的显著变化,从而导致岩屑运移模式的变化。添加0.5 wt %的MWCNTs可使冲井效率提高约40%。因此,基于计算研究的结果表明,在油基钻井液中加入多壁纳米管可以提高水平井岩屑输送效率。
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来源期刊
Journal of Applied and Industrial Mathematics
Journal of Applied and Industrial Mathematics Engineering-Industrial and Manufacturing Engineering
CiteScore
1.00
自引率
0.00%
发文量
16
期刊介绍: Journal of Applied and Industrial Mathematics  is a journal that publishes original and review articles containing theoretical results and those of interest for applications in various branches of industry. The journal topics include the qualitative theory of differential equations in application to mechanics, physics, chemistry, biology, technical and natural processes; mathematical modeling in mechanics, physics, engineering, chemistry, biology, ecology, medicine, etc.; control theory; discrete optimization; discrete structures and extremum problems; combinatorics; control and reliability of discrete circuits; mathematical programming; mathematical models and methods for making optimal decisions; models of theory of scheduling, location and replacement of equipment; modeling the control processes; development and analysis of algorithms; synthesis and complexity of control systems; automata theory; graph theory; game theory and its applications; coding theory; scheduling theory; and theory of circuits.
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