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首页> 外文期刊>Journal of natural gas science and engineering >CFD simulation of viscosity modifier effect on cutting transport by oil based drilling fluid in wellbore
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CFD simulation of viscosity modifier effect on cutting transport by oil based drilling fluid in wellbore

机译：粘度调节剂对井筒油基钻井液运移影响的CFD模拟

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In this study particle transportation has been predicted in a wellbore for an oil based drilling fluid containing viscosity modifier using CFD simulation. The effects of fluid viscosity on particle transport capacity of fluid were studied by considering various particle parameters such as density, diameter, shape, and initial particle concentration and wellbore inclination through using the Algebraic Slip Mixture (ASM) model. Rheology of the drilling fluid was expressed by Herschel-Bulkley non-Newtonian fluid model. The influence of viscosifier concentration on fluid rheology show that it improves carrying capacity of particles but its effect attenuates in higher concentration. For 2 ppb of viscosifier in drilling fluid, the cutting transport capacity has been increased almost 12% whereas adding 4 ppb of viscosifier, only created about 14% escalation on the transportation of cuttings. Against this positive effect viscosity modifier make more pressure drop that was a costly effect for operation and this effect had constant rate (for each ppb viscosifier, pressure drop growth is equal to 200 kPa/m approximately). Also, the results indicate higher particle density or larger particle size results in less particles transportation in the wellbore. Increasing initial solid loading has an adverse impact on the transmission of solid particles in wellbore. (C) 2016 Published by Elsevier B.V.
机译：在这项研究中，已经使用CFD模拟预测了含粘度调节剂的油基钻井液在井眼中的颗粒传输。通过使用代数滑动混合物（ASM）模型，通过考虑各种颗粒参数（例如密度，直径，形状，初始颗粒浓度和井眼倾角），研究了流体粘度对流体颗粒传输能力的影响。钻井液的流变学通过Herschel-Bulkley非牛顿流体模型表示。增粘剂浓度对流体流变学的影响表明，它提高了颗粒的载流能力，但在更高浓度下其作用减弱。对于钻井液中2 ppb的增粘剂，切屑的输送能力几乎提高了12％，而添加4 ppb的增粘剂，仅使钻屑的输送量增加了约14％。相对于这种积极作用，粘度调节剂产生了更多的压降，这对操作而言是一项昂贵的效果，并且这种效果具有恒定的速率（对于每个ppb增粘剂，压降的增长大约等于200 kPa / m）。同样，结果表明较高的颗粒密度或较大的颗粒尺寸导致较少的颗粒在井眼中的传输。初始固体载荷的增加会对井眼中固体颗粒的传输产生不利影响。 （C）2016由Elsevier B.V.发布

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