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Experimental investigation on barite sag under flowing condition and drill pipe rotation
Journal of Petroleum Exploration and Production Technology ( IF 2.4 ) Pub Date : 2020-09-02 , DOI: 10.1007/s13202-020-00988-0 Saeed Zaker , Pegah Sarafzadeh , Amin Ahmadi , Seyyed Hamid Esmaeili-Faraj , Roohollah Parvizi
Journal of Petroleum Exploration and Production Technology ( IF 2.4 ) Pub Date : 2020-09-02 , DOI: 10.1007/s13202-020-00988-0 Saeed Zaker , Pegah Sarafzadeh , Amin Ahmadi , Seyyed Hamid Esmaeili-Faraj , Roohollah Parvizi
Abstract
Using drilling fluids with optimum density is one of the most important approaches to stabilize the pressure of the bottom formation and prevent blowout through the drilling process. One of the common methods for this purpose is adding some additives with high specific gravity to the drilling fluid to tune its density. Among the possible chemicals, barite and hematite with the density of 4.2 and 5.2 g/cc are the most common additives. Unfortunately, although the application of these additives is advantageous, they have some drawbacks which the most important one is separation and settlement of solid phase called barite sag. The barite sag comes from barite, or other dense materials particles deposition resulted in undesired density fluctuations in drilling fluid can lead to mud loss, well control problems, poorly cementing and even pipe sticking which occurs in severe cases. With respect to these concerns, the current investigation is concentrated to obtain the relation between the dynamic conditions such as flow rate (0.308 and 0.19 l/s) and deviation angles of 30°,45°,60° and 90° and barite sag phenomenon through a flow loop equipment. Besides, the effect of drilling string rotational speed (70 rpm) on the barite deposition is investigated. The results not only indicate that increasing the flow rate from 0.19 l/s to 0.308 l/s can reduce the deposition rate, but also increasing the deviation angle from 45 to 60 o enhance the barite deposition to its maximum value.
Graphic abstract
中文翻译：
流动条件下重晶石下陷及钻杆旋转的实验研究
摘要
使用具有最佳密度的钻井液是稳定底部地层压力并防止钻井过程中井喷的最重要方法之一。用于此目的的常用方法之一是向钻井液中添加一些具有高比重的添加剂以调整其密度。在可能的化学物质中，密度为4.2和5.2 g / cc的重晶石和赤铁矿是最常见的添加剂。不幸的是，尽管这些添加剂的应用是有利的，但是它们具有一些缺点，其中最重要的是分离和沉降称为重晶石流挂的固相。重晶石下陷来自重晶石或其他致密材料的颗粒沉积，导致钻井液中不期望的密度波动，可能导致泥浆流失，井控问题，在严重情况下，固井不良，甚至管子粘连。针对这些问题，当前的研究集中在获得动态条件（例如流量（0.308和0.19 l / s））与30°，45°，60°和90°偏角和重晶石下垂现象之间的关系。通过流动回路设备。此外，研究了钻柱转速（70 rpm）对重晶石沉积的影响。结果不仅表明将流速从0.19 l / s增加到0.308 l / s可以降低沉积速率，而且还可以将偏离角从45增加到60 通过流动回路设备出现60°和90°以及重晶石下垂现象。此外，研究了钻柱转速（70 rpm）对重晶石沉积的影响。结果不仅表明将流速从0.19 l / s增加到0.308 l / s可以降低沉积速率，而且还可以将偏离角从45增加到60 通过流动回路设备出现60°和90°以及重晶石下垂现象。此外，研究了钻柱转速（70 rpm）对重晶石沉积的影响。结果不仅表明将流速从0.19 l / s增加到0.308 l / s可以降低沉积速率，而且还可以将偏离角从45增加到60o将重晶石沉积增加到最大值。
图形摘要
更新日期：2020-09-02
Using drilling fluids with optimum density is one of the most important approaches to stabilize the pressure of the bottom formation and prevent blowout through the drilling process. One of the common methods for this purpose is adding some additives with high specific gravity to the drilling fluid to tune its density. Among the possible chemicals, barite and hematite with the density of 4.2 and 5.2 g/cc are the most common additives. Unfortunately, although the application of these additives is advantageous, they have some drawbacks which the most important one is separation and settlement of solid phase called barite sag. The barite sag comes from barite, or other dense materials particles deposition resulted in undesired density fluctuations in drilling fluid can lead to mud loss, well control problems, poorly cementing and even pipe sticking which occurs in severe cases. With respect to these concerns, the current investigation is concentrated to obtain the relation between the dynamic conditions such as flow rate (0.308 and 0.19 l/s) and deviation angles of 30°,45°,60° and 90° and barite sag phenomenon through a flow loop equipment. Besides, the effect of drilling string rotational speed (70 rpm) on the barite deposition is investigated. The results not only indicate that increasing the flow rate from 0.19 l/s to 0.308 l/s can reduce the deposition rate, but also increasing the deviation angle from 45 to 60 o enhance the barite deposition to its maximum value.
Graphic abstract
中文翻译：
流动条件下重晶石下陷及钻杆旋转的实验研究
摘要
使用具有最佳密度的钻井液是稳定底部地层压力并防止钻井过程中井喷的最重要方法之一。用于此目的的常用方法之一是向钻井液中添加一些具有高比重的添加剂以调整其密度。在可能的化学物质中，密度为4.2和5.2 g / cc的重晶石和赤铁矿是最常见的添加剂。不幸的是，尽管这些添加剂的应用是有利的，但是它们具有一些缺点，其中最重要的是分离和沉降称为重晶石流挂的固相。重晶石下陷来自重晶石或其他致密材料的颗粒沉积，导致钻井液中不期望的密度波动，可能导致泥浆流失，井控问题，在严重情况下，固井不良，甚至管子粘连。针对这些问题，当前的研究集中在获得动态条件（例如流量（0.308和0.19 l / s））与30°，45°，60°和90°偏角和重晶石下垂现象之间的关系。通过流动回路设备。此外，研究了钻柱转速（70 rpm）对重晶石沉积的影响。结果不仅表明将流速从0.19 l / s增加到0.308 l / s可以降低沉积速率，而且还可以将偏离角从45增加到60 通过流动回路设备出现60°和90°以及重晶石下垂现象。此外，研究了钻柱转速（70 rpm）对重晶石沉积的影响。结果不仅表明将流速从0.19 l / s增加到0.308 l / s可以降低沉积速率，而且还可以将偏离角从45增加到60 通过流动回路设备出现60°和90°以及重晶石下垂现象。此外，研究了钻柱转速（70 rpm）对重晶石沉积的影响。结果不仅表明将流速从0.19 l / s增加到0.308 l / s可以降低沉积速率，而且还可以将偏离角从45增加到60o将重晶石沉积增加到最大值。
图形摘要
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