Experimental investigation on barite sag under flowing condition and drill pipe rotation
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ORIGINAL PAPER-PRODUCTION ENGINEERING
Experimental investigation on barite sag under flowing condition and drill pipe rotation Saeed Zaker1 · Pegah Sarafzadeh2 · Amin Ahmadi3 · Seyyed Hamid Esmaeili‑Faraj4 · Roohollah Parvizi5 Received: 13 June 2020 / Accepted: 21 August 2020 © The Author(s) 2020
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
Keywords Barite settlement · Annular space · Dynamic condition · Barite sag * Roohollah Parvizi [email protected] Extended author information available on the last page of the article
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Vol.:(0123456789)
Journal of Petroleum Exploration and Production Technology
Introduction Drilling is one of the most critical hazardous processes in the oil industry which its safety is an undeniable desire moving the researchers toward drilling fluid with controlled morphologies which can guarantee the safety and quality of this process. In detail, as the drilling process going on, accumulation of cuttings produced during drilling operation can cause drilling pipes to be stuck which in severe conditions the drilling string can be cut off and the operation aborted. In this way, it is vital for any drilling process to evacuate these cuttings to avoid such a catastrophic event. On the other hand, solubility of borate particles is the other problem which can be eliminated in some extend if oil-based muds utilize, while itself can appear a problem known as barite sag. Unfortunately, although barite sag is a well-known problem, there are limited tools which can help petroleum men to reliably detect this problem. In this way, several investiga
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