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Keywords

PlasticViscosity (PV), LowgravitySolid (LGS), Rateofpenetration (ROP), Equivalent circulatingdensity (ECD), drillstringdrag.

Document Type

Research Article

Abstract

High solid content in drilling mud may affect its properties and result in uncertainties at downhole condition. It eventually contributes to poor rig operation performance and operating cost. This research focus on developing a solid control system that is suit for drilling 12.25-inch hole. The first part discussed on the effect of solid control system performance to mud properties Plastic Viscosity (PV), Yield Point (YP) and Low-Gravity Solid (LGS) while the second part of research discussed about the mud performance to Rate of Penetration (ROP), Equivalent Circulating Density (ECD) and drill string drag. The input parameters such PV, YP, LGS, ROP, LGS, ECD and drill string drag were gathered from two different set up of solid control systems that were used in Well A and Well B. The result was mainly based on the performance of old design and new design solid control system. Installation of mud flow distributor tank to channel the mud into respective shale shakers significantly enhanced the mud treatment capability and operational performance. Mud properties while drilling the 12.25-inch hole section; PV, YP and LGS values were improved by 14%, 17% and 25% respectively. The ROP improved by 25%, ECD margin by reducing additional pressure exerted using original mud from 4.9% to 2.9% and drill string drag friction factor (FF) concentrated within 0.2FF trend. Proper mud flow control and routing system at new develop design of solid control system effectively removed the solid in the drilling fluid. This improvement minimizes the tendency of frequent mud flow, screen mesh plugging and tool wear issue. Mud properties such PV, YP and LGS were maintained with an acceptable mud design envelope.

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Publication Date

31-7-2017

First Page

66

Last Page

82

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