NDLI: Using Lightweight or Low Viscosity Preflushes for Primary Cementing of Surface Casing

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Maleki, Amir Frigaard, Ian
Copyright Year	2018
Abstract	Preflushes are often used as part of the sequence of fluids pumped in primary cementing. Usually two functions are served by preflushes: I) to wash the drilling fluid ahead, by a combination of turbulence and chemical reaction; II) to provide a chemically compatible spacer between the lead slurry and the drilling mud. In some cases a wash precedes a spacer, but often only a single preflush is used. We consider well parameters typical of surface casing cementing in North Eastern British Columbia. Using a two-dimensional model of annular displacement flows, we show that the wash concept is flawed. In particular, in a sequence of simulations varying from intermediate density to low density we show that the wash progressively advances ahead of the lead slurry, channeling rapidly up the wide side of the annulus. Even when fully turbulent, it is ineffective at displacing mud from around the annulus, invalidating the motivation of chemical cleaning through contact time. Furthermore, the advance along the wide side of the annulus drains the volume of fluid separating the cement from drilling mud. Thus, the idea that the wash provides a barrier between slurry and and mud is invalid.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
File Format	PDF
ISBN	9780791851296
DOI	10.1115/OMAE2018-77615
Volume Number	Volume 8: Polar and Arctic Sciences and Technology; Petroleum Technology
Conference Proceedings	ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2018-06-17
Publisher Place	Madrid, Spain
Access Restriction	Subscribed
Subject Keyword	Drilling Viscosity Cements (adhesives) Turbulence Chemical reactions Density Flow (dynamics) Displacement Fluids Simulation Annulus Engineering simulation Slurries
Content Type	Text
Resource Type	Article

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