Author(s):
1. Mihajlo Pejić, Rudarski fakultet Prijedor, Republic of Srpska, Bosnia and Herzegovina

Abstract:
This paper presents mud mobility, as displacing of mud during casing operation of cementation and influence of misaligment casing on displacing process. In the process of preparing the well for the running casing , the most important factor of the casing is mud preparing. When we speak about mud ( drilling fluid), it can act as a Newtonian fluid such as drilling (water, air, oil, etc.) or as the most common case, and these are non-Newtonian fluids. During circulation at various flushing capacities, the mud in the well has a few degrees of flow. Plastic viscosity is an increase in shear stress above the flow point and is caused by mechanical friction resistance. The installation of casing as a process requires circulation of the mud before and after therunning of the tube , which speaks about the importance of mud. Under the conditioning of the mud in the preparation well for casing cementation is meant to: reduce the strength of the gel and reduce its plastic viscosity, thus increasing the possibility of displacing of the mud from the annulus.

Key words:
mud mobility,mud displacing,the influence of the non-cenetering of the casing,the Newtonian/ Non-Newtonian fluids

Thematic field:
The exploitation of mineral resources and mining technological processes

Date of abstract submission:
21.08.2017.

Conference:
7th Balkan Mining Congress

Paper for reviews