Wellbore Stability: Role of Viscoelasticity of Drilling Fluids - Management Assignment Help

Assignment Task:

Task:

Background
Drilling of wells for exploration and production is a routine activity in hydrocarbon field development and en- suring geomechanical integrity of well is vital for efficient and effective field operations of a successful venture. Wellbore instability is the main cause of drilling difficulties in petroleum industry [1]. Wellbore instability is mainly caused by the imbalance created between the formation stress and strength when the wellbore is drilled. Some of the issues associated with wellbore instability are stuck pipe and Bottom Hole Assemblies, lost circu-lation, inability to land casing, poor logging and cementing conditions which may cause serious complications during drilling. It is stated that wellbore stability problems may cost the industry around US$ 8 billion world- wide. Therefore, maintaining a stable wellbore during drilling is a subject of major concern in the industry but yet to receive substantial attention in the research.

2 Development of the problem
Underground formations are subjected to in-situ stresses resulting from earth forces. Before opening any type of excavation these in-situ stresses are uniformly distributed in the rock and the formation is under equilibrium state of stress. When a wellbore is drilled within this rock the existing stress field is altered and a new set of stresses are induced in the rock near the wellbore region. Besides, it is clear that rocks of sedimentary basins are porous to some degree and under natural conditions, the pores are filled with formation fluids under pressure. Pore fluid are considered to exert tensile stress on the rock material and hence modified the in-situ stresses [1]. Following Terzaghi’s definition of effective stress [2, 3]:

The aim of this research is to develop fundamental knowledge on how drilling fluids affect the stress regime and hence the stability of the rockmass near the wellbore region during drilling operations. In particular, the objectives of this research include:
• Critical review of literature on models describing stress in viscoelastic and colloidal suspensions in order to find a suitable model to represent drilling fluid.
Implementation of identified viscoelastic stress model into expressions for near wellbore stress regime.
Investigate the magnitude of modulus of elasticity of drilling fluid to support a weak formation and subsequently infer the density of drilling fluid needed.

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