Manfred Eigner ME Consultancy Services Drilling Fluids 1

Manfred Eigner ME Consultancy Services Drilling Fluids 1 11/23/2020

Drilling Fluids Technology – Course Objectives – Water & Oil based Drilling Fluids – Formation damage – Deep Water considerations – HP & HT systems – Mud program 2 11/23/2020

Drilling Fluids Technology Course Objectives At the end of this course, YOU will be able to: l Define drilling fluids applications l Understand the formation damage l Define different mud systems l Understand deep water considerations with drilling fluids l Manage a drilling fluid program. 3 11/23/2020

Section 1 Water & Oil based Drilling Fluids 4 11/23/2020

Functions & Properties Introduction Drilling fluid is the lifeblood of drilling operations and defined as : l Circulating fluid l Drilling fluid technology is dominated by three factors : l Performance l Economics l Environmental concerns 5 11/23/2020

Functions & Properties Drilling Fluid Technology – The principal task of the drilling fluid is l To contribute to the success of the well construction – The drilling fluid will emphasize on : l Reservoir evaluation l Well Productivity l Hydrocarbon and Gas Recovery 6 11/23/2020

Question-1 List the Functions of a Drilling Fluid l Which ones are important for Well Control? l 7 11/23/2020

Functions & Properties l Basic functions – All basics drilling fluids functions can be split into 3 main area’s l l l Control subsurface Pressures Avoid damage to productive zones Promote Hole cleaning – Sometimes priorities may change depending on the goals and conditions of the drilling operations – Mud lubricity, low toxicity will be adapted to drilling operations 8 11/23/2020

Properties Rheology – Viscosity • Shear Stress : Unit : Lb / 100 ft 2 Force causing the shearing Surface of the platelet • Shear rate : Unit : 1 / sec ( reciprocal second) Difference of velocity between 2 platelets Distance between 2 platelets 9 11/23/2020