Introduction to Underbalanced Drilling
Jaf, Pshtiwan / Farkha, Sarhad / Khoshnaw, Farhad
Conventional drilling techniques do not suffice in many wells when ROP optimization, well productivity, and formation damage are concerns. This can be especially true in mature fields and horizontal drilling applications. During underbalanced drilling (UBD), the pressure within the wellbore is kept lower than the pressure of fluid in the formation. The resulting inflow of fluid from the reservoir can be controlled during the entire drilling pr...