Welcome to International Journal of Emerging Technologies in Engineering Research (IJETER)

Volume 9, Issue 11, November (2021)

S.No	Title & Authors	Full Text
1	Optimal Annular Frictional Loss Modelling In Constant Bottom Hole Pressure Variant of Managed Pressure Drilling John Lander Ichenwo, Emenike Nyeche Wami, Nmegbu C.G.J, Fidelis Wopara Abstract - Managed pressure drilling (MPD) as a drilling system is the product of elevated cost of Non Productive Time(NPT) caused by the closeness of formation pore pressure and fracture pressure which is regular in deep off shore, off shore, high pressure and high temperature and depleted reservoirs as well as some onshore drilling operations. Proper computation of AFL in constant bottom-hole pressure CBHP variation of MPD was studied in this work. An empirical model was derived to efficiently estimate the AFL value that will form part of the BHP term required to maintain the BHP constant between the pore pressure and the fracture pressure. The generated empirical AFL correlation was built using response surface methodology (RSM) where annular friction loss as the response variable was subjected to well depth(D), annular mud weight (MW), annular flow rate (Qo) and annular hydraulic diameter (Do) as predictor variables. The surface responses were modelled with and without variable interactions to minimise model errors, based on goodness of fit criteria, surface response modelled with predictor variable interaction fitted field data better with a correlation coefficient of 0.998. Model verification was performed to confirm the prediction capability and compared with existing rheological model (Power law and API RP 13D). The AFL correlation developed performed better in the estimation of AFL and Optimisation Study on the Proposed AFL Model was carried out From the result obtained, the degree of responsiveness of AFL to the predictors is in the order Mw > Qo > Da > D..	Download