Petroleum and Coal Pet Coal (2017); 59(3): 389-396 ISSN 1337-7027 an open access journal Article Open Access MODERN EFFECTIVE CEMENTING PRACTICES: A CASE STUDY OF WELL “A” IN THE NIGER DELTA Aghogho Enaworu 1* , Adewale Adeniji 1 , Efeoghene Enaworu 2 and Ifeanyi Seteyeobot 2 1 Department of Petroleum Engineering, University of Benin, Benin-City 2 Department of Petroleum Engineering, Covenant University, Ota Received April 13, 2017; Accepted June 12, 2017 Abstract Cementing is one of the most important operations in the drilling phase of an oil and gas well and it should therefore be efficiently carried out. The main factors that contribute to an effective cementing operation are cement slurry design, displacement mechanism, pre-job operation and finally the calculations involved. These factors were carefully analyzed in this work. A field cementing procedure of the 13-3/8”and 9-5/8” casing cementation for well “A” was observed, all data from the cementing and casing program, volumes of cement slurry, number of sacks of cement used and cement bond evaluation result were also analyzed as postmortem criteria. From this, a conclusion was drawn that the cementing procedures of the well were of standard which prompted its adoption for other wells. Thus, we present effective cementing practices in this work. Keywords: Cementing; Displacement mechanism; Cementing procedure; Casing; Slurry, Spacer fluid. 1. Introduction Cementing is a procedure that involves the mixing and pumping of cement slurry through the annulus. When setting, the cement will establish a bond between the pipe and the for- mation. Cementing plays an important role in the life of an oil well; therefore, the most impor- tant stage of well drilling is the cementing stage. Cement is used as the main impenetrable seal in gas and oil well drilling. It is used extensively as a seal between the casing and the borehole, bonding the casing to the formation and providing a barricade to the flow of fluids from, or into the formations behind the casing and into the subsequent hole-section. Cement is used for corrective work on producing wells. It can be used to repair leaks in casings. Fluid migration is usually prevented by the cement sheath between the hole and casing [1] . Cement serves as backing for the casing at the surface where the axial loads on the casing, due to the weight of the wellhead and Blow-Out Preventer (BOP) connected to the top of the casing string, are extremely high. Buckling of the casing is prevented by the presence of the cement sheath. However, in oil and gas industries, skills and technology with which jobs are carried out are dynamic. Over the years, new technologies have been developed and used in the cementation of oil and gas wells. Consequently, the present-day oil and gas cementing job is all about how cementing job is done and it involves technology, skills and developments which has been discovered over the years to enhance a very good cementing job. A poor cementing job is a serious problem during the drilling phase of an oil and gas well. Consequences of failing to perform a good cement job includes: migration of fluid from one zone to another and this can lead to a blow-out, vibration of casing string while drilling the next hole-section, corrosion of casing, collapsing of formation, and sand production when flowing the well. This work is aimed at investigating the process, procedure and to analyze the problems encountered during the cementation of a well in the Niger Delta. In order to achieve this, the following will be embarked upon: analysing the wellbore condition before the cement job is 389 brought to you by CORE View metadata, citation and similar papers at core.ac.uk provided by Covenant University Repository