Drilling of oil well is a capital intensive project; hence, the importance of selection of proper mud system that is free from contamination cannot be overemphasized. A poor design and contaminated drilling fluid can be very costly in the life of any well. Therefore, during drilling operations care must be taken to avoid contamination of mud with cement among others. This project details experimental work and findings associated with mud contamination with cement. Also, solutions were proffered on how to manage contaminated mud systems with cement during drilling operations. The result of this work will in no small way help not only the operators but Engineers to manage this concern with dispatch when it arises, thereby minimizing down time and associated costs which affect drilling operations negatively.

Nigeria is endowed with abundant natural gas reserves. Over the years, pipelines and LNG have been the two major means of gas transportation and hence, the main utilisation media in the world. However, in some areas in Nigeria, reserves are found in difficult locations and in quantities that make their exploitation through these conventional ways techno-economically unfeasible. The goal of this study is to investigate with the aid of several economic indicators, risk analysis and sensitivity analysis; the different ways in which natural gas can be employed economically as an energy resource for both power generation and road transport. The analysis covers both the natural gas use as a Power generator, fuel -Compressed (CNG) or Liquefied (LNG) -and as a feedstock to produce other fuels -synthetic (GTL) Naphtha and Diesel (F-T diesel), and Liquefied Petroleum Gas (LPG). After a thorough scrutiny of the various options, the GTL-incorporated Power Generationwith 70% steam supply was found to be the most economical and environmentally friendly option for the energy generation. If properly harnessed, it could generate huge potential revenue for the government, resolve the epileptic power supply problem and create employment opportunities.

The production of formation sand into a well is one of the oldest problems plaguing the oil and gas industry. This is because of its adverse effects on the well productivity and equipment. In order to ensure safe operation of facilities, reduce formation damage and enhance productivity, operators spend millions of dollars on sand control techniques. Some of the most common sand exclusion techniques used for horizontal completions in Niger Delta include: the open-hole gravel pack (OHGP), stand-alone screens (SAS) and expandable sand screen (ESS). This work involves a comparative analysis of the different horizontal sand exclusion techniques. In this work, evaluating the impact of sand control techniques on the production performance in horizontal wells is evaluated. Some performance indicator tools such as the well inflow quality indicator (WIQI), performance efficiency, completion efficiency, quantity of sand produced and the production decline rate after installation of the sand control technique was used to compare the flow performance of wells equipped with these sand control techniques. The analysis involves the use of analytical models and software using the principle of nodal analysis. For the Nodal analysis, the effect of skin, reservoir pressure, gravel pack length and gravel pack permeability was investigated on the performance of the gravel pack and stand-alone screen completions techniques only. The results showed that, the expandable sand screen proved to be a better sand exclusion technique in terms of performance followed by stand-alone screens and then the open-hole gravel pack.