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• W2078755883 abstract "Abstract The safety of lives, assets and environment continue to remain the key challenges facing the oil and gas industry in its drilling and completions operations. One important factor in ensuring that wells are drilled and completed to desired depth is the formation strength or pressure containment of the shoe after a cement job to help ensure zonal isolation around the casing shoe as well as pressure containment at the shoe while drilling the next hole section. The knowledge of formation strength estimate is essential to enhance proper planning of these wells and drilling to desired total depth, and forestalls, or at the least minimises the likelihood of not drilling to optimum depth or incomplete evaluation of the prospect. Additionally, other key well construction aspects such as determining optimum mud weight required for borehole stability especially in deviated wells; optimum casing setting depth selection where the pore pressure profile below the shoe is known are highly dependent on accurate knowledge of the formation strength estimate. Historically, there have been several methods to predict fracture gradient, most and/or a combination of the methods have been adopted by many operating companies. Several operating companies have drilled so many wells in certain fields such that formation integrity test data (Leak-Off test and Limit tests) exist for the several formations that have been traversed by these wells. The industry has great reliance on the use of offset correlating wells data in well planning and designs. In this study, several Leak-Off (LOT) test data from different wells across fields in the Niger Delta were used to determine a correlation between increase in formation strength and depth. A practical statistical method is used to derive equations for fracture gradient estimation in Onshore and Swamp Niger Delta using existing wells leak off test database. Limited data for the shallow offshore were also used to derive an equation which has proven to work. These set of equations can be used to estimate fracture gradient expected in the formations across these and nearby fields. The formation leak-off gradient has been assumed to be an approximate representation of the formation strength or formation breakdown gradient. Since the latter is always greater, the use of the former for well design purposes provides an additional factor of safety." @default.
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• W2078755883 date "2014-08-05" @default.
• W2078755883 modified "2023-09-25" @default.
• W2078755883 title "Fracture Gradient Estimation in the Niger Delta – A Practical and Statistical Approach" @default.
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• W2078755883 doi "https://doi.org/10.2118/172481-ms" @default.
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