Pore Pressure and Fracture Gradientassessment from Well Log Petrophysical Data of Agbada Formation, South-East Niger-Delta

Rotimi, Oluwatosin J. and Adeoye, TaiyeOlushola and Ologe, Oluwatoyin and Onuh, C.Y (2015) Pore Pressure and Fracture Gradientassessment from Well Log Petrophysical Data of Agbada Formation, South-East Niger-Delta. American Journal of Scientific Research (105). pp. 47-61. ISSN ISSN 2301-2005

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Abstract

Changing down-hole conditions observed during hydrocarbon exploration can be divers. Some desired ones concern oil/gas shows while others may vary from borehole/drilling fluid association and pressure situations. Managing pressure variations and geopressure zones while drilling has been an issue of concern which has yield generic positive results over the years. However pre-pressure zones (i.e. zones above pressure zones), can display characteristics that are worthy of note in view of the underlying rock potential. Pore pressure and fracture pressure has been evaluated using Eaton’s equations amongst others on data for some reservoir of Agbada formation in the petroliferous Niger Delta. This is in view of knowing the potential of this pre-pressured zone with effective porosity and water saturation necessitated by production operations and well re-entry processes. These computations adopted various pressure models and have yielded good result presented as plots. It was observed that depth of rock units is the main indicator of rock shrinkage leading to increase in fracture due to increase in production and hydraulic fracturing. Adequate attention must be paid to the integrity (density) of the explored formation as they become sandwiched with under-compacted argillaceous sediments.

Item Type:	Article
Uncontrolled Keywords:	drilling, pressure, pre-pressure, fracture, shrinkage, porosity, pore pressure
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) T Technology > TP Chemical technology
Divisions:	Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User:	Mrs Patricia Nwokealisi
Date Deposited:	16 Nov 2017 12:43
Last Modified:	16 Nov 2017 12:43
URI:	http://eprints.covenantuniversity.edu.ng/id/eprint/9677

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