Abstract
"Application of Interval Seismic Velocities for PreDrill Pore Pressure Prediction and Well Design in Belayim Land Oil Field, Gulf of Suez, Egypt"
Highlights
A pre-drill pore pressure prediction is one of the basics for well design and the planning of well-drilling and represent a key to safe drilling and avoid drilling problems and well control operations
This study carried out on eight wells are spread across Belayim Land oil field (112-100, 112-119, 113-16, 113-60, 113-95, 113-112, 113-124 and 113-A-21) where the aims of this part to present the results of pore pressure prediction using interval seismic velocity and report any indication of anomaly present in pore pressure prediction and determine mud weight to every interval
Pre-drill pore pressure prediction for 113-60 well shows in Figure 21 An NCT was generated where pore pressure prediction trend shows that this well is expected to be normal to +/- 2020m TVDss, this will be followed by a reversal decrease in pore pressure behavior reaching a value of 7.75ppg EMW inside Belayim Formation, where Kareem Formation show that the maximum pore pressure predicted was 7.9ppg EMW while pore pressure prediction trend in Rudies Formation show that the maximum value was 7.8ppg EMW
Summary
A pre-drill pore pressure prediction is one of the basics for well design and the planning of well-drilling and represent a key to safe drilling and avoid drilling problems and well control operations. First we should throw light on the basic and typical terminologies used in subsurface formation pressure. The hydrostatic pressure is the pressure exerted by the static column of fluid at a reference depth. It is dependent on the density of the formation fluid, usually water or brine, and the true vertical height of the column of fluid. The overburden pressure is the pressure exerted at a particular depth by the weight of overlying sediments including the fluid it contains. Formation pore pressure is the pressure which formed by the fluids (formation Water, Oil, Gas) in the pore spaces of the formation. Normal formation pressure is the state where the hydrostatic column of water equal to the subsurface formation pressure
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