petro hw #3 Essay

606 WordsMar 20, 20143 Pages
1. What is the first priority of a petroleum engineer? (5 points) The first priority of a petroleum engineer is safety. 2. What are the 5 elements of a petroleum system labeled on the illustration above? Green indicates hydrocarbon fill and E refers to the anticlinal structure. (10 points) A. Top Seal Rock (impermeable shale) B. Reservoir Rock (Porous sandstone) C. Source Rock (Organic-Rich shale) D. Potential migration route (Non-sealing fault) E. Anticlinal Trap 3. Name the four major disciplines of Petroleum Engineering. (4 points) Reservoir Engineering, Production Engineering, Petrophysics (Formation Evaluation), and Drilling. 4. What are the three main purposes of drilling fluid (mud)? (6 points)…show more content…
(10 points) There are clastics, nonclastics, and evaporites. Clastics include sandstone, which is a reservoir, and shale, which is a source, trap, and also a reservoir. An example of a nonclastic is carbonate, which is a reservoir. An example of an evaporite is salt, which is a trap. 10. The seismic reflection coefficient R for the interface between two layers of rock is given (approximately) by the following equation for normal incidence (sound raypaths hit the interface between two rock layers at a right angle), where ρ1 is the density of layer 1 (top), ρ2 is the density of layer 2 (bottom), v1 is the velocity of sound in layer 1 (top) and v2 is the velocity of sound in layer 2 (bottom): Calculate the reflection coefficient R if ρ1 = 2.1 gm/cm3, ρ2 = 2.2 gm/cm3, v1 = 1500 m/s, and v2 = 2000 m/s. (5 points) The reflection coefficient is 0.17 11. Why do Petroleum Engineers care about Plate Tectonics? (4 points) It tells them about the creation of structures and basins. It also helps them identify places where there are potential reservoirs or source rocks. 12. Flow from a pressured “zone” (interval of porous rock) encountered while drilling is controlled when the mud weight in the wellbore provides a pressure that equals or exceeds the pressure of the zone. There is a pressured zone at 8000psi penetrated while drilling at 15,000ft

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