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Unformatted text preview: PGE 430 Drilling Homework 5 Due at lecture time: Oct. 14th (1) Please construct an Excel plot of depth versus resistivity for the attached data set. Please construct a trend line on the graph that intersects the data points of (1000’ and 2 ohmm) and (6000’ and 6.4 ohmm). Indicate on your plot where the top of the over pressured transition region begins. Graph is worth +2 and point and top of transition is worth +1 (total of +3) Shale Resistivity 1000 2000 3000 4000 5000 6000 7000 8000 9000 2 4 6 8 10 Resistivity (ohmm) Well Depth from KB (ft) top of transition (2) Determine the slope and intercept of the trend line given to you in part (1). Use the resulting equation of the line to predict the resistivity associated with “normal” pore pressure. Show a column of your spread sheet for the predicted pore pressure if the proportionality constant exponent for resistivity is 1.2 as shown in the notes. The equation of the correlating line is ( 29 1136.36 1272.72 D R = Equation of the line (or slope and intercept) is worth +0.5 Spread sheet pore pressure column is worth +1.5 Well Depth Resistivity Trend C Pore P from sea level ohmm^2/m Resistivity (psi) 100 44.166 500 1.560 231.655 900 1.5 1.912 0.74735 416.979 1000 3 2.000 1.626708 463.31 1100 2 2.088 0.949641 509.641 1200 2.5 2.176 1.181238 555.972555....
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This note was uploaded on 02/13/2012 for the course PGE 430 taught by Professor Chenevert during the Spring '06 term at University of Texas.
 Spring '06
 Chenevert

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