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Advanced Drilling Engineering Group Project

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Advanced Drilling Engineering Group Project

Part 1: Pore Pressure & Fracture Pressure Estimation

Table 1 shows the average bulk densities for a Miocene in the Tucano Region, Northeast Brazil. Assume an average matrix density of 2.60 g/cm3. The normal pore pressure is 0.452 psi/ft. Table 2 shows the interval-transit times for a prospect in the region. Figure 1 shows the assumed Poisson's ratio for the region.

  • Determine an expression for the surface porosity (0) and the porosity decline coefficient (K).
  • Determine the top of the transition zone.
  • Determine the pore pressure curve using the equivalent matrix stress method. The average interval-transit time in the pore fluid is 210 s/ft. Use a margin of 0.8 lb/gal for the pore pressure gradient. Plot the resulting pore pressure gradient versus Depth (put Depth in the vertical axis, pointing downwards).
  • Determine the formation fracture pressure curve using Ben Eaton's model (model presented in the course). Obtain Poisson’s ration from the graph in Figure 1 and overburden equal to 1.0 psi/ft on shales. Use a margin of 1.0 lb/gal for the formation fracture pressure gradient. Plot the resulting on the same graph of the item (3).

Depth Bulk Dens. ft g/cm³

 

                                                                        0                             2.046

                                                                    1000                          2.143

                                                                    2000                          2.233

                                                                    3000                          2.300

                                                                    4000                          2.353

                                                                    5000                          2.392

                                                                    6000                          2.430

                                                                    7000                          2.460

                                                                    8000                          2.482

                                                                    9000                          2.497

                                                                   10000                        2.510

                                                                   11000                         2.522

                                                                   12000                         2.533

                                                                   13000                         2.543

                                                                   14000                         2.552

                                                                   15000                         2.560

                                                                   16000                         2.567

                                                                   17000                         2.573

                                                                   18000                         2.578

                                                                   19000                         2.582

                                                                   20000                         2.585

                                                                   21000                         2.587

                                                                   22000                         2.588


Table 1: Composite bulk-density

for the Tucano Region.

4000 to 5000

98

5000 to 6000

93

6000 to 7000

86

7000 to 8000

84

8000 to 9000

84

9000 to 10000

78

10000 to 11000

75

11000 to 12000

80

12000 to 13000

81

13000 to 14000

84

14000 to 15000

86

15000 to 16000

95

16000 to 18000

95

18000 to 20000

95

20000 to 21000

93

21000 to 22000

93

Table 2: Average interval-transit time for the Tucano Region.

Poisson's ratio for the Tucano region

Figure 1: Poisson's ratio for the Tucano region (assume overburden of 1psi/ft in shales).

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