Advanced Drilling Engineering Group Project

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.

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

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