on at the bottom of th ostatic pore pressure nodels at 2250m:
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
![Q3) You are in charge of drilling operations in a sedimentary basin. The figure bellow
gives the setting. Prior to drilling you have performed a numerical analysis. The table
below states the necessary information at the bottom of the shale layer and at the top
of the sandstone layer. Assume hydrostatic pore pressure throughout the reservoir.
Stress results from your numerical models at 2250m:
To [MPa]
Rock layer Sy [MPa] S [MPa] S, [MPa] [deg] So [MPa]
Shale
Sandstone 55.2
55.2
65
40
30
20
10
0.25
30
25
30
10
5
0.25
planned wellpath
Shale thickness- 2250m
Sandstone: thidkness 250m
A. Your drilling crew on the rig wants to drill with a setting P-Po through the
shale. Will you approve this and give permission? Prove your decision by
calculating the necessary stresses and show a Mohr Circle construction so that
the driller can understand your reason. If unsafe, which borehole failure
mechanism do we expect? ;
B. Should they increase, decrease P, or stay with P=Po? Why?
C. Determine the save mud weight window to drill through the Sandstone
formation.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F795c6d1a-7635-44f8-9546-11f583ce0022%2F8f37ba57-769a-4625-855e-586e4f0c7c7e%2F7qr5lrx_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Q3) You are in charge of drilling operations in a sedimentary basin. The figure bellow
gives the setting. Prior to drilling you have performed a numerical analysis. The table
below states the necessary information at the bottom of the shale layer and at the top
of the sandstone layer. Assume hydrostatic pore pressure throughout the reservoir.
Stress results from your numerical models at 2250m:
To [MPa]
Rock layer Sy [MPa] S [MPa] S, [MPa] [deg] So [MPa]
Shale
Sandstone 55.2
55.2
65
40
30
20
10
0.25
30
25
30
10
5
0.25
planned wellpath
Shale thickness- 2250m
Sandstone: thidkness 250m
A. Your drilling crew on the rig wants to drill with a setting P-Po through the
shale. Will you approve this and give permission? Prove your decision by
calculating the necessary stresses and show a Mohr Circle construction so that
the driller can understand your reason. If unsafe, which borehole failure
mechanism do we expect? ;
B. Should they increase, decrease P, or stay with P=Po? Why?
C. Determine the save mud weight window to drill through the Sandstone
formation.
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