Questions? Call 800-624-6242

| Items in cart [0]

PAPERBACK
price:\$47.00

## Macondo Well Deepwater Horizon Blowout: Lessons for Improving Offshore Drilling Safety (2011) Marine Board (MB)Board on Environmental Studies and Toxicology (BEST)

### Citation Manager

. "Appendix D: Calculating the Differential Pressure at the Start of the Negative Test and the Quality of Foam Cement." Macondo Well Deepwater Horizon Blowout: Lessons for Improving Offshore Drilling Safety. Washington, DC: The National Academies Press, 2011.

Please select a format:

 Page 167

The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy.

Treatment for Posttraumatic Stress Disorder in Military and Veteran Populations:

Δp = po – pi

where

Δp = pressure differential [pounds per square inch (psi)];

po = pressure outside the casing at the bottom (psi), assumed equal to reservoir pressure of 11,892 psi, which is a pore pressure of 12.57 pounds per gallon (ppg) at the bottom of the reservoir at 18,212 feet (true vertical depth); and

pi = pressure on the inside above the cement (psi).

Here the differential is into the casing. The cement is treated as a solid that does not transmit hydrostatic pressure but that must be strong enough to withstand the pressure differential across it. The top of the cement inside the casing is based on the assumption that 2.8 barrels of foam cement flowed back into the casing when the pressure was bled off at the end of the cement job.

2. Foam quality calculations:

Foam cement: The purpose in this case is to reduce the bottom hole (in situ) density of the slurry from 16.74 ppg to 14.5 ppg. The bottom hole pressure is the hydrostatic pressure of 14 ppg mud or 13,321 pounds per square inch gauge (psig) at 18,304 feet. The static bottom hole temperature is 245°F.

where

 Page 167
 Front Matter (R1-R20) Macondo Well Deepwater Horizon Blowout (1-2) Summary (3-9) 1 Introduction (10-18) 2 Well Design and Construction (19-44) 3 Blowout Preventer System (45-74) 4 Mobile Offshore Drilling Units (75-89) 5 Industry Management of Offshore Drilling (90-110) 6 Regulatory Reform (111-127) 7 Concluding Comments (128-129) References (130-135) Appendix A: Statement of Task (136-137) Appendix B: Public Agendas of the Committee on the Analysis of Causes of the Deepwater Horizon Explosion, Fire, and Oil Spill to Identify Measures to Prevent Similar Accidents in the Future (138-141) Appendix C: Findings, Observations, and Recommendations (142-165) Appendix D: Calculating the Differential Pressure at the Start of the Negative Test and the Quality of Foam Cement (166-169) Study Committee Biographical Information (170-176)