The lack of a strong safety culture resulting from a defi-cient overall systems approach to safety is evident in the multiple flawed decisions that led to the blowout. The video depicts how high-pressure oil and gas from the Macondo well in the Gulf of Mexico caused an explosion on the drilling rig that killed 11 workers and seriously injured 17 others. The Bureau of Safety and Environmental Enforcement (BSEE) of the U.S. Department of the Interior and other regulators should identify and enforce safety-critical points during well construction and abandonment that warrant explicit regulatory review and approval before operations can proceed. Corporations should investigate all such reports and disseminate their lessons-learned findings in a timely manner to all their operating and decision-making personnel and to the industry as a whole.


A Horner plot analysis (With the availability of additional shut-in pressure data every 24 h, the reservoir model was revised on a near real-time basis by adjusting the width and length of the reservoir channel and the location of the Macondo Well to improve the fit between simulated and observed shut-in pressures. All primary cemented barriers to flow should be tested to verify quality, quantity, and location of cement.

It was estimated that a minimum of 3 cmp or ∼120 ft (37 m) horizontally were needed to detect and interpret an anomaly.Using a horizontal detection threshold of 150 ft (46 m), which is slightly greater than 3 cmp, the WIT calculated the minimum volume of leaked hydrocarbons that could be imaged with seismic reflection. the human rights of migrants with the security concerns of host populations. Nonetheless, the drilling team determined mistakenly that the cementing operation had been completed successfully and proceeded to conduct a negative pressure test to establish the integrity of the cemented production casing. They are discussed in subsequent chapters of this report, along with more detailed findings, observations, and recommendations.It is the committee’s assessment that the following findings of facts have been established by the available evidence.1. The regulatory regime was ineffective in addressing the risks of the Macondo well. The blind shear ram failed to sever the drill pipe and seal the well properly, and the emergency disconnect system failed to separate the lower marine riser and the 5. The CSB today released a narrated computer animation recreating the Deepwater Horizon blowout on April 20, 2010. The flow continued for nearly 3 months before the well could be completely killed, during which time, nearly 5 million barrels of oil spilled into the gulf.You're looking at OpenBook, NAP.edu's online reading room since 1999. Numerous seismic images taken from these data were examined to assess (Interbedded sandstones and shales, if sufficient in volume and lateral extent, can inhibit or arrest vertical hydraulic fracture growth through associated stress contrasts, low-strength interfaces, or fluid leak-off into the high-permeability sands (To evaluate the risks of an underground blowout and possible seafloor broach, the WIT recommended that BP be allowed to shut the Macondo Well in for a limited-duration well integrity test.

The shut-in procedure consisted of a series of valve turns separated by 10-min rest periods to reduce the oil discharge rate to zero in a stepwise fashion. The reservoir permeability and the formation compressibility were also adjusted, but these measurements remained within ranges typical of reservoir sands. The explosion killed 11 crew members and set off the worst oil spill in U.S. history. Several hours after the final turn of the valve was completed and the well was fully shut in, the pressure in the capping stack rose to about 6,600 psi (46 MPa) (Wellhead pressure measured during and immediately after closure of the capping stack on the Macondo Well on July 15, 2010 as measured by pressure gauges installed on the capping stack (PT_3K_1 and PT_3K_2).

The United States should fully implement a hybrid regulatory system that incorporates a limited number of prescriptive elements into a proactive, goal-oriented risk management system for health, safety, and the environment. At the same depth, the horizontal resolution (as given by the Fresnel zone after migration) is 39 ft (12 m), which is one common midpoint (cmp) in this data. Eastern Energy Resources Science Center, US Geological SurveyCentral Energy Resources Science Center, US Geological SurveyApplications of science and engineering to quantify and control the Mechanisms for generating overpressure in sedimentary basins: a reevaluationOffshore sediment overpressures of passive margins: Mechanisms, measurement, and modelsBlack Tide: The Santa Barbara Oil Spill and Its ConsequencesPresent-day stress orientation in Brunei: A snapshot of prograding tectonics in a Tertiary deltaDramatic incidents during drilling at Wairakei Geothermal field, New ZealandDiscussion—Sawalo et al.

Online ISSN 1091-6490Enter multiple addresses on separate lines or separate them with commas.This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.Analysis of bone structure in fossils from South Africa suggests evidence of diverse modes of locomotion in ancient hominins. (3.


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