Case Study 1, Part 2

Using the information from Deep Water Horizon explosion and the PHL you constructed,

Part 1 Preliminary Hazard List (PHL) Table

Preliminary Hazard List (PHL)

Project: Deepwater HorizonDate: 8/19/2018

Prepared by:

Hazardous Event

Hazard Category




High pressure in the hole.


The small diameter of the hole.

Accumulation of explosive gasses

Widening of the hole

Inadequate cementing


Lack of a cementing evaluation log.

Reduction of cement quality down the casing

Use of an evaluation log.

Misinterpretation of the pressure tests


Lack of test assessment tools

Invalid and wrong conclusions

Employment of more than one tool for assessing the tests.

The rise of reservoir fluids and hydrocarbons at the rig floor


Lack of an efficient monitoring system

Ignition of reservoir fluids and associated gasses

Development of a good working monitoring system.

Now take the PHL you made in part 1 of this case study and construct a detailed Preliminary Hazard Analysis (PHA) on each item on your PHL. Realize that the PHA takes what your brainstorming session came up with in the PHL and gets a little more into the weeds with such things as causal factors, consequences, and relative risk. These are the things you should focus on in a one to two-page report to your boss. Use the Risk Assessment Matrix to quantify the risks you identify.

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