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Drilling In The Petroleum Industry

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The petroleum industry has begun to shift into more challenging circumstances in which to drill, complete, and produce hydrocarbons from the well which has largely been due to depletion of conventional reserves present onshore overtime. In the U.S., the industry has particularly seen a gradual shift to development of unconventional shale plays, including the Eagle Ford or Bakken formations, and deepwater assets which are flanked by salt deposits. In the latter operating circumstances, which will be focused on in this paper, the window in which safe drilling can be maintained is significantly reduced. This is due to both the reduced fracture gradient in shallower deepwater formations as relatively higher This template is provided to give …show more content…

Once a gas kick enters the well, the conventional procedures to remove this hazard from the wellbore would be to shut-in the well and to use an adjustable choke at the surface, maintaining constant bottom hole pressure while remaining above or exceeding the formation pressures. Furthermore, if gas has entered into the marine risers offshore, the flow of gas through the slender choke lines could rapidly increase the migration of the gas to the rig and endanger personnel & equipment. Conventionally, the mud & gas solution has been diverted away from the rig in past scenarios in which potential blowouts could occur. In the past, operators have considered increasing the density of the mud to kill weight mud (KWM) and minimizing the shut-in time to be detrimental to the well due to increasing the chances of underground blowout. As will be seen, this is certainly not the case and the major point of focus, as will be focused on throughout this paper, should alternatively be to develop a proactive approach to mitigate gas kicks. Analyzing the bubble-rise velocity of the gas kick in the annulus, and the multiple parameters that affect it, could potentially result in successfully mitigating problems due to kicks in the annulus. Underbalanced drilling refers to a scenario in which the

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