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%2010.pdf. 90 BP‐HZN‐MBI0023746. “Top of cement” is the depth in the well where the cement that has already been set in the well ends. 91 30 CFR § 250.421. 89 41 Halliburton pumped a total of 51 bbls of cement for the production casing cement job, consisting of 5.26 bbls of lead cement, 38.9 bbls (47.74 bbls when foamed) of foamed cement, and 6.93 bbls of tail cement. 92 BP did not plan to pump cement above the top wiper plug in order to preserve the ability to run a cement evaluation log (discussed below), if necessary. Cement above the wiper plug would have provided an additional barrier to hydrocarbon flow. 2.
Pump Time and Rate BP planned to pump the cement into the well at a relatively low rate of four barrels a minute in order to reduce pressure on the formation that could result in lost returns. This strategy carried risks since a higher pumping rate generally would have increased the likelihood that cement would displace mud from the annulus and thereby would have increased the likelihood of a successful cement job. BP was aware that it was using a low pump rate, so it wanted to be able to maximize the amount of time it could run the pump without the cement setting up or fracturing the...
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