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Unformatted text preview: flow after conversion. The float collar dual flapper arrangement is designed to close after the cement is in place (and starts setting up) to prevent any flow‐back into the casing (and up the well) caused by hydrostatic pressure differences between the dense cement and drilling mud on the outside of the casing and the less dense displacement fluid on the inside. The float collar also acts as the landing point for the cementing plugs used during the job. The float collar employed a differential fill tube that allowed mud to flow into the casing as it was run into the well. The fill tube in this case was designed to be pumped out of the float collar if the pump rate was higher than five barrels per minute. The position of the top of the float collar located at 18,115 feet placed the float collar across the productive reservoir between 18,083 feet and 18,206 feet measured depth. As described above, the crew had difficulty converting the float collar and may not have achieved conversion despite making nine attempts. There are three possible reasons for the failure of the float collar: (1) the high load con...
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This note was uploaded on 01/18/2014 for the course BEPP 305 taught by Professor Nini during the Fall '11 term at UPenn.

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