Browsing by Subject "extended-reach"
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Item Well control procedures for extended reach wells(Texas A&M University, 2004-09-30) Gjorv, BjornThe limits of directional drilling continue to be pushed back as horizontal or near-horizontal reservoir sections are being drilled, cased, cemented and completed to tap reserves at extreme distances. Continuous development of new technology and adopting a technical-limit approach to performance delivery are key elements for the success and further development of extended-reach drilling projects. For this study a two-phase well control simulator was used to evaluate different kick scenarios that are likely to occur in extended-reach wells. An extensive simulation study covering a vide range of variables has been performed. Based on this investigation together with a literature review, well-control procedures have been developed for extended-reach wells. The most important procedures are as follows: Perform a "hard" shut-in when a kick is detected and confirmed. Record the pressures and pit gain, and start to circulate immediately using the Driller's Method. Start circulating with a high kill rate to remove the gas from the horizontal section. Slow down the kill circulation rate to 1/2 to 1/3 of normal drilling rate when the choke pressure starts to increase rapidly. The simulator has been used to validate the procedures.