连续循环钻柱外文翻译
23页1、 本科毕业论文(翻译)英文标题Continuous circulation drillingsystem学生姓名学号教学院系专业年级指导教师职称单位辅导教师职 称单位完成日期 2013年04月 Continuous Circulation Drill String SubAbstract There is an increasing need to drill difficult reservoirs in a cost effective way. Over the past few years Managed Pressure Drilling (MPD) has made it possible to drill reservoirs which have a narrow window between pore and fracture pressure gradients. Before the introduction of MPD techniques, safely drilling and completing these formations was very co
2、stly and not always successful. Cycling the mud pumps off and on for connections affects the pressure and is a major problem for MPD.Techniques and equipment have been developed to make a connection while continuing to circulate the drilling mud to maintain constant pressure. Since 2005, the Continuous Circulation System (CCS) has allowed continuous circulation during connections with traditional jointed drill pipe, by using a chamber around the connection. Several companies have developed conti
3、nuous circulation subs which are threaded between tool joints to achieve continuous circulation without a pressure chamber. These have had varying degrees of success from both an operational and safety standpoint. This paper describes the current MPD market and describes the philosophy adopted for a new side-entry sub.IntroductionHistory was made in July of 2003, when the first continuous circulation chamber was tested in prototype form on a land rig. Jointed drill pipe was separated inside a se
4、aled chamber, which was filled with drilling fluids provided by the mud pumps. The drill string was separated, another joint added, and drilling continued without ever shutting down the mud pumps. After its introduction in 2005, many operators have begun using the continuous circulation chamber as a way to drill un-drillable wells, specifically those having “tight” pore pressure and fracture pressure windows. This means that the bottom-hole pressure must be very closely controlled at all times (
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