发明名称 |
SYSTEMS AND METHODS FOR IMPROVING DRILLING EFFICIENCY |
摘要 |
A method for drilling a borehole in an earthen formation comprises (a) providing a drilling system including a drillstring having a longitudinal axis, a bottom-hole assembly coupled to a lower end of the drillstring, and a drill bit coupled to a lower end of the bottom-hole assembly. In addition, the method comprises (b) rotating the drill bit at a rotational speed. Further, the method comprises (c) applying weight-on-bit to the drill bit and advancing the drill bit through the formation to form the borehole. Still further, the method comprises (d) pumping a drilling fluid down the drillstring to the drill bit. The drilling fluid has a flow rate down the drillstring. Moreover, the method comprises (e) oscillating the rotational speed of the drill bit during (c). The method also comprises (f) generating non-steady state conditions in the borehole during (e). |
申请公布号 |
EP2480744(A2) |
申请公布日期 |
2012.08.01 |
申请号 |
EP20100818003 |
申请日期 |
2010.09.21 |
申请人 |
NATIONAL OILWELL VARCO, L.P. |
发明人 |
MEBANE III, ROBERT, EUGENE;FLORENCE, FREDERICK, RAY |
分类号 |
E21B6/06;E21B3/00;E21B44/00 |
主分类号 |
E21B6/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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