发明名称 |
ROTATING CONTROL DEVICE |
摘要 |
A drilling system, rotating control device, and a method for accessing a wellbore may employ a rotating control device arranged to form a dynamic seal between the housing and an exterior of the string to isolate the wellbore annulus under both a positive and a negative differential pressure across the seal. The rotating control device may including a sleeve rotatively disposed within the housing and rotatively carried near a longitudinal midpoint of the sleeve by a thrust bearing assembly. One or more seal retainers may be coupled to and sealed against the sleeve, each including a resilient element disposed to slide to a first sealing position within the seal retainer under a positive differential pressure across the element and to slide to a second sealing position within the seal retainer under a negative differential pressure across the element. |
申请公布号 |
WO2016028340(A1) |
申请公布日期 |
2016.02.25 |
申请号 |
WO2015US16001 |
申请日期 |
2015.02.16 |
申请人 |
HALLIBURTON ENERGY SERVICES INC. |
发明人 |
LEWIS, DERRICK W.;GRACE, CHRIS A. |
分类号 |
E21B33/035;E21B33/076;E21B44/00 |
主分类号 |
E21B33/035 |
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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