Invention Grant
- Patent Title: Linear motor to pre-bias shuttle force
- Patent Title (中): 线性电机预偏置穿梭力
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Application No.: US11959970Application Date: 2007-12-19
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Publication No.: US07699071B2Publication Date: 2010-04-20
- Inventor: Alan Wayne Burkhard , Nicolas Christopher Wade Thiessen
- Applicant: Alan Wayne Burkhard , Nicolas Christopher Wade Thiessen
- Applicant Address: US TX Houston
- Assignee: M-I L.L.C.
- Current Assignee: M-I L.L.C.
- Current Assignee Address: US TX Houston
- Agency: Osha Liang LLP
- Main IPC: F16K31/12
- IPC: F16K31/12

Abstract:
A method of controlling one or more operating pressures within a subterranean borehole that includes a choke assembly is disclosed. The choke assembly may include a housing having an inlet passage, an axial bore, and a chamber, wherein a portion of the axial bore forms an outlet passage, and a choke member adapted for movement in the housing to control the flow of a fluid from the inlet passage to the outlet passage. The method may include applying a closing force to move the choke member toward a closed position, and applying a bias force to the choke member when in the closed position to reduce an overpressure required to initiate movement of the choke member from the closed position.
Public/Granted literature
- US20080149391A1 LINEAR MOTOR TO PRE-BIAS SHUTTLE FORCE Public/Granted day:2008-06-26
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