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Controlling a fluid well

a technology for controlling fluid wells and fluid wells, applied in the direction of wellbore/well accessories, fluid removal, survey, etc., can solve the problems of limited protection and the situation becoming much more serious

Inactive Publication Date: 2005-06-09
VETCO GRAY CONTROLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017] ii) the first switching means includes means for routing control signals from the first control channel to control the first drive means and the second switching means includes means for routing control signals from the second control channel to control the second drive means, the first a

Problems solved by technology

However, these techniques only provide a limited protection against failure, with the situation becoming much more serious when a plurality of fluid control chokes are fitted to a well, as is the trend in modern wells.

Method used

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  • Controlling a fluid well
  • Controlling a fluid well
  • Controlling a fluid well

Examples

Experimental program
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Embodiment Construction

[0024]FIG. 1 shows, diagrammatically, a known form of drive assembly for a fluid control device, typically a choke, mounted downhole in a hydrocarbon extraction well. The output of the drive is a shaft 1 with a linear motion which operates the fluid control device D, typically a choke having a sliding slotted sleeve that controls fluid flow. The linear action of the shaft 1 is derived from the rotary motion of a motor via a screw arrangement. The assembly (as in GB 2350659) has two motors 2 and 3 coupled with a mechanism 4, that provides the required linear output from the shaft 1 from either motor. The two motors provide greater availability in the event of the failure of one of them and are controlled and powered via separate feeds from a control system at a surface platform to the well. In the example shown, motor 2 is electric and motor 3 is hydraulic, thus continuing to provide availability in the case of failure of either the electric or hydraulic power sources or their feeds....

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PUM

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Abstract

In apparatus for controlling a fluid production well, a control device D, such as a choke, located downhole is operable selectively by first and second drive means (2,3). First and second power supply means and first and second control channels (ChA, ChB) for control signals are provided for the first and second drive means, the arrangement being such that if one of the power supplies fails, the respective drive means is operable via the other power supply. First and second means (DEM 1A, DEM 1B) for routing control signals from the first and second channels respectively to the first and second drive means are provided, the routing means being interconnected so that, in the event of a fault, control signals from the second channel are routed via the first routing means to the second drive means and / or control signals from the first channel are routed via the second routing means to the first drive means.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001] This application claims the benefit of United Kingdom Patent Application No. 0328440.3, filed on Dec. 9, 2003, which hereby is incorporated by reference in its entirety. TECHNICAL FIELD OF THE INVENTION [0002] The present invention relates to controlling a fluid well, such as a hydrocarbon extraction well. BACKGROUND OF THE INVENTION [0003] Subsea hydrocarbon extraction wells are controlled, typically, by hydraulically powered valves and fluid control chokes, downhole, with the control of the hydraulic power to such devices being effected by directional control valves (DCVs) which are electrically operated. The DCVs are typically housed in a control pod mounted on a well tree located on the sea bed above the well production tubing. The DCVs are, in turn, controlled by electronics, housed in a subsea electronics module (SEM) located in the control pod. The SEM is supplied with both electric power and control signals via an umbilical from ...

Claims

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Application Information

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IPC IPC(8): E21B34/06E21B34/10E21B43/12E21B47/12
CPCE21B34/06E21B47/12E21B43/12E21B33/0355
Inventor DOUGLAS, NEILASSKILDT, KNUTYAGHMAI, SOHRABJOHANNESSEN, SVEIN
Owner VETCO GRAY CONTROLS