Electrical controller for Anti-stall tools for downhole drilling assemblies
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Specifications for One Embodiment AST Illustrated in FIGS. 6-8
[0076]
DescriptionCharacteristicTool OD3.00inTool ID.75inLength - Expanded8.1ftLength - Collapsed7.4ftStroke9inMax Temp300°F.Tensile Strength50,000lbsMax Motor Torque2,000ft-lbsMax Dog Leg25° / 100ftTool Joint2⅜PAC
[0077]The design of an electrically controlled AST is flexible in that the pressure settings may be changed to fine tune the AST. Programmable pressure settings may be changed on surface or while in operation. Current available communication techniques include mud pulse telemetry, fiber optic and wireline.
[0078]If a large increase in WOB is needed, then the shaft of the AST can be replaced to allow the installation of additional pistons.
Total DownholePressure ControlMax WOB from# of PistonArea (sq. in)Valve Setting (psi)AST (lbs)14.86503,05527.96505,135311.06507,150
[0079]Features and Benefits:
The following illustrates features of an electrically controlled AST:
[0080]Active WOB: The tool will attempt reset into the ...
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