Importance

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Abstract

An impact driven oil and gas well tool for use with an elongated tubular string having a central flow conveying bore is provided for channeling pressurized fluid to the tool body. The apparatus further includes an elongated longitudinally extending tool body having a connecting end portion at its upper end for connecting the tool body to the pipe string. A fluid chamber in the tool body is provided that is in fluid communication with the pipe string bore. A stem is reciprocally movable within the tool body in a telescoping fashion. The stem includes a lower end portion for carrying a working member such as a drill. A pressure responsive valve is provided for controlling relative movement of the stem and the tool body. An anti-chatter annular sleeve is positioned in the fluid chamber and about the valve member. A spring extends between the sleeve and the valve member for holding the valve member off the seat until a predetermined flow rate through the tool body is reached.

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First Claim