Patent ID: 8651188
Filing Date: 2014-02-18
Classification: E21B,Y10T

Abstract:
1. A gas lift valve, comprising: a longitudinally extending tubular body having an inlet and an outlet, a flow path extending between the inlet and the outlet; a flow tube located inside the body, the flow tube being translatable in the axial direction between at least a first and a second position wherein the flow tube comprises a first end, a second end and a blunt body located at the second end; a venturi flow restrictor that comprises a venturi orifice, the venturi flow restrictor located inside the body along the flow path and disposed at least partially within the flow tube via an opening of the first end of the flow tube; a seal part located proximate to the outlet of the body; a flapper connected with the body by way of a hinge part, the flapper having at least a first position being an open position and a second position being a closed position, the closed position being where the flapper contacts the seal part thereby closing the flow path and the open position being where the flapper does not contact the seal part and does not close the flow path, a transition from the closed position to the open position occurring in response to flow in the flow path impinging the blunt body to transfer force to the flow tube to contact the flapper and to force the flapper to the open position wherein where the flow tube is in its second position, the second end, the blunt body and a portion of the flow tube extends through an opening defined by the seal part, the portion shielding the seal part from flow along the flow path.