Isolation valve with debris control and flow tube protection

摘要

The present invention generally relates to an isolation valve with debris control. In one aspect, an isolation valve for use as part of a casing string is provided. The isolation valve includes a housing having a bore and a valve cavity. The isolation valve further includes a valve member movable between a first position in which the valve member obstructs the bore of the housing and a second position in which the valve member is disposed in the valve cavity. Further, the isolation valve includes a flow tube configured to allow movement of the valve member between the first and second positions. Additionally, the isolation valve includes an engagement assembly adapted to engage the flow tube to substantially prevent debris from entering the valve cavity when the valve member is in the second position. In another aspect, a method of operating an isolation valve in a wellbore is provided.

主权项

1. An isolation valve for use as part of a casing string, the isolation valve comprising:
a housing having a bore, a valve cavity, and a seat; a flapper movable between a first position in which the flapper obstructs the housing bore by engaging the seat and a second position in which the flapper is disposed in the valve cavity; a flow tube configured to allow movement of the flapper between the first and second positions; and a hinge arrangement having a first portion connected to the flapper, a second portion directly fastened to the housing by one or more connection members with freedom for a small alignment movement, and an adjustment locking connection member directly attached to the housing by a thread connection and configured to lock the second portion to the housing after the alignment movement.