| 摘要 |
A system comprising a control valve comprising a flapper either activated or inactivated, when activated the flapper may be closed or open and, when inactivated the flapper is open, a first sleeve transitional from a first to a second position, and a second sleeve transitional from a first to a second position, when the first and second sleeves are in the first position, the flapper is activated, when the first sleeve is in the second and the second sleeve is in the first position, the flapper is inactivated, when the first and second sleeves are in the second position, the flapper is activated, the application of pressure to the first sleeve via a first member transitions the first sleeve from the first to the second position, and the application of pressure to the second sleeve via a second member transitions the second sleeve from the first to the second position. |
| 主权项 |
1. A pressure control valve tool (PCVT) adapted to be incorporated within a work string and configurable between first, second, and third configurations, the PCVT comprising:
a housing generally defining an axial flowbore and a lower contact surface extending circumferentially about the axial flowbore; a first sleeve slidably positioned within the housing and moveable in an axial direction, and relative to the housing, from a first position to a second position; a second sleeve slidably positioned within the first sleeve and moveable in the axial direction, and relative to the first sleeve, from a first position to a second position; a flapper valve disposed within the axial flowbore and configurable between an activated state and an inactivated state, wherein, in the activated state, the flapper valve is free to move between a closed position, in which the flapper valve blocks the axial flowbore, and an open position, in which the flapper valve does not block the axial flowbore, and wherein, in the inactivated state, the flapper valve is retained in the open position by the second sleeve; and a body to which the flapper valve is hinged, the body comprising an upper contact surface extending circumferentially about the axial flowbore; wherein, when the PCVT is in the first configuration, the first sleeve is in the first position relative to the housing, the second sleeve is in the first position relative to the first sleeve, and the flapper valve is in the activated state; wherein, when the PCVT is in the second configuration, the first sleeve is in the second position relative to the housing and engaged with the upper contact surface, the second sleeve is in the first position relative to the first sleeve, and the flapper valve is in the inactivated state; wherein, when the PCVT is in the third configuration, the first sleeve is in the second position relative to the housing, the second sleeve is in the second position relative to the first sleeve and engaged with the lower contact surface, and the flapper valve is in the activated state; wherein engagement of a first obturating member with the first sleeve and application of at least a threshold pressure onto the first obturating member causes the PCVT to transition from the first configuration to the second configuration; and wherein engagement of a second obturating member with the second sleeve and application of at least a threshold pressure onto the second obturating member causes the PCVT to transition from the second configuration to the third configuration. |
