초록 ▼

A single ram unidirectional wireline BOP system is provided having both mechanical and hydraulic sealing capability. A BOP body having a vertical flow passage and intersecting horizontal ram passages includes a single pair of opposed rams and appropriate actuators for moving the rams into sealing en

A single ram unidirectional wireline BOP system is provided having both mechanical and hydraulic sealing capability. A BOP body having a vertical flow passage and intersecting horizontal ram passages includes a single pair of opposed rams and appropriate actuators for moving the rams into sealing engagement with a wireline extending through the vertical flow passages. Each of the rams incorporates an elastomeric peripheral seal extending about a major portion of the periphery thereof and disposed for sealing engagement with internal wall surfaces of the body. The sealing system of the rams also incorporates a pair of vertically spaced inner elastomeric seals disposed for sealing engagement with one another and with the wireline. Between the upper and lower inner seals in the closed positions of the rams, is defined a small, centralized grease chamber through which the wireline extends. The body of the BOP incorporates a grease fitting for injection of grease into the grease chamber for hydraulic sealing about the wireline. Both the rams incorporate a relief valve controlled pressure relief system for relieving excess grease pressure to the upstream portion of the flow passage of the BOP. The BOP also incorporates a valve controlled pressure equalizing system to permit selective pressure equalization across the seals developed by the upper and lower inner sealing elements to thus reduce pressure energized frictional forces and permit the rams to be easily moved from the closed position towards the open positions thereof.

대표청구항 ▼

A single ram unidirectional wireline BOP system having mechanical and hydraulic sealing capability with respect to a wireline that is movable therethrough and which forms interstices between armor strands thereof, comprising: (a) a BOP body having a vertical flow passage and forming a pair of oppose

A single ram unidirectional wireline BOP system having mechanical and hydraulic sealing capability with respect to a wireline that is movable therethrough and which forms interstices between armor strands thereof, comprising: (a) a BOP body having a vertical flow passage and forming a pair of opposed horizontal ram passages; (b) a pair of rams being movably disposed within said ram passages, each of said rams forming a face surface and having an elastomeric outer seal establishing an outer peripheral seal between said rams and said BOP body and a pair of vertically spaced elastomeric inner sealing elements projecting beyond said face surface and adapted for sealing engagement with one another and with the wireline, said rams being movable to open positions wherein said inner sealing elements are positioned away from said wireline and closed positions where said face surfaces of said rams are disposed in spaced relation with one another and said inner sealing elements of said rams establish mechanical sealing engagement with said wireline, in said closed positions of said rams the space between said vertically spaced elastomeric inner sealing elements and the space between said face surfaces of said rams forming a grease sealant chamber through which said wireline extends; (c) means imparting movement of said rams to said open and closed positions; and (d) means for conducting injected grease sealant into said grease sealant chamber at sufficiently high pressure to establish hydraulic sealing with said wireline in said grease sealant chamber to prevent leakage of fluid pressure through said interstices of said wireline.