Wireline blowout preventer having mechanical and hydraulic sealing

Patent · Tue Jul 03 04:00:00 EDT 1990

OSTI ID:6830954

Leggett, H H; Gingras, L M

This patent describes 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. It comprises: a BOP body having a vertical flow passage and forming a pair of opposed horizontal ram passages; a pair of rams being movably disposed within the ram passages, each of the rams forming a face surface and having an elastomeric outer seal establishing an outer peripheral seal between the rams and the BOP body and a pair of vertically spaced elastomeric inner sealing elements projecting beyond the face surface and adapted for sealing engagement with one another and with the wireline. The rams are movable to open positions wherein the inner sealing elements are positioned away from the wireline and closed positions where the face surfaces of the rams are disposed in spaced relation with one another and the inner sealing elements of the rams establish mechanical sealing engagement with the wireline, in the closed positions of the rams the space between the vertically spaced elastomeric inner sealing elements and the space between the face surfaces of the rams forming a grease sealant chamber through which the wireline extends; means imparting movement of the rams to the open and closed positions; and means for conducting injected grease sealant into the grease sealant chamber at sufficiently high pressure to establish hydraulic sealing with the wireline in the grease sealant chamber to prevent leakage of fluid pressure through the interstices of the wireline.

• Assignee: Eastern Oil Tools PTE LTD (USA)
• Patent Number(s): US 4938290; A
• Application Number: PPN: US s 7-367782
• OSTI ID: 6830954
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
BLOWOUT PREVENTERS
DESIGN
NATURAL GAS WELLS
OIL WELLS
SEALS
WELLS