Insert tree completion system

Journal Article · Wed Sep 01 04:00:00 EDT 1982 · J. Pet. Technol.; (United States)

DOI:https://doi.org/10.2118/11282-PA· OSTI ID:6473802

Brands, K W; Ball, I G; Cegielski, E J; Gresham, J S; Saunders, D N

This paper outlines the overall project for development and installation of a low-profile, caisson-installed subsea Christmas tree. After various design studies and laboratory and field tests of key components, a system for installation inside a 30-in. conductor was ordered in July 1978 from Cameron Iron Works Inc. The system is designed to have all critical-pressure-containing components below the mudline and, with the reduced profile (height) above seabed, provides for improved safety of satellite underwater wells from damage by anchors, trawl boards, and even icebergs. In addition to the innovative nature of the tree design, the completion includes improved 3 1/2-in. through flowline (TFL) pumpdown completion equipment with deep set safety valves and a dual detachable packer head for simplified workover capability. The all-hydraulic control system incorporates a new design of sequencing valve for both Christmas tree control and remote flowline connection. A semisubmersible drilling rig was used to initiate the first end flowline connection at the wellhead for subsequent tie-in to the prelaid, surface-towed, all-welded subsea pipeline bundle.

• Research Organization: Shell Intl. Petroleum Maatschappij B.V.
• OSTI ID: 6473802
• Journal Information: J. Pet. Technol.; (United States), Journal Name: J. Pet. Technol.; (United States) Vol. 34:9; ISSN JPTJA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
CONTROL EQUIPMENT
DIMENSIONS
DRILLING
DRILLING RIGS
EQUIPMENT
HEIGHT
HYDRAULIC CONTROL DEVICES
OFFSHORE DRILLING
OIL WELLS
SAFETY
SEA BED
UNDERWATER OPERATIONS
WELL COMPLETION
WELLHEADS
WELLS