Mudline casing hanger

Patent · Tue Feb 11 04:00:00 EST 1986

OSTI ID:5999477

Milberger, L J; Baron, D; Berner, P C

This patent describes a mudline casing hanger assembly for supporting a casing string within and from an outer tubular member. The mudline casing hanger consists of: 1.) an outer tubular member, the inner surface having a first recess, and an upwardly facing load carrying shoulder at an upper elevation, and an adjacent second recess at a lower elevation; 2.) an inner cylindrical casing hanger body, a downwardly facing shoulder around a substantial portion of the periphery, a first reduced diameter portion below the load shoulder, a second lesser diameter reduced diameter portion below the first diameter portion, an outwardly extending ring portion extending from the second reduced diameter portion and having a downwardly facing push shoulder tapered upwardly and outwardly, an outwardly extending ring, securable around the hanger at a spaced location below the push shoulder, and having an upwardly facing recovery surface; and 3.) a diametrically expandable and compressible collet surrounding the casing hanger body. The collet in its relaxed condition, has an inverted truncated frustoconical shape, outwardly extending support segments at the upper elevation on the collet. 4.) the collet when installed on the casing hanger body having the lower end biased inwardly, and the upper end biased outwardly; 5.) the collet is formed by having alternating and longitudinally overlapping part length slots opening upwardly and downwardly.

• Assignee: Vetco Offshore, Inc., Ventura, CA
• Patent Number(s): US 4569404
• OSTI ID: 5999477
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
DRILL BITS
DRILL PIPES
DRILLING EQUIPMENT
EQUIPMENT
FASTENERS
MECHANICAL STRUCTURES
PIPES
SUPPORTS
WELL CASINGS