Wells – Expansible anchor or casing – Liner hanger
Patent
1998-09-14
2000-05-23
Neuder, William
Wells
Expansible anchor or casing
Liner hanger
166212, E21B 2310
Patent
active
060655364
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an apparatus for setting a liner in a well casing.
2. Description of the Related Art Including Information Disclosed Under 37 CFR 1.97 & 1.98
During the construction of oil and gas wells a wellbore is drilled in the ground. After a certain depth is reached drilling is halted and a well casing lowered down the wellbore and cemented in place. Drilling is then recommenced until the wellbore reaches the next predetermined depth. At this stage drilling is halted and a liner lowered down the well casing. The liner is suspended from the well casing by a device known as a liner hanger which acts between the liner and the well casing.
The liner hanger can be set mechanically or hydraulically. U.S. Pat. No. 3,291,220 shows an apparatus for setting a liner in a well casing, which apparatus comprises a liner hanger and a running tool. The running tool is provided with a valve seat obstruction of which will, in use, allow fluid pressure to be developed to set the liner hanger in the well casing. Once the liner hanger has been set the running tool is rotated anti clockwise to unscrew the running tool from the liner hanger. The running tool is then recovered.
BRIEF SUMMARY OF THE INVENTION
The present invention is characterised in that after the liner hanger has been set the application of further pressure will displace the valve seat to enable the running tool to be released and to allow fluid flow through the running tool.
Preferably, the liner hanger comprises a plurality of slips which are mounted on a ring which is restrained against motion by a shear member.
Advantageously, the liner hanger is provided with a packer and a member which, in use, applies pressure to the packer to deform it to occupy the space between said liner hanger and the well casing.
Preferably, the apparatus includes a plurality of slips, at least one of which is attached to the member by a shear member, the arrangement being such that when pressure is applied to the member via the slips the packer deforms to occupy the space between the liner hanger and the well casing, and subsequently the shear member fails so that the slips move into a position between the member and the well casing to retain the packer in its deformed position.
Advantageously, the slips form part of a polished bore receptacle.
Preferably, the running tool comprises a liner support unit which comprises a body, a unit which extends outwardly from the body and engages one of the liner and the liner hanger, and wherein the valve seat is disposed in the liner support unit and is releasably attached thereto by a shear member.
Advantageously, the apparatus includes at least one member which acts between the valve seat and the unit to maintain the unit in the extended position.
Preferably, the liner support unit comprises the body, a support which is fast with or integral with the body, and a ring which is slidably mounted on the body, rests on the support, and accommodates the unit, the arrangement being such that when the unit is in its extended position the body and the support can be moved relative to the ring and the unit accommodated thereby to a secondary release position in which the unit can move radially inwardly.
Advantageously, the body is provided with a recess to accommodate the unit when the body is in the secondary release position.
Preferably, the running tool is provided with a lug which rests on the liner hanger, and the liner hanger is provided with a slot which, when the lug is moved into alignment with the slot allows the running tool to be moved relative to the liner hanger and the liner support unit to be moved to its secondary release position.
Normally the liner is provided with both a liner hanger and a polished bore receptacle which extends upwardly from the liner hanger and is fitted with a junk bonnet which acts between the polished bore receptacle and the running tool to inhibit debris, for example cement, coming into contact with the many parts of the running tool who
REFERENCES:
patent: 2290142 (1942-07-01), Burt
patent: 2315931 (1943-04-01), Burt et al.
patent: 2409811 (1946-10-01), Taylor, Jr. et al.
patent: 2913052 (1959-11-01), Harmon
patent: 2994381 (1961-08-01), Brown
patent: 3223170 (1965-12-01), Mott
patent: 3291220 (1966-12-01), Mott
patent: 3776307 (1973-12-01), Young
patent: 3845819 (1974-11-01), Mourlevat
patent: 3934652 (1976-01-01), Cochran
patent: 3942833 (1976-03-01), Plunk
patent: 4047565 (1977-09-01), Crickmer
patent: 4051896 (1977-10-01), Amancharla et al.
patent: 4058166 (1977-11-01), Crickmer
patent: 4096913 (1978-06-01), Kenneday et al.
patent: 4249601 (1981-02-01), White
patent: 4311194 (1982-01-01), White
patent: 4712614 (1987-12-01), Allwin et al.
patent: 4726425 (1988-02-01), Smith, Jr.
patent: 4911237 (1990-03-01), Melenyzer
patent: 4942924 (1990-07-01), Duncan
patent: 5038860 (1991-08-01), Baugh et al.
patent: 5311941 (1994-05-01), Baugh
patent: 5318131 (1994-06-01), Baker
patent: 5404955 (1995-04-01), Echols, III et al.
patent: 5582253 (1996-12-01), Fraser
patent: 5727631 (1998-03-01), Baker et al.
patent: 5732772 (1998-03-01), Borak, Jr. et al.
patent: 5735344 (1998-04-01), Duncan
patent: 5857524 (1999-01-01), Harris et al.
Dybevik Arthur Hrman
Gudmestad Tarald
Kvernsteun Ole Sveinung
Cho Chong S.
McClung Guy
Neuder William
Weatherford / Lamb, Inc.
LandOfFree
Apparatus for setting a liner in a well casing does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for setting a liner in a well casing, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for setting a liner in a well casing will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1830161