Dennis A Wichkoski

US Patent:

43735843, Feb 15, 1983

Filed:

May 7, 1979

Appl. No.:

6/036964

Inventors:

Raphael J. Silberman - Houston TX
Frederick T. Tilton - La Habra CA
Everett H. Smith - Houston TX
Dennis A. Wichkoski - Pasadena TX

Assignee:

Baker International Corporation - Orange CA

International Classification:

E21B 1900

US Classification:

1661177

Abstract:

An apparatus is provided for producing a well from at least one productive zone penetrated by the well bore in which casing is set below the top of the well. Tubing hanger means support at least one production tubing string extending downwardly in the well bore and communicating with a production zone. Anchor means on the tubing hanger means are actuatable into anchoring engagement with the casing. The tubing hanger means receives at least one upper production tubing string section typically carrying safety valve means thereon extending to the top of the well and sealingly engageable with the tubing hanger means before, during and after the anchoring engagement of the tubing hanger means with the casing, whereby the upper production tubing string section is respectively communicable with the downwardly extending production tubing string when the tubing hanger is set. A latch apparatus is carried on and extending between the upper production tubing string sections for initial securement of the tubing hanger means to each of the upper production tubing string sections, the latch apparatus carrying the sum of the strength of the tubing hanger means and each of the lower production tubing string sections. Anchoring of the tubing hanger and sealing engagement therein of the production tubing string section may be effected in one trip down the well, without the requirement of retrieval of a work string or other means used to set the hanger, and without subsequent re-entry into the well of the upper production tubing string section carrying the safety valve means for sealing engagement into the hanger means.

US Patent:

42483077, Feb 3, 1981

Filed:

May 7, 1979

Appl. No.:

6/036908

Inventors:

Raphael J. Silberman - Houston TX
Frederick T. Tilton - La Habra CA
Everett H. Smith - Houston TX
Dennis A. Wichkoski - Pasadena TX

Assignee:

Baker International Corporation - Orange CA

International Classification:

E21B 2302

US Classification:

166315

Abstract:

The present invention provides a latch assembly carriable on a tubing string extendible into a subterranean well, the latch assembly being selectively engageable between upper and lower sections of the tubing string. The latch assembly comprises an outer housing and an inner body, with latching means carried on one of the housing and the body for selectively securing the latch apparatus to the lower section. Latch engaging means are carried on the other of the housing and the body and the lower tubing section for selective co-engagement between the latching means, the lower tubing section, and one of the housing and the body. Piston means are on one of the housing and the body and have a piston head with first and second piston chambers between the piston head. Control means are removable from the latch assembly to direct fluid pressure transmitted through the tubing string to the latch assembly and having passageways to selectively provide a first fluid flow path within the control means and the latch assembly to one of the upper and lower piston chambers to shift the housing and the body relative to one another to release the latching means from the lower section. The control means has passageways selectively providing a second fluid flow path therethrough to the other of the upper and lower piston chambers to shift the housing and the body relative to one another to engage or re-engage the latching means to the lower section.