Wells – Processes – Placing or shifting well part
Patent
1992-10-06
1994-06-07
Neuder, William P.
Wells
Processes
Placing or shifting well part
166207, 166217, E21B 2300
Patent
active
053181310
DESCRIPTION:
BRIEF SUMMARY
STATEMENT OF THE PRIOR ART
Various types of mechanical and hydraulic liner hanger arrangements have been proposed and used for engaging tapered cone segments or surfaces with slips, also referred to as slip segments, to secure a liner in a well casing, so that the liner becomes an extension of the well casing. In some situations, the slip segments are moved up to engage the cone surfaces and in others the cone surfaces are moved down to engage the slip segments which urges the slips to securing relation with the well casing to secure the liner within the casing and depending therefrom. Some setting tools have incorporated pistons for setting hydraulic liner hangers, and thus are removed from the well when the setting tool is removed.
Where the liner and liner hanger are used in a corrosive environment it is preferred that the liners have a high chromium content to attempt to reduce the effects of corrosion. This then requires that all other equipment or components associated with the liner which remain in the well bore be made of high chromium content to reduce the deleterious effects of electrolysis. Increasing the number of liner associated components that require chromium or other alloys may greatly increase the cost of the liner installation. Where the liner hanger employed with the liner is hydraulically actuated, it has been common practice heretofore to provide a port in the liner hanger for actuation of the liner hanger to secure the liner in position. This reduces the pressure integrity of the liner.
Another problem with hydraulic set hangers is that the slips are generally set by a piston that is located above ports which are located in a barrel connected with the liner which subjects members which surround the barrel to pressures which are present in the liner. In most cases, the surrounding member can be heat treated to increase its yield strength to with stand normal or slightly higher well bore pressures, but this does not completely solve the problem, because maintaining the piston seals between the barrel and the surrounding member cannot be assured. If a leak occurs, fluid communication between the inside and outside of the liner is established which is undesirable. Hence, it is desirable to maintain the pressure integrity of the liner and maintain its originally designed and intended strength without creating ports or passages therein which may reduce, or adversely effect the liner wall strength.
U.S. Pat. No. 5,038,860 shows one attempt to overcome the above problem by eliminating the port in the liner and placing it in the setting tool. However, it provides a passage in the wall of the liner substantially through out the longitudinal extent of the liner. Apparently by reason of the size of the passage in the liner wall and to over come the problems of contaminants normally present in well fluid, an isolated fluid chamber is formed between an upper piston and a lower piston. Well fluid pressure on one of the pistons is transmitted through a port in the setting tool to the fluid in the isolated chamber to move a piston sleeve up to push the slips up into engagement with cone segments.
In addition to the cost of forming the above structure, the inherent weakness created in the liner by the passage is apparent. Also, such structure requires that the lower piston, the piston sleeve and other components are not removed with the setting tool, but which remain in the well bore be formed of chromium.
STATEMENT OF THE INVENTION
One object of the present invention is to provide a hydraulic liner hanger setting arrangement which eliminates passages and ports from the liner, maintains the pressure integrity of the liner, and requires that only the liner, the slips and the cones which hang, or support the liner in the well casing, and an outer tubular member on the liner remain in the well casing.
Another object of the invention is to reduce the cost of running alloy liner, and liner hangers, having high chromium content by maintaining the components that remain in the well casing at a minimum.
A
REFERENCES:
patent: 3223170 (1965-12-01), Mott
patent: 4391325 (1983-07-01), Baker et al.
patent: 4688642 (1987-08-01), Baker
patent: 4926938 (1990-05-01), Lindsey, Jr.
patent: 5038860 (1991-08-01), Baugh et al.
patent: 5086845 (1992-02-01), Baugh
Hayden Jack W.
Neuder William P.
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