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Publication numberUS3848668 A
Publication typeGrant
Publication dateNov 19, 1974
Filing dateDec 22, 1971
Priority dateDec 22, 1971
Publication numberUS 3848668 A, US 3848668A, US-A-3848668, US3848668 A, US3848668A
InventorsSizer P, Young C
Original AssigneeOtis Eng Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Apparatus for treating wells
US 3848668 A
Abstract
A method of and apparatus for treating wells to provide surface controlled subsurface safety systems in the wells, whether previously completed wells or newly completed wells. A method and apparatus is provided for installing receptacles in the well flow conductors below the surface for receiving surface controlled subsurface safety valves therein for controlling undesired flow from the well in the event of emergency, disaster or accident damaging the well surface flow controlling system or threatening the integrity thereof. Also, a method and apparatus is provided for installing a hanger for well flow conductors in the well casing below the surface for supporting the flow conductor or conductors in the well casing below the surface and then installing the receptacles in the well flow conductors below the surface for receiving surface controlled subsurface safety valves therein.
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Description  (OCR text may contain errors)

United StatesPatent [1 1 Sizer et al.

[ 1 Nov. 19, 1974 APPARATUS FOR TREATING WELLS [75] Inventors: Phillip S. Sizer, Dallas; Carter R.

Young, Lewisville, both of Tex.

[73] Assignee: Otis Engineering Corporation, Dallas, Tex.

[22] Filed: Dec. 22, 1971 [21] Appl. No.: 210,727

: [52] US. Cl 166/72, 166/299, 166/55 [51] Int. Cl E21b 23/00 [58] Field of Search 166/277, 313, 297-299,

{56] References Cited UNITED STATES PATENTS 2,918,125 12/1959 Sweetman 166/297 3,208,531 9/1965 Tamplen.... 166/125 3,216,501 11/1965 Page 166/72 3,380,528 4/1968 Timmons 166/277 3,411,584 11/1968 Sizer et al. 166/72 3,696,868 10/1972 Taylor l 166/315 3,731,742 5/1973 Sizer et al. 166/315 Primary ExaminerDavid H. Brown [5 7] ABSTRACT A method of and apparatus for treating wells to provide surface controlled subsurface safety systems in the wells, whether previously completed wells or newly completed wells. A method and apparatus is provided for installing receptacles in the well flow conductors below the surface for receiving surface controlled subsurface safety valves therein for controlling undesired flow from the well in the event of emergency, disaster or, accident damaging the well surface flow controlling system or threatening the integrity thereof. Also, a method and apparatus is provided for installing a hanger for well flow conductors in the well casing below the surface for supporting the flow conductor or conductors in the well casing below the surface and then installing the receptacles in the well flow conductors below the surface for receiving surface controlled subsurface safety valves therein.

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ATTORNEY 1 APPARATUS FOR TREATING WELLS SUBJECT MATTER AND OBJECTS OF THE INVENTION This application is related to the coassigned copending application of Henry J. James and Carter R. Young, Ser. No. 270,977, filed July 12, 1972, for Method of and Apparatus for Treating and Completing Wells.

This invention relates to new and useful improvements in methods of and apparatus for equipping wells with surface controlled subsurface safety valves, either before or after the well has been completed in the usual manner.

Heretofore, when a well has been completed it has been necessary to remove the tubing string or strings from within the well bore in the casing, first killing the well, unseating the packers, and then removing the string and packers and other fittings from the well prior to installing new strings of pipe, refitted or new packers, subsurface safety valve receptacles and control fluid lines for the valves, then reinstalling the tubing hanger and surface controls and flow lines, including an exit fitting for the control fluid pressure line at the surface before the well could be returned to production. This is an expensive and time consuming operation, and may result in damage to the producing formation of the well as a result of the loading fluid used and other operations performed in making the revised installation. Such operations are expensive due to the heavy equipment and the long period of time required for their performance. Also, the deleterious effects of the treating and loading fluids on the producing formation often result in a reduction in the productivity or flow of desirable fluids from the formation and a commensurate reduction in the value of the well.

It is, therefore, one object of the invention to provide a new and improved method of and system for installing surface controlled subsurface safety valves in the conductor or conductors of wells.

A particular object of the invention is to provide a method of and system for installing surface controlled subsurface safety valves in the flow conductor or conductors of wells which have been previously completed with the flow conductor or conductors in place therein.

An important object of the invention is to provide a method of and apparatus for disconnecting the upper portion of one or more flow conductors in a well from the remainder of such conductors therebelow and installing a receptacle and replacement upper flow conductor portion in flow communication with each of such flow conductors therebelow with a surface controlled subsurface safety valve in such replacement upper flow conductor portion for controlling fluid flow through each such flow conductor.

A further object of the invention is to provide a method and apparatus of the character set forth wherein the receptacle and replacement upper flow conductor portion are provided with means for detachably connecting the receptacle and replacement upper flow conductor portion for each flow conductor of the well to permit removal and replacement of the replacement upper flow conductor portion and the safety valve when desired.

Still another object is to provide a method and apparatus as set forth wherein the surface controlled subsurface safety valve is insertable and removable independently of the replacement upper flow conductor portion.

A further important object of the invention is to provide a method and apparatus of the character set forth wherein a supplementary surface controlled subsurface safety valve may be installed in the replacement upper flow conductor portion in the event of the original safety valve becoming inoperative or ineffective.

A further object of the invention is to provide in a method and apparatus of the character set forth means for directing a hanger into place over a flow conductor in place in the well and actuating the hanger into anchoring supporting engagement with the casing and the flow conductor either before or after the upper portion of the flow conductor above the hanger has been removed from connection with the flow conductor therebelow. I

A further particular object of the invention is to provide a method and apparatus for servicing wells to provide a subsurface hanger in the well engaging between the flow conductor andthe well casing and supporting the flow conductor therebelow against longitudinal downward movement in the casing, then installing a receptacle and replacement upper flow conductor portion above the hanger in flow communication with the upper end of the flow conductor remaining in place in the well casing for receiving a surface controlled subsurface safety valve in the receptacle for controlling fluid flow through the conductor and replacement upper flow conductor portion to the surface in the event of either an imminent or impeding disaster or under any other desired circumstances, and wherein the method and apparatus in installable in wells already previously completed without removing from the well flow conductors, or packer, or other well tools connected therewith already in place in the well below the point of connection of the hanger with the flow conductor.

A further object of the invention is to provide a method and apparatus of the character desribed which may be used with either single flow conductor well installations or in multiple flow conductor well installations for controlling fluid flow through the conductors to the surface.

Still another object of the invention is to provide a method and apparatus of the character described which is adapted for use in wells in which the well is serviced or treated by means of through the flow line pump-down operations, and in which the pump-down tools may be moved through the surface controlled subsurface safety valve and receptacle and hanger without affecting the customary operation of such pump-down tools.

It is still another object of the invention to provide a method and apparatus of the character described wherein the installation may be made without rotary manipulation of the flow conductor in place in the well, particularly that portion thereof left in place in the well; and wherein the surface controlled subsurface safety valve and replacement upper flow conductor portion may be removed and replaced without rotation thereof.

Still another object of the invention is to provide an apparatus and method of the character described wherein the replacement upper flow conductor portion or extension and the well equipment at the surface may

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2918125 *May 9, 1955Dec 22, 1959Sweetman William GChemical cutting method and apparatus
US3208531 *Aug 21, 1962Sep 28, 1965Otis Eng CoInserting tool for locating and anchoring a device in tubing
US3216501 *May 26, 1961Nov 9, 1965Page Jr John SRetrievable safety valve
US3380528 *Sep 24, 1965Apr 30, 1968Tri State Oil Tools IncMethod and apparatus of removing well pipe from a well bore
US3411584 *Jan 3, 1967Nov 19, 1968Otis Eng CoWell tools
US3696868 *Dec 18, 1970Oct 10, 1972Otis Eng CorpWell flow control valves and well systems utilizing the same
US3731742 *Mar 17, 1971May 8, 1973Otis Eng CorpWell flow controlling method, apparatus and system
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5309988 *Nov 20, 1992May 10, 1994Halliburton CompanyElectromechanical shifter apparatus for subsurface well flow control
US6739395 *Jan 15, 2003May 25, 2004Control Flow Inc.Tensioner/slip-joint assembly
US7258168 *Jul 27, 2001Aug 21, 2007Enventure Global Technology L.L.C.Liner hanger with slip joint sealing members and method of use
EP0024214A2 *Aug 19, 1980Feb 25, 1981Otis Engineering CorporationA by-pass valve for a well testing apparatus
Classifications
U.S. Classification166/72, 166/55, 166/299
International ClassificationE21B43/00, E21B34/00, E21B43/14, E21B29/00, E21B33/047, E21B33/03, E21B43/02, E21B29/02, E21B34/14, E21B43/10, E21B34/10
Cooperative ClassificationE21B34/105, E21B2034/002, E21B43/10, E21B33/047, E21B43/14, E21B29/02, E21B34/14
European ClassificationE21B43/10, E21B29/02, E21B33/047, E21B43/14, E21B34/10R, E21B34/14
Legal Events
DateCodeEventDescription
Nov 15, 1993ASAssignment
Owner name: HALLIBURTON COMPANY, TEXAS
Free format text: MERGER;ASSIGNOR:OTIS ENGINEERING CORPORATION;REEL/FRAME:006779/0356
Effective date: 19930624