US3830304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wellhead isolation tool and method of use thereof
Assignee: Halliburton Co
•
Filing: 1973-06-04
•
Granted: 1974-08-20
•
Expires: 1993-06-04
Abstract
Abstract Apparatus for isolating a production tubing string in an oilwell from the control head whereby pressures higher than the rated pressure of the control head may be applied to the producing formation, utilizes an outer housing with a telescoping inner mandrel and seals therebetween, with said outer housing being adapted for connection to the control head and the inner mandrel being capable of moving into the control head to make a fluidically sealed connection with the production tubing thereby isolating the control head from the higher pressures being applied through the tubing into the formation.
Inventors
- 👤 A Cummins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:35
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/068
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
205 words
Apparatus for fluidically communicating the production string of an oilwell with high pressure fluid supply means at the surface while isolating fluid control equipment in the wellhead from high pressure fluids supplied through said apparatus from the high pressure fluids supply means, said apparatus comprising: a. elongated tubular housing means arranged to be fluidically connected to said wellhead and further arranged to define an inner bore therethrough; b. elongated tubular inner mandrel means concentrically and slidably located within said housing means in fluidic sealing engagement therewith; said innermandrel means further adapted to extend out of said housing means, both above and below said housing means; c. means for moving said innermandrel means within said housing means, said moving means being capable of extending said innermandrel means downward through said housing means, said moving means further adapted for extending said innermandrel means upward out of said housing means; d. seal means for providing sealing engagement between said mandrel means and the production tubing string within said well; said sealing means adapted for providing fluidic sealing engagement between said innermandrel means and said production tubing string; and e. means on said innermandrel means for allowing the bore through said innermandrel means to be alternately opened and closed.
Claim 2
Dependent Claim
205 words
Apparatus for fluidically communicating the production string of an oilwell with high pressure fluid supply means at the surface while isolating fluid control equipment in the wellhead from high pressure fluids supplied through said apparatus from the high pressure fluids supply means, said apparatus comprising: a. elongated tubular housing means arranged to be fluidically connected to said wellhead and further arranged to define an inner bore therethrough; b. elongated tubular inner mandrel means concentrically and slidably located within said housing means in fluidic sealing engagement therewith; said innermandrel means further adapted to extend out of said housing means, both above and below said housing means; c. means for moving said innermandrel means within said housing means, said moving means being capable of extending said innermandrel means downward through said housing means, said moving means further adapted for extending said innermandrel means upward out of said housing means; d. seal means for providing sealing engagement between said mandrel means and the production tubing string within said well; said sealing means adapted for providing fluidic sealing engagement between said innermandrel means and said production tubing string; and e. means on said innermandrel means for allowing the bore through said innermandrel means to be alternately opened and closed.
Claim 3
Dependent Claim
56 words
The apparatus of claim 1 wherein said means for moving said innermandrel means within said housing means comprises hydraulic piston means between said innermandrel means and said housing means, said piston means arranged to receive hydraulic pressure appliEd thereto and convert said hydraulic pressure application into telescopic movement of said innermandrel with respect to said outermandrel.
Claim 4
Dependent Claim
86 words
The apparatus of claim 2 wherein said piston means further comprises an annular exterior shoulder on said innermandrel means and an annular interior recess in said housing means, said annular shoulder adapted to sealingly engage in said recess to form an annular piston therein, and said housing means having first and second port means through the wall thereof, said first port means communicating with one end of said annular interior recess and said second port means communicating with the opposite end of said annular interior recess.
Claim 5
Dependent Claim
42 words
The apparatus of claim 1 wherein said seal means comprises elastomeric sealing cup means located around the lower end of said innermandrel means, said cup means adapted to snugly and sealingly engage the inner bore of production tubing in an oil well.
Claim 6
Dependent Claim
41 words
The apparatus of claim 1 wherein said innermandrel means bore closing means comprises connection means at the upper end of said innermandrel means for receiving in sealing attachment valve means to alternatively close and open said bore of said innermandrel means.
Claim 7
Dependent Claim
56 words
The apparatus of claim 5 wherein said tubular housing means further comprises a tubular upper major housing and a lower tubular adapter, said adapter having first connection means adapted to connect fluidically with said major housing and said adapter further having second connection means adapted to be sealingly engaged with the control cross on a wellhead.
Claim 8
Dependent Claim
29 words
The apparatus of claim 1 further comprising means for locking said innermandrel means to said housing means in the lowermost position of said innermandrel means within said housing means.
Claim 9
Independent Claim
267 words
A method of applying fluidic pressure to an underground formation penetrated by an oil well bore hole wherein said well borehole contains a production conduit string and has control equipment including one or more valves and a control cross at the surface, said method obviating the need for killing the well while simultaneously bypassing high pressure fluids through the surface control equipment; said method comprising: a. closing the lowermost valve in the control equipment at the surface; b. removing the uppermost portion of said control equipment; c. sealingly attaching to the top of said remaining control equipment a tubular housing having an elongated inner bore aligned with the bore of said control equipment; said tubular housing having sealingly and slidably located therein an elongated tubular innermandrel extending above and capable of extending below said tubular housing, said innermandrel having sealing means at the lower end thereof capable of sealingly engaging the production tubing in said well borehole and means at the top for attaching opening and closing means to said innermandrel bore; d. closing the bore through said innermandrel; e. opening the lowermost valve and all valves in line with the bore of said innermandrel and said housing thereby providing an unobstructed straightthrough vertical bore through said control equipment; f. moving said innermandrel through said housing and into said control equipment bore until said innermandrel has passed entirely through said control equipment; g. sealingly engaging said innermandrel with said production conduit; and h. supplying the desired high pressure fluids through said innermandrel bore from the top portion thereof into the production conduit, thereby bypassing said control equipment.
Claim 10
Independent Claim
267 words
A method of applying fluidic pressure to an underground formation penetrated by an oil well bore hole wherein said well borehole contains a production conduit string and has control equipment including one or more valves and a control cross at the surface, said method obviating the need for killing the well while simultaneously bypassing high pressure fluids through the surface control equipment; said method comprising: a. closing the lowermost valve in the control equipment at the surface; b. removing the uppermost portion of said control equipment; c. sealingly attaching to the top of said remaining control equipment a tubular housing having an elongated inner bore aligned with the bore of said control equipment; said tubular housing having sealingly and slidably located therein an elongated tubular innermandrel extending above and capable of extending below said tubular housing, said innermandrel having sealing means at the lower end thereof capable of sealingly engaging the production tubing in said well borehole and means at the top for attaching opening and closing means to said innermandrel bore; d. closing the bore through said innermandrel; e. opening the lowermost valve and all valves in line with the bore of said innermandrel and said housing thereby providing an unobstructed straightthrough vertical bore through said control equipment; f. moving said innermandrel through said housing and into said control equipment bore until said innermandrel has passed entirely through said control equipment; g. sealingly engaging said innermandrel with said production conduit; and h. supplying the desired high pressure fluids through said innermandrel bore from the top portion thereof into the production conduit, thereby bypassing said control equipment.
Claim 11
Dependent Claim
92 words
The method of claim 8 whereby said step of moving said innermandrel through said housing further comprises applying an activating fluid under pressure to the upper side of an annular piston located on said innermandrel, said annular piston being sealingly and slidably engaged in an annular piston recess in said housing, said pressure application being sufficient to overcome sliding friction between said innermandrel and said housing and capaBle of moving said mandrel into sealing engagement with said production conduit, said pressure applying step continuing until said mandrel engages said production conduit string.
Claim 12
Dependent Claim
45 words
The method of claim 8 further comprising prior to said step of supplying high pressure fluid through said innermandrel, the step of locking said innermandrel to said housing in the lowermost position of said innermandrel thereby maintaining said mandrel securely engaged in said production conduit.
Claim 13
Independent Claim
177 words
A method of obtaining fluidic communication with a formation through an oil well production conduit string wherein said communication allows applying fluid pressure exceeding the maximum rated pressure of surface control equipment on said well, without need for killing the well or removing said surface control equipment, said method of communicating with said formation comprising: a. closing-in said well by closing a valve in the vertical bore of said surface control equipment; b. removing an upper portion of said surface control equipment thereby exposing the portion of said bore above said closed valve; c. closing in said upper bore portion by attaching to said surface control equipment means containing extendible conduit therein; d. opening said valve thereby reestablishing communication of closed-in lower bore portion with said closed-in upper bore portion; e. extending said extendible conduit through the bore of said surface control equipment; f. sealingly engaging said extendible conduit with the production conduit in said well thereby allowing fluidic communication through said extendible conduit from the surface to the production conduit while bypassing said surface control equipment.
Claim 14
Independent Claim
177 words
A method of obtaining fluidic communication with a formation through an oil well production conduit string wherein said communication allows applying fluid pressure exceeding the maximum rated pressure of surface control equipment on said well, without need for killing the well or removing said surface control equipment, said method of communicating with said formation comprising: a. closing-in said well by closing a valve in the vertical bore of said surface control equipment; b. removing an upper portion of said surface control equipment thereby exposing the portion of said bore above said closed valve; c. closing in said upper bore portion by attaching to said surface control equipment means containing extendible conduit therein; d. opening said valve thereby reestablishing communication of closed-in lower bore portion with said closed-in upper bore portion; e. extending said extendible conduit through the bore of said surface control equipment; f. sealingly engaging said extendible conduit with the production conduit in said well thereby allowing fluidic communication through said extendible conduit from the surface to the production conduit while bypassing said surface control equipment.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |