US3625285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stimulating wells with liquid explosives
Assignee: BP America Production Co
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Filing: 1970-04-22
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Granted: 1971-12-07
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Expires: 1990-04-22
Abstract
Abstract This is a method for increasing the permeability of underground formations adjacent a well bore by explosive fracturing. This invention relates especially to a special method of placing the liquid explosive in the well. It includes setting a plugged packer in the well just above the formation to be stimulated. A tubing string is run in the well with the lower end just above the plugged packer. The selected amount of liquid explosive is then forced into the tubing string. After this, the tubing string is inserted in the packer and the plug of the packer is removed. The explosive is then forced downward into the well bore. The packer is replugged, tubing is removed and the well bore stemmed. The detonation is then effected.
Inventors
- 👤 Clarence R Fast
- 👤 George C Howard
- 👤 Riley F Farris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:52
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26; E21B43/263
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
22 words
A method as defined in claim 1 in which a rubber bottom plug is placed between said liquid and said liquid explosive.
Claim 2
Dependent Claim
41 words
A method as defined in claim 1 in which prior to said stemming, said tubing string is disconnected from said packer and withdrawn from the vicinity of said packer and in which said stemming includes placing said cement above the packer.
Claim 3
Dependent Claim
48 words
A method as defined in claim 1 including the step of attaching a drillable section of tubing below said packer with its lower end above the bottom of said well so that said liquid explosive can be displaced out the lower end of said drillable section of tubing.
Claim 4
Independent Claim
96 words
A method of stimulating a well by the use of a liquid explosive which comprises: setting a plug in said well above the formation to be stimulated; running a tubing string with the lower end just above said plug; forcing said liquid explosive into said tubing string until the desired amount is injected therein; then forming a continuous conduit from the lower end of said tubing to below said plug; forcing said liquid explosive from said tubing string through said continuous conduit to the well below said plug; sealing said continuous conduit; detonating said liquid explosive.
Claim 5
Dependent Claim
34 words
A method as defined in claim 5 including the step of removing said tubing string from the vicinity of said plug and stemming said well Prior to said step of detonating said liquid explosive.
Claim 6
Dependent Claim
37 words
A method as defined in claim 6 in which the step of detonating said liquid explosive is accomplished by placing a timed detonator in the bottom of said well prior to the injection of said liquid explosive.
Claim 7
Dependent Claim
41 words
A method as defined in claim 6 in which the step of detonating said liquid is accomplished by dropping a detonator through said liquid explosive through said tubing string and said continuous conduit prior to the sealing of said continuous conduit.
Claim 8
Dependent Claim
35 words
A method as defined in claim 6 including the step of removing said tubing string from the vicinity of said plug, filling said well with liquid prior to said step of detonating said liquid explosive.
Claim 9
Independent Claim
117 words
A method of stimulating a well by the use of a liquid explosive which comprises: setting a packer in said well above the formation to be stimulated; running a tubing string with the lower end just above said packer; forcing said liquid explosive into said tubing string until the desired amount is injected therein; connecting the lower end of said tubing string into said packer to form a continuous passage from said tubing to below said packer; forcing said liquid explosive from said tubing string to the well below said packer; sealing the passage through said packer so that the well bore below said packer is isolated from the well bore above; and detonating said liquid explosive.
Claim 10
Dependent Claim
34 words
A method as defined in claim 10 including the steps of removing said tubing string from the vicinity of said packer and stemming said well prior to said step of detonating said liquid explosive.
Claim 11
Independent Claim
150 words
A method of stimulating a well by the use of a liquid explosive which comprises: providing a drillable packer fitted with a plug catcher sub and setting said packer above the formation to be stimulated; equipping a tubing string with a special locator tubing seal nipple near the bottom and; running said tubing string in said well bore until said seal nipple is a few feet above the packer; filling the well above the packer with a first nonexplosive liquid; forcing liquid explosive into the tubing until the desired amount of liquid explosive is injected into the tubing string; thereafter connecting the tubing string to the packer; retaining the liquid explosive in said tubing string until it is connected to the packer; displacing the liquid explosive out of the tubing string into the well bore below the packer; setting a plug in the plug catcher sub; and detonating the explosive.
Claim 12
Dependent Claim
34 words
A method as defined in claim 12 including the steps of disconnecting the tubing string from the packer and removing it from the vicinity of the packer and stemming the well above the packer.
Claim 13
Independent Claim
104 words
A method of stimulating a well by the use of a liquid explosive which comprises: setting a packer in said well above the formation to be stimulated; thereafter running a tubing string and latching same into the packer; forming a continuous passage from said tubing to below said packer; forcing said liquid explosive into said tubing string until the desired amount is injected therein; forcing said liquid explosive from said tubing string to the well below said packer; sealing the passage through said packer so that the well bore below said packer is isolated from the well bore above; and detonating said liquid explosive.
Claim 14
Dependent Claim
34 words
A method as defined in claim 14 including the steps of removing said tubing string from the vicinity of said packer and stemming said well prior to said step of detonating said liquid explosive.
References Cited (Backward Citations)
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Cited
US2707436A
Cited
US2766828A
Cited
US3002454A
Cited
US3219113A
Cited
US3336982A
Cited
US3561532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |