US3901313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well treatment
Assignee: Individual
•
Filing: 1973-08-13
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Granted: 1975-08-26
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Expires: 1993-08-13
Abstract
Abstract Chemical additives are forced into wells using the pressure above atmospheric pressure, at which the well''s product issues from the well. The additive is forced into the casing of the well and product from the inner tubing string is used to flush the additive down. Apparatus for practicing that method includes a pump connected to pump the additive from a supply container into the well casing. The motor or prime mover for the pump is driven by the pressurized product of the well whereby no external power source is required. The pump delivers additive at higher pressure than the pressure at which product drives the pump motor but it delivers a smaller volume of additive than the volume of product that drives the motor. The structure includes a timing device which results in operation of the pump through a number of cycles at each well treatment and spacing of treatments as desired. It provides for flushing with product during the course of each treatment.
Inventors
- 👤 Thaddeus M Doniguian
- 👤 Jared Erle Larsen
- 👤 Susumu Takabayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:14
CPC Classifications
E; E21; E21B; E21B41/00; E21B41/02; E21B33/00; E21B33/02; E21B33/03; E21B33/068; F; F04; F04B; F04B53/00; F04B53/10; F04B53/12; F04B53/122; F04B9/00; F04B9/08; F04B9/12; F04B9/129; F04B9/131; F04B9/133; Y; Y10; Y10S; Y10S166/00; Y10S166/902
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
333 words
Apparatus for use in applying chemical from a storage container to the casing of a well of the kind in which fluid product issues at positive pressure from a tubing string in the casing comprising: a gas separator for connection to said tubing string such that pressurized gas is separated from said product and stored; a pumping means including a pump and flow conduits for transferring chemical from said storage container to said well casing and a gas pressure powered driver for driving said pump, the driver having mechanical advantage over the pump such that delivery pressure from the pump exceeds the pressure applied to the driver; a normally closed, pressure-opened connection from the tubing to the casing of the well; a line connecting the separator to said driver and to said pressure-opened connection; control means including valving in said line aNd a timer for actuating said valving for causing the driver to operate the pump and for opening said connection a predetermined number of times after a predetermined interval; said pumping means comprising a driver cylinder and piston and a pumping cylinder and piston, the two pistons being mounted on a common shaft for reciprocation together in their respective cylinders and the pump piston and cylinder having smaller crosssectional area than the driver piston and cylinder; said control means comprising a three-way valve having an inlet for connection to said gas separator and having two alternate outlets each connected to the driver cylinder at a respectively associated side of the driver piston, one of the outlets of said three-way valve being connected to said pressure-opened connection; means for mounting said pumping means such that it can extend through the bung hole of a drum with its pump extending within the drum; and said three-way valve including an operating shaft and in which said timer comprises a rotating cam position to actuate said cam in a given rotational position and means for rotating said cam for a given period during a longer period.
Claim 2
Dependent Claim
333 words
Apparatus for use in applying chemical from a storage container to the casing of a well of the kind in which fluid product issues at positive pressure from a tubing string in the casing comprising: a gas separator for connection to said tubing string such that pressurized gas is separated from said product and stored; a pumping means including a pump and flow conduits for transferring chemical from said storage container to said well casing and a gas pressure powered driver for driving said pump, the driver having mechanical advantage over the pump such that delivery pressure from the pump exceeds the pressure applied to the driver; a normally closed, pressure-opened connection from the tubing to the casing of the well; a line connecting the separator to said driver and to said pressure-opened connection; control means including valving in said line aNd a timer for actuating said valving for causing the driver to operate the pump and for opening said connection a predetermined number of times after a predetermined interval; said pumping means comprising a driver cylinder and piston and a pumping cylinder and piston, the two pistons being mounted on a common shaft for reciprocation together in their respective cylinders and the pump piston and cylinder having smaller crosssectional area than the driver piston and cylinder; said control means comprising a three-way valve having an inlet for connection to said gas separator and having two alternate outlets each connected to the driver cylinder at a respectively associated side of the driver piston, one of the outlets of said three-way valve being connected to said pressure-opened connection; means for mounting said pumping means such that it can extend through the bung hole of a drum with its pump extending within the drum; and said three-way valve including an operating shaft and in which said timer comprises a rotating cam position to actuate said cam in a given rotational position and means for rotating said cam for a given period during a longer period.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |