Wells – Automatic
Reexamination Certificate
2000-03-20
2001-10-02
Dang, Hoang (Department: 3672)
Wells
Automatic
C166S250150, C166S372000
Reexamination Certificate
active
06296052
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS
Not applicable.
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the oil and gas industry and more particularly to a compressor operated piston system for removing fluid build up in a gas well hampering the production of the gas from the well. As is well known in the industry, some gas wells produce fluids. Fluid build up in the casing of a gas well results in a static head hampering or shutting off production of gas from earth formations or perforations in the casing. Therefore many different apparatuses have been employed to remove such fluid, such as a gas lift system or as by pumping, neither being entirely satisfactory.
This invention on the other hand provides an automatic operating system responding to gas pressure sensors and an axial piston assembly which removes fluid from the well bore casing permitting commercial production of gas to the fullest extent possible of a particular gas well.
2. Description of the Prior Art
I do not know of any patents or publications disclosing the apparatus of this invention.
BRIEF SUMMARY OF THE INVENTION
An axial assembly of pistons is axially attached to the depending end of tubing in a gas well and set above the formation or casing perforations. Fluid from the production zone enters the casing through an orifice at the depending end of the piston assembly. The piston assembly in an open position allows fluid from the production formation, after passing through the orifice, to enter the annulus between the tubing and the casing. Fluids in the flow stream separate and settle to the depending limit of the casing and create a static head of back pressure against the orifice which results in decreasing the gas pressure at the well head. This decrease in gas pressure is detected by pressure sensors which releases compressed gas from a recycling tank on the surface of the earth which enters the tubing and forces pistons in the piston assembly downward. The several pistons in the piston assembly multiplies the force of the recycling tank gas pressure so that the injected gas passes outwardly of the piston assembly through exit ports in the depending end thereof and enters the annulus under the trapped liquid in the annulus around the tubing to lift it to the surface of the earth while simultaneously closing the orifice and preventing any loss of injected gas into the earth formation. When the accumulated liquid in the casing annulus has been removed a pressure sensor opens a closed valve in the gas injection line and gas pressure generated by a compressor is directed to the recycling tank while the gas production enters the flow line connected with the gas well head, thus completing one cycle of operation which is automatically repeated when fluid build up in the casing annulus subsequently occurs.
The principal object of this invention is to provide a compressor lift system employing a series of axially connected pistons periodically removing fluid build up in a gas well casing annulus in response to gas well pressure sensors controlling the operation of a compressor and gas recycling tank.
REFERENCES:
patent: 3941510 (1976-03-01), Morgan
patent: 4267885 (1981-05-01), Sanderford
patent: 4405291 (1983-09-01), Canalizo
patent: 4480697 (1984-11-01), Goldaniga et al.
patent: 5806598 (1998-09-01), Amani
patent: 5857519 (1999-01-01), Bowlin et al.
Dang Hoang
Rhea Robert K.
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