Wells – With below and above ground modification – Head for tool – piston or cleaner
Reexamination Certificate
2000-04-26
2001-10-16
Dang, Hoang (Department: 3672)
Wells
With below and above ground modification
Head for tool, piston or cleaner
C166S075150, C137S268000
Reexamination Certificate
active
06302199
ABSTRACT:
FIELD OF INVENTION
This invention relates generally to equipment used in the drilling, completion and workover of subterranean wells and more specifically, to equipment for use in oilfield tubulars, for example, in casing strings which are cemented in place in earth boreholes drilled into earth formations.
BACKGROUND
The process of drilling subterranean wells to recover oil and gas from reservoirs consists of boring a hole in the earth down to the petroleum accumulation and installing pipe from the reservoir to the surface. Casing is a protective pipe liner within the wellbore that is cemented into place to ensure a pressure-tight connection of the casing to the earth formation containing the oil and gas reservoir. The casing typically is run a single joint at a time as it is lowered into the wellbore. Tubulars other than casing are also used in the drilling, completion and workover of such wellbores, for example, drill pipe, completion tubing, production tubing, and the like. Moreover, various pieces of downhole equipment utilize balls which, when dropped through such tubulars, are activated by such balls, especially by using the pressure of fluid pumped from the earth's surface at predetermined values to cause such activation. For example, it is well known to drop a ball from the earth's surface down through a tubular onto a seat having a diameter less than the diameter of the dropped ball. An increase in the pumped pressure causes some element of the downhole equipment to be activated. Without limiting the foregoing, such activation may include the movement of a sleeve, the opening or closing of a port, the movement of a valve, the fracturing of a frangible disk, the release of elastomeric cement wiper plugs, the control of downhole packers, etc.
The controlled dropping of one or more balls into the top portion of a tubular at the earth's surface is therefore very important, both as to the diameter of the ball or balls, and the timing of the release of the ball or balls.
REFERENCES:
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patent: 5277248 (1994-01-01), Breland
patent: 6056058 (2000-05-01), Gonzalez
Hawkins Samuel P.
Latiolais, Jr. Burney J.
Lutgring Keith T.
Dang Hoang
Frank's International, Inc.
The Matthews Firm
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