Wells – Processes – With indicating – testing – measuring or locating
Patent
1993-03-31
1994-06-28
Bui, Thuy M.
Wells
Processes
With indicating, testing, measuring or locating
175 45, E21B 4400
Patent
active
053238567
ABSTRACT:
A system for sensing the passage of a member past a predetermined location along a tubing disposed in an oil or gas well comprises: a magnet connected to the member, the magnet having a soft body so that the magnet can be drilled out by a drill bit lowered into the well after the member has passed the predetermined location; and a sensor, connected to the outside of the tubing at the predetermined location, for detecting a magnetic field of the magnet as the member with the magnet connected thereto passes the sensor. A method for assisting the proper placement of a cement slurry in an oil or gas well comprises: pumping a cement slurry through a tubing into an oil or gas well; releasing a cementing plug into the tubing in series with the cement slurry, the cementing plug having a magnet as referred to above; and sensing the cementing plug at a predetermined location along the tubing, including: generating a null signal in response to providing a biasing magnetic field in opposition to a magnetic field naturally occurring in the tubing at the predetermined location; and changing the null signal to an indicator signal in response to the magnet moving in the tubing to the predetermined location.
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Davis James L.
Van Berg, Jr. Charles F.
Bui Thuy M.
Christian Stephen R.
Gilbert III E. Harrison
Halliburton Company
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