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Method-and-apparatus-for-generating-data-and-analyzing-the-same-to-determine-fluid-depth-in-a-well

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Method and apparatus for generating data and analyzing the same to determine fluid depth in a well

Details

Inventors: Ahern, Timothy K.; Cebuhar, Phillip J.;
Assignee: Xelo, Inc. (Tulsa, OK)
Primary Examiner: Myracle; Jerry W.
Assistant Examiner:
Attorney, Agent or Firm: Laney, Dougherty, Hessin & Beavers

Method and apparatus for generating data and analyzing the same to determine fluid depth in a well. A gun assembly includes a pressurized chamber for initiating an acoustic pulse and a transducer for measuring pressure variations. The gun assembly is mounted on a well casing at the top thereof. An acoustic pulse is initiated and reflections from tubing collars, well equipment, perforation zones and the fluid level surface are detected by the transducer and converted to an analog signal which is digitized and stored in a memory. The stored data is processed to detect the fluid pulse reflection in view of a set of preselected pulse criteria. Acoustic pulse velocity is calculated by correlating the tubing collar depths, which are stored in the memory, with peaks in the acoustic log which indicate a corresponding tubing collar.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION Indicated generally at 10 in FIG.
1 is apparatus constructed in accordance with the instant invention.
Included therein is a cabinet 12, which encloses electronic circuits and an air compressor, and a transponder or gun assembly 16.
Gun assembly 16 is mounted on a casing 18 via connector 20.
The gun assembly is referred to herein as means for initiating an acoustic pulse.
The casing extends above the ground from a completed well as viewed in FIG.
4.
Cabinet 12 includes a keypad 20, shown in more detail in FIG.
2, and an alpha-numeric liquid crystal display 22 mounted thereon.
A number of cables, one of which is cable 24, extend from the lower end of cabinet 12.
The other end of cable 24 is connected to an alarm light 26 which may be mounted in a position easily viewable from a distance in order to provide an indication of an alarm condition, which will be hereinafter more fully described.
A cable 28 includes therein a set of leads which conduct electrical power from cabinet 12 to a preamplifier (not visible) received in housing 30 of the gun assembly.
Another set of leads conducts signals generated by a transducer (not visible) received in housing 32 of the gun assembly.
A third set of leads in cable 28 is connected to a pilot valve (not visible) in housing 34 of the gun assembly and momentarily opens the same responsive to a signal appearing on the leads associated therewith in cable 28.
A compressed air line 36 has one end connected to a compressor (not visible) received in cabinet 12 and the other end connected to an air reservoir 38.
Cable 40 is connected to a source of 120 volt AC power which provides power to the electronics and air compressor in cabinet 12.
A cable 42 connects control circuitry in cabinet 12 with a pump controller (not shown) which provides power to an oil well pump for pumping fluids from the well from which casing 18 extends.
In one operating mode, the apparatus of the instant invention may be used to sense the fluid depth in the well and generate control signals on cable 42 for turning the pump on and off responsive to changes in the well fluid level

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