Field Test Confirms Accuracy of New Bottom-Hole Pressure Gauge
- G. Lozano (Shell Oil Co.) | W.A. Harthorn (Shell Oil Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- February 1959
- Document Type
- Journal Paper
- 26 - 30
- 1959. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 4.1.5 Processing Equipment, 4.3.4 Scale, 4.1.2 Separation and Treating, 2.2.2 Perforating
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Maihak bottom-hole pressure gauges have been field tested in three wells in the San Joaquin Valley, Calif. These are the first known installations of this surface-indicating gauge in the U. S. although it has been used several years in Europe.
The gauge, manufactured by the H. Maihak Co., Hamburg, Germany, consists of a transmitter located at the bottom of the tubing and a receiver at the surface. The signaling circuit consists of a single conductor wire strapped to the outside of the tubing and the tubing itself. Measurements have been made successfully as deep at 6,885 ft. Fig. 1 is a schematic diagram of the system. The gauge appears accurate and reliable and should be a useful addition to the tools of the petroleum engineer.
Bottom-hole pressure is one of the most valuable tools of the reservoir engineer. To a lesser degree it is also valued by the production foreman, mechanical engineer and others responsible for efficient production of oil. Existing instruments to measure bottom-hole pressure, although accurate and reliable, have serious limitations. With certain exceptions they are not equipped to telemeter data from the bottom of the well and their utility therefore is limited to occasional measurements. In addition, the high cost of running and retrieving the instruments sometimes discourages their use. This is particularly true in pumping wells where rods or tubing must be pulled to run and retrieve the instruments. A definite need has existed for pressure instruments which will continuously, or on demand, telemeter their data from the well without pulling rods or tubing. The successful development and application of such instruments should open new horizons to reservoir and production engineers and more efficient development and production practices will almost certainly follow. When we learned that the Maihak bottom-hole pressure gauge had been successfully applied in European oil fields, we obtained several for testing. The purpose of this paper is to report on tests made at three wells in the San Joaquin Valley and to make the equipment known to the domestic oil industry.
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