A Simple Low Cost Method for Determining the P.I. of High Gas-Oil Ratio Pumping Wells
- David W. Deax (Amerada Petroleum Corp.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- December 1972
- Document Type
- Journal Paper
- 1,417 - 1,422
- 1972. Society of Petroleum Engineers
- 3.1 Artificial Lift Systems, 5.3.2 Multiphase Flow, 3.1.1 Beam and related pumping techniques, 4.1.4 Gas Processing, 5.2.1 Phase Behavior and PVT Measurements, 3.1.6 Gas Lift, 2.2.2 Perforating
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Discussion of this paper is invited. Three copies of any discussion should be sent to the Society of Petroleum Engineers Office. Such discussions may be presented at the above meeting and, with the paper, may be considered for publication in one of the two SPE magazines.
Determining productivity index (PI) is a problem that confronts operators in many areas problem that confronts operators in many areas where beam units are used. With sucker rod pumping, it is not uncommon for equipment to pumping, it is not uncommon for equipment to be over or under designed because of a lack of productivity information. This paper describes a simple, low-cost technique for determining the PI of a pumping well which will be referred to as the "shut-in annulus" test. The method is especially useful in areas where gas and foam limit the use of conventional fluid level techniques. A two-pen recorder is used to measure tubing and casing pressure, permitting an accurate estimate of working pressure at pump depth. Using this information along with data on static pressure, producing rate, and gas-oil ratio, the PI can be calculated.
A comparison of calculations by this method to measurements with bottom-hole pressure gauges was made, and the results pressure gauges was made, and the results showed that the "shut-in annulus" test gives a reliable estimate of PI. A group of deep, gaseous pumping wells was then tested using this technique. No productivity information was available at the time of testing, but all of the wells were suspected of having additional producing capacity. PI's were calculated and changes in production equipment were made to satisfy the requirements of individual wells. Based on the results of testing, it is concluded that the method gives a reliable estimate of PI, and it has consistently proven to be a good "yard-stick" for production purposes. production purposes
Accurate productivity index (PI) information is needed to design artificial lift equipment and its importance is increased where there are no allowable restrictions. Many methods with varying accuracy are used to find the PI of beam pumped wells. A common method is to fix the working fluid level using a well sounder and calculate flowing bottom-hole pressure with an estimated gradient; however, gas, foam or paraffin frequently cause erroneous results. Another method is to run a gauge below the pump to record pressure while the well is produced. This procedure is not widely used because of time and expense.
This paper describes a simple, low-cost technique (called the "Shut-In Annulus Test") for determining the PI of a pumping well.
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