The Importance of Reliable Data in Gas-Condensate Recovery Calculations
- R.F. Hinds (Core Laboratories Inc.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- November 1958
- Document Type
- Journal Paper
- 60 - 62
- 1958. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 4.1.2 Separation and Treating, 5.2.1 Phase Behavior and PVT Measurements, 4.1.9 Tanks and storage systems, 5.2 Reservoir Fluid Dynamics, 5.8.8 Gas-condensate reservoirs, 1.6 Drilling Operations, 4.6 Natural Gas, 5.6.4 Drillstem/Well Testing, 4.1.5 Processing Equipment, 5.7 Reserves Evaluation
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With the continued deep drilling of today, increasing numbers of high pressure and high temperature gas-condensate reservoirs are being discovered. Correspondingly, the ranges of properties of gas-condensate reservoir fluids are also being increased. The literature contains several excellent reviews of the property ranges in presently known condensate reservoirs. When one examines these property ranges, it becomes apparent that the need for reliable data is great if the engineer is to evaluate properly or appraise a gas-condensate reservoir.
It is the purpose of this paper to present phase-behavior data that will point out some of the important variables that influence recovery from gas-condensate reservoirs produced by pressure depletion. All these variables may be resolved into two major categories: the hydrocarbon composition of the reservoir fluid and the physical properties of the reservoir. But the variables which we will consider are those which are usually determined from well tests shortly after discovery and are, consequently, readily available to the engineer. They are as follows: (1) the producing separator gas-stock-tank liquid ratio, (2) stock-tank liquid gravity, and (3) reservoir temperature.
Laboratory depletion studies have been performed on several reservoir fluids to illustrate the effect of changes in the considered variables upon ultimate recoveries. The deviation factors, Z, of a series of reservoir fluids were determined experimentally to illustrate their order of magnitude and their effect upon the calculation of in-place reserves existing at high pressures and temperatures, The procedures followed in conjunction with the performance of these studies and their associated calculations are illustrated in Fig. 1. For the purpose of this paper, the depletion recoveries are expressed only in terms of per cent of initial stock-tank liquid, with the abandonment pressure assumed to be 500 psig.
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