Determination of Oil-well Capacities from Liquid-level Data
- Charles C. Rodd (Gulf Oil Corp.)
- Document ID
- Society of Petroleum Engineers
- Transactions of the AIME
- Publication Date
- December 1943
- Document Type
- Journal Paper
- 48 - 56
- 1943. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 4.1.2 Separation and Treating, 4.3.4 Scale, 4.1.5 Processing Equipment, 5.6.4 Drillstem/Well Testing, 2.2.2 Perforating
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Prior to 1938, proration procedure in Kansas required the physical testingof wells in order to set up a basis for allocating production. Subsequently theuse of liquid-level data and bottom-hole pressure data was authorized oncertain types of wells as a basis for calculating well capacities, therebypermitting wells to be tested at low rates and with small volumes ofproduction.
This paper gives some attention to the equipment used for obtainingliquid-level data but in general it is devoted to the theoretical and physicalfactors involved in well testing by drawdown methods. These tests are dividedinto two classifications: (I) liquid-level data used directly to calculatecapacities, and (2) liquid-level data and liquid-level measuring equipment usedin connection with other data to determine bottom-hole pressure. Equations andcalculations for both types are shown.
Well capacities calculated from fill-up data have not been used generallybut offer a simple means of testing some wells. Theoretical factors andcalculations for such tests are shown.
In the state of Kansas, proration laws required that the "ability of awell to produce" be given consideration in state allocation orders and formany years this was the only factor used in prorating the allowed oil. The"ability of a well to produce" was the quantity of oil that could beobtained from a well in a prescribed period, usually 24 hr. Early in thehistory of State-regulated proration, Kansas operators realized that, unlesssome restriction were placed upon equipment, the competition between producersto obtain large well "potentials" might result in a race to install thelargest pumping equipment. Consequently, restrictions were placed upon the sizeof tubing and length of pump stroke that could be used in pumping wells duringpotential tests. Later, restrictions were placed also upon the size of tubingand chokes that could be used in flowing walls.
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