The Artizan . ew channels in other directions, andfound vent in other wells. It is not an uncommon thing for intermittent wells to throw outat first 300 or 400 barrels a day, or to yield in all as much as20,000 barrels. They sometimes run two or three years before productiveness of the Lewellyn well on the Little Kanawha greatlyexceeded these figures. It is evident that if a second well were sunk so as to enter thecavity B or I), fig. 2, the well C would loie one portion of its supplyof gas and oil, and be to this extent interfered with. Sometimes a veryproductive well thus cuts
The Artizan . ew channels in other directions, andfound vent in other wells. It is not an uncommon thing for intermittent wells to throw outat first 300 or 400 barrels a day, or to yield in all as much as20,000 barrels. They sometimes run two or three years before productiveness of the Lewellyn well on the Little Kanawha greatlyexceeded these figures. It is evident that if a second well were sunk so as to enter thecavity B or I), fig. 2, the well C would loie one portion of its supplyof gas and oil, and be to this extent interfered with. Sometimes a veryproductive well thus cuts oil the main supplies of a number of less con-siderable ones in its neighbourhood, or, if the first sunk, it is itself tappedby them. But some of the most marked cases of interference that are known,show the existence of a third class of oil cavities, connected with oneanother by perfectly free channels of communication, so that when theequilibrium between them is disturbed, it is immediately restored. Fig. 3. will serve to illustrate, A well, A, enters tin- cavity 1), finding well B is bored -> as to enter an open channel g between cavities I) and E. This will drain oil from A; but if, as iu the figure,its month is lower than that of A, it can be made a valuable auxiliaryto it when the rising water drives tie- oil into the upper part ofthe cavity; lor it, can lie used to reduce tie- water, and thus to keep tieoil within reach of A. Again, a third well C is bored, and passes through a strong anrrentofwater, a cro-s section f which is represented by I-. It Anally descendsto a fissure II, which communicates freely with E, and consequently aliowith 1), and interferes with both the other wells by letting in inch ahead of water as to drive the oil in both cavities above the months of thetubes. Pumping the water out of all these simultaneously might bring the oil down again within reach of that tube at least which enters at thehighest point. A better expedient
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