The Artizan . l be sunk so as to enter the gas in thechamber N, the oil in M will immediately sink to the level of that in N,and be lost to the first well, a mode of interference which sometimesoccurs, when two wells are quite near together. Thus far have I have considered only isolated oil cavities, or those which,when exhausted, are not replenished to any considerable extent from othersources. In general these run their course in a short time, and yet theysometimes yield very large quantities of oil. There is a second class of wells, in general more productive, whichexhibit the same phenomen
The Artizan . l be sunk so as to enter the gas in thechamber N, the oil in M will immediately sink to the level of that in N,and be lost to the first well, a mode of interference which sometimesoccurs, when two wells are quite near together. Thus far have I have considered only isolated oil cavities, or those which,when exhausted, are not replenished to any considerable extent from othersources. In general these run their course in a short time, and yet theysometimes yield very large quantities of oil. There is a second class of wells, in general more productive, whichexhibit the same phenomena at first, but as often as they are exhausted arereplenished again, and repeat a certain series of actions indefinitely, andwith remarkable regularity of time. This is to be explained by supposingthat they are connected with other reservoirs by slight channels of com~munication, whose capacity for replenishing is less than that of the tubefor exhausting. Let C, fig. 2, be an oil cavity having connections with. two other cavities, B and D. Suppose that a well A enters the oil in this well has thrown out oil, and, perhaps, afterwards water, by forceof the condensed gas, it comes to a stop. Then owing to the diminishedtension of the gas in the large space in C, the gas and oil in B and Dforce slight passages, represented by the dotted lines, into C, until thegas in this cavity again becomes sufficiently compressed to raise oil andwater successively; after which the well comes to another stop nntil it isreplenished with oil and gas as before; and the same process is repeatedan indefinite number of times. The Newton well, on a branch of theLittle Muskingum, a few miles from Marietta, repeats this process (withsome escape of gas) at regular intervals of about half-an-hour, expellingabout a barrel of oil each time. A noteworthy fact connected with thiswell is that when it stops it is necessary to pump out a little water inorder to start it again; then the oil issues spontaneo
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