Publisher's Synopsis
Excerpt from Methods of Shutting Off Water in Oil and Gas Wells, Vol. 163
Water may gain access to an Oil-bearing formation from several sources - from water sands above or below those containing the oil, or by encroaching through the oil sands as the Oil is withdrawn. In short, it may enter a well from the top, bottom, or side. Such in gress of water is a most serious detriment to the recovery of oil from the ground.
As the art Of drilling and developing Oil properties has progressed, increasing thought, labor, and money have been expended on various methods, devices, and equipment for arresting the migration of water from its normal subsurface position into the porous strata contain ing valuable oil or gas accumulations.
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