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Excerpt from Possible Causes of the Decline of Oil Wells, and Suggested Methods of Prolonging Yield The purpose of the petroleum technology investigations that are being conducted by the Bureau of Mines is to aid in extending more efficient methods in the production, handling, refining, and marketing of petroleum and its products. This paper deals with one feature of greater efficiency in production, since the decline of individual oil wells is the immediate or direct factor in the general decline of pro duction throughout all fields that have been discovered to date and will be in the decline of all future fields. The efficiency of the recovery of petroleum from its underground sources can be measured by the length of time during which economic production can be sustained in individual wells or groups of wells, the object being to leave in the sand when the well is finally abandoned the least possible percentage of the original petroleum content. The methods that by prolonging the life of wells are helpful in extracting the maximum amount of oil at minimum cost are brieﬂy summarized on the following pages. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.