ALTHOUGH the opinion has prevailed for several years that bottom~ hole choking under certain flow conditions should effect an increase in flow efficiencies, the use of bottom-hole chokes until recently has been limited in application mainly because of mechanical difficulties encountered in their construction, Within the past year, however, bottom~hole chok~ ing, through the development of a removable type of choke, has been applied successfully under various conditions of flow in many Mid~Conti nent fields.' The observation of these field tests indicates that bottomhole choking, although not applicable to all flow conditions, has an important place in the operation of oil and gas wells.This paper gives briefly the conclusions drawn from the data obtained from the e~periments with this bottom-hole choke under various flow conditions, and a description of the choke and its operation.
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