PROCEDURE FOR DETECTION OF WELLS WATERED WITH BEHIND-CASING CROSS-FLOWS OF WATER Russian patent published in 2011 - IPC E21B47/10 

FIELD: gas and oil production.

SUBSTANCE: procedure for detection of wells watered with behind-the casing cross-flows of water consists in measurement of output of liquid, its watering and production of oil, in analysis of dynamics of logarithm of water-oil factor (Ln WOF), in calculation of excessive watering and in detection of wells producing excess water. Also, calculation of excessive watering and detection of wells producing excessive water are carried out before outbreak of pumped or circuit water. The period before outbreak of pumped or circuit water is determined as a period before beginning of steady growth of dynamics of the Ln WOF. Excessive watering is calculated as difference between actual and accepted watering determined by initial water saturation of pay using the function of Backley-Leverette. Positive value of excessive watering indicates presence of behind-the casing cross-flows of water, where upon there are carried out geo-physical examinations at wells noting presence of behind-the casing cross-flows of water.

EFFECT: raised efficiency of procedure for detection of wells watered with behind-the casing cross-flows of water due to increased reliability and facilitation of large-scale examinations of wells at simultaneous coverage of all producing stock with examinations without special shutdown of wells for preliminary diagnostics.

2 cl, 4 dwg, 2 ex