METHOD FOR INVESTIGATION OF INJECTION WELLS Russian patent published in 1998 - IPC

FIELD: detection of disturbed sealing of flow string in injection wells with no tubing. SUBSTANCE: measurement and registration of temperature are carried out along well bore in injection and in the course of changing over from injection to stationary conditions of fluid withdrawal with some time interval, and obtained thermograms are compared. In each interval of detected temperature anomaly, two additional measurements are carried out. In this case, the first measurement is carried out at quasi-stationary distribution of temperature in well bore in course of injection. After shut-in of well and ceasing of injection, the second measurement is carried out for not more than 2-5 min. Disturbed sealing of flow string is detected by the form of temperature anomaly in the first and second measurements or by absence of anomaly during the first measurement and by the presence of anomaly during the second measurement. EFFECT: higher accuracy in detection of points of disturbed sealing of flow string. 1 dwg