METHOD OF CHECKING FOR TIGHTNESS OF INJECTION WELL EQUIPPED WITH TUBING Russian patent published in 2001 - IPC

FIELD: oil and gas producing industry; applicable in detection of points of disturbance of flow string tightness of injection wells. SUBSTANCE: method includes withdrawal of fluid from well and its injection back into annular space. Prior to withdrawal of fluid, first background temperature value of well is determined along its bore after preliminary stopping and restoration of quasistationary regime. In this case, fluid is withdrawal in amount equalling up to one volume of wellbore by portions of equal volumes. Withdrawn fluid is injected into well using procedure the same as in its withdrawal. After each withdrawal and injection, variations of temperature along wellbore is registered by moving thermometer inside tubing. Obtained thermograms are compared with background value of well temperature. EFFECT: higher accuracy of checking and obtained confident results. 1 dwg