METHOD OF INJECTION WELLS RESEARCH (VERSIONS) Russian patent published in 2000 - IPC

FIELD: thermal methods of injection well research. SUBSTANCE: method is used in detection of leaky points in tubings and casings within intervals overlapped by tubings and in detection of fluid motion behind casing strings. Method of research of wells provided with tubings includes recordings of temperature variation along wellbore in 0.5-5 h after changing over of it from conditions of quasistationary distribution of temperature in tubing in the course of injection to fluid withdrawal through tubing and performance of two measurements of temperature in each detected interval of temperature anomaly. The first measurement is carried out within time interval of not in excess of 2 min, and the second measurement, during 5-12 min after changing over of well from quasistationary distribution of temperature in tubing above anomaly in process of injection to fluid withdrawal through tubing. Leaky tubing is detected by kind of anomaly of temperature during the first measurement, and leaky casing is detected by absence of anomaly in the first measurement and presence of anomaly in the second measurement. Measurement by thermometer is carried out upon completion of injection in the course of temperature recovery without withdrawal of fluid from well. The other section of research method of injection wells provided with tubing includes recording of temperature variation along wellbore in 0.5-5 h after well changing over from conditions of quasistationary distribution of temperature in tubing above anomaly in the course of injection, to fluid withdrawal through tubing and performance of three time measurements of temperature in each detected interval of temperature anomaly. The first measurement is carried out after setting in tubing above anomaly of quasistationary distribution of temperature in the course of injection, and the second and third measurements are carried out during time not exceeding 2 min and in interval of 5-12 min, respectively, after changing over of well from conditions of quasistationary distribution of temperature in tubing in the course of injection to fluid withdrawal through tubing. Measurement by thermometer over entire wellbore and also the second and third time measurements ar carried out after stopping of injection in the course of temperature recovery without fluid withdrawal from well. Leaky tubing is detected by presence of anomaly during the second measurement, and leaky casing by absence of anomaly in the first and second measurements and presents of anomaly in the third measurement. EFFECT: higher adaptability to realization of the method and reduced cost of detection of leaky point in tubings and casings. 2 cl, 1 dwg