| 摘要 |
FIELD: oil field geophysical works, particular, detection of wells subject to immediate repairs involving isolation of formations. SUBSTANCE: method for determination of casing string- borehole annulus crossflows in oil and gas wells is based on registration of noise amplitude in casing string within frequency range of 10-1000 Hz in form of graphs of noise process by vertical vibration geophone installed on wellhead flange of casing string. Registration is carried out repeatedly: in stationary injection of water into well, after stopping of injection at the wellhead, and after repeated engagement of injection. Then, noise amplitudes are compared which are registered at different conditions, and if abnormally high amplitude persists after stopping of injection, and if noise amplitude rises after repeated injection relative to amplitude in primary stationary injection it is indicative of existence of casing string-borehole annulus crossflows outside of the perforated object. Use of the offered method results in reduction of time required for testing one well down to 1.1.5 n. EFFECT: higher productivity of work in detection of wells with casing string-borehole annulus crossflows out of the object of perforation. |
