METHOD FOR DISTURBANCES DETECTION IN EXPLOITATION WELL CASING STRING Russian patent published in 2008 - IPC E21B47/10 

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to a petroleum industry and can be applied at disturbances detection in an exploitation well casing string. It provides possibility of definition of disturbances of a well casing string at an early stage at their rather idle appearance. Essence of invention: the method includes definition of qualitative and quantitative structure of firm suspended particles and structure of in passing mined water on a hole mouth, calculation of concentration of the salts mixture containing in waters, arriving in a hole from various sources, calculation of time of the termination of the firm salts formation reaction formed at mixture of different waters, definition of time of fluid lifting on a wellbore, comparison of two these times. If time of the termination reaction is shorter than time of lifting the concluding about disturbance presence in a casing string is made, and if it is longer - about mixture of waters on a bottom-hole and absence of a casing string disturbance, thus a place location of disturbance is estimated at salt types from various horizons.

EFFECT: definition of disturbances of a well casing string at an early stage at their rather idle appearance.

1 ex, 1 dwg