METHOD FOR DETECTION OF OIL OR OIL PRODUCT LEAKS FROM PIPELINE Russian patent published in 2010 - IPC F17D5/02 

FIELD: oil and gas production.

SUBSTANCE: controlled linear section of pipeline is broken into two neighbouring segments and with the help of pressure sensors arranged at the ends of each one, pressure losses for friction are measured (hydraulic slopes of each segment), which are used to detect mass flow rates of liquid at each segment G_1-2(i_1-2),G_2-3(i_2-3), and periodical control of mass flow rates unbalance value is carried out in expression G_1-2(i_1-2) - G_2-3(i_2-3) = |ε_th.|, where ε_th. - threshold value of liquid flow rates unbalance, detected by parametres of pumping in regular mode (prior to leakage), and mass flow rates are detected using formulas - for area of smooth friction; - for area of mixed friction. Where A = g·(ρ·π)^1.75·d^4.75· 4^0.25; В = 0,3164·8·ν^0,25; p - density of liquid, kg/m³; d - pipe diametre, m; v - kinematic viscosity of liquid, m²/s; P - pressure, H/m²; z - geodesic mark, m; L - length of pipeline (segment), m; g - free fall acceleration, m²/s; k - coefficient of pipe roughness; i - hydraulic slope, m/m; "n", "k" - indices of the beginning and end of controlled segment - for the first segment "1-2", for the second segment "2-3".

EFFECT: increased efficiency of method by simplified detection of leak point with no information in liquid flow rate at determined section.

2 cl