METHOD OF HYDRO-DYNAMIC SURVEY IN WELL EQUIPPED WITH ELECTRIC-CENTRIFUGAL PUMP INSTALLATION Russian patent published in 2009 - IPC E21B43/00 E21B47/00 

FIELD: oil and gas production.

SUBSTANCE: method of hydro-dynamic survey in well equipped with electric centrifugal pump installation with frequency-controlled drive and assembled on mobile vehicle consists in hydro-dynamic survey of wellhead parameters of well and fluid in well by means of steady-state sampling, in determination of ratio of bed productivity at various bottomhole pressure and in determination of ultimate stress of fluid shear. Control and program complex is applied for control and automatic recording of wellhead parametres of well in digital form. Coefficient of bed productivity and ultimate stress of shear are determined by at least any three frequencies of feeding voltage: 40±2, 45±2, 50±2, 55±2 and 60±2 Hz; further pressure and temperature are measured at a bumper with dynamic level of fluid in annular space of the well and density of wellhead samples of fluid and yield. Ultimate stress of fluid shear is determined by re-calculation of measurement results into bottomhole pressure and with a diagram in rectangular coordinate system in plane where values of bottomhole pressure are shown on Y-axis, while values of yield are shown on X-axis, with an indicator diagram of dependence of yield from bottomhole pressure, with extrapolation to Y-axis, point of intersection with which shows value of bottomhole pressure; entry of bed fluid into well does not occur at exceeding values.

EFFECT: reduced expenditures for hydro-dynamic surveys in well, increased overhaul time of underground equipment operation due to its optimal selection on base of obtained data.

5 cl, 3 dwg