FIELD: oil industry.
SUBSTANCE: invention relates to oil production, in particular, to the methods of hydrodynamic well tests (hereinafter HWT) in exploitation well in the process of oil extraction. Hydrodynamic well test of formation involves arrangement of downhole pumping equipment in well, which consists of a string, a pump unit, locking device connected to the pump unit directly or by means of a shank. Locking device operates as a conventional non-return valve, designed with option of being shut off by placing a fluid column in annular space of the height which provides pressure above the locking device invariably higher than expected formation pressure of the deposit. Locking device is configured to provide separation of below-packer zone of the well production string and above-packer zone of the well production string, including annular space and the string volume. Pressure gauge is placed below the locking device outside or inside the string, above or below the packer which is installed as close as possible to the deposit, but above it. After disconnection of the pump unit and shut off at the mouth of annular and tubular space the locking device is closed to prevent ingress of formation fluid from the deposit in the above-packer zone of the production string, including annular space and the string volume, and the pressure gauge readings on the rate of change of bottomhole pressure in time are recorded. Then, upon hydrodynamic tests, by the results of pressure gauge recorded readings, the pump unit is started, the liquid previously placed in annular space is pumped out with simultaneous opening as a result of pumping of the locking device and further operation of the well. Distance between said locking device and packer not exceeds 100 m. According to the second version, electrically driven valve is used as locking device, its closing and opening is carried out by electric signal from the mouth via the cable, or valve which closing and opening is carried out by hydraulic signal from the mouth by means of capillary tube. Then the said valve is opened with further start of pumping unit in operation.
EFFECT: technical result is providing high quality HWT, expanded interpretation of the obtained results at simultaneous reduction of time analysis for removal of formation pressure recovery curves in production wells, mainly in poor wells running reservoirs of complex structure heterogeneous, separated, and to a greater degree carbonate reservoirs.
11 cl, 5 dwg
