METHOD FOR DETERMINING BEHIND-CASING FLOWS Russian patent published in 2014 - IPC E21B47/10 

FIELD: oil and gas industry.

SUBSTANCE: as per the proposed method a well is equipped with a pipe string with a swab. The string bottom is arranged below perforated interval of a productive formation. The well is equipped with a bottomhole thermometer on a cable in annular space. The swab is lifted via the pipe string and at the same time, the bottomhole thermometer in a recording mode is lifted via the annular space on the cable. During the swab lifting there is the change of liquid flow direction in the well from direction from the productive formation in an upward direction of the well at oil production, for direction from the productive formation in a downward direction to the pipe string column. Operations are repeated; thermograms are recorded at the changed direction of well fluid flow; thermograms are analysed and compared to the thermogram of the killed well. On thermograms at the changed direction of well fluid flow there indicated is rise of temperature at the investigated interval. It is assumed that behind-the-casing flows are available in a downward direction from overlying to underlying formations. A conclusion is made on flow of the fluid from the overlying formation in the direction of behind-the-casing flows to the perforated interval.

EFFECT: determination of the behind-the-casing flows at downward flow of fluid behind the well.

1 dwg