METHOD OF INVESTIGATION OF LEAKTIGHTNESS OR LEAKINESS OF PACKER SYSTEM AND CEMENT BRIDGE OF WELL Russian patent published in 2013 - IPC E21B47/10 E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: method involves lowering of at least one or several packer systems on tubing string and this system installation in injection or piezometric, or flowing, or gas-lift or pump well either above formation interval and/or between formation intervals, or between formation intervals and leakiness, or above or below intervals of leakiness. Each packer system is equipped with one or two packers and is made with two sets of sealing cups between which pressuring unit is located. Measuring device - self-contained flow-metre or geophysical instrument is lowered to tubing string and is held at depth below and above pressuring unit of packer system. Flow rate of medium - supplied liquid or produced fluid - is measured. If their values exceed allowed limits of measuring device, packer system is considered not tight as medium penetrates through its sealing cups. Otherwise it is considered tight. If packer system is leak-tight, but there is hydrodynamic connection between separated intervals in well, then the reason of hydrodynamic connection is considered leakiness of cement bridge between intervals behind production strings of well.

EFFECT: improving efficiency of investigation and detecting leaktightness or leakiness of packer systems or cement bridge.

5 dwg