METHOD OF CONTROLLED INJECTION OF LIQUID THROUGH FORMATION (VERSIONS) Russian patent published in 2017 - IPC E21B43/14 E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: invention can be used in simultaneous-separate quench (SSQ) of liquid in one or several formations of a well. An arrangement of underground equipment (UEA) is lowered into the well, according to the first version, it is equipped with a plug, a pressure equalisation valve, an above-packer safety unit, lower and upper well chambers representing injection distributing devices (IDD) and provided with removable union elements, the liquid is supplied to tubing cavity, the flowmeters are lowered on geophysical cable and liquid consumption of the upper layer is calculated as difference between measured total flow rate of liquid for two formations and flow rate of lower formation, the geophysical cable is lifted. According to the second version, the UAE is equipped with the pressure equalisation valve, the above-packer safety unit, the lower and upper well chambers, the lower and upper IDD are placed without removable union elements under the lower and upper packers, respectively, at that the removable piece element of the lower well chamber is made with geophysical cable sealing, on the wellhead the geophysical cable is equipped with an upper instrument and laid successively through the upper and lower extracted union elements, the geophysical cable is sealed in the lower union element, then the lower instrument is set in the lower part of the geophysical cable, the upper and lower removable union elements are lowered and installed in series into the body part of corresponding IDD, the fluid is supplied to the tubing cavity, geophysical surveys are carried out.

EFFECT: possibility of levelling the under-packer and inter-packer pressures, successive extraction of the upper and then the lower packers in case of a tack, ease of changing the volumes of the fluid injection, performing geophysical surveys of the well in continuous mode, or if necessary.

2 cl, 4 dwg