METHOD AND DEVICE FOR RESEARCH AND OPERATION OF HORIZONTAL WELL WITH ZONES OF PERMEABILITY VARIATIONS Russian patent published in 2018 - IPC E21B43/00 E21B29/10 E21B43/14 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions refers to the oil and gas production industry, namely to the methods of development and operation of wells with zones of different permeability. Method includes drilling a horizontal well and cementing the casing. In the formation, zones with different permeability are determined. String of pipes is lowered into the well, from below, equipped with a check valve and packers from the outside, made in the form of patches, communicated with a string of pipes and installed taking into account the length of the zones with a corresponding permeability, one end of which is rigidly fixed to the pipe string, and the other is movable along the pipe string. Packers are installed after descent into the well by creating high pressure inside the pipe string and patches. Zones with different permeability are operated in sequence from the face to the mouth before the corresponding zones are watered, beginning with operation through a check valve, then after a series of perforations of the pipe string opposite the corresponding zone. Isolation of watered zones is carried out by installing a packer plug inside the pipe string before opening by perforating the next zone. Column of pipes after installation of packers is designed for successive perforation from the face to the mouth to open the corresponding zones after overlapping the previous opened by the encircled water zone with a stopper.

EFFECT: reduces the likelihood of emergencies due to exclusion of mechanical filter opening and closing operation, exclusion of narrowing of the inner diameter of the casing string and consequently, exclusion of difficulties when the tool is lowered into the well for carrying out technological operations, exclusion of additional lifting and lifting operations.

2 cl, 2 dwg