METHOD FOR SEPARATION OF HORIZONTAL WELL INTO SEPARATE SECTIONS Russian patent published in 2017 - IPC E21B29/10 E21B33/10 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil and gas industry, namely to methods for isolation of zones of drilling problems during drilling and workover. The method includes determination by geophysical studies of the length and the location of separation zones, lowering on the pipe string of the profile disconnetors with cylindrical ends, each of which is placed in the central bore between the upper and lower stops. The central hole inside each disconnector is additionally provided with a nipple and an electric valve and each disconnector in the middle part - with the cylindrical section for the nipple with a calibrated narrowing located aside the bottomhole. Below the central hole is equipped with a shoe with a check valve, and the lower of the disconnectors below the shoe - with the cylindrical bushing with side holes, calibrated internal diameter and lower stop. After discharge the excess pressure inside the disconnectors is provide through electric valves, and after sealing and fixation in the interval of installation the drill string is lowered down to the shoe stop to the lower stop. Nipples are hermetically arranged in calibrated narrowings and the shoe - in a cylindrical bushing below lateral holes. interconnection with the space below releasers is implemented through electric valves, which are opened and closed by electric signals from the wellhead if necessary.

EFFECT: decrease of time costs by eliminating of additional round-trip operations.

2 dwg