METHOD OF LOWERING FILTER LINER INTO WELL WITH LARGE DEVIATION FROM VERTICAL Russian patent published in 2024 - IPC E21B43/10 

FIELD: oil and gas industry.

SUBSTANCE: method for lowering a filter liner into a well with a large deviation from the vertical. The method of lowering a liner-filter into a well with a large deviation from the vertical includes lowering into the drilled well successively connected elements of the liner-filter equipment - a column shoe, a check valve, a filter isolation device, well filters with sealing plugs in the holes, alternating with casing pipes equipped with centralizers, hanging device. Descent into the filter liner of a section of small-diameter pipes with a stinger in the lower part to connect to the filter isolation device and carry out technological flushing through the column shoe. Connecting a section of small diameter pipes to a hanging device. Moreover, the specified combination of the components of the filter liner with small-diameter pipe sections forms a sealed cavity between the internal space of the filter liner and the small-diameter pipe section, filled with air, which ensures the buoyancy of the filter liner when descending to the bottom with a large deviation from the vertical. At the same time, the internal channel of the section of small-diameter pipes makes it possible to perform flushing using the method of direct circulation of drilling fluid while lowering the filter liner to facilitate its running in a horizontal wellbore. The filter liner is lowered on the transport string to the design depth, after which the well is washed, the suspension device is fixed in the production string, the transport string is uncoupled from the suspension device and removed from the well together with a section of small-diameter pipes.

EFFECT: use of a certain combination of standard components for lowering a filter liner into a well with a large deviation from the vertical, which ensures buoyancy of the string and facilitates its passage in a horizontal wellbore.

1 cl, 3 dwg