SEAT POCKET SYSTEM WITH COLLET CHUCK AND METHOD OF HYDROCARBON FORMATION RUPTURE Russian patent published in 2020 - IPC E21B34/14 E21B43/12 E21B43/26 

FIELD: chemistry.

SUBSTANCE: invention relates to a seating seat system and a method of rupturing or treating a hydrocarbon formation. Seat pocket system comprises multiple mounting adapters with annular recesses with chamfers for serial hydraulic fracturing or treatment of formation. Annular hollow elements of seating seats provide seat for plug fit and are attached, each, to the transportation device. Annular hollow element comprises mounting surface, collet ledges with chamfers on outer side and inner through bore shifted in radial direction outward. Colgate pin of each element of seat pocket have different width and accordingly engage only with one ring groove of corresponding width in appropriate mounting adapter. In compliance with first embodiment, method includes installing casing pipe and multiple mounting adapters. First tubular element of the mounting seat is attached to the lower end of the transportation device and introduced into the casing string until engagement of the collet pin with the ring recess. Transport device is withdrawn causing release of tubular element of seat. Plug element is lowered or drained into casing string to prevent fluid passage under pressure. Fluid is injected into formation above plug element. Proposed element is pushed out of casing pipe. Extracting device is lowered till achievement of the lowest landing seat. Radial grippers are detached. Extracting device is pulled out together with each tubular element of the seat. According to the second embodiment, casing pipe of well and set of mounting adapters with multiple annular recesses are installed. According to the third embodiment, the tubular element of the seating seat and the plug element are drained downwards along the well bore.

EFFECT: technical result is simplification of the seat pocket system, optimization of the hydraulic fracturing process and preservation of the initial diameter of the well shaft.

19 cl, 16 dwg