FIELD: oil-and-gas industry.
SUBSTANCE: set of invention relates to circular web systems for expansion in ring-like space between well tubular structure and wellbore inner wall. Circular web comprises tubular section of the well. Expanding coupling covers said tubular section and has inner surface facing said tubular section. Note here that every end of expanding coupling is connected with connecting section connected with tubular section. There is the space between coupling inner surface and tubular section. The element is connected with said coupling. Note here that said element has first and second sections located nearby said inner surface. Note also that element first section is secured to said inner surface. Note that second section extends into said space from first section.
EFFECT: higher hardness of said coupling.
19 cl, 27 dwg
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