| 摘要 |
FIELD: mining.SUBSTANCE: in a casing string centraliser with varied geometry, comprising a vessel and centralising elements from elastic material rigidly fixed on the vessel, having an inner cavity, arranged along a spiral on the vessel surface. The inner cavity of the centralising elements is filled with a water-swellable polymer, and external side faces of the elastic centralising element are arranged as semi-permeable.EFFECT: development of a centraliser with varied geometry for a casing string, having minimum diametre for lowering of a string into a well and maximum after its lowering and when cementing an inclined or a horizontal shaft.11 dwg |
