FIELD: running and repair of oil wells. SUBSTANCE: hauling chain to sink and lift continuous steel pipes has friction blocks. Each friction block is provided with insert block made of four parts, two parts being made of steel and two part being made of composite material. Steel components of block are placed on edges of friction block and two others are arranged between them. Carbon plastic is used in the capacity of composite material. Areas of surface of steel components of blocks relate to that of surface of components made of composite material as 1:1.5. EFFECT: provision for high pulling effort of friction blocks in the course of all period of usage of long-length pipe. 3 cl, 3 dwg
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RU2340805C1 |
