FIELD: oil production industry, particularly to centralize pipe strings in oil wells, namely centralizers and protectors having friction reducing rollers.
SUBSTANCE: centralizer comprises locating member, support members and axes with friction reducing rollers arranged on the axes. Locating member is made as two locating rings. Support members are formed as resilient bars with ends connected to location rings. Resilient bars define boxes in cross-sections of medium parts thereof. Bottoms of the boxes have at least two slots to expose rollers. Roller axes are installed in orifices formed in box sides. Gap is formed between sides of resilient bar boxes and pipe to which centralizer is connected when centralizer is in unloading state.
EFFECT: reduced material consumption and, as result, decreased cost of the centralizer.
2 cl, 2 dwg
| Title | Year | Author | Number |
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RU2215863C1 |
