| 摘要 |
FIELD: oil and gas industry.SUBSTANCE: downhole tool includes a tubular body, a swelling element located around tubular body, and at least one O-ring located around tubular body between tubular body and swelling element, and is harder than the swelling element.EFFECT: prevention of undesired leakage of downhole fluid medium and improvement of retaining and sealing abilities of downhole tool.20 cl, 4 dwg |
