| 摘要 |
FIELD: oil-and-gas industry. ^ SUBSTANCE: invention relates to oil industry and may be used in well cleanout. Proposed device comprises scraper and filter fitted on casing string and check valve arranged inside said string above said filter. Said filter is composed of three perforated tubes with plugged bottom and arranged concentrically. Outer tube features nominal diameter of 88.9 mm, medium tube features diameter of 73.0 mm, and inner tube features diameter of 60.3 mm. Note here that outer tube punched hole diameter makes 5 mm, those of medium tube and inner tube make 4 mm and 2 mm, respectively. ^ EFFECT: higher efficiency of cleaning. ^ 1 dwg |
