FIELD: well drilling. SUBSTANCE: movably installed in device body are two bushings. Accommodated in inner bushing is valve made in form of sleeve spring-loaded relative to outer bushing. Sleeve has ports in its wall. Sleeve and outer bushing have spring-loaded retainers, and inner bushing has annular recess for their arrangement on its inner and outer surfaces. Device provides for performance of repeated press-testing without lifting drill pipe string to the surface. EFFECT: higher efficiency. 1 dwg
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SU866112A1 |
| PACKER | 0 |
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SU1760083A1 |
