Apparatus for providing ducts through casing in a well

摘要: 995,517. Wells &c. NATIONAL PETROLEUM CORPORATION Ltd. Dec. 11, 1963, No. 48917/63. Heading E1F. A device for forming a duct through the wall of casing 14 comprises body 20 adapted to be fixed in wall, duct-forming bellows 25 at one end body, and destructable closure 27 other permit fluid pressure extend bellows. number devices each having 30 are screwed into which is then lowered well 10. Cement 15 followed by plug 17 pumped surround lower part casing. The fluid, preferably acid remove closures either applied interior or chemical action, combination action. Pressure devices, when cement has set removed action connect oil bearing strata 12. U.S.A. Specification 2,775,304 referred to.