PACKER FOR SHUTOFF OF PIPE STRING HOLLOW

摘要

FIELD: well drilling and overhaul; may be used in isolation of formations or intrapipe space. SUBSTANCE: packet has hollow body with recess 4 receiving upper end of sealing member 5 which has axial channel 6 where partially inserted is distance plug 7 from easily drilled material. Body 1 has connector 11 with holes 12. Secured to connector is upper end of rod 10 and its lower end is connected with distance plug 7 by means of shear pin 9. Upper end of sealing member 5, wall recess 4 and lower end of connector 11 form hydraulic chamber which is communicated with hollow of pipe string 3 through holes 12. Pressure built-up in pipe string pushes sealing member 5 from recess 4 of body 1 to move it onto distance plug 7. Then, by tensioning pipes 3 distance plug 7 is additionally pulled into axial channel 6 of sealing member 5 by deforming it up to tight pressing to wall of tubing or well. Further tensioning of pipe string 3 results in shearing of pin 9 and body 1 with rod 10 are lifted from the well. Upon completion of the work in well, sealing member 5 and distance plug 7 are drilled out. EFFECT: simplified design and increased serviceability.