×

Placement apparatus and method for low density ball sealers

  • US 4,194,561 A
  • Filed: 11/16/1977
  • Issued: 03/25/1980
  • Est. Priority Date: 11/16/1977
  • Status: Expired due to Term
First Claim
Patent Images

1. An apparatus for selective placement of ball sealers for fluid treatment of a well, said ball sealers having a density less than the density of said fluid, comprising:

  • a first tubular member,a second tubular member slidably mounted within said first tubular member,a first expandable diaphragm having a first frusto-conical section attached at the small diameter of said frusto-conical section to said first tubular member at one end thereof, said expandable diaphragm extending beyond said first tubular member,a plurality of pivotally mounted extendable arms mounted to said first tubular member toward the end of said first tubular member distal to said first expandable diaphragm, said arms each having a pinion thereon, each said pinion engaging a rack means within said first tubular member, said rack means abutting one end of said second tubular member and biased toward said second tubular member, said arms being retained in an unextended position by a first collar slidably mounted on said first tubular member over said arms,a retaining cap having means thereon to engage and retain said first expandable diaphragm in an unexpanded position,a push off member connected to said retaining cap and abutting the end of said second tubular member distal to said rack means and,means releasably holding said push off member in position.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×