Patent · US Expired

Surface controlled subsurface safety valve

US4667736A · kind A · utility

44Cited by
10References
19Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMay 24, 1985
Grant dateMay 26, 1987
Priority date
Expiry dateMay 24, 2005

Classification

  • Technology area (CPC E)Fixed Constructions
  • CPC primaryE21B34/16
  • WIPO fieldCivil engineering
  • WIPO sectorOther fields

Abstract

A pilot valve system for a subsurface safety valve operated by control fluid pressure from the surface including a pilot valve connected with the control fluid line to the subsurface safety valve and into the well production string immediately above the safety valve to bypass the control fluid pressure directly into the tubing string and dump the control fluid pressure from the subsurface safety valve into the tubing string directly above the valve to minimize the time delay between control fluid pressure reduction and the safety valve closure. Three embodiments of the pilot valve are disclosed. One embodiment is operable by electrical energy from the surface. The other embodiments are operable by acoustic energy and radio waves, respectively. Also disclosed is a minimum backlash latch assembly for releasably locking the pilot valve, or other well tools, along a well bore in a receptacle such as a side pocket mandrel.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.