Title:
【発明の名称】下げ穴ダンプ弁
Document Type and Number:
Japanese Patent JP2002514703
Kind Code:
A
Abstract:
An operator controlled, selectively actuatable downhole dump valve assembly (22) for selective draining of pumping liquid from a producing oil well, sectionalized downhole pipe string (18). The assembly (22) includes a tubular pipe section (24) having endmost threading (34, 38) and a dump valve rupture disc fitting unit (26); the fitting unit (26) includes a metallic, concavo-convex disc (50) with preformed lines of weakness (52, 54) on one face thereof. The section (24) is interconnected between a pair of lower pipe sections (20a, 20b). In operation when it is desired to elevate the string (18) from the well, the fluid within the string (18) is pressurized sufficiently to rupture the disc (50), thereby allowing fluid within the string (18) to drain. The string (18) and other well components can thereby be removed from the well without contamination owing to spillage from the tubular string (18).
Inventors:
Boulis Mark A.
High Blur Donald Earl. Junior.
High Blur Donald Earl. Junior.
Application Number:
JP2000548588A
Publication Date:
May 21, 2002
Filing Date:
April 14, 1999
Export Citation:
Assignee:
FIKE CORPORATION
International Classes:
E21B34/06; E21B34/10; F16K17/16; (IPC1-7): E21B34/10
Attorney, Agent or Firm:
Nobuto Watanabe (1 person outside)