Treating tool with spring-induced force shifting indexing mechanism

摘要

A tubing conveyed multi-position well treating tool having a tubular housing 16 and a tubular inner member 30 which are relatively positionable at "Set", "Treat", "Dump" and "Release" positions actuated by a mechanical indexing mechanism. The indexing mechanism is loaded by a spring 54, such as a compressed gas spring or mechanical spring, which urges the tubular housing 16 away from the tubing connection of the inner tubular member 30, thus requiring no set-down forces for tool actuation or indexing. The treating tool is anchored within the well casing by hydraulic pressure actuated buttons 58, thus eliminating the typical requirement for anchoring actuation by set-down forces. The treating tool is sealed within the casing by pressure energized packers 22, 24 which are activated by the hydraulic pressure of fluid supplied from the tubing. The tool provides a bypass passage 98 to allow communication of the zones above and below the tool while isolating the straddled interval to be treated.