Wash tool for well having perforated casing

Details Wash tool for well having perforated casing Wash tool for well having perforated casing

1988-06-16

1989-03-28

Novosad, Stephen J.

Wells

Processes

Cleaning or unloading well

166186, 166187, 166191, E21B 33127

Patent

active

048155381

ABSTRACT:
A washing tool (24) attached to the lower end of a pipe string (18) includes a mandrel (28) between upper and lower subs (30, 32). The mandrel (28) has opposed spaced end sections (54 56) connected with an intermediate section (58). Each end section (54, 56) has a fluid inflatable elastomeric packer (64) thereon inflatable at a relatively low fluid pressure, and intermediate section (58) has a leaf spring (86) over a port (84) which is opened by outward movement of the leaf spring (86) at a second higher predetermined fluid pressure within the pipe string (18).

REFERENCES:
patent: Re31842 (1985-03-01), Weitz
patent: 2602516 (1952-07-01), Gray
patent: 2764244 (1956-09-01), Page
patent: 3059699 (1962-10-01), Brown
patent: 3280916 (1966-10-01), Barrington
patent: 3430701 (1969-03-01), Canada
patent: 3456725 (1969-07-01), Hatch
patent: 4030545 (1977-06-01), Nebolsine
patent: 4279306 (1981-07-01), Weitz
patent: 4311314 (1982-01-01), Suman
patent: 4484625 (1984-11-01), Barbee
patent: 4498536 (1985-02-01), Ross et al.

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