Variable pressure pump through nozzle

Details Variable pressure pump through nozzle Variable pressure pump through nozzle

1999-07-20

2001-09-18

Dang, Hoang (Department: 3672)

Wells

Processes

Placing or shifting well part

C166S077200, C166S242200, C166S325000, C166S385000

Reexamination Certificate

active

06289992

ABSTRACT:

TECHNICAL FIELD
This invention relates in general to well remediation systems and in particular to the process and components used for filling an annulus in a well with heavy liquid to control pressure build-up in an annulus surrounding leaking casing and/or cement.
BACKGROUND OF THE INVENTION
In wells drilled for petroleum production, a plurality of well casings of different sizes are suspended from a wellhead. A problem encountered in such wells is that of annular pressure control. In the annulus between different casing sizes, pressure may develop due to leaks between strings of casing. Previously, to control the pressure, a relatively heavy liquid is pumped into the annulus at the upper end of the well. The heavy liquid migrates slowly downward, displacing lighter liquid. This technique does not always work.
SUMMARY OF THE INVENTION
In this system, a flexible hose is lowered into an annulus between strings of casing. A nozzle is affixed to the lower end of the hose. The hose may be inserted several hundred feet into the well. During insertion, the hose must be pressurized and rigid to keep the hose from winding about the well. To keep the hose rigid, internal pressure is maintained in the hose. The nozzle is provided with a check valve that holds the internal pressure up to a selected amount. Once the hose is lowered to a desired depth, the operator increases the pressure sufficiently in the hose to open the check valve, thereby allowing heavy liquid to flow out. The heavy liquid displaces the lighter well production, which flows out of the outlet. After the heavy fluid has been dispensed, the internal pressure is reduced, causing the check valve to close. The check valve can also be opened during insertion, if desired. Although heavy fluid is discussed, it should be understood that other fluids including sealant or other Newtonian or non-Newtonian media may be used with the invention.


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