Method of servicing a well

Details Method of servicing a well Method of servicing a well

2000-03-30

2001-11-13

Tsay, Frank S. (Department: 3672)

Wells

Processes

Cleaning or unloading well

C166S090100, C166S368000

Reexamination Certificate

active

06315046

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a method of servicing a well and, in particular, a method of cleaning a well that is contaminated by accumulations of sand.
BACKGROUND OF THE INVENTION
With many producing wells the incursion of sand into the well is a problem. When it becomes apparent that the incursion of sand is adversely affecting the production from the well to such an extent that the well is not economical, the well is serviced to clean out the accumulated sand. Current procedures for cleaning sand from the well involve the use of a service rig to pull the tubing hanger and remove the sucker rods and tubing string. A sandline bailing unit or tubing bailing unit is then used to remove sand from the wellbore. This is a costly and time consuming procedure.
SUMMARY OF THE INVENTION
What is required is an alternative method of servicing a well.
According to the present invention there is provided a method of servicing a well. In accordance with the method a casing spool is provided having a body with an exterior surface, a first end, a second end, and a central flow passage. An attachment flange is provided at the first end of the body. An internal bowl is positioned at the first end of the body providing a seat for a tubing hanger. At least one endless tubing access port is positioned between the internal bowl and the second end of the body. The endless tubing access port extends from the exterior surface to the central flow passage in an angular orientation from the exterior surface toward the second end of the body. The endless tubing access port has a feed passage that extends toward the first end and outwardly from the body. The feed passage terminates in a flow control valve. The casing spool is installed on a well by securing the second end of the body to well casing, and positioning in the internal bowl a tubing hanger supporting a tubing string. When accumulated sand adversely affects the performance of the well, endless tubing is extended through the endless tubing access port while the tubing hanger is still in position supporting the tubing string. The endless tubing passes along the central flow passage beside the tubing string. Fluids are then pumped through the endless tubing to promote fluid circulation.
The method, as described above, eliminates the need for a service rig to attend the well and pull the tubing hanger and tubing string prior to sand clean out procedures. A less costly endless tubing unit can attend the well and either wash a majority of the accumulated sand back into the formation or up to surface.


REFERENCES:
patent: 4223724 (1980-09-01), Levoni et al.
patent: 4765410 (1988-08-01), Rogers et al.
patent: 4778006 (1988-10-01), Derowitsch
patent: 4972904 (1990-11-01), Gordare
patent: 5865249 (1999-02-01), Gipson et al.
patent: 6142232 (2000-11-01), Troutt et al.
“Geothermal Wellheads and Gate Valves,” from Cameron Ironworks Web Site, pp. 1-3, published at least as early as Apr. 1, 1998.

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