Bore hole clearing

Details Bore hole clearing Bore hole clearing

1999-06-18

2001-04-24

Bagnell, David (Department: 3672)

Wells

With eduction pump or plunger

Having sediment trap or deflector

C166S301000, C166S311000

Reexamination Certificate

active

06220347

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to the clearing of tubes and bores, and particularly oil well and like bore holes.
BACKGROUND OF THE INVENTION
In the drilling and operation of oil wells, a considerable amount of apparatus is often placed down the bore holes. (Although the term “down” is used, some bore holes may have considerable lengths which are far from vertical, and may be substantially horizontal). There can be considerable flows of material trough the bore hole, such as mud used for driving drill heads, and wires or pipes may be passed through the bore hole. Further, the bore hole may pass through friable strata which may be eroded. All these matters can result in the accumulation of detritus, which will here be termed “mud”, in the bore hole; its consistency may of course vary widely. The mud may be deposited along the length of the bore hole, or on top of a piece of apparatus in the bore table.
It is often desirable or necessary to clear a bore hole of such mud. Present techniques for such clearing are relatively primitive. Some form of scraper or similar mechanical device may be lowered into the bore hole in an attempt to loosen compacted mud, and some form of bucket or similar mechanical device may similarly be lowered into the bore hole in an attempt to capture particles or pieces of mud and pull them up to the surface.
OBJECT OF THE INVENTION
The general object of the present invention is to provide an improved technique for clearing bore holes of mud.
SUMMARY OF THE INVENTION
According to one aspect, the invention comprises using a electric motor coupled to a pump to remove mud from a bore hole.
According to another aspect, the invention provides apparatus for clearing a bore hole or the like of debris, comprising a housing, and a cylindrical electric motor coupled coaxially to a direct drive pump, the housing including a debris entry port into which the debris is induced to flow into the housing and wherein the inside of the housing is maintained at an inside pressure which is lower than the outside pressure.
Preferably the apparatus includes debris collection means for effectively isolating any debris pumped by the pump from the bore hole.
The electric motor preferably has a central passage through which material pumped by the pump can pass.
The apparatus preferably has a head rotatable by the motor for engagement with debris deposits in the bore hole. The head may be directly attached to the worm of the pump where the pump is a direct drive worm pump, or the head may comprise a tubular housing around the motor and/or pump. In the latter case, the housing may extend along the whole length of the motor and pump, with the apparatus including a port settable to allow debris to be pumped into the housing from either end.
The debris collection means may be a compartment attached to the motor and having a filter through which fluid may pass but which traps debris. Alternatively, the debris collection means may be a pipe (of the type known as a coiled pipe) extending from the bore hole head to the motor and pump.


REFERENCES:
patent: 5230388 (1993-07-01), Cherrington
patent: 6059030 (2000-05-01), Celestine

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