Boring or penetrating the earth – With means movable relative to tool or shaft to control...
Patent
1998-04-16
2000-12-19
Johnson, Brian L.
Boring or penetrating the earth
With means movable relative to tool or shaft to control...
166222, E21B 4100
Patent
active
06161632&
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an arrangement for flushing upwards in an annular space between a drill pipe or a drill stem, which is composed of several pipe sections, and a bore hole wall or between a drill pipe/drill stem and a liming pipe, in an underground well, pressurized liquid is conducted with an axial flow through the drill pipe in order to drive a drill head and/or a hydraulic dredge motor. In addition, the pressurized liquid is used for flushing the annular space, where there is inserted in the drill pipe/drill stem a flushing member with nozzles, which are directed obliquely backwards into the annular space between the flushing member and the side wall, of the bore hole.
BACKGROUND OF THE INVENTION
In regards to well-boring operations, there are potentially big challenges in connection with complicated well paths, including deep and long horizontal sections. The need for good hole cleaning is of great significance, as the well drillings of today have hole cleaning problems. Various sludge compositions have been investigated and positive results have been achieved, but an improvement of the sludge composition alone has not been enough to solve the problems. New equipment of different design has also been tested and rotation at different speeds has been tried out in the prior art, without obtaining a reliable improvement of the hole cleaning.
A mechanical flushing device has been developed, which can be mounted in the drill stem or in other stems, such as coil pipes, "snubbing" etc., which are used in connection with well operations. The flushing device can be preadjusted for a desired percentage-wise distribution of the drill sludge, e.g., distribution of supplied drill sludge outwardly through the flushing ports and through the motor/drill head respectively. The flow distribution can be undertaken in a regulatable manner when the flushing device is activated. During drilling, provision is made for drill sludge to be supplied to the motor/drill head.
In the drilling of long wells, which are often complicated with considerable horizontal paths, significant problems have arisen in transporting drill crushings (drill material) to the surface. The development of technology has gone in the direction of higher drilling speed, something which further reinforces the problem.
During normal drilling, the annular space speed for the backward flowing sludge often becomes too slow to whirl up crushings in the annular space. Consequently, the crushings are not suspended to a sufficient degree in the sludge, with the result that the hole cleaning is too poor. The danger of dragging the drill stem along deposited crushings, for example over "stabilizators", increases the chance of packing, wedging, sludge loss, and the like. Furthermore, imperfect hole cleaning generally makes the drilling operations difficult and, by way of example, defective transport of crushings can prevent intentional side displacement ("sliding") by control in horizontal wells, with a reduced drilling speed following from this. Also, it is further known that in elongate wells there are often problems with high moment loadings. Imperfect hole cleaning is a main cause of the problems.
During the drilling operation, the drill sludge is pumped downwards through the drill stem, outwards through the drill head and further backwards through the annular space between the drill stem and the bore hole wall. When the sludge has passed the drill head and is deflected back through the annular space, the speed profile over the hole area will be different. In the horizontal path of the bore hole the drill stem will abut the low side of the bore hole, something which in turn will result in the main flow of sludge following a course into the upper portion of the cross-section of the hole. In the lower portion of the cross-section of the hole, the speed of flow will consequently become significantly lower, something which leads to the crushings being more readily deposited along the flow side of the hole cross-section. Gradually, the flow will becom
REFERENCES:
patent: 1706072 (1929-03-01), Rieger
patent: 1807837 (1931-06-01), Fortune
patent: 1899728 (1933-02-01), Sandstone
patent: 2765146 (1956-10-01), Williams, Jr.
Derwent's Abstract, No. 89-277106/38, Abstract of SU 1469094 no date.
Johnson Brian L.
Sliteris Joselynn
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