Removal of magnetic particles from a fluid
a technology of magnetic particles and fluids, applied in the direction of magnetic separation, separation process, filtration separation, etc., can solve the problems of large quantities of steel, time-consuming and potentially dangerous methods of separation, and the disposal or re-use of mud can be problematic, so as to reduce the wear of magnets or poles, reduce the cost of disposal and reuse, and reduce the effect of wear
Inactive Publication Date: 2009-08-13
ROMAR INTERNATIONAL LTD
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Benefits of technology
"The invention provides an apparatus, device, and array for removing magnetic particles from a liquid or slurry. The apparatus includes an endless belt or chain with magnetic field generation units to attract magnetic particles, and a drive means to circulate the belt within an enclosing means. The device includes a casing to separate the magnetic particles from the liquid or slurry. The array includes one or more magnets attached to a framework that can be placed on a fluid-carrying channel. The technical effects of the invention are simple and efficient methods to separate magnetic particles from a slurry for easier disposal or reuse."
Problems solved by technology
Such a method obviously produces large quantities of steel swarf derived primarily from the pipeline.
Due to the high steel content of the mud when it exits the bore hole and its potential hazard, in part due to the sharpness of the metal slithers it contains, disposal or re-use of the mud can be problematic.
This is obviously a time consuming and potentially dangerous mode of separation.
Method used
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[0036]Referring initially to FIGS. 1 and 2, these show an overview of an apparatus combining two embodiments of the invention for use as a swarf remover, removing swarf from a mud slurry. In FIG. 1, swarf is to be removed from mud flowing from right to left across the figure. The apparatus shown comprises two distinct sections which act together to remove the maximum percentage of swarf.
[0037]In the first section, the mud is passed around a series of steel pipes 11 of an apparatus 10 through which pipes 11 an endless chain of magnets, moving in the opposite direction to the flow of the mud, is circulated. In the second section, the mud passes a series of static magnets 13 the magnets 13 remove any swarf not caught in the first section.
[0038]FIG. 2 is a schematic representation of the apparatus 10, showing a series of magnets 21, linked together into an endless chain drawn through a steel pipe 22a. Motive force for the movement of the magnets 21 is provided by the rotating driver 23....
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Abstract
An apparatus (10) for removing magnetic particles from a mud slurry is disclosed. The apparatus (10) includes one or more endless belts or chains (12) enclosed almost wholly within a pipe (22a). A motor (28) drives the chain (22) around the pipe (22a). When the pipe (22a) is located within a mud slurry, magnetic particles in the mud slurry are drawn to the pipe (22a) and carried along the outside and away from the slurry until a collar (29) is reached. Once so separated the particles can be collected for disposal. The chain (12) comprises a series of units linked together. Each unit includes a magnet (50) with pole pieces (51a, 51b) at either pole to direct magnetic flux. Wear discs (52a, 52b) prevent the magnets (50) and pole pieces (51a, 51b) from abrasion as they are drawn through the pipe (22a). Units can be included in the chain (12) which units do not include a magnet, thereby providing a break in the field, allowing particles to fall away from the collar region.
Description
FIELD OF THE INVENTION[0001]The present invention relates to apparatus for removing magnetic particles from a fluid. The apparatus finds particular application in the oil and gas industry in relation to separating iron-containing swarf from free-flowing or viscous liquid mud.BACKGROUND TO THE INVENTION[0002]Oil and gas wells usually have their bore holes lined with steel pipes, referred to normally as casing. In mature wells, when oil or gas production drops below economic production levels, it is often useful to utilise at least part of said bore hole. In order to be able to do this one alternative is to remove the casing completely. However, it is more cost effective to simply drill the pipeline out, or at least to drill a window in the pipeline. The window can then be used to allow a drilling assembly to exit the bore hole and reach a new part of the reservoir.[0003]Such a method obviously produces large quantities of steel swarf derived primarily from the pipeline. The swarf is ...
Claims
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IPC IPC(8): B03C1/28
CPCB03C1/286B03C1/20B03C2201/18B01D35/06B03C2201/20
Inventor MCKENZIE, MARTIN
Owner ROMAR INTERNATIONAL LTD