# US 5,700,376 A · Method and apparatus for magnetically treating flowing liquids > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,700,376 A - Document ID: US5700376A - Status: Granted - Kind: A - Application number: 08/605,193 - Filed: 1996-03-01 - Granted: 1997-12-23 - Earliest claimed: 1996-03-01 - Inventors: Roland K. Carpenter - Web page: https://patentgrep.com/patent/US5700376A ## CPC - E21B 17/1078: {Stabilisers or centralisers for casing, tubing or drill pipes (E21B17/1007 - E21B17/1064 take precedence)} - E21B 17/003: {with electrically conducting or insulating means (E21B17/028 and E21B17/023 take precedence)} - E21B 37/00: Methods or apparatus for cleaning boreholes or wells (E21B21/00 takes precedence) - E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS ## Abstract An apparatus and method is disclosed including first and second housing halves which are welded together to attach the apparatus to a pup joint installed in an oil casing. The housing includes a cylindrical portion and first and second frustoconical portions at opposite axial ends thereof. Axially extending L-shaped spacers are secured to the inside portion and include longitudinal edges which abut with the outer surface of the pipe. Series of axially spaced, first and right parallelepiped shaped magnets are sandwiched between the inside portion of the cylindrical portion and the outer surface of the pipe, with the poles of the first and magnets being reversed relative to the pipe. The housing halves are welded along their longitudinal free edges after being clamped together by a clamping band with sufficient force to secure the apparatus to the pipe generally by frictional forces and being free of the attachment to the pipe. ## Claims ### Claim 1 Apparatus for magnetically treating flowing liquids through a pipe, with the pipe having an outer surface having a circular cross section of a diameter, comprising, in combination: a housing including a cylindrical portion, with the cylindrical portion having inside and outside surfaces having circular cross sections of diameters larger than the diameter of the outer surface of the pipe, with the housing further including a plurality of parallel spacers secured at circumferentially spaced locations to the inside surface of the cylindrical portion and having axial lengths generally equal to the axial length of the cylindrical portion, with the spacers having free edges which terminate in a cylinder having a diameter generally equal to the diameter of the outer surface of the pipe; and means for producing a magnetic field for a liquid flowing through the pipe comprising, in combination: a series of first magnets sandwiched between the inside surface of the cylindrical portion and the outer surface of the pipe, with the first magnets being circumferentially spaced from each other and from the spacers; and a series of second magnets sandwiched between the inside surface of the cylindrical portion and the outer surface of the pipe and axially spaced from the first magnets, with the second magnets being circumferentially spaced from each other and from the spacers, with the first and second magnets each having north and south poles, with the first magnets having the north poles located radially outward of the south poles and the second magnets having the south poles located radially outward of the north poles. ### Claim 2 (depends on 1) The apparatus of claim 1 wherein the housing is secured to the pipe generally by frictional forces between the free edges of the spacers and the outer surface of the pipe and free of any attachment to the pipe. ### Claim 3 (depends on 1) The apparatus of claim 1 wherein the spacers are L-shaped having first legs secured to the inside surface of the cylindrical portion and having second legs integrally extending generally perpendicular to the first legs and terminating in the free edges. ### Claim 4 (depends on 1) The apparatus of claim 1 wherein the magnets have a right parallelepiped shape having a top edge, a bottom edge, an inner edge abutting with the outer surface of the pipe, an outer edge abutting with the inside surface of the cylindrical portion, a first face, and a second face, with the height of the inner and outer edges between the top edge and the bottom edge being generally equal to the width of the first and second faces between the inner and outer edges and being a multiple of the thickness of the top and bottom edges between the first and second faces, with the poles located at the inner and outer edges. ### Claim 5 (depends on 4) The apparatus of claim 4 wherein the width of the first and second faces between the inner and outer edges is double the thickness of the top and bottom edges between the first and second faces. ### Claim 6 (depends on 5) The apparatus of claim 5 wherein the height of the inner and outer edges between the top edge and the bottom edge is larger than the thickness of the top and bottom edges between the first and second faces. ### Claim 7 (depends on 1) The apparatus of claim 1 wherein the housing further includes first and second means for closing the spacing between the inside surface of the cylindrical portion and the outer surface of the pipe on the opposite axial ends of the cylindrical portion. ### Claim 8 (depends on 7) The apparatus of claim 7 wherein the closing means each comprise a frustoconical portion, with the frustoconical portions each including a major base having inside and outside surfaces having circular cross sections of diameters equal to and interconnected to the diameters of the inside and outside surfaces of the cylindrical portion, with the frustoconical portions each including a minor base located axially outward of the cylindrical portion and having an inside surface having a circular cross section of a diameter generally equal to the pipe. ### Claim 9 (depends on 1) The apparatus of claim 1 wherein the housing is divided into first and second longitudinal portions which are radially separable from the pipe, with each of the longitudinal portions including first and second longitudinal edges; wherein the housing includes means for securing the first and second longitudinal portions together with the longitudinal edges of the first longitudinal portion abutting with the longitudinal edges of the second longitudinal portion and with the first and second longitudinal portions being secured together generally without exceeding the diameter of the outside surface of the cylindrical portion and being free of any attachment to the pipe. ### Claim 10 (depends on 9) The apparatus of claim 9 wherein each housing portion includes first and second edge spacers located adjacent to the first and second longitudinal edges and at least a first intermediate spacer located intermediate the first and second edge spacers. ### Claim 11 (depends on 9) The apparatus of claim 9 wherein the housing is secured to the pipe generally by frictional forces between the free edges of the spacers and the outer surface of the pipe. ### Claim 12 Method for magnetically treating flowing liquids comprising the steps of: providing a pipe including an outer surface having a circular cross section of a diameter; providing a magnetic apparatus producing a magnetic field and including a housing having a cylindrical portion, with the cylindrical portion including an outside surface having generally circular cross sections of a diameter larger than the diameter of the pipe, with the outside surface of the cylindrical portion of the housing having a radial size larger than the remaining portions of the housing, with the magnetic apparatus including the housing being divided into first and second longitudinal portions which are radially separable from the pipe; attaching the first and second longitudinal portions together to secure the magnetic apparatus to the pipe generally by frictional forces between the first and second longitudinal portions and the pipe and being free of attachment of the first and second longitudinal portions to the pipe; and flowing the liquid through the pipe after the magnetic apparatus is secured to the pipe characterized in that the attaching step comprises the steps of: clamping the first and second longitudinal portions on the pipe with sufficient force to secure the magnetic apparatus to the pipe generally by frictional forces between the first and second longitudinal portions and the pipe; attaching the first and second longitudinal portions together generally without exceeding the diameter of the cylindrical portion; and removing the clamping force from the first and second longitudinal portions after the first and second longitudinal portions are attached together. ### Claim 13 (depends on 12) The method of claim 12 further comprising the step of inserting the pipe with the magnetic apparatus secured thereon within a casing pipe, with the pipe and the magnetic apparatus secured thereon having a diametric size less than the casing pipe. ### Claim 14 (depends on 13) The method of claim 13 wherein the clamping step comprises the step of tightening a band around the outside surface of the cylindrical portion. ### Claim 15 (depends on 14) The method of claim 14 wherein the step of providing the magnetic apparatus comprises the step of providing the magnetic apparatus including the housing having the cylindrical portion including an inside surface having circular cross sections of a diameter larger than the diameter of the outer surface of the pipe, with the housing further including a plurality of parallel spacers secured at circumferentially spaced locations to the inside surface of the cylindrical portion and having axial lengths generally equal to the axial length of the cylindrical portion, with the spacers having free edges which terminate in a cylinder having a diameter generally equal to the diameter of the outer surface of the pipe. ### Claim 16 (depends on 14) The method of any claim 14 wherein the step of providing the magnetic apparatus comprises the step of providing the housing further including first and second frustoconical portions, with the cylindrical portion including an inside surface having circular cross sections of a diameter larger than the diameter of the outer surface of the pipe, with the frustoconical portions each including a major base having inside and outside surfaces having circular cross sections of diameters equal to and interconnected to the diameters of the inside and outside surfaces of the cylindrical portion, with the frustoconical portions each including a minor base located axially outward of the cylindrical portion and having an inside surface having a circular cross section of a diameter generally equal to the pipe. ### Claim 17 (depends on 12) The method of any claim 12 wherein the step of providing the magnetic apparatus comprises the step of providing the first and second longitudinal portions each including first and second longitudinal edges having an outer radial size not exceeding the outside surface of the cylindrical portion; and wherein the clamping step includes abutting the longitudinal edges of the first longitudinal portion with the longitudinal edges of the second longitudinal portion. ### Claim 18 (depends on 17) The method of claim 17 wherein the attaching step comprises the steps of welding the first longitudinal edges of the first and second longitudinal portions together and welding the second longitudinal edges of the first and second longitudinal portions together. ### Claim 19 (depends on 12) The method of claim 12 wherein the clamping step comprises the step of tightening a band around the outside surface of the magnetic apparatus. ### Claim 20 Method for magnetically treating flowing liquids comprising the steps of: providing a pipe including an outer surface having a circular cross section of a diameter; providing a magnetic apparatus producing a magnetic field and including a housing having a cylindrical portion, with the magnetic apparatus including the housing being divided into first and second longitudinal portions which are radially separable from the pipe; attaching the first and second longitudinal portions together and being free of attachment of the first and second longitudinal portions to the pipe, with the magnetic apparatus being secured with sufficient force to the pipe generally by frictional forces between the first and second longitudinal portions and the pipe, with the cylindrical portion having inside and outside surfaces having circular cross sections of diameters larger than the diameter of the outer surface of the pipe, with the magnetic apparatus further including a series of first magnets sandwiched between the inside surface of the cylindrical portion and the outer surface of the pipe, with the first magnets being circumferentially spaced from each other, with the magnetic apparatus further including a series of second magnets sandwiched between the inside surface of the cylindrical portion and the outer surface of the pipe and axially spaced from the first magnets, with the second magnets being circumferentially spaced from each other, with the first and second magnets each having north and south poles, with the first magnets having the north poles located radially outward of the south poles end the second magnets having the south poles located radially outward of the north poles, with the magnetic apparatus further including a plurality of parallel spacers secured at circumferentially spaced locations to the inside surface of the cylindrical portion and having axial lengths generally equal to the axial length of the cylindrical portion, with the spacers having free edges which terminate in a cylinder having a diameter generally equal to the diameter of the outer surface of the pipe, with the first and second magnets being circumferentially spaced from the spacers; and flowing the liquid through the pipe after the clamping force is removed. ### Claim 21 (depends on 20) The method of claim 20 wherein the step of providing the magnetic apparatus comprises the step of providing the magnets of a right parallelepiped shape and having a top edge, a bottom edge, an inner edge abutting with the outer surface of the pipe, an outer edge abutting with the inside surface of the cylindrical portion, a first face, and a second face, with the height of the inner and outer edges between the top edge and the bottom edge being generally equal to the width of the first and second faces between the inner and outer edges and being a multiple of the thickness of the top and bottom edges between the first and second faces, with the poles located at the inner and outer edges. ### Claim 22 Method for magnetically treating flowing liquids comprising the steps of: providing a pipe including an outer surface having a circular cross section of a diameter; providing a magnetic apparatus producing a magnetic field and including a housing having a cylindrical portion, with the magnetic apparatus including the housing being divided into first and second longitudinal portions which are radially separable from the pipe; and attaching the first and second longitudinal portions together and being free of attachment of the first and second longitudinal portions to the pipe, with the cylindrical portion having inside and outside surfaces having circular cross sections of diameters larger than the diameter of the outer surface of the pipe, with the housing further including a plurality of parallel spacers secured at circumferentially spaced locations to the inside surface of the cylindrical portion and having axial lengths generally equal to the axial length of the cylindrical portion, with the spacers having free edges which terminate in a cylinder having a diameter generally equal to the diameter of the outer surface of the pipe, with the spacers being of an L-shape including first legs secured to the inside surface of the cylindrical portion and having second legs integrally extending generally perpendicular to the first legs and terminating in the free edges; and flowing the liquid through the pipe after the clamping force is removed. ### Claim 23 Apparatus for magnetically treating flowing liquids through a pipe, with the pipe having an outer surface having a circular cross section of a diameter, comprising, in combination: a housing including a cylindrical portion, with the cylindrical portion having inside and outside surfaces having circular cross sections of diameters larger than the diameter of the outer surface of the pipe, with the housing further including a plurality of parallel spacers secured at circumferentially spaced locations to the inside surface of the cylindrical portion and having axial lengths generally equal to the axial length of the cylindrical portion, with the spacers having free edges which terminate in a cylinder having a diameter generally equal to the diameter of the outer surface of the pipe; and means located between the inside surface of the cylindrical portion and the outer surface of the pipe for producing a magnetic field for a liquid flowing through the pipe, with the spacers being L-shaped and having first legs secured to the inside surface of the cylindrical portion and having second legs integrally extending generally perpendicular to the first legs and terminating in the free edges.