Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
  • B01F23/50—Mixing liquids with solids
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
  • B01F25/70—Spray-mixers, e.g. for mixing intersecting sheets of material
  • B01F25/74—Spray-mixers, e.g. for mixing intersecting sheets of material with rotating parts, e.g. discs
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
  • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
  • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis

Definitions

• the following relates to a novel and improved method and apparatus for controlling the introduction of solids into a chamber containing a pressurized fluid, such as, for example, blenders for intermixing and pumping large volumes of liquid/sand slurries in downhole fracking operations.
• a pressurized fluid such as, for example, blenders for intermixing and pumping large volumes of liquid/sand slurries in downhole fracking operations.
• impeller vanes considerations in determining the design of the impeller vanes is the mass flow rate or capacity of flow of the solid particles as well as their density for a given speed of rotation of the impeller vanes; and to multiply the RPMs or speed by the number of vanes which in turn will aid in establishing the spacing between the vanes as well as their depth.
• the rate at which the sand is ejected from the center to the impeller region and which may be influenced both by the utilization of expeller blades and a generally conical or raised center. Further, once the diameter of the expeller and its number of vanes is established based on the desired flow rate of sand particles, the diameter of the impeller and shape of its vanes can be determined in order to achieve optimum rate of flow of the sand particles through the impeller region. Conversely, it is important to compute the rate of counterflow of liquids through the spaces between the impeller vanes toward the center of the impeller assembly. From that, one is able to determine the optimum balance point or size and position of vanes necessary to reverse the inward flow and force the slurry to return to the outer annular space surrounding the impeller assembly.
• impeller vane designs which not only achieve the foregoing but minimize the energy expended and reduce wear over long-term use while further simplifying the construction and minimizing the number of parts required in preventing liquid or slurry leakage back into the eye or central area of the assembly.
• Another object is to provide for a method of designing an impeller which takes into consideration a number of variables including flow rates, density and size of particles for a given number and speed of rotation of the impeller vanes as well as their spacing.
• Another object is to provide for an impeller assembly having blocking vane surfaces incorporated into the primary vanes and so spaced and arranged as to maintain optimum balance and deflection of slurry away from the eye of the impeller. It is another object to minimize energy consumption resulting from the counterflow of the liquid between the vanes by blocking the counterflow as close to its origin as possible and causing it to be redirected back into the annular space surrounding the impeller assembly.
• an impeller assembly is characterized in particular by having generally three-sided vanes extending upwardly from a base plate which is in surrounding relation to an eye of the impeller and which in turn is surrounded by an annular housing, each vane having opposite sides converging outwardly from an end surface at or adjacent to an inner radial edge of the base plate and terminating in an apex at or near an outer circumferential edge of the base plate.
• an apparatus for fracking operations which will maintain the delivery of sand through an upper particles inlet in a fluidic state by the selective removal of air from the sand as it approaches the impeller region as well as spreading the sand away from the eye of the impeller to maintain uniform delivery while minimizing blockage and to maintain uniform high speed mass rates of flow of the sand as it intermixes with the water in the formation of a slurry to be used for downhole fracking operations .
• a novel and improved expeller is interposed between the inlet and the impeller assembly to accelerate the delivery of sand from the inlet for intermixture with the water in the impeller region.
• the inner circumferential end surfaces of the impeller vanes are aligned with the expeller vanes extending radially outwardly from the solid inlet.
• the impeller vanes are increased in thickness towards their outer radial ends and are much closer to the leading end of the next vane in blocking return flow of the slurry formed between the water flowing under pressure into the impeller assembly from the annular housing and solid particles driven outwardly by the expeller vanes.
• the impeller vanes may contain blocking ledges toward their inner ends which are closer to and in facing relation to the outer radial ends of each adjacent vane to redirect and prevent the counterflow of slurry toward the center of the impeller.
• FIG. 1 is an elevational view, partially in section of a hydraulically driven mixing system with a low profile blender assembly
• FIG. 2 is another elevational view, partially in section of a hydraulically driven mixing pump
• FIG. 3 is an elevational view, partially in section of another form of mechanically driven mixing pump
• FIG. 4 is a perspective view of a first embodiment of a blender with a combined impeller/expeller assembly
• FIG. 5 is a cross-sectional view of the impeller assembly of FIG. 4 taken about lines 5-5 of FIG. 7;
• FIG. 6 is a perspective view of a top cover plate over a blender assembly as illustrated in FIG. 4;
• FIG. 7 is an elevational view of the
• FIG. 8 is an elevational view of a second embodiment of impeller/expeller assembly
• FIG. 9 is a cross-sectional view taken about lines 9-9 of FIG. 7;
• FIG. 10 is a perspective view of a cover plate over a blender assembly illustrated in FIGs. 8 and 9;
• FIG. 11 is a perspective of a third embodiment of impeller assembly;
• FIG. 12 is a perspective view of another form of a blender with the impeller assembly of FIG. 11;
• FIG. 13 is a plan view of FIG. 11.
• apparatus 10 takes the form of a hydraulically driven mixer shown in FIG. 1 and which may be mounted on a truck, not shown, but shown and described in detail in my U.S. Letters Patent No. 7,967,500.
• a booster pump communicates with an intake port, such as, intake port 24 illustrated in FIG. 1 herein.
• the pump 10 is mounted on a truck bed along with an engine with a drive mechanism to impart rotation via a speed reducer mechanism to a central drive shaft.
• the solid granular matter such as, sand is delivered from a storage area by means of an auger to the upper end of a hopper and advanced by gravity into the impeller area.
• the sand is mixed with a liquid which is introduced through the port 24, and the resultant slurry is discharged via an outlet port 26 through a delivery tube under sufficient pressure to be delivered to a well head.
• the booster pump regulates the pressure in the annulus of the impeller assembly housing and can be closely controlled to maintain a constant pressure level from the outlet of the pump to the inlet port 24 as well as to increase the pressure as desired.
• FIG. 1 there is illustrated in FIG. 1 an apparatus 10 having a generally funnel-shaped hopper 12 converging downwardly and terminating in a lower end 13 mounted by circumferentially spaced struts 14 in closely spaced relation to and above the inner wall 16 of a suspension mount for an impeller assembly 27 in the housing 20.
• the housing 20 is supported on a base mount 22 and includes the intake port 24 and outlet port 26 which are in open communication with an annulus in the housing 20 surrounding impeller assembly 27.
• a drive shaft 30 is mounted centrally of the hopper 10 with the lower end journaled in a hub 32 at the center of the base plate 34 of the impeller assembly 27, and its upper end 36 is mounted in bearings 38 beneath a drive motor 11.
• the sand and other dry chemicals mixed with the sand are advanced by gravity into the central blender area and driven outwardly in a manner to be described to form a slurry with liquids, mainly comprising water, which are introduced throug the intake port 24 and into the anaulus. surrounding the iK-peiler assembly 27.
• K ' lh . : -6 illustrate in more detail the first, embodiment of a .blender unit 2 which is comprised of the base plate 34 and which supports outer, upwardly extending impeller vanes 28 and inne concentric expsller vanes . ' 2.9,, 29' ' mounted on the base plate .3.- and in surrounding relation to the lower .open end of the hopper 12.
• a cover plate 35 is provided with a plurality ;of eircamferentially spaced ribs extending radially along the upper surface of the cover plate 35 from an. inner circular rib 38, Each of the ribs 3S is of uniform thickness toward the outer circular edge of the.
• the cove plate .35 and cage 36 may be of the type shewn in FIGs. 8 and 10 hereinafter described.
• the imp.fe.iler vanes 28 are ci rcuraferentiaily spaced, arcuate generally 3-sided, vanes extending upwardly from the base plate 34 between the outer edges of the expeilsr vanes 29 and outer- circular edge of the base plate 34.
• Each o,f the impeller vanes -28 has Opposite sides 39 and 4D converging outwardly from an end surface 42 to terrainste at an apex 44 at or near an outer circumferential edge of the base plate 34.
• the end surface. 2 extends substantially in a radial direction from an inner radial edge 42'.
• One of the sides 39 is of generally convex configuration and the opposite side 40 is of generally concave configuration and taper or converge outwardly toward one another with the convex surface 39 terminating in a curved surface portion 39' which
• each vane 28 toward the center is closest to the leading end of the next adjacent vane 28 and tends to restrict the inward radial counterflow designated at arrow A of the slurry and deflect it back into the annular space between the impeller vanes 28 and outer housing wall 20.
• FIGs . 4 and 6 illustrate in more detail the expeller vane assembly in which a series of expeller vanes are made up of a combination of alternating longer, curved radial vanes 29 extending from the shaft 30 and substantially shorter but taller vanes 29' extending radially inwardly from the outer edge of the base plate 34.
• Each vane 29, 29' undergoes an arcuate curvature from the central area in a radially outward direction so that its convex side is the leading surface as the vanes undergo rotation in a clockwise direction.
• each vane 29, 29' has its outer edge aligned with one of the inner radial edges of the impeller vanes 28 so that the solid particles are directed uniformally in an outward radial direction between the impeller vanes 28.
• the expeller vanes 39 and 40 have similar configurations, each having an upright generally rectangular support block 42 and an upper right-angled blade portion 44 in order to channel the outward passage of the solid particles into the spaces between the impeller vanes 39, and their slight curvatures will enable smooth transition of the solid particles in an outward radial direction.
• the upper blade portions 44 are of
• the shorter vanes 29' will contact the sand along the outer region of the expeller and tend to drive the sand sideways and outwardly without contacting the longer vanes; and the longer vanes 29 will contact sand along the inner region of the expeller and force the sand in a circumferential and radially outward direction with little or no contact with the shorter vanes.
• the shorter vanes 29' are of greater height than the longer vanes 29 and cover substantially the same area as the longer but lower profile vanes and in this way equalize the amount of sand engaged by each set of vanes 29 and 29' respectively, in order to avoid imbalance.
• the first embodiment herein described lends itself particularly well to use in low profile impeller assemblies of the type illustrated in FIG. 1 and known in the trade as an open inlet blender of the type shown and described in my U.S. Letters Patent Nos. 4,239,396 and 4,460,276 in which the impeller assembly is capable of developing an angular velocity which will prevent reverse flow of intermixed materials through the impeller into the solids inlet.
• FIGs. 2 and 3 illustrate other applications of the blender of FIGs. 4 to 6 to mixing pumps, FIG. 2 being a hydraulically driven mixing pump 10' with a hydraulic motor designated at 11 at the upper end of a drive shaft 30' and once again provided with relief vents or openings 17' between the funnel 12' and upper end of the central opening leading into the central impeller area within the housing 20'.
• the blender or impeller assembly 27' is modified by the addition of lower impeller blades 28' to deliver water under pressure into the annulus or housing 20' surrounding the impeller assembly 27'.
• FIG. 3 A similar application of the impeller assembly 27 of FIGs. 4 to 6 is illustrated in FIG. 3 of a mechanically driven mixing pump 10" in which gearing M is located beneath the blender for a drive shaft 30" extending upwardly into the blender assembly 27" with lower impeller blades 28" and affixed by a lower conical end nut 80.
• a perforated tube 82 extends upwardly through a funnel-shaped solids inlet 12".
• the solids inlet 12" is of two piece construction to permit the escape of air from the solids materials and through spaced openings in the perforated tube 82 to prevent packing and jamming of the sand and pressure build-up of air at the inlet area .
• FIGs. 8-10 there is illustrated in FIGs. 8-10 a second embodiment in which like or similar parts to those of FIGs. 4- 6 are correspondingly enumerated.
• the expeller vanes 29, 29' correspond to those of FIGs. 4-6 and are mounted within a modified impeller assembly 27 ⁇ in which a series of impeller vanes 52 are arranged in equally spaced
• each of the impeller vanes 52 is curved along its entire length from its inner radial edge 54, which is in abutting relation to one of the expeller vanes 29, 29', to its outer radial edge 56 at the outer circumferential edge of the base plate 34.
• Each vane 52 is of uniform width or thickness along its length and of a height corresponding to the height of the shorter expeller vanes 29'; however at its inner radial end, each vane 52 includes a V-shaped lateral extension or deflector 54 which juts into the path of counterflow designated by arrow A' of any slurry attempting to return to the center or eye of the blender 2.
• cover plate 35' having a raised surface 36' with U-shaped grooves 36' at uniformly spaced intervals around the cover plate with the open ends of the grooves extending radially outwardly.
• the cover plate is mounted against the undersurface of the top wall of the housing 20 and spaced above the impeller assembly 27'.
• the assembly 27' is a unitary part of and extends downwardly from the cover plate 35'.
• FIGs. 11 to 13 Another embodiment is illustrated in FIGs. 11 to 13 and in which a modified form of impeller assembly is
• a circular base plate 34 has a central opening 62 which is mounted for rotation on a central drive shaft as in the other embodiments.
• a central expeller vane assembly is made up of generally triangular blades 64 of uniform thickness and diverging upwardly and outwardly from the center 62 to an outer vertical edge 65 in closely spaced facing relation to an inner surface of each of the impeller vanes 61 to be hereinafter described.
• each expeller blade 64 is curved laterally in the direction of rotation of the vanes 61.
• each of the impeller vanes 61 has an arcuate blade 66 curving radially and outwardly from an elbow-shaped portion made up of an inner radial end 68 and a short, radially extending return portion 70.
• the blade elements 66, 68 and 70 are of uniform thickness and the major blade element 66 curves in an outward radial direction from its inner radial edge to an outer radial edge 72 which is flush with the outer circular edge of base plate 34.
• one side surface 73 is concave and the opposite side 74 is convex, and each return portion 70 extends radially outwardly in a direction toward an outer edge 72 of each next blade 62 in succession so as to define a limited space or gap between the adjacent vanes.
• the spacing between adjacent vanes is regulated to limit the counterflow of slurry toward the center of the impeller/expeller assembly.
• the cover plates and the expeller assemblies of the three embodiments are interchangeable .
• the assembly 27" of FIGs . 11 to 13 are shown as part of the blender assembly in FIG. 3 but the base plate 34 serves as a divider plate for a lower impeller assembly designated at 28".
• the first and second embodiments are interchangeable and may be mounted as illustrated in FIGs. 1 and 2 with or without a lower impeller arrangement.
• each impeller vane In the design of the impeller vanes, a number of factors must be taken into consideration as noted earlier and including but not limited to the velocity of the liquid toward the center of the impeller after each vane passes by a given point on the impeller.
• the arrow A represents the direction of return flow of slurry entering the space between vanes 28.
• the widened end of each impeller vane will act as a deflector and can be moved outwardly to meet the fluid path as close to its origin as possible to the outer periphery of the impeller assembly. In other words, the sooner the fluid is blocked and redirected back toward the annulus the less energy will be consumed.
• FIG. 9 represents an alternative approach by the utilization of the ledges or blocking vanes 54 opposite to the point of entry of the liquid from the annulus into the space between the vanes 52.
• This approach reduces the overall size of each vane but does require greater energy in that the deflector is located closer to the center of the impeller assembly before it is deflected back toward the annulus.
• the liquid or fluid path is represented by the arrow A' .
• FIG. 13 illustrates still another approach in which the blocking vane is mounted more toward the bottom of the vane with its return end 70 being positioned in the path of slurry to prevent it from invading the center of the impeller, but requires greater energy consumption by virtue of the greater spacing between the outer end or edge 72 of each impeller and the inner end 68 of each next successive
• the fluid path is represented by the arrow A" which is much longer and, while the fluid is blocked from reaching the center of the impeller, must be pumped back into the annulus thereby reducing the efficiency of the system.
• the amount of pressure generated by the mixing pump in relation to the mass rate of flow of the sand or other granular material must be taken into consideration in

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Dispersion Chemistry (AREA)
• Mixers Of The Rotary Stirring Type (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)

Applications Claiming Priority (1)

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• 2012
  • 2012-09-17 EP EP12884349.7A patent/EP2895258A4/de not_active Withdrawn
  • 2012-09-17 RU RU2015114174/05A patent/RU2604628C2/ru active
  • 2012-09-17 CN CN201280076982.1A patent/CN104812471B/zh not_active Expired - Fee Related
  • 2012-09-17 CA CA2884578A patent/CA2884578C/en active Active
  • 2012-09-17 AU AU2012389829A patent/AU2012389829B2/en not_active Ceased
  • 2012-09-17 WO PCT/US2012/055731 patent/WO2014042655A1/en unknown
• 2018
  • 2018-01-16 AU AU2018200356A patent/AU2018200356B2/en not_active Ceased

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