JP2000303770A - Device for absorbing and discharging slurry - Google Patents

Abstract

PROBLEM TO BE SOLVED: To completely suck from a slurry tank a slurry containing a high proportion of solids which are particularly difficult to suck by means of a pump. SOLUTION: This device for sucking a slurry, e.g. muddy water containing fragments generated during excavation for petroleum or the like, includes a generally horizontally disposed crushing device which includes two reverse rotating shafts 7, 8 having cutters 9 and spacers 10 alternately. An inching cavity type pump is vertically positioned above the crushing device. The spacers 10 are axially made thicker than the cutters 9 so that the crushing device allows passage of fragments of sizes permitted for a pump. In order to agitate the slurry sucked, impellers are positioned adjacent to and at the same level as the crushing device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for sucking and discharging slurry, for example, waste slurry generated by excavation work, using a pump.

[0002]

2. Description of the Related Art When drilling oil, the drilling head is often driven by a mud motor. The mud motor is powered by mud pushed down through a drill pipe, which rises up the drilled hole and returns to the surface. Mud motors are usually progressive cavity motors, in which case the screw rotor is
It rotates and traces in a stator having screw holes of equal pitch, but the stator has ± 1 thread. The returning muddy water or slurry is typically drained into the tank and contains a high percentage of foreign matter and contaminants, which remain in the tank. Debris in the slurry is very diverse, including rock, drill head debris, mud motor stator polymer debris, and often includes drilling rig waste such as nuts, bolts, spanners, and the like. When the slurry tank is full, it is removed and used as landfill waste. In the case of drilling rigs used offshore, the slurry tank is usually located on a barge used for a reservoir for sewage treatment to empty the tank.

[0003]

Since the slurry contains a high percentage of hard and easily damaged foreign substances, the slurry is a medium that is particularly difficult to be pumped out by a pump. It is particularly difficult to completely empty the slurry tank, as it increases towards the bottom. It has been proposed to use a centrifugal pump protected by a stationary screen to pump the slurry, but this proved unsatisfactory.

[0004]

According to the present invention, there is provided a device for pumping and discharging slurry, the device comprising a screen adapted to pass only debris smaller than a predetermined size;
A generally horizontally disposed screen having an inlet at the lower surface and an outlet at the upper surface, a positive displacement pump for pumping and discharging the slurry, a pump also disposed above the screen and having an inlet; and A chamber connecting an outlet to the inlet of the pump.

[0005] Positive displacement pumps are pumps that deliver an equal volume of product at each revolution or stroke, independent of the pump's pumping speed. Rotary power type such as centrifugal pump (roto
dynamic) The pump requires a constant speed to achieve the centrifugal effect. Positive displacement pumps have been found to be more effective in pumping and draining operations, especially when operating at low speeds, since they have less effect on the rheological properties of the slurry. The centrifugal pump was also found to thicken the slurry. The pump is preferably of the progressive cavity type, i.e. the Moineau type, and comprises a single threaded rotor and a double threaded stator.

The screen prevents blockage or damage to the pump by eliminating oversized debris. The screen is
A crushing device, or a combination of screen and crushing device, is preferred, which simply removes excessive debris for passage through the pump and reduces it rather than moving it by other means. However, in some embodiments, a simple screen, eg, a bar or mesh screen, is sufficient. These screens may be stationary or rocking to avoid blockage.

[0007] A presently preferred embodiment of the present invention comprises a device for sucking and discharging slurry, which includes a crushing device, a funnel-shaped chamber, and a progressive cavity pump. The crushing device comprises a crushing chamber having side walls and upper and lower open surfaces, two parallel, substantially horizontally disposed axes extending between the side walls of the crushing chamber, and alternating on the axis. A cutter wheel and a spacer mounted on the shaft, and a device for driving the shaft to rotate in a relative direction, wherein the cutter wheel has a larger diameter than the spacer, and is provided on one of the shafts. The cutter wheel is inserted between cutter wheels on the other axis of the axis. The funnel-shaped chamber has upper and lower openings, and the lower opening of the chamber is larger than the upper opening and communicates with the upper open surface of the crushing chamber.
The progressive cavity pump further comprises an N-threaded rotor and a stator having an N ± 1 threaded hole complementary to the rotor penetrating therethrough, wherein the stator is disposed substantially vertically. The pump has an inlet end communicating with an upper opening of the hopper chamber. With the above configuration, during use, the pump is operated to suck out slurry from the hopper type chamber,
The slurry is drawn in through the crushing device, and further, by rotating the shafts of the crushing device in relative directions, fragments smaller than a predetermined size are passed, and pieces larger than the predetermined size are crushed. Further, the predetermined dimensions are acceptable for the pump.

[0008] The present invention further comprises a boom assembly, the boom assembly including a pivotable boom, and a pump unit mounted to a distal end of the boom and immersed in slurry. In. The pump unit includes:
The screen includes a screen, a positive displacement pump for sucking and discharging the slurry, and a chamber. The screen is adapted to pass only debris smaller than a predetermined size and is arranged substantially horizontally, and has a lower surface inlet and an upper surface outlet. The positive displacement pump is disposed above the screen and has an inlet. Furthermore, the chamber connects the outlet of the screen to the inlet of the pump.

The boom assembly may be used to remove slurry from a barge, for example, by immersing the pump unit in slurry in the barge and allowing the pump unit to reach all parts of the barge. It is convenient. The boom assembly can be installed as desired on the wharf or on another vessel.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described below with reference to embodiments and the accompanying drawings. In the drawings, similar members are given the same reference numerals. FIG. 1 shows a pump device 1 according to a first embodiment of the present invention. This pump device
The slurry generated by the excavation is sucked and discharged from a tank disposed on a barge or similar equipment.
A screen device 4 is provided at the suction end of the pump device 1. The screen device 4 allows the fragments 2 in the slurry having a size that can be sucked out by the pump 12 to pass through, and the oversize fragments 5 to be crushed. The pump 12 is, in this embodiment, a progressive cavity type having a single threaded rotor and a double threaded bore in the stator. Pump 1
2 is driven by a motor 12a via a drive shaft 12b, and sucks the slurry from the hopper-shaped chamber 4a above the pulverizing screen 4 into the drive shaft chamber 12c. The slurry is discharged from chamber 12c to a final processing point via a suitable conduit (not shown).

The pump device 1 also has an impeller 6 adjacent to the grinding screen 4 and arranged at the same level as the screen. The impeller 6 serves to stir the slurry generated by the excavation and keep the solid suspended in the slurry. Although FIG. 1 shows only the crushing screen 4 and the impeller 6 immersed in the slurry, it is possible to immerse the entire apparatus arbitrarily by performing appropriate protective processing. The pump device 1 can be mounted at the end of the boom or suspended from a crane and lowered into the slurry tank so that the bottom of the tank is flushed.

FIG. 2 shows an enlarged view of the grinding screen 4 as viewed from below. As can be seen, the grinding screen 4 has two counter-rotating shafts 7, 8 driven via a motor 4b and a gear 4c. These axes are arranged horizontally and the screen 4
Only two outer cavities 14 and a central cavity 13 between the axes. The direction of rotation indicated by the arrow in the figure is such that the debris is moved from the outer space 14 to the central space 13.
It is for drawing in.

Each shaft 7, 8 comprises a series of cutter wheels 9 separated by a cylindrical spacer 10. The spacer 10 is configured to be axially thicker than the cutter wheel 9, the cutter wheel 9 having a larger diameter than the spacer and being inserted between each other to form a gap 11 through which the small solid 2 can pass. . Each cutter wheel 9 has at least one, preferably a plurality, for example seven teeth 9a as in this embodiment. Gap 1
The size of 1 is determined by the solid size allowed for the pump 12, and in one preferred embodiment is of the order of 8 mm in the axial direction. Excessive solid debris 5 to pass through gap 11
Are crushed by the cutter wheel 9 and made small enough to pass.

FIG. 4 shows the pump device 1 mounted on the end of a swivelable or swingable boom 20 so that it can be lowered into the slurry in the barge 30. When sucking the slurry from the barge 30, the pump unit can be lowered and immersed in the slurry to an appropriate depth. The pump unit may also move all the way through the barge, especially where the barge is sectioned or laid down, e.g. projecting upwards from the bottom, creating a dead space in the slurry tank. , The slurry can be reliably removed from all parts. The boom 20 can be installed on the pier or on another ship. The slurry can be sent to a desired location by a flexible tube 40.

[Brief description of the drawings]

FIG. 1 is a schematic partial sectional side view of a first embodiment of the present invention.

FIG. 2 is a schematic enlarged bottom view of the crushing screen of the first embodiment.

FIG. 3 is a partially enlarged perspective view of a reverse rotation shaft of the crushing screen of FIG. 2;

FIG. 4 is a schematic view of a first embodiment of the present invention mounted on a boom.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pump apparatus 2 Small pieces that can pass 3 Slurry 4 Screen device (crushing screen) 5 Excessive pieces that cannot pass 6 Impeller 9 Cutter wheel 9a Teeth 10 Spacer 11 Gap 12 Pump unit 13 Central void

Claims (16)

[Claims] 1. A device for sucking and discharging slurry, said device comprising a screen adapted to pass only debris (3) smaller than a predetermined size, also substantially parallel with an inlet on a lower surface and an outlet on an upper surface. A screen (4) disposed on the screen, a positive displacement pump for sucking and discharging the slurry, and a pump (12) also disposed above the screen and having an inlet
And a chamber (4a) for connecting an outlet of the screen (4) to an inlet of the pump (12). 2. Apparatus according to claim 1, wherein said pump (12) is a progressive cavity pump. 3. The chamber (4a) has upper and lower openings, the lower opening of the funnel-shaped chamber being larger than the upper opening and communicating with the outlet of the screen (4). Apparatus according to claim 1 or claim 2, wherein the upper opening is in communication with the inlet of the pump (12). 4. The apparatus according to claim 3, wherein the cross-sectional area of the hopper-shaped chamber (4a) decreases uniformly from the lower opening to the upper opening. 5. The screen (4) is further adapted to crush fragments having a size equal to or greater than the predetermined size.
Apparatus according to any one of claims 1 to 4. 6. The screen (4) includes a crushing device, the crushing device having side walls and first and second relative rotational parallel axes (7, 8) extending between the side walls. A crushing chamber and a plurality of cutters (9) and spacers (8) alternately mounted on each of the first and second shafts, wherein the first shaft cutter is a second shaft cutter. And at least one tooth (9a) for each of said cutters (9)
The device according to claim 5, wherein a device is provided. 7. An axial thickness of the spacer (8) is:
7. The device according to claim 6, wherein the thickness is greater than the axial thickness of the cutter (9). 8. An axial thickness of the spacer (8) is about 1 to 50 mm larger than an axial thickness of the cutter (9).
Apparatus according to claim 7, preferably larger by a value in the range of 5-20 mm. 9. A motor (46) for driving one of the shafts (7, 8) and a gear (40) interconnecting the shafts (7, 8) such that the shafts (7, 8) rotate in relative directions. 4c)
An apparatus according to claim 7 or claim 8, comprising: 10. Apparatus according to claim 1, further comprising at least one impeller (6) arranged near the screen (4). . 11. A device for sucking and discharging slurry, the device comprising a crushing device, a funnel-shaped chamber (4a), and a progressive cavity pump (12), wherein the crushing device has side walls and open upper and lower portions. A crushing chamber having a surface, and two parallel, substantially horizontally disposed axes (7, 8) extending between the side walls of the crushing chamber;
Cutter wheels (9) alternately mounted on said shaft
And a device (4b, 4c) for driving the shaft to rotate in a relative direction, wherein the cutter wheel has a larger diameter than the spacer, and the shaft (7, 8). The cutter wheel on one axis of the shaft is inserted between the cutter wheels on the other axis of the axis, the funnel-shaped chamber (4a) has upper and lower openings, The lower opening is larger than the upper opening of the chamber and communicates with the upper opening surface of the crushing chamber, and the progressive cavity pump (12) includes an N-three-shaped rotor and the rotor. A stator having complementary N ± 1.3 shaped holes therethrough, said stator being disposed substantially vertically, and said pump (12) being provided in said funnel-shaped chamber (4a). Upper part An inlet end communicating with the opening, wherein the pump (12) is in use during use.
Is operated so as to suck out the slurry (3) from the funnel-shaped chamber (4a), so that the slurry is sucked out through the crushing device and both the shafts (7, 8) of the crushing device are operated. By rotating in the relative direction,
A device for sucking and discharging slurry, wherein fragments smaller than a predetermined size pass, fragments larger than the predetermined size are crushed, and the predetermined size is acceptable for the pump. 12. The apparatus (1) is adapted to be operable when immersed in a slurry (3).
Apparatus according to any one of the preceding claims. 13. The device (1) comprises:
2. The device according to claim 1, wherein the device is attached to an end of the device.
An apparatus according to any one of the preceding claims. 14. The device according to claim 12, comprising an additional device for allowing suspension from a crane. 15. A boom assembly, comprising: a swivelable boom (20); and a pump unit mounted on a distal end of the boom and immersed in a slurry (3). Includes a screen (4), the positive displacement pump for sucking and discharging slurry (12), and a chamber (4a), wherein the screen (4) is adapted to pass only debris smaller than a predetermined size, and substantially A horizontal pump having a lower surface inlet and an upper surface outlet, wherein the positive displacement pump (12) is positioned above the screen (4) and has an inlet; A boom assembly wherein (4a) connects the outlet of the screen (4) to the inlet of the pump (12). 16. The screen according to claim 1, wherein the screen is a munching device for reducing oversized debris.
A boom assembly according to claim 5.