CN111364926A - Coal slime cleaning device - Google Patents

Coal slime cleaning device Download PDF

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Publication number
CN111364926A
CN111364926A CN201811587452.9A CN201811587452A CN111364926A CN 111364926 A CN111364926 A CN 111364926A CN 201811587452 A CN201811587452 A CN 201811587452A CN 111364926 A CN111364926 A CN 111364926A
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CN
China
Prior art keywords
coal slime
tube
pipe
sieve
mud
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Pending
Application number
CN201811587452.9A
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Chinese (zh)
Inventor
尹德财
郝鹏程
黄鑫
高举
刘超
霍铁刚
马科迪
郭志杰
王晓
张龙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Petrochina Co Ltd
Petrochina Coalbed Methane Co Ltd
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Petrochina Co Ltd
Petrochina Coalbed Methane Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Petrochina Co Ltd, Petrochina Coalbed Methane Co Ltd filed Critical Petrochina Co Ltd
Priority to CN201811587452.9A priority Critical patent/CN111364926A/en
Publication of CN111364926A publication Critical patent/CN111364926A/en
Pending legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/20—Filtering

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Reciprocating Pumps (AREA)

Abstract

The invention discloses a coal slime cleaning device, and belongs to the field of coal bed gas exploitation. The device comprises a mud pump, a buffer tube, a sieve tube and a mud storage tube which are sequentially connected, wherein the mud pump comprises a piston cylinder, a fixed valve and a moving valve, the fixed valve and the moving valve are respectively arranged at two ends in the piston cylinder, at least two sieve holes are formed in the tube wall of the sieve tube, and a sealing cover is arranged on the end face of one end, far away from the sieve tube, of the mud storage tube. When the device is used, the piston movement is performed on the mud pump, so that the pressure in the buffer pipe, the sieve pipe and the mud storage pipe is smaller than the pressure in the shaft, the coal slime in the shaft can enter the sieve pipe through the sieve holes and enter the mud pump through the buffer pipe, then the coal slime entering the mud pump enters the oil pipe again, and the shaft is removed through the oil pipe, the effect that the coal slime cleaning device can be continuously cleaned by only once lowering the coal slime cleaning device is achieved, the cleaning time of the coal slime in the shaft is saved, and the working efficiency of the coal slime cleaning work is improved.

Description

Coal slime cleaning device
Technical Field
The invention relates to the technical field of coal bed gas exploitation, in particular to a coal slime cleaning device.
Background
At present, a method combining fracturing reformation and water drainage and gas production is often adopted to mine coal bed gas stored in a coal bed, and in the process of mining, coal seams are eroded by fracturing fluid and water continuously, so that coal dust is generated in seams of the coal bed. The coal dust and the water are mixed to form mixed fluid, the mixed fluid is pushed into a shaft of a gas recovery well by subsequent water flow, and is deposited and becomes sticky in the shaft, and finally coal slime is formed. Because too much coal slurry accumulated in the shaft can affect the production efficiency of the gas production well, even block a gas production channel and affect the normal production of the gas production well, a coal slurry cleaning device is needed to clean the coal slurry accumulated in the shaft in time.
The coal slime cleaning device in the related art comprises a mud storage pipe and a bailing pump, wherein the mud storage pipe is fixedly connected with one end of the bailing pump. The bailing pump is a special pump applied to an oil well for bailing operation, the bailing pump is of a piston structure, the bottom end of the bailing pump is provided with a discharge port, fluid can be discharged out of the bailing pump through the discharge port, the fluid cannot enter a piston of the bailing pump, the pump clamping phenomenon is avoided, the bottom of the mud storage pipe is of an open structure, a fixed valve is arranged in a pipe orifice, the fixed valve is a ball valve which is composed of a valve ball and a valve ball seat and can enable the fluid to flow in a one-way mode, the fixed valve can move synchronously with the piston in the bailing pump, and coal slime in a shaft can only enter the mud storage pipe from the bottom of the mud storage pipe and cannot flow out from the bottom of the mud storage pipe. When the coal slime cleaning device is used, one end, far away from the coal slime storage pipe, of the bailing pump is connected with the oil pipe, the coal slime cleaning device is placed into a coal slime position in the shaft through the oil pipe, after the coal slime cleaning work is started, the bailing pump moves through the piston to drive the fixed valve in the coal slime storage pipe to be opened or closed, so that the coal slime enters the coal slime storage pipe from the shaft, when the coal slime storage pipe is filled with the coal slime, the bailing pump stops working, the coal slime cleaning device is lifted out of the shaft through the oil lifting pipe, the coal slime filled in the coal slime storage pipe is cleaned in a manual cleaning mode, and therefore one-time coal slime cleaning work is completed.
However, since the mud storage amount of the mud storage pipe in the related art is a fixed value, the amount of the coal slime cleaned from the shaft in each coal slime cleaning operation is limited, and for the shaft with more coal slime, the coal slime in the shaft can be thoroughly cleaned by performing the coal slime cleaning operation for multiple times, so that the cleaning time is increased, and the working strength is also increased.
Disclosure of Invention
The invention provides a coal slime cleaning device, which can solve the problems that for a shaft with more coal slime, the related technology needs to carry out multiple coal slime cleaning operations, not only increases the cleaning time, but also increases the working strength. The technical scheme is as follows:
a coal slime cleaning device comprises a mud pump, a buffer tube, a sieve tube and a mud storage tube;
the first end of the mud pump is connected with the first end of the buffer tube, the mud pump comprises a piston cylinder, a fixed valve and a moving valve, the fixed valve and the moving valve are respectively arranged at two ends in the piston cylinder, the fixed valve is fixedly connected with the piston cylinder, the moving valve is movably connected with the piston cylinder, and the first end of the mud pump is the end close to the fixed valve;
the second end of the buffer tube is connected with the first end of the sieve tube, and the tube wall of the sieve tube is provided with at least two sieve holes;
the second end of the sieve tube is connected with the first end of the sludge storage tube, and a sealing cover is arranged on the end face of the second end of the sludge storage tube.
Optionally, the coal slime cleaning device further comprises a lifter;
the first end of the lifter is connected with the second end of the mud pump, the second end of the lifter is used for being connected with the oil pipe, and the lifter is used for driving the mud pump to reciprocate up and down relative to the oil pipe.
Optionally, the coal slurry cleaning device further comprises a vibrator;
the first end of the vibrator is connected with the first end of the mud storage pipe, the second end of the vibrator is connected with the second end of the sieve pipe, and the vibrator is used for driving the mud storage pipe to vibrate.
Optionally, at least one screen is disposed within the buffer tube.
Optionally, the length of the buffer pipe is greater than or equal to the sum of the lengths of the mud storage pipe and the sieve pipe.
Optionally, the buffer tube has a length in a range of 100 meters to 300 meters.
Optionally, the buffer tube has a weight ranging from 1000 kilograms to 3000 kilograms.
Optionally, each of the at least two screen openings has a width greater than 1 millimeter.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least: the coal slime cleaning device provided by the embodiment of the invention comprises a mud pump, a buffer pipe, a sieve pipe and a mud storage pipe, wherein the mud pump can make the pressure in the buffer pipe, the sieve pipe and the mud storage pipe smaller than the pressure in a shaft by piston motion, so that the coal slime in the shaft enters the sieve pipe through sieve holes of the sieve pipe, the buffer pipe can make the coal slime in the sieve pipe automatically disperse by self gravity before entering the mud pump, the occurrence probability of pump blockage accidents is reduced, and the mud pump has no drainage port, so that the coal slime entering the sieve pipe can pass through the buffer pipe to enter the mud pump, then enters an oil pipe by the mud pump and finally enters the ground by the oil pipe when the mud pump continuously makes piston motion, and the cleaning work of the coal slime in the shaft is finished. By using the coal slime cleaning device provided by the embodiment of the invention, the coal slime in the shaft can be continuously cleaned, so that the effect of cleaning all the coal slime in the shaft can be realized only by putting down the coal slime cleaning device once, the times of lifting and putting down the coal slime cleaning device are reduced, the cleaning time is saved, the cleaning efficiency is improved, and the working strength is also reduced.
Drawings
In order to illustrate the apparatus in the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.
FIG. 1 is a schematic structural diagram of a coal slurry cleaning apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another coal slime cleaning device provided by the embodiment of the invention.
Reference numerals:
1: a mud pump; 2: a buffer tube; 3: a screen pipe; 4: a sludge storage pipe; 5: a lifter; 6: a vibrator;
11: a piston cylinder; 12: fixing a valve; 13: a swimming valve; 21: screening a screen; 31: screening holes; 41: and (7) sealing the cover.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a coal slime cleaning device provided by an embodiment of the invention. As shown in fig. 1, the coal slime cleaning device includes a mud pump 1, a buffer tube 2, a sieve tube 3 and a mud storage tube 4, wherein a first end of the mud pump 1 is connected to a first end of the buffer tube 2, the mud pump 1 includes a piston barrel 11, a fixed valve 12 and a traveling valve 13, the fixed valve 12 and the traveling valve 13 are respectively disposed at two ends of the piston barrel 11, the fixed valve 12 is fixedly connected to the piston barrel 11, the traveling valve 13 is movably connected to the piston barrel 11, the first end of the mud pump 1 is an end close to the fixed valve 12, a second end of the buffer tube 2 is connected to the first end of the sieve tube 3, at least two sieve holes 31 are disposed on a tube wall of the sieve tube 3, a second end of the sieve tube 3 is connected to the first end of the mud storage tube 4, and a sealing cover 41 is disposed on an end surface of the second end of the mud storage tube 4.
When the coal slime cleaning device provided by the embodiment of the invention is used, the second end of a mud pump 1 in the coal slime cleaning device is connected with an oil pipe, the coal slime cleaning device is lowered into a shaft of a coal bed gas production well from a well head of the coal bed gas production well through the oil pipe, a screen pipe 3 in the coal slime cleaning device is positioned at the top of the coal slime accumulated in the shaft, and meanwhile, a suspension arm of a workover rig is connected with the oil pipe at the position of the well head, so that the suspension arm of the workover rig can drive the oil pipe to move up and down in the shaft when moving up and down. When the coal slime cleaning work starts, the suspension arm of the workover rig can reciprocate up and down, so that the oil pipe is driven to synchronously reciprocate up and down in the shaft, and the mud pump 1 connected with the oil pipe is driven to reciprocate up and down.
Because the mud pump 1 comprises the piston cylinder 11, the fixed valve 12 and the floating valve 13, when the mud pump 1 is in an up-stroke in up-and-down reciprocating motion, the fixed valve 12 in the piston cylinder 11 is opened, and the floating valve 13 is closed, at this time, the pressure in the buffer tube 2, the sieve tube 3 and the mud storage tube 4 is smaller than the pressure in the shaft, so that the mud pump 1 generates suction force in the buffer tube 2, the sieve tube 3 and the mud storage tube 4, and the coal slime in the shaft enters the sieve tube 3 through the sieve holes 31 and enters the piston cylinder 11 through the buffer tube 2 and the fixed valve 12. When the dredge pump 1 is in a down stroke, the fixed valve 12 in the piston cylinder 11 is closed, the floating valve 13 is opened, at the moment, the coal slurry entering the piston cylinder 11 enters the oil pipe through the floating valve 13, and when the dredge pump 1 does continuous up-and-down reciprocating motion, the coal slurry cleaning device can continuously suck the coal slurry in the shaft into the dredge pump 1 and convey the coal slurry to the ground through the oil pipe, so that the cleaning work of the coal slurry in the shaft is completed.
In addition, in the coal slime cleaning device, the buffer tube 2 is arranged, so that the coal slime entering the sieve tube 3 can be automatically dispersed by self gravity before entering the mud pump 1 to form coal slime with smaller particle size, thereby reducing the occurrence probability of pump-jamming accidents, and because the mud pump 1 is not provided with a drainage port, when the mud pump 1 continuously performs piston motion, the coal slime entering the sieve tube 3 is allowed to pass through the buffer tube 2 to enter the piston cylinder 11 of the mud pump 1, and then enters the oil pipe from the piston cylinder 11 when the floating valve 13 is opened, and when the workover rig drives the mud pump 1 to perform reciprocating motion up and down, the mud storage tube 4 can also stir the coal slime with higher consistency in a shaft, so that the coal slime with lower consistency is formed after the coal slime is fully mixed with fluid, thereby realizing the thorough cleaning of the coal slime in the shaft. In addition, when the coal slime cleaning device provided by the embodiment is used, well killing fluid is continuously injected into the shaft to keep the bottom hole pressure of the shaft to realize underbalance, so that gas outlet, overflow or blowout of the shaft is prevented, and the safety and environmental protection of operation are ensured.
The mud pump 1 is a device used for continuously pumping and conveying the coal slime accumulated in the shaft to the ground in the coal slime cleaning device. The first end of the mud pump 1 is connected with the first end of the buffer tube 2, the mud pump 1 comprises a piston cylinder 11, a fixed valve 12 and a traveling valve 13, the fixed valve 12 and the traveling valve 13 are respectively arranged at two ends in the piston cylinder 11, the fixed valve 12 is fixedly connected with the piston cylinder 11, the traveling valve 13 is movably connected with the piston cylinder 11, and the first end of the mud pump 1 is the end close to the fixed valve 12.
It should be noted that the piston cylinder 11 is a hollow body, the external shape and the internal shape of the piston cylinder 11 may be the same or different, the external shape and the internal shape of the piston cylinder 11 may be one of a cylinder or a polygonal prism, and preferably, the external shape and the internal shape of the piston cylinder 11 are the same and are both cylinders. The length of the piston cylinder 11 is determined by the amount of the coal slurry accumulated in the wellbore, and the greater the amount of the coal slurry accumulated in the wellbore, the longer the length of the piston cylinder 11 is, so as to ensure that the working time can be shortened when the same amount of the coal slurry is treated, and the length of the piston cylinder 11 is not particularly limited in the embodiment of the invention. The manufacturing material of the piston cylinder 11 may be alloy steel or carbon steel, the wall thickness of the piston cylinder 11 is determined by the material for manufacturing the piston cylinder 11, as long as it is ensured that the piston cylinder 11 does not generate structural deformation or damage when in use, and the wall thickness of the piston cylinder 11 is not specifically limited in the embodiment of the present invention. The more the inner diameter of the piston cylinder 11 is, the larger the suction force can be generated, and therefore, in order to ensure the cleaning efficiency and the success rate, the piston cylinder 11 with the larger inner diameter may be selected, and preferably, the piston cylinder 11 with the inner diameter of 70mm or 83mm may be selected as the main body of the sand pump.
Furthermore, the piston cylinder 11 can be connected to the buffer tube 2 by means of a screw connection, a clip connection or a welding connection, etc., in order to connect the first end of the dredge pump 1 to the first end of the buffer tube 2. For example, the first end of the piston cylinder 11 is provided with an internal thread and the first end of the buffer tube 2 is provided with an external thread matching the internal thread, so that the first end of the piston cylinder 11 and the first end of the buffer tube 2 are connected by means of a thread. The connection mode of the piston cylinder 11 and the oil pipe can be the same as or different from that of the piston cylinder 11 and the buffer pipe 2, as long as the piston cylinder 11 and the oil pipe can be tightly connected without leakage, so that the second end of the mud pump 1 is connected with the oil pipe.
The fixed valve 12 is a check valve that is relatively fixed in position in the piston cylinder 11 and allows only one-way fluid flow. The fixed valve 12 comprises a valve ball and a valve ball seat, the valve ball seat can be a cylinder or a polygonal column, the valve ball seat is a hollow body, the inner diameter of the valve ball seat is smaller than the outer diameter of the valve ball, so that the valve ball can be clamped on the hollow body on the surface of the valve ball seat and seals the hollow body, the valve ball can move up and down relative to the valve ball seat, and when the valve ball is separated from the contact with the valve ball seat, the hollow body of the valve ball seat is in a communication state. The valve ball seat can be fixedly connected with one end of the piston cylinder 11 by welding, screwing, bonding, clamping and the like, for example, an external thread is arranged on the outer wall of the valve ball seat, an internal thread is arranged on the inner wall of the hollow body of the piston cylinder 11, and the valve ball seat and the piston cylinder 11 are fixedly connected by screwing. The valve ball and the valve ball seat can be made of the same or different materials, and can be made of alloy steel or carbon steel, so long as the valve ball and the valve ball seat are guaranteed not to be structurally damaged when in use, and the embodiment of the invention is not particularly limited to this.
The traveling valve 13 is a check valve that is movable relative to the piston cylinder 11 in the piston cylinder 11 and allows only one-way fluid flow. The structure of the floating valve 13 and the structure of the fixed valve 12 can be the same or different. When the structure of the moving valve 13 is the same as that of the fixed valve 12, a position shifter can be arranged at one end of the piston cylinder 11, the piston cylinder 11 is movably connected with the moving valve 13 through the position shifter, and when the position shifter moves, the moving valve 13 can also be driven to move, so that the valve ball and the valve ball seat in the moving valve 13 are contacted or separated in the moving process. When the structure of the moving valve 13 is different from that of the fixed valve 12, the moving valve 13 includes not only a valve ball and a valve ball seat, but also a position mover, the position mover is disposed on the valve ball seat, and the valve ball seat is movably connected with the inner wall of the piston cylinder 11 through the position mover, so that the moving valve 13 can reciprocate up and down relative to the piston cylinder 11. In addition, the material for manufacturing the moving valve 13 may be the same or different, the material for manufacturing the moving valve 13 may be alloy steel or carbon steel, as long as it is ensured that the moving valve 13 does not have structural damage when in use, and the embodiment of the present invention is not particularly limited to this.
The buffer tube 2 is a pipe fitting which has a certain length and a certain weight, can fully and automatically disperse coal slime with larger particle size before entering the mud pump 1 through the self weight, and can aggravate the mud pump 1 so as to enable the mud pump 1 to generate stronger suction force when piston movement is performed in the coal slime cleaning device.
It should be noted that the buffer tube 2 needs a long length because the first function of the buffer tube 2 is to sufficiently self-disperse the coal slurry having a large particle diameter by its own weight before the coal slurry enters the dredge pump 1. And, the longer the whole length of the coal slime cleaning device, when cleaning the coal slime of the same position in the pit shaft, the shorter the length of the oil pipe connected to the coal slime cleaning device, and the self-dispersion of the coal slime can not be influenced by the mud storage pipe 4 and the sieve tube 3 in the coal slime cleaning device, when the mud storage pipe 4 and the sieve tube 3 are too long, the sieve tube 3 can not enter the shallower coal slime accumulated in the pit shaft, therefore, in order to make the mud storage pipe 4 and the sieve tube 3 smoothly enter the coal slime in the pit shaft, and in order to make the structure of the coal slime cleaning device more coordinated, the length of the buffer tube 2 can be greater than or equal to the sum of the lengths of the mud storage pipe 4 and the sieve tube 3. Preferably, the buffer tubes 2 may range in length from 100 meters to 300 meters.
In addition, since the second function of the buffer tube 2 is to increase the weight of the dredge pump 1, so that the dredge pump 1 generates stronger suction force when doing piston movement, the buffer tube 2 can be made of a material with higher density and higher strength, such as alloy steel, carbon steel, etc., so that the buffer tube 2 can have heavier weight at the same length. Preferably, the buffer tube 2 has a weight in the range of 1000 kg to 3000 kg in order to keep the suction force of the dredge pump 1 within an optimum range. Also, the second end of the buffer tube 2 may be connected to the first end of the screen 3 by a threading method, a clamping method, welding, or the like. For example, an external thread may be disposed on the outer wall of the second end of the buffer tube 2, and an internal thread matching the external thread of the second end of the buffer tube 2 may be disposed on the inner wall of the first end of the screen tube 3, so that the two may be connected in a threaded connection manner, as long as the two are connected tightly and no leakage occurs at the interface, which is not specifically limited in the embodiment of the present invention.
Further, as shown in fig. 2, at least one screen 21 may be further disposed in the buffer tube 2, and by disposing the screen, the coal slurry may be better dispersed in the buffer tube 2, thereby avoiding the pump jamming of the mud pump 1 due to the too large particle size of the coal slurry entering the piston cylinder 11 of the mud pump 1. The number of the mesh holes on the screen 21 and the inner diameter of each mesh hole can be determined by the inner diameters of the valve ball seats in the fixed valve 12 and the floating valve 13 in the dredge pump 1, as long as the particle size of the coal slurry passing through the screen 21 is ensured to be smaller than the inner diameters of the valve ball seats in the fixed valve 12 and the floating valve 13, and the mesh number of the screen 21 and the inner diameter of the mesh hole 31 are not specifically limited in the embodiment of the invention. The material of the screen 21 may be alloy steel, carbon steel or stainless steel, as long as it is ensured that the screen 21 is not washed, deformed and rusted by the coal slurry passing through the screen when in use, and the embodiment of the present invention is not particularly limited thereto. In addition, the more the number of the screens 21 is, the better the dispersion effect of the coal slime in the buffer tube 2 is, and the arrangement positions of the screens 21 can be arranged according to the mesh number of the screens 21 and the inner diameters of the screen holes 31 to improve the dispersion effect of the coal slime, for example, the screen 21 with the larger mesh number and the larger inner diameter of the screen holes 31 can be arranged at the end of the buffer tube 2 close to the screen pipe 3, and the screen 21 with the smaller mesh number and the smaller inner diameter of the screen holes 31 can be arranged at the end of the buffer tube 2 close to the mud pump 1.
The screen pipe 3 is a pipe fitting used for sucking coal slurry in a shaft in the coal slurry cleaning device. The screen 3 may be provided with at least two screen holes 31 so that the coal slurry in the wellbore passes through the screen holes 31 into the screen 3. The width of the sieve pore 31 is determined by the mud pump 1, the stronger the suction force generated by the mud pump 1 is, the smaller the width of the sieve pore 31 can be, and further the smaller the particle diameter of the coal slime in the sieve tube 3 is, and when the suction force of the mud pump 1 is weaker, the larger width of the sieve pore 31 can more easily make the coal slime in the shaft enter the sieve tube 3. Preferably, the width of each of the at least two holes 31 is larger than 1 mm, thereby reducing the requirement for suction force of the dredge pump 1. The screen pipe 3 can be made of alloy steel or carbon steel, the wall thickness of the screen pipe 3 is determined by the material for manufacturing the screen pipe 3, as long as the screen pipe 3 is not deformed or structurally damaged in the using process, and the embodiment of the invention is not particularly limited to this. In addition, the length of the screen pipe 3 is determined by the amount of the coal slime accumulated in the shaft, and the larger the amount of the coal slime accumulated in the shaft is, the longer the length of the screen pipe 3 can be, so that more screen holes 31 can be arranged on the screen pipe 3, and when the mud pump 1 does one-time up-and-down reciprocating motion, more coal slime enters the screen pipe 3, thereby saving the working time when cleaning the same amount of the coal slime.
The mud storage pipe 4 is a pipe fitting used for storing coal slime which cannot enter the mud pump 1 through the buffer pipe 2 in the coal slime cleaning device, and the mud storage pipe 4 can also stir the thick coal slime accumulated in the shaft when reciprocating up and down along with the coal slime cleaning device so as to dilute the thick coal slime after mixing with fluid, thereby being easily cleaned by the coal slime cleaning device. The sludge storage pipe 4 may be made of alloy steel or carbon steel, the wall thickness of the sludge storage pipe 4 is determined by the material for manufacturing the sludge storage pipe 4, and the embodiment of the present invention is not particularly limited as long as the sludge storage pipe 4 is not deformed or structurally damaged in the using process. The length of the mud storage pipe 4 is determined by the amount of the collected coal slurry in the wellbore, the larger the amount of the collected coal slurry in the wellbore, the longer the length of the mud storage pipe 4 can be so that the mud storage pipe 4 can fully agitate the collected coal slurry in the wellbore, and the sum of the length of the mud storage pipe 4 and the length of the screen pipe 3 is less than the length of the buffer pipe 2.
In addition, the first end of the mud storage pipe 4 and the second end of the screen pipe 3 can be connected by means of threads, clamps, welding or the like. For example, an external thread may be disposed on the outer wall of the second end of the screen pipe 3, and an internal thread matched with the external thread of the second end of the screen pipe 3 may be disposed on the inner wall of the first end of the sludge storage pipe 4, so that the two may be connected in a threaded connection manner, as long as the two are connected tightly and no leakage occurs at the interface, which is not specifically limited in the embodiment of the present invention. The second end of the mud storage pipe 4 is further provided with a sealing cover 41, so that the coal slime in the shaft can not directly enter the mud storage pipe 4 through the opening of the second end of the mud storage pipe 4. The outer diameter of the sealing cover 41 is the same as the outer diameter of the sludge storage pipe 4, the sealing cover 41 can be fixedly connected with the second end of the sludge storage pipe 4 in a threaded connection, welding, bonding and other manners, as long as tight connection between the sealing cover 41 and the sludge storage pipe 4 is ensured and no leakage occurs at the interface, which is not specifically limited in the embodiment of the invention.
Further, as shown in fig. 2, the coal slime cleaning apparatus may further include a lifter 5, a first end of the lifter 5 is connected to a second end of the dredge pump 1, a second end of the lifter 5 is used for being connected to the oil pipe, and the lifter 5 is used for driving the dredge pump 1 to reciprocate up and down relative to the oil pipe.
It should be noted that the mud pump 1 in the coal slurry cleaning apparatus needs to lift and lower the oil pipe by means of the workover rig to realize the up-and-down reciprocating motion of the piston, so that the investment of equipment and the workload of manpower are increased when the coal slurry in the shaft is cleaned. In the embodiment of the invention, the lifter 5 is added into the coal slime cleaning device, and the lifter 5 can reciprocate up and down in the shaft to drive the coal slime cleaning device to move, so that the piston reciprocates up and down.
The lifter 5 comprises an outer barrel, a movable sliding barrel, a motor and a controller, wherein a sliding rail is arranged on the inner wall of the outer barrel, the outer barrel is movably connected with the movable sliding barrel through the sliding rail, and the controller can control the motor to rotate and drive the movable sliding barrel to reciprocate up and down relative to the outer barrel. The first end of the movable sliding barrel in the lifter 5 can be connected with the second end of the mud pump 1 through a connection mode such as threaded connection, welding or clamping connection, and the second end of the outer barrel in the lifter 5 can be connected with an oil pipe through a connection mode such as threaded connection, welding or clamping connection, wherein the first end of the movable sliding barrel refers to the first end of the lifter 5, and the second end of the outer barrel refers to the second end of the lifter 5.
In addition, the stroke of the moving slide cylinder in the lifter 5 is determined by the stroke of the moving valve 13 in the mud pump 1 in the piston cylinder 11, as long as it is ensured that the stroke of the moving slide cylinder is greater than the stroke of the moving valve 13 in the piston cylinder 11, which is not specifically limited in the embodiment of the present invention. The frequency of the controller controlling the movable sliding cylinder to do the up-and-down reciprocating motion is determined by the performance of the piston pump, and the controller is not specifically limited in the embodiment of the invention as long as the piston pump is ensured to be beneficial to carrying coal slime during operation and the risk that the piston is stuck to the pump cylinder by the coal slime is reduced. Preferably, the controller controls the movable slide cylinder to reciprocate up and down at a frequency of 4 times/minute.
Further, as shown in fig. 2, the coal slurry cleaning device may further include a vibrator 6, a first end of the vibrator 6 is connected to a first end of the sludge storage pipe 4, a second end of the vibrator 6 is connected to a second end of the sieve pipe 3, and the vibrator 6 is configured to drive the sludge storage pipe 4 to vibrate.
The vibrator 6 is a component which drives the mud storage pipe 4 to vibrate by self-generating vibration in the coal slime cleaning device. The first end of the vibrator 6 is connected with the first end of the mud storage pipe 4 in a clamping or threaded connection mode, and the second end of the vibrator 6 is connected with the second end of the sieve pipe 3 in a clamping, welding, bonding or threaded connection mode. Shaker 6 drives the one end that the second end is connected and does not produce the vibration with screen pipe 3, and the one end of being connected with the first end that stores up mud pipe 4 produces the vibration, make shaker 6 at the during operation, to driving and storing up mud pipe 4 and producing the vibration, and do not make screen pipe 3 lead to the vibration, thereby make and store up mud pipe 4 and can not only mix about thick coal slime, can also break up thick coal slime through the mode of vibration, the dilution of thick coal slime has further been accelerated, thereby improve the cleaning efficiency to the coal slime in the pit shaft.
When the coal slurry cleaning device shown in fig. 2 is used, the second end of the lifter 5 in the coal slurry cleaning device can be connected with an oil pipe, the coal slurry cleaning device is lowered into a shaft of a coal-bed gas production well from a wellhead of the coal-bed gas production well through the oil pipe, and the sieve tube 3 in the coal slurry cleaning device is located at the top position of the accumulated coal slurry in the shaft. When cleaning work begins, the lifter 5 is arranged to lift according to a preset stroke and a preset stroke frequency, so that the mud pump 1 is driven to do up-and-down reciprocating motion according to the preset stroke and the preset stroke frequency, and as the mud pump 1 comprises the piston cylinder 11, the fixed valve 12 and the traveling valve 13, when the mud pump 1 is in an up-stroke in the up-and-down reciprocating motion, the fixed valve 12 in the piston cylinder 11 is opened, and the traveling valve 13 is closed, at the moment, the pressure in the buffer tube 2, the sieve tube 3 and the mud storage tube 4 is smaller than the pressure in a shaft, and coal slime in the shaft can enter the sieve tube 3 through the sieve holes 31 and then enter the piston cylinder 11 through the buffer tube 2 and the fixed valve 12. When the dredge pump 1 is in a down stroke, the fixed valve 12 in the piston cylinder 11 is closed, the floating valve 13 is opened, at the moment, the coal slurry entering the piston cylinder 11 enters the oil pipe through the floating valve 13, and when the dredge pump 1 does continuous up-and-down reciprocating motion, the coal slurry cleaning device can continuously suck the coal slurry in the shaft into the dredge pump 1 and convey the coal slurry to the ground through the oil pipe, so that the cleaning work of the coal slurry in the shaft is completed.
In the coal slime cleaning device, through setting up buffer tube 2, can make the coal slime that gets into in the screen pipe 3 disperse by oneself through self gravity before getting into dredge pump 1, form the coal slime that the particle diameter is less, thereby the emergence probability of card pump accident has been reduced, and, because buffer tube 2 has certain weight, can make the weight increase of dredge pump 1, thereby improve the work efficiency of dredge pump 1, and set up a plurality of screen cloth 21 in buffer tube 2 and can further disperse the coal slime, reduce the probability of card pump. And because the dredge pump 1 is not provided with a discharge port, when the dredge pump 1 continuously makes piston motion, the coal slurry entering the sieve tube 3 is allowed to pass through the buffer tube 2 to enter the piston cylinder 11 of the dredge pump 1, and then enters the oil pipe from the piston cylinder 11 when the traveling valve 13 is opened. And, when the workover rig drives the dredge pump 1 to do up-and-down reciprocating motion, the vibrator 6 also can drive the mud storage pipe 4 to produce the vibration to make the mud storage pipe 4 fully stir the higher coal slime of consistency in the pit shaft, make these coal slime and fluid fully mix the back and form the lower coal slime of consistency, and then can realize the thorough clearance to the coal slime in the pit shaft. In addition, when the coal slime cleaning device provided by the embodiment is used, well killing fluid is continuously injected into the shaft to keep the bottom hole pressure of the shaft to realize underbalance, so that gas outlet, overflow or blowout of the shaft is prevented, and the safety and environmental protection of operation are ensured.
The coal slime cleaning device provided by the embodiment of the invention comprises a mud pump, a buffer pipe, a sieve pipe and a mud storage pipe, wherein the mud pump can make the pressure in the buffer pipe, the sieve pipe and the mud storage pipe smaller than the pressure in a shaft by piston motion, so that the coal slime in the shaft enters the sieve pipe through sieve holes, the buffer pipe can make the coal slime in the sieve pipe automatically disperse by self gravity before entering the mud pump, the occurrence probability of pump blockage accidents is reduced, and the mud pump has no drainage port, so that the coal slime entering the sieve pipe can pass through the buffer pipe to enter the mud pump, then enters an oil pipe through the mud pump and finally enters the ground by the oil pipe when the mud pump continuously makes piston motion, and the cleaning work of the coal slime in the shaft is finished. By using the coal slime cleaning device provided by the embodiment of the invention, the coal slime in the shaft can be continuously cleaned, so that the effect of cleaning all the coal slime in the shaft can be realized only by putting down the coal slime cleaning device once, the times of lifting and putting down the coal slime cleaning device are reduced, the cleaning time is saved, the cleaning efficiency is improved, and the working strength is also reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. A coal slime cleaning device is characterized by comprising a mud pump (1), a buffer tube (2), a sieve tube (3) and a mud storage tube (4);
the first end of the mud pump (1) is connected with the first end of the buffer tube (2), the mud pump (1) comprises a piston cylinder (11), a fixed valve (12) and a moving valve (13), the fixed valve (12) and the moving valve (13) are respectively arranged at two ends in the piston cylinder (11), the fixed valve (12) is fixedly connected with the piston cylinder (11), the moving valve (13) is movably connected with the piston cylinder (11), and the first end of the mud pump (1) is close to the fixed valve (12);
the second end of the buffer tube (2) is connected with the first end of the sieve tube (3), and the tube wall of the sieve tube (3) is provided with at least two sieve holes (31);
the second end of the sieve tube (3) is connected with the first end of the sludge storage tube (4), and a sealing cover (41) is arranged on the end face of the second end of the sludge storage tube (4).
2. The coal slurry cleaning apparatus as recited in claim 1, characterized in that the coal slurry cleaning apparatus further comprises an elevator (5);
the first end of the lifter (5) is connected with the second end of the mud pump (1), the second end of the lifter (5) is used for being connected with an oil pipe, and the lifter (5) is used for driving the mud pump (1) to do up-and-down reciprocating motion relative to the oil pipe.
3. The coal slurry cleaning apparatus as claimed in claim 1, characterized in that the coal slurry cleaning apparatus further comprises a vibrator (6);
the first end of the vibrator (6) is connected with the first end of the mud storage pipe (4), the second end of the vibrator (6) is connected with the second end of the sieve pipe (3), and the vibrator (6) is used for driving the mud storage pipe (4) to vibrate.
4. Coal slurry cleaning apparatus according to claim 1, characterized in that at least one screen (21) is arranged inside the buffer tube (2).
5. The coal slime cleaning device according to claim 1, wherein the length of the buffer tube (2) is greater than or equal to the sum of the lengths of the sludge storage tube (4) and the sieve tube (3).
6. Coal slurry cleaning apparatus as claimed in any one of claims 1 to 5, characterized in that the buffer tube (2) has a length in the range of 100 to 300 meters.
7. Coal slurry cleaning apparatus as claimed in any one of claims 1 to 5, characterized in that the buffer tube (2) has a weight in the range of 1000 kg to 3000 kg.
8. The coal slurry cleaning apparatus as claimed in any one of the claims 1 to 5, characterized in that the width of each screen opening (31) of the at least two screen openings (31) is more than 1 mm.
CN201811587452.9A 2018-12-25 2018-12-25 Coal slime cleaning device Pending CN111364926A (en)

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Application Number Priority Date Filing Date Title
CN201811587452.9A CN111364926A (en) 2018-12-25 2018-12-25 Coal slime cleaning device

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CN111364926A true CN111364926A (en) 2020-07-03

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CN204941407U (en) * 2015-07-09 2016-01-06 中国石油天然气股份有限公司 A kind of sand pump
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2479202Y (en) * 2001-04-29 2002-02-27 中国石油天然气股份有限公司 Super-long stroke downhole bailer
CN2486734Y (en) * 2001-04-29 2002-04-17 中国石油天然气股份有限公司 Double sand holding bucket downhole bailing tub
US20060113072A1 (en) * 2002-04-19 2006-06-01 Natural Lift Systems, Inc. Wellbore pump
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Application publication date: 20200703