CN108590621B - System and method for high-pressure sand adding after hydraulic fracturing remote continuous pump in coal mine - Google Patents
System and method for high-pressure sand adding after hydraulic fracturing remote continuous pump in coal mine Download PDFInfo
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- CN108590621B CN108590621B CN201810337722.4A CN201810337722A CN108590621B CN 108590621 B CN108590621 B CN 108590621B CN 201810337722 A CN201810337722 A CN 201810337722A CN 108590621 B CN108590621 B CN 108590621B
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- 239000004576 sand Substances 0.000 title claims abstract description 413
- 239000003245 coal Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 238000005086 pumping Methods 0.000 claims abstract description 12
- 238000003860 storage Methods 0.000 claims description 148
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 48
- 238000011049 filling Methods 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 13
- 239000002893 slag Substances 0.000 claims description 12
- 238000011068 loading method Methods 0.000 claims description 9
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- 238000005299 abrasion Methods 0.000 abstract description 4
- 238000000605 extraction Methods 0.000 description 8
- 238000007599 discharging Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 5
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- 238000005065 mining Methods 0.000 description 1
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- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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Abstract
A coal mine underground hydraulic fracturing remote continuous post-pump high-pressure sand adding system and a method thereof comprise a sand adding system, a fracturing pumping system and a remote measurement and control system, wherein the fracturing pumping system comprises a fracturing pump set and a post-pump high-pressure pipeline, one end of the post-pump high-pressure pipeline is connected to an outlet of the fracturing pump set, the other end of the post-pump high-pressure pipeline is connected with a fracturing pipeline in a hole, the post-pump high-pressure pipeline is connected to the sand adding system, and the sand adding system and the fracturing pumping system are both connected to the remote measurement and control system to realize remote control; therefore, the invention adopts the pump-out end sand adding process to solve the problems of pump abrasion, small once sand adding amount, long sand adding interruption time, potential safety hazard in high-pressure operation and the like existing in the existing underground fracturing device and process, can avoid the abrasion of the pump and does not need to reform the existing underground fracturing pump. Through remote measurement and control, the continuous sand adding process is ensured, and the potential safety hazard of high-voltage operation is avoided.
Description
Technical Field
The invention relates to the technical field of yield increase of underground coal mine gas extraction, in particular to a system and a method for adding sand at high pressure after a remote continuous pump for underground coal mine hydraulic fracturing.
Background
The gas control is the key to the safety production work of coal mines. The requirements of 'temporary standard reaching regulations for coal mine gas extraction' in China are as follows: the coal seam which needs to be subjected to gas extraction must extract gas firstly, and the mining operation can be arranged after the extraction effect reaches the standard requirement, namely the coal seam is extracted first and then reaches the standard. Simultaneously, the method requires that: the coal mine gas extraction should be 'pumped to the full extent and be realized in multiple measures'.
The coal mine gas extraction mainly comprises a ground mode and an underground mode.
In surface coal bed gas wells, hydraulic fracturing has become popular as an important stimulation tool. The principle is that a ground high-pressure pump set is utilized to inject large-displacement fracturing fluid into a stratum through a drill hole to generate a crack, then sand carrying fluid with a propping agent is injected, the crack extends forwards and is filled with the propping agent, and a sand filling crack with certain geometric dimension and flow conductivity is formed in the stratum, so that the purpose of increasing the yield is achieved.
In recent years, the hydraulic fracturing production increasing technology is introduced into underground gas extraction drill holes, but the hydraulic fracturing is mainly performed by clean water, no fracture propping agent exists, fractures formed by fracturing are quickly contracted or completely closed under the action of stratum closing pressure, and the production increasing effect is not ideal. Research personnel develop exploration research on an underground sand adding fracturing pump and a matched sand adding fracturing process, but the underground sand adding fracturing pump and the matched sand adding fracturing process all belong to normal-pressure sand adding at the front end of the fracturing pump, sand enters a pump rear high-pressure pipeline from a pump outlet after passing through a pump cavity, and the sand adding process has large abrasion on the pump. At present, no report is made on the research on the post-pump sand adding process, the main reason is that potential safety hazards exist in post-pump high-pressure operation, the continuity of the sand adding operation is difficult to guarantee in a high-pressure environment, and the requirement of crack extension cannot be met.
Therefore, in view of the defects, through careful research and design, the designer of the invention researches and designs a coal mine underground hydraulic fracturing remote continuous pump post-high-pressure sand adding system and a method thereof by combining the experience and the result of the related industries for a long time to overcome the defects.
Disclosure of Invention
The invention aims to provide a system and a method for adding sand at high pressure after a coal mine underground hydraulic fracturing remote continuous pump, aiming at the problems of pump abrasion, small once sand adding amount, long sand adding interruption time, potential safety hazard in high-pressure operation and the like existing in the existing underground fracturing device and process. Through remote measurement and control, the continuous sand adding process is ensured, and the potential safety hazard of high-voltage operation is avoided.
In order to solve the problems, the invention discloses a high-pressure sand adding system behind a coal mine underground hydraulic fracturing remote continuous pump, which comprises a sand adding system, a fracturing pumping system and a remote measurement and control system, and is characterized in that:
the fracturing pumping system comprises a fracturing pump set and a post-pump high-pressure pipeline, one end of the post-pump high-pressure pipeline is connected to an outlet of the fracturing pump set, the other end of the post-pump high-pressure pipeline is connected with an in-hole fracturing pipeline, the post-pump high-pressure pipeline is connected to a sand adding system, and the sand adding system and the fracturing pumping system are both connected to a remote measurement and control system to realize remote control;
the sand adding system comprises at least two sand storage tanks, a sand filling funnel and a sand conveying conveyor belt, a high-pressure pipeline behind a pump is connected to the at least two sand storage tanks, the sand filling funnel is located below the rear end of the sand conveying conveyor belt to receive sand conveyed by the sand filling funnel, and the lower end of the sand filling funnel is connected to the sand storage tanks to input the sand into the sand storage tanks.
Wherein: at least two sand storage tanks contain first sand storage tank and second sand storage tank, first sand storage tank and second sand storage tank's structure is the same, first sand storage tank contains the high-pressure sand storage tank body, the high-pressure sand storage tank body is the big-end-up form that reduces, the internal adjustable electricity that is equipped with of high-pressure sand storage tank drives out the sand ware, and its top intermediate position is equipped with the remote control motor of adjustable electricity driven out sand ware is equipped with the exhaust hole at the top periphery, just the upper portion lateral wall of the high-pressure sand storage tank body is equipped with the sand inlet that is connected to dress sand hopper, and well upper portion lateral wall is equipped with the water inlet that is connected to into water balance pipe, and the lower part lateral wall is equipped with the row cinder notch, and the bottom is equipped with the sand outlet that is connected to high-pressure pipeline behind the pump.
Wherein: the lower extreme of the balanced connecting pipe of intaking that the water inlet of first sand storage tank is connected passes through high-pressure line behind first three way connection to the pump, the sand outlet of first sand storage tank passes through high-pressure line behind second three way connection to the pump, the sand outlet of second sand storage tank bottom passes through high-pressure line behind the third three way connection to the pump, another balanced pipe of intaking is connected to the water inlet of second sand storage tank, another balanced pipe of intaking passes through high-pressure line behind the fourth three way connection to the pump.
Wherein: the first tee is located upstream of the second tee, and the third tee is located upstream of the fourth tee.
Wherein: the gas vent is equipped with the gas vent solenoid valve, it is equipped with into sand mouth solenoid valve to advance the sand mouth, the sand mouth is equipped with out sand mouth solenoid valve, the row's cinder notch is equipped with row's cinder notch solenoid valve, the water inlet is equipped with the water inlet solenoid valve, defeated sand conveyer belt, fracturing pump package, remote control motor, gas vent solenoid valve, advance sand mouth solenoid valve, go out sand mouth solenoid valve, row's cinder notch solenoid valve and water inlet solenoid valve all are connected to long-range observing and controlling system, solenoid valve and long-range observing and controlling system all adopt the explosion-proof type.
Wherein: the top end of the sand filling funnel is provided with an opening for sand to enter, and the lower end of the sand filling funnel is respectively provided with at least two sand conveying pipes which are respectively connected to the sand inlet of the sand storage tank.
Wherein: adjustable electricity drives sand outlet ware includes that major axis, stirring vane and centrum spiral draw sand device, the upper end of major axis is connected in the transmission shaft of remote control motor, just the major axis stretches into high pressure and stores up that the sand jar is internal and be equipped with an at least stirring vane, the lower extreme of major axis is connected to centrum spiral and draws sand device.
Wherein: the upper part of the conical spiral sand guiding device is thick and gradually thins downwards, and a spiral blade or a spiral groove is welded on the conical body of the whole conical spiral sand guiding device so as to guide input sand and pumped water into a high-pressure pipeline behind the pump through a sand outlet.
The method for the high-pressure sand adding system behind the coal mine underground hydraulic fracturing remote continuous pump is further disclosed, and is characterized by comprising the following steps:
the method comprises the following steps: starting the remote measurement and control system, and enabling the remote control motor and each electromagnetic valve to be in a closed state;
step two: opening an exhaust port electromagnetic valve and a slag discharge port electromagnetic valve of the first sand storage tank, and emptying the sand storage tank body; closing the electromagnetic valve of the slag discharge port, opening the electromagnetic valve of the sand inlet, opening the sand conveying belt, loading the measured sand amount into the first sand storage tank, closing the electromagnetic valve of the air outlet and the electromagnetic valve of the sand inlet of the first sand storage tank, and closing the sand conveying belt to finish sand storage of the first sand storage tank;
step three: carrying out the same sand storage operation on the second sand storage tank to finish the sand storage of the second sand storage tank;
step four: firstly opening the water inlet electromagnetic valve of the first sand storage tank, then opening the sand outlet electromagnetic valve, then starting the remote motor, starting the sand adding operation of the first sand storage tank, and when the residual sand amount in the tank is less than 0.05m3When the first sand storage tank is closedThe sand outlet electromagnetic valve and the water inlet electromagnetic valve complete the single sand adding of the first sand storage tank;
step five: carrying out the same sand adding operation on the second sand storage tank to finish the single sand adding operation of the second sand storage tank, and carrying out the sand storage operation of the first sand storage tank while carrying out the single sand adding operation of the second sand storage tank;
step six: and repeating the second to the fifth steps until the whole sand adding operation is finished.
By the structure, the system and the method for adding the sand at the high pressure behind the coal mine underground hydraulic fracturing remote continuous pump have the following effects:
(1) in the high-pressure pipeline at the outlet end of the pump, a tee joint is used for connecting a water inlet balance pipe, the water inlet balance pipe is connected with a water inlet of a sand storage tank, a sand (water) outlet of the sand storage tank is connected back to the high-pressure pipeline by the tee joint, a water inlet loop and a water outlet loop are formed in the sand storage tank and the high-pressure pipeline, the pressure balance in the sand storage tank and the high-pressure pipeline can be kept, and a pressure balance condition is created for high-pressure sand adding.
(2) In the high-pressure pipeline, 2 (or n) high-pressure sand storage tanks are connected in the above mode. After the sand of the first sand storage tank A is added, the standby second sand storage tank B is started, and the first sand storage tank A stores the sand synchronously during the sand adding operation of the standby second sand storage tank B. The two sand adding tanks perform reciprocating operation in such a way, so that the continuity of adding sand in the high-pressure pipeline at the pump outlet end is guaranteed.
(3) The upper part of the high-pressure sand storage tank body is provided with a sand inlet and an air outlet, the lower part of the high-pressure sand storage tank body is provided with a slag discharge port, a water inlet and a sand outlet, a remote control high-pressure electromagnetic valve is installed at each inlet (outlet) position, and the switch of the electromagnetic valve is controlled by a remote measurement and control system.
(4) The remote control electric driven sand discharging device penetrates through the high-pressure tank body along the central axis. The remote control electric driven sand discharging device consists of a remote control motor, a long shaft, a stirring blade and a centrum spiral sand guiding device. The motor transmission shaft is connected with the rotating long shaft and penetrates through the high-pressure tank body for high-pressure sealing treatment. During the sand adding operation, the motor drives the long shaft to rotate to transmit torque, the stirring blades rotate to loosen and mix sand, and the conical spiral rotates to lead sand out of the tank. The sand addition rate is regulated by the motor speed.
(5) The sand inlet funnel is connected with the high-pressure sand storage tank in a one-inlet and two-outlet 'underpants-shaped' connection mode, and a convenient condition is provided for sand filling at a fixed position of the conveyor belt.
(6) The sand conveying of the conveying belt adopts a discontinuous mode, the conveying belt is opened during the sand storage operation, the sand enters the tank body through the conveying belt, the sand loading hopper and the sand inlet, and the conveying belt is stopped after the sand is loaded to the designed position. The start and stop of the conveyor belt are controlled by a remote measurement and control system.
The details of the present invention can be obtained from the following description and the attached drawings.
Drawings
FIG. 1 shows a schematic diagram of a high-pressure sand adding system behind a coal mine underground hydraulic fracturing remote continuous pump.
Reference numerals:
A. a first sand storage tank; B. a second sand storage tank; C. a fracturing pump unit; D. filling a sand hopper; E. a sand conveying conveyor belt; F. a remote measurement and control system; G. a post-pump high pressure conduit; 1. a first tee joint; 2. a second tee joint; 3. a third tee joint; 4. a fourth tee joint; 5. a water inlet balance pipe; 6. a high-pressure sand storage tank; 7. an exhaust port; 8. a sand inlet; 9. a sand outlet; 10. a slag discharge port; 11. a water inlet; 12. an exhaust port solenoid valve; 13. a sand inlet solenoid valve; 14. a sand outlet electromagnetic valve; 15. a slag discharge port electromagnetic valve; 16. a water inlet solenoid valve; 17. a long axis; 18. a stirring blade; 19. a centrum spiral sand guiding device; 20. a remote control motor; 21. and (6) drilling.
Detailed Description
Referring to fig. 1, a high-pressure sand adding system behind a coal mine underground hydraulic fracturing remote continuous pump is shown.
The high-pressure sand adding system behind the coal mine underground hydraulic fracturing remote continuous pump can comprise a sand adding system, a fracturing pumping system and a remote measurement and control system, the fracturing pumping system can comprise a fracturing pump set C and a high-pressure pipeline G behind the pump, one end of the high-pressure pipeline G behind the pump is connected to an outlet of the fracturing pump set C, a fracturing pipeline in a connecting hole at the other end of the high-pressure pipeline G is connected to the sand adding system, and the sand adding system and the fracturing pumping system are both connected to the remote measurement and control system to achieve remote control.
The sand adding system can comprise at least two sand storage tanks, a sand loading funnel D and a sand conveying conveyor belt E, the high-pressure pipeline G behind the pump is connected to the at least two sand storage tanks, the sand loading funnel D is located below the rear end of the sand conveying conveyor belt E and used for receiving sand conveyed by the sand loading funnel D, and the lower end of the sand loading funnel D is connected to the sand storage tanks so as to input the sand into the sand storage tanks.
Wherein, two at least sand storage tank contain first sand storage tank A and second sand storage tank B, first sand storage tank A and second sand storage tank B's structure is the same, uses first sand storage tank A as an example, first sand storage tank A contains high-pressure sand storage tank body 6, high-pressure sand storage tank body 6 is the reduction form of big end down, and its internal capacity is preferred 0.8m3An adjustable electric sand ejector is arranged in the high-pressure sand storage tank body 6, a remote control motor 20 of the adjustable electric sand ejector is arranged at the middle position of the top of the high-pressure sand storage tank body 6, an exhaust hole 7 is arranged at the periphery of the top of the high-pressure sand storage tank body 6, a sand inlet 8 connected to a sand filling funnel D is arranged on the upper side wall of the high-pressure sand storage tank body 6, a water inlet 11 connected to a water inlet balance pipe 5 is arranged on the middle upper side wall, a slag discharge port 10 is arranged on the lower side wall, a sand outlet 9 connected to a post-pump high-pressure pipeline G is arranged at the bottom end of the high-pressure sand storage tank body 6, the lower end of the water inlet balance connecting pipe 5 is connected to the post-pump high-pressure pipeline G through a first tee joint 1, the sand outlet 9 is connected to the post-pump high-pressure pipeline G through a second tee joint 2, an exhaust port electromagnetic valve 12 is arranged on the exhaust hole, the water inlet 11 is equipped with water inlet solenoid valve 16, wherein, the sand outlet 9 of second sand storage tank B bottom is through third three way connection to high-pressure line G behind the pump, another balanced pipe of intaking is connected to the water inlet of second sand storage tank B, another balanced pipe of intaking is through fourth three way connection to high-pressure line behind the pump.
The sand conveying conveyor belt E, the fracturing pump unit C, the remote control motor 20, the exhaust port electromagnetic valve 12, the sand inlet electromagnetic valve 13, the sand outlet electromagnetic valve 14, the slag discharge port electromagnetic valve 15 and the water inlet electromagnetic valve are all connected to a remote measurement and control system F. The electromagnetic valve and the remote measurement and control system are explosion-proof.
Optionally, the first tee 1 is located upstream of the second tee 2, and the third tee 3 is located upstream of the fourth tee 4.
Optionally, the top end of the sand filling funnel D is provided with an opening for sand to enter, and the lower end of the sand filling funnel D is provided with at least two sand conveying pipes respectively to be connected to the sand inlet of the sand storage tank.
The adjustable electric sand ejector can comprise a long shaft 17, a stirring blade 18 and a conical spiral sand guiding device 19, wherein the upper end of the long shaft 17 is connected to a transmission shaft of a remote control motor 20, the long shaft 17 extends into the high-pressure sand storage tank body 6 and is provided with at least one stirring blade, the lower end of the long shaft 17 is connected to the conical spiral sand guiding device 19, the upper part of the conical spiral sand guiding device 19 is thick and gradually thinned downwards, the conical body of the whole conical spiral sand guiding device 19 is welded with the spiral blade or is provided with a spiral groove in a washing mode, so that input sand and pumped water are guided into a post-pump high-pressure pipeline through a sand outlet.
And a high-pressure sealing structure is arranged between the long shaft 17 and the high-pressure sand storage tank body 6.
Wherein the stirring blade 18 is installed at the center of the long shaft 17.
As shown in figure 1, after the system finishes the underground gas extraction drilled hole 21 of drilling construction and is provided with necessary in-hole fracturing pipelines and orifice devices, a fracturing high-pressure pipe G and a fracturing pump set C are sequentially connected from an orifice to the outside.
The remote measurement and control system F performs motor switching and rotating speed regulation on the remote control motor 20, starts and stops the sand conveying conveyor belt, and performs single-tank sand adding timing, residual sand amount calculation and accumulated sand adding amount calculation on each sand storage tank, on-off control on each electromagnetic valve and the like.
The invention also relates to a method for adding sand under high pressure after the coal mine underground hydraulic fracturing remote continuous pump, which is realized by the system, and the specific method comprises the following steps:
the method comprises the following steps: and starting the remote measurement and control system, and closing the remote control motor and each electromagnetic valve.
Step two: opening an electromagnetic valve of an exhaust port and a slag discharge port of the first sand storage tank AThe electromagnetic valve is used for emptying the sand storage tank body; closing the electromagnetic valve of the slag discharge port, opening the electromagnetic valve of the sand inlet, opening the sand conveying conveyor belt, and metering in advance (preferably 0.5 m)3) And (4) loading the sand amount into the first sand storage tank A, closing an air outlet electromagnetic valve and a sand inlet electromagnetic valve of the first sand storage tank A, and closing the sand conveying conveyor belt. At this time, the sand storage of the first sand storage tank a is completed.
Step three: and carrying out the same sand storage operation on the second sand storage tank B to finish the sand storage of the second sand storage tank B.
Step four: opening a water inlet electromagnetic valve of a first sand storage tank A, then opening a sand outlet electromagnetic valve, and then starting a remote motor to start sand adding operation; the remote measurement and control system calculates the sand adding amount and the residual sand amount in the tank through the rotating speed (corresponding to the sand adding speed) of the remote motor and the sand adding time of the single tank, and when the residual sand amount in the tank is less than 0.05m3And when the sand is discharged, the sand outlet electromagnetic valve and the water inlet electromagnetic valve of the first sand storage tank A are closed. At this time, the single sand adding of the first sand storage tank A is completed.
Step five: and (4) carrying out the same sand adding operation on the second sand storage tank B to finish the single sand adding operation of the second sand storage tank B, and carrying out the sand storage operation of the first sand storage tank A while carrying out the single sand adding operation of the second sand storage tank B (namely, step two).
Step six: and repeating the second to the fifth steps until the whole sand adding operation is finished.
Therefore, the invention does not need to transform the existing fracturing pump, and realizes the purposes of intermittent sand conveying of the conveying belt, normal-pressure sand pressing of the sand storage tank, sand mixing of the stirring blades, conical spiral sand discharging and continuous automatic sand adding in a high-pressure pipeline at the outlet end by opening and closing the remote control motor and the multiple groups of high-pressure remote control electromagnetic valves. The advantages are that:
(1) in the high-pressure pipeline at the outlet end of the pump, a tee joint is used for connecting a water inlet balance pipe, the water inlet balance pipe is connected with a water inlet of a sand storage tank, a sand (water) outlet of the sand storage tank is connected back to the high-pressure pipeline by the tee joint, a water inlet loop and a water outlet loop are formed in the sand storage tank and the high-pressure pipeline, the pressure balance in the sand storage tank and the high-pressure pipeline can be kept, and a pressure balance condition is created for high-pressure sand adding.
(2) In the high-pressure pipeline, 2 (or n) high-pressure sand storage tanks are connected in the above mode. After the sand of the first sand storage tank A is added, the standby second sand storage tank B is started, and the first sand storage tank A stores the sand synchronously during the sand adding operation of the standby second sand storage tank B. The two sand adding tanks perform reciprocating operation in such a way, so that the continuity of adding sand in the high-pressure pipeline at the pump outlet end is guaranteed.
(3) The upper part of the high-pressure sand storage tank body is provided with a sand inlet and an air outlet, the lower part of the high-pressure sand storage tank body is provided with a slag discharge port, a water inlet and a sand outlet, a remote control high-pressure electromagnetic valve is installed at each inlet (outlet) position, and the switch of the electromagnetic valve is controlled by a remote measurement and control system.
(4) The remote control electric driven sand discharging device penetrates through the high-pressure tank body along the central axis. The remote control electric driven sand discharging device consists of a remote control motor, a long shaft, a stirring blade and a centrum spiral sand guiding device. The motor transmission shaft is connected with the rotating long shaft and penetrates through the high-pressure tank body for high-pressure sealing treatment. During the sand adding operation, the motor drives the long shaft to rotate to transmit torque, the stirring blades rotate to loosen and mix sand, and the conical spiral rotates to lead sand out of the tank. The sand addition rate is regulated by the motor speed.
(5) The sand inlet funnel is connected with the high-pressure sand storage tank in a one-inlet and two-outlet 'underpants-shaped' connection mode, and a convenient condition is provided for sand filling at a fixed position of the conveyor belt.
(6) The sand conveying of the conveying belt adopts a discontinuous mode, the conveying belt is opened during the sand storage operation, the sand enters the tank body through the conveying belt, the sand loading hopper and the sand inlet, and the conveying belt is stopped after the sand is loaded to the designed position. The start and stop of the conveyor belt are controlled by a remote measurement and control system.
It should be apparent that the foregoing description and illustrations are by way of example only and are not intended to limit the present disclosure, application or uses. While embodiments have been described in the embodiments and depicted in the drawings, the present invention is not limited to the particular examples illustrated by the drawings and described in the embodiments as the best mode presently contemplated for carrying out the teachings of the present invention, and the scope of the present invention will include any embodiments falling within the foregoing description and the appended claims.
Claims (9)
1. The utility model provides a high pressure adds sand system behind long-range continuous pump of colliery underground hydraulic fracturing, contains and adds sand system, fracturing pumping system and long-range system of observing and controling, its characterized in that:
the fracturing pumping system comprises a fracturing pump set and a post-pump high-pressure pipeline, one end of the post-pump high-pressure pipeline is connected to an outlet of the fracturing pump set, the other end of the post-pump high-pressure pipeline is connected with an in-hole fracturing pipeline, the post-pump high-pressure pipeline is connected to a sand adding system, and the sand adding system and the fracturing pumping system are both connected to a remote measurement and control system to realize remote control;
the sand adding system comprises at least two sand storage tanks, a sand filling funnel and a sand conveying conveyor belt, a high-pressure pipeline behind a pump is connected to the at least two sand storage tanks, the sand filling funnel is located below the rear end of the sand conveying conveyor belt to receive sand conveyed by the sand filling funnel, and the lower end of the sand filling funnel is connected to the sand storage tanks to input the sand into the sand storage tanks.
2. The coal mine underground hydraulic fracturing remote continuous pump post-high-pressure sand adding system according to claim 1, characterized in that: at least two sand storage tanks contain first sand storage tank and second sand storage tank, first sand storage tank and second sand storage tank's structure is the same, first sand storage tank contains the high pressure sand storage tank jar body, the high pressure sand storage tank jar body is the big-end-up form that reduces, the internal adjustable electricity that is equipped with of high pressure sand storage tank jar drives out the sand ware, and its top intermediate position is equipped with the remote control motor of adjustable electricity driven out sand ware is equipped with the gas vent at the top periphery, just the upper portion lateral wall of the high pressure sand storage tank jar body is equipped with the sand inlet that is connected to dress sand hopper, and well upper portion lateral wall is equipped with the water inlet that is connected to into water balance pipe, and the lower part lateral wall is equipped with the row's of cinder notch, and the bottom is equipped with the sand outlet that is connected to high-pressure pipeline behind the pump.
3. The coal mine underground hydraulic fracturing remote continuous pump post-high-pressure sand adding system according to claim 2, characterized in that: the lower extreme of the balanced connecting pipe of intaking that the water inlet of first sand storage tank is connected passes through high-pressure line behind first three way connection to the pump, the sand outlet of first sand storage tank passes through high-pressure line behind second three way connection to the pump, the sand outlet of second sand storage tank bottom passes through high-pressure line behind the third three way connection to the pump, another balanced pipe of intaking is connected to the water inlet of second sand storage tank, another balanced pipe of intaking passes through high-pressure line behind the fourth three way connection to the pump.
4. The coal mine underground hydraulic fracturing remote continuous pump post-high-pressure sand adding system according to claim 3, characterized in that: the first tee is located upstream of the second tee, and the third tee is located upstream of the fourth tee.
5. The coal mine underground hydraulic fracturing remote continuous pump post-high-pressure sand adding system according to claim 2, characterized in that: the gas vent is equipped with the gas vent solenoid valve, it is equipped with into sand mouth solenoid valve to advance the sand mouth, the sand mouth is equipped with out sand mouth solenoid valve, the row's cinder notch is equipped with row's cinder notch solenoid valve, the water inlet is equipped with the water inlet solenoid valve, defeated sand conveyer belt, fracturing pump package, remote control motor, gas vent solenoid valve, advance sand mouth solenoid valve, go out sand mouth solenoid valve, row's cinder notch solenoid valve and water inlet solenoid valve all are connected to long-range observing and controlling system, solenoid valve and long-range observing and controlling system all adopt the explosion-proof type.
6. The coal mine underground hydraulic fracturing remote continuous pump post-high-pressure sand adding system according to claim 1, characterized in that: the top end of the sand filling funnel is provided with an opening for sand to enter, and the lower end of the sand filling funnel is respectively provided with at least two sand conveying pipes which are respectively connected to the sand inlet of the sand storage tank.
7. The coal mine underground hydraulic fracturing remote continuous pump post-high-pressure sand adding system according to claim 2, characterized in that: adjustable electricity drives sand outlet ware includes that major axis, stirring vane and centrum spiral draw sand device, the upper end of major axis is connected in the transmission shaft of remote control motor, just the major axis stretches into high pressure and stores up that the sand jar is internal and be equipped with an at least stirring vane, the lower extreme of major axis is connected to centrum spiral and draws sand device.
8. The coal mine underground hydraulic fracturing remote continuous pump post-high-pressure sand adding system according to claim 7, characterized in that: the upper part of the conical spiral sand guiding device is thick and gradually thins downwards, and a spiral blade or a spiral groove is welded on the conical body of the whole conical spiral sand guiding device so as to guide input sand and pumped water into a high-pressure pipeline behind the pump through a sand outlet.
9. The method for the high-pressure sand adding system after the coal mine underground hydraulic fracturing remote continuous pump according to any one of claims 1 to 8, characterized by comprising the following steps:
the method comprises the following steps: starting the remote measurement and control system, and enabling the remote control motor and each electromagnetic valve to be in a closed state;
step two: opening an exhaust port electromagnetic valve and a slag discharge port electromagnetic valve of the first sand storage tank, and emptying the sand storage tank body; closing the electromagnetic valve of the slag discharge port, opening the electromagnetic valve of the sand inlet, opening the sand conveying belt, loading the measured sand amount into the first sand storage tank, closing the electromagnetic valve of the air outlet and the electromagnetic valve of the sand inlet of the first sand storage tank, and closing the sand conveying belt to finish sand storage of the first sand storage tank;
step three: carrying out the same sand storage operation on the second sand storage tank to finish the sand storage of the second sand storage tank;
step four: firstly opening the water inlet electromagnetic valve of the first sand storage tank, then opening the sand outlet electromagnetic valve, then starting the remote motor, starting the sand adding operation of the first sand storage tank, and when the residual sand amount in the tank is less than 0.05m3When the sand is filled, closing a sand outlet electromagnetic valve and a water inlet electromagnetic valve of the first sand storage tank to finish the single sand filling of the first sand storage tank;
step five: carrying out the same sand adding operation on the second sand storage tank to finish the single sand adding operation of the second sand storage tank, and carrying out the sand storage operation of the first sand storage tank while carrying out the single sand adding operation of the second sand storage tank;
step six: and repeating the second to the fifth steps until the whole sand adding operation is finished.
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| CN109779598A (en) * | 2019-02-26 | 2019-05-21 | 三一石油智能装备有限公司 | Conveying device, mixing and conveying system and method |
| CN111255430A (en) * | 2020-03-18 | 2020-06-09 | 淮南矿业(集团)有限责任公司 | Hydraulic sand fracturing system and fracturing method |
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