CN106640024B - Closed sand mixing device and method - Google Patents
Closed sand mixing device and method Download PDFInfo
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- CN106640024B CN106640024B CN201710021365.6A CN201710021365A CN106640024B CN 106640024 B CN106640024 B CN 106640024B CN 201710021365 A CN201710021365 A CN 201710021365A CN 106640024 B CN106640024 B CN 106640024B
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- 239000004576 sand Substances 0.000 title claims abstract description 139
- 238000002156 mixing Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims description 9
- 239000007788 liquid Substances 0.000 claims abstract description 89
- 239000007789 gas Substances 0.000 claims abstract description 53
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000007791 liquid phase Substances 0.000 claims abstract description 36
- 239000012071 phase Substances 0.000 claims abstract description 36
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 20
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 20
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 13
- 238000011049 filling Methods 0.000 claims abstract description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 49
- 230000001502 supplementing effect Effects 0.000 claims description 27
- 229910052757 nitrogen Inorganic materials 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 18
- 238000001802 infusion Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 239000007792 gaseous phase Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/712—Feed mechanisms for feeding fluids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/75—Discharge mechanisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/75—Discharge mechanisms
- B01F35/754—Discharge mechanisms characterised by the means for discharging the components from the mixer
- B01F35/75455—Discharge mechanisms characterised by the means for discharging the components from the mixer using a rotary discharge means, e.g. a screw beneath the receptacle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F2025/91—Direction of flow or arrangement of feed and discharge openings
- B01F2025/919—Direction of flow or arrangement of feed and discharge openings characterised by the disposition of the feed and discharge openings
- B01F2025/9191—Direction of flow or arrangement of feed and discharge openings characterised by the disposition of the feed and discharge openings characterised by the arrangement of the feed openings for one or more flows, e.g. for the mainflow and the flow of an additional component
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F2025/91—Direction of flow or arrangement of feed and discharge openings
- B01F2025/919—Direction of flow or arrangement of feed and discharge openings characterised by the disposition of the feed and discharge openings
- B01F2025/9191—Direction of flow or arrangement of feed and discharge openings characterised by the disposition of the feed and discharge openings characterised by the arrangement of the feed openings for one or more flows, e.g. for the mainflow and the flow of an additional component
- B01F2025/919125—Direction of flow or arrangement of feed and discharge openings characterised by the disposition of the feed and discharge openings characterised by the arrangement of the feed openings for one or more flows, e.g. for the mainflow and the flow of an additional component with feed openings in the center and at the circumference of the main flow
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/49—Mixing drilled material or ingredients for well-drilling, earth-drilling or deep-drilling compositions with liquids to obtain slurries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Accessories For Mixers (AREA)
Abstract
The invention provides a closed sand mixing device which comprises a frame, a tank body arranged in the frame and a main manifold arranged below the tank body, wherein the tank body is a horizontal pressure tank, the top of the tank body is provided with a gas phase channel, the top of the tank body is provided with a plurality of sand filling ports, the bottom of the tank body is provided with a liquid phase channel, the bottom of the tank body is provided with a plurality of sand outlets, the inner bottom surface of the tank body is provided with a plurality of sand conveying devices, the sand outlets and the sand conveying devices are in one-to-one correspondence, one end of each sand outlet is communicated with an outlet of each sand conveying device, the other end of each sand outlet is communicated with the main manifold, each sand conveying device is connected with an electric control cabinet, the upper part of the tank body is provided with a gas phase discharge manifold, and the gas phase discharge manifold is provided with a gas phase discharge valve. The liquid carbon dioxide or other liquefied gases and the propping agent can be mixed according to a certain proportion and then output under the condition of closed pressure, and the sand mixing liquid with a certain sand ratio is provided for the fracturing truck.
Description
Technical Field
The invention belongs to the technical field of underground operation fracturing, and particularly relates to a closed sand mixing device and a closed sand mixing method.
Background
The low-permeability oil-gas reservoir has the characteristics of low porosity, low permeability, low abundance, fine pore throat and strong water lock damage, and the water lock damage of the large-scale hydraulic fracturing technology of the currently adopted water-based fracturing fluid is large and difficult to flowback. The carbon dioxide dry sand fracturing technology is used as one of anhydrous fracturing technologies, and has good applicability to low-permeability and low-pressure oil and gas reservoirs. The technology can realize 'waterless fracturing', eliminate water sensitivity and water lock damage of a reservoir and improve the fracturing modification effect; the fracturing fluid has no residues, and can protect a reservoir and support fractures; and the automatic and quick flow-back is realized. The flow-back period can be greatly shortened; the fracturing of shale gas and coal bed gas can promote the desorption of adsorbed natural gas. In addition, by recycling the carbon dioxide gas, a large amount of water for fracturing operation can be saved, and the workload of treating flowback fluid in conventional fracturing operation is reduced; the pressed waste liquid is not produced, so that the waste liquid treatment link is eliminated, and the cost is reduced; the comprehensive utilization of the carbon dioxide waste gas can realize circular economy. Particularly, the method is used for volume fracturing of dense gas and shale gas at present, the fracturing scale usually reaches thousands of square sands and thousands of square liquids, and the water-saving effect and the reduction of waste liquid treatment have great significance.
The core technology in the carbon dioxide dry sand fracturing technology is to output liquid carbon dioxide and solid particles (hereinafter referred to as propping agents) after mixing the liquid carbon dioxide and the solid particles according to a certain proportion under the condition of closed pressure, so that the key point for solving the problem is whether the carbon dioxide dry sand fracturing technology can be successful or not.
Disclosure of Invention
The invention aims to provide a closed sand mixing device which can be used for mixing liquid carbon dioxide or other liquefied gases with a propping agent according to a certain proportion and then outputting the mixture under the condition of closed pressure to provide a sand mixing liquid with a certain sand ratio for a fracturing truck.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides an airtight mulling device, includes the frame, locates the jar body in the frame and locates jar body below the main manifold, jar body is horizontal overhead tank, jar body top is equipped with the gas phase passageway, is equipped with a plurality of sand-loading mouths on the top, and the bottom is equipped with the liquid phase passageway, is equipped with a plurality of sand outlets on the bottom, be equipped with a plurality of sand conveying devices on jar internal bottom surface, sand outlet and sand conveying device one-to-one, sand outlet one end is linked together with sand conveying device's export, and the other end is linked together with the main manifold, sand conveying device is connected with the electric cabinet, jar body upper portion is equipped with gaseous phase discharge manifold, is equipped with gaseous phase discharge valve on this gaseous phase discharge manifold.
The inlet of main manifold is equipped with fluid infusion manifold, flowmeter and differential pressure valve along liquid flow direction in proper order, fluid infusion manifold and jar body middle part intercommunication are equipped with the fluid infusion valve on this fluid infusion manifold, flowmeter, fluid infusion manifold all are connected with automatically controlled cabinet electricity.
The tank body is a movable horizontal pressure tank, the tank body is provided with a pressure sensor and a temperature sensor, the tank body is externally provided with a heat preservation layer, and the pressure sensor and the temperature sensor are both electrically connected with the electric control cabinet.
The device comprises a tank body and is characterized in that a nitrogen pressurization manifold is arranged on the upper portion of the tank body, a nitrogen pressurization valve is arranged on the nitrogen pressurization manifold, a liquid phase discharge manifold is arranged at the bottom of the tank body, a liquid phase discharge valve is arranged on the liquid phase discharge manifold, and the nitrogen pressurization valve and the liquid phase discharge valve are both electrically connected with an electric control cabinet.
And the parts of the gas phase discharge manifold, the nitrogen pressurization manifold, the liquid phase discharge manifold, the liquid supplementing manifold and the tank body which are communicated are respectively provided with a filtering device.
The sand conveying device is a sand conveying screw, the sand conveying screw comprises a screw shaft and a motor, the screw of the screw shaft consists of a forward-rotation-direction screw part and a reverse-rotation-direction screw part, an optical axis between the forward-rotation-direction screw part and the reverse-rotation-direction screw part is aligned with the sand outlet, and the motor is electrically connected with the electric control cabinet.
The invention also provides a closed sand mixing method, which adopts a closed sand mixing device and comprises the following steps:
step 1), pressurizing: a propping agent is filled in the tank body through the sand filling port, a gas phase channel of the tank body is communicated with a liquid storage tank of carbon dioxide or other gases for pressurizing, so that the pressure of the tank body is consistent with the pressure of the liquid storage tank;
step 2) cooling: after the pressure of the tank body is consistent with the pressure of the liquid storage tank, closing a gas phase channel of the tank body, opening a liquid phase channel of the tank body to enable carbon dioxide or other gas liquid phases to enter, opening a gas phase discharge valve to exhaust gas, and cooling the tank body and the propping agent;
step 3), liquid filling: keeping the gas-phase discharge valve to exhaust, gradually raising the liquid level after the tank body and the propping agent are cooled, stopping filling liquid when the liquid level is raised to be higher than the sand surface height, and closing the gas-phase discharge valve;
step 4), sand mixing: and simultaneously opening a plurality of sand conveying devices, setting the sand conveying speed of the sand conveying devices according to the construction sand ratio, and adjusting the opening of a liquid supplementing valve by an electric control cabinet according to the sand conveying speed to ensure that the liquid volume of carbon dioxide or other gases entering the tank body through a liquid supplementing manifold is consistent with the volume of the sand mulling liquid output from the tank body, and the sand mulling liquid enters the fracturing truck through a liquid outlet of a main manifold.
The invention has the beneficial effects that:
1. the closed sand mixing device provided by the invention adopts a horizontal layout, and under the condition of equal volume and equal sand conveying capacity, the sand conveying speed can be increased by additionally arranging the number of sand conveying screws and reducing the rotating speed of the screws, and the sealing failure caused by overhigh rotating speed of the screws is reduced;
2. the sand conveying screw is driven by a motor, can realize a stepless speed regulation function under the condition of low rotating speed and large torque output, and occupies less space than a hydraulic station under the condition of fully ensuring the volume of the device;
3. the liquid inlet end of the main pipe manifold is provided with a liquid supplementing pipe manifold, liquid supplementing can be carried out when sand conveying from inside to outside of the tank body is achieved, the opening size of a differential pressure valve can be adjusted, certain pressure difference is generated between the front of the valve and the rear of the valve, certain friction resistance is generated on the main pipe manifold, a part of liquid of the main pipe manifold enters the tank body through the liquid supplementing pipe manifold, the purpose of liquid supplementing is achieved, the opening of the liquid supplementing valve is adjusted according to the spiral sand conveying amount, the liquid supplementing amount and the sand conveying amount are basically balanced, and stable sand ratio is achieved.
The following will be described in further detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. a frame; 2. a tank body; 3. filling a sand port; 4. a heat-insulating layer; 5. a gas phase exhaust manifold; 6. a gas phase discharge valve; 7. gas and liquid phase discharge ports; 8. an electric control cabinet; 9. b, a motor; 10. a liquid phase discharge valve; 11. a liquid outlet; 12. b, conveying sand spirally; 13. a liquid phase discharge manifold; 14. b, a sand outlet; 15. a main manifold; 16. a sand outlet; 17. a, conveying sand spirally; 18. a differential pressure valve; 19. a flow meter; 20. A liquid inlet; 21. a fluid infusion valve; 22. a nitrogen pressurization interface; 23. a nitrogen pressurization manifold; 24. a, a motor; 25. a fluid infusion manifold; 26. a temperature sensor; 27. a pressure sensor; 28. a nitrogen pressurization valve.
Detailed Description
Example 1:
this embodiment provides an airtight mulling device, including frame 1, locate the jar body 2 in the frame 1 and locate jar body 2 below the main manifold 15, jar body 2 is horizontal overhead tank, 2 tops of jar body are equipped with the gas phase passageway, are equipped with a plurality of dress sand mouths 3 on the top, and the bottom is equipped with the liquid phase passageway, is equipped with a plurality of sand outlets on the bottom, be equipped with a plurality of sand conveying devices on the bottom of jar body 2, sand outlet and sand conveying device one-to-one, sand outlet one end is linked together with sand conveying device's export, and the other end is linked together with main manifold 15, sand conveying device is connected with automatically controlled cabinet 8, 2 upper portions of jar body are equipped with gas phase discharge manifold 5, are equipped with gas phase discharge valve 6 on this gas phase discharge manifold 5.
The closed sand mixing device is connected between the carbon dioxide liquid storage tank and the fracturing truck, a propping agent is filled in the tank body 2 through the sand filling port 3, liquid-phase carbon dioxide enters the tank body 2 through the liquid-phase channel, and after forming sand mixing liquid, the mixed liquid enters the main pipe manifold 15 through the sand outlet through the sand conveying device, and then enters the fracturing truck through the main pipe manifold 15 liquid outlet 11.
Example 2:
on the basis of embodiment 1, the present embodiment provides a closed sand mixing device, a fluid infusion manifold 25, a flow meter 19 and a differential pressure valve 18 are sequentially arranged on a fluid inlet 20 of a main manifold 15 along a fluid flowing direction, the fluid infusion manifold 25 is communicated with the middle of a tank body 2, a fluid infusion valve 21 is arranged on the fluid infusion manifold 25, and the flow meter 19 and the fluid infusion manifold 25 are both electrically connected with an electric control cabinet 8.
In this embodiment, the sand conveying device is a sand conveying screw, the sand conveying screw includes a screw shaft and a motor, the screw of the screw shaft is composed of a forward-rotation screw part and a reverse-rotation screw part, an optical axis between the forward-rotation screw part and the reverse-rotation screw part is aligned with the sand outlet, and the motor is electrically connected with the electric control cabinet 8.
The sand conveying screw is driven by a motor, the rotation of the screw shaft enables materials to be conveyed towards the corresponding sand outlet, the stepless speed regulation function can be realized under the condition of low rotating speed and large torque output, and the occupied space of the device is smaller than that of a hydraulic station under the condition of fully ensuring the volume of the device. A liquid supplementing manifold 25 is arranged at the liquid inlet end of the main manifold 15, so that liquid supplementing can be performed while sand is conveyed from inside to outside by the tank body 2; the differential pressure valve 18 can adjust the opening degree, so that a certain pressure difference is generated between the front part and the rear part of the valve, and further a certain friction resistance is generated on the main manifold 15, so that a part of liquid of the main manifold 15 enters the tank body 2 through the liquid supplementing manifold 25, and the purpose of supplementing liquid is achieved. The opening of the liquid supplementing valve 21 is adjusted according to the sand conveying spiral sand conveying amount, so that the liquid supplementing amount and the sand conveying amount are basically balanced, and the stable sand ratio is realized.
Example 3:
on the basis of embodiment 2, this embodiment provides a closed sand mixing device, a nitrogen pressurization manifold 23 is arranged on the upper portion of the tank body 2, a nitrogen pressurization valve 28 is arranged on the nitrogen pressurization manifold 23, a liquid phase discharge manifold 13 is arranged at the bottom of the tank body 2, a liquid phase discharge valve 10 is arranged on the liquid phase discharge manifold 13, and the nitrogen pressurization valve 28 and the liquid phase discharge valve 10 are both electrically connected with the electric control cabinet 8.
Wherein, nitrogen gas pressure boost manifold 23 can realize liquid level control in the work progress, replaces the interior liquid of jar body 2 after the construction is accomplished, discharges liquid totally, prevents jar body 2 internal dry ice.
In this embodiment, the portions of the gas phase discharge manifold 5, the nitrogen pressurization manifold 23, the liquid phase discharge manifold 13, and the liquid supplementing manifold 25, which are communicated with the tank 2, are provided with filtering devices. The solid particles are filtered inside the tank 2.
Example 4:
on the basis of the previous embodiment, the present embodiment provides a closed sand mulling device as shown in fig. 1, in the present embodiment, the sand outlet has a sand outlet 16 and b sand outlet 14, which are symmetrically distributed at the bottom of the tank 2, the sand conveying screw is divided into a sand conveying screw 17 and b sand conveying screw 12, which are symmetrically distributed at the bottom of the tank 2 and driven by a motor 24 and b motor 9, respectively, the outlet of the sand conveying screw 17 and b sand conveying screw 12 is aligned with the sand outlet 16 a and b sand outlet 14, respectively, and the rotation of the sand conveying screw 17 and b sand conveying screw 12 causes the mulling fluid to be conveyed to the sand outlet 16 a and b sand outlet 14, respectively.
The tank body 2 is a movable horizontal pressure tank, a pressure sensor 27 and a temperature sensor 26 are arranged on the tank body 2, a heat insulation layer 4 is arranged outside the tank body 2, and control signals of the pressure sensor 27, the temperature sensor 26, an a motor 24, a b motor 9, a flow meter 19, a gas phase discharge valve 6, a nitrogen pressurization valve 28, a liquid phase discharge valve 10 and a liquid supplementing valve 21 are all connected with an electric control cabinet 8 and are remotely transmitted through signals to realize remote control.
Example 5:
the embodiment provides a closed sand mixing method, and the closed sand mixing device adopting the embodiment comprises the following steps:
step 1), pressurizing: a propping agent is filled in the tank body 2 through the sand filling port 3, a gas phase channel of the tank body 2 is communicated with a liquid storage tank of carbon dioxide or other gases for pressurizing, so that the pressure of the tank body 2 is consistent with the pressure of the liquid storage tank;
step 2) cooling: after the pressure of the tank body 2 is consistent with the pressure of the liquid storage tank, closing the gas phase channel of the tank body 2, opening the liquid phase channel of the tank body 2 to enable carbon dioxide or other gas liquid phase to enter, opening the gas phase discharge valve 6 to exhaust gas, and cooling the tank body 2 and the propping agent;
step 3), liquid filling: keeping the gas-phase discharge valve 6 to exhaust, gradually raising the liquid level after the tank body 2 and the propping agent are cooled, stopping filling liquid when the liquid level is raised to be higher than the sand surface height, and closing the gas-phase discharge valve 6;
step 4), sand mixing: and simultaneously starting a plurality of sand conveying devices, setting the sand conveying speed of the sand conveying devices according to the construction sand ratio, and adjusting the opening degree of a liquid supplementing valve 21 by an electric control cabinet 8 according to the sand conveying speed to ensure that the volume of carbon dioxide or other gas liquid phase entering the tank body 2 through a liquid supplementing manifold 25 is consistent with the volume of the sand mulling liquid of the output tank body 2, and the sand mulling liquid enters the fracturing truck through a liquid outlet 11 of a main manifold 15.
After the fracturing construction is finished, closing valves at two ends of the liquid inlet 20 and the liquid outlet 11, communicating a nitrogen pressurization manifold 23 and a liquid nitrogen pump truck pipeline through a nitrogen pressurization interface 22, opening a nitrogen pressurization valve 28 to control the pressure of the tank body 2 within a safety range, opening a liquid phase discharge valve 10 to a certain opening degree, discharging liquid through a gas phase discharge port 7 and a liquid phase discharge port 7 until the liquid level of the tank body 2 is zero, closing the liquid phase discharge valve 10, closing the nitrogen pressurization valve 28, opening a gas phase discharge valve 6 to discharge gas at a proper opening degree until the pressure of the tank body 2 is zero, and ending the whole process of sand mixing under the closed pressure condition.
The electric control cabinet 8 in the invention is the prior art, and the method and the structure which are not described in detail in the above embodiments belong to the common general knowledge in the industry, and are not described in detail here.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims.
Claims (2)
1. The utility model provides a closed sand mulling device which characterized in that: the sand conveying device comprises a frame (1), a tank body (2) arranged in the frame (1) and a main manifold (15) arranged below the tank body (2), wherein the tank body (2) is a horizontal pressure tank, a gas phase channel is arranged at the top of the tank body (2), a plurality of sand filling ports (3) are arranged at the top of the tank body, a liquid phase channel is arranged at the bottom of the tank body, a plurality of sand outlets are arranged at the bottom of the tank body (2), the sand outlets and the sand conveying devices are in one-to-one correspondence, one end of each sand outlet is communicated with an outlet of each sand conveying device, the other end of each sand outlet is communicated with the main manifold (15), each sand conveying device is connected with an electric control cabinet (8), a gas phase discharge manifold (5) is arranged at the upper part of the tank body (2), and a gas phase discharge valve (6) is arranged on the gas phase discharge manifold (5);
a liquid supplementing manifold (25), a flow meter (19) and a differential pressure valve (18) are sequentially arranged on a liquid inlet (20) of the main manifold (15) along the liquid flowing direction, the liquid supplementing manifold (25) is communicated with the middle of the tank body (2), a liquid supplementing valve (21) is arranged on the liquid supplementing manifold (25), and the flow meter (19) and the liquid supplementing manifold (25) are electrically connected with the electric control cabinet (8);
the tank body (2) is a movable horizontal pressure tank, a pressure sensor (27) and a temperature sensor (26) are arranged on the tank body (2), a heat insulation layer (4) is arranged outside the tank body (2), and the pressure sensor (27) and the temperature sensor (26) are both electrically connected with an electric control cabinet (8);
a nitrogen pressurization manifold (23) is arranged at the upper part of the tank body (2), a nitrogen pressurization valve (28) is arranged on the nitrogen pressurization manifold (23), a liquid phase discharge manifold (13) is arranged at the bottom of the tank body (2), a liquid phase discharge valve (10) is arranged on the liquid phase discharge manifold (13), and the nitrogen pressurization valve (28) and the liquid phase discharge valve (10) are both electrically connected with an electric control cabinet (8);
the parts of the gas phase discharge manifold (5), the nitrogen pressurization manifold (23), the liquid phase discharge manifold (13), the liquid supplementing manifold (25) communicated with the tank body (2) are provided with filtering devices;
the sand conveying device is a sand conveying screw, the sand conveying screw comprises a screw shaft and a motor, the screw of the screw shaft consists of a forward-rotation-direction screw part and a reverse-rotation-direction screw part, an optical axis between the forward-rotation-direction screw part and the reverse-rotation-direction screw part is aligned with the sand outlet, and the motor is electrically connected with the electric control cabinet (8).
2. A closed sand mixing method adopting the closed sand mixing device as claimed in claim 1, which is characterized by comprising the following steps:
step 1), pressurizing: a propping agent is filled in the tank body (2) through the sand filling port (3), a gas phase channel of the tank body (2) is communicated with a liquid storage tank of carbon dioxide or other gases for pressurizing, so that the pressure of the tank body (2) is consistent with the pressure of the liquid storage tank;
step 2) cooling: after the pressure of the tank body (2) is consistent with the pressure of the liquid storage tank, closing a gas phase channel of the tank body (2), opening a liquid phase channel of the tank body (2) to enable carbon dioxide or other gas liquid phases to enter, opening a gas phase discharge valve (6) to exhaust gas, and cooling the tank body (2) and the propping agent;
step 3), liquid filling: keeping the gas-phase discharge valve (6) to exhaust, gradually raising the liquid level after the tank body (2) and the propping agent are cooled, stopping filling liquid when the liquid level is raised to be higher than the sand surface height, and closing the gas-phase discharge valve (6);
step 4), sand mixing: and simultaneously, a plurality of sand conveying devices are started, the sand conveying speed of the sand conveying devices is set according to the construction sand ratio, the opening degree of a liquid supplementing valve (21) is adjusted by an electric control cabinet (8) according to the sand conveying speed, so that the volume of carbon dioxide or other gas liquid phase entering the tank body (2) through a liquid supplementing manifold (25) is consistent with the volume of the sand mulling liquid of the output tank body (2), and the sand mulling liquid enters the fracturing truck through a liquid outlet (11) of a main manifold (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710021365.6A CN106640024B (en) | 2017-01-12 | 2017-01-12 | Closed sand mixing device and method |
Applications Claiming Priority (1)
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| CN113445983B (en) * | 2020-03-24 | 2022-12-16 | 中国石油化工股份有限公司 | Closed sand mixing device and liquid carbon dioxide fracturing method |
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