CN107288608B - A sand mixing device is pressed in area for oil field fracturing - Google Patents
A sand mixing device is pressed in area for oil field fracturing Download PDFInfo
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- CN107288608B CN107288608B CN201710650568.1A CN201710650568A CN107288608B CN 107288608 B CN107288608 B CN 107288608B CN 201710650568 A CN201710650568 A CN 201710650568A CN 107288608 B CN107288608 B CN 107288608B
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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
- 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
Abstract
The invention discloses a pressurized sand mixing device for oilfield fracturing, which is characterized in that a flushing branch of a first liquid adding pipeline flushes propping agents in a sand storage cavity of a sand adding device into an outer tank, carbon dioxide liquid is added into the outer tank by the liquid adding branch, the carbon dioxide liquid in the outer tank flows into an inner tank through a radial hole, the carbon dioxide liquid in the inner tank flows tangentially in the inner tank under the flushing of a second liquid adding pipeline and flows into the outer tank again through the radial hole so as to flush propping agents deposited at the bottom of the outer tank, a stirring device of the outer tank stirs sand carrying liquid which is formed by mixing the carbon dioxide liquid and the propping agents in the outer tank, and the sand carrying agents are discharged from a discharge pipeline at the bottom of the outer tank after being uniformly stirred, so that the mixing effect is good, the bottom of a tank body is not easy to freeze, continuous sand adding operation can be realized, and the efficiency is high; the working state of the mixing tank can be monitored, an alarm can be given out under abnormal conditions, emergency measures are automatically taken, the safety is high, accurate electric control operation can be performed, the use is convenient, and labor is saved.
Description
Technical Field
The invention relates to the technical field of oilfield fracturing, in particular to a sand mixing device with pressure for oilfield fracturing.
Background
The fracturing construction operation is one of the important means for improving the yield and efficiency of the oil and gas well by reforming the oil and gas reservoir. The fracturing can lead the stratum to generate cracks, improve the flowing environment of oil in the underground, increase the yield of the oil well, and play an important role in improving the flowing condition of the bottom of the oil well, slowing down the interlayer and improving the oil layer utilization condition.
The most commonly used hydrocarbon reservoir reforming technology at home and abroad at present is a hydraulic fracturing technology, namely, a water-based fracturing fluid is adopted to reform the hydrocarbon reservoir. However, the water-based fracturing fluid system has the defects of great waste of water resources, clay expansion, damage to oil and gas layers by fracturing fluid residues, underground water pollution caused by incomplete flowback, high sewage treatment cost and the like.
The carbon dioxide anhydrous energy storage fracturing technology is derived from North America, is a technology which adopts liquid carbon dioxide as fracturing fluid to replace water, and is mainly designed for oil gas development of coalbed methane, water-sensitive reservoirs, thicker reservoirs containing crude oil and low-pressure reservoirs. Compared with the conventional hydraulic fracturing, the carbon dioxide anhydrous energy storage fracturing yield increasing effect is remarkable, 5 to 6 times of the hydraulic fracturing effect and 4 times of the nitrogen foam fracturing effect are achieved, additives are hardly needed, and the cost is relatively low; after the liquid carbon dioxide is vaporized, no water phase and no residue exist, and only propping agent is left in the stratum, so that the damage to the reservoir is avoided, and the rapid liquid discharge production can be realized; in addition, the carbon dioxide has stronger adsorption force than methane, and methane adsorbed on the parent rock can be replaced, so that the yield of natural gas or coalbed methane is improved, and the permanent storage of part of carbon dioxide is realized.
At present, the existing domestic carbon dioxide sand mixing device mainly comprises a solid conveying device and a pressure container communicated with the solid conveying device, wherein a propping agent filling port and a solid discharging port are arranged on the pressure container. In the actual use process, the propping agent is filled into the pressure container through an external device three days in advance, then the pressure container is pressurized, and the pressure in the tank body is added to 2.3MPa. After construction is completed, low-temperature carbon dioxide is filled into the equipment, and cooling treatment is carried out on the internal propping agent. And after all the working procedures are finished, the equipment can meet the construction conditions. In the site construction process, external low-temperature liquid is connected to the top of the pressure container, low-temperature C02 is filled from top to bottom, and the propping agent is taken out of the pressure storage tank in the pressurizing mode, so that the carbon dioxide liquid sand-carrying fracturing process is realized.
However, in the actual construction process, the following problems are easily caused: 1. the tank body is easy to freeze in the early-stage low-temperature carbon dioxide liquid filling process, so that the output pipeline at the bottom of the pressure container is blocked, and the whole equipment, even the whole construction team, cannot complete normal construction operation; 2. because the pressure vessel adopts a vehicle-mounted process, the construction preparation period of the equipment is longer, and propping agent cannot be added after the solid filling of the tank body is completed, so that the continuous operation working condition of large-scale construction cannot be met.
Disclosure of Invention
The invention aims to overcome the technical defects, and provides a sand mixing device with pressure for oilfield fracturing, which solves the technical problems in the prior art.
In order to achieve the technical purpose, the technical scheme of the invention provides a sand mixing device with pressure for oilfield fracturing, which comprises the following components: a mixing tank, a plurality of sand adding devices and a controller; the mixing tank comprises a tank body, a first liquid adding pipeline, a second liquid adding pipeline, a discharge pipeline and a stirring device; the sand adding device comprises a driving oil cylinder, a push rod, a sand adding piston, a sealing cylinder sleeve, a sealing packing and an emergency shutoff valve; the bottom of the tank body is provided with a partition plate, the partition plate divides the tank body into an inner tank and an outer tank, the outer tank is a tank body above the partition plate, the inner tank is a tank body below the partition plate, and the partition plate is provided with a plurality of through radial holes; the first liquid adding pipeline comprises a flushing branch and a liquid adding branch, the first liquid adding pipeline and the second liquid adding pipeline are simultaneously connected with a liquid inlet pump, the liquid inlet pump introduces high-pressure carbon dioxide liquid into the tank body from the outside of the tank body through the first liquid adding pipeline and the second liquid adding pipeline, a liquid outlet of the flushing branch is arranged above the sand adding device, a liquid outlet of the liquid adding branch is arranged in an outer tank, and a liquid outlet of the second liquid adding pipeline is arranged at the bottom of the inner tank; the discharge pipeline is connected with a sand discharge pump, the discharge pipeline is arranged at the bottom of the outer tank, and the sand discharge pump discharges the sand-carrying fluid uniformly mixed in the outer tank to the outside of the tank body through the discharge pipeline; the stirring device is arranged at the center of the outer tank and is used for stirring sand-carrying fluid in the outer tank; the sand adding device is arranged on the side wall of the tank body, and the front end of the sand adding device stretches into the tank body; the driving oil cylinder is connected with the push rod, the push rod is connected with the sand adding piston, the sand adding piston is arranged in the sealing cylinder sleeve, and the sealing packing is sleeved on the sand adding piston; the sand storage cavity is internally provided with a sand storage cavity with openings at the upper part and the lower part, propping agent is stored in the sand storage cavity, and the diameter of the radial hole is smaller than the diameter of propping agent particles; the emergency shut-off valve is arranged at the tail end of the sand adding device, and the tail end of the sand adding device is closed after the emergency shut-off valve is closed; the driving oil cylinder drives the push rod to push the sand adding piston to reciprocate along the sealing cylinder sleeve, and a liquid outlet of the flushing branch is used for spraying high-pressure carbon dioxide liquid to flush the propping agent in the sand storage cavity into the outer tank; the controller is electrically connected with the liquid inlet pump, the sand discharge pump, the stirring device, the driving oil cylinder and the emergency shutoff valve.
Compared with the prior art, the invention has the beneficial effects that: the propping agent in the sand storage cavity of the sand adding device is washed into the outer tank by spraying high-pressure carbon dioxide liquid from the liquid outlet of the washing branch of the first liquid adding pipeline, the carbon dioxide liquid is added into the outer tank by the liquid adding branch of the first liquid adding pipeline, the carbon dioxide liquid in the outer tank flows into the inner tank through the radial holes, the carbon dioxide liquid in the inner tank flows tangentially in the inner tank and flows into the outer tank again through the radial holes under the washing of the second liquid adding pipeline so as to wash the propping agent deposited at the bottom of the outer tank, the stirring device of the outer tank stirs the sand carrying liquid in the outer tank, which is formed by mixing the carbon dioxide liquid and the propping agent, and the sand carrying liquid in the outer tank is uniformly stirred and then discharged from the discharge pipeline at the bottom of the outer tank for oilfield fracturing; meanwhile, the controller is electrically connected with the liquid inlet pump, the sand discharge pump, the stirring device, the driving oil cylinder, the emergency shut-off valve, the emergency emptying device, the automatic pressure discharge valve, the pressure detection device, the liquid level detection device and the alarm device, so that the working state of the mixing tank can be monitored, an alarm can be given when an abnormal condition occurs, emergency measures can be automatically taken, and the safety is high; the controller and the devices electrically connected with the controller form an electric control system, so that the pressurized sand mixing device can be accurately and electrically controlled, and is convenient to use and labor-saving.
Drawings
FIG. 1 is a front view of a pressurized sand mixing device for oilfield fracturing provided by the invention;
FIG. 2 is a cross-sectional view of the sanding apparatus of FIG. 1;
fig. 3 is a control diagram of a pressurized sand mixing device for oilfield fracturing.
In the accompanying drawings: 1. mixing tank, 2, sand adding device, 3, controller, 11, tank body, 111, outer tank, 112, inner tank, 113, radial hole, 12, first liquid adding pipeline, 121, flushing branch, 122, liquid adding branch, 123, liquid inlet pump, 13, second liquid adding pipeline, 14, emergency emptying device, 15, discharge pipeline, 151, sand discharging pump, 16, stirring device, 161, driving device, 162, stirring shaft, 163, stirring blade, 17, pressure discharging valve, 171, automatic pressure discharging valve, 172, manual pressure discharging valve, 18, measuring device, 181, pressure detecting device, 182, liquid level detecting device, 19, alarm device, 21, driving oil cylinder, 22, push rod, 23, sand adding piston, 24, sealing cylinder sleeve, 25, sealing packing, 26, emergency shut-off valve, 231, sand storing cavity.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a pressurized sand mixing device for oilfield fracturing, which comprises: a mixing tank 1, a plurality of sand adding devices 2 and a controller 3; the mixing tank 1 comprises a tank body 11, a first liquid adding pipeline 12, a second liquid adding pipeline 13, a discharge pipeline 15, a stirring device 16, an emergency emptying device 14, a pressure discharge valve 17, a measuring device 18 and an alarm device 19; the sand feeding device 2 comprises a driving oil cylinder 21, a push rod 22, a sand feeding piston 23, a sealing cylinder sleeve 24, a sealing packing 25 and an emergency shutoff valve 26; the pressure relief valve 17 includes an automatic pressure relief valve 171 and a manual pressure relief valve 172, and the measuring device 18 includes a pressure detecting device 181 and a liquid level detecting device 182.
In the above technical solution, a compartment plate is arranged at the bottom of the tank 11, the compartment plate divides the tank 11 into an inner tank 112 and an outer tank 111, the outer tank 111 is a tank above the compartment plate, the inner tank 112 is a tank below the compartment plate, and a plurality of through radial holes 113 are arranged on the compartment plate; the first liquid adding pipeline 12 comprises a flushing branch 121 and a liquid adding branch 122, the first liquid adding pipeline 12 and the second liquid adding pipeline 13 are simultaneously connected with a liquid inlet pump 123, the liquid inlet pump 123 introduces high-pressure carbon dioxide liquid into the tank 11 from the outside of the tank 11 through the first liquid adding pipeline 12 and the second liquid adding pipeline 13, a liquid outlet of the flushing branch 121 is arranged above the sand adding devices 2, each sand adding device 2 is matched with one flushing branch 121 for flushing propping agents in a sand storage cavity 231 of the sand adding device 2, a liquid outlet of the liquid adding branch 122 is arranged in an outer tank, the liquid adding branch 122 is used for adding needed carbon dioxide liquid into the outer tank, and most carbon dioxide liquid in the tank comes from the liquid adding branch 122; the liquid outlet of the second liquid adding pipeline 13 is arranged at the bottom of the inner tank 112; the discharge pipeline 15 is connected with a discharge sand pump 151, the discharge pipeline 15 is arranged at the bottom of the outer tank 111, and the discharge sand pump 151 discharges the uniformly mixed sand-carrying fluid in the outer tank 111 to the outside of the tank 11 through the discharge pipeline 15; the stirring device 16 is arranged at the center of the outer tank 111, and the stirring device 16 stirs sand-carrying fluid in the outer tank 111; the emergency draining device 14 is arranged at the bottom of the inner tank 112, sand-carrying fluid in the tank 11 is drained after the emergency draining device 14 is opened, the automatic draining valve 171 and the manual draining valve 172 are arranged on the tank 11, the pressure detecting device 181 is arranged on the tank 11 and measures the pressure inside the tank 11, the liquid level detecting device 182 is inserted into the tank 11 and measures the liquid level inside the tank 11, and the alarm device 19 is arranged on the tank 11.
In the technical scheme, the sand adding device 2 is arranged on the side wall of the tank 11, and the front end of the sand adding device 2 extends into the tank 11; the driving oil cylinder 21 is connected with the push rod 22, the push rod 22 is connected with the sand adding piston 23, the sand adding piston 23 is arranged in the sealing cylinder sleeve 24, the sealing packing 25 is sleeved on the sand adding piston 23, and the sealing packing 25 is used for sealing between the sand adding piston 23 and the sealing cylinder sleeve 24; the sand adding piston 23 is internally provided with a sand storage cavity 231 with upper and lower openings, the upper opening of the sand storage cavity 231 is a sand inlet, the lower opening of the sand storage cavity 231 is a sand outlet, the sand inlet and the sand outlet of the sand storage cavity 231 are staggered, propping agents are stored in the sand storage cavity 231, and preferably, the propping agents are ceramic sand; the emergency shut-off valve 26 is arranged at the tail end of the sand adding device 2, and after the low-temperature carbon dioxide leakage of the mixing tank 1 occurs, the emergency shut-off valve 26 is closed, so that the tail end of the sand adding device 2 is closed, and the further leakage is prevented.
In the above technical solution, the driving cylinder 21 drives the push rod 22 to push the sand adding piston 23 to reciprocate along the sealing cylinder sleeve 24, and when the sand adding piston 23 moves out of the tank 11, the sand inlet of the sand storage cavity 231 of the sand adding piston 23 is separated from the range of the sealing cylinder sleeve 24, the propping agent is added into the sand inlet of the sand storage cavity 231, so as to realize material filling; when the sand adding piston 23 moves into the tank 11, the sand storage cavity 231 of the sand adding piston 23 is separated from the range of the sealing cylinder sleeve 24 and is positioned below the liquid outlet of the flushing branch 121, the liquid outlet of the flushing branch 121 sprays high-pressure carbon dioxide liquid to flush the propping agent in the sand storage cavity 231 into the outer tank 111, so that the propping agent is added into the tank 11; when the driving oil cylinder 21 does not work, the sand adding piston 23 is positioned in the middle of the sealing cylinder sleeve 24, and the sand inlet and the sand outlet of the sand storage cavity 231 are both closed by the sealing cylinder sleeve 24; when the mixing tank 1 leaks low-temperature carbon dioxide, for example, the sealing packing 25 is damaged and then carbon dioxide leaks, at this time, the driving oil cylinder 21 pushes the push rod 22 forward, the sand adding piston 23 moves towards the inside of the tank 11, and the emergency shutoff valve 26 is closed, so that the tail end of the sand adding device 2 is closed, and further leakage is prevented.
In the above technical scheme, preferably, 4 sand adding devices 2 are installed on the side wall of the tank 11, and the continuous sand adding working condition requirement of the sand mixing device with pressure is realized by adjusting the movement gap of the driving oil cylinder 21 of each sand adding device 2.
In the above technical solution, the controller 3 is electrically connected with the liquid inlet pump 123, the sand discharge pump 151, the stirring device 16, the driving oil cylinder 21, the emergency shut-off valve 26, the emergency evacuation device 14, the automatic pressure discharge valve 171, the pressure detection device 181, the liquid level detection device 182, and the alarm device 19; the controller 3 controls the on/off, the displacement and the conveying speed of the liquid inlet pump 123 and the sand discharge pump 151, the controller 3 controls the on/off and the rotating speed of the stirring device 16, the controller 3 controls the on/off and the running speed of the driving oil cylinder 21, and the controller 3 controls the emergency shutoff valve 26 and the switch of the emergency evacuation device 14; the controller 3 controls the opening degree of the automatic pressure discharge valve 171, and the tank 11 can be discharged after the automatic pressure discharge valve 171 is opened; the liquid level detection device 182 measures the liquid level in the tank 11 and sends liquid level information to the controller 3, the pressure detection device 181 measures the pressure in the tank 11 and sends pressure measurement information to the controller 3, and when the pressure measurement information and the liquid level information are abnormal, the controller 3 controls the alarm to give an alarm; the controller 3 controls the liquid inlet pump 123, the sand discharge pump 151, the stirring device 16, the driving cylinder 21, the emergency shut-off valve 26, the emergency evacuation device 14, and the automatic pressure discharge valve 171 according to the pressure measurement information and the liquid level information.
In the above-mentioned technical solution, the automatic pressure relief valve 171 includes a mechanical pressure relief valve, and when the pressure borne by the automatic pressure relief valve 171 reaches a certain value, the mechanical pressure relief valve is automatically opened to perform pressure relief.
In the above technical solution, the stirring device 16 includes a driving device 161, a stirring shaft 162, and a plurality of stirring blades 163, where the driving device 161 is connected to the stirring shaft 162 and drives the stirring shaft 162 to rotate, and the stirring blades 163 are disposed on the stirring shaft 162; preferably, the drive means 161 is a hydraulic motor or an electric machine. The stirring device 16 continuously stirs the sand-carrying fluid of the outer tank 111 into a homogeneous mixed fluid, reduces the generation of gas, increases the mobility of the sand-carrying fluid, and prevents the bottom of the tank 11 from freezing.
In the above technical scheme, the tank 11 of the mixing tank 1 is designed in a pressure vessel manner, so that the operation of equipment under pressure can be met, and the low-temperature working condition requirement can be met, specifically, the normal working pressure of the tank 11 is 3.0MPa, the diameter of the tank 11 is 1800mm, and the height is 2200mm. The working pressure and the size of the tank 11 can be flexibly adjusted according to the service requirements. The tank body 11 of the mixing tank 1 adopts a tank-in-tank sleeve structure, an outer tank 111 and an inner tank 112 are arranged, a high-pressure carbon dioxide liquid is sprayed out of a liquid outlet of a flushing branch 121 to flush propping agent in a sand storage cavity 231 of the sand adding device 2 into the outer tank 111, the carbon dioxide liquid is added into the outer tank by a liquid adding branch 122, the carbon dioxide liquid in the outer tank flows into the inner tank through radial holes (the radial holes are sized to not allow the propping agent to pass through), the carbon dioxide liquid in the inner tank flows tangentially in the inner tank under the flushing of a second liquid adding pipeline and flows into the outer tank again through the radial holes so as to flush propping agent deposited at the bottom of the outer tank, a stirring device of the outer tank stirs sand carrying liquid formed by mixing the carbon dioxide liquid and the propping agent in the outer tank, and the sand carrying liquid in the outer tank is uniformly stirred and then discharged from a discharge pipeline 15 at the bottom of the outer tank, and the structural design of the mixing tank 1 enables the pressurized sand mixing device to completely and continuously mix the carbon dioxide liquid and the propping agent under the condition of large sand carrying liquid ratio, so that the diameter of the mixing tank 1 is not easy to generate, the mixing effect is not good, and the bubble mixing effect is also can be accumulated uniformly and the bubble mixing effect is small.
Compared with the prior art, the invention has the beneficial effects that: the propping agent in the sand storage cavity of the sand adding device is washed into the outer tank by spraying high-pressure carbon dioxide liquid from the liquid outlet of the washing branch of the first liquid adding pipeline, the carbon dioxide liquid is added into the outer tank by the liquid adding branch of the first liquid adding pipeline, the carbon dioxide liquid in the outer tank flows into the inner tank through the radial holes, the carbon dioxide liquid in the inner tank flows tangentially in the inner tank and flows into the outer tank again through the radial holes under the washing of the second liquid adding pipeline so as to wash the propping agent deposited at the bottom of the outer tank, the stirring device of the outer tank stirs the sand carrying liquid in the outer tank, which is formed by mixing the carbon dioxide liquid and the propping agent, and the sand carrying liquid in the outer tank is uniformly stirred and then discharged from the discharge pipeline at the bottom of the outer tank for oilfield fracturing; meanwhile, the controller is electrically connected with the liquid inlet pump, the sand discharge pump, the stirring device, the driving oil cylinder, the emergency shut-off valve, the emergency emptying device, the automatic pressure discharge valve, the pressure detection device, the liquid level detection device and the alarm device, so that the working state of the mixing tank can be monitored, an alarm can be given when an abnormal condition occurs, emergency measures can be automatically taken, and the safety is high; the controller and the devices electrically connected with the controller form an electric control system, so that the pressurized sand mixing device can be accurately and electrically controlled, the use is convenient, and the labor is saved; the sand-carrying fluid mixed by the carbon dioxide and the propping agent is used for carrying out oilfield fracturing, the fracturing effect is good, additives are hardly needed, the cost is relatively low, liquid carbon dioxide is free of water phase and residues after being gasified, only the propping agent is left in the stratum, the damage to the reservoir is avoided, and the rapid liquid drainage and production can be realized.
The above-described embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (5)
1. A pressurized sand mixing device for oilfield fracturing, comprising: a mixing tank, a plurality of sand adding devices and a controller; the mixing tank comprises a tank body, a first liquid adding pipeline, a second liquid adding pipeline, a discharge pipeline and a stirring device; the sand adding device comprises a driving oil cylinder, a push rod, a sand adding piston, a sealing cylinder sleeve, a sealing packing and an emergency shutoff valve; the bottom of the tank body is provided with a partition plate, the partition plate divides the tank body into an inner tank and an outer tank, the outer tank is a tank body above the partition plate, the inner tank is a tank body below the partition plate, and the partition plate is provided with a plurality of through radial holes; the first liquid adding pipeline comprises a flushing branch and a liquid adding branch, the first liquid adding pipeline and the second liquid adding pipeline are simultaneously connected with a liquid inlet pump, the liquid inlet pump introduces high-pressure carbon dioxide liquid into the tank body from the outside of the tank body through the first liquid adding pipeline and the second liquid adding pipeline, a liquid outlet of the flushing branch is arranged above the sand adding device, a liquid outlet of the liquid adding branch is arranged in an outer tank, and a liquid outlet of the second liquid adding pipeline is arranged at the bottom of the inner tank; the discharge pipeline is connected with a sand discharge pump, the discharge pipeline is arranged at the bottom of the outer tank, and the sand discharge pump discharges the sand-carrying fluid uniformly mixed in the outer tank to the outside of the tank body through the discharge pipeline; the stirring device is arranged at the center of the outer tank and is used for stirring sand-carrying fluid in the outer tank; the sand adding device is arranged on the side wall of the tank body, and the front end of the sand adding device stretches into the tank body; the driving oil cylinder is connected with the push rod, the push rod is connected with the sand adding piston, the sand adding piston is arranged in the sealing cylinder sleeve, and the sealing packing is sleeved on the sand adding piston; the sand storage cavity is internally provided with a sand storage cavity with openings at the upper part and the lower part, propping agent is stored in the sand storage cavity, and the diameter of the radial hole is smaller than the diameter of propping agent particles; the emergency shut-off valve is arranged at the tail end of the sand adding device, and the tail end of the sand adding device is closed after the emergency shut-off valve is closed; the driving oil cylinder drives the push rod to push the sand adding piston to reciprocate along the sealing cylinder sleeve, and a liquid outlet of the flushing branch is used for spraying high-pressure carbon dioxide liquid to flush the propping agent in the sand storage cavity into the outer tank; the controller is electrically connected with the liquid inlet pump, the sand discharge pump, the stirring device, the driving oil cylinder and the emergency shutoff valve, and 4 sand adding devices are arranged on the side wall of the tank body.
2. The pressurized sand mixing device for oilfield fracturing of claim 1, wherein the mixing tank further comprises an emergency evacuation device, an automatic pressure relief valve, a manual pressure relief valve, a pressure detection device, a liquid level detection device, an alarm device; the emergency emptying device is arranged at the bottom of the inner tank, the sand-carrying fluid in the tank body is emptied after the emergency emptying device is started, the automatic pressure discharging valve and the manual pressure discharging valve are arranged on the tank body, the pressure detecting device is arranged on the tank body and measures the pressure in the tank body, the liquid level detecting device is inserted into the tank body and measures the liquid level in the tank body, and the alarm device is arranged on the tank body.
3. The pressurized sand mixing device for oilfield fracturing of claim 2, wherein the controller is further electrically connected to the emergency evacuation device, the automatic pressure relief valve, the pressure detection device, the liquid level detection device, the alarm device.
4. The pressurized sand mixing device for oilfield fracturing of claim 1, wherein the stirring device comprises a driving device, a stirring shaft and a plurality of stirring blades, the driving device is connected with the stirring shaft and drives the stirring shaft to rotate, and the stirring blades are arranged on the stirring shaft.
5. The pressurized sand mixing device for oilfield fracturing of claim 4, wherein the drive is a hydraulic motor or an electric machine.
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| CN107882542A (en) * | 2017-11-30 | 2018-04-06 | 北京百利时能源技术股份有限公司 | The closed of dry method pressure break continuously adds sand blending tank |
| CN108590621B (en) * | 2018-04-16 | 2020-04-24 | 中煤科工集团西安研究院有限公司 | System and method for high-pressure sand adding after hydraulic fracturing remote continuous pump in coal mine |
| CN109490038A (en) * | 2018-12-05 | 2019-03-19 | 中国石油集团川庆钻探工程有限公司工程技术研究院 | A kind of liquid CO2Mixture and viscosity measurements integrated apparatus and method |
| CN112901132A (en) * | 2019-11-19 | 2021-06-04 | 中国石油天然气股份有限公司 | Carbon dioxide anhydrous fracturing system and method |
| 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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| US20020189808A1 (en) * | 2001-06-13 | 2002-12-19 | Nguyen Philip D. | Methods and apparatus for gravel packing or frac packing wells |
| CA2508953A1 (en) * | 2005-06-01 | 2006-12-01 | Frac Source Inc. | High-pressure injection proppant system |
| CN102852508B (en) * | 2012-08-23 | 2015-03-04 | 陕西延长石油(集团)有限责任公司研究院 | Liquid CO2 fracturing technology for shale gas well |
| CN102979495B (en) * | 2012-12-28 | 2016-06-29 | 中国石油集团渤海钻探工程有限公司 | Many bunches of Limited entry fracturing tubing strings of open-hole horizontal well and fracturing process thereof |
| CN105089554B (en) * | 2014-05-14 | 2018-01-02 | 中国石油天然气股份有限公司 | Oilfield horizontal well drag fracturing transformation service valve with pressure and anti-flushing well releasing method |
| CN104712304B (en) * | 2015-01-29 | 2017-11-17 | 中石化石油工程技术服务有限公司 | A kind of pulsed sand fracturing system and its control method |
| CN207004502U (en) * | 2017-08-02 | 2018-02-13 | 湖北中油科昊机械制造有限公司 | A kind of mixing device with pressure for oil field compression fracture |
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