CN112727425B - Carbon dioxide thickening and sand adding integrated method and device - Google Patents
Carbon dioxide thickening and sand adding integrated method and device Download PDFInfo
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- CN112727425B CN112727425B CN202110099202.6A CN202110099202A CN112727425B CN 112727425 B CN112727425 B CN 112727425B CN 202110099202 A CN202110099202 A CN 202110099202A CN 112727425 B CN112727425 B CN 112727425B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 343
- 239000004576 sand Substances 0.000 title claims abstract description 232
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 171
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 171
- 238000000034 method Methods 0.000 title claims abstract description 54
- 230000008719 thickening Effects 0.000 title claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 138
- 238000003756 stirring Methods 0.000 claims abstract description 73
- 238000002156 mixing Methods 0.000 claims abstract description 58
- 239000012530 fluid Substances 0.000 claims abstract description 37
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 239000007787 solid Substances 0.000 claims abstract description 22
- 238000005086 pumping Methods 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 4
- 230000010354 integration Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 20
- 238000010276 construction Methods 0.000 abstract description 14
- 230000000903 blocking effect Effects 0.000 abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 179
- 239000006004 Quartz sand Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/82—Combinations of dissimilar mixers
- B01F33/821—Combinations of dissimilar mixers with consecutive receptacles
-
- 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
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- 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)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
Abstract
The invention relates to a carbon dioxide thickening and sand adding integrated method and device. The carbon dioxide thickening and sand adding integrated method comprises the following steps: adding sand by the sand adder, refrigerating the sand-carrying fluid by the cooler, mixing the sand-carrying fluid and the propping agent in the sand mixing stirring tank, conveying the high-concentration sand fluid to the stirring tank by the piston type solid pump, pumping liquid carbon dioxide by the booster pump, entering the carbon dioxide stirring tank by the circulating injector, and controlling the mixed sand fluid to enter the fracturing truck by the rotary valve. The carbon dioxide thickening and sand adding integrated method and device solve the problems of low viscosity of carbon dioxide, difficult sand carrying and low sand ratio, reduce the sand blocking risk in the carbon dioxide sand adding process, and realize the stable sand adding with high sand ratio in the carbon dioxide fracturing construction.
Description
Technical Field
The invention belongs to the field of oil gas development, and particularly relates to a method for realizing thickening and continuous sand adding of liquid carbon dioxide in a carbon dioxide sand adding fracturing transformation process.
Background
The carbon dioxide fracturing technology is a continuously perfected fracturing technology, and compared with the traditional fracturing technology taking water-based fracturing fluid as the main material, the carbon dioxide fracturing has the characteristics of small reservoir pollution, high reconstruction strength, long effect period and the like, and particularly has a good application effect on reservoirs which are difficult to reconstruct in an unconventional way such as high-water-content or water-locked reservoirs, clay minerals which are easy to move or expand, low permeability and the like and reservoirs which are difficult to flowback by the fracturing fluid. Since the first application in north america in the 80 s of the 20 th century, the method has been widely applied to the reformation of various types of hydrocarbon reservoirs such as low-permeability, tight sandstone, shale hydrocarbon and the like. Along with the continuous increase of the development force of unconventional oil and gas resources in China, the carbon dioxide fracturing technology is gradually popularized and applied in various large oil fields in China. However, the existing domestic CO 2 fracturing equipment has obvious gap compared with the international advanced level, and particularly has obvious defects in the aspect of adding sand into CO 2. On one hand, the viscosity of CO 2 is low, the sand suspension performance is poor, the construction sand ratio is low, and on the other hand, the equipment and the process for pumping low-temperature sand-carrying fluid are not mature enough, so that higher requirements are provided for the thickening performance of carbon dioxide and the low-temperature sand conveying capability.
CO 2 fracturing needs to be pre-cooled on propping agents in the sand mixing vehicle, the propping agents contain water, and the propping agents can freeze at low temperature to cause caking of the propping agents, so that the difficulty of stable sand conveying is increased, and even the risk of sand blockage is caused. Early domestic and foreign carbon dioxide sand adding mainly uses a pressurized container to be filled with liquid carbon dioxide and propping agent in advance, and then uses an independent screw system for conveying. Before entering the high-pressure pump truck, the propping agent and the liquid carbon dioxide fracturing fluid are mixed by utilizing a closed sand mixing device, the propping agent and the liquid carbon dioxide in the pressurized container are precooled, and then are conveyed through an independent spiral system. The traditional sand mixing equipment mostly uses a horizontal or vertical sand mixing tank, so that the rotation speed of a stirring shaft is low, the stirring shaft is short, dead angles exist in stirring, mechanical parts are easy to wear, and the maintenance cost is high; moreover, pressurized vessels have a limited volume, containing up to 25 tons of liquid carbon dioxide, and require a long time to load with proppants. In addition, the liquid CO 2 has low viscosity and poor sand carrying performance, so that the problem of easy sand setting exists.
The lag of the CO 2 thickening and sand adding process severely restricts the wide application of CO 2 fracturing in domestic oil fields. In the process of adding sand into carbon dioxide, under the influence of temperature and pressure and the influence of phase change, CO 2 is thickened and carried with sand to enter a high-pressure pump truck, and then the difficulty of pumping to a target stratum is great, so that a process capable of integrally realizing thickening and sand adding is needed to be designed, the sand adding with high sand ratio in carbon dioxide fracturing is ensured, the reservoir transformation effect is improved, and the efficient development of low-permeability oil gas is realized.
Disclosure of Invention
The invention mainly aims to provide a carbon dioxide thickening and sand adding integrated method and device, which solve the problems of low carbon dioxide viscosity, difficult sand carrying and low sand ratio, reduce the sand blocking risk in the carbon dioxide sand adding process and realize the stable sand adding with high sand ratio in the carbon dioxide fracturing construction.
According to the carbon dioxide thickening and sand adding integrated method, firstly, a liquid cooler is used for controlling the precooling temperature to cool sand-carrying liquid and then pumping the cooled sand-carrying liquid to a sand mixing stirring tank, meanwhile, propping agent also enters the sand mixing stirring tank through a sand adding device, and the sand-carrying liquid and propping agent are mixed in the sand mixing stirring tank; and then pumping the sand-liquid mixed liquid to a carbon dioxide and sand-liquid stirring tank through a solid piston pump, simultaneously pumping liquid carbon dioxide to the carbon dioxide and sand-liquid stirring tank by utilizing a carbon dioxide booster pump, fully mixing the liquid carbon dioxide and the sand liquid by utilizing a circulating injector and a rotary valve, and finally pumping the mixed liquid into a shaft by utilizing a booster pump truck.
The invention discloses a carbon dioxide thickening and sand adding integrated method, wherein the sand-carrying liquid is special for carbon dioxide, the pre-cooling temperature of the sand-carrying liquid is controlled to be minus 35 ℃ through liquid refrigeration equipment, and the using amount of the sand-carrying liquid is 2% or less than 2% of the volume of liquid carbon dioxide.
According to the carbon dioxide thickening and sand adding integrated method, the air seal device is arranged below the sand adding device, high-pressure rotary discharging is carried out by using the air seal device, and propping agent and sand-carrying fluid enter the sand mixing stirring tank at an input rate of 1:1.
The invention discloses a carbon dioxide thickening and sand adding integrated method, wherein a hydraulic valve type piston pump is adopted as a solid piston pump.
The invention relates to a carbon dioxide thickening and sand adding integrated method, wherein a rotary valve is arranged at an outlet of a carbon dioxide and sand liquid stirring tank, and the maximum sand output of the carbon dioxide and sand liquid stirring tank is 12 cubic meters per minute.
The carbon dioxide thickening and sand adding integrated method has the beneficial effects that: by adopting two mixing processes of mixing sand-carrying liquid and propping agent and mixing liquid carbon dioxide and sand liquid, carbon dioxide thickening and continuous sand adding integration can be realized, high-sand-ratio sand carrying is realized by utilizing high-performance sand-carrying liquid, liquid carbon dioxide and sand liquid are fully mixed through multistage mixing, pressure fluctuation in the construction process caused by uneven sand mixing is avoided, sand concentration can be effectively controlled according to construction requirements, continuous sand adding requirement in carbon dioxide fracturing construction is finally realized, and the success rate of operation and post-pressing yield increasing effect are ensured.
The invention discloses a device for a carbon dioxide thickening and sand adding integrated method, which comprises a liquid cooler, a sand adding device, a sand mixing stirring tank, a solid piston pump, a carbon dioxide booster pump, a rotary valve, a carbon dioxide and sand liquid stirring tank and an emptying valve, wherein an outlet of the liquid cooler is connected with an inlet of the sand mixing stirring tank through a pipeline, an outlet of the sand adding device is connected with an inlet of the sand mixing stirring tank, an outlet of the sand mixing stirring tank is connected with an inlet of the solid piston pump, an outlet of the solid piston pump is connected with an inlet of the carbon dioxide and sand liquid stirring tank, an outlet of the carbon dioxide booster pump is connected with an inlet of the sand liquid stirring tank, the rotary valve is arranged at an outlet of the bottom end of the carbon dioxide and sand liquid stirring tank, an outlet of the carbon dioxide booster pump is connected with an inlet of a shaft, a gas discharge port is arranged at the top end of the carbon dioxide and sand liquid stirring tank, and the emptying valve is arranged at the gas discharge port.
The invention relates to a device for a carbon dioxide thickening and sand adding integrated method, which also comprises an air shutter, wherein the air shutter is arranged at an outlet below the sand adding device.
The device adopted by the carbon dioxide thickening and sand adding integrated method disclosed by the invention further comprises a circulating ejector, wherein the circulating ejector is positioned in the carbon dioxide and sand liquid stirring tank, and the inlet of the circulating ejector is connected with the outlet I of the carbon dioxide booster pump.
The carbon dioxide thickening and sand adding integrated method has the beneficial effects that: in the device adopted by the carbon dioxide thickening and sand adding integrated method, the sand adding device, the air seal device and the sand mixing stirring tank are used as a whole to realize the full mixing of sand carrying fluid and propping agent, and the circulating ejector, the rotary valve, the carbon dioxide and sand fluid stirring tank and the emptying valve are used as a whole to fully mix liquid carbon dioxide and sand fluid mixed fluid, so that the sand blocking risk in the carbon dioxide sand adding process is reduced, and the stable sand adding with high sand ratio in the carbon dioxide fracturing construction is realized.
The invention is further described below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of the overall flow of the integrated method for thickening and adding sand by carbon dioxide, and is also a schematic diagram of the device used in the integrated method for thickening and adding sand by carbon dioxide.
Detailed Description
The invention relates to a carbon dioxide thickening and sand adding integrated method, which is a process method capable of realizing liquid carbon dioxide thickening and high sand ratio continuous sand adding in the carbon dioxide sand adding fracturing modification process, and mainly comprises six steps: the sand adding device adds sand, the cooler refrigerates sand-carrying liquid, the sand-carrying liquid and propping agent are mixed in the sand mixing stirring tank, the piston type solid pump transmits high-concentration sand liquid to the stirring tank, the booster pump pumps liquid carbon dioxide and then enters the carbon dioxide stirring tank through the circulating jet device, the mixed sand liquid is controlled by the rotary valve to enter the fracturing truck for carrying out carbon dioxide sand adding fracturing operation, as shown in fig. 1, the carbon dioxide thickening and sand adding integrated method specifically comprises the following steps:
step 1: the ceramsite or quartz sand enters a sand mixing and stirring tank 4 through a sand inlet auger of a sand adder 2 and a wind seal 3;
According to the actual condition of the stratum pressure and the supporting strength of the propping agent, selecting 30-50 meshes or less of ceramsite or quartz sand, drying, loading the propping agent from a sand adding port, loading the propping agent by using a screw rotary drive, controlling the sand adding speed by using the screw rotary speed, connecting a screw rotary drum with a wind seal device 3, avoiding unstable sand adding caused by escape of gas phase components in the process, and realizing stable sand adding into a sand mixing stirring tank.
The ceramic grains or the quartz sand adopts propping agents with medium-low density and 30-50 meshes and smaller particle sizes, which is beneficial to carrying sand with sand-carrying liquid efficiently.
Step 2: the sand-carrying fluid is cooled by the liquid cooler 1 and then pumped to the sand mixing and stirring tank 4;
The method comprises the steps of selecting special sand-carrying fluid for carbon dioxide, firstly controlling the sand-carrying fluid (thickening agent) to a precooling temperature (-35 ℃) through a liquid cooler, wherein the using amount of the sand-carrying fluid is 2% or less than 2% of the volume of liquid carbon dioxide, specifically determining according to the sand adding requirement, the proportion of the sand-carrying fluid to a propping agent is not less than 1:1, and conveying the cooled sand-carrying fluid to a sand mixing stirring tank.
The special refrigeration equipment (liquid cooler 1) is adopted for cooling the sand-carrying fluid, so that the sand-carrying fluid has flowability in a relatively stable low-temperature state, has good low-temperature sand-carrying performance, and is easy to mix with liquid carbon dioxide.
Step 3: the ceramsite or quartz sand and sand-carrying fluid are fully mixed in a sand mixing and stirring tank 4;
Controlling the sand feeding speed of the sand mixing stirring tank 4 and the conveying speed of the sand-carrying fluid after cooling, ensuring that the propping agent and the sand-carrying fluid enter the sand mixing stirring tank at an input speed of 1:1 or an input speed of a set proportion, and enabling the propping agent and the sand-carrying fluid to be primarily mixed in the sand mixing tank.
Step 4: the sand liquid is pumped to a carbon dioxide and sand liquid stirring tank 9 by a piston solid pump 5;
And after mixing, the sand liquid is conveyed by a hydraulic valve type solid piston pump, so that the sand liquid is continuously and stably pumped into the liquid carbon dioxide and sand liquid stirring tank 9 for secondary mixing. The solid piston pump 5 has a design of a hydraulic control valve body, and can realize continuous and stable pumping of sand liquid to the carbon dioxide and sand liquid stirring tank 9.
Step 5: liquid carbon dioxide flows through the circulating injector 7 from the carbon dioxide booster pump 6 to enter the carbon dioxide and sand liquid stirring tank 9;
The liquid carbon dioxide flows through the circulation injector 7 from the carbon dioxide booster pump 6, the pressure change of the carbon dioxide from the liquid carbon dioxide storage tank to the booster pump is controlled to be 2.0-2.4MPa, the whole process temperature is basically equal to the temperature in the tank (namely, the temperature is kept at-18 ℃), so that the whole process is liquid, if the existing gasified carbon dioxide is emptied by the separation tank of the carbon dioxide booster pump 6, the liquid level of the separation tank is closely monitored, the liquid level of the separation tank is ensured to be not lower than 2/3, the tank pressure is not lower than 1.2MPa, and the situation that the air-moving pump/load change is severe is avoided. The pressurized liquid carbon dioxide enters the carbon dioxide and sand liquid stirring tank 9 through the circulating injector 7, so that the stability of pumping carbon dioxide is ensured.
Step 6: the liquid carbon dioxide and the sand liquid are fully mixed, and then the lower outlet of the carbon dioxide and sand liquid stirring tank 9 is connected with the inlet of the shaft, and the mixture is supplied to the fracturing truck through the main pipeline.
The pumping speed of the liquid carbon dioxide and the pumping speed of the sand liquid are controlled, the liquid carbon dioxide pressurized by the booster pump enters the carbon dioxide and sand liquid stirring tank 9 through the circulating injector 7 and is mixed with the sand liquid, the circulating injector 7 generates liquid carbon dioxide vortex, the sand liquid load can be regulated, the liquid carbon dioxide and the sand liquid are uniformly mixed, and the abrasion between the rotating part and the sand liquid can be eliminated. The rotary valve and the pressure control system are arranged in the stirring tank, the unbalance pressure in the stirring tank is regulated, the sand production concentration is controlled according to the construction requirement, and the construction pressure is ensured to be stable. The stirring tank is reserved with the emptying valve to prevent gasification in the process, a visual observation port is utilized to timely detect the mixing condition of sand liquid in the stirring tank, and finally, fully mixed liquid carbon dioxide and sand liquid are supplied to the fracturing truck from the bottom end outlet of the stirring tank through the main pipeline, so that the discharge capacity and the pressure are strictly controlled in the construction process, and overpressure is avoided.
The rotary valve 8 is arranged at the outlet of the carbon dioxide and sand liquid stirring tank 9, so that the maximum sand output of the carbon dioxide and sand liquid stirring tank 9 is 12 cubic meters per minute.
According to the carbon dioxide thickening and sand adding integrated method, two mixing processes of mixing sand-carrying liquid and propping agent and mixing liquid carbon dioxide and sand liquid are adopted, carbon dioxide thickening and continuous sand adding are integrated, high-sand-ratio sand carrying is achieved by utilizing high-performance sand-carrying liquid, liquid carbon dioxide and sand liquid are fully mixed through multistage mixing, pressure fluctuation in a construction process caused by uneven sand mixing is avoided, sand concentration can be effectively controlled according to construction requirements, continuous sand adding requirements in carbon dioxide fracturing construction are finally achieved, and operation success rate and post-pressure yield increasing effect are guaranteed.
As shown in fig. 1, the device adopted by the carbon dioxide thickening and sand adding integrated method comprises a liquid cooler 1, a sand adding device 2, an air closing device 3, a sand mixing stirring tank 4, a piston solid pump 5, a booster pump 6, a circulating ejector 7, a rotary valve 8, a carbon dioxide and sand liquid stirring tank 9 and a blow-down valve 10, wherein the inlet of the liquid cooler 1 is a sand liquid inlet, the outlet of the liquid cooler 1 is connected with the inlet of the sand mixing stirring tank 4 through a pipeline, the air closing device 3 is arranged at the outlet below the sand adding device 2, the sand adding device 2 and the air closing device 3 are arranged on the sand mixing stirring tank 4 together, or the outlet of the sand adding device 2 is connected with the inlet of the sand mixing stirring tank 4, the outlet of the sand mixing stirring tank 4 is connected with the inlet of the solid piston pump 5, the outlet of the solid piston pump 5 is connected with the inlet of the carbon dioxide and the sand liquid stirring tank 9, the inlet of the circulating ejector 7 is positioned in the carbon dioxide and sand liquid stirring tank 9, the outlet of the carbon dioxide booster pump 6 is connected with the outlet of the carbon dioxide storage tank, the outlet of the booster pump 6 passes through the carbon dioxide and the inlet of the sand liquid stirring tank 9 and is connected with the carbon dioxide gas outlet of the carbon dioxide ejector 7 and the carbon dioxide gas outlet of the carbon dioxide ejector 6 at the bottom end of the sand mixing tank 9, the air discharging valve is arranged at the bottom end of the carbon dioxide gas outlet of the carbon dioxide ejector 6, and the air outlet of the air pump is connected with the carbon dioxide gas outlet of the sand stirring tank 6 at the carbon dioxide outlet is arranged at the bottom end of the carbon dioxide outlet of the sand mixing tank.
As shown in fig. 1, a liquid cooler 1 provides cooling sand-carrying fluid, an air seal device 3 is arranged below a sand adder 2, high-pressure rotary discharging is performed by the air seal device 3, propping agent (ceramsite or quartz sand) and sand-carrying fluid enter a sand mixing stirring tank 4, the cooling sand-carrying fluid and propping agent are mixed in the sand mixing stirring tank 4, then a solid piston pump 5 pumps the mixture into a carbon dioxide and sand mixing tank 9, a carbon dioxide booster pump 6 pumps liquid carbon dioxide into the carbon dioxide and sand mixing tank 9 through a carbon dioxide booster pump outlet I and mixes the mixture with the sand in the tank, and then the mixed liquid carbon dioxide and sand mixing fluid is pumped into a shaft through a carbon dioxide booster pump outlet II by the carbon dioxide booster pump 6. Wherein the sand adder 2 and the air closer 3 are arranged on the sand mixing and stirring tank 4 together as a whole to fully mix sand-carrying fluid and propping agent; the circulation injector 7, the rotary valve 8, the cold sand stirring tank 9 and the blow valve 10 are used for fully mixing the liquid carbon dioxide and the sand liquid mixed solution as a whole.
The device adopted by the carbon dioxide thickening and sand adding integrated method reduces the sand blocking risk in the carbon dioxide sand adding process, and realizes the stable sand adding with high sand ratio in the carbon dioxide fracturing construction.
The above examples are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (5)
1. A carbon dioxide thickening and sand adding integrated method is characterized in that: firstly, controlling the precooling temperature by adopting a liquid cooler to cool sand-carrying fluid, then pumping the cooled sand-carrying fluid to a sand mixing stirring tank, and simultaneously, enabling propping agent to enter the sand mixing stirring tank through a sand adder to mix the sand-carrying fluid and propping agent in the sand mixing stirring tank; pumping the sand-liquid mixed liquid to a carbon dioxide and sand-liquid stirring tank through a solid piston pump, simultaneously pumping liquid carbon dioxide to the carbon dioxide and sand-liquid stirring tank through a carbon dioxide booster pump, fully mixing the liquid carbon dioxide and the sand-liquid through a circulating injector and a rotary valve, and finally pumping the mixed liquid into a shaft through a booster pump truck; wherein:
The sand-carrying fluid is special for carbon dioxide, the pre-cooling temperature of the sand-carrying fluid is controlled to be minus 35 ℃ through a liquid refrigerating device, and the usage amount of the sand-carrying fluid is 2% or less than 2% of the volume of liquid carbon dioxide; an air seal device is arranged below the sand feeder, high-pressure rotary discharging is carried out by using the air seal device, and propping agent and sand-carrying fluid enter a sand mixing and stirring tank at an input rate of 1:1; the rotary valve is internally arranged at the outlet of the carbon dioxide and sand liquid stirring tank, and the maximum sand output of the carbon dioxide and sand liquid stirring tank is 12 cubic meters per minute;
The device that carbon dioxide thickening and sand integration method adopted, including liquid cooler (1), add sand ware (2), mix sand agitator tank (4), solid piston pump (5), carbon dioxide booster pump (6), rotary valve (8), carbon dioxide and sand liquid agitator tank (9), blow-down valve (10), the export of liquid cooler (1) is through the pipe connection with the entry of mix sand agitator tank (4), the export of add sand ware (2) is connected with the entry linkage of mix sand agitator tank (4), the export of mix sand agitator tank (4) is connected with the entry of solid piston pump (5), the export of solid piston pump (5) is connected with the entry of carbon dioxide and sand liquid agitator tank (9), the export of carbon dioxide booster pump (6) is connected with the entry of carbon dioxide and sand liquid agitator tank (9), rotary valve (8) are adorned in the bottom exit of carbon dioxide and sand liquid agitator tank (9), the bottom export of carbon dioxide and sand liquid agitator tank (9) is connected with the entry of carbon dioxide booster pump (6), the export of carbon dioxide (6) is connected with entry, the entry of entry and carbon dioxide and sand liquid agitator tank (9) top sets up the vent, the vent is provided with the atmospheric release.
2. The carbon dioxide thickening and sand adding integrated method according to claim 1, wherein: the solid piston pump adopts a hydraulic valve type piston pump.
3. A device adopted by the carbon dioxide thickening and sand adding integrated method as claimed in claim 1 or 2, which is characterized in that: including liquid cooler (1), add sand ware (2), sand agitator tank (4), solid piston pump (5), carbon dioxide booster pump (6), rotary valve (8), carbon dioxide and sand liquid agitator tank (9), blow-down valve (10), the export of liquid cooler (1) is through the pipe connection with the entry of sand agitator tank (4), the export of sand adder (2) is connected with the entry linkage of sand agitator tank (4), the export of sand agitator tank (4) is connected with the entry linkage of solid piston pump (5), the export of solid piston pump (5) is connected with the entry of carbon dioxide and sand liquid agitator tank (9), the export of carbon dioxide booster pump (6) is connected with the entry of carbon dioxide and sand liquid agitator tank (9), rotary valve (8) are adorned in the bottom exit of carbon dioxide and sand liquid agitator tank (9), the bottom exit of carbon dioxide and sand liquid agitator tank (9) is connected with the entry linkage of carbon dioxide booster pump (6), the export of carbon dioxide and sand liquid agitator tank (9) are connected with the pit shaft entry, the top of carbon dioxide and sand liquid agitator tank (9) is provided with gas discharge mouth, blow-down valve (10) are located at gas discharge opening.
4. A device for the carbon dioxide thickening and sand adding integrated method according to claim 3, wherein: the sand feeder also comprises an air seal device (3), wherein the air seal device (3) is arranged at the outlet of the lower part of the sand feeder (2).
5. The device adopted by the carbon dioxide thickening and sand adding integrated method according to claim 4, which is characterized in that: the device also comprises a circulating injector (7), wherein the circulating injector (7) is positioned in the carbon dioxide and sand liquid stirring tank (9), and the inlet of the circulating injector (7) is connected with the outlet I of the carbon dioxide booster pump (6).
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| CN202110099202.6A CN112727425B (en) | 2021-01-25 | 2021-01-25 | Carbon dioxide thickening and sand adding integrated method and device |
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| CN202110099202.6A CN112727425B (en) | 2021-01-25 | 2021-01-25 | Carbon dioxide thickening and sand adding integrated method and device |
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| CN113563860B (en) * | 2021-08-22 | 2022-04-26 | 大庆永铸石油技术开发有限公司 | Preparation method of slickwater fracturing fluid system for shale oil reservoir and pumping method thereof |
| CN116785990B (en) * | 2023-08-23 | 2023-12-22 | 大庆信辰油田技术服务有限公司 | Continuous airtight sand mixing device for carbon dioxide fracturing |
| CN116927745B (en) * | 2023-09-18 | 2023-12-15 | 大庆信辰油田技术服务有限公司 | Booster pump sled for carbon dioxide fracturing |
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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 |
| CN111042794A (en) * | 2019-12-31 | 2020-04-21 | 延安双丰集团有限公司 | Carbon dioxide fracturing construction process for normal-pressure sand mixing |
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| CN108374655B (en) * | 2018-04-02 | 2023-11-17 | 中国石油天然气集团有限公司 | Liquid carbon dioxide dry sand fracturing system and technological process |
| CN111363533B (en) * | 2018-12-25 | 2022-03-22 | 北京爱普聚合科技有限公司 | Normal-pressure sand mixing quasi-dry fracturing method, fracturing fluid used in method, preparation method and application |
| CN109812254B (en) * | 2019-01-24 | 2019-08-30 | 西南石油大学 | Load fluid conveying experimental provision and method in a kind of simulation fracturing fracture |
| CN111894543B (en) * | 2020-07-16 | 2023-04-25 | 中国石油天然气股份有限公司 | Liquid carbon dioxide anhydrous fracturing normal-pressure sand adding method and device |
| AU2020102869A4 (en) * | 2020-10-19 | 2020-12-17 | Yangtze University | Visual simulation device and evaluation method for sand-carrying and sand-laying of carbon dioxide fracturing fluid |
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| CN111042794A (en) * | 2019-12-31 | 2020-04-21 | 延安双丰集团有限公司 | Carbon dioxide fracturing construction process for normal-pressure sand mixing |
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