CN112727425A - 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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- CN112727425A CN112727425A CN202110099202.6A CN202110099202A CN112727425A CN 112727425 A CN112727425 A CN 112727425A CN 202110099202 A CN202110099202 A CN 202110099202A CN 112727425 A CN112727425 A CN 112727425A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 328
- 239000004576 sand Substances 0.000 title claims abstract description 225
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 171
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 164
- 238000000034 method Methods 0.000 title claims abstract description 52
- 230000008719 thickening Effects 0.000 title claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 176
- 238000003756 stirring Methods 0.000 claims abstract description 78
- 238000002156 mixing Methods 0.000 claims abstract description 57
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 239000007787 solid Substances 0.000 claims abstract description 19
- 238000005086 pumping Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 5
- 238000005057 refrigeration Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 abstract description 15
- 238000010276 construction Methods 0.000 abstract description 13
- 230000000903 blocking effect Effects 0.000 abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 188
- 238000005516 engineering process Methods 0.000 description 6
- 239000006004 Quartz sand Substances 0.000 description 5
- 230000009466 transformation Effects 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
- 239000012530 fluid Substances 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 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
- 238000007599 discharging Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 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
- 239000003079 shale oil 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
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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
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- 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)
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
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- 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: the sand adding device adds sand, the cooler refrigerates the sand carrying liquid, the sand carrying liquid and the propping agent are mixed in the sand mixing stirring tank, the piston type solid pump transmits the high-concentration sand liquid to the stirring tank, the booster pump pumps liquid carbon dioxide, the liquid carbon dioxide enters the carbon dioxide stirring tank through the circulating ejector, and the rotary valve is used for controlling the mixed sand liquid to enter the fracturing truck. The carbon dioxide thickening and sand adding integrated method and device provided by the invention solve the problems of low viscosity of carbon dioxide, difficulty in sand carrying and low sand ratio, reduce sand blocking risk in the carbon dioxide sand adding process, and realize stable sand adding at a high sand ratio in carbon dioxide fracturing construction.
Description
Technical Field
The invention belongs to the field of oil and gas development, and particularly relates to a method for realizing liquid carbon dioxide thickening and continuous sand adding in a carbon dioxide sand adding fracturing transformation process.
Background
The carbon dioxide fracturing technology is a continuously perfect fracturing technology, compared with the traditional fracturing technology taking water-based fracturing fluid as a main component, the carbon dioxide fracturing technology has the characteristics of small reservoir pollution, large modification strength, long effect period and the like, and particularly has better application effect on unconventional difficultly-modified reservoirs such as high-water-content or water-lock reservoirs, clay mineral reservoirs which are easy to migrate or expand, low-permeability reservoirs and the like and reservoirs with difficult fracturing fluid flowback. Since the first application in north america in the 80 th of the 20 th century, the method has been widely applied to the transformation of various oil and gas reservoirs such as low-permeability and compact sandstone, shale oil and gas and the like. Along with the continuous increase of the development strength of unconventional oil and gas resources in China, the carbon dioxide fracturing technology is gradually popularized and applied in various oil fields in China. However, at present, domestic CO2The fracturing equipment has obvious gap compared with the international advanced level, especially CO2The sand adding aspect has obvious defects. On the one hand CO2The viscosity 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 the low-temperature sand carrying liquid are not mature enough, which provides higher requirements for the thickening performance of carbon dioxide and the low-temperature sand conveying capacity.
CO2Fracturing needs to be carried out precooling on a propping agent in a sand mixing truck, the propping agent contains water, and the freezing can be carried out at low temperature, so that the propping agent is agglomerated, the difficulty of stable sand conveying is increased, and even the risk of sand blocking is caused. The early-stage domestic and foreign carbon dioxide sand adding method mainly utilizes pressure capacityThe vessel is pre-filled with liquid carbon dioxide and proppant and then transported using a separate screw system. Before entering a high-pressure pump truck, a closed sand mixing device is used for mixing a propping agent and liquid carbon dioxide fracturing fluid, the propping agent and the liquid carbon dioxide in a container with pressure are precooled, and then the mixture is conveyed through an independent spiral system. The traditional sand mixing equipment mostly uses a horizontal or vertical sand mixing tank, so that the rotating speed of a stirring shaft is low, the stirring shaft is short, dead angles exist in stirring, mechanical parts are easily abraded, and the maintenance cost is high; furthermore, pressurized vessels are limited in volume, containing up to 25 tons of liquid carbon dioxide, and require a relatively long period of time to load proppant. In addition, due to liquid CO2The viscosity is low, the sand carrying performance is poor, and therefore, the problem of easy sand setting exists.
CO2CO is severely restricted by lagging thickening and sand adding processes2Fracturing is widely used in domestic oil fields. In the process of adding the sand into the carbon dioxide, the carbon dioxide is influenced by temperature and pressure, phase change and CO2Thickening and sand-carrying entering high-pressure pump truck, then the pumping is very big to the target stratum degree of difficulty, needs urgently to design a technology that can realize thickening and add sand integratedly, realizes high sand ratio and adds sand in guaranteeing carbon dioxide fracturing to improve reservoir transformation effect, realize the high-efficient development to hyposmosis oil gas.
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 viscosity of carbon dioxide, difficulty in sand carrying and low sand ratio, reduce sand blocking risk in the carbon dioxide sand adding process and realize stable sand adding at high sand ratio in carbon dioxide fracturing construction.
The invention relates to a carbon dioxide thickening and sand adding integrated method, which comprises the following steps of firstly, controlling precooling temperature by adopting a liquid cooler to cool sand carrying liquid, pumping the cooled sand carrying liquid to a sand mixing stirring tank, simultaneously, enabling a propping agent to enter the sand mixing stirring tank through a sand adding device, and mixing the sand carrying liquid and the propping agent in the sand mixing stirring tank; then, the sand-liquid mixed liquid is pumped to a carbon dioxide and sand-liquid stirring tank through a solid piston pump, meanwhile, a carbon dioxide booster pump is used for pumping liquid carbon dioxide to the carbon dioxide and sand-liquid stirring tank, a circulating ejector and a rotary valve are used for fully mixing the liquid carbon dioxide and the sand-liquid, and finally, a booster pump truck is used for pumping the mixed liquid into a shaft.
The carbon dioxide thickening and sand adding integrated method is characterized in that the sand carrying liquid is special for carbon dioxide, the sand carrying liquid is controlled to be at a precooling temperature of-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.
The invention relates to a carbon dioxide thickening and sand adding integrated method, wherein an air seal machine is arranged below a sand adding machine, high-pressure rotary unloading is carried out by utilizing the air seal machine, and a propping agent and a sand carrying liquid enter a sand mixing stirring tank at an input speed of 1: 1.
The invention relates to 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: the sand-carrying liquid and the propping agent are mixed and the liquid carbon dioxide and the sand liquid are mixed, so that integration of carbon dioxide thickening and continuous sand adding can be realized, high-sand-ratio sand carrying is realized by using the high-performance sand-carrying liquid, liquid carbon dioxide and the sand liquid are fully mixed through multi-stage mixing, pressure fluctuation in the construction process caused by uneven sand mixing is avoided, the sand outlet concentration can be effectively controlled according to the construction requirement, the requirement of continuous sand adding in carbon dioxide fracturing construction is finally realized, and the success rate of operation and the yield increasing effect after pressing are ensured.
The invention relates to a device adopted by 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 the outlet of the liquid cooler is connected with the inlet of the sand mixing stirring tank through a pipeline, the outlet of the sand adding device is connected with the inlet of the sand mixing stirring tank, the outlet of the sand mixing stirring tank is connected with the inlet of the solid piston pump, the outlet of the solid piston pump is connected with a first inlet of the carbon dioxide and sand liquid stirring tank, a first outlet of the carbon dioxide booster pump is connected with a second inlet of the carbon dioxide and sand liquid stirring tank, the rotary valve is arranged at the outlet at the bottom end of the carbon dioxide and sand liquid stirring tank, the outlet at the bottom end of the carbon dioxide and sand liquid stirring tank is connected with the, the top of carbon dioxide and sand liquid agitator tank is provided with gas discharge port, and the atmospheric valve sets up in gas discharge port department.
The device adopted by the carbon dioxide thickening and sand adding integrated method also comprises an air seal machine, wherein the air seal machine is arranged at an outlet below the sand adding machine.
The device adopted by the carbon dioxide thickening and sand adding integrated method further comprises a circulating ejector, the circulating ejector is located in the carbon dioxide and sand liquid stirring tank, and an inlet of the circulating ejector is connected with an outlet I of the carbon dioxide booster pump.
The device adopted by 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 taken as a whole to realize the full mixing of the sand carrying liquid and the propping agent, and the circulating ejector, the rotary valve, the carbon dioxide and sand liquid stirring tank and the blow-down valve are taken as a whole to fully mix the liquid carbon dioxide and sand liquid mixed liquid, so that the sand blocking risk in the carbon dioxide sand adding process is reduced, and the high sand ratio stable sand adding in the carbon dioxide fracturing construction is realized.
The invention will be further explained with reference to the drawings.
Drawings
Fig. 1 is a schematic overall flow diagram of the carbon dioxide thickening and sand adding integrated method of the present invention, and is also a schematic overall diagram of an apparatus used in the carbon dioxide thickening and sand adding integrated method.
Detailed Description
The invention discloses 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 process of carbon dioxide sand adding fracturing transformation, and mainly comprises six steps: the sand adding device adds sand, the cooler refrigerates sand-carrying liquid, the sand-carrying liquid and a propping agent are mixed in a sand mixing stirring tank, a piston type solid pump transmits high-concentration sand liquid to the stirring tank, a booster pump pumps liquid carbon dioxide, the liquid carbon dioxide enters a carbon dioxide stirring tank through a circulating ejector, and the mixed sand liquid is controlled by a rotary valve to enter a fracturing truck for carbon dioxide sand adding fracturing operation, as shown in figure 1, the carbon dioxide thickening and sand adding integrated method specifically comprises the following steps:
step 1: the ceramsite or the quartz sand enters a sand mixing and stirring tank 4 through a sand inlet auger of a sand adding device 2 and an air seal machine 3;
according to the actual condition of the formation pressure and the propping strength of the propping agent, ceramsite or quartz sand with the particle size of 30-50 meshes or less is selected, the propping agent is filled from a sand filling port after being dried, the loading of the propping agent is driven by the rotation of the packing auger, the sand filling speed is controlled by the rotation speed of the packing auger, and the packing auger roller is connected with the air seal machine 3, so that the instability of sand filling caused by the escape of gas phase components in the process is avoided, and the stable sand filling is realized and the sand enters the sand mixing stirring tank.
The ceramic particles or quartz sand adopt propping agents with medium and low density, 30-50 meshes and smaller grain diameter, which is beneficial to carrying the sand with high efficiency by the sand carrying liquid.
Step 2: the sand-carrying liquid is cooled by the liquid cooler 1 and then is pumped to the sand-mixing stirring tank 4;
selecting a special sand-carrying liquid for carbon dioxide, controlling the sand-carrying liquid (thickening agent) to a precooling temperature (-35 ℃) through a liquid cooler, wherein the using amount of the sand-carrying liquid is 2% or less than 2% of the volume of the liquid carbon dioxide, specifically determining according to the sand adding requirement, the ratio of the sand-carrying liquid to the propping agent is not less than 1:1, and conveying the sand-carrying liquid to a sand mixing stirring tank after cooling.
The cooling of the sand-carrying liquid adopts special refrigeration equipment (liquid cooler 1), so that the sand-carrying liquid 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.
And step 3: fully mixing the ceramsite or the quartz sand and the sand-carrying liquid in a sand mixing stirring tank 4;
controlling the sand feeding speed of the sand mixing stirring tank 4 and the conveying speed of the cooled sand-carrying liquid, ensuring that the proppant and the sand-carrying liquid enter the sand mixing stirring tank at the input rate of 1:1 or the input rate of a set proportion, and realizing preliminary mixing of the proppant and the sand-carrying liquid in the sand mixing tank.
And 4, step 4: the sand liquid is pumped to a carbon dioxide and sand liquid stirring tank 9 by a piston solid pump 5;
and the mixed sand liquid is conveyed by a hydraulic valve type solid piston pump, so that the sand liquid is continuously and stably conveyed into a 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 continuously and stably pump sand liquid to the carbon dioxide and sand liquid stirring tank 9.
And 5: liquid carbon dioxide flows through a circulating ejector 7 from a carbon dioxide booster pump 6 and enters a carbon dioxide and sand liquid stirring tank 9;
the liquid carbon dioxide flows through the circulating ejector 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 in the period, the whole process temperature is basically equal to the temperature in the tank (namely kept at-18 ℃), so the whole process is liquid, if the gasified carbon dioxide is emptied by the carbon dioxide booster pump 6 separation tank, the liquid level of the separation tank is strictly monitored, the liquid level of the separation tank is ensured not to be lower than 2/3, the tank pressure is not lower than 1.2MPa, and the condition that the emptying pump/load change is violent is avoided. The pressurized liquid carbon dioxide enters a carbon dioxide and sand liquid stirring tank 9 through a circulating ejector 7, so that the stability of carbon dioxide injected by a pump is ensured.
Step 6: after being fully mixed, the liquid carbon dioxide and the sand liquid are connected with the inlet of the shaft through the outlet at the lower part of the carbon dioxide and sand liquid stirring tank 9 and are supplied to the fracturing truck through the main pipeline.
The pumping speed and the sand liquid pumping speed of the liquid carbon dioxide are controlled, the liquid carbon dioxide pressurized by the booster pump enters the carbon dioxide and sand liquid stirring tank 9 through the circulating ejector 7 and is mixed with the sand liquid, the circulating ejector 7 generates a liquid carbon dioxide vortex, the sand liquid load can be adjusted, 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 agitator tank has built-in rotary valve and pressure control system, and it is unbalanced to adjust agitator tank internal pressure, controls out sand concentration according to the construction demand, guarantees that construction pressure is stable. The atmospheric valve is reserved to the agitator tank and gasification in preventing the flow to utilize visual viewing aperture in time to detect the mixing situation of sand liquid in the agitator tank, the fracturing truck is supplied with through the trunk line by agitator tank bottom outlet to final intensive mixing's liquid carbon dioxide and sand liquid, and discharge capacity and pressure are controlled strictly in the work progress, avoid appearing the superpressure.
A rotary valve 8 is arranged in 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 the sand carrying liquid with the propping agent and mixing the liquid carbon dioxide with the sand liquid are adopted, so that carbon dioxide thickening and continuous sand adding integration can be realized, high-sand-ratio sand carrying is realized by using the high-performance sand carrying liquid, the liquid carbon dioxide and the sand liquid are fully mixed through multi-stage mixing, pressure fluctuation in the construction process caused by uneven sand mixing is avoided, the sand production concentration can be effectively controlled according to the construction requirement, the requirement of continuous sand adding in carbon dioxide fracturing construction is finally realized, and the success rate of operation and the yield increasing effect after pressing are ensured.
As shown in figure 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 seal machine 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 an air release valve 10, wherein the inlet of the liquid cooler 1 is an inlet for carrying sand liquid, the outlet of the liquid cooler 1 is connected with the inlet of the sand mixing stirring tank 4 through a pipeline, the air seal machine 3 is arranged at the lower outlet of the sand adding device 2, the sand adding device 2 and the air seal machine 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 sand liquid stirring tank 9, the circulating ejector 7 is positioned in the carbon dioxide and sand liquid stirring tank 9, the entry of carbon dioxide booster pump 6 and the exit linkage of liquid carbon dioxide storage tank, the export of carbon dioxide booster pump 6 is passed carbon dioxide and sand liquid agitator tank 9's entry two and is connected with circulation ejector 7's entry, rotary valve 8 is 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 and the entry linkage of carbon dioxide booster pump 6, the export of carbon dioxide booster pump 6 two and pit shaft entry linkage, carbon dioxide and sand liquid agitator tank 9's top is provided with gas discharge port, atmospheric valve 10 sets up in gas discharge port department.
As shown in fig. 1, a liquid cooler 1 provides cooling sand-carrying liquid, an air seal device 3 is arranged below a sand feeder 2, the air seal device 3 is used for high-pressure rotary discharging, a propping agent (ceramsite or quartz sand) and the sand-carrying liquid enter a sand mixing stirring tank 4, the cooling sand-carrying liquid and the propping agent are mixed in the sand mixing stirring tank 4 and then are pumped to a carbon dioxide and sand liquid stirring tank 9 by a solid piston pump 5, liquid carbon dioxide is pumped to the carbon dioxide and sand liquid stirring tank 9 by a carbon dioxide booster pump 6 through a carbon dioxide booster pump outlet I to be mixed with sand liquid in the tank, and then the mixed liquid carbon dioxide and sand liquid mixed liquid is pumped into a shaft by the carbon dioxide booster pump 6 through a carbon dioxide booster pump outlet II. Wherein the sand adding device 2 and the air seal machine 3 are arranged on the sand mixing stirring tank 4 together to be a whole to realize the full mixing of the sand-carrying liquid and the propping agent; the circulating ejector 7, the rotary valve 8, the cold sand stirring tank 9 and the emptying valve 10 are taken as a whole to fully mix the liquid carbon dioxide and sand-liquid mixed liquid.
The device adopted by the carbon dioxide thickening and sand adding integrated method reduces sand blocking risk in the carbon dioxide sand adding process, and realizes stable sand adding at a high sand ratio in carbon dioxide fracturing construction.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (8)
1. A carbon dioxide thickening and sand adding integrated method is characterized in that: firstly, a liquid cooler is adopted to control precooling temperature to cool sand-carrying liquid and then pump the cooled sand-carrying liquid to a sand mixing stirring tank, meanwhile, a propping agent also enters the sand mixing stirring tank through a sand feeder, and the sand-carrying liquid and the propping agent are mixed in the sand mixing stirring tank; then, the sand-liquid mixed liquid is pumped to a carbon dioxide and sand-liquid stirring tank through a solid piston pump, meanwhile, a carbon dioxide booster pump is used for pumping liquid carbon dioxide to the carbon dioxide and sand-liquid stirring tank, a circulating ejector and a rotary valve are used for fully mixing the liquid carbon dioxide and the sand-liquid, and finally, a booster pump truck is used for pumping the mixed liquid into a shaft.
2. The integrated method for thickening and sanding carbon dioxide according to claim 1, characterized in that: the sand-carrying liquid is special sand-carrying liquid for carbon dioxide, the pre-cooling temperature of the sand-carrying liquid is controlled to be-35 ℃ through liquid refrigeration equipment, and the using amount of the sand-carrying liquid is 2% or less than 2% of the volume of the liquid carbon dioxide.
3. The integrated method for thickening and sanding carbon dioxide according to claim 1, characterized in that: an air seal machine is arranged below the sand feeder, the air seal machine is used for high-pressure rotary unloading, and the propping agent and the sand-carrying liquid enter a sand mixing stirring tank at the input speed of 1: 1.
4. The integrated method for thickening and sanding carbon dioxide according to claim 1, characterized in that: the solid piston pump adopts a hydraulic valve type piston pump.
5. The integrated method for thickening and sanding carbon dioxide according to claim 1, characterized in that: the rotary valve is 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.
6. An apparatus for the integrated method of carbon dioxide thickening and sanding according to any of claims 1-5, wherein: comprises a liquid cooler (1), a sand adding device (2), a sand mixing stirring tank (4), a solid piston pump (5), a carbon dioxide booster pump (6), a rotary valve (8), a carbon dioxide and sand liquid stirring tank (9) and an emptying valve (10), wherein the outlet of the liquid cooler (1) is connected with the inlet of the sand mixing stirring tank (4) through a pipeline, 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 sand liquid stirring tank (9), the outlet of the carbon dioxide booster pump (6) is connected with the inlet of the carbon dioxide and sand liquid stirring tank (9), the rotary valve (8) is arranged at the bottom end of the carbon dioxide and sand liquid stirring tank (9), the outlet of the carbon dioxide and sand liquid stirring tank (9) is connected with the inlet of the carbon dioxide booster pump (6), an outlet II of the carbon dioxide booster pump (6) is connected with an inlet of the shaft, a gas discharge port is formed in the top end of the carbon dioxide and sand liquid stirring tank (9), and an emptying valve (10) is arranged at the gas discharge port.
7. The device adopted by the carbon dioxide thickening and sand adding integrated method according to claim 6 is characterized in that: the sand-adding device also comprises an air seal machine (3), wherein the air seal machine (3) is arranged at an outlet below the sand-adding device (2).
8. The device adopted by the carbon dioxide thickening and sand adding integrated method according to claim 7 is characterized in that: the device is characterized by further comprising a circulating ejector (7), wherein the circulating ejector (7) is located in the carbon dioxide and sand liquid stirring tank (9), and an inlet of the circulating ejector (7) is connected with an outlet of the carbon dioxide booster pump (6).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113563860A (en) * | 2021-08-22 | 2021-10-29 | 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 |
| CN116785990A (en) * | 2023-08-23 | 2023-09-22 | 大庆信辰油田技术服务有限公司 | Continuous airtight sand mixing device for carbon dioxide fracturing |
| CN116927745A (en) * | 2023-09-18 | 2023-10-24 | 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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| 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 |
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