CN113738333B - Carbon dioxide thickening fracturing system and technological method thereof - Google Patents
Carbon dioxide thickening fracturing system and technological method thereof Download PDFInfo
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- CN113738333B CN113738333B CN202111208843.7A CN202111208843A CN113738333B CN 113738333 B CN113738333 B CN 113738333B CN 202111208843 A CN202111208843 A CN 202111208843A CN 113738333 B CN113738333 B CN 113738333B
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 252
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 126
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 126
- 238000000034 method Methods 0.000 title claims abstract description 54
- 230000008719 thickening Effects 0.000 title claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 293
- 239000002562 thickening agent Substances 0.000 claims abstract description 139
- 239000012530 fluid Substances 0.000 claims abstract description 98
- 239000004576 sand Substances 0.000 claims abstract description 45
- 239000011550 stock solution Substances 0.000 claims abstract description 43
- 230000008569 process Effects 0.000 claims abstract description 33
- 238000002347 injection Methods 0.000 claims description 60
- 239000007924 injection Substances 0.000 claims description 60
- 239000000243 solution Substances 0.000 claims description 57
- 238000003860 storage Methods 0.000 claims description 47
- 239000003795 chemical substances by application Substances 0.000 claims description 41
- 238000007789 sealing Methods 0.000 claims description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 238000002360 preparation method Methods 0.000 claims description 28
- 238000004519 manufacturing process Methods 0.000 claims description 24
- 238000004873 anchoring Methods 0.000 claims description 22
- 239000011259 mixed solution Substances 0.000 claims description 15
- 238000005488 sandblasting Methods 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000008602 contraction Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000012360 testing method Methods 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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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/665—Compositions based on water or polar solvents containing inorganic compounds
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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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/2605—Methods for stimulating production by forming crevices or fractures using gas or liquefied gas
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/2607—Surface equipment specially adapted for fracturing operations
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
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Abstract
The invention is suitable for the field of fracturing transformation, and provides a carbon dioxide thickening fracturing system, which comprises an output system, a fracturing fluid treatment system and a liquid CO 2 treatment system: the fracturing fluid treatment system includes: a liquid CO 2 thickener stock solution treatment system and a fracturing fluid thickening system; the process method comprises the following steps: 1) The invention realizes thickening of liquid carbon dioxide, seam making of thickened liquid carbon dioxide, sand carrying of thickened liquid carbon dioxide and liquid together and the like by the aid of the program design of pumping of fracturing fluid and liquid carbon dioxide, can effectively reduce the influence of liquid on a reservoir, improves the flowback rate, furthest ensures the reservoir reconstruction effect and improves the single well yield.
Description
Technical Field
The invention belongs to the field of fracturing transformation, and particularly relates to a carbon dioxide thickening fracturing system and a process method thereof.
Background
The fracturing modification technology is the most direct and effective method for improving the recovery ratio and the single well yield. Numerous field tests and applications have been performed over the years in the oil and gas industry, and various technological methods for improving the fracturing modification effect have been developed. The CO 2 fracturing process is a transformation process for replacing water-based fracturing fluid with liquid CO 2 on the basis of the traditional fracturing process, and mainly adopts liquid CO 2 to make a joint and carry sand so as to achieve the aim of reservoir transformation.
Chinese patent CN110761764a discloses a liquid carbon dioxide fracturing method, which is an optimization design for a dry method CO 2 fracturing process, and the problem to which the method is directed does not relate to the performance aspect of CO 2 itself;
The invention relates to a supercritical carbon dioxide fracturing yield increasing process in China patent 2019100482187 (application number) and CN109736767A (bulletin number), which is a CO 2 pure dry fracturing process, namely, only liquid CO 2 is used in the fracturing process, but no water-based fracturing fluid is involved;
Chinese patent CN108864387B provides a drag reducer for dry fracturing of carbon dioxide and application thereof, which is a drag reducer developed for dry fracturing of carbon dioxide, is an optimization of liquid carbon dioxide, and does not relate to a related process method of combining water base with liquid carbon dioxide.
Disclosure of Invention
The invention aims to provide a carbon dioxide thickening fracturing system and a process method thereof, and aims to solve the problem that conventional liquid carbon dioxide cannot normally form a seam in a reservoir.
The invention is realized in such a way that the carbon dioxide thickening fracturing system comprises an output system, a fracturing fluid treatment system and a liquid CO 2 treatment system:
The fracturing fluid treatment system includes: a liquid CO 2 thickener stock solution treatment system and a fracturing fluid thickening system;
the liquid CO 2 thickener stock solution treatment system comprises: the liquid CO 2 thickener raw solution tank 18, the CO 2 thickener solution preparation tank, a water storage tank, a sand mixing liquid supply vehicle, a liquid high-pressure pump vehicle and a fracturing fluid wellhead injection head; the liquid high-pressure pump truck is connected with the output system through a normal-temperature and high-pressure pipeline, the liquid high-pressure pump truck is connected with the sand mixing liquid supply truck through a medium-pressure normal-temperature pipeline, the sand mixing liquid supply truck is connected with the CO 2 thickener solution preparation tank through a low-pressure normal-temperature pipeline, the CO 2 thickener solution preparation tank is connected with the liquid CO 2 thickener stock solution tank through a low-pressure normal-temperature pipeline, the thickener solution preparation tank is connected with the water storage tank through a low-pressure normal-temperature pipeline, and the water storage tank is connected with the sand mixing liquid supply truck through a low-pressure normal-temperature pipeline;
the fracturing fluid thickening system is connected with the sand mixing liquid supply vehicle, and the liquid CO 2 treatment system is connected with one end of the output system;
The output system includes: the method comprises the steps of producing a sleeve, telescoping a short joint, fracturing a well completion oil pipe, sealing a hydraulic anchor by high-pressure gas at a safety joint, sealing an anchoring packer by high-pressure gas at a high-pressure gas, a sand blast nozzle, a reservoir crack, injecting into a wellhead and perforating holes; the telescopic short joint, the safety joint, the low-temperature high-pressure air sealing hydraulic anchor, the low-temperature high-pressure air sealing anchoring packer and the sand blast nozzle are respectively connected with a fracturing completion oil pipe, the perforation holes are arranged on the production casing, the fracturing fluid wellhead injection head is arranged at the injection wellhead and connected with a normal-temperature high-pressure pipeline;
the liquid CO 2 processing system includes: the device comprises a liquid carbon dioxide storage tank, a low-temperature pipeline, a carbon dioxide booster pump, a medium-pressure low-temperature pipeline, a liquid carbon dioxide high-pressure pump truck, a low-temperature high-pressure pipeline and a liquid carbon dioxide wellhead injection head; the liquid carbon dioxide storage tank is connected with the carbon dioxide booster pump through a low-temperature pipeline, the carbon dioxide booster pump is connected with the liquid carbon dioxide high-pressure pump truck through a medium-pressure low-temperature pipeline, the liquid carbon dioxide high-pressure pump truck is connected with the liquid carbon dioxide wellhead injection head through a low-temperature high-pressure pipeline, and the liquid carbon dioxide wellhead injection head is connected with the injection wellhead;
the carbon dioxide thickening fracturing process method comprises the following steps:
1) The telescopic short joint, the safety joint, the low-temperature high-pressure air sealing hydraulic anchor, the low-temperature high-pressure air sealing anchoring packer, the sand blast nozzle and the fracturing completion oil pipe are put into a well together through a well repairing machine, the low-temperature high-pressure air sealing anchoring packer is set and started in a mode of rotating the fracturing completion oil pipe, and the anchoring machine is contacted with the inner wall of the production casing and anchored;
2) The concentration of the CO 2 thickener stock solution in the liquid CO 2 thickener stock solution tank is 80-90%, the CO 2 thickener stock solution is conveyed to the CO thickener solution preparation tank through a low-pressure normal-temperature pipeline, the water storage tank is conveyed to the CO 2 thickener solution preparation tank through a low-pressure normal-temperature pipeline, the CO 2 thickener stock solution and water are mixed in the CO 2 thickener solution preparation tank, the concentration of the CO 2 thickener stock solution is diluted to 12-17%, the CO 2 thickener solution preparation tank conveys the diluted CO 2 thickener solution with the concentration of 12-17% to the sand mixing liquid supply vehicle through the low-pressure normal-temperature pipeline, the water storage tank conveys the water to the sand mixing liquid supply vehicle through the low-pressure normal-temperature pipeline, and the CO 2 thickener solution and the water are mixed in the sand mixing liquid supply vehicle, so that the CO 2 thickener solution with the concentration of 1-1.5% of the CO 2 thickener solution is formed;
3) The fracturing fluid thickener stock solution storage tank conveys the fracturing fluid thickener to a sand mixing liquid supply vehicle through a low-pressure normal-temperature pipeline, the fracturing fluid thickener is mixed with CO 2 thickener solution with the concentration of 1-1.5%, so that fracturing fluid with the concentration of 0.4-0.8% is formed, and the viscosity of the fracturing fluid is 40-60mPa.S;
4) The sand mixing liquid supply vehicle pressurizes the mixed solution with the concentration of the CO 2 thickening agent of 1-1.5% and the concentration of the fracturing liquid thickening agent of 0.4-0.8% to 0.5-0.8MPa, and then the mixed solution is conveyed to the liquid high-pressure pump vehicle through the medium-pressure normal-temperature pipeline, and the liquid high-pressure pump vehicle pressurizes the fracturing liquid with the concentration of the CO 2 thickening agent of 1-1.5% and the concentration of the fracturing liquid thickening agent of 0.4-0.8% to 50-65MPa, and then the fracturing liquid is conveyed to the fracturing liquid wellhead injection head through the normal-temperature high-pressure pipeline;
5) The low-temperature low-pressure liquid CO 2 with the temperature of minus 35-28 ℃ in the liquid carbon dioxide storage tank is conveyed to a carbon dioxide booster pump through a low-temperature pipeline, the carbon dioxide booster pump boosts the temperature of the low-temperature liquid CO 2 to 2.4-3.0MPa, the temperature of the liquid CO 2 is increased to minus 20-16 ℃, the carbon dioxide booster pump boosts the temperature of the liquid CO 2 and then conveys the liquid CO 2 to a liquid carbon dioxide high-pressure pump truck through a medium-pressure low-temperature pipeline, the pressure of the liquid CO 2 with the pressure of 2.4-2.8MPa and the temperature of minus 20-16 ℃ is pressurized to 50-65MPa through the liquid carbon dioxide high-pressure pump truck, the temperature is increased to more than 0 ℃, and then conveyed to a liquid carbon dioxide wellhead injection head through the low-temperature high-pressure pipeline;
6) Mixing the treated fracturing fluid in the step 4) with the liquid CO 2 treated by the liquid carbon dioxide high-pressure pump truck 5 in the step 5) at an injection wellhead 28, extracting a CO 2 thickener from the mixed solution by the liquid CO 2 in the mixing process, increasing the viscosity of the liquid CO 2 from 0.3-0.5 Pa.S to 40-60mPa.S, and enabling the displacement of the liquid carbon dioxide entering the injection wellhead from the liquid carbon dioxide wellhead injection head to be 2.5-3 times that of the fracturing fluid entering the injection wellhead from the fracturing fluid wellhead injection head in the mixing process;
7) The mixed liquid of the liquid CO 2 and the fracturing fluid is conveyed to the sand-blasting nozzle 26 in the fracturing completion oil pipe 22, enters the production casing 20, and then enters the reservoir through the perforation holes 31 to form a reservoir fracture 27;
8) The fracturing propping agent storage tank conveys the fracturing propping agent to the sand mixing liquid supply vehicle through the propping agent conveying pipeline, the fracturing propping agent is mixed with the liquid CO 2 and the mixed liquid of the fracturing liquid, the viscosity of the liquid CO 2 at the moment reaches 40-60mPa.S after thickening, the fracturing propping agent can be effectively carried, the fracturing propping agent, the fracturing liquid and the liquid CO 2 are conveyed to the sand-blasting nozzle through the fracturing completion oil pipe, enter into the production casing pipe and then enter into the reservoir fracture through the perforation holes, the fracturing liquid and the liquid CO 2 are subjected to fluid loss and enter into the reservoir, the propping agent is left in the reservoir fracture, and the fracture is supported, so that the fracture form is kept in an open state all the time.
Further technical scheme, fracturing fluid thickening system includes: a fracturing propping agent storage tank and a fracturing fluid thickening agent stock solution storage tank; the fracturing propping agent storage tank is connected with a propping agent conveying pipeline, the propping agent conveying pipeline is connected with the sand mixing liquid supply vehicle through a low-pressure normal-temperature pipeline, and the fracturing liquid thickener stock solution storage tank is connected with the sand mixing liquid supply vehicle through a low-pressure normal-temperature pipeline.
According to a further technical scheme, the liquid carbon dioxide wellhead injection head is installed on the injection wellhead in a flange mode, and the fracturing fluid wellhead injection head is connected with the injection wellhead in a flange mode.
According to a further technical scheme, the telescopic short joint, the safety joint, the low-temperature high-pressure air sealing hydraulic anchor, the high-temperature high-pressure air sealing anchoring packer and the sand blasting nozzle are connected with the fracturing well completion oil pipe in a threaded mode.
Compared with the prior art, the invention has the following beneficial effects:
According to the invention, through the design of the fracturing fluid and the liquid carbon dioxide pumping program, the thickening of the liquid carbon dioxide, the joint making of the thickened liquid carbon dioxide and the common sand carrying of the thickened liquid carbon dioxide and the liquid are realized, the liquid carbon dioxide generates the phase change from the liquid state to the gas state in the reservoir during the flowback process, the injected fracturing is completely displaced out of the ground, the influence of the liquid on the reservoir is effectively reduced, the flowback rate is improved, the reservoir reconstruction effect is ensured to the maximum extent, and the single well yield is improved.
Drawings
Fig. 1 is a schematic diagram of connection between system structures in an embodiment of the present invention.
Reference numerals annotate: 1a liquid carbon dioxide storage tank, 2a low-temperature pipeline, 3a carbon dioxide booster pump, 4a medium-pressure low-temperature pipeline, 5 a liquid carbon dioxide high-pressure pump truck, 6 a low-temperature high-pressure pipeline, 7 a liquid carbon dioxide wellhead injection head, 8 a fracturing fluid wellhead injection head, 9a normal-temperature high-pressure pipeline, 10 a liquid high-pressure pump truck, 12a sand mixing fluid supply truck, 13 a low-pressure normal-temperature pipeline, 14CO 2 a thickener solution configuration tank, 18 a liquid CO 2 thickener stock solution tank, 19 a water storage tank, 20 a production casing, 21 a telescopic short joint, 22a fracturing completion oil pipe, 23 a safety joint, 24 a low-pressure high-pressure gas sealing hydraulic anchor, 25 a high-pressure gas sealing anchoring packer, 26 a sand blast nozzle, 27 a reservoir fracture, 28 an injection wellhead, 30 a fracturing fluid thickener stock solution storage tank, 31 perforation holes, 32 a fracturing proppant storage tank and 33a proppant conveying pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and the following examples. 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.
Specific implementations of the invention are described in detail below in connection with specific embodiments.
Embodiment 1, a carbon dioxide thickening fracturing process method, comprising the following steps:
1) The telescopic short joint 21, the safety joint 23, the low-temperature high-pressure air sealing hydraulic anchor 24, the low-temperature high-pressure air sealing anchoring packer 25 and the sand-blasting nozzle 26 are put into a well together with the fracturing well completion oil pipe 22 through a well repairing machine, the high-temperature high-pressure air sealing anchoring packer 25 is started in a seat sealing mode through rotating the fracturing well completion oil pipe 22, and the anchoring machine is contacted with the inner wall of the production casing 20 and anchored;
The sealing element is tightly adhered to the inner wall of the production casing 20 to play a role in sealing, the low-temperature high-pressure gas sealing hydraulic anchor 24 is started when high-pressure fracturing fluid and liquid CO 2 enter the oil pipe and is contacted and anchored with the inner wall of the production casing 20, when the low-temperature liquid CO 2 enters the fracturing completion oil pipe 22, the fracturing completion oil pipe 22 is contracted due to the change of temperature, at the moment, the telescopic short joint 21 is opened and further stretches to compensate the contraction distance generated by the fracturing completion oil pipe 22, and the safety of a pipe column is ensured;
2) The concentration of the CO 2 thickener stock solution in the liquid CO 2 thickener stock solution tank is 80%, the CO 2 thickener stock solution is conveyed to the CO 2 thickener solution preparation tank 14 through the low-pressure normal temperature pipeline 13, the water storage tank 19 is conveyed to the CO 2 thickener solution preparation tank 14 through the low-pressure normal temperature pipeline 13, the CO 2 thickener stock solution is mixed with water in the CO 2 thickener solution preparation tank 14, the concentration of the CO 2 thickener stock solution is diluted to 12%, the CO 2 thickener solution preparation tank 14 conveys the diluted CO 2 thickener solution with the concentration of 12% to the sand-mixing liquid supply vehicle 12 through the low-pressure normal temperature pipeline 13, the water storage tank 19 conveys water to the sand-mixing liquid supply vehicle 12 through the low-pressure normal temperature pipeline 13, the CO 2 thickener solution is mixed with water in the sand-mixing liquid supply vehicle 12, and at this time, the CO 2 thickener solution with the concentration of 1% of the CO 2 thickener solution is formed;
3) The fracturing fluid thickener stock solution storage tank 30 conveys the fracturing fluid thickener to the sand mixing liquid supply vehicle 12 through a low-pressure normal-temperature pipeline 13, the fracturing fluid thickener is mixed with CO 2 thickener solution with concentration of 1% to form fracturing fluid with concentration of 0.4% and viscosity of 40mPa.S;
4) The sand mixing liquid supply vehicle 12 pressurizes the mixed solution with the concentration of the CO 2 thickening agent of 1% and the concentration of the fracturing fluid thickening agent of 0.4% to 0.5MPa, and then the mixed solution is conveyed to the liquid high-pressure pump vehicle 10 through a medium-pressure normal-temperature pipeline, and the liquid high-pressure pump vehicle 10 pressurizes the fracturing fluid with the concentration of the CO 2 thickening agent of 1% and the concentration of the fracturing fluid thickening agent of 0.4% to 50MPa and then the fracturing fluid is conveyed to the fracturing fluid wellhead injection head 8 through the normal-temperature high-pressure pipeline 9;
5) The low-temperature low-pressure liquid CO 2 with the temperature of minus 35 ℃ in the liquid carbon dioxide storage tank 1 is conveyed to the carbon dioxide booster pump 3 through the low-temperature pipeline 2, the carbon dioxide booster pump 3 boosts the temperature of the low-temperature liquid CO 2 to 2.4MPa, the temperature of the liquid CO 2 is increased to minus 20 ℃, the carbon dioxide booster pump 3 boosts the temperature of the liquid CO 2 and then conveys the liquid CO 2 to the liquid carbon dioxide high-pressure pump truck 5 through the medium-pressure low-temperature pipeline 4, the pressure of the liquid CO 2 with the pressure of 2.4MPa and the temperature of minus 20 ℃ is pressurized to 50MPa through the liquid carbon dioxide high-pressure pump truck 5, the temperature is increased to more than 0 ℃, and then the liquid CO is conveyed to the liquid carbon dioxide wellhead injection head 7 through the low-temperature high-pressure pipeline 6;
6) Mixing the treated fracturing fluid in the step 4) with the liquid CO 2 treated by the liquid carbon dioxide high-pressure pump truck 5 in the step 5) at an injection wellhead 28, extracting CO 2 thickener from the mixed solution by the liquid CO 2 in the mixing process, increasing the viscosity of the liquid CO 2 from 0.3mPa.S to 40mPa.S, and enabling the displacement of the liquid carbon dioxide from the liquid carbon dioxide wellhead injection head 7 to enter the injection wellhead 28 to be 2.5-3 times that of the fracturing fluid from the fracturing fluid wellhead injection head 8 to enter the injection wellhead 28 in the mixing process;
7) The mixed liquid of the liquid CO 2 and the fracturing fluid is conveyed to the sand-blasting nozzle 26 in the fracturing completion oil pipe 22, enters the production casing 20, and then enters the reservoir through the perforation holes 31 to form a reservoir fracture 27;
8) The fracturing propping agent storage tank 32 conveys the fracturing propping agent to the sand mixing liquid supply vehicle 12 through the propping agent conveying pipeline 33, and is mixed with the liquid CO 2 and the mixed liquid of the fracturing liquid, the viscosity of the liquid CO 2 at the moment reaches 40mPa.S after being thickened, the fracturing propping agent, the fracturing liquid and the liquid CO 2 can be effectively carried and conveyed to the sand-blast nozzle 26 through the fracturing completion oil pipe 22, enter the production casing 20 and then enter the reservoir fracture 27 through the perforation holes 31, the fracturing liquid and the liquid CO 2 are lost and enter the reservoir, and the propping agent is remained in the reservoir fracture 27 to support the fracture, so that the fracture form is kept in an open state all the time.
Embodiment 2, a carbon dioxide thickening fracturing process method, comprising the following steps:
1) The telescopic short joint 21, the safety joint 23, the low-temperature high-pressure air sealing hydraulic anchor 24, the low-temperature high-pressure air sealing anchoring packer 25 and the sand-blasting nozzle 26 are put into a well together with the fracturing well completion oil pipe 22 through a well repairing machine, the high-temperature high-pressure air sealing anchoring packer 25 is started in a seat sealing mode through rotating the fracturing well completion oil pipe 22, and the anchoring machine is contacted with the inner wall of the production casing 20 and anchored;
The sealing element is tightly adhered to the inner wall of the production casing 20 to play a role in sealing, the low-temperature high-pressure gas sealing hydraulic anchor 24 is started when high-pressure fracturing fluid and liquid CO 2 enter the oil pipe and is contacted and anchored with the inner wall of the production casing 20, when the low-temperature liquid CO 2 enters the fracturing completion oil pipe 22, the fracturing completion oil pipe 22 is contracted due to the change of temperature, at the moment, the telescopic short joint 21 is opened and further stretches to compensate the contraction distance generated by the fracturing completion oil pipe 22, and the safety of a pipe column is ensured;
2) The concentration of the CO 2 thickener stock solution in the liquid CO 2 thickener stock solution tank is 85%, the CO 2 thickener stock solution is conveyed to the CO 2 thickener solution preparation tank 14 through the low-pressure normal-temperature pipeline 13, the water storage tank 19 is conveyed to the CO 2 thickener solution preparation tank 14 through the low-pressure normal-temperature pipeline 13, the CO 2 thickener stock solution is mixed with water in the CO 2 thickener solution preparation tank 14, the concentration of the CO 2 thickener stock solution is diluted to 15%, the CO 2 thickener solution preparation tank 14 conveys the diluted CO 2 thickener solution with the concentration of 15% to the sand-mixing liquid supply vehicle 12 through the low-pressure normal-temperature pipeline 13, the water storage tank 19 conveys water to the sand-mixing liquid supply vehicle 12 through the low-pressure normal-temperature pipeline 13, and the CO 2 thickener solution is mixed with water in the sand-mixing liquid supply vehicle 12 to form a CO 2 thickener solution with the concentration of 1-1.5% of the CO 2 thickener solution;
3) The fracturing fluid thickener stock solution storage tank 30 conveys the fracturing fluid thickener to the sand mixing liquid supply vehicle 12 through a low-pressure normal-temperature pipeline 13, the fracturing fluid thickener is mixed with CO 2 thickener solution with the concentration of 1.2%, so that fracturing fluid with the concentration of 0.6% is formed, and the viscosity of the fracturing fluid is 50mPa.S;
4) The sand mixing liquid supply vehicle 12 pressurizes the mixed solution with the concentration of the CO 2 thickening agent of 1.2% and the concentration of the fracturing fluid thickening agent of 0.6% to 0.6MPa, then the mixed solution is conveyed to the liquid high-pressure pump vehicle 10 through a medium-pressure normal-temperature pipeline, the liquid high-pressure pump vehicle 10 pressurizes the fracturing fluid with the concentration of the CO 2 thickening agent of 1.2% and the concentration of the fracturing fluid thickening agent of 0.6% to 60MPa, and then the fracturing fluid is conveyed to the fracturing fluid wellhead injection head 8 through the normal-temperature high-pressure pipeline 9;
5) The low-temperature low-pressure liquid CO 2 with the temperature of minus 31 ℃ in the liquid carbon dioxide storage tank 1 is conveyed to the carbon dioxide booster pump 3 through the low-temperature pipeline 2, the carbon dioxide booster pump 3 boosts the temperature of the low-temperature liquid CO 2 to 2.6MPa, the temperature of the liquid CO 2 is raised to minus 18 ℃, the carbon dioxide booster pump 3 boosts the pressure of the liquid CO 2 and then conveys the liquid CO 2 to the liquid carbon dioxide high-pressure pump truck 5 through the medium-pressure low-temperature pipeline 4, the pressure of the liquid CO 2 with the pressure of 2.6MPa and the temperature of minus 18 ℃ is pressurized to 60MPa through the liquid carbon dioxide high-pressure pump truck 5, the temperature is raised to more than 0 ℃, and then the liquid CO is conveyed to the liquid carbon dioxide wellhead injection head 7 through the low-temperature high-pressure pipeline 6;
6) Mixing the treated fracturing fluid in the step 4) with the liquid CO 2 treated by the liquid carbon dioxide high-pressure pump truck 5 in the step 5) at an injection wellhead 28, extracting CO 2 thickener from the mixed solution by the liquid CO 2 in the mixing process, increasing the viscosity of the liquid CO 2 from 0.4mPa.S to 50mPa.S, and enabling the displacement of the liquid carbon dioxide from the liquid carbon dioxide wellhead injection head 7 to enter the injection wellhead 28 to be 2.5-3 times that of the fracturing fluid from the fracturing fluid wellhead injection head 8 to enter the injection wellhead 28 in the mixing process;
7) The mixed liquid of the liquid CO 2 and the fracturing fluid is conveyed to the sand-blasting nozzle 26 in the fracturing completion oil pipe 22, enters the production casing 20, and then enters the reservoir through the perforation holes 31 to form a reservoir fracture 27;
8) The fracturing propping agent storage tank 32 conveys the fracturing propping agent to the sand mixing liquid supply vehicle 12 through the propping agent conveying pipeline 33, and is mixed with the liquid CO 2 and the mixed liquid of the fracturing liquid, the viscosity of the liquid CO 2 at the moment reaches 50mPa.S after being thickened, the fracturing propping agent, the fracturing liquid and the liquid CO 2 can be effectively carried and conveyed to the sand-blast nozzle 26 through the fracturing completion oil pipe 22, enter the production casing 20 and then enter the reservoir fracture 27 through the perforation holes 31, the fracturing liquid and the liquid CO 2 are lost and enter the reservoir, and the propping agent is remained in the reservoir fracture 27 to support the fracture, so that the fracture form is kept in an open state all the time.
Embodiment 3, a carbon dioxide thickening fracturing process method, comprising the following steps:
1) The telescopic short joint 21, the safety joint 23, the low-temperature high-pressure air sealing hydraulic anchor 24, the low-temperature high-pressure air sealing anchoring packer 25 and the sand-blasting nozzle 26 are put into a well together with the fracturing well completion oil pipe 22 through a well repairing machine, the high-temperature high-pressure air sealing anchoring packer 25 is started in a seat sealing mode through rotating the fracturing well completion oil pipe 22, and the anchoring machine is contacted with the inner wall of the production casing 20 and anchored;
The sealing element is tightly adhered to the inner wall of the production casing 20 to play a role in sealing, the low-temperature high-pressure gas sealing hydraulic anchor 24 is started when high-pressure fracturing fluid and liquid CO 2 enter the oil pipe and is contacted and anchored with the inner wall of the production casing 20, when the low-temperature liquid CO 2 enters the fracturing completion oil pipe 22, the fracturing completion oil pipe 22 is contracted due to the change of temperature, at the moment, the telescopic short joint 21 is opened and further stretches to compensate the contraction distance generated by the fracturing completion oil pipe 22, and the safety of a pipe column is ensured;
2) The concentration of the CO 2 thickener stock solution in the liquid CO 2 thickener stock solution tank is 90%, the CO 2 thickener stock solution is conveyed to the CO 2 thickener solution preparation tank 14 through the low-pressure normal temperature pipeline 13, the water storage tank 19 is conveyed to the CO 2 thickener solution preparation tank 14 through the low-pressure normal temperature pipeline 13, the CO 2 thickener stock solution is mixed with water in the CO 2 thickener solution preparation tank 14, the concentration of the CO 2 thickener stock solution is diluted to 17%, the CO 2 thickener solution preparation tank 14 conveys the diluted CO 2 thickener solution with the concentration of 17% to the sand-mixing liquid supply vehicle 12 through the low-pressure normal temperature pipeline 13, the water storage tank 19 conveys water to the sand-mixing liquid supply vehicle 12 through the low-pressure normal temperature pipeline 13, the CO 2 thickener solution is mixed with water in the sand-mixing liquid supply vehicle 12, and at this time, the CO 2 thickener solution with the concentration of the CO 2 thickener solution of 1.5% is formed;
3) The fracturing fluid thickener stock solution storage tank 30 conveys the fracturing fluid thickener to the sand mixing liquid supply vehicle 12 through a low-pressure normal-temperature pipeline 13, the fracturing fluid thickener is mixed with CO 2 thickener solution with concentration of 1.5%, so that fracturing fluid with concentration of 0.8% is formed, and the viscosity of the fracturing fluid is 60mPa.S;
4) The sand mixing liquid supply vehicle 12 pressurizes the mixed solution with the concentration of the CO 2 thickening agent of 1.5% and the concentration of the fracturing fluid thickening agent of 0.8% to 0.8MPa, then the mixed solution is conveyed to the liquid high-pressure pump vehicle 10 through a medium-pressure normal-temperature pipeline, the liquid high-pressure pump vehicle 10 pressurizes the fracturing fluid with the concentration of the CO 2 thickening agent of 1.5% and the concentration of the fracturing fluid thickening agent of 0.8% to 65MPa, and then the fracturing fluid is conveyed to the fracturing fluid wellhead injection head 8 through the normal-temperature high-pressure pipeline 9;
5) The low-temperature low-pressure liquid CO 2 with the temperature of-35 to 28 ℃ in the liquid carbon dioxide storage tank 1 is conveyed to the carbon dioxide booster pump 3 through the low-temperature pipeline 2, the carbon dioxide booster pump 3 boosts the temperature of the low-temperature liquid CO 2 to 3.0MPa, the temperature of the liquid CO 2 is increased to-16 ℃, the carbon dioxide booster pump 3 boosts the temperature of the liquid CO 2 and then conveys the liquid CO 2 to the liquid carbon dioxide high-pressure pump truck 5 through the medium-pressure low-temperature pipeline 4, the pressure of the liquid CO 2 with the pressure of 2.8MPa and the temperature of-16 ℃ is pressurized to 65MPa through the liquid carbon dioxide high-pressure pump truck 5, the temperature is increased to more than 0 ℃, and the liquid CO is conveyed to the liquid carbon dioxide wellhead injection head 7 through the low-temperature high-pressure pipeline 6;
6) Mixing the treated fracturing fluid in the step 4) with the liquid CO 2 treated by the liquid carbon dioxide high-pressure pump truck 5 in the step 5) at an injection wellhead 28, extracting a CO 2 thickener from the mixed solution by the liquid CO 2 in the mixing process, increasing the viscosity of the liquid CO 2 from 0.5 Pa.S to 60mPa.S, and enabling the displacement of the liquid carbon dioxide from the liquid carbon dioxide wellhead injection head 7 to enter the injection wellhead 28 to be 2.5-3 times that of the fracturing fluid from the fracturing fluid wellhead injection head 8 to enter the injection wellhead 28 in the mixing process;
7) The mixed liquid of the liquid CO 2 and the fracturing fluid is conveyed to the sand-blasting nozzle 26 in the fracturing completion oil pipe 22, enters the production casing 20, and then enters the reservoir through the perforation holes 31 to form a reservoir fracture 27;
8) The fracturing propping agent storage tank 32 conveys the fracturing propping agent to the sand mixing liquid supply vehicle 12 through the propping agent conveying pipeline 33, and is mixed with the liquid CO 2 and the mixed liquid of the fracturing liquid, the viscosity of the liquid CO 2 at the moment reaches 60mPa.S after being thickened, the fracturing propping agent, the fracturing liquid and the liquid CO 2 can be effectively carried and conveyed to the sand-blast nozzle 26 through the fracturing completion oil pipe 22, the fracturing propping agent, the fracturing liquid and the liquid CO 2 enter the reservoir fracture 27 through the perforation holes 31 after entering the production casing 20, the fracturing liquid and the liquid CO 2 are lost and enter the reservoir, and the propping agent stays in the reservoir fracture 27 to support the fracture, so that the fracture form is kept in an open state all the time.
The technical scheme of the invention for solving the problems is as follows:
1. The method for designing the liquid carbon dioxide pressure thickening fracturing process and the pumping program method comprises the following steps: the fracturing process is divided into two pumping ends, wherein the first pumping end is a pumping end of conventional liquid, and is mainly used for pumping fracturing fluid and carbon dioxide thickening agent to a fracturing wellhead, mixing the fracturing fluid and the carbon dioxide thickening agent with liquid carbon dioxide, and enabling the mixture to enter a reservoir through a fracturing string, and simultaneously pumping sand-carrying fluid and carrying fracturing propping agent into a crack. And the second is a pumping end of the liquid carbon dioxide, and the liquid carbon dioxide is pumped to a fracturing wellhead under pressure and mixed with the fracturing fluid and the carbon dioxide thickening agent. After mixing, the liquid carbon dioxide is extracted from the fracturing fluid to increase the viscosity of the thickening agent, and the thickening agent and the fracturing fluid enter a reservoir for joint making. In the propping agent adding stage, the thickened liquid carbon dioxide and the fracturing fluid carry propping agent together to enter the fracture.
2. The design is suitable for low temperature and resistant thickening liquid carbon dioxide fracturing technology tubular column that gas explosion, satisfies low temperature and resistant gasification carbon dioxide erosion, and tubular column adopts fixed knot to construct simultaneously, prevents because the tubular column peristaltic that liquid carbon dioxide phase state changes caused in the pump notes the in-process.
According to the invention, through the design of the fracturing fluid and the liquid carbon dioxide pumping program, the thickening of the liquid carbon dioxide, the joint making of the thickened liquid carbon dioxide and the common sand carrying of the thickened liquid carbon dioxide and the liquid are realized, the liquid carbon dioxide generates the phase change from the liquid state to the gas state in the reservoir during the flowback process, the injected fracturing is completely displaced out of the ground, the influence of the liquid on the reservoir is effectively reduced, the flowback rate is improved, the reservoir reconstruction effect is ensured to the maximum extent, and the single well yield is improved.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (4)
1. A carbon dioxide thickening and fracturing process method adopts a carbon dioxide thickening and fracturing system, wherein the system comprises an output system, a fracturing fluid treatment system and a liquid CO 2 treatment system:
The fracturing fluid treatment system includes: a liquid CO 2 thickener stock solution treatment system and a fracturing fluid thickening system;
The liquid CO 2 thickener stock solution treatment system comprises: a liquid CO 2 thickener raw solution tank, a CO 2 thickener solution preparation tank, a water storage tank, a sand mixing liquid supply vehicle, a liquid high-pressure pump vehicle and a fracturing fluid wellhead injection head; the liquid high-pressure pump truck is connected with the output system through a normal-temperature and high-pressure pipeline, the liquid high-pressure pump truck is connected with the sand mixing liquid supply truck through a medium-pressure normal-temperature pipeline, the sand mixing liquid supply truck is connected with the CO 2 thickener solution preparation tank through a low-pressure normal-temperature pipeline, the CO 2 thickener solution preparation tank is connected with the liquid CO 2 thickener stock solution tank through a low-pressure normal-temperature pipeline, the thickener solution preparation tank is connected with the water storage tank through a low-pressure normal-temperature pipeline, and the water storage tank is connected with the sand mixing liquid supply truck through a low-pressure normal-temperature pipeline;
The fracturing fluid thickening system is connected with the sand mixing liquid supply vehicle, and the liquid CO 2 treatment system is connected with one end of the output system;
The output system includes: the method comprises the steps of producing a sleeve, telescoping a short joint, fracturing a well completion oil pipe, sealing a hydraulic anchor by high-pressure gas at a safety joint, sealing an anchoring packer by high-pressure gas at a high-pressure gas, a sand blast nozzle, a reservoir crack, injecting into a wellhead and perforating holes; the telescopic short joint, the safety joint, the low-temperature high-pressure air sealing hydraulic anchor, the low-temperature high-pressure air sealing anchoring packer and the sand blast nozzle are respectively connected with a fracturing completion oil pipe, the perforation holes are arranged on the production casing, the fracturing fluid wellhead injection head is arranged at the injection wellhead and connected with a normal-temperature high-pressure pipeline;
the liquid CO 2 processing system includes: the device comprises a liquid carbon dioxide storage tank, a low-temperature pipeline, a carbon dioxide booster pump, a medium-pressure low-temperature pipeline, a liquid carbon dioxide high-pressure pump truck, a low-temperature high-pressure pipeline and a liquid carbon dioxide wellhead injection head; the liquid carbon dioxide storage tank is connected with the carbon dioxide booster pump through a low-temperature pipeline, the carbon dioxide booster pump is connected with the liquid carbon dioxide high-pressure pump truck through a medium-pressure low-temperature pipeline, the liquid carbon dioxide high-pressure pump truck is connected with the liquid carbon dioxide wellhead injection head through a low-temperature high-pressure pipeline, and the liquid carbon dioxide wellhead injection head is connected with the injection wellhead.
1) The telescopic short joint, the safety joint, the low-temperature high-pressure air sealing hydraulic anchor, the low-temperature high-pressure air sealing anchoring packer, the sand blast nozzle and the fracturing completion oil pipe are put into a well together through a well repairing machine, the low-temperature high-pressure air sealing anchoring packer is set and started in a mode of rotating the fracturing completion oil pipe, and the anchoring machine is contacted with the inner wall of the production casing and anchored;
2) The concentration of the CO 2 thickener stock solution in the liquid CO 2 thickener stock solution tank is 80-90%, the CO 2 thickener stock solution is conveyed to the CO 2 thickener solution preparation tank through a low-pressure normal-temperature pipeline, the water storage tank is conveyed to the CO 2 thickener solution preparation tank through a low-pressure normal-temperature pipeline, the CO 2 thickener stock solution and water are mixed in the CO 2 thickener solution preparation tank, the concentration of the CO 2 thickener stock solution is diluted to 12-17%, the CO 2 thickener solution preparation tank conveys the diluted CO 2 thickener solution with the concentration of 12-17% to the sand-mixing liquid-supplying vehicle through a low-pressure normal-temperature pipeline, the water storage tank conveys water to the sand-mixing liquid-supplying vehicle through a low-pressure normal-temperature pipeline, and the CO 2 thickener solution and water are mixed in the sand-mixing liquid-supplying vehicle to form a CO 2 thickener solution with the concentration of 1-1.5% in the CO 2 thickener solution;
3) The fracturing fluid thickener stock solution storage tank conveys the fracturing fluid thickener to a sand mixing liquid supply vehicle through a low-pressure normal-temperature pipeline, the fracturing fluid thickener is mixed with CO 2 thickener solution with the concentration of 1-1.5%, so that fracturing fluid with the concentration of 0.4-0.8% is formed, and the viscosity of the fracturing fluid is 40-60mPa.S;
4) The sand mixing liquid supply vehicle pressurizes the mixed solution with the concentration of the CO 2 thickening agent of 1-1.5% and the concentration of the fracturing liquid thickening agent of 0.4-0.8% to 0.5-0.8MPa, and then the mixed solution is conveyed to the liquid high-pressure pump vehicle through the medium-pressure normal-temperature pipeline, and the liquid high-pressure pump vehicle pressurizes the fracturing liquid with the concentration of the CO 2 thickening agent of 1-1.5% and the concentration of the fracturing liquid thickening agent of 0.4-0.8% to 50-65MPa, and then the fracturing liquid is conveyed to the fracturing liquid wellhead injection head through the normal-temperature high-pressure pipeline;
5) The low-temperature low-pressure liquid CO 2 with the temperature of minus 35-28 ℃ in the liquid carbon dioxide storage tank is conveyed to a carbon dioxide booster pump through a low-temperature pipeline, the carbon dioxide booster pump boosts the low-temperature liquid CO 2 to 2.4-3.0MPa, the temperature of the liquid CO 2 is increased to minus 20-16 ℃, the carbon dioxide booster pump boosts the liquid CO 2 and then conveys the liquid CO 2 to a liquid carbon dioxide high-pressure pump truck through a medium-pressure low-temperature pipeline, the pressure of the liquid CO 2 with the pressure of 2.4-2.8MPa and the temperature of minus 20-16 ℃ is pressurized to 50-65MPa through the liquid carbon dioxide high-pressure pump truck (5), the temperature is increased to more than 0 ℃, and then the liquid CO is conveyed to a liquid carbon dioxide wellhead injection head through a low-temperature high-pressure pipeline;
6) Mixing the treated fracturing fluid in the step 4) with the liquid CO 2 treated by the liquid carbon dioxide high-pressure pump truck (5) in the step 5) at an injection wellhead (28), extracting a CO 2 thickener from the mixed solution by the liquid CO 2 in the mixing process, increasing the viscosity of the liquid CO 2 from 0.3-0.5mPa.S to 40-60mPa.S, and enabling the displacement of the liquid carbon dioxide from the liquid carbon dioxide wellhead injection head to the injection wellhead to be 2.5-3 times that of the fracturing fluid from the fracturing fluid wellhead injection head to the injection wellhead in the mixing process;
7) The mixed liquid of the liquid CO 2 and the fracturing fluid is conveyed to a sand-blasting nozzle in a fracturing completion oil pipe, enters a production casing, and enters a reservoir through perforation holes to form reservoir cracks;
8) The fracturing propping agent storage tank conveys the fracturing propping agent to the sand mixing liquid supply vehicle through the propping agent conveying pipeline, the fracturing propping agent is mixed with the liquid CO 2 and the mixed liquid of the fracturing liquid, the viscosity of the liquid CO 2 at the moment reaches 40-60mPa.S after thickening, the fracturing propping agent can be effectively carried, the fracturing propping agent, the fracturing liquid and the liquid CO 2 are conveyed to the sand-blasting nozzle through the fracturing completion oil pipe, enter into the production casing pipe and then enter into the reservoir fracture through the perforation holes, the fracturing liquid and the liquid CO 2 are subjected to fluid loss and enter into the reservoir, the propping agent is left in the reservoir fracture, and the fracture is supported, so that the fracture form is kept in an open state all the time.
2. The carbon dioxide thickening fracturing process of claim 1, wherein the fracturing fluid thickening system comprises: a fracturing propping agent storage tank and a fracturing fluid thickening agent stock solution storage tank; the fracturing propping agent storage tank is connected with a propping agent conveying pipeline, the propping agent conveying pipeline is connected with the sand mixing liquid supply vehicle through a low-pressure normal-temperature pipeline, and the fracturing liquid thickener stock solution storage tank is connected with the sand mixing liquid supply vehicle through a low-pressure normal-temperature pipeline.
3. The carbon dioxide thickening fracturing process of claim 1, wherein the liquid carbon dioxide wellhead injection head is flange mounted on the injection wellhead, and the fracturing fluid wellhead injection head is flange connected with the injection wellhead.
4. The carbon dioxide thickening fracturing process method according to claim 1, wherein the telescopic short joint, the safety joint, the low-temperature high-pressure gas sealing hydraulic anchor, the high-temperature high-pressure gas sealing anchoring packer and the sand blast nozzle are respectively connected with the fracturing completion oil pipe in a threaded mode.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1752404A (en) * | 2004-09-20 | 2006-03-29 | 西安益友石油科技有限公司 | Gas well separate layer fracturing and producing integrated well completing pipe string and technique |
| 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 |
| CN216198026U (en) * | 2021-10-18 | 2022-04-05 | 延安双丰集团有限公司 | A carbon dioxide thickening fracturing system |
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| US5069283A (en) * | 1989-08-02 | 1991-12-03 | The Western Company Of North America | Fracturing process using carbon dioxide and nitrogen |
| US5002125A (en) * | 1989-08-02 | 1991-03-26 | The Western Company Of North America | Fracturing process using a viscosity stabilized energizing phase |
| US7726404B2 (en) * | 2008-04-16 | 2010-06-01 | Schlumberger Technology Corporation | Use of carbon-dioxide-based fracturing fluids |
| 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 |
| US10436001B2 (en) * | 2014-06-02 | 2019-10-08 | Praxair Technology, Inc. | Process for continuously supplying a fracturing fluid |
| US10081761B2 (en) * | 2014-12-22 | 2018-09-25 | Praxair Technology, Inc. | Process for making and supplying a high quality fracturing fluid |
| CN113266330A (en) * | 2021-06-18 | 2021-08-17 | 延安双丰集团有限公司 | Circumferential fracturing transformation process method for whole reservoir |
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| CN1752404A (en) * | 2004-09-20 | 2006-03-29 | 西安益友石油科技有限公司 | Gas well separate layer fracturing and producing integrated well completing pipe string and technique |
| 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 |
| CN216198026U (en) * | 2021-10-18 | 2022-04-05 | 延安双丰集团有限公司 | A carbon dioxide thickening fracturing system |
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