CN109594963A - A kind of improvement CO for shale gas reservoir fracturing reform2Dry method fracturing fluid and its preparation and evaluation method - Google Patents
A kind of improvement CO for shale gas reservoir fracturing reform2Dry method fracturing fluid and its preparation and evaluation method Download PDFInfo
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- CN109594963A CN109594963A CN201811487991.5A CN201811487991A CN109594963A CN 109594963 A CN109594963 A CN 109594963A CN 201811487991 A CN201811487991 A CN 201811487991A CN 109594963 A CN109594963 A CN 109594963A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—Injecting CO2 or carbonated water
Abstract
The invention belongs to oilfield chemistry fracturing fluid fields, and in particular to a kind of improvement CO for shale gas reservoir fracturing reform2Dry method fracturing fluid and its preparation and evaluation method.Improvement CO for shale gas reservoir fracturing reform2Dry method fracturing fluid, is calculated in mass percent, and raw material includes: the surfactant-based tackifier of 1.5%-3%, remaining is CO2；For surfactant-based tackifier with a head base and two double tail bases, head base is metal ion Co2+Or Ni2+The hydrophilic radical of composition, tail base are fluorinated parent CO2Group.CO is improved using the present invention2Dry method fracturing fluid carries out pressure break, does not expend water resource, no pollution to the environment small to reservoir damage, CO after construction2Become gaseous state and is quickly discharged from reservoir, it is obvious to shale gas reservoir effect of increasing production compared to existing conventional fracturing technology.
Description
Technical field
The invention belongs to oilfield chemistry fracturing fluid fields, and in particular to a kind of improvement for shale gas reservoir fracturing reform
CO2Dry method fracturing fluid and its preparation and evaluation method.
Background technique
For shale gas reservoir as one of main unconventional gas reservoir, exploration and development has become a heat of global resources exploitation
Point, China's shale gas resource potential is big, and distribution area is wide, and development series of strata are more, has and realizes the strong of shale gas great-leap-forward development
Condition.According to the national shale gas resource potential research and appraisal of the newest announcement of Ministry of Land and Resources as a result, China's shale gas oil in place
It is 134.42 × 1012m3, mining resources potentiality are 25.08 × 1012m3, the Sichuan Basin and its fringe area, middle Lower Yangtze massif,
Ordos Basin, the Caidamu Basin, Tarim Basin etc. are the key areas of China's shale gas exploration and development.According to the U.S.
Development Experience, horizontal well combination slippery water volume fracturing are the key technology and core technology of shale gas Efficient Exploration exploitation, but
This development technique needs to consume a large amount of water, and can cause greatly to destroy to environment, according to US Gov Env Protection Agency (EPA)
Statistics, single port shale gas well average consumption is 0.76 × 104~2.39 × 104T (depends on well depth, horizontal section length, pressure break
Scale).U.S.'s water resource relative abundance, substantially can satisfy exploitation demand.But water resources in china is relatively deficient, is difficult to meet big
Measure clear water demand.Largely there is the status of water shortage or few water, large-scale shale gas development of resources in China's shale gas enrichment region
A large amount of clear water resource can be consumed, the ecological environment of developing zone and people's lives is necessarily made to be faced with severe tests.U.S. master
Its Clay Mineral content of the shale gas basin wanted is few, and the brittle minerals such as quartz, feldspar content is high, and domestic shale gas reservoir
CLAY MINERALS AND THEIR SIGNIFICANCE content is higher, especially domestic terrestrial facies shale gas reservoir (such as Ordos Basin Triassic Yanchang Formation shale
Reservoir), clay mineral content is even more than 60%, when aqueous fracturing fluid invades shale reservoir, clay mineral water-swellable, meeting
Great permeability injury is caused to shale reservoir.Domestic shale reservoir especially terrestrial facies shale reservoir belongs to normal pressure or different mostly
Normal low pressure reservoir (pressure coefficient of the long 7 sections of shale of such as Triassic Yanchang Formation is 0.6~0.8), and the pore throat of shale is smaller, row
Drive pressure is higher, and the water-blocking effect for entering well working fluid is obvious, and discharge speed is slow after pressure.Therefore, opening for China's shale gas reservoir
For hair, foreign technology cannot be simply indiscriminately imitated, needs a kind of water consumption few (or even anhydrous), no pollution to the environment, to reservoir
Injure the small and row of returning rapidly advanced fracturing technique.
Summary of the invention
The deficiency of the aqueous fracturing fluid of shale gas reservoir fracturing reform is currently used for for solution, the purpose of the present invention is to provide
A kind of improvement CO for shale gas reservoir fracturing reform2Dry method fracturing fluid and its preparation and evaluation method.
The technical solution adopted by the invention is as follows:
A kind of improvement CO for shale gas reservoir fracturing reform2Dry method fracturing fluid, is calculated in mass percent, raw material packet
It includes:
The surfactant-based tackifier of 1.5%-3%, remaining is liquid CO2；
For surfactant-based tackifier with a head base and two double tail bases, head base is metal ion Co2+Or Ni2+Structure
At hydrophilic radical, tail base is fluorinated parent CO2Group.
Surfactant-based tackifier are mixed by host agent SF-1 and thickening aids SF-2 according to mass ratio for 1:1,
Wherein, host agent SF-1 is fluorine ether carboxylate class surfactant；Thickening aids SF-2 is complexation of metal ions organic salt.
A kind of improvement CO for shale gas reservoir fracturing reform2The preparation method of dry method fracturing fluid passes through high parameter pressure break
The preparation of fluidity energy test evaluation device；
When preparation:
CO2Pump defeated process:
CO2Gaseous state CO in gas cylinder2Liquid CO is cooled to through brine pit2Afterwards, liquid CO2Gas is carried out using intermediate cold tank
Liquid separation, when separation, gaseous state CO2In intermediate cold tank top, liquid CO2In intermediate cold tank lower part, intermediate cold tank lower part later
Liquid CO2It carries out pressurization into plunger pump to be pumped into, plunger pump is by liquid CO2When pressurization is sent out, pass through the intelligence of Frequency Converter Control
Energy flow meter is to liquid CO2Pump discharge set；
The input of surfactant-based tackifier and surfactant-based tackifier and liquid CO2Mixed process are as follows:
When plunger pump pumps out liquid CO2When, pass through counterbalance valve tune liquid CO2Pressure, to liquid CO2Pressure it is steady after,
Start dosing pump and liquid CO is added in surfactant-based tackifier2In mixed, bubble of the mixture of formation at threeway
It is uniformly mixed in foam generator and forms foam, the foam being subsequently formed enters heating system, and heating system is by the foam of formation
It is heated to preset temperature, obtains the improvement CO for being used for shale gas reservoir fracturing reform2Dry method fracturing fluid.
Temperature after foam heats in heating system is 0-100 DEG C.
It is a kind of to evaluate the above-mentioned improvement CO for shale gas reservoir fracturing reform2The method of dry method fracturing fluid, including rheology are surveyed
Examination and injury test；
The rheometer test is carried out using high parameter fracturing fluid property test evaluation device, and rheometer test is based on tubular type rheology
Instrument principle, the horizontal rheology test section length of tube type rheometer be 1m, horizontal rheology test section by three different tube diameters straight pipe
It composes in parallel, when rheometer test, the improvement CO of shale gas reservoir fracturing reform2After dry method fracturing fluid enters horizontal rheology test section,
By the pressure difference transmitter at horizontal rheology test section both ends to the improvement CO of shale gas reservoir fracturing reform2The friction pressure of dry method fracturing fluid
Drop data is acquired, the flow of plunger pump and dosing pump setting further according to high parameter fracturing fluid property test evaluation device,
Calculate the improvement CO of shale gas reservoir fracturing reform2The viscosity of dry method fracturing fluid, viscosity calculations formula are as follows:
Wherein,
Wherein, η is viscosity, τwFor shear stress, γ is shear rate, and Δ P is friction pressure drop, and D is caliber, and L is pipe range,
U is flow velocity；
Described injury test is carried out using high parameter fracturing fluid property test evaluation device, and injury test is used for page for test
The improvement CO of rock gas reservoir fracturing reform2Dynamic filtration injury rate of the dry method fracturing fluid to rock core；When injury test, rock is tested first
The original permeability of the heart, the measurement for then carrying out filter loss obtain pressure break finally by the measurement to core permeability after leak-off
Liquid calculates the dynamic filtration injury rate of rock core, the injury rate of core permeability according to the following formula:
In formula: αcFor permeability injury rate；K is core permeability before leak-off；K ' is the permeability of rock core after leak-off.
When rheometer test, the internal diameter of three straight tubes is respectively 6mm, 8mm and 10mm.
The minute of injury test is 36min.
It is 10-20MPa in pressure, temperature is 0-80 DEG C, shear rate 200-1000s-1Under the conditions of, it is described to be used for shale
The improvement CO of gas reservoir fracturing reform2The effective viscosity value of dry method fracturing fluid is 7.65~20.01mPas.
The improvement CO for shale gas reservoir fracturing reform2Dry method fracturing fluid is 0.63% to the injury rate of shale core
~3.84%.
The invention has the following beneficial effects:
Improvement CO for shale gas reservoir fracturing reform of the invention2Dry method fracturing fluid is a kind of CO of improvement2Dry method pressure break
Liquid, the CO of the improvement2Dry method fracturing fluid promotes CO using surfactant-based tackifier2Dry method fracturing fluid viscosity, with quality percentage
Number meter, component includes: the surfactant-based tackifier of 1.5%-3% and the liquid CO of 98.5%-97%2.Surface-active
Agent class tackifier have amphiphilic structure, and, with a head base and two double tail bases, head base is metal ion Co for it2+Or Ni2+It constitutes
Hydrophilic radical, and tail base is fluorinated parent CO2Group, CO2It is rodlike with being cross-linked to form in surfactant-based tackifier system
Or the hydrophilic radical of vermiculate glues is attracted by hydrone, while parent CO2Group is by CO2The attraction of molecule causes intermolecular
Interaction force increases, CO2Viscosity increases.Improve CO2It is living that the viscosity change of dry method fracturing fluid whole system is mainly derived from surface
The variation of property agent micellar space structure and CO2The deformation of drop.Improvement CO for shale gas reservoir fracturing reform of the invention2It is dry
When method fracturing fluid is developed for shale gas reservoir, water resource is not expended, no pollution to the environment small to reservoir damage, after construction
CO2Become gaseous state and is quickly discharged from reservoir, it is obvious to shale gas reservoir effect of increasing production compared to existing conventional fracturing technology.Pure CO2
Viscosity is small, and leak-off is serious, and prop-carrying capacity is poor, and the CO that the present invention improves2Dry method fracturing fluid viscosity is substantially improved, and is in pressure
10-20MPa, temperature are 0-80 DEG C, shear rate 200-1000s-1Under the conditions of, CO that the present invention improves2Dry method fracturing liquid
The effective viscosity value of system is between 7.65~20.01mPas, CO that the present invention improves2The effective viscosity of dry method fracturing fluid system
Pure CO under about identical operating condition286~218 times.The CO of improvement2Dry method fracturing fluid to the nocuity of shale core relatively
Low, core damage rate is between 0.63%~3.84%, compared to CO2Foam fracturing fluid, clean fracturing fluid, slippery water etc. are other
Water-based fracturing liquid system, the CO of improvement2Dry method fracturing fluid has apparent low damage to shale core.
Improvement CO for shale gas reservoir fracturing reform of the invention2Dry method fracturing fluid is due to using high parameter pressure break fluidity
Energy test evaluation device prepares (CN201510447789.X), when preparing by the device, passes through reasonable control parameter, energy
Access the improvement CO for shale gas reservoir fracturing reform of the invention2Dry method fracturing fluid.
In shale gas reservoir fracturing reform, CO is improved using the present invention2Dry method fracturing fluid carries out pressure break, and consumption of water does not provide
Source, no pollution to the environment small to reservoir damage, CO after construction2Become gaseous state and is quickly discharged from reservoir, it is normal compared to existing
Fracturing technology is advised, it is obvious to shale gas reservoir effect of increasing production.
Specific embodiment
Below in conjunction with detailed description of the invention by specific embodiments.
Improvement CO for shale gas reservoir fracturing reform of the invention2Dry method fracturing fluid, is calculated in mass percent, raw material
It include: the surfactant-based tackifier of 1.5%-3%, remaining is liquid CO2；Wherein, surfactant-based tackifier have
One head base and two double tail bases, head base is metal ion Co2+Or Ni2+The hydrophilic radical of composition, tail base are fluorinated parent CO2Base
Group.Surfactant-based tackifier are mixed by host agent SF-1 and thickening aids SF-2 according to mass ratio for 1:1, wherein
Host agent SF-1 is fluorine ether carboxylate class surfactant；Thickening aids SF-2 is complexation of metal ions organic salt.
Improvement CO for shale gas reservoir fracturing reform of the invention2The preparation and test of dry method fracturing fluid are using indoor high
Parameter fracturing fluid property test evaluation device (CN201510447789.X), process includes the following steps:
(1) raw material preparation:
CO2For technical grade, purity is greater than 99%；Host agent SF-1 is fluorine ether carboxylate class surfactant, thickening aids SF-
2 be complexation of metal ions organic salt, and host agent SF-1 and thickening aids SF-2 are indoor synthesis.
(2)CO2Pump defeated process:
CO in gas cylinder2After brine pit is cooled to liquid, gas-liquid separation is carried out using intermediate cold tank, since gas-liquid is close
Spend difference, CO2Gas is in intermediate cold tank top, CO2Liquid is in intermediate cold tank lower part, later the CO of intermediate cold tank lower part2Into
Enter plunger pump and carry out pressurization to be pumped into, plunger pump is by liquid CO2Flow when pressurization is sent out is 0-80L/h, passes through frequency converter control
The intelligent flow meter of system is to liquid CO2Pump discharge set.
(3) input and mixed process of additive:
It opens plunger pump and pumps out liquid CO2, and liquid CO is adjusted by counterbalance valve2Pressure, counterbalance valve adjusting range are 0-
50MPa pumps out liquid CO to plunger pump2Pressure it is steady after, starting dosing pump is by two kinds of additives, that is, host agent SF-1 fluorine ether carboxylic
Liquid CO is added in Barbiturates surfactant and thickening aids SF-2 complexation of metal ions organic salt2In, the flow tune of dosing pump
Whole range is 0-5L/h, liquid CO2It is mixed into heating system at threeway with additive, foam maker is housed at threeway,
Foam maker can guarantee surfactant-based tackifier and CO2It is uniformly mixed and forms foam.
(4) temperature controls:
Electric heating system is mainly made of transformer, pressure regulator, thermal insulation material, red copper electrode, thermocouple etc..Pass through pressure regulation
The handwheel of device can easily be adjusted electrical heating power, fluid temperature (F.T.) can be made to reach 0-100 DEG C, pass through thermocouple
It is measured and is monitored in real time with temperature of the data collection system to fluid and tube wall.
Improvement CO of the invention has just been prepared by above step2Dry method fracturing fluid.
The present invention is used for the improvement CO of shale gas reservoir fracturing reform2The performance test of dry method fracturing fluid is as follows:
(1) rheometer test
Improvement CO of the invention2Dry method fracturing fluid is mainly used in shale gas reservoir pressure break.Using indoor high parameter fracturing fluid
CO of the performance test evaluating apparatus (CN201510447789.X) to improvement2Dry method fracturing fluid carries out indoor rheometer test, rheology
Test is based on tube type rheometer principle, and horizontal rheology test section length is 1m, is composed in parallel by the straight pipe of three different tube diameters,
Internal diameter is respectively 6mm, 8mm and 10mm, and internal diameter 8mm straight pipe is selected to be tested, and improves CO2Dry method fracturing fluid enters level stream
After becoming test section, its friction pressure drop data is acquired by the pressure difference transmitter at test section both ends, further according to plunger pump and is added
The flow of Teat pipette setting, so that it may calculate improvement CO2The viscosity of dry method fracturing fluid, viscosity calculations formula are as follows:
Wherein,
Wherein, η is viscosity, τwFor shear stress, γ is shear rate, and Δ P friction pressure drop, D is caliber, and L is pipe range, U
For flow velocity.
In testing, pressure control is in 10-20MPa, and at 0-100 DEG C, tackifier concentration range is 2.0%- for temperature control
3.0%, shear rate is in 220-663s-1.Table 1 is to improve CO under different experimental conditions2Dry method fracturing fluid viscosity and pure CO2It is viscous
Degree.
Table 1
(2) injury test
When using pure CO2When carrying out pressure break to shale gas-bearing formation as fracturing fluid, stratum will not substantially be damaged, but
When in CO2After the middle surfactant-based tackifier of addition, it is possible to can affect to stratum, to the CO of improvement2Dry method
The core damage characteristic of fracturing fluid has carried out indoor test, the first original permeability of testing rock core, then carries out filter loss
Measurement, minute 36min obtain fracturing fluid to the dynamic of rock core finally by the measurement to core permeability after leak-off
The injury rate of leak-off injury rate, core permeability is calculated according to formula (4):
In formula: αc--- permeability injury rate/%；K --- core permeability/10 before leak-off-3μm2；K ' --- after leak-off
Permeability/10 of rock core-3μm2。
Using indoor high parameter fracturing fluid property test evaluation device (CN201510447789.X) to improvement CO2Dry method pressure
It splits liquid to be measured under different operating conditions by core permeability before and after shale core leak-off, obtain under different working conditions
Improve CO2The core damage of dry method fracturing fluid system.Having chosen the natural shale core of Ordos Basin, (length is
56.62mm, diameter 25.08mm), experimental temperature has chosen 10 DEG C, 20 DEG C, 40 DEG C and 60 DEG C four temperature spots, shear rate
Choose 50s-1And 170s-1The confining pressure of two shear rate measuring points, experimental pressure 10MPa, rock core is 12MPa, in test process
In, fracturing fluid is 3.5MPa by the pressure difference that rock core end face is formed.Table 2 is the CO improved under different operating conditions2Dry method fracturing fluid
Shale core injures characteristic test data table:
Table 2
From Table 2, it can be seen that the CO of improvement2Dry method fracturing fluid is relatively low to the nocuity of shale core, rock core wound
Evil rate is between 0.63%~3.84%, compared to CO2Other water-based fracturings such as foam fracturing fluid, clean fracturing fluid, slippery water
Liquid system, the CO of improvement2Dry method fracturing fluid has apparent low damage to shale core.
In conclusion the improvement CO for shale gas reservoir fracturing reform of the invention2Dry method fracturing fluid is applied at simulation scene
Indoor test is carried out under the conditions of work, effective viscosity value is between 7.65~20.01mPas, the CO of improvement2Dry method fracturing fluid
The effective viscosity of system is about pure CO under identical operating condition286~218 times, after improvement, viscosity is substantially improved.The CO of improvement2It is dry
Method fracturing fluid is relatively low to the nocuity of shale core, and core damage rate is between 0.63%~3.84%, compared to CO2Bubble
Other water-based fracturing liquid systems such as foam fracturing fluid, clean fracturing fluid, slippery water, the CO of improvement2Dry method fracturing fluid is to shale core
With apparent low damage, meet the pressing crack construction requirement of shale gas green, environmental protection, the country has no related patents and document report
Road.
It should be noted that the above embodiments do not limit the invention in any form, it is all to use equivalent replacement or equivalent change
The mode changed technical solution obtained, falls within the scope of protection of the present invention.
Claims (9)
1. a kind of improvement CO for shale gas reservoir fracturing reform2Dry method fracturing fluid, which is characterized in that it is calculated in mass percent,
Raw material includes: the surfactant-based tackifier of 1.5%-3%, remaining is liquid CO2；
Wherein, for surfactant-based tackifier with a head base and two double tail bases, head base is metal ion Co2+Or Ni2+Structure
At hydrophilic radical, tail base is fluorinated parent CO2Group.
2. a kind of improvement CO for shale gas reservoir fracturing reform according to claim 12Dry method fracturing fluid, feature exist
In surfactant-based tackifier are mixed by host agent SF-1 and thickening aids SF-2 according to mass ratio for 1:1, wherein
Host agent SF-1 is fluorine ether carboxylate class surfactant；Thickening aids SF-2 is complexation of metal ions organic salt.
3. a kind of prepare the improvement CO for being used for shale gas reservoir fracturing reform described in claim 1-2 any one2Dry method fracturing fluid
Method, which is characterized in that pass through high parameter fracturing fluid property test evaluation device prepare；
When preparation:
CO2Pump defeated process:
CO2Gaseous state CO in gas cylinder2Liquid CO is cooled to through brine pit2Afterwards, liquid CO2Gas-liquid point is carried out using intermediate cold tank
When from, separation, gaseous state CO2In intermediate cold tank top, liquid CO2In intermediate cold tank lower part, the liquid of intermediate cold tank lower part later
State CO2It carries out pressurization into plunger pump to be pumped into, plunger pump is by liquid CO2When pressurization is sent out, pass through the intelligence flow of Frequency Converter Control
Meter is to liquid CO2Pump discharge set；
The input of surfactant-based tackifier and surfactant-based tackifier and liquid CO2Mixed process are as follows:
When plunger pump pumps out liquid CO2When, pass through counterbalance valve tune liquid CO2Pressure, to liquid CO2Pressure it is steady after, starting
Liquid CO is added in surfactant-based tackifier by dosing pump2In mixed, the mixture of formation at threeway foam hair
Foam is uniformly mixed and formed in raw device, and the foam being subsequently formed enters heating system, and heating system heats the foam of formation
To preset temperature, the improvement CO for being used for shale gas reservoir fracturing reform is obtained2Dry method fracturing fluid.
4. according to the method described in claim 3, it is characterized in that, the temperature after foam heats in heating system is 0-100
℃。
5. it is a kind of evaluate as claimed in claim 1 or 22 described in be used for shale gas reservoir fracturing reform improvement CO2The method of dry method fracturing fluid,
It is characterised in that it includes rheometer test and injury test；
The rheometer test is carried out using high parameter fracturing fluid property test evaluation device, and it is former that rheometer test is based on tube type rheometer
Reason, the horizontal rheology test section length of tube type rheometer are 1m, and horizontal rheology test section is in parallel by the straight pipe of three different tube diameters
Composition, when rheometer test, the improvement CO of shale gas reservoir fracturing reform2After dry method fracturing fluid enters horizontal rheology test section, by water
Advection becomes the improvement CO of the pressure difference transmitter to shale gas reservoir fracturing reform at test section both ends2The friction pressure drop number of dry method fracturing fluid
According to being acquired, the flow of plunger pump and dosing pump setting further according to high parameter fracturing fluid property test evaluation device is calculated
The improvement CO of shale gas reservoir fracturing reform2The viscosity of dry method fracturing fluid, viscosity calculations formula are as follows:
Wherein,
Wherein, η is viscosity, τwFor shear stress, γ is shear rate, and Δ P is friction pressure drop, and D is caliber, and L is pipe range, and U is stream
Speed；
Described injury test is carried out using high parameter fracturing fluid property test evaluation device, and injury test is used for shale gas for test
Hide the improvement CO of fracturing reform2Dynamic filtration injury rate of the dry method fracturing fluid to rock core；When injury test, testing rock core first
Original permeability, the measurement for then carrying out filter loss obtain fracturing fluid pair finally by the measurement to core permeability after leak-off
The dynamic filtration injury rate of rock core, the injury rate of core permeability calculate according to the following formula:
In formula: αcFor permeability injury rate；K is core permeability before leak-off；K ' is the permeability of rock core after leak-off.
6. according to the method described in claim 5, it is characterized in that, when rheometer test, the internal diameter of three straight tubes be respectively 6mm,
8mm and 10mm.
7. according to the method described in claim 5, it is characterized in that, the minute of injury test is 36min.
8. according to method described in claim 5-7 any one, which is characterized in that pressure be 10-20MPa, temperature 0-
80 DEG C, shear rate 200-1000s-1Under the conditions of, the improvement CO for shale gas reservoir fracturing reform2Dry method fracturing fluid
Effective viscosity value is 7.65~20.01mPas.
9. according to method described in claim 5-7 any one, which is characterized in that described for shale gas reservoir fracturing reform
Improve CO2Dry method fracturing fluid is 0.63%~3.84% to the injury rate of shale core.
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| CN113719262A (en) * | 2021-09-08 | 2021-11-30 | 山东科技大学 | Self-foaming clean fracturing device and method based on carbon dioxide phase change |
| CN115370339A (en) * | 2021-05-21 | 2022-11-22 | 中国石油化工股份有限公司 | Application of key gaseous pollutants of fire coal in shale gas exploitation, hydraulic fracturing fluid and method for improving shale gas recovery ratio |
| CN115370339B (en) * | 2021-05-21 | 2024-04-16 | 中国石油化工股份有限公司 | Application of key gas pollutants of coal in shale gas exploitation, hydraulic fracturing fluid and method for improving shale gas recovery ratio |
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