CN110527504A - A kind of nano combined displacement type fracturing fluid - Google Patents
A kind of nano combined displacement type fracturing fluid Download PDFInfo
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- CN110527504A CN110527504A CN201910891343.4A CN201910891343A CN110527504A CN 110527504 A CN110527504 A CN 110527504A CN 201910891343 A CN201910891343 A CN 201910891343A CN 110527504 A CN110527504 A CN 110527504A
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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
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
- C09K8/685—Compositions based on water or polar solvents containing organic compounds containing cross-linking agents
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- 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
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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- 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
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
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Abstract
The present invention provides a kind of nano combined displacement type fracturing fluids, belong to fracturing fluid field.Nano combined displacement type fracturing fluid provided by the invention is a kind of novel, clean and environmental protection fracturing fluid system；I.e. with i.e. use, continuous mixture；Without matching liquid before construction, also there is no surplus liquid, deallocation liquid and clear tank link is saved, realizes site operation without waste；Work progress is pollution-free；Save water resource；Improve oil field production run efficiency；Resistance to low temperature is good, and with liquid with can be used under water not ice condition, performance is stablized；With good recuperability, water resource is saved；Has effects that good displacement oil gas；Performance is stablized, and the holding time is long；It is adaptable, it is low to being required with liquid water standard；Viscosity is adjustable, is adjusted and is formulated according to different well's conditions；Low frictional resistance；Solid-carrying performance is good；Heatproof resistant to shearing；Clean Low Damage；It is easy the row of returning, it is fast to break glue after pressure；Simple with liquid, plastic is fast, is suitble to online mixture；It is reusable.
Description
Technical field
The present invention relates to fracturing fluid technical field more particularly to a kind of nano combined displacement type fracturing fluids.
Background technique
Currently, the widely used fracturing fluid in oil field is mainly natural plant gum (guanidine glue and modified guanidine glue) fracturing fluid both at home and abroad, but
It is that there are seam function, prop-carrying capacity, drop frictional resistance ability and broken glue are ineffective for fracturing fluid for natural plant gum (guanidine glue and modified guanidine glue)
The problem of.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of nano combined displacement type fracturing fluids.It is provided by the invention to receive
Rice co-displacement type fracturing fluid seam function, prop-carrying capacity, drop frictional resistance ability and broken glue effect are better than traditional guanidine gum fracturing fluid
System.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
The present invention provides a kind of nano combined displacement type fracturing fluid, 100 parts of nano combined displacement type fracturing fluid packets
Include the component of following mass fraction: 0.25~0.5 part of chaotropic agent, 1~1.6 part of 12~20nm grades of lotion thickening agent, 0.4~0.8
Part crosslinking agent, 0.2~0.25 part of nanometer row drive the liquid water of agent and surplus, and the nanometer row drives agent and closes for 10nm grades of multicomponents
At additive, nanometer row drive agent by include organic solvent, surfactant, multicomponent organic acid, strong oxidizer, corrosion inhibiter,
Ferrous stability, clay stabilizer, chelating agent and suppression slag agent chemical synthesis.
Preferably, 100 parts of nano combined displacement type fracturing fluids further include 0.8 part of delayed cross-linking additive.
Preferably, the delayed cross-linking additive is polyhydroxy aldehyde, the anti-bleeding agent of LB-2, polyalcohol or soda ash.
Preferably, the chaotropic agent is acetamide.
Preferably, the 12~20nm grades of lotion thickening agent is by 2- acrylamide-2-methyl propane sulfonic, methacryloxypropyl
Ethyl-trimethyl salmiac, acrylic acid, octadecyl acrylate and acrylamide 3:1.8:1.5:1.2:2.5 in molar ratio
It emulsifies and obtains through fine grinding in 500 DEG C of high temperature polymerization 36h resulting polymers.
Preferably, the crosslinking agent is organic boron or organic zirconium.
Preferably, the liquid water includes fracturing outlet liquid, Halite water, purification sewage or stratum output water.
Preferably, contain oil in the fracturing outlet liquid.
It preferably, include one of magnesium ion, calcium ion and potassium ion or a variety of in the Halite water.
The present invention provides a kind of nano combined displacement type fracturing fluid, 100 parts of nano combined displacement type fracturing fluid packets
Include the component of following mass fraction: 0.25~0.5 part of chaotropic agent, 1~1.6 part of 12~20nm grades of lotion thickening agent, 0.4~0.8
Part crosslinking agent, 0.2~0.25 part of nanometer row drive the liquid water of agent and surplus, and the nanometer row drives agent and closes for 10nm grades of multicomponents
At additive, nanometer row drive agent by include organic solvent, surfactant, multicomponent organic acid, strong oxidizer, corrosion inhibiter,
Ferrous stability, clay stabilizer, chelating agent and suppression slag agent chemical synthesis.The present invention provides a kind of nano combined displacement types
Fracturing fluid drives the restriction of agent type by arranging nanometer, in conjunction with the dosage of each component, has obtained a kind of seam function, has taken sand energy
Power, drop frictional resistance ability and broken glue effect are better than the nano combined displacement type fracturing fluid of traditional guanidine colloid system fracturing fluid.The present invention
The nano combined displacement type fracturing fluid provided is a kind of novel, clean and environmental protection fracturing fluid system；I.e. with using, continuously mix
Match；Without matching liquid before construction, also there is no surplus liquid, deallocation liquid and clear tank link is saved, realizes site operation without waste；It constructed
Journey is pollution-free；Save water resource；Promote working efficiency；Reduce labor intensity；Finally improve oil field production run efficiency, operation
Cost decline；Resistance to low temperature is good, and with liquid with can be used under water not ice condition, performance is stablized；It is returned with good
The property received, again using water resource has been saved, realizes energy conservation and environmental protection, clean manufacturing, has good application value；Have
Good displacement oil gas effect.Nano combined displacement type fracturing fluid property provided by the invention is stablized, and the holding time is long；Adaptability
By force, low to being required with liquid water standard；Viscosity is adjustable, is adjusted and is formulated according to different well's conditions；Low frictional resistance, field application test drop resistance
Rate 70%；Solid-carrying performance is good, has good viscoplasticity；Heatproof resistant to shearing, viscosity have self-recovering function；Low Damage is cleaned,
It is residual to reservoir it is miscellaneous injure less it is small；It is easy the row of returning, it is fast to break glue after pressure；Simple with liquid, plastic is fast, is suitble to online mixture；It is repeatable to make
With environmental protection and economy.Embodiment statistics indicate that, nano combined displacement type fracturing fluid provided by the invention can use oil field output
Water saves water resource and water source cost, reduces environmentally friendly cost and environmental protection pressure；Not needing mixing vehicle, (pure liquid material does not need
Individually match liquid)；Outstanding 10~20 times of guanidine glue of sand time really realize that proppant is uniformly laid on crack top and bottom；Frozen glue
For drag reducing efficiency up to 70%, frozen glue discharge capacity realizes 10~12m3/ minute eliminates the limitation of frozen glue discharge capacity, reduces the construction time；Sand concentration can
Up to 50%.
Further, the liquid water that nano combined displacement type fracturing fluid provided by the invention uses include fracturing outlet liquid,
Halite water, purification sewage or stratum output water.
Further, nano combined displacement type fracturing fluid provided by the invention is based on zwitterion electric attraction principle, passes through
Specific cation monomer polymerization reactions add mating nanometer row and drive agent, develop salt resistance displacement type crosslinked fracturing fluid (dry powder and complete
Lotion) system, system has good anti-salt property to calcium, magnesium, potassium ion, therefore is suitable for the various sewage in oil field and matches liquid, real
The recycling of existing oilfield sewage.Meanwhile hydrophobic monomer can be realized water-oil separating, make full use of the organic matter in oilfield sewage.
Detailed description of the invention
Fig. 1 is that+0.6% nanometer of row of+0.25% chaotropic agent of+0.4% crosslinking agent of 1.3% nanoemulsions thickening agent drives agent composition
Heat resistance test curve of the nano combined displacement type fracturing fluid at 70 DEG C；
Fig. 2 is that+0.6% nanometer of row of+0.25% chaotropic agent of+0.5% crosslinking agent of 1.3% nanoemulsions thickening agent drives agent composition
Heat resistance test curve of the nano combined displacement type fracturing fluid at 90 DEG C；
Fig. 3 is to test song using the shear rate of nano combined displacement type fracturing fluid made from the high-salinity brine of salt lake
Line；
Fig. 4 is the shear rate trial curve of nano combined displacement type fracturing fluid made from 33 well water of vehicle water；
Fig. 5 is that the shear rate of nano combined displacement type fracturing fluid made from 2,100,000 side's effluent storage pond sewage tests song
Line；
Fig. 6 is the shear rate trial curve of nano combined displacement type fracturing fluid made from 81# treating stations purified water；
Fig. 7 is the contact angle test figure of 1.3% nanoemulsions thickening agent fracturing fluid；
Fig. 8 is the contact angle test figure of 1.5% nanoemulsions thickening agent fracturing fluid；
Fig. 9 is continuous mixed construction flow chart；
Figure 10 is nano combined displacement type fracturing fluid construction process schematic diagram；
Figure 11 is conventional guanidine gum fracturing fluid construction process schematic diagram；
Figure 12 is that nano combined displacement type fracturing fluid reuses flow diagram；
Figure 13 is Song-liao basin middle-shallow layer stratigraphic column；
Figure 14 is that configuration relation schematic diagram is stored up in Song-liao basin source；
Figure 15 is that production curve is sought in drain after pressing；
Figure 16 is rock core CT scan displacement of reservoir oil inversion chart；
Figure 17 is peaceful 209H18 platform target area horizontal projection；
Figure 18 is peaceful 209H18-1 well single hop liquid measure statistical chart；
Figure 19 is peaceful 209H18-1 well construction single hop sand feeding amount and comparison of design figure；
Figure 20 is peaceful 209H18-1 well construction discharge capacity, pump pressure statistical chart；
Figure 21 is each section of slippery water viscosity of peaceful 209H18-1 well and pH value field monitoring variation diagram；
Figure 22 is each section of peaceful 209H18-1 well linear adhesiveness and pH value field monitoring variation diagram；
Figure 23 is each section of slippery water of peaceful 209H18-1 well, linear glue resistance-reducing yield variation diagram；
Figure 24 is frequency and permeability relational graph；
Figure 25 is frequency and porosity relational graph；
Figure 26 is the deep 80 log analysis data curve graphs of moral；
Figure 27 is the deep 80 well logging total hydrocarbon peak curve of moral.
Specific embodiment
The present invention provides a kind of nano combined displacement type fracturing fluid, 100 parts of nano combined displacement type fracturing fluid packets
Include the component of following mass fraction: 0.25~0.5 part of chaotropic agent, 1~1.6 part of 12~20nm grades of lotion thickening agent, 0.4~0.8
Part crosslinking agent, 0.2~0.25 part of nanometer row drive the liquid water of agent and surplus, and the nanometer row drives agent and closes for 10nm grades of multicomponents
At additive, nanometer row drive agent by include organic solvent, surfactant, multicomponent organic acid, strong oxidizer, corrosion inhibiter,
Ferrous stability, clay stabilizer, chelating agent and suppression slag agent chemical synthesis.
The present invention driven to nanometer row is synthesized the organic solvent of agent, surfactant, multicomponent organic acid, strong oxidizer,
Corrosion inhibiter, ferrous stability, clay stabilizer, chelating agent and press down slag agent specific type and dosage there is no special limit
It is fixed, using commercial goods well known to those skilled in the art.The present invention is to the chemically synthesized actual conditions without spy
Different restriction, using mode well known to those skilled in the art.
In the present invention, it is also preferable to include 0.8 part of delayed cross-linkings to add for 100 parts of nano combined displacement type fracturing fluids
Agent.
In the present invention, the delayed cross-linking additive is preferably polyhydroxy aldehyde, the anti-bleeding agent of LB-2, polyalcohol or pure
Alkali.
In the present invention, the chaotropic agent is preferably acetamide.
In the present invention, 12~20nm grades described (nanoscale) the lotion thickening agent is preferably by 2- acrylamide -2- methyl-prop
Sulfonic acid, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, acrylic acid, octadecyl acrylate and acrylamide are in molar ratio
3:1.8:1.5:1.2:2.5 emulsifying and obtaining through fine grinding in 500 DEG C of high temperature polymerization 36h resulting polymers.
In the present invention, the crosslinking agent is preferably organic boron or organic zirconium.
In the present invention, the liquid water preferably includes fracturing outlet liquid, Halite water, purification sewage or stratum output
Water.The present invention does not have special restriction to the source of the fracturing outlet liquid, Halite water, purification sewage and stratum output water,
Using source well known to those skilled in the art.
In the present invention, oil is preferably comprised in the fracturing outlet liquid.
In the present invention, one of magnesium ion, calcium ion and potassium ion or a variety of are preferably included in the Halite water.
The present invention does not have special restriction to the preparation method of the nano combined displacement type fracturing fluid, using this field skill
Preparation method known to art personnel is made.
In order to further illustrate the present invention, below with reference to example to nano combined displacement type fracturing fluid provided by the invention into
Row describes in detail, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
One, laboratory experiment is evaluated
(1) thickening time
Pressure break formula of liquid: clear water+1.0~(nanoscale emulsion thickening agent is by 2- acryloyl for 1.6% nanoemulsions thickening agent
Amine -2- methyl propane sulfonic acid, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, acrylic acid, octadecyl acrylate and propylene
3:1.8:1.5:1.2:2.5 is emulsified in 500 DEG C of high temperature polymerization 36h resulting polymers through fine grinding and is obtained amide in molar ratio)
Table 1 is the relation table of reservoir temperature and nanoemulsions thickening agent additive amount, and table 2 is that different nanoemulsions thickening agents add
The viscosity data of amount in different time points, by table 1~2 it is found that nanoemulsions thickening agent meets water 1min viscosity stabilization, it can be achieved that even
Continuous mixture.
The relation table of 1 reservoir temperature of table and nanoemulsions thickening agent additive amount
Viscosity data of the different nanoemulsions thickening agent dosages of table 2 in different time
(2) heat resistance
Fig. 1 is that (nanoscale emulsion thickening agent is preferably by 2- acrylamide -2- methyl-prop sulphur for 1.3% nanoemulsions thickening agent
Acid, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, acrylic acid, octadecyl acrylate and acrylamide in molar ratio 3:
1.8:1.5:1.2:2.5 is emulsified through fine grinding in 500 DEG C of high temperature polymerization 36h resulting polymers and is obtained)+0.4% crosslinking agent is (organic
Boron)+0.6% nanometer of row of+0.25% chaotropic agent (acetamide) drive agent (by include organic solvent, it is surfactant, polynary organic
Acid, strong oxidizer, corrosion inhibiter, ferrous stability, clay stabilizer, chelating agent and suppression slag agent chemical synthesis) composition nanometer
Heat resistance test curve of the co-displacement type fracturing fluid at 70 DEG C, Fig. 2 are 1.3% nanoemulsions thickening agent (nanoscale cream
Liquid thickening agent is preferably by 2- acrylamide-2-methyl propane sulfonic, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, acrylic acid, ten
3:1.8:1.5:1.2:2.5 polymerize obtained by 500 DEG C of high temperature polymerization 36h in molar ratio for eight alkyl acrylates and acrylamide
Object is emulsified through fine grinding and obtain)+0.6 nanometer of row drive agent of+0.25% chaotropic agent (acetamide) of+0.5% crosslinking agent (organic boron) is (by wrapping
Include organic solvent, surfactant, multicomponent organic acid, strong oxidizer, corrosion inhibiter, ferrous stability, clay stabilizer, chelating
Agent and suppression slag agent chemical synthesis, ibid) heat resistance test curve of the nano combined displacement type fracturing fluid at 90 DEG C of composition,
By Fig. 1~2 it is found that nano combined displacement type fracturing fluid heat resistance provided by the invention is good.
(3) endurance of cutting energy
Fig. 3~6 be respectively using salt lake high-salinity brine, 33 well water of Che Shui, 2,100,000 side's effluent storage pond sewage and
The shear rate trial curve of nano combined displacement type fracturing fluid made from 81# treating stations purified water, by Fig. 3~6 it is found that this hair
The nano combined displacement type fracturing fluid resistant to shearing of bright offer.
(4) static outstanding grittiness energy
Successively using liquid water are as follows: salt lake high-salinity brine, 36 well water of Che Shui, 33 well water of Che Shui, 2,100,000 side of windy city are useless
Water storage pool sewage, 60 DEG C of viscous crude treating stations purified waters of oil extraction No.1 Factory viscous crude treating stations, No. 2 viscous crude multi-purpose station purified waters of windy city,
Vehicle arranges sub- 2 well well water of re-injection, the two factory 81# treating stations purified waters that recover the oil prepare nano combined displacement type fracturing fluid (the corresponding formula of Fig. 2
Fracturing fluid), after tested, nano combined displacement type fracturing fluid static state provided by the invention hang sand do not settle within 72 hours.
(5) colloidality energy is broken
Table 3 is the broken glue the performance test results of different nano combined displacement type fracturing fluids, and as shown in Table 3, the present invention provides
Nano combined displacement type fracturing liquid rubber-breaking have excellent performance.
Table 3 is the broken glue the performance test results of different nano combined displacement type fracturing fluids
(6) breaking glue solution surface and interface tension, contact angle
Measure 1.3%, 1.5% nanoemulsions thickening agent fracturing liquid rubber-breaking liquid surface and interface tension, observe its breaking glue solution drop with
Box8The contact angle of rock core, the results are shown in Table 4, and Fig. 7 and 8 is respectively connecing for 1.3%, 1.5% nanoemulsions thickening agent fracturing fluid
Feeler test chart, by table 4 and Fig. 7~8 it is found that nano combined displacement type fracturing fluid provided by the invention is with low surface and interface
Power is conducive to fracturing fluid discharge.
4 fracturing liquid rubber-breaking liquid surface and interface tension of table and contact angle
(7) breaking glue solution residue content
Table 5 is 1.5% nanoemulsions thickening agent fracturing fluid residue content data, and as shown in Table 5,1.5% nanoemulsions are thick
Agent fracturing fluid residue content is less than 200mg/L, lower than conventional guar gum fracturing fluid (400mg/L), reduces external solid phase to storage
The blocking of layer rock core pore throat and supporting crack.
51.5% nanoemulsions thickening agent fracturing fluid residue content data of table
| Sample number into spectrum | 1 | 2 | 3 |
| Residue content (mg/L) | 143 | 167 | 138 |
(8) core damage is evaluated
Clear water preparing fracturing fluid breaking glue solution is evaluated to the long injury situation for celebrating certain reservoir natural core, it is seen that nano-emulsion is hydraulic
Splitting liquid reduces core damage rate, average injury only 3.5%~4.5%, than guanidine gum fracturing fluid system (core damage rate 30%
More than) at least low 25%.Table 6~7 is respectively that the core damage of 1.3% and 1.5% nanoemulsions thickening agent fracturing fluid tests knot
Fruit.
Table 6 is the core damage experimental result of 1.3% nanoemulsions thickening agent fracturing fluid
Table 7 is the core damage experimental result of 1.5% nanoemulsions thickening agent fracturing fluid
(9) it is compared with guanidine gum fracturing fluid
Table 8 is the performance comparison of guanidine gum fracturing fluid and nano combined displacement type fracturing fluid, and as shown in Table 8, the present invention provides
Nano combined displacement type fracturing fluid property be substantially better than guanidine gum fracturing fluid.
The performance comparison of 8 guanidine gum fracturing fluid of table and nano combined displacement type fracturing fluid
(10) nanometer row drives agent washing oil Oil Displacing Capacity
Nanometer row drives agent agent whole process and injects with base fluid, while protecting oil reservoir, eliminates the stratum such as water lock, water-sensitive wound
Evil.Meanwhile with base fluid whole process inject, can the ground-to-ground comprehensive de-plugging of layer pore throat, cleaning very well, base fluid can be arrived by being equivalent to
The region reached carries out comprehensive combing, cleaning, de-plugging, and crude oil, grease on crack periphery crude oil, rock are cleaned up.Therefore,
While the good crack of formation is sketched the contours, the crack sketched the contours and micropore are shouted by the abundant de-plugging of inner crude oil by activating agent, and drive
For coming out, the percolation ability of pore throat is improved, the medicament into stratum carries out the de-plugging of depth crack to oil reservoir, changes wetability, promotees
Into crude oil flow.
Resume permeability experiment: 1.5% nanoemulsions thickening agent fracturing liquid rubber-breaking liquid of agent is driven to 0.6% nanometer of row of addition
It carries out resume permeability experiment: taking simulation core (permeability range: 10md~500md, content of mudstone 12~15%)；Forward direction is logical
2%KCl salt water surveys the permeability K of salt water1；At 70 DEG C, the logical 2pv crude oil (viscosity of crude 300mpas) of forward direction forms blocking；
The logical 2%KCl salt water 2pv of forward direction；Reversely have a thorough knowledge of bottom breaking glue solution solution 6pv, impregnates for 24 hours (70 DEG C of environment)；The logical 2%KCl salt of forward direction
Water surveys the permeability K of salt water after de-plugging2；Permeability resume figure is calculated, is shown in Table 9.
9 permeability resume figure result of table
| Core numbers | K0(md) | K1(md) | K2(md) | Permeability resume figure |
| 1 | 2.36 | 1.02 | 2.1 | 89.2% |
| 2 | 51.9 | 43.6 | 46.7 | 90.1% |
| 3 | 327.4 | 298.7 | 302.5 | 92.4% |
Washing oil oil displacement experiment:
After live crude oil and quartz sand are sufficiently mixed stirring, it is respectively put into water, in co-displacement liquid fracturing fluid breaking glue solution
Observe washing oil effect.It after breaking glue solution and oil-sand are mixed, separates crude oil from quartz sand surface, forms oil droplet shape or group
Shape floats, and sand grain surface cleans after separation, and oil-water interfaces are neat, illustrate that co-displacement fracturing fluid has preferable washing oil ability.
Co-displacement fracturing fluid, which removes, has preferable washing oil ability, itself does not influence also to be demulsified, and demulsification efficiency is up to 100%, if thinking, enhancing is broken
Newborn effect can also cooperate conventional demulsifier to use.
Site operation process
(1) continuous mixed construction technology
Fig. 9 is continuous mixed construction flow chart,
Figure 10 is nano combined displacement type fracturing fluid construction process schematic diagram, and Figure 11 is conventional guanidine gum fracturing fluid construction process
Schematic diagram, by Figure 10~11 it is found that nano combined displacement type fracturing fluid water source provided by the invention it is wide-salinity 300000mg/L
It inside may be used to nano combined displacement fracturing fluid construction, fracturing fluid property influences smaller；Not corrupt-will not be rotten because placing long
It loses, without adding fungicide；Without without remaining fracturing fluid, saving cost after residue-construction；Quickly and efficiently-without in advance with liquid or
Continuous mixing truck matches liquid, saves personnel, equipment, time.
(2) drain treatment for reuse process is returned
Figure 12 is that nano combined displacement type fracturing fluid reuses flow diagram, nano combined displacement provided by the invention
Type fracturing fluid recovery (backflow) liquid adds nanoemulsions thickening agent appropriate, can meet after the sedimentation of simple physics and mechanical purifying
Pressing crack construction requirement.
Two, effect of field application
Example 1: section is reduced, cluster spacing+nano combined displacement of reservoir oil fracturing fluid+whole process quartz sand high intensity adds sand
Song-liao basin Fuyu County densification oil-shortening section, cluster spacing increases and interferes between stitching, and forms complex fracture.
Song-liao basin Fuyu County densification pasta product: 10000km2
Oil reservoir buried depth: 1850~2600m
Core intersection: 2~10m (most thick 40m)
Well yield: 0.5~3t/d, highest 20t/d
Physical property: porosity 6%~10%, 0.01~1mD of permeability
Oil property: 0.8~0.86g/cm of density3, viscosity: 3~15mPas
Reservoir pressure coefficient: 0.97~1.06.
Figure 13 is Song-liao basin middle-shallow layer stratigraphic column, and Figure 14 is that configuration relation schematic diagram is stored up in Song-liao basin source.It is superior
Source storage configuration relation be the key that the fine and close oil in Fuyu County is formed, Fuyu Reservoirs are above to give birth to storage: source storage is close to hydrocarbon source rock: green one
The Hunan Duan Hu mud stone, reservoir: Quan-4 member delta sandbody.The compact reservoir of Song-liao basin Quan-4 member development large area is fine and close oily shape
At key, large area, overlap type (IV sand group of Quan-4 member I-), " basinful contain sand ", sandy ground is than 35~60%.
Test well: target zone Fuyu County (oil reservoir thickness 4.2m, porosity 13~16%, permeability 1mD), it is real to bore horizontal segment
2660m explains oil reservoir 1158.6m.
Using casing fracturing, speed bores bridge plug+temporary stifled segmentation Limited entry fracturing technique (11 section of 332 cluster of design), and it is multiple to squeeze into nanometer
Close displacement of reservoir oil lotion fracturing fluid (slippery water: linear glue=3:2) total amount 59608.0m3, be added laminated quartz sand 5084m3。
Daqing oil field Song-liao basin Fuyu County densification oil-shortening section, cluster spacing increases and interferes between stitching, and forms complex fracture.
Figure 15 is that production curve is sought in drain after pressing.
Example 2: nano combined displacement fracturing fluid Comparison study
The nano combined displacement fracturing fluid (the corresponding fracturing fluid of Fig. 2) of the present invention is used for 11 mouthfuls of wells of North China Oilfield field application
(old Jing7Kou, new Jing4Kou), construction success rate 100%.7 mouthfuls of old wells are gone into operation, and initial stage old well averagely increases day by day 6.9 tons oily after pressure, are put down
Equal individual well is accumulative to increase 5381 tons of oil.
Figure 16 is rock core CT scan displacement of reservoir oil inversion chart, and as shown in Figure 16, oil and water displacement process is obvious.
Example 3: peaceful 209H18-1 well returns drain application entirely
Geographical location: 4 groups of Sichuan Province, the town the Cao Ying village Long Sheng, Yibin City Gongxian County
Construction location: the construction southern wing in top difficult to understand in the arch structure of Changning
The platform is disposed 4 mouthfuls of water horizontal wells (the practical well of finishing drilling 1 and 4) altogether, lane spacing 400m, cabinet thickness 5.00m, is located at dragon one
12 substratum middle and lower parts and imperial one 11 substratums.
Figure 17 is peaceful 209H18 platform target area horizontal projection.
Quan Jingzhu pressing crack construction liquid 59943.1m3, average single hop liquid measure 2067.0m3；Wherein slippery water 1329.0m3, line
Property glue 719.7m3, acid solution 8.4m3, return sewerage 7.9m3, cosolvent 1.9m3。
Table 10 is peaceful 209H18-1 well pressure break liquid situation statistical form.
10 peaceful 209H18-1 well pressure break liquid situation statistical form of table
Figure 18 is peaceful 209H18-1 well single hop liquid measure statistical chart.
Peaceful 209H18-1 well construction section cluster 100% is completed by design requirement.
Peaceful 209H18-1 well sand amount coincidence rate 114.8%, average single hop sand amount is beyond design 21.7t.
Peaceful 209H18-1 well liquid amount 99.1%, average single hop liquid measure is less than design 19m3, reach design requirement.
Figure 19 is peaceful 209H18-1 well construction single hop sand feeding amount and comparison of design figure.
Peaceful 209H18-1 well is averaged operational discharge capacity in 12~14.5m3Between/min, average 13.6m3/min；
Average pump pressure is between 57.7~71.7MPa, average 66.8MPa；Termination of pumping pressure between 44.9~49.3MPa,
Average 46.7MPa.
Figure 20 is peaceful 209H18-1 well construction discharge capacity, pump pressure statistical chart.
Flour sand is added using slippery water slug formula, linear glue connection continues adding ceramic and adds sand intensity to improve.
Quan Jingyong returns drain with liquid, high salinity (about 23000PPM) ferric ion content, to the especially linear glue of fracturing fluid
The liquid salt tolerant Capability Requirement of resistance to iron ion is high.
It is provided in addition, the well returns drain by the multiple platforms of Changning block, drain complicated component multiplicity is returned, to the general of fracturing fluid
Adaptive also proposed challenge.
Figure 21 is each section of slippery water viscosity of peaceful 209H18-1 well and pH value field monitoring variation diagram.
Figure 22 is each section of peaceful 209H18-1 well linear adhesiveness and pH value field monitoring variation diagram.
Peaceful 209H18-1 well adds flour sand using slippery water slug formula, and linear glue connection continues adding ceramic and adds sand intensity to improve.
Slippery water drag reducing efficiency 76.9~84.9%, average 82.4%；Linear glue drag reducing efficiency 73.3~83.8%, it is average
79.3%.
The well fracturing fluid resistance reducing performance is good.
Figure 23 is each section of slippery water of peaceful 209H18-1 well, linear glue resistance-reducing yield variation diagram.
June 7,8 days the row of returning 70,110,160m3Shi Jinhang returns at 3 scenes drain sample detection, capillary viscosity measurement
Measuring result is 1.28,1.25,1.27mPas, average 1.27mPas.
Far below the upper limit 5mPas of the Industry code requirements of fracturing liquid rubber-breaking, the viscosity than conventional slippery water is also low, says
Open-wire line glue breaks glue and works well, and is especially advantageous for fracturing fluid mining after pressure.
Example 4: shorten cluster spacing+temporary stifled more cluster+gas well displacement fracturing fluids of pressure (returning drain with liquid)
To verify this technology effect on gas well, Jilin Oil Field managerial decision tries out the skill in wells such as morals deep 80,83 simultaneously
Art and routine techniques comparative test, the results show that 4 times of output increased.
Pound sign: moral deep 80
Well is other: prospect pit/straight well
Geographical location: the township Tong Tai, Dehui City, Jilin Province luckiness village south 392m
Construction location: the hollow slot of Dehui Rift Bao man
Target zone: 2272.50~4196.50 meters of city group well section of battalion, 1924.0 meters of thickness
Lithology: grey packsand containing gravel-grey packsand-light gray tufaceous packsand-grey siltstone
Carbonatite content 2%~15%, shale content 20%~25%
Reservoir pressure coefficient: 0.95~0.99
Formation temperature: 3.94 DEG C/100m
Clossing pressure gradient: 0.0175MPa/m
Figure 24 is frequency and permeability relational graph, and Figure 25 is frequency and porosity relational graph.
Figure 26 is the deep 80 log analysis data curve graphs of moral, and well log interpretation achievement shows that this well reservoir layer position is predominantly located at battalion
City group and Shahe subgroup, 2581.88~4200.70m explain 9 layers of gas-bearing formation, thick 52.14m, 55 layers, thick 165.2m of poor gas-bearing formation, store up
Layer span is big, needs layer and section pressure break.
Figure 27 is the deep 80 well logging total hydrocarbon peak curve of moral, it is known that, brittle mineral composition is high, and reservoir brittleness index is high, gas-bearing formation
Brittleness index has the geological conditions for preferably forming complicated seam, determines " huge discharge+slippery water+frozen glue " 80% or more
Volume fracturing thinking；Gas surveys display height, and reservoir gas-bearing property is preferable, and gas well is selected to carry out displacement pressure break with displacement fracturing fluid.
The above is only a preferred embodiment of the present invention, it is not intended to limit the present invention in any form.It should
It points out, for those skilled in the art, without departing from the principle of the present invention, if can also make
Dry improvements and modifications, these modifications and embellishments should also be considered as the scope of protection of the present invention.
Claims (9)
1. a kind of nano combined displacement type fracturing fluid, which is characterized in that 100 parts of nano combined displacement type fracturing fluids include with
The component of lower mass fraction: 0.25~0.5 part of chaotropic agent, 1~1.6 part of 12~20nm grades of lotion thickening agent, 0.4~0.8 part of friendship
Join agent, 0.2~0.25 part of nanometer row drives the liquid water of agent and surplus, and it is that 10nm grades of multicomponent synthesis add that the nanometer row, which drives agent,
Add agent, the nanometer row drive agent by include organic solvent, surfactant, multicomponent organic acid, strong oxidizer, corrosion inhibiter, iron from
Sub- stabilizer, clay stabilizer, chelating agent and suppression slag agent chemical synthesis.
2. nano combined displacement type fracturing fluid according to claim 1, which is characterized in that 100 parts of nano combined drives
It further include 0.8 part of delayed cross-linking additive for type fracturing fluid.
3. nano combined displacement type fracturing fluid according to claim 2, which is characterized in that the delayed cross-linking additive is
The anti-bleeding agent of polyhydroxy aldehyde, LB-2, polyalcohol or soda ash.
4. nano combined displacement type fracturing fluid according to claim 1, which is characterized in that the chaotropic agent is acetamide.
5. nano combined displacement type fracturing fluid according to claim 1, which is characterized in that the 12~20nm grades of emulsion thick
Agent is by 2- acrylamide-2-methyl propane sulfonic, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, acrylic acid, octadecyl third
Olefin(e) acid ester and acrylamide in molar ratio 3:1.8:1.5:1.2:2.5 in 500 DEG C of high temperature polymerization 36h resulting polymers through refining
It emulsifies and obtains.
6. nano combined displacement type fracturing fluid according to claim 1, which is characterized in that the crosslinking agent be organic boron or
Organic zirconium.
7. nano combined displacement type fracturing fluid according to claim 1, which is characterized in that the liquid water includes that pressure break is returned
Drain, Halite water, purification sewage or stratum output water.
8. nano combined displacement type fracturing fluid according to claim 7, which is characterized in that contain in the fracturing outlet liquid
Oil.
9. nano combined displacement type fracturing fluid according to claim 7, which is characterized in that include magnesium in the Halite water
One of ion, calcium ion and potassium ion are a variety of.
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