CN107201221A - A kind of CO2The method that dry method pressure break functional material coats proppant - Google Patents
A kind of CO2The method that dry method pressure break functional material coats proppant Download PDFInfo
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- CN107201221A CN107201221A CN201710383374.XA CN201710383374A CN107201221A CN 107201221 A CN107201221 A CN 107201221A CN 201710383374 A CN201710383374 A CN 201710383374A CN 107201221 A CN107201221 A CN 107201221A
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- proppant
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- haydite
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- C—CHEMISTRY; METALLURGY
- 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
- C09K8/80—Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open
- C09K8/805—Coated proppants
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Abstract
The invention discloses a kind of CO2The method that dry method pressure break functional material coats proppant, including following implementation steps：1) by the surface clean of haydite or quartz sand proppant, drying for standby；2) surface of haydite or quartz sand proppant is handled using silane coupler；3) by liquid CO2Thickening agent functional material is coated on through step 2) processing after haydite or quartz sand proppant surface, drying for standby.It is coated on the thickening agent functional material and actual liquid CO of proppant surface2In thickening agent it is consistent, molecular structure similar compatibility, so as to improve proppant itself suspension；The present invention compensate for current CO2Liquid CO will be passed through in the deficiency of dry method fracturing fluid prop-carrying capacity, actual fracturing process2The proppant and fibrous material of thickening agent functional material cladding are fitted into closed mixing sand tank, are acted synergistically using thickening agent and fiber, lifting liquid CO2Sand carrying effect, lifting construction scale ensures fracturing effect.
Description
Technical field
The invention belongs to oil fracturing technical field, and in particular to a kind of CO2Dry method pressure break functional material coats proppant
Method.
Background technology
CO2Dry method fracturing technique uses 100% liquid CO2As pressure break medium, proppant pressurization is cooled into liquid first
CO2Pressure of storage tank and temperature, with liquid CO in special puddle mixer2Mixing, is then pumped into pit shaft with high pressure fracture pump and is pressed
Split.CO2The subject matter that dry method pressure break faces is liquid CO under the conditions of pressing crack construction2Viscosity is only 0.02~0.16mPas, is hanged
Sand ability, filter loss is big, is unfavorable for pressure break and makes seam, even results in construction failure.There is researcher to propose by improving liquid CO2
Rate of pumping improve its outstanding sand ability, however, the friction that flow velocity will be greatly increased in work progress is improved, so as to carry
The high resistance to pressure request to construction equipment, increases potential safety hazard；In addition, liquid CO2Into after crack, its flow velocity will significantly drop
Low, turbulent phenomenon disappears in crack, and prop-carrying capacity drastically declines, causes to form sand plug in nearly well crack, causes construction to lose
Lose.
Another method is to improve liquid CO using thickener2Viscosity, however, liquid CO2It is a kind of non-polar solven,
Only well dissolved each other with Nonpolar Solute, there is no bonding force between solute molecule, thus carry glutinous very difficult.Researcher successively surveys
The multiple polymers such as styrene-fiuorinated acrylic copolymer, fluorination AOT derivatives, 12- hydroxy stearic acids have been tried to liquid CO2
Viscosity modified effect, only styrene-fiuorinated acrylic copolymer in the case of dosage 5% by CO2Carry glutinous more than 100 times,
But its cost is high, viscosity modified effect is poor.Chinese Petroleum Univ.'s fracture acidizing laboratory have developed a kind of higher aliphatic
Acid esters is used as liquid CO2Thickener, the thickener, can be by liquid CO under the conditions of dosage 0.25%~2.50%2Carry glutinous 17~
184 times, substantially increase increasing stick efficiency.At present, the thickener has been successfully applied to Ordos Basin Changqing Gas Fields Soviet Union and Eastern Europe xx
Well liquid state CO2Pressing crack construction scene, uses liquid CO after the thickener2Outstanding sand is functional and meets live pressing crack construction requirement.
Biodegradable fiber is added into fracturing fluid can also increase liquid CO on a small quantity2Outstanding sand ability, reduce frictional resistance, in addition, research and development it is new
Super-low-density proppant is also the practical way for lifting sand carrying effect.The low-density ceramic proppant density applied at this stage is less than
1.45g/cm3, will meet CO2Dry method pressure break demand should further reduce the density of proppant to 1.0~1.3g/cm3。
Although there is the above to improve CO2The multiple technologies of dry method pressure break sand carrying effect, but from the point of view of effect of field application, liquid
CO2Sand carrying effect can not still meet pressure break demand, current CO2Dry method fracturing sand feeding amount is still less than 15 sides, much smaller than conventional hydraulic pressure
Split, although obtain certain fracturing effect, but still have greater room for improvement.Meanwhile, densification oil gas, shale oil gas etc. are unconventional at present
Petroleum resources is the Main way that the energy is taken over, and such reservoir needs to implement fairly large, discharge capacity volume fracturing, due to CO2
Dry method pressing crack construction dimension-limited, this has turned into restriction CO2The technical bottleneck that dry method pressure break is widely applied in the field.
The content of the invention
The main object of the present invention is to be directed to current liquid CO2Thickening puies forward viscous difficulty, and sand carrying effect can not meet pressure break need
Ask, cause scope of construction item too small, the problems such as fracturing effect is difficult to ensure, in order to make up current CO2Dry method fracturing fluid prop-carrying capacity
Deficiency, further improve liquid CO2Sand carrying effect, lifts CO2Dry method pressure break scale, ensures fracturing effect, the invention provides
A kind of method that CO2 dry method pressure break functional material coats proppant.
The present invention is according to some molecular material property similar compatibilities, and property is complementary, and mutually there is provided one kind for modified mechanism
CO2The method that dry method pressure break functional material coats proppant, including following implementation steps：
1) haydite or quartz sand proppant are chosen according to hole condition, fracturing technology, and by haydite or the table of quartz sand proppant
Face cleaning, drying for standby；
2) surface of haydite or quartz sand proppant is handled using silane coupler；
3) by liquid CO2Thickening agent functional material is coated on haydite or quartz sand support of the surface after coupling agent treatment
Agent surface, drying for standby.
Described step 2) the middle method handled using silane coupler the surface of haydite or quartz sand proppant
For the mode sprayed or mixed, described spray pattern is referred specifically to the uniform sprayed coating of silane coupler in haydite or quartz sand
The surface of proppant；The mode of described mixing refers specifically to successively add haydite or quartz sand support in auger tank
Agent and silane coupler, are kept stirring for tank temperature at 50-100 degrees Celsius, are uniformly mixed rear drying for standby.
The mass percent of silane coupler and haydite or quartz sand proppant in described addition auger tank is
(0.1-1):100。
Described step 3) by liquid CO2Thickening agent functional material be coated on haydite of the surface after coupling agent treatment or
The method of quartz sand proppant surface is spraying or the mode mixed, and described spray pattern is referred specifically to liquid CO2It is thick
Haydite or the surface of quartz sand proppant that the uniform sprayed coating of agent functional material is handled in surface by silane coupler；Described
The mode of mixing refers specifically to successively add haydite or quartz sand proppant and liquid CO in auger tank2Thickening agent work(
Energy material, is kept stirring for tank temperature at 50-100 degrees Celsius, is uniformly mixed rear drying for standby.
Described liquid CO2Thickening agent functional material is fatty glyceride, styrene-fiuorinated acrylic copolymer, fluorine
Change one kind in AOT derivatives or 12- hydroxy stearic acids etc..
The molecular weight of described styrene-fiuorinated acrylic copolymer is 1,000,000~10,000,000.
Described step 1) particle diameter of haydite or quartz sand proppant is 20/40 mesh, 40/70 mesh.
Described step 2) silane coupler is a class having containing two kinds of different chemical property groups simultaneously in the molecule
Organic silicon compound, its chemical general formula is YSiX3, in formula, Y is non-hydrolytic group, including alkenyl and end carry Cl, NH2、
SH, epoxy, N3, (methyl) acryloxy, the alkyl of the functional group such as NCO, i.e. carbon functional group；X is hydrolyzable base
Group, including Cl, Ome, Oet, OC2H4OCH3、OSiMe3And OAc etc..
The present invention technique effect be：
1st, proppant surface Modified lift liquid CO is utilized2The covered effect of thickening agent functional material, surface is by processing
Proppant be more easy to be combined with organic molecule, by liquid CO2Thickening agent functional material takes spraying or the mode bag mixed
Overlay on the treated proppant surface in surface；The thickening agent functional material for being coated on proppant surface will be with actual liquid CO2
In thickening agent it is consistent, be fatty glyceride, styrene-fiuorinated acrylic copolymer, fluorination AOT derivatives or 12- hydroxyls
Base stearic acid etc., to ensure the thickening agent and liquid CO of proppant surface cladding in fracturing process2In thickening agent similar compatibility,
So as to improve proppant itself suspension.
2nd, according to liquid CO2Or supercritical CO2Property, uses liquid CO2Thickening agent functional material is carried out to proppant surface
Cladding processing, can be provided simultaneously with surface and is modified reduction frictional resistance function, make up at present with the preferable compatibility of carbon dioxide pressure break liquid
CO2Liquid CO will be passed through in the deficiency of dry method fracturing fluid prop-carrying capacity, actual fracturing process2The branch of thickening agent functional material cladding
Support agent and surface modified fibre material are fitted into closed mixing sand tank, are acted synergistically using thickening agent and fiber, lifting liquid CO2Take
Sand effect, lifts CO2Dry method pressing crack construction scale, ensures fracturing effect.
Embodiment
Embodiment 1
A kind of CO2The method that dry method pressure break functional material coats proppant, including following implementation steps：
1) haydite or quartz sand proppant are chosen according to hole condition, fracturing technology, and by haydite or the table of quartz sand proppant
Face cleaning, drying for standby；
2) surface of haydite or quartz sand proppant is handled using silane coupler；
3) by liquid CO2Thickening agent functional material is coated on haydite or quartz sand support of the surface after coupling agent treatment
Agent surface, drying for standby.
Liquid CO2It is a kind of non-polar solven, only well dissolves each other, be not bonded between solute molecule with Nonpolar Solute
Power, thus carry glutinous very difficult, it is main at present using high-grade aliphatic ester, styrene-fiuorinated acrylic copolymer, fluorination AOT
Derivative, 12- hydroxy stearic acids etc. are used as liquid CO2Thickening agent carry out viscosity modified, but viscosity modified effect is poor, of the invention
According to liquid CO2Or supercritical CO2Property, is spread out using fatty glyceride, styrene-fiuorinated acrylic copolymer, fluorination AOT
The liquid CO such as biological or 12- hydroxy stearic acids2Thickening agent functional material carries out cladding processing to proppant surface, to ensure pressure break
During proppant surface coat liquid CO2Thickening agent functional material and liquid CO2In thickening agent similar compatibility, so as to carry
Itself suspension of high proppant, substantially increases increasing stick efficiency；It is provided simultaneously with surface and is modified reduction frictional resistance function, makes up at present
CO2Liquid CO will be passed through in the deficiency of dry method fracturing fluid prop-carrying capacity, actual fracturing process2The branch of thickening agent functional material cladding
Support agent and surface modified fibre material are fitted into closed mixing sand tank, are acted synergistically using thickening agent and fiber, lifting liquid CO2Take
Sand effect, lifts CO2Dry method pressing crack construction scale, ensures fracturing effect.
Embodiment 2
On the basis of embodiment 1, the particle diameter of described ceramsite propping agent is 20/40 mesh, 40/70 mesh, its selection gist
Professional standard SY/T 6302-1997《Method is recommended in the short-term flow conductivity evaluation of fracturing propping agents filling bed》.
Coupling agent is typically made up of two parts：A part is close inorganic group, can be made with inorganic filler or reinforcing material
With；Another part is organic-philic group.It is divided into organochromium complexes, silanes, metatitanic acid by the chemical constitution and composition of coupling agent
Esters and the major class of aluminic acid compound four, wherein silane coupler are a classes in the molecule simultaneously containing two kinds of different chemical property bases
The organo-silicon compound of group, its chemical general formula is YSiX3, in formula, and Y is non-hydrolytic group, including alkenyl and end are carried
The alkyl of the functional groups such as Cl, NH2, SH, epoxy, N3, (methyl) acryloxy, NCO, i.e. carbon functional group；X is can
Hydrolysising group, including Cl, Ome, Oet, OC2H4OCH3, OSiMe3 and OAc etc., due to this special construction, in the molecule thereof together
When have can and inanimate matter material (such as glass, silica sand, metal) chemically combined reactive group and with organic material (synthesize
Resin etc.) chemically combined reactive group, it can be used for surface treatment.
The present invention is realized by following technical measures：A kind of CO2The method that dry method pressure break functional material coats proppant, bag
Include：
Step 1), according to specific well choose particle diameter be 20/40 mesh, the haydite of 40/70 mesh or quartz sand proppant, and will pottery
Grain or the cleaning of quartz sand proppant surface, drying for standby；
Step 2), by silane coupler even spraying proppant surface, or successively add in auger tank haydite or
The mass percent of quartz sand proppant and silane coupler, haydite or quartz sand proppant and silane coupler is (0.1-1):
100, tank temperature is kept stirring at 50-100 degrees Celsius, is uniformly mixed rear drying for standby；
Step 3), the treated proppant in surface be more easy to be combined with organic molecule, take spraying or mix side
Formula, by liquid CO2Thickening agent functional material is coated on haydite or quartz sand proppant of the surface after silane coupler is handled
Surface, drying for standby.
Described liquid CO2Thickening agent functional material and actual liquid CO2In thickening agent it is consistent, generally higher aliphatic
Acid esters, styrene-fiuorinated acrylic copolymer, fluorination AOT derivatives or 12- hydroxy stearic acids etc., to ensure in fracturing process
The thickening agent and liquid CO of proppant surface cladding2In thickening agent similar compatibility, so as to improve the suspension of proppant itself.
Embodiment 3
On the basis of above-described embodiment, the invention provides a kind of CO2Dry method pressure break functional material cladding proppant
Method, including：
Step 1), the ceramsite propping agent that particle diameter is 20/40 mesh is chosen, and by ceramsite propping agent surface clean, drying for standby；
Step 2), by silane coupler even spraying in haydite or quartz sand proppant surface；
Step 3), by the uniform sprayed coating of fatty glyceride in by step 2) processing after ceramsite propping agent surface, do
It is dry standby.
Embodiment 4
On the basis of above-described embodiment, the invention provides a kind of CO2Dry method pressure break functional material cladding proppant
Method, including：
Step 1), choose quartz sand proppant, and by quartz sand proppant surface cleaning, drying for standby；
Step 2), successively add quartz sand proppant and silane coupler in auger tank, quartz sand proppant and
The mass percent that coupling agent is added is 1:100, tank temperature is kept stirring at 50-100 degrees Celsius, is dried after being uniformly mixed
It is standby；
Step 3), by molecular weight for 1,000,000 the uniform sprayed coating of styrene-fiuorinated acrylic copolymer in pass through step 2) place
The surface of quartz sand proppant after reason, drying for standby.
Embodiment 5
On the basis of above-described embodiment, on the basis of above-described embodiment, the invention provides a kind of CO2Dry method pressure break
The method that functional material coats proppant, including：
Step 1), the ceramsite propping agent that particle diameter is 20/40 mesh is chosen, and by ceramsite propping agent surface clean, drying for standby；
Step 2), ceramsite propping agent and silane coupler, ceramsite propping agent and silane are successively added in auger tank
The mass percent that coupling agent is added is 0.1:100, tank temperature is kept stirring at 50-100 degrees Celsius, is done after being uniformly mixed
It is dry standby；
Step 3), in auger tank successively add by step 2) handle after ceramsite propping agent and 12- hydroxyls it is hard
Resin acid, is kept stirring for tank temperature at 50-100 degrees Celsius, is uniformly mixed rear drying for standby.
Embodiment 6
On the basis of above-described embodiment, on the basis of above-described embodiment, the invention provides a kind of CO2Dry method pressure break
The method that functional material coats proppant, including：
Step 1), the ceramsite propping agent that particle diameter is 40/70 mesh is chosen, and by ceramsite propping agent surface clean, drying for standby；
Step 2), by silane coupler even spraying in ceramsite propping agent surface；
Step 3), in auger tank successively add by step 2) processing after ceramsite propping agent and be fluorinated AOT spread out
Biology, is kept stirring for tank temperature at 50-100 degrees Celsius, is uniformly mixed rear drying for standby.
Above-described embodiment is only presently preferred embodiments of the present invention, and not the present invention is imposed any restrictions, every according to this hair
Any simple modification, change and equivalent structure change that bright technical spirit is made to following examples, still fall within the present invention
In the protection domain of technical scheme.
Claims (8)
1. a kind of CO2The method that dry method pressure break functional material coats proppant, it is characterised in that including following implementation steps：
1) haydite or quartz sand proppant are chosen according to hole condition, fracturing technology, and the surface of haydite or quartz sand proppant is clear
Wash, drying for standby；
2) surface of haydite or quartz sand proppant is handled using silane coupler；
3) by liquid CO2Thickening agent functional material is coated on haydite or quartz sand proppant table of the surface after coupling agent treatment
Face, drying for standby.
2. a kind of CO according to claim 12The method that dry method pressure break functional material coats proppant, it is characterised in that：Institute
The step 2 stated) the middle method handled using silane coupler the surface of haydite or quartz sand proppant is spraying or mixes
The mode of stirring is closed, described spray pattern is referred specifically to the uniform sprayed coating of silane coupler in haydite or the table of quartz sand proppant
Face；The mode of described mixing refers specifically to successively add haydite or quartz sand proppant in auger tank and silane is even
Join agent, be kept stirring for tank temperature at 50-100 degrees Celsius, be uniformly mixed rear drying for standby.
3. a kind of CO according to claim 32The method that dry method pressure break functional material coats proppant, it is characterised in that：Institute
The silane coupler added in auger tank and the mass percent of haydite or quartz sand proppant stated are (0.1-1):
100。
4. a kind of CO according to claim 12The method that dry method pressure break functional material coats proppant, it is characterised in that：Institute
The step 3 stated) by liquid CO2Thickening agent functional material is coated on haydite or quartz sand support of the surface after coupling agent treatment
The method on agent surface is spraying or the mode mixed, and described spray pattern is referred specifically to liquid CO2Thickening agent function material
Expect that the haydite of silane coupler processing or the surface of quartz sand proppant are passed through in uniform sprayed coating in surface；Described mixing
Mode refers specifically to successively add haydite or quartz sand proppant and liquid CO in auger tank2Thickening agent functional material, is protected
Agitator tank temperature is held at 50-100 degrees Celsius, rear drying for standby is uniformly mixed.
5. a kind of CO according to claim 12The method that dry method pressure break functional material coats proppant, it is characterised in that：Institute
The liquid CO stated2Thickening agent functional material is fatty glyceride, styrene-fiuorinated acrylic copolymer, fluorination AOT derivatives
Or one kind in 12- hydroxy stearic acids.
6. a kind of CO according to claim 52The method that dry method pressure break functional material coats proppant, it is characterised in that：Institute
The molecular weight for the styrene-fiuorinated acrylic copolymer stated is 1,000,000~10,000,000.
7. a kind of CO according to claim 12The method that dry method pressure break functional material coats proppant, it is characterised in that：Institute
The step 1 stated) particle diameter of haydite or quartz sand proppant is 20/40 mesh, 40/70 mesh.
8. a kind of CO according to claim 12The method that dry method pressure break functional material coats proppant, it is characterised in that：Institute
The step 2 stated) silane coupler is organo-silicon compound of the class in the molecule simultaneously containing two kinds of different chemical property groups,
Its chemical general formula is YSiX3, in formula, Y is non-hydrolytic group, including alkenyl and end carry Cl, NH2, SH, epoxy, N3、
(methyl) acryloxy, the alkyl of NCO, i.e. carbon functional group；X is hydrolyzable groups, including Cl, Ome, Oet,
OC2H4OCH3、OSiMe3And OAc.
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| CN110291174A (en) * | 2017-02-13 | 2019-09-27 | 沙特阿拉伯石油公司 | Thickening proppant and its preparation and application for carbon dioxide-base fracturing fluid |
| CN111040753A (en) * | 2019-10-28 | 2020-04-21 | 中国石油化工股份有限公司 | Supercritical CO2Hydrophobic modification method of fracturing fluid proppant |
| CN112680209A (en) * | 2019-10-17 | 2021-04-20 | 中国石油化工股份有限公司 | Proppant and preparation method thereof |
| CN112680205A (en) * | 2019-10-17 | 2021-04-20 | 中国石油化工股份有限公司 | Surfactant oil displacement system and preparation method thereof |
| CN115851254A (en) * | 2022-12-31 | 2023-03-28 | 西南石油大学 | Double-hydrophobic modified quartz sand proppant and preparation method thereof |
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| CN112680209A (en) * | 2019-10-17 | 2021-04-20 | 中国石油化工股份有限公司 | Proppant and preparation method thereof |
| CN112680205A (en) * | 2019-10-17 | 2021-04-20 | 中国石油化工股份有限公司 | Surfactant oil displacement system and preparation method thereof |
| CN112680209B (en) * | 2019-10-17 | 2022-12-09 | 中国石油化工股份有限公司 | Proppant and preparation method thereof |
| CN111040753A (en) * | 2019-10-28 | 2020-04-21 | 中国石油化工股份有限公司 | Supercritical CO2Hydrophobic modification method of fracturing fluid proppant |
| CN111040753B (en) * | 2019-10-28 | 2022-04-19 | 中国石油化工股份有限公司 | Supercritical CO2Hydrophobic modification method of fracturing fluid proppant |
| CN115851254A (en) * | 2022-12-31 | 2023-03-28 | 西南石油大学 | Double-hydrophobic modified quartz sand proppant and preparation method thereof |
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Application publication date: 20170926 |