CN107880868B - A kind of pressure break control water nanoemulsions and preparation method thereof - Google Patents
A kind of pressure break control water nanoemulsions and preparation method thereof Download PDFInfo
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Abstract
The present invention provides a kind of pressure break control water nanoemulsions and preparation method thereof.In tight gas wells fracturing process, pressure break control water nanoemulsions inject tight gas reservoir with fracturing fluid, pressure break control water has the adsorptivity of hydrophobicity and stabilization with nanoemulsions, blowhole surface is adsorbed on after into stratum, it is water-fastness to wash away, water phase permeability can be greatly lowered, reduction amplitude reaches 70% or more；Very little is influenced on gas phase permeability, there is selection to sexually revise the characteristic mutually oozed, control water is with obvious effects；Viscosity is small, and surface tension is low, easily injects, is particularly suitable for tight gas reservoir；Good with reservoir fluid compatibility, shear stability, thermal stability and salt-stable are good.In the case where influencing very little to gas phase permeability, the purpose of control water is realized.
Description
Technical field
The present invention relates to technical field of oilfield chemistry, in particular to a kind of pressure break control water nanoemulsions and its system
Preparation Method.
Background technology
Hypotonic tight gas reservoir is difficult to obtain industrial gas, the hypotonic tight gas of High water cut before not carrying out the storey increase designs such as pressure break
Can the man-made fracture that well pressure break is formed easily leads to that gas well is aqueous to be risen fast, solve simultaneously after tight gas reservoir gas well fracturing containing waterborne
It rises soon with oil/gas well stimulation problem, this is that domestic and international gas field worker generally wants to solve the problems, such as.As tight gas reservoir reserves exist
Proportion in natural gas energy resource increases severely with day, and the exploitation of compact sandstone gas has become one of hot issue, thus domestic and international gas field
Worker also increases the research dynamics developed to tight gas reservoir.For tight gas wells, if pressure break efficiently control can be developed
Water material can control the output water brought by fracturing fracture, can not only improve gas well while carrying out pressure break to gas well
Yield increases economic benefit, but also the technology for being avoided that the subsequent environmental problem caused by a large amount of output waters and bringing is difficult
Topic.
Fracturing fluid with efficient control water function is one of the critical issue that tight gas wells implement control water fracturing methods, domestic
Outer associated mechanisms have been devoted to the research and application of tight gas reservoir control water fracturing technique.Currently, including mainly：Improved polymerization
Object crosslinking control water fracturing fluid system covers sand as the control of part proppant as fracturing fluid and using wax to meet the jelly system of water viscosity reduction
Water Fracturing Technology etc., such as CN101476452A (CN200910020940.6) disclose a kind of oil gas well control hydraulic pressure and split volume increase
Method is in such a way that chemical degradation cladding blocks, to form plugged zone in pressing crack construction in underground, chemically react weight
Proportioning is：20~40 parts of 1000 parts of water, paraffin or microwax, 180~360 parts of sand, 3~4 parts of thickening agent, crosslinking agent 7~9
Part, 0.29~6.6 part of additive.CN102120929A (CN201010609172.0) discloses a kind of preparation side of gas-well water controlling agent
Method, including：A, anionic polyacrylamide, cationic polymer and XY type univalent metal salt cosolvent aqueous solutions are mixed equal
Even, stirring forms polymer compositional solution to being completely dissolved；The anionic polyacrylamide molecular weight be 6,000,000~
20000000；Molecular weight 3,000,000~9,000,000 of the cationic polymer；B, by organic acid esters, carbonate and step a institutes shape
At polymer compositional solution according to (0.05~0.5)：(0.5~1)：100 mass ratioes compound, and obtain gas-well water controlling agent.
Existing control water fracturing fluid host agent is mostly high molecular weight polymers, and tight gas reservoir reservoir properties are poor, pore scale
For micro/nano level, and crosslinked polymer system or jelly system grain size is big, viscosity is big, thus be not suitable for being used as tight gas reservoir control
Water fracturing fluid.
Invention content
In view of this, the technical problem to be solved in the present invention is to overcome the deficiencies of existing technologies, a kind of pressure break is provided
Control water nanoemulsions.In pressure break control water nanoemulsions, by weight, including：
20~40 parts of oil phase,
10~30 parts of emulsifier,
1~20 part of assistant for emulsifying agent.
In some embodiments, by weight, the oil phase includes 20~40 parts of dialkyl polydimethylsiloxanes；
The molecular weight of the dialkyl polydimethylsiloxane is 3800~50000；Its hydroxy radical content is：6.0~
12.0%.
In some embodiments, by weight, the oil phase includes 25~35 parts of dialkyl polydimethylsiloxanes；
The molecular weight of the dialkyl polydimethylsiloxane is 16000~28000；Its hydroxy radical content is：8.0~
10.0%,
In some embodiments, by weight, the emulsifier include 15~20 parts of alkyl phenol polyoxyethylene ether and
The compound of polyoxyethylene carboxylate；The mass ratio of the alkyl phenol polyoxyethylene ether and the polyoxyethylene carboxylate
Ranging from：4:1~1:2.
In some embodiments, the alkyl phenol polyoxyethylene ether includes any one in NP-10, NP-12, NP-13
Kind or arbitrary several combination.
In some embodiments, the polyoxyethylene carboxylate includes OEO-103 and/or OEO-105.
In some embodiments, the alkyl phenol polyoxyethylene ether is NP-10；The polyoxyethylene carboxylate is
OEO-103；
The mass ratio range of the NP-10 and the OEO-103 is：5:2~5:3.
In some embodiments, the assistant for emulsifying agent includes arbitrary in normal propyl alcohol, n-butanol, n-propylamine, n-butylamine
It is a kind of or arbitrary several.
In some embodiments, by weight, the assistant for emulsifying agent includes 5 parts of normal propyl alcohols.
The preparation method of this kind of pressure break control water nanoemulsions, includes the following steps：Emulsifier, assistant for emulsifying agent are added to
In oil phase, 20~40min is stirred under room temperature, 100r/min；Then it under 20~80 DEG C, 200~800r/min stirrings, will go
Ionized water is uniformly instilled in 10~20min in the oil phase mixed, continues 30~60min of stirring, that is, is obtained pressure break control water and used
Nanoemulsions.
Beneficial effects of the present invention are as follows：
With the continuous decline of conventional gas and oil yield, the unconventionaloil pools such as hypotonic tight gas become the heat of exploration and development
Point, the hypotonic tight gas in China is resourceful, is concentrated mainly on the Main Basins such as Erdos, pine the Liao Dynasty, Sichuan and Tarim Basin, technology
Mining resources amount reaches 12 × 1013m3。
Hypotonic tight gas reservoir shows the features such as low-porosity, low-permeability, high-moisture, high capillary pressure.High water cut
Generally there is the problem that aqueous rising is fast, production decline is rapid after pressure break in hypotonic tight gas wells.Pressure break control provided by the invention
Water can effectively solve the contradiction of control water and pressure break with nanoemulsions.The output water that fracturing fracture is brought not only can be effectively controlled,
Gas well yield can also be improved, increases economic benefit, avoids the problem of a large amount of output water process.
In tight gas wells fracturing process, pressure break control water nanoemulsions inject tight gas reservoir, nanometer control water with fracturing fluid
Lotion have hydrophobicity, into stratum after be adsorbed on rock surface, water phase permeability can be greatly lowered, reduction amplitude reaches
70% or more；Very little is influenced on gas phase permeability, there is selection to sexually revise the characteristic mutually oozed, control water is with obvious effects；Viscosity is small, table
Face tension is low, easily injects, is particularly suitable for tight gas reservoir；It is good with reservoir fluid compatibility, shear stability, thermal stability and salt
It has good stability.While not influencing gas phase permeability, the purpose of control water is realized.
Generally, there are following technical advantages for pressure break control water nanoemulsions provided by the invention：
1. hydrophobicity, control water effect is high, and water phase permeability reduces amplitude and reaches 70% or more
2. surface tension is low
3. endurance of cutting and flushing resistance are good
4. temperature tolerance and good salt tolerance.
In conclusion the structure that pressure break control water nanoemulsions of the present invention are special, has the advantages that above-mentioned many and reality
With value, and it there are no similar method in similar product and publish or use and really belong to innovation, produce handy and real
The preparation method of effect, more existing control water material has effects that the multinomial of enhancement, to more be suitable for practicality, and has
Extensive industrial value.
Description of the drawings
It should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore it is not construed as to model
The restriction enclosed for those of ordinary skill in the art without creative efforts, can also be according to these
Attached drawing obtains other relevant attached drawings.
Fig. 1 is the electromicroscopic photograph of the embodiment of the present invention 1.
Specific implementation mode
Hereinafter, the disclosure is described more fully in embodiment.The disclosure can have various embodiments, and can be at it
In adjust and change.It should be understood, however, that：There is no the various embodiments of the disclosure are limited to particular implementation disclosed herein
The intention of example, but the disclosure should be interpreted as to covering all tune in the spirit and scope for the various embodiments for falling into the disclosure
Whole, equivalent and/or alternative.
Hereinafter, disclosed in the term " comprising " that can be used in the various embodiments of the disclosure or " may include " instruction
Function, operation or the presence of element, and do not limit the increase of one or more functions, operation or element.In addition, such as existing
Used in the various embodiments of the disclosure, term " comprising ", " having " and its cognate are meant only to indicate special characteristic, number
Word, step, operation, the combination of element, component or aforementioned item, and be understood not to exclude first one or more other
Feature, number, step, operation, the combination of element, component or aforementioned item presence or increase one or more features, number,
Step, the possibility of operation, the combination of element, component or aforementioned item.
In the various embodiments of the disclosure, it includes listing file names with to state "or" or " at least one of A or/and B "
Any combinations of word or all combinations.For example, statement " A or B " or " at least one of A or/and B " may include A, may include
B may include A and B both.
The statement (" first ", " second " etc.) used in the various embodiments of the disclosure can be modified in various implementations
Various constituent element in example, but respective sets can not be limited into element.For example, presented above be not intended to limit the suitable of the element
Sequence and/or importance.The purpose presented above for being only used for differentiating an element and other elements.For example, the first user fills
It sets and indicates different user device with second user device, although the two is all user apparatus.For example, not departing from each of the disclosure
In the case of the range of kind embodiment, first element is referred to alternatively as second element, and similarly, second element is also referred to as first
Element.
It should be noted that：It, can be by the first composition member if a constituent element ' attach ' to another constituent element by description
Part is directly connected to the second constituent element, and " connection " third can be formed between the first constituent element and the second constituent element
Element.On the contrary, when a constituent element " being directly connected to " is arrived another constituent element, it will be appreciated that in the first constituent element
And second third constituent element is not present between constituent element.
The term used in the various embodiments of the disclosure is used only for the purpose of describing specific embodiments and not anticipates
In the various embodiments of the limitation disclosure.As used herein, singulative is intended to also include plural form, unless context is clear
Chu it is indicated otherwise.Unless otherwise defined, otherwise all terms (including technical terms and scientific terms) used herein have
There is meaning identical with the various normally understood meanings of embodiment one skilled in the art of the disclosure.The term
(term such as limited in the dictionary generally used) is to be interpreted as having and situational meaning in the related technical field
Identical meaning and the meaning that Utopian meaning or too formal will be interpreted as having, unless in the various of the disclosure
It is clearly defined in embodiment.
The present invention provides pressure break control water nanoemulsions, by weight, including：
20~40 parts of oil phase,
10~30 parts of emulsifier,
1~20 part of assistant for emulsifying agent,
20~80 parts of deionized water.
In tight gas wells fracturing process, pressure break control water nanoemulsions provided by the invention inject tight gas with fracturing fluid
Hide, pressure break control water with nanoemulsions have hydrophobicity and strong adsorptivity, into stratum after be adsorbed on rock surface, can significantly drop
Low water phase permeability, reduction amplitude reach 70% or more；Very little is influenced on gas phase permeability, there is selection to sexually revise the spy mutually oozed
Property, control water is with obvious effects；Viscosity is small, and surface tension is low, easily injects, is particularly suitable for tight gas reservoir；With reservoir fluid compatibility
Good, shear stability, thermal stability and salt-stable are good.While not influencing gas phase permeability, the mesh of control water is realized
's.
In some embodiments of the invention, by weight, the oil phase includes 20~40 parts of dihydroxy polydimethyl silicon
Oxygen alkane；
The molecular weight of the dialkyl polydimethylsiloxane is 3800~50000；Its hydroxy radical content is：6.0~
12.0%.
In some embodiments of the invention, by weight, the oil phase includes 25~35 parts of dihydroxy polydimethyl silicon
Oxygen alkane；
The molecular weight of the dialkyl polydimethylsiloxane is 16000~28000；Its hydroxy radical content is：8.0~
10.0%,
In some embodiments of the invention, by weight, the emulsifier includes 15~20 parts of alkylphenol-polyethenoxies
The compound of ether and polyoxyethylene carboxylate；The quality of the alkyl phenol polyoxyethylene ether and the polyoxyethylene carboxylate
Proportional region is：4:1~1:2.
In some embodiments of the invention, the alkyl phenol polyoxyethylene ether includes appointing in NP-10, NP-12, NP-13
It anticipates a kind of or arbitrary several combination.
In some embodiments of the invention, the polyoxyethylene carboxylate includes OEO-103 and/or OEO-105.
In some embodiments of the invention, the alkyl phenol polyoxyethylene ether is NP-10；The polyoxyethylene carboxylate
For OEO-103；
The mass ratio range of the NP-10 and the OEO-103 is：5:2~5:3.
In some embodiments of the invention, the assistant for emulsifying agent includes in normal propyl alcohol, n-butanol, n-propylamine, n-butylamine
Any one is arbitrary several.
In some embodiments of the invention, by weight, the assistant for emulsifying agent includes 5 parts of normal propyl alcohols.
The present invention also provides the preparation methods of this kind of pressure break control water nanoemulsions, include the following steps：By emulsifier,
Assistant for emulsifying agent is added in oil phase, and 20~40min is stirred under room temperature, 100r/min；Then at 20~80 DEG C, 200~800r/
Under min stirrings, deionized water is uniformly instilled in the oil phase mixed in 10~20min, continue 30~60min of stirring, i.e.,
Obtain pressure break control water nanoemulsions.
Embodiment 1
At room temperature, the 20.0g dialkyl polydimethylsiloxanes, hydroxy radical content is taken to be：8.0%, molecular weight 16000 will
5.0g alkyl phenol polyoxyethylene ether NP-10,2.0g polyoxyethylene carboxylate OEO-103,5.0g normal propyl alcohol is added to dihydroxy
In dimethyl silicone polymer, 30min is stirred under 100r/min, then at 50 DEG C, under 400r/min stirrings, by 33.0g go from
Sub- water uniformly instills in oil phase in 15min, obtains transparent uniform liquid, as pressure break control water nanoemulsions.
Embodiment 2
At room temperature, the 20.0g dialkyl polydimethylsiloxanes, hydroxy radical content is taken to be：12.0%, molecular weight 50000 will
6.2g alkyl phenol polyoxyethylene ether NP-10,3.0g polyoxyethylene carboxylate OEO-103,6.0g n-butanol is added to dihydroxy
In dimethyl silicone polymer, 30min is stirred under 100r/min, then at 80 DEG C, under 800r/min stirrings, by 40.0g go from
Sub- water uniformly instills in oil phase in 15min, obtains transparent uniform liquid, as pressure break control water nanoemulsions.
Embodiment 3
At room temperature, the 20.0g dialkyl polydimethylsiloxanes, hydroxy radical content is taken to be：8.0%, molecular weight 50000 will
4.0g alkyl phenol polyoxyethylene ether NP-12,4.0g polyoxyethylene carboxylate OEO-103,3.0g n-propylamine is added to dihydroxy
In dimethyl silicone polymer, 25min is stirred under 100r/min, then at 40 DEG C, under 500r/min stirrings, by 35.0g go from
Sub- water uniformly instills in oil phase in 20min, obtains transparent uniform liquid, as pressure break control water nanoemulsions.
Embodiment 4
At room temperature, the 20.0g dialkyl polydimethylsiloxanes, hydroxy radical content is taken to be：10.0%, molecular weight 16000 will
2.0g alkyl phenol polyoxyethylene ether NP-10,2.0g alkyl phenol polyoxyethylene ether NP-12,3.3g polyoxyethylene carboxylate OEO-
103,2.0g normal propyl alcohols, 3.0 n-propylamines are added in dialkyl polydimethylsiloxane, 20min are stirred under 100r/min, so
Afterwards under 30 DEG C, 300r/min stirrings, 28.0g deionized waters are uniformly instilled in oil phase in 10min, are obtained transparent uniform
Liquid, as pressure break control water nanoemulsions.
Embodiment 5
At room temperature, the 20.0g dialkyl polydimethylsiloxanes, hydroxy radical content is taken to be：12.0%, molecular weight 35000 will
2.0g alkyl phenol polyoxyethylene ether NP-12,1.0g alkyl phenol polyoxyethylene ether NP-13,3.0g polyoxyethylene carboxylate OEO-
103,2.0g normal propyl alcohols, 2.0 n-butylamines are added in dialkyl polydimethylsiloxane, 35min are stirred under 100r/min, so
Afterwards under 60 DEG C, 300r/min stirrings, 31.0g deionized waters are uniformly instilled in oil phase in 10min, are obtained transparent uniform
Liquid, as pressure break control water nanoemulsions.
Experimental result is as follows：
1, pressure break control water nanoemulsions basic performance：
It takes 0.3 part of Examples 1 to 5 pressure break control water to be added into 100 parts of water with nanoemulsions, is uniformly mixed, obtain homogeneous
Transparent liquid, difference mini-frac liquid particle diameter distribution, surface tension, endurance of cutting energy, heat resistance, salt resistant character and drag reduction
Performance, experiment condition and the experimental results are shown inthe following table, wherein normal saline solution formula is：2%KCl+5.5%NaCl+0.45%
MgCl2+ 0.55%CaCl2。
Pressure break control water is small with nanoemulsions grain size it can be seen from table, and surface tension is low, shows excellent endurance of cutting
Energy, heat resistance and salt resistant character.
2, pressure break control water nano-emulsion hydraulic control water effect
0.3 part of Examples 1 to 5 pressure break control water is taken to be added into 100 parts of water with nanoemulsions, to pressure break control water nano-emulsion
Liquid evaluates the effect of gas well control water, and experimental method is according to professional standard SY/T5358-2012《Reservoir sensitivity flowing is real
Test evaluation method》
It carries out, the experimental results are shown inthe following table.
By pressure break control water it can be seen from table enter stratum with nanoemulsions after be adsorbed on blowhole surface, can larger amplitude
Degree reduces water phase permeability, decreases by 70% or more；And on gas phase permeability influence it is smaller, fall control 5% hereinafter,
With preferable control water effect.
Claims (7)
1. a kind of pressure break control water nanoemulsions, it is characterised in that：By weight, including：
20~40 parts of oil phase,
10~30 parts of emulsifier,
1~20 part of assistant for emulsifying agent,
20~80 parts of deionized water；
The oil phase is 20~40 parts of dialkyl polydimethylsiloxanes；
The molecular weight of the dialkyl polydimethylsiloxane is 3800~50000；Its hydroxy radical content is：6.0~12.0%；
By weight, the emulsifier includes the compound of 15~20 parts of alkyl phenol polyoxyethylene ether and polyoxyethylene carboxylate
Object；The alkyl phenol polyoxyethylene ether and the mass ratio range of the polyoxyethylene carboxylate are：4:1~1:2；
The assistant for emulsifying agent include in normal propyl alcohol, n-butanol, n-propylamine, n-butylamine any one or it is arbitrary several.
2. pressure break control water nanoemulsions as described in claim 1, it is characterised in that：By weight, the oil phase is 25
~35 parts of dialkyl polydimethylsiloxanes；
The molecular weight of the dialkyl polydimethylsiloxane is 16000~28000；Its hydroxy radical content is：8.0~10.0%.
3. pressure break control water nanoemulsions as described in claim 1, it is characterised in that：The alkyl phenol polyoxyethylene ether includes
Any one in NP-10, NP-12, NP-13 or arbitrary several combination.
4. pressure break control water nanoemulsions as described in claim 1, it is characterised in that：The polyoxyethylene carboxylate includes
OEO-103 and/or OEO-105.
5. pressure break control water nanoemulsions as described in claim 1, it is characterised in that：The alkyl phenol polyoxyethylene ether is
NP-10；The polyoxyethylene carboxylate is OEO-103；
The mass ratio range of the NP-10 and the OEO-103 is：5:2~5:3.
6. pressure break control water nanoemulsions as described in claim 1, it is characterised in that：By weight, the assistant for emulsifying agent
Including 5 parts of normal propyl alcohols.
7. a kind of preparation method of pressure break control water nanoemulsions, it is characterised in that：The pressure break control water is power with nanoemulsions
Profit requires the pressure break control water nanoemulsions described in any one of 1-6, and the preparation method comprises the following steps：By emulsifier,
Assistant for emulsifying agent is added in oil phase, and 20~40min is stirred under room temperature, 100r/min；Then at 20~80 DEG C, 200~800r/
Under min stirrings, deionized water is uniformly instilled in the oil phase mixed in 10~20min, continue 30~60min of stirring, i.e.,
Obtain pressure break control water nanoemulsions.
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| CN109386252A (en) * | 2018-09-29 | 2019-02-26 | 北京大德广源石油技术服务有限公司 | Water-control fracturing yield increasing method for oil gas well |
| CN109705285A (en) * | 2019-01-18 | 2019-05-03 | 大庆中联信实石油科技开发有限公司 | A kind of nanoemulsions and preparation method thereof |
| CN110344803B (en) * | 2019-06-18 | 2022-05-10 | 中国石油天然气股份有限公司 | Water-control fracturing yield-increasing method for rock debris sandstone bottom water-gas layer |
| CN111236882B (en) * | 2020-01-13 | 2021-12-28 | 西南石油大学 | Capillary blocking completion fluid optimization method protected by dense gas layer |
| CN112280549B (en) * | 2020-09-28 | 2023-05-23 | 长江大学 | Nanoemulsion and fracturing method |
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| CN103059829A (en) * | 2013-01-25 | 2013-04-24 | 中国石油大学(华东) | Nanometer emulsion type water control fracturing fluid for tight gas reservation well and preparation method thereof |
| CN104789205A (en) * | 2014-01-20 | 2015-07-22 | 中国石油天然气股份有限公司 | Nanometer microemulsion cleanup additive |
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| CN103059829A (en) * | 2013-01-25 | 2013-04-24 | 中国石油大学(华东) | Nanometer emulsion type water control fracturing fluid for tight gas reservation well and preparation method thereof |
| CN104789205A (en) * | 2014-01-20 | 2015-07-22 | 中国石油天然气股份有限公司 | Nanometer microemulsion cleanup additive |
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