CN104559997B - A kind of shale gas pressure break slippery water and preparation method thereof - Google Patents
A kind of shale gas pressure break slippery water and preparation method thereof Download PDFInfo
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Abstract
The present invention provides a kind of shale gas pressure break slippery water, and the slippery water is made up of 0.03~0.2wt% of friction reducer, 0.3~1.0wt% of clay stabilizer, 0.3~1.0wt% of cleanup additive, 0.5~2.0wt% of potassium chloride, 0.05~1.0wt% of bactericide and surplus for water.Specifically, friction reducer of the present invention is acrylamide based copolymer, and it is obtained by main body construction unit, addition ionic structure unit and functional monomer copolymerization of acrylamide.The bonded restorations of the friction reducer are 400~6,000,000, and intrinsic viscosity is 1300~1600mLg‑1.The smooth aqueous systems dissolution velocity of the present invention is fast, is uniformly dispersed, and continuous mixture can be used during field application or match somebody with somebody liquid using online blending device, to meet the technical requirements of the big liquid measure pressing crack construction of the high discharge capacity of shale gas reservoir.
Description
Technical field
The invention belongs to petroleum works field, and in particular to shale gas massive hydraulic fracturing house of correction slippery water fracturing fluid is matched somebody with somebody
Fang Zucheng, compound method and main performance evaluation.
Background technology
Domestic conventional oil natural gas resources are limited, and the unconventional petroleum resources such as shale gas will turn into it and substitute energy
Source.With continuing to increase for domestic shale gas exploitation dynamics, slippery water fracturing technique will be fast-developing, slippery water fracturing liquid
The research such as the research and development of additive and preferred optimization, the evaluation of system performance all quickly will be promoted deeply in system.
The effective exploitation of U.S.'s shale gas, change the general layout of world energy sources.The exploration and development of shale gas resource is China
The emphasis of " 12 " concern, and one of study hotspot, research of the domestic many research institutions to shale gas are progressively opened up
Open.
The concept of " slippery water fracturing fluid " is proposed by American researcher, be initially by Halliburton,
Schlumberger and Messina companies are new for one kind of the Barnett shale area joint development of Texas east
Type fracturing fluid.The definition of slippery water pressure break be " in order to obtain commercial value, using a large amount of water and a small amount of additive as fracturing fluid with
Form a kind of fracturing process in the crack of certain geometric shape and flow conductivity ".Using slippery water pressure break can make pressure break expense compared with
Conventional MHF reduces 65%.
The sensitivity of the uniqueness of shale gas reservoir, gas reservoir types and rock is all very big with common sandstone gas otherness, its
Special geological conditions determines that conventional development technique can not be directly applied for the production of shale gas reservoir.Shale gas reservoir can be into
The progress of the crucial horizontal well massive hydraulic fracturing technology of work(exploitation, slippery water are the conventional fracturing fluids of shale gas reservoir pressure break.
Friction reducer is most important additive in slippery water, and the fine or not success or failure to shale gas pressure break of its performance have direct shadow
Ring, it depresses increase flow velocity by reducing frictional resistance, in same pump, so as to improve the pump-in pressure of pump truck and charge velocity.
Friction reducer typically has cationic, anionic and nonionic.The polyacrylamide drop resistance in U.S. Barnett shale area
The resistance-reducing yield of agent is generally 50~70%.
For China's shale gas pressure break also in the exploratory stage, slippery water fracturing fluid used in initial stage is mainly foreign oil clothes
The technology that business company provides, the smooth aqueous systems report of domestic function admirable is also less, is particularly adapted to shale gas pressure break
The research and development and evaluation of the additives such as friction reducer, clay stabilizer, surfactant are at the early-stage.Glued used in conventional fracturing fluid
The additives such as soil stabilizer, surfactant are not exclusively suitable for shale pressure break to be commented, it is necessary to carry out and carry out screening for Journal of Sex Research
Valency.
There are the following problems for the slippery water that offshore company provides：Be first it is less with the adaptation Journal of Sex Research on domestic stratum, no
By which kind of additive with the addition of, injury is whether there is to stratum and just brought for use；Next to that external shale gas buries relatively shallower, pressure break is set
It is standby advanced, string friction loss is concerned about less, and China's shale gas buries relatively deeply, very big, the drop of slippery water is lost in string friction
Friction performance has a great influence to pressure break；Other external fluent material is costly, increases pressure break integrated cost, it is therefore desirable to be directed to
Carry out the adaptation Journal of Sex Research of slippery water fracturing fluid system in domestic shale gas reservoir key area.
Smooth aqueous systems used in domestic scene have that resistance-reducing yield is relatively low, solid-carrying performance is poor, polymeric additive is on ground at present
Layer adsorbance is big and causes the problems such as compared with major injury, it is necessary to develop the high resistance-reducing yield smooth water body good to pressure break target zone compatibility
System, on the premise of identical operation scale, friction reducer dosage reduces, and reduces the cost of slippery water fracturing fluid.
In the shale gas well pressing crack construction of mountain area or hilly country, due to transport inconvenience, pulvis additive adds than liquid
Agent is added to have more advantage, friction reducer used in the present invention is dry-type additive.
The content of the invention
Invention provides a kind of inexpensive Low Damage slippery water formula system for adapting to domestic shale gas reservoir geologic feature, addition
Agent convenient transportation, dissolution velocity is fast, and drop frictional resistance rate is high, it is low that shale rock is injured, and onsite application is convenient, is that shale gas pressure break is high
The big liquid measure construction of discharge capacity provides technical support.
Therefore, the present invention provides a kind of shale gas pressure break slippery water, the slippery water by 0.03~0.2wt% of friction reducer,
0.3~1.0wt% of clay stabilizer, 0.3~1.0wt% of cleanup additive, 0.5~2.0wt% of potassium chloride, 0.05~1.0wt% of bactericide
Formed with surplus for water.
Preferably, in the slippery water friction reducer be 0.03wt%, clay stabilizer 0.3wt%, cleanup additive 0.3wt%,
Potassium chloride is 1.0wt%, bactericide 0.05wt%.
In the specific embodiment of the present invention, the friction reducer is acrylamide based copolymer, and it is with acryloyl
Amine is main body construction unit, addition ionic structure unit and functional monomer copolymerization obtain.Wherein, the ionic structure list
Member is selected from 2- acrylamido dimethyl propylenes sulfonic acid, 2- acrylamidos dodecyl sodium sulfonate, the 2- acrylamido tetradecanes
One or more in base sulfonic acid and 2- acrylamido cetyl sulfonic acid；The functional monomer is selected from the isobutyl of azo two
One or more in base amidine dihydrochloride, diethylene glycol monovinyl base ether, acrylic acid and GMA.Institute
The bonded restorations for stating friction reducer are 400~6,000,000, and intrinsic viscosity is 1300~1600mLg-1。
The friction reducer used in the present invention is preferably applicant disclosed in earlier application：A kind of slippery water pressure break is with third
Acrylamide system friction reducer and its preparation method and application（201210265047.1）, a kind of slippery water pressure break drops with acrylamide
Resist and its preparation method and application（201210265039.7）, a kind of slippery water pressure break acrylamide friction reducer and its system
Preparation Method and application（201210265032.5）, a kind of Acrylamide terpolymer and its preparation method and application
（201210265136.6）, a kind of acrylamide based copolymer and its preparation method and application（201210421047.6）, it is a kind of
Slippery water pressure break acrylamide friction reducer and its preparation method and application（201210422133.9）, a kind of slippery water pressure break
With acrylamide friction reducer and its preparation method and application（201210421155.3）, a kind of slippery water pressure break acrylamide
It is friction reducer and its preparation method and application（201210420912.5）, a kind of slippery water pressure break with acrylamide friction reducer and
Its preparation method and application（201210421124.8）, a kind of Acrylamide terpolymer and its preparation method and application
（201210409930.3）, in above-mentioned ten patent applications, as long as its content does not collide with the content in the application, then this
Ten applications are herein incorporated by reference in the present invention.
In the specific embodiment of the present invention, the clay stabilizer be selected from poly- N hydroxymethyl acrylamide,
Poly- isopropyl alcohol radical alkyl dimethyl ammonium chloride, the copolymer of acrylamide and ethyl acrylate trimethyl ammonium chloride, epoxychloropropane and
One or more in the copolymer of dimethylamine.
In the specific embodiment of the present invention, the cleanup additive is selected from nonionic fluorine carbon surface-active
One or more in agent, anionic fluorine carbon surfactant, methanol, ethanol, isopropanol.
The potassium chloride is industrial goods KCl.
In the specific embodiment of the present invention, the bactericide is in formaldehyde, glyoxal, quaternary ammonium salt
It is one or more；It is preferred that the quaternary ammonium salt is DTAC.
The water may be either clear water, or lake water, river, can also be the fracturing fluid recovery (backflow) liquid through effectively handling.
In the specific embodiment of the present invention, the friction reducer is dry-type friction reducer, and the friction reducer is
Obtained by liquid phase polymerization.
The present invention slippery water fracturing fluid have resistance-reducing yield height, high surface, it is small to shale gas reservoir core damage, low into
This, extemporaneous preparation the features such as facilitating, can meet big liquid measure pressing crack construction demand again suitable shale gas reservoir the characteristics of, to raising I
State's shale gas exploitation has important technology progradation.
The present invention also provides a kind of preparation method of above-mentioned slippery water, including elder generation adds potassium chloride and stirred in water and is allowed to
Dissolving, then add friction reducer wherein and stir and be allowed to dissolve, adding clay stabilizer, cleanup additive and bactericide afterwards and stirring makes
Dissolving, that is, obtain the slippery water.
The effect of invention：1）Described dry-type friction reducer dissolution velocity is fast, and dissolution time is less than 5min, suitable for scene
Continuous mixing device matches somebody with somebody liquid, meets the needs that big liquid measure or the smooth water speed of super large liquid measure are matched somebody with somebody；2）The molecular weight of friction reducer is moderate, glues
Equal relative molecular mass 400-600 ten thousand, small to the absorption of shale rock, injury is low, post-fracturing to return discharge opeing reusable edible；3）This
The smooth aqueous systems cost of invention is low, convenient transportation, has for the shale gas well construction that mountain area or hilly country etc. have inconvenient traffic
There is transport advantage, can also realize the technical requirements of shale gas pressure break slippery water low cost.
Embodiment
1st, slippery water forms：Friction reducer accounts for 0.03%, and clay stabilizer accounts for 0.3%, and cleanup additive accounts for 0.3%, and potassium chloride accounts for
1.0%, bactericide accounts for 0.05%.The friction reducer is acrylamide, 2- acrylamido dimethyl propylenes sulfonic acid, methacrylic acid contracting
The copolymer of water glyceride and acrylic acid, it belongs to anion-polyacrylamide class friction reducer, its bonded restorations
For 5,600,000, intrinsic viscosity 1490mLg-1；The clay stabilizer is to be polymerize with epoxychloropropane, dimethylamine and ethylenediamine
The quaternary ammonium salt cationic copolymer of synthesis；The cleanup additive is the aqueous solution of anion fluorocarbon surfactant and methanol；Institute
It is formaldehyde to state bactericide.
2nd, slippery water is prepared：
According to above-mentioned composition, good required clear water is weighed, precise simultaneously records each additive types and dosage.
First add potassium chloride：KCl solid powders are added under agitation, and stirring 2min is allowed to be completely dissolved；Add
Friction reducer：Dry-type friction reducer is added under agitation, is sufficiently stirred 5min and is allowed to be completely dissolved；After add other additions
Agent：Designed according to formula and add liquid clay stabilizer, cleanup additive and bactericide, stirring 3min is allowed to fully dissolve, and stops stirring
Mix, preparation finishes.
3rd, slippery water fracturing fluid property detects：
1）Stability experiment：
The slippery water prepared is placed on room temperature（23℃）Under, respectively 2 hours, 4 hours, 6 hours, 8 hours, it is 12 small
When, the situation of change of 24 hours and 48 hours observation liquid, experimental result shows that prepared slippery water is uniform liquid always,
Without layering, without suspend, without flocculation, without deposited phenomenon, illustrate that the stability of liquid is good, placing 2 days does not influence to use.
2）Heat endurance is tested：
The slippery water prepared is placed in 75 DEG C of water-bath, seen respectively at 2 hours, 4 hours, 6 hours and 8 hours
Examine the situation of change of slippery water, experimental result shows that prepared slippery water is uniform liquid always, deposit-free, without cotton-shaped
Thing, without lamination, illustrate that the heat endurance of liquid is good.
3）Resistance-reducing performance：
Using the smooth aqueous solution in the tubular type frictional resistance analyzer test present invention at room temperature, a diameter of 15mm straight tube
In, it is different in flow rate under pressure drop, and contrasted with the clear water pressure drop under identical flow velocity, it is determined that " shear rate and resistance-reducing yield it
Between relation curve " and experimental result is listed in table 1.
Table 1
Table 1 test result indicates that：It is 8.29 in mean flow rate（m/s）Under the conditions of, the resistance-reducing yield of slippery water is 65.81%.Say
The resistance-reducing yield for the slippery water prepared in the bright present invention with dry-type friction reducer is high, and drop frictional resistance effect is good, can meet big liquid measure pressure
Liquid is split in 8-20m3The requirement constructed under/min high discharge capacity.
4）Some surface active property：
The surface tension that smooth aqueous systems are measured using K100 interfacial tensimeters is 23.61mN/m, and interfacial tension is
1.18mN/m；The contact angle that smooth aqueous systems are measured using dynamic contact angle instrument is 69 °.Illustrate that the slippery water in the present invention has
High surface, the quick row of returning contributed to after pressing crack construction, reduce injury of the fracturing fluid to Oil in Super-low Permeability densification shale reservoir.
5）Prevent swollen performance：
Slippery water is evaluated to the anti-swollen performance of 2 mouthfuls of shale cores using shale expansion instrument, as a result shows that anti-dilative is more than
80%, illustrate that the slippery water in the present invention has good preventive effect of expansion, the expansion of fracturing process CLAY MINERALS AND THEIR SIGNIFICANCE and particulate can be prevented
The injury migrated to shale gas reservoir.
6）Dynamic injury performance：
Infringement of the smooth aqueous systems to shale core matrix permeability is determined using fracturing fluid damage evaluation instrument to test, experiment
By oil and gas industry standard SY/T5107-2005《Aqueous fracturing fluid method of evaluating performance》Middle fracturing fluid filtrate is to rock core base
Matter permeability impairment experiment performs.Test result indicates that slippery water is 9.46% to the average injury rate of shale core.Illustrate this hair
Bright middle slippery water is small to shale gas reservoir core damage.
4th, the field application of slippery water fracturing fluid：
The smooth water additive of the present invention is cost-effective, and dry-type friction reducer convenient transportation, dissolution velocity is fast, disperses equal
It is even, it continuous mixture or online blending device can be used to match somebody with somebody liquid during field application, the big liquid measure pressure break of shale gas reservoir huge discharge can be met
The technical requirements of construction.
Claims (9)
1. a kind of shale gas pressure break slippery water, the slippery water by 0.03~0.2wt% of friction reducer, clay stabilizer 0.3~
1.0wt%, 0.3~1.0wt% of cleanup additive, 0.5~2.0wt% of potassium chloride, 0.05~1.0wt% of bactericide and surplus are water group
Into；
The friction reducer is acrylamide based copolymer, and it is using acrylamide as main body construction unit, addition ionic structure list
Member and functional monomer are copolymerized and obtained；
The bonded restorations of the friction reducer are 400~5,600,000；
The functional monomer is acrylic acid and GMA；
The ionic structure unit is 2- acrylamide-2-methylpro panesulfonic acids.
2. slippery water according to claim 1, it is characterised in that friction reducer 0.03wt%, clay stabilizer are
0.3wt%, cleanup additive 0.3wt%, potassium chloride 1.0wt%, bactericide 0.05wt%.
3. slippery water according to claim 1, it is characterised in that the intrinsic viscosity of the friction reducer be 1300~
1600mL·g-1。
4. slippery water according to claim 1 or 2, it is characterised in that the clay stabilizer is selected from poly- N- methylols
Acrylamide, poly- isopropyl alcohol radical alkyl dimethyl ammonium chloride, copolymer, the epoxy of acrylamide and ethyl acrylate trimethyl ammonium chloride
One or more in the copolymer of chloropropane and dimethylamine.
5. slippery water according to claim 1 or 2, it is characterised in that the cleanup additive is selected from nonionic fluorine carbon
One or more in surfactant, anionic fluorine carbon surfactant, methanol, ethanol, isopropanol.
6. slippery water according to claim 1 or 2, it is characterised in that the bactericide is selected from formaldehyde, glyoxal, season
One or more in ammonium salt class.
7. slippery water according to claim 6, it is characterised in that the quaternary ammonium salt is trimethyl chlorination
Ammonium.
8. the slippery water according to any one in claims 1 to 3, it is characterised in that the friction reducer drops for dry-type
Resist, and the friction reducer is obtained by liquid phase polymerization.
9. a kind of preparation method of the slippery water as described in any one in claim 1~8, including elder generation add potassium chloride in water
And stir and be allowed to dissolve, then add friction reducer wherein and stir and be allowed to dissolve, clay stabilizer, cleanup additive and sterilization are added afterwards
Agent and stir be allowed to dissolve, that is, obtain the slippery water.
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| CN108559479A (en) * | 2018-05-30 | 2018-09-21 | 西南石油大学 | It is a kind of can On-line construction verse phase microemulsion polymer fracturing fluid system |
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| CN105018065A (en) * | 2015-06-15 | 2015-11-04 | 中国石油集团西部钻探工程有限公司 | Slick water suitable for field continuous mixing, and preparation method therefor |
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| CN105777982A (en) * | 2016-03-16 | 2016-07-20 | 西安嘉宏能源化工科技有限公司 | Drag reducer for slickwater fracturing fluid and synthesis method for drag reducer |
| CN107523286A (en) * | 2016-06-20 | 2017-12-29 | 深圳市百勤石油技术有限公司 | A kind of cleaning slippery water fracturing fluid for shale reservoir and preparation method thereof |
| CN106566523A (en) * | 2016-11-02 | 2017-04-19 | 成都劳恩普斯科技有限公司 | Polymer-type acidic slickwater and preparation method thereof |
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| CN107236531A (en) * | 2017-07-18 | 2017-10-10 | 中国石油集团渤海钻探工程有限公司 | Shale gas pressure break environment-friendly type slippery water friction reducer and preparation method thereof |
| CN109915101A (en) * | 2017-12-13 | 2019-06-21 | 北京华油油气技术开发有限公司 | A kind of full fracture guide fracturing technology |
| CN108865105B (en) * | 2018-08-06 | 2019-06-14 | 西南石油大学 | A kind of smooth aqueous systems of low adsorption injury |
| CN111218268B (en) * | 2018-11-26 | 2022-02-01 | 中国石油天然气股份有限公司 | Slickwater for compact sandstone reservoir and preparation method thereof |
| CN110628407A (en) * | 2019-09-30 | 2019-12-31 | 中国石油集团渤海钻探工程有限公司 | Oil washing agent for slickwater, preparation method thereof and slickwater system |
| CN113214816A (en) * | 2021-05-14 | 2021-08-06 | 西南石油大学 | Variable-viscosity slippery water and preparation method thereof |
| CN115011325B (en) * | 2022-07-12 | 2024-01-12 | 四川省威沃敦化工有限公司 | Low-carbon self-dispersing clean instant resistance reducing agent for fracturing |
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| CN108559479A (en) * | 2018-05-30 | 2018-09-21 | 西南石油大学 | It is a kind of can On-line construction verse phase microemulsion polymer fracturing fluid system |
| CN108559479B (en) * | 2018-05-30 | 2020-05-22 | 西南石油大学 | Reverse microemulsion polymer fracturing liquid system capable of being constructed on line |
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