CN103555312A - Nano composite fiber clean fracturing fluid and preparation method thereof - Google Patents
Nano composite fiber clean fracturing fluid and preparation method thereof Download PDFInfo
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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
- C09K8/62—Compositions for forming crevices or fractures
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Abstract
The invention provides a nano composite fiber clean fracturing fluid which comprises the following components in percentage by weight: 0.01wt%-0.2 wt% of nano fiber complex, 0.8wt%-1.5wt% of fiber dispersant, 3wt%-5wt% of anti-swelling agent, 0.3wt%-0.6wt% of conditioner, 0.1wt%-0.3wt% of anti-scale agent and the balance of water, wherein the nano fiber complex is polymer/inorganic ion nano composite fiber, polymer/carbon nano tube composite fiber or polymer/layered filler composite fiber. Since the nano composite fiber is uniformly dispersed in the fracturing fluid, a fiber network can be formed, the sand carrying property of the fracturing fluid is improved, the settling mode is changed, and the settling rate of a propping agent is reduced. Moreover, the nano composite fiber also can effectively prevent backflow of the propping agent and effectively reduce the filter loss rate, and the damage rate on a coal seam is only 3-10%.
Description
Technical field
The present invention relates to coal bed gas well fracturing yield increasing technical field, particularly nano-composite fiber clean fracturing fluid and preparation method thereof.
Background technology
Coal-seam gas is a kind of by coalbed-forming and mainly preserve the unconventional Sweet natural gas that methane is main component of take in coal seam with adsorbed state.Its calorific value and conventional gas are suitable, are 2～5 times of general coal gas, seldom produce pollutent after burning, belong to the high-quality clean gas energy.
Coalbed methane reservoir has low hole, hypotonic feature, and natural production capacity is low, conventionally need to take pressing crack construction could obtain suitable industrial output, realizes the economic exploitation.Waterfrac treatment coal seam be completion-well stimulation modal be also one of most important means.Its principle is: utilize water power to form high pressure in well, when pressure surpasses after the ultimate compression strength of coal seam, coal seam fracture open also starts to extend, and forms a large amount of T-shapes crack; Continue to inject the sand-carrying agent with propping agent, crack is extended forward and is filled out with propping agent, after closing well, crack closure is on propping agent, thereby near shaft bottom, in stratum, form the sand packed fracture with certain geometrical dimension and flow conductivity, link up cracks in coal seam, improve the seepage characteristic in coal seam, improve coal seam percolation ability; Finally, by the process of coal-seam gas draining-step-down-desorb, reach the object of normal exhaust.
The fracturing liquid that coal bed gas well pressing crack construction is conventional has: active water fracturing liquid, linear fracturing fluid, crosslinked gel fracturing liquid etc.
Wherein, active water fracturing liquid viscosity is low, can in hypotonic coal seam, make seam, but simultaneously because its viscosity is low, can increase leak-off, causes that proppants settle down is too fast, a little less than prop-carrying capacity.
Summary of the invention
The technical problem that the present invention solves is to provide a kind of nano-composite fiber clean fracturing fluid, and taking grittiness can be good.
The invention discloses a kind of nano-composite fiber clean fracturing fluid, comprising:
The nanofiber composite of 0.01wt%～0.2wt%;
The dispersing agent for fibre of 0.8wt%～1.5wt%;
The expansion-resisting agent of 3wt%～5wt%;
The amendment of 0.3wt%～0.6wt%;
The scale inhibitor of 0.1wt%～0.3wt%;
Surplus is water;
Described nanofiber composite is polymer/inorganic ion nano-composite fiber, polymer/carbon nano-tube conjugated fibre or polymer/laminated filler conjugated fibre.
Preferably, the fiber surface of described nanofiber composite and end face particle are dispersed with 50～70nm.
Preferably, the length of described nanofiber composite is 0.5～1cm.
Preferably, described nanofiber composite is polymer/montmorillnoite nano conjugated fibre, polymer/graphite nanometer conjugated fibre, polymer/metal oxidate nano conjugated fibre.
Preferably, the preparation method of described polymer/montmorillnoite nano conjugated fibre is:
The polynite aqueous solution is reacted under silane coupling agent effect with palmityl trimethyl ammonium chloride, obtain organo montmorillonite;
Described organo montmorillonite and polymer blending are extruded, obtained pellet;
Described pellet, through spinning, is obtained to polymer/montmorillnoite nano conjugated fibre.
Preferably, described dispersing agent for fibre is anion surfactant.
Preferably, described expansion-resisting agent is Repone K or sodium-chlor.
Preferably, described amendment is sodium hydroxide or potassium hydroxide.
Preferably, described scale inhibitor is disodium ethylene diamine tetraacetate.
The preparation method who the invention also discloses a kind of nano-composite fiber clean fracturing fluid, comprises the following steps:
By the nanofiber composite of 0.01wt%～0.2wt%, the dispersing agent for fibre of 0.8wt%～1.5wt%, the expansion-resisting agent of 3wt%～5wt%, the amendment of 0.3wt%～0.6wt% and the scale inhibitor of 0.1wt%～0.3wt% are added to the water, stirring and dissolving, obtains nano-composite fiber clean fracturing fluid;
Described nanofiber composite is polymer/inorganic ion nano-composite fiber, polymer/carbon nano-tube conjugated fibre or polymer/laminated filler conjugated fibre.
Compared with prior art, nano-composite fiber clean fracturing fluid of the present invention, comprising: the nanofiber composite of 0.01wt%～0.2wt%; The dispersing agent for fibre of 0.8wt%～1.5wt%; The expansion-resisting agent of 3wt%～5wt%; The amendment of 0.3wt%～0.6wt%; The scale inhibitor of 0.1wt%～0.3wt%; Surplus is water; Described nanofiber composite is polymer/inorganic ion nano-composite fiber, polymer/carbon nano-tube conjugated fibre or polymer/laminated filler conjugated fibre.Because nano-composite fiber is dispersed in fracturing liquid, can form fibre network, therefore improved and of the fracturing fluidly taken grittiness energy, and changed subsidence style, the subsidence rate of the propping agent that slowed down.Secondly, the fracturing liquid that the effect of cooperatively interacting of described nano-composite fiber and dispersing agent for fibre, expansion-resisting agent, amendment and scale inhibitor forms can also form spatial network with propping agent, effectively prevents proppant backflow.And its can shutoff different size microfracture, effectively reduce leak-off rate, to coal seam injury rate, be only 3%～10%.
Accompanying drawing explanation
Fig. 1 is that the of the fracturing fluid frictional resistance of embodiment 2, embodiment 3 and comparative example 1 preparation is with the variation diagram of shearing rate;
Fig. 2 is the fracturing liquid dynamic filtration graphic representation of embodiment 2 and comparative example 1 preparation.
Embodiment
In order further to understand the present invention, below in conjunction with embodiment, the preferred embodiment of the invention is described, but should be appreciated that these are described is for further illustrating the features and advantages of the present invention, rather than limiting to the claimed invention.
The embodiment of the invention discloses a kind of nano-composite fiber clean fracturing fluid, comprising:
The nanofiber composite of 0.01wt%～0.2wt%;
The dispersing agent for fibre of 0.8wt%～1.5wt%;
The expansion-resisting agent of 3wt%～5wt%;
The amendment of 0.3wt%～0.6wt%;
The scale inhibitor of 0.1wt%～0.3wt%;
Surplus is water;
Described nanofiber composite is polymer/inorganic ion nano-composite fiber, polymer/carbon nano-tube conjugated fibre or polymer/laminated filler conjugated fibre.
Nano-composite fiber clean fracturing fluid of the present invention consists of nanofiber composite, dispersing agent for fibre, expansion-resisting agent, amendment, scale inhibitor and water.
Described nanofiber composite can be dispersed in water, and can form fibre network.In order to guarantee the dispersing property of nano-composite fiber in water, the fiber surface of described nanofiber composite and end face particle are preferably dispersed with 50～70nm.The length of described nano-composite fiber is preferably 0.5～1cm.The diameter of described nano-composite fiber is preferably 30～40 μ m, and fiber number is preferably 140～150D, and relative breaking strength is preferably 1～3G/D, and elongation at break is preferably 60～70%.Described nanofiber composite is polymer/inorganic ion nano-composite fiber, polymer/carbon nano-tube conjugated fibre or polymer/laminated filler conjugated fibre, is preferably polymer/montmorillnoite nano conjugated fibre, polymer/graphite nanometer conjugated fibre, polymer/metal oxidate nano conjugated fibre.The preparation method of described polymer/montmorillnoite nano conjugated fibre is preferably:
The polynite aqueous solution is reacted under silane coupling agent effect with palmityl trimethyl ammonium chloride, obtain organo montmorillonite;
Described organo montmorillonite and polymer blending are extruded, obtained pellet;
Described pellet, through spinning, is obtained to polymer/montmorillnoite nano conjugated fibre.
In preparing the process of polymer/montmorillnoite nano conjugated fibre, with melt intercalated method, make polymkeric substance and polynite melt blending form nano-fiber composite material, cover the native effect of playing enhancing and crystallization nucleation of holder, make fiber there is good thermostability, surfactivity and anti-degradation property.
In preparing the process of polymer/montmorillnoite nano conjugated fibre, first the polynite aqueous solution reacts under silane coupling agent effect with palmityl trimethyl ammonium chloride, obtains organo montmorillonite.Described polynite is preferably 2:1 type laminated crystalline body, and described polymkeric substance is preferably polypropylene.The mass percentage concentration of the described polynite aqueous solution is preferably 8～15%, and more preferably 10～12%.The described polynite aqueous solution preferably stirs and is warming up to after 70～90 ℃, then adds successively the palmityl trimethyl ammonium chloride aqueous solution and silane coupling agent, and the time that the described polynite aqueous solution reacts with palmityl trimethyl ammonium chloride is 2～4 hours.
Obtain after organo montmorillonite, described organo montmorillonite and polymer blending are extruded, obtain pellet.Described polymkeric substance is preferably polypropylene.The mass ratio of described organo montmorillonite and described polymkeric substance is preferably 1:(7～15), 1:(9～10 more preferably).The temperature of described blending extrusion is preferably 180～220 ℃.
Obtain after pellet, carried out spinning and can obtain polymer/montmorillnoite nano conjugated fibre.The present invention is not particularly limited for the device of spinning, selects spinning-drawing machine well known to those skilled in the art.If select spinning-drawing machine to introspect, preferably adjusting 1 district～7 district temperature is 160 ℃～210 ℃, and pump speed is 14r/min～24r/min, and winding speed is 250m/min～1000m/min, makes spinning in stable state, is curled into silk after drawing-off.
In the present invention, the consumption of described nanofiber composite is 0.01wt%～0.2wt%, is preferably 0.05wt%～0.15wt%.
Nano-composite fiber clean fracturing fluid of the present invention also comprises dispersing agent for fibre, and the effect of described dispersing agent for fibre is the dissolving that promotes nano-fiber composite material.Described dispersing agent for fibre is preferably anion surfactant, the model that the anion surfactant that the model that more preferably the oleic acid anion surfactant of 18 carbon, Hefei Feng Zhi development in science and technology company limited produce is D2F-AS11 or Hefei Feng Zhi development in science and technology company limited produce is D3F-AS05 anion surfactant, most preferably is D3F-AS05 anion surfactant.The content of described dispersing agent for fibre is 0.8wt%～1.5wt%, is preferably 1.0wt%～1.3wt%.
In the present invention, described expansion-resisting agent can be adsorbed on surface of clay, prevents coal gas reservoir CLAY MINERALS AND THEIR SIGNIFICANCE hydration swelling and disperses migration.Described expansion-resisting agent is preferably Repone K or sodium-chlor.Because sodium ion easily makes of the fracturing fluid temperature tolerance, decline, therefore, described expansion-resisting agent is Repone K more preferably.In addition, its anti-ionization of the potassium ion in Repone K, improves of the fracturing fluid surfactivity.The content of described expansion-resisting agent is 3wt%～5wt%, more preferably 3.5wt%～4.5wt%.
In the present invention, described amendment can promote the dissolving of oil-soluble substance, is preferably sodium hydroxide or potassium hydroxide; Due to K
+temperature tolerance relatively good, and K
+therefore can play the effect that prevents clay swelling, potassium hydroxide more preferably.The content of described amendment is 0.3wt%～0.6wt%, is preferably 0.4wt%～0.5wt%.
In the present invention, described scale inhibitor is preferably disodium ethylene diamine tetraacetate, and it can form stable water soluble complex with basic metal, rare earth element and transition metal etc., and can improve outskirts of a town type and stability.The content of described scale inhibitor is 0.1wt%～0.3wt%, is preferably 0.15wt%～0.25wt%.
The preparation method who the invention also discloses a kind of nano-composite fiber clean fracturing fluid, comprises the following steps:
By the nanofiber composite of 0.01wt%～0.2wt%, the dispersing agent for fibre of 0.8wt%～1.5wt%, the expansion-resisting agent of 3wt%～5wt%, the amendment of 0.3wt%～0.6wt% and the scale inhibitor of 0.1wt%～0.3wt% are added to the water, stirring and dissolving, obtains nano-composite fiber clean fracturing fluid;
Described nanofiber composite is polymer/inorganic ion nano-composite fiber, polymer/carbon nano-tube conjugated fibre or polymer/laminated filler conjugated fibre.
In the present invention, be dissolved in the water nanofiber composite, dispersing agent for fibre, expansion-resisting agent, amendment and scale inhibitor are dispersed, the time of described stirring and dissolving is preferably 10～15 minutes.
The subsidence rate of the nano-composite fiber clean fracturing fluid obtaining, frictional resistance and leak-off situation are tested, and result shows, nano-composite fiber clean fracturing fluid of the present invention can reduce the speed of getting married of propping agent, increases prop-carrying capacity, and frictional resistance is little, and leak-off is few.
In order further to understand the present invention, below in conjunction with embodiment, nano-composite fiber clean fracturing fluid provided by the invention and preparation method thereof is described, protection scope of the present invention is not limited by the following examples.
The massfraction 10% polynite aqueous solution is added in reactor, stirring is warming up to 80 ℃, drip the appropriate palmityl trimethyl ammonium chloride aqueous solution, violent stirring reaction 12h, add again 2% silane coupling agent reaction 2h, product is placed in baking oven certain temperature and is dried to constant, and pulverizer was pulverized 200 molecules of interest sieves, obtained organo montmorillonite.
Organo montmorillonite and PP extrude and make polynite/polypropylene composite material 200 ℃ of twin screws with 1:9 ratio, and then to add the polypropene blended polynite content that makes be 5% sample pellet to secondary.
Nano combined pellet is put into spinning-drawing machine screw rod, adjust each district's temperature, open spinning pump, until spin fluid, be and stablize that streamline is discharged and during without bubble, filament spinning component be installed and started spinning, adjust 160 ℃～210 ℃ of 1 district～7 district temperature, pump speed 14r/min～24r/min, winding speed 250m/min～1000m/min, makes spinning in stable state, after drawing-off, be curled into silk, cutting machine makes nano-composite fiber.
Fiber surface and end face particle are dispersed with 55nm～60nm, and length is 0.5cm～0.8cm, and Fibre diameter is 35 μ m, and fiber number is 142.5D, and relative breaking strength is 2.0G/D, and elongation at break is 67.7%.
The nano-composite fiber and the 40g solid granular KCl that in 1000ml clear water, add successively KOH, 10g aqueous solution of anionic surfactant, 5g embodiment 1 preparation of 2g EDETATE SODIUM, 5g solid sheet, stir, make it abundant dissolving, form coal bed gas well nano-composite fiber clean fracturing fluid.In the nano-composite fiber clean fracturing fluid forming, EDETATE SODIUM accounts for 0.2% of clear water quality, and KOH accounts for 0.5% of clear water quality, and anion surfactant accounts for 1% of clear water quality, and nano-composite fiber accounts for 0.1% of clear water quality, and KCl accounts for 4% of clear water quality.
During fracturing reform, the omnidistance nano-composite fiber clean fracturing fluid that uses of sand-carrying agent stage, can not add nano-composite fiber at spearhead and displacing liquid stage.
Frictional resistance to the nano-composite fiber clean fracturing fluid obtaining is tested, and result is referring to Fig. 1, and Fig. 1 is that the of the fracturing fluid frictional resistance of embodiment 2, embodiment 3 and comparative example 1 preparation is with the variation diagram of shearing rate.In Fig. 1,
for the fracturing liquid of the embodiment 2 preparation frictional resistance under different shear rate;
for the fracturing liquid of the embodiment 3 preparation frictional resistance under different shear rate;
for the fracturing liquid of the comparative example 1 preparation frictional resistance under different shear rate.As shown in Figure 1, it is relatively low that the present invention adds the fracturing liquid frictional resistance of nanofiber composite, and along with the increase of nanofiber composite addition and the increase of shearing rate, the fall of frictional resistance also increases thereupon.
Dynamic filtration to the nano-composite fiber clean fracturing fluid obtaining is tested, and result is referring to Fig. 2, and Fig. 2 is the fracturing liquid dynamic filtration graphic representation of embodiment 2 and comparative example 1 preparation.In Fig. 2, A curve is the of the fracturing fluid dynamic filtration graphic representation of embodiment 2 preparations; B curve is the of the fracturing fluid dynamic filtration graphic representation of comparative example 1 preparation.As shown in Figure 2, the present invention adds the fracturing liquid of nanofiber composite can effectively reduce leak-off.
For alkali, in the quick or quick stratum of weak base, the add-on of amendment suitably reduces.The nano-composite fiber and the 40g solid granular KCl that in 1000ml clear water, add successively KOH, 10g aqueous solution of anionic surfactant, 7g embodiment 1 preparation of 2g EDETATE SODIUM, 3.5g solid sheet, stir, make it abundant dissolving, form coal bed gas well nano-composite fiber clean fracturing fluid.In the nano-composite fiber clean fracturing fluid forming, EDETATE SODIUM accounts for 0.2% of clear water quality, and KOH accounts for 0.35% of clear water quality, and anion surfactant accounts for 1% of clear water quality, and nano-composite fiber accounts for 0.1% of clear water quality, and KCl accounts for 4% of clear water quality.During fracturing reform, the omnidistance nano-composite fiber clean fracturing fluid that uses of sand-carrying agent stage, can not add nano-composite fiber at spearhead and displacing liquid stage.
Frictional resistance to the nano-composite fiber clean fracturing fluid obtaining is tested, and result is referring to Fig. 1, and Fig. 1 is that the of the fracturing fluid frictional resistance of embodiment 2, embodiment 3 and comparative example 1 preparation is with the variation diagram of shearing rate.
The nano-composite fiber and the 40g solid granular KCl that in the water that contains more calcium, magnesium ion at 1000ml, add KOH, 10g aqueous solution of anionic surfactant, 9g embodiment 1 preparation of 3g EDETATE SODIUM, 5g solid sheet, stir, make it abundant dissolving, form coal bed gas well nano-composite fiber clean fracturing fluid.In the nano-composite fiber clean fracturing fluid forming, EDETATE SODIUM accounts for 0.3% of clear water quality, and KOH accounts for 0.5% of clear water quality, and anion surfactant accounts for 1% of clear water quality, and nano-composite fiber accounts for 0.1% of clear water quality, and KCl accounts for 4% of clear water quality.During fracturing reform, the omnidistance nano-composite fiber clean fracturing fluid that uses of sand-carrying agent stage, can not add nano-composite fiber at spearhead and displacing liquid stage.
Quick or the quick stratum of weak base for alkali, the nano-composite fiber and the 35g solid granular KCl that in the water that contains more calcium, magnesium ion at 1000ml, add KOH, 10g aqueous solution of anionic surfactant, 12g embodiment 1 preparation of 3g EDETATE SODIUM, 3.5g solid sheet, stir, make it abundant dissolving, form coal bed gas well nano-composite fiber clean fracturing fluid.In the nano-composite fiber clean fracturing fluid forming, EDETATE SODIUM accounts for 0.3% of clear water quality, and KOH accounts for 0.35% of clear water quality, and anion surfactant accounts for 1% of clear water quality, and nano-composite fiber accounts for 0.1% of clear water quality, and KCl accounts for 3.5% of clear water quality.During fracturing reform, the omnidistance nano-composite fiber clean fracturing fluid that uses of sand-carrying agent stage, can not add nano-composite fiber at spearhead and displacing liquid stage.
To dark coal seam, stratum that coal seam temperature is relatively high, the nano-composite fiber and the 40g solid granular KCl that in 1000ml clear water, add successively KOH, 15g aqueous solution of anionic surfactant, 15g embodiment 1 preparation of 2g EDETATE SODIUM, 5g solid sheet, stir, make it abundant dissolving, form coal bed gas well nano-composite fiber clean fracturing fluid.In the nano-composite fiber clean fracturing fluid forming, EDETATE SODIUM accounts for 0.2% of clear water quality, and KOH accounts for 0.5% of clear water quality, and anion surfactant accounts for 1.5% of clear water quality, and nano-composite fiber accounts for 0.1% of clear water quality, and KCl accounts for 4% of clear water quality.During fracturing reform, the omnidistance nano-composite fiber clean fracturing fluid that uses of sand-carrying agent stage, can not add nano-composite fiber at spearhead and displacing liquid stage.
For the larger coal seam of leak-off, the nano-composite fiber and the 40g solid granular KCl that in 1000ml clear water, add successively KOH, 15g aqueous solution of anionic surfactant, 2g embodiment 1 preparation of 2g EDETATE SODIUM, 5g solid sheet, stir, make it abundant dissolving, form coal bed gas well nano-composite fiber clean fracturing fluid.In the nano-composite fiber clean fracturing fluid forming, EDETATE SODIUM accounts for 0.2% of clear water quality, and KOH accounts for 0.5% of clear water quality, and anion surfactant accounts for 1.5% of clear water quality, and nano-composite fiber accounts for 0.2% of clear water quality, and KCl accounts for 4% of clear water quality.
During fracturing reform, the omnidistance nano-composite fiber clean fracturing fluid that uses of sand-carrying agent stage, can not add nano-composite fiber at spearhead and displacing liquid stage.
Comparative example 1
The KOH, 10g aqueous solution of anionic surfactant and the 40g solid granular KCl that in 1000ml clear water, add successively 2g EDETATE SODIUM, 5g solid sheet, stir, and makes it abundant dissolving, forms coal bed gas well nano-composite fiber clean fracturing fluid.In the nano-composite fiber clean fracturing fluid forming, EDETATE SODIUM accounts for 0.2% of clear water quality, and KOH accounts for 0.5% of clear water quality, and anion surfactant accounts for 1% of clear water quality, and nano-composite fiber accounts for 0.1% of clear water quality, and KCl accounts for 4% of clear water quality.
During fracturing reform, the omnidistance nano-composite fiber clean fracturing fluid that uses of sand-carrying agent stage, can not add nano-composite fiber at spearhead and displacing liquid stage.
Each 500ml of fracturing liquid of embodiment 2～6 and comparative example 1 preparation is loaded on respectively in graduated cylinder, adds respectively the propping agent of 25% sand ratio, it is 20/40 object haydite that propping agent used wins for card the particle diameter of producing, and its density is 1.65g/cm
3, after mixing under normal temperature, at normal temperature and 60 ℃, place 1 hour respectively, subsidence rate relatively, result is referring to table 1.
The of the fracturing fluid subsidence rate comparison of table 1
As shown in Table 1, nano-composite fiber clean fracturing fluid of the present invention greatly reduces the subsidence rate of propping agent, has strengthened prop-carrying capacity.
Frictional resistance to the nano-composite fiber clean fracturing fluid obtaining is tested, and result is referring to Fig. 1, and Fig. 1 is that the of the fracturing fluid frictional resistance of embodiment 2, embodiment 3 and comparative example 1 preparation is with the variation diagram of shearing rate.
Dynamic filtration to the nano-composite fiber clean fracturing fluid obtaining is tested, and result is referring to Fig. 2, and Fig. 2 is the fracturing liquid dynamic filtration graphic representation of embodiment 2 and comparative example 1 preparation.In Fig. 2, A curve is the of the fracturing fluid dynamic filtration graphic representation of embodiment 2 preparations; B curve is the of the fracturing fluid dynamic filtration graphic representation of comparative example 1 preparation.As shown in Figure 2, the present invention adds the fracturing liquid of nanofiber composite can effectively reduce leak-off.
The explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improvement and modification also fall in the protection domain of the claims in the present invention.
Above-mentioned explanation to the disclosed embodiments, makes professional and technical personnel in the field can realize or use the present invention.To the multiple modification of these embodiment, will be apparent for those skilled in the art, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a nano-composite fiber clean fracturing fluid, comprising:
The nanofiber composite of 0.01wt%～0.2wt%;
The dispersing agent for fibre of 0.8wt%～1.5wt%;
The expansion-resisting agent of 3wt%～5wt%;
The amendment of 0.3wt%～0.6wt%;
The scale inhibitor of 0.1wt%～0.3wt%;
Surplus is water;
Described nanofiber composite is polymer/inorganic ion nano-composite fiber, polymer/carbon nano-tube conjugated fibre or polymer/laminated filler conjugated fibre.
2. nano-composite fiber clean fracturing fluid according to claim 1, is characterized in that, the fiber surface of described nanofiber composite and end face particle are dispersed with 50～70nm.
3. nano-composite fiber clean fracturing fluid according to claim 2, is characterized in that, the length of described nanofiber composite is 0.5～1cm.
4. nano-composite fiber clean fracturing fluid according to claim 3, is characterized in that, described nanofiber composite is polymer/montmorillnoite nano conjugated fibre, polymer/graphite nanometer conjugated fibre, polymer/metal oxidate nano conjugated fibre.
5. nano-composite fiber clean fracturing fluid according to claim 4, is characterized in that, the preparation method of described polymer/montmorillnoite nano conjugated fibre is:
The polynite aqueous solution is reacted under silane coupling agent effect with palmityl trimethyl ammonium chloride, obtain organo montmorillonite;
Described organo montmorillonite and polymer blending are extruded, obtained pellet;
Described pellet, through spinning, is obtained to polymer/montmorillnoite nano conjugated fibre.
6. nano-composite fiber clean fracturing fluid according to claim 1, is characterized in that, described dispersing agent for fibre is anion surfactant.
7. nano-composite fiber clean fracturing fluid according to claim 1, is characterized in that, described expansion-resisting agent is Repone K or sodium-chlor.
8. nano-composite fiber clean fracturing fluid according to claim 1, is characterized in that, described amendment is sodium hydroxide or potassium hydroxide.
9. nano-composite fiber clean fracturing fluid according to claim 1, is characterized in that, described scale inhibitor is disodium ethylene diamine tetraacetate.
10. a preparation method for nano-composite fiber clean fracturing fluid, comprises the following steps:
By the nanofiber composite of 0.01wt%～0.2wt%, the dispersing agent for fibre of 0.8wt%～1.5wt%, the expansion-resisting agent of 3wt%～5wt%, the amendment of 0.3wt%～0.6wt% and the scale inhibitor of 0.1wt%～0.3wt% are added to the water, stirring and dissolving, obtains nano-composite fiber clean fracturing fluid;
Described nanofiber composite is polymer/inorganic ion nano-composite fiber, polymer/carbon nano-tube conjugated fibre or polymer/laminated filler conjugated fibre.
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| CN104130763A (en) * | 2014-07-24 | 2014-11-05 | 中国石油天然气股份有限公司 | Fracturing fluid containing carbon nano-tube and viscous-elastic anionic surfactant and preparation method thereof |
| CN104498019A (en) * | 2014-12-27 | 2015-04-08 | 重庆地质矿产研究院 | Nano-coating fiber active water fracturing fluid |
| CN105131930A (en) * | 2015-07-22 | 2015-12-09 | 中国石油天然气股份有限公司 | Liquid-phase CO2 fracturing fluid |
| CN106800926A (en) * | 2015-11-26 | 2017-06-06 | 北京纽荷瑞晨能源技术有限公司 | A kind of nano-composite fiber liquid carbon dioxide fracturing fluid |
| CN107090715A (en) * | 2017-04-27 | 2017-08-25 | 中国石油化工股份有限公司 | A kind of pressure break modified fibre, the mixed water injection equipment of the modified fibre and mixed water injection method |
| CN107090715B (en) * | 2017-04-27 | 2019-11-19 | 中国石油化工股份有限公司 | A kind of pressure break modified fibre, the mixed water injection equipment of the modified fibre and mixed water injection method |
| CN108300451A (en) * | 2018-04-08 | 2018-07-20 | 中国石油大学(华东) | A kind of nano material complex intensifying gelled fracturing fluid and preparation method thereof |
| CN113913176A (en) * | 2020-07-08 | 2022-01-11 | 中国石油化工股份有限公司 | Fracturing fluid and method for fracturing in shale by using same |
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