CN106479474A - Shale gas pressure break crosslinkable polymeric linear colloid system and preparation method thereof - Google Patents
Shale gas pressure break crosslinkable polymeric linear colloid system and preparation method thereof Download PDFInfo
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- CN106479474A CN106479474A CN201610786816.0A CN201610786816A CN106479474A CN 106479474 A CN106479474 A CN 106479474A CN 201610786816 A CN201610786816 A CN 201610786816A CN 106479474 A CN106479474 A CN 106479474A
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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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- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
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Abstract
The invention discloses a kind of shale gas pressure break crosslinkable polymeric linear colloid system and preparation method thereof, in parts by weight, described polymeric linear colloid system includes 0.3～0.5 part of thickening agent, 0.3～0.5 portion of clay stabilizer, 0.3～0.5 portion of cleanup additive, 0.2～0.3 part of cross-linking agent and 98.2～98.9 parts and returns discharge opeing.Described preparation method includes preparing base fluid step and blend step, takes the discharge opeing of returning of formula ratio, adds thickening agent simultaneously to stir to dissolving, adds clay stabilizer and the cleanup additive of formula ratio, and base fluid standby is obtained after mix homogeneously；In fracturing work, the cross-linking agent of formula ratio is added in described base fluid and obtains described polymeric linear colloid system.The linear gum base liquid that the present invention prepares in returning discharge opeing applies wider low concentration guar gum system to have the characteristics that viscosity is high, cross-linking, frictional resistance is low, sand washing replacement effect is good more at present, has a good application prospect.
Description
Technical field
The present invention relates to the technical field of shale gas extensive volume fracturing rebuilding construction, more particularly, it is related to one kind
Shale gas pressure break crosslinkable polymeric linear colloid system and preparation method thereof.
Background technology
In the fracture technology of current shale gas, the linear fracturing fluid system of employing is low concentration guar gum system.
Due to shale gas construction can produce substantial amounts of return discharge opeing, therefore scene is joined liquid water and is substantially used and returns discharge opeing.But, return
The salinity of discharge opeing is higher and complex chemical composition, prepares linear gum base liquid according to low concentration guar gum, then hold in returning discharge opeing
Easily occur viscous relatively slow or do not played viscous phenomenon, had a strong impact on the sand washing of linear fracturing fluid system and replace effect.
Therefore, it is necessary to provide a kind of using returning discharge opeing preparation and the more excellent crosslinkable polymerization of shale gas pressure break of effect
Thing linear colloid system and preparation method thereof.
Content of the invention
Poor in order to solve the problems, such as the linear gum base liquid effect that existing low concentration guar gum is prepared, the purpose of the present invention is to carry
For a kind of shale in the linear gum base liquid returning preparation in discharge opeing with the features such as viscosity is high, cross-linking, sand washing replacement effect is good
Air pressure splits with crosslinkable polymeric linear colloid system and preparation method thereof.
An aspect of of the present present invention discloses the crosslinkable polymeric linear colloid system of shale gas pressure break, in parts by weight,
Described polymeric linear colloid system includes 0.3～0.5 part of thickening agent, 0.3～0.5 part of clay stabilizer, 0.3～0.5 part of row of helping
Agent, 0.2～0.3 part of cross-linking agent and 98.2～98.9 parts return discharge opeing,
Described thickening agent is that the preparation process of modified polyacrylamide and described thickening agent is：Protection in noble gases
Under, will be soluble in water for acrylamide and add function monomer, it is slowly added dropwise after stirring reaction into persulfate aqueous solution, drip
After finishing, reaction obtains thickening agent aqueous solution and obtains thickening agent by after the solidification pelletize of described thickening agent aqueous solution, wherein, described work(
Can monomer be one or more of 2- acrylamide-2-methyl propane sulfonic, acrylic acid and dimethyl carbonate；
Described cross-linking agent will stir in slaine addition hot water to dissolving and adding organic ligand reaction to obtain, described
Slaine is the mixture of Borax and zirconium oxychloride, and described organic ligand is in citric acid, acetic acid, triethanolamine and glycerol
One or more；
Described clay stabilizer is to be added to the water clay stabilizer host and clay stabilizer adjuvant to be uniformly mixing to obtain
, described clay stabilizer host is polyquaternary ammonium salt, and described clay stabilizer adjuvant is potassium chloride and/or ammonium chloride；
Cleanup additive host and cleanup additive adjuvant are added to the water and are uniformly mixing to obtain by described cleanup additive, described cleanup additive
Host is fluorocarbon surfactant, and described cleanup additive adjuvant is nonionic surfactant；
Described return discharge opeing and return discharge opeing for what shale gas construction area was fetched.
It is used for an embodiment of the crosslinkable polymeric linear colloid system of shale gas pressure break according to the present invention, described thick
The molecular weight of agent is 800～12,000,000, and degree of hydrolysis is 5～20%.
According to shale gas pressure break of the present invention one embodiment of crosslinkable polymeric linear colloid system, described thickening agent
Preparation process be：Under the protection of noble gases and under 15～20 DEG C of temperature conditionss, in parts by weight, by 20～40 parts
Acrylamide is dissolved in 60～80 parts of deionized waters, adds 10～20 parts of function monomers under agitation；While stirring
While be slowly added dropwise that the persulfate aqueous solution obtain in 10～20 parts of deionized waters is dissolved in by 0.01～0.03 part of potassium peroxydisulfate,
Deca is reacted after 20～30 minutes and is obtained thickening agent aqueous solution in 3～5 hours, described thickening agent aqueous solution is solidified and obtains after pelletize
Thickening agent.
According to shale gas pressure break of the present invention one embodiment of crosslinkable polymeric linear colloid system, with weight portion
Meter, 10～20 parts of slaines is added in the hot water that 50～60 parts of temperature are 60～80 DEG C and stirs 10～20 minutes, treat metal
Salt adds 20～30 parts of organic ligands after being completely dissolved, and obtains described cross-linking agent after continuing reaction 2～4 hours；Wherein, slaine
Middle zirconium oxychloride is 1.5～3 with the mass ratio of Borax：1.
According to shale gas pressure break of the present invention one embodiment of crosslinkable polymeric linear colloid system, with weight portion
Meter, 10～20 parts of clay stabilizer hosts and 5～10 parts of clay stabilizer adjuvant is added in 70～80 parts of water, stirs 30～60
Minute obtains described clay stabilizer.
According to shale gas pressure break of the present invention one embodiment of crosslinkable polymeric linear colloid system, with weight portion
Meter, 10～15 parts of cleanup additive hosts, 5～10 parts of cleanup additive adjuvant is added in 80～90 parts of water, stirring obtains for 30～60 minutes
Described cleanup additive.
Another aspect provides the preparation method with crosslinkable polymeric linear colloid system for the shale gas pressure break,
Described preparation method includes preparing base fluid step and blend step,
Prepare base fluid：Take the discharge opeing of returning of formula ratio, add thickening agent and stir to dissolving, the clay adding formula ratio is steady
Determine agent and cleanup additive, base fluid standby after mix homogeneously, is obtained；
Mixing：In fracturing work, the cross-linking agent of formula ratio is added in described base fluid and obtains described polymeric linear
Colloid system.
According to the shale gas pressure break of the present invention preparation method of crosslinkable polymeric linear colloid system, described base fluid viscous
Spend for 35～45mpa.s, anti-dilative is 88～92%, surface tension is 26～28mN/m；Described polymeric linear colloid system
Crosslinking time is 0.5～2min, and after crosslinking, colloid initial viscosity is 270～295mpa.s.
Compared with prior art, tied up to crosslinkable polymeric linear colloid using the shale gas pressure break of present invention preparation
Return the linear gum base liquid prepared in discharge opeing apply wider low concentration guar gum system to have more at present viscosity is high, cross-linking, frictional resistance
Low, sand washing replaces the good feature of effect, has a good application prospect.After the every section of construction of shale gas staged fracturing terminates, gesture
Substantial amounts of proppant must be left in the wellbore, after heading into the frozen glue after this linear gum base liquid or crosslinking, because its viscosity is higher,
The outstanding sand sand washing effect of base fluid and frozen glue is good, effectively can rinse pit shaft it is ensured that wellbore clean and bridging plug are smoothly below safety
Set.
Specific embodiment
All features disclosed in this specification, or disclosed all methods or during step, except mutually exclusive
Feature and/or step beyond, all can combine by any way.
Any feature disclosed in this specification, unless specifically stated otherwise, all can be equivalent or there is similar purpose by other
Alternative features are replaced.I.e., unless specifically stated otherwise, each feature is a series of equivalent or one of similar characteristics example
?.
First shale gas pressure break of the present invention is described in detail with crosslinkable polymeric linear colloid system below.This
Bright polymeric linear colloid system includes thickening agent, cross-linking agent, clay stabilizer, cleanup additive and returns discharge opeing, wherein, by being thickened
Agent, clay stabilizer, cleanup additive and return discharge opeing composition base fluid crosslinkable polymeric linear is formed by cross-linking agent and this base fluid
Colloid system, and it is applied to the operations such as sand washing in shale gas fracturing reform work progress, replacement, well-flushing.This system is returning discharge opeing
It is good that the linear gum base liquid of middle preparation has the characteristics that viscosity is high, cross-linking, sand washing replaces effect.
According to the exemplary embodiment of the present invention, in parts by weight, described polymeric linear colloid system includes 0.3～0.5
Part thickening agent, 0.3～0.5 portion of clay stabilizer, 0.3～0.5 portion of cleanup additive, 0.2～0.3 part of cross-linking agent and 98.2～98.9 parts
Return discharge opeing,
Specifically, the thickening agent of the present invention is modified polyacrylamide, and the preparation process of this thickening agent is：In noble gases
Protection under, will be soluble in water for acrylamide and add function monomer, be slowly added dropwise into persulfate aqueous solution after stirring reaction,
After completion of dropping, reaction obtains thickening agent aqueous solution and obtains thickening agent, wherein, function by after the solidification pelletize of thickening agent aqueous solution
Monomer is one or more of 2- acrylamide-2-methyl propane sulfonic, acrylic acid and dimethyl carbonate.Preparing above-mentioned thickening
During agent, using aqueous solution polymerization and using potassium peroxydisulfate as initiator, it is embedding that acrylamide and functional monomer copolymerization obtain
Section copolymer synthesizes such thickening agent.This thickening agent can rise viscous, due to introducing in shale gas fracturing outlet liquid well
Functional monomer is modified, and it possesses good salt resistance effect.
According to a preferred embodiment, the preparation process of above-mentioned thickening agent is：Under the protection of noble gases and 15～
Under 20 DEG C of temperature conditionss, in parts by weight, 20～40 parts of acrylamides are dissolved in 60～80 parts of deionized waters, in stirring
Under the conditions of add 10～20 parts of function monomers；Stir and be dissolved in 10 while being slowly added dropwise by 0.01～0.03 part of potassium peroxydisulfate
The persulfate aqueous solution obtaining in～20 parts of deionized waters, Deca is reacted after 20～30 minutes and is obtained thickening agent water in 3～5 hours
Solution, thickening agent aqueous solution is solidified and obtains thickening agent after pelletize.Wherein, above-mentioned noble gases are preferably nitrogen.
The molecular weight of the above-mentioned thickening agent that the present invention prepares is 800～12,000,000, and degree of hydrolysis is 5～20%.
The cross-linking agent of the present invention by slaine add hot water in stir to dissolve and add organic ligand reaction obtain,
Wherein, slaine is the mixture of Borax and zirconium oxychloride, and organic ligand is in citric acid, acetic acid, triethanolamine and glycerol
One or more.Wherein, slaine and organic ligand react generation organic metal salt at a certain temperature, and final reaction obtains
Be organic boron zirconium multiple crosslinking agent.Preferably, in slaine, zirconium oxychloride and the mass ratio of Borax are 1.5～3：1.
Specifically, in parts by weight, 10～20 parts of slaines being added 50～60 parts of temperature is in 60～80 DEG C of hot water
And stir 10～20 minutes, add 20～30 parts of organic ligands after slaine is completely dissolved, obtain after continuing reaction 2～4 hours
To above-mentioned cross-linking agent.
The clay stabilizer of the present invention is to be added to the water clay stabilizer host and clay stabilizer adjuvant to stir
Obtain, wherein, clay stabilizer host is polyquaternary ammonium salt, and clay stabilizer adjuvant is potassium chloride and/or ammonium chloride.Wherein,
The host of clay stabilizer and adjuvant pass through compounding generation cooperative effect, can strengthen its preventive effect of expansion.
Specifically, in parts by weight, 10～20 parts of clay stabilizer hosts and 5～10 parts of clay stabilizer adjuvant are added
In 70～80 parts of water, stirring obtains above-mentioned clay stabilizer in 30～60 minutes.
Cleanup additive host and cleanup additive adjuvant are added to the water and are uniformly mixing to obtain by the cleanup additive of the present invention, wherein,
Cleanup additive host is fluorocarbon surfactant, for example, can be trimerization epoxy HFC-236fa amido propyl betaine, 8-3-9 fluorine
The soft bridge of carbon-to-carbon hydrogen mixes the double quaternary ammonium of chain, trimerization epoxy HFC-236fa amide (2- sulfurous acid) ethyl diformazan sodium etc.；Cleanup additive adjuvant is
Nonionic surfactant, for example, can be NPE, dodecyl phenol polyethenoxy ether etc..Wherein, the row of helping
The host of agent and adjuvant pass through compounding generation cooperative effect, can strengthen its row's of helping effect.
Specifically, in parts by weight, 10～15 parts of cleanup additive hosts, 5～10 parts of cleanup additive adjuvant are added 80～90 parts
In water, stirring obtains above-mentioned cleanup additive in 30～60 minutes.
The discharge opeing of returning that the present invention uses returns discharge opeing for what shale gas construction area was fetched.Wherein, returning discharge opeing is shale gas pressure break
Return discharge opeing, its complicated component is changeable, central containing substantial amounts of calcium ion, magnesium ion, iron ion, chloride ion, polymer breaking glue solution
And other chemical compositions, total salinity about 30000～80000ppm.
The shale gas pressure break that the present invention is obtained ties up to pressure break with crosslinkable polymeric linear colloid and makes in seam, can will be residual
Haydite in the wellbore is stayed to rinse and replace in entrance crack, it is to avoid lower downhole tool that is leading to is subject to because sand washing is not clean
Resistance, has good using effect.
Next above-mentioned shale gas pressure break is carried out specifically with the preparation method of crosslinkable polymeric linear colloid system
Bright.It includes preparing base fluid step and blend step, and wherein, the step preparing base fluid is：Take the discharge opeing of returning of formula ratio, add thick
Agent simultaneously stirs to dissolving, adds clay stabilizer and the cleanup additive of formula ratio, and base fluid standby is obtained after mix homogeneously；Mixed
Closing step is：In fracturing work, the cross-linking agent of formula ratio is pumped into fracturing blender truck agitator tank and adds in described base fluid, gathered
Compound linear glue cross-linking system.
According to one embodiment of present invention, in parts by weight, add 982～989 parts in container to return discharge opeing and open
3～5 parts of thickening agents are subsequently slowly added into return in discharge opeing and stir 30 minutes and dissolve to abundant, add 3～5 parts by stirring
Base fluid standby is obtained after clay stabilizer and 3～5 portions of cleanup additives；In fracturing work, add 2～3 parts of crosslinkings in base fluid
The polymeric linear glue of the operation such as agent the prepared sand washing that can be used in shale gas fracturing reform work progress, replacement, well-flushing
System.
By viscosity being carried out to base fluid and polymeric linear colloid system and the test of cross-linking properties can obtain its main skill
Art parameter.Testing scheme is：Take 60ml base fluid, using RS6000 Haake torque rheometer test base fluid in room temperature, 170S-1Under viscous
Degree；Take 100ml base fluid and add 0.2～0.3ml cross-linking agent with pipet, test crosslinking time simultaneously adopts RS6000 Haake rheology
Instrument test crosslinked gel is in 100 DEG C, 170S-1Under viscosity.
After tested, the shale gas pressure break of the present invention viscosity of base fluid in crosslinkable polymeric linear colloid system be 35～
45mpa.s, anti-dilative is 88～92%, and surface tension is 26～28mN/m；The crosslinking time of described polymeric linear colloid system
For 0.5～2min, after crosslinking, colloid initial viscosity is 270～295mpa.s.
It should be understood that the above-mentioned embodiment of present invention detailed description and following examples are merely to illustrate the present invention rather than limit
The scope of the present invention processed, those skilled in the art made according to the above of the present invention some nonessential improve and adjust
Whole belong to protection scope of the present invention.In following embodiments, specific parameter etc. is also only one of OK range example,
I.e. those skilled in the art can be done in suitable scope by the explanation of this paper and select, and do not really want to be defined in Examples below
In concrete numerical value and concrete steps.
In order that the purpose of the present invention, technical scheme and effect are more specific clear, below by the preferred reality to the present invention
Apply example to be described in detail.
Embodiment 1：
Under nitrogen protection and under 15 DEG C of temperature conditionss, in parts by weight, 30 parts of acrylamides are dissolved in 50 parts
In deionized water, add 10 parts of 2- acrylamide-2-methyl propane sulfonics under agitation；Stir while be slowly added dropwise by
0.01 part of potassium peroxydisulfate is dissolved in the persulfate aqueous solution obtain in 10 parts of deionized waters, and Deca reacts 4 after finishing within 30 minutes
Hour obtains thickening agent aqueous solution, thickening agent aqueous solution is solidified and obtains thickening agent after pelletize.
10 parts of zirconium oxychlorides and 5 parts of Boraxs are added to stir in 65 parts of water and is warming up to after 65 DEG C to dissolving, and add 20
The organic boron zirconium multiple crosslinking agent that part triethanolamine obtains after reacting 3h.
10 parts of polyquaternary ammonium salt and 10 parts of potassium chloride are added in 80 parts of water, stirring obtains clay stabilizer in 60 minutes.
10 parts of trimerization epoxy HFC-236fa amido propyl betaines and 5 parts of NPEs are added 85 parts of water
In, stirring obtains clay stabilizer in 30 minutes.
98.9 parts are returned discharge opeing, 0.3 portion of above-mentioned thickening agent, 0.3 portion of above-mentioned clay stabilizer, 0.3 portion of above-mentioned cleanup additive are joined
Base fluid processed, then add 0.2 part of above-mentioned cross-linking agent to carry out being cross-linked to form frozen glue in this base fluid.Base fluid in the present embodiment and frozen glue
Technical parameter such as table 1 below.
The technical parameter of base fluid and frozen glue in table 1 embodiment 1
Embodiment 2：
Under nitrogen protection and under 18 DEG C of temperature conditionss, in parts by weight, 40 parts of acrylamides are dissolved in 40 parts
In deionized water, add 10 parts of acrylic acid under agitation；Stir while being slowly added dropwise molten by 0.015 part of potassium peroxydisulfate
The persulfate aqueous solution that solution obtains in 10 parts of deionized waters, reaction after Deca finishes for 30 minutes obtains thickening agent water in 4 hours
Solution, thickening agent aqueous solution is solidified and obtains thickening agent after pelletize.
12 parts of zirconium oxychlorides and 8 parts of Boraxs are added to stir in 60 parts of water and is warming up to after 65 DEG C to dissolving, and add 20
The organic boron zirconium multiple crosslinking agent obtaining after part citric acid reactions 3h.
10 parts of polyquaternary ammonium salt and 10 parts of potassium chloride are added in 80 parts of water, stirring obtains clay stabilizer in 60 minutes.
12 parts of soft mixed double quaternary ammoniums of chain of bridge of 8-3-9 fluorine carbon-to-carbon hydrogen and 3 parts of dodecyl phenol polyethenoxy ethers are added 85 parts of water
In, stirring obtains clay stabilizer in 30 minutes.
98.4 parts are returned discharge opeing, 0.3 portion of above-mentioned thickening agent, 0.5 portion of above-mentioned clay stabilizer, 0.5 portion of above-mentioned cleanup additive are joined
Base fluid processed, then add 0.3 part of above-mentioned cross-linking agent to carry out being cross-linked to form frozen glue in this base fluid.Base fluid in the present embodiment and frozen glue
Technical parameter such as table 2 below.
The technical parameter of base fluid and frozen glue in table 2 embodiment 2
Embodiment 3：
Under nitrogen protection and under 20 DEG C of temperature conditionss, in parts by weight, 35 parts of acrylamides are dissolved in 40 parts
In deionized water, add 15 parts of dimethyl carbonate under agitation；Stir while being slowly added dropwise by 0.02 part of persulfuric acid
Potassium is dissolved in the persulfate aqueous solution obtain in 10 parts of deionized waters, and Deca is reacted after finishing within 30 minutes and is thickened for 4 hours
Agent aqueous solution, thickening agent aqueous solution is solidified and obtains thickening agent after pelletize.
15 parts of zirconium oxychlorides and 5 parts of Boraxs are added to stir in 60 parts of water and is warming up to after 65 DEG C to dissolving, and add 20
The organic boron zirconium multiple crosslinking agent that part glycerol obtains after reacting 3h.
10 parts of polyquaternary ammonium salt and 10 parts of ammonium chloride are added in 80 parts of water, stirring obtains clay stabilizer in 60 minutes.
10 parts of trimerization epoxy HFC-236fa amide (2- sulfurous acid) ethyl diformazan sodium and 5 parts of NPEs are added
Enter in 85 parts of water, stirring obtains clay stabilizer in 30 minutes.
98.4 parts are returned discharge opeing, 0.5 portion of above-mentioned thickening agent, 0.3 portion of above-mentioned clay stabilizer, 0.5 portion of above-mentioned cleanup additive are joined
Base fluid processed, then add 0.3 part of above-mentioned cross-linking agent to carry out being cross-linked to form frozen glue in this base fluid.Base fluid in the present embodiment and frozen glue
Technical parameter such as table 3 below.
The technical parameter of base fluid and frozen glue in table 3 embodiment 3
In sum, tied up to crosslinkable polymeric linear colloid using the shale gas pressure break of present invention preparation and return discharge opeing
The linear gum base liquid of middle preparation applies wider low concentration guar gum system to have more at present, and viscosity is high, cross-linking, frictional resistance is low, sand washing
Replace the good feature of effect, have a good application prospect.After the every section of construction of shale gas staged fracturing terminates, will certainly be in well
Substantial amounts of proppant is left in cylinder, after heading into the frozen glue after this linear gum base liquid or crosslinking, because its viscosity is higher, base fluid and jelly
The outstanding sand sand washing effect of glue is good, effectively can rinse pit shaft it is ensured that wellbore clean and bridging plug smoothly set below safety.
The invention is not limited in aforesaid specific embodiment.The present invention expands to and any discloses in this manual
New feature or any new combination, and the arbitrary new method of disclosure or the step of process or any new combination.
Claims (8)
1. a kind of shale gas pressure break with crosslinkable polymeric linear colloid system it is characterised in that in parts by weight, described polymerization
Thing linear colloid system include 0.3～0.5 part of thickening agent, 0.3～0.5 portion of clay stabilizer, 0.3～0.5 portion of cleanup additive, 0.2～
0.3 part of cross-linking agent and 98.2～98.9 parts return discharge opeing,
Described thickening agent is that the preparation process of modified polyacrylamide and described thickening agent is：Under the protection of noble gases,
Will be soluble in water for acrylamide and add function monomer, it is slowly added dropwise after stirring reaction into persulfate aqueous solution, completion of dropping
Reaction obtains thickening agent aqueous solution and obtains thickening agent by after the solidification pelletize of described thickening agent aqueous solution afterwards, wherein, described function
Monomer is one or more of 2- acrylamide-2-methyl propane sulfonic, acrylic acid and dimethyl carbonate；
Described cross-linking agent by slaine add hot water in stir to dissolve and add organic ligand reaction obtain, described metal
Salt is the mixture of Borax and zirconium oxychloride, and described organic ligand is one of citric acid, acetic acid, triethanolamine and glycerol
Or it is multiple；
Clay stabilizer host and clay stabilizer adjuvant are added to the water and are uniformly mixing to obtain by described clay stabilizer, institute
Stating clay stabilizer host is polyquaternary ammonium salt, and described clay stabilizer adjuvant is potassium chloride and/or ammonium chloride；
Cleanup additive host and cleanup additive adjuvant are added to the water and are uniformly mixing to obtain by described cleanup additive, described cleanup additive host
For fluorocarbon surfactant, described cleanup additive adjuvant is nonionic surfactant；
Described return discharge opeing and return discharge opeing for what shale gas construction area was fetched.
2. according to claim 1 for shale gas pressure break with crosslinkable polymeric linear colloid system it is characterised in that
The molecular weight of described thickening agent is 800～12,000,000, and degree of hydrolysis is 5～20%.
3. according to claim 2 shale gas pressure break with crosslinkable polymeric linear colloid system it is characterised in that described thick
The preparation process of agent is：Under the protection of noble gases and under 15～20 DEG C of temperature conditionss, in parts by weight, by 20～
40 parts of acrylamides are dissolved in 60～80 parts of deionized waters, add 10～20 parts of function monomers under agitation；While stirring
Mix, while being slowly added dropwise, the potassium peroxydisulfate water obtain in 10～20 parts of deionized waters is dissolved in by 0.01～0.03 part of potassium peroxydisulfate
Solution, Deca is reacted after 20～30 minutes and is obtained thickening agent aqueous solution in 3～5 hours, and described thickening agent aqueous solution is solidified pelletize
After obtain thickening agent.
4. according to claim 1 shale gas pressure break with crosslinkable polymeric linear colloid system it is characterised in that with weight
Part meter, 10～20 parts of slaines is added in the hot water that 50～60 parts of temperature are 60～80 DEG C and stirs 10～20 minutes, treat gold
Belong to after salt is completely dissolved and add 20～30 parts of organic ligands, after continuing reaction 2～4 hours, obtain described cross-linking agent；Wherein, metal
In salt, zirconium oxychloride and the mass ratio of Borax are 1.5～3：1.
5. according to claim 1 shale gas pressure break with crosslinkable polymeric linear colloid system it is characterised in that with weight
Part meter, 10～20 parts of clay stabilizer hosts and 5～10 parts of clay stabilizer adjuvant are added in 70～80 parts of water, and stirring 30～
Obtain described clay stabilizer within 60 minutes.
6. according to claim 1 shale gas pressure break with crosslinkable polymeric linear colloid system it is characterised in that with weight
Part meter, 10～15 parts of cleanup additive hosts, 5～10 parts of cleanup additive adjuvant is added in 80～90 parts of water, stirring obtains for 30～60 minutes
To described cleanup additive.
7. the preparation method of crosslinkable polymeric linear colloid system of shale gas pressure break described in claim 1 to 6, its feature
It is, described preparation method includes preparing base fluid step and blend step,
Prepare base fluid：Take the discharge opeing of returning of formula ratio, add thickening agent and stir to dissolving, add the clay stabilizer of formula ratio
And cleanup additive, base fluid standby is obtained after mix homogeneously；
Mixing：In fracturing work, the cross-linking agent of formula ratio is added in described base fluid and obtains described polymeric linear colloid
System.
8. the shale gas pressure break preparation method of crosslinkable polymeric linear colloid system according to claim 7, its feature
It is, the viscosity of described base fluid is 35～45mpa.s, and anti-dilative is 88～92%, and surface tension is 26～28mN/m；Described poly-
The crosslinking time of compound linear colloid system is 0.5～2min, and after crosslinking, colloid initial viscosity is 270～295mpa.s.
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