CN103881687B - A kind of instant modified cellulose crosslinking clean fracturing fluid and preparation method thereof - Google Patents
A kind of instant modified cellulose crosslinking clean fracturing fluid and preparation method thereof Download PDFInfo
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- CN103881687B CN103881687B CN201410088243.5A CN201410088243A CN103881687B CN 103881687 B CN103881687 B CN 103881687B CN 201410088243 A CN201410088243 A CN 201410088243A CN 103881687 B CN103881687 B CN 103881687B
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Abstract
The present invention relates to a kind of instant modified cellulose crosslinking clean fracturing fluid.This instant modified cellulose crosslinking clean fracturing fluid consists of the following composition: FAG 500 type modified cellulose 0.2 0.6 weight portion, FAZ 1 type thickening initiator 0.1 0.5 weight portion, DL 16 type cleanup additive 0.3 0.7 weight portion, FAJ 305 type cross-linking regulator 0.5 1.2 weight portion, FAC 201 type polarity chelating class organic zirconium crosslinker 0.2 0.7 weight portion, NBA 102 type capsule breaker 0.002 0.07 weight portion, water 100 weight portion.Present invention also offers the preparation method of above-mentioned instant modified cellulose crosslinking clean fracturing fluid.The performance of instant modified cellulose fracturing fluid provided by the present invention is better than conventional fracturing fluid system, have instant, heatproof, resistant to shearing, fragile glue, without residue, eco-friendly advantage, can be used for low permeability oil and gas field, the most easily injure in the pressure break exploitation of reservoir.
Description
Technical field
The present invention relates to instant modified cellulose crosslinking clean fracturing fluid and the preparation side thereof of a kind of oil-gas reservoir fracturing yield increasing
Method, belongs to technical field of petroleum extraction.
Background technology
Fracturing technique quickly grows as Main Yield-increasing, the augmented injection method of low permeability reservoirs.Fracturing fluid is the weight of fracturing technique
Want ingredient, conventional for aqueous fracturing fluid both at home and abroad, account for more than 80%.Aqueous fracturing fluid, with water as medium, adds
Fracturing fluid gelatinizer, antibacterial, clay stabilizer, pH value regulator, demulsifier, cleanup additive, cross-linking agent, broken glue
The additive such as agent, temperature stability agent, fracturing fluid gelatinizer is host, mostly is plant gum (such as guar gum, fenugreek gum, field
Cyanines glue and derivant thereof), the polymer substance such as synthetic polymer (such as polyacrylamide).Plant gum has good
Water solublity and tackifying ability, it is necessary to add antibacterial, based on alkaline medium, can crosslink effect with cross-linking agent and be formed
Three-dimensional net structure；But this kind of thickening agent has the water-insoluble of 10-20%, even if by, after chemical modification, remaining on
There is 2-8% insoluble matter, fracturing fluid formed therewith, through there is the residue of 100-500mg/l after breaking gel, is detained stratum,
Blocking duct, causes formation damage.CN102676146A discloses a kind of fracturing fluid, and its weight percentages of components is:
0.25-0.6% super guanidine gum, 0.5-2% potassium chloride, 0.5-1.0% organic clay stabilizers；0.05-0.1%JA-1 sterilization and anticorrosion
Agent, 0.2-0.5% nonionic cleanup additive, 0.1-0.2% cross-linking regulator, 0.0001-0.15% Ammonium persulfate., 0.2-0.6%
Organic boron zirconium multiple crosslinking agent, remaining is water.Obviously, the fracturing fluid disclosed in this application is the most conventional allusion quotation
Type guar gum fracturing fluid formula system, alkaline solution medium, need sterilization and anticorrosion, organic boron zirconium composite crosslinking, exist relatively
The thickening agent water-insoluble of high-load and fracturing liquid rubber-breaking residue.
Synthetic polymer hydrofracturing fluid is with polynary monomer copolymerization macromolecule as thickening agent, and that joins adjusts with clay stabilizer, pH value
The joint additive such as agent, demulsifier, cleanup additive, cross-linking agent, gel breaker, temperature stability agent, has without water-insoluble and low
The feature of residue, but owing to polymer molecular weight reaches 1000-2000 ten thousand, the delay of macromole and cull can not drop automatically
Solution is that it is not enough, and delay can cause degradation under obvious stratum and the injury of supporting crack, in-place permeability, have a strong impact on
Oil and gas production.CN102634329A discloses a kind of fracturing fluid, and its weight percentages of components is: XT-3 low molecule is polymerized
Thing thickening agent, 0.25-0.6%；Cross-linking agent, 0.2-0.6%；Potassium chloride, 0.5-2%；Cross-linking regulator, 0.02-0.08%；
Cleanup additive: 0.2-0.5%；Ammonium persulfate., 0.0001-0.15%；Remaining is water.This fracturing fluid have employed aluminium salt and zirconates
Double ion crosslinking synthetic polymer, and add potassium chloride as clay stabilizer, do not introduce polymer molecular weight and clay is steady
Determine performance comparison.
Low molecular viscoelastic surfactant fracturing fluid (VES) is the important supplement of aqueous fracturing fluid, has cleaning nothing
The feature of residue, is typical low infringement fracturing fluid, but due to non-crosslinkable, temperature resistant capability is poor, filter loss big with become
This high deficiency limits its sizable application.Slippery water fracturing fluid is as unconventionaloil pool exploitation and develops low cost, low
Viscosity aqueous fracturing fluid, is made up of drag reducer, antibacterial, cleanup additive and gel breaker etc., have low frictional resistance, low residue and
The feature of low infringement, but there is also do not cross-link, low viscosity and prop-carrying capacity difference etc. deficiency.Therefore, exploitation a kind of without residue,
Cleaning, crosslinkable fracturing fluid are the urgent needss of Low permeable oil and gas reservoirs Efficient Development.
Cellulose is the natural resources that nature is widely present, and by chemical modification other additive supporting, can be formed
Another kind of low infringement fracturing fluid new system.CN103160269A provides a kind of water base guanidine gum fracturing fluid, belongs to oil field pressure
Split technical field.Described water base guanidine gum fracturing fluid includes following component: guanidine gum derivative, cross-linking agent, gel breaker, thickening
Agent, pH value regulator and water.Crucial thickening agent in this invention is the use of the modified cellulose of 0.5-2.0wt%
(HEC, CMC, HPC), substitutes guar gum thickening agent with the modified cellulose of the high concentration not cross-linked, reduces modification
The concentration of guar gum, reduces water base guanidine gum fracturing fluid residue content after breaking gel and the purpose of cost.It is clear that
This fracturing fluid system is the modified cellulose of the non-crosslinked characteristic being up to 2wt% by concentration, reduces guar gum
Concentration, with alkaline solution medium (pH is as 9-10), with Inorganic Boron (Borax), as cross-linking agent, (crosslinking is Guar
Glue, rather than modified cellulose), reach auxiliary thickening and take sand and reduce the purpose of residue, modified cellulose only plays increase table
See viscous effect.The experimental data of this patent shows simultaneously, and the minimum level of residue of fracturing fluid is 0.2%, i.e. 2000mg/L, and
Non-low residue fracturing fluid.
The compound method of plant gum fracturing fluid requires different and variant, particularly non-because of thickening agent characteristic with pressing crack construction
During conventional gas and oil massive hydraulic fracturing, instant, preparation simplicity is the Production requirement of oil-gas field fracturing, its developing direction especially.
CN102634329A and CN102676146A describes synthetic polymer and guar gum fracturing fluid compound method, all
Being under the dynamic condition of huge discharge circulation, first regulate pH value, salt adding is dissolved, and relies on thickening agent (powder) self
Hydration, slowly dissolves thickening, and laboratory needs the mixing time of 10-15min, and the every 40m of mining site3Tank with greater need for
The liquid preparation time of 40-50min.Obviously, material category is many, need circulation power in the dosing method interpolation that this mining site is conventional
Greatly, liquid preparation time is long, it is difficult to meets unconventionaloil pool and hides the needs that massive hydraulic fracture is instant.
Summary of the invention
In order to solve routine, there is water-insoluble in thickening agent, fracturing fluid exists a large amount of residue and infringement serious, and preparation circulation
The technical problems such as time length, it is an object of the invention to provide one and are different from conventional plant glue (guar gum), synthesize and gather
The instant modified cellulose crosslinking clean fracturing fluid of compound and viscoelastic surfactant (VES), has ratio by employing
Fracturing fluid usually prepared by the general fibre more preferable hydrophilic fiber of element, and is equipped with thickening elicitation technique and chelation crosslinking skill
Art, makes fracturing fluid realize instant, quickly viscosifies, and can postpone to be cross-linked to form frozen glue, have higher prop-carrying capacity and heatproof
Ability.
For reaching above-mentioned purpose, the invention provides a kind of instant modified cellulose crosslinking clean fracturing fluid, this instant modification
Cellulose crosslinked clean fracturing fluid consists of the following composition:
FAG-500 type modified cellulose 0.2-0.6 weight portion, FAZ-1 type thickening initiator 0.1-0.5 weight portion, DL-16
Type cleanup additive 0.3-0.7 weight portion, FAJ-305 type cross-linking regulator 0.5-1.2 weight portion, FAC-201 type polarity chelate
Class organic zirconium crosslinker 0.2-0.7 weight portion, NBA-102 type capsule breaker 0.002-0.07 weight portion, water 100 weight
Amount part.
The above-mentioned instant modified cellulose crosslinking clean fracturing fluid that the present invention provides need not add antibacterial and clay stabilization
Agent, just has good shelf-stability and suppression hydration and expansion of clay ability.
In above-mentioned instant modified cellulose crosslinking clean fracturing fluid, the modified cellulose used is that anionic modification is fine
Dimension element, viscosity-average molecular weight is 600000-700000, and it is that a kind of etherificate adds grafting modified cellulose, than commonly
Cellulose has more preferable hydrophilic and temperature resistant capability, is added in fracturing fluid and fracturing fluid can be made to form frozen glue, improve it
Prop-carrying capacity；Preferably, above-mentioned modified cellulose is the FAG-500 type that Beijing Jinlin Petroleum Technology Co., Ltd. produces
Modified cellulose.
In above-mentioned instant modified cellulose crosslinking clean fracturing fluid, the thickening initiator used is that one can improve fibre
Tie up element hydrophilic in water, the aquation of accelerating fibers element, the additive of thickening；Preferably, the thickening used causes
Agent is the FAZ-1 type thickening initiator that Wanke Petroleum & Natural-Gas Technical Engineering Co., Ltd., Langfang City produces.
In above-mentioned instant modified cellulose crosslinking clean fracturing fluid, the cleanup additive used is for anion surfactant
It is main supporting additive with nonionic surfactant；Preferably, above-mentioned cleanup additive is Langfang City Wanke petroleum gas
The DL-16 type cleanup additive (cleanup additive DL-6) that engineering company limited produces.The master of described DL-16 type cleanup additive
Wanting composition is polyoxyethylated alkyl phenol sulphate anion surface active agent and polyoxyethylated alkyl phenol non-ionic surface
The mixture of activating agent, wherein, by weight percentage, polyoxyethylated alkyl phenol sulphate anion surface active agent
Percentage composition be 15%-50%, the percentage composition of polyoxyethylated alkyl phenol nonionic surfactant is 45%-10%,
Remaining is water；Preferably, described polyoxyethylated alkyl phenol sulphate anion surface active agent and polyoxyethylene alkylphenol
The mass ratio of ether nonionic surfactant is 3:2.
In above-mentioned instant modified cellulose crosslinking clean fracturing fluid, the cross-linking regulator used is organic monoacid composition
Additive, the main crosslinking environment providing this instant modified cellulose to cross-link clean fracturing fluid, regulation crosslinking time and raising
Temperature resistant capability；Preferably, above-mentioned cross-linking regulator is that the FAJ-305 type crosslinking that Hua You Cologne, Beijing development company produces is adjusted
Joint agent.The main component of described FAJ-305 type cross-linking regulator is the mixture of acetic acid and formic acid, wherein, with weight hundred
Proportion by subtraction meter, the percentage composition of formic acid is 25%-50%, and the percentage composition of acetic acid is 45%-20%, and remaining is water；More excellent
The mass ratio of selection of land, formic acid and acetic acid is 1:1-3:1.
In above-mentioned instant modified cellulose crosslinking clean fracturing fluid, the polarity chelating class organic zirconium crosslinker used is logical
Cross C2-C7The organic zirconium crosslinker of pluripolarity long short chain chelating agen synthesis；Preferably, above-mentioned polarity chelating class organic zirconium is handed over
Connection agent is the FAC-201 type polarity chelating class organic zirconium crosslinker that Hua You Cologne, Beijing development company produces.
Above-mentioned instant modified cellulose crosslinking clean fracturing fluid in, described gel breaker be capsule breaker, potassium peroxydisulfate,
The combination of one or more in sodium peroxydisulfate and Ammonium persulfate., it is preferable that above-mentioned capsule breaker is Hua You Cologne, Beijing
The NBA-102 type capsule breaker that development company produces.
The preparation method that present invention also offers above-mentioned instant modified cellulose crosslinking clean fracturing fluid is " first to disperse, increase afterwards
Viscous, then cross-link ", it comprises the following steps:
Step one: under agitation, be sequentially added in water FAG-500 type modified cellulose, FAZ-1 type thickening draw
Send out agent, then stir 3min, obtain the cellulose aqueous solution of thickening；
Step 2: under agitation, is sequentially added into DL-16 type cleanup additive, FAJ-305 in above-mentioned cellulose aqueous solution
Type cross-linking regulator, is uniformly mixed formation instant modified cellulose crosslinking clean fracturing fluid base fluid；
Step 3: during fracturing work, under agitation, to above-mentioned instant modified cellulose crosslinking cleaning pressure
Split and liquid-based liquid be sequentially added into NBA-102 type capsule breaker, FAC-201 type polarity chelating class organic zirconium crosslinker,
Obtain the instant modified cellulose crosslinking clean fracturing fluid of frozen glue shape.
Each one-tenth of instant modified cellulose provided by the present invention crosslinking clean fracturing fluid is grouped into and is not blended in one in advance
Rise, mix during fracturing work, first by modified cellulose, to be mixed to get cellulose water-soluble for thickening initiator
Liquid, then adds cleanup additive, cross-linking regulator obtains base fluid, then further according to actual job need to add gel breaker,
Cross-linking agent.The preparation process of this fracturing fluid and fracturing work are bound together.
Instant modified cellulose provided by the present invention crosslinking clean fracturing fluid be a kind of cross-link in acid condition to change
Property cellulose is the novel water-based fracturing fluid of thickening agent.Fiber have the strongest intramolecular and intermolecular hydrogen bonding effect so that it is
It is difficult to be dissolved in water and other organic solvents.Cellulose in this cellulose crosslinked clean fracturing fluid adds grafting by etherificate
Learn reaction introducing substituent group and destroy its stronger hydrogen bond action, improve its hydrophilic, the especially dissolving in aqueous medium.
This instant modified cellulose crosslinking clean fracturing fluid polarity to be used chelating class organic zirconium crosslinker, this organic zirconium crosslinker
In water, complexation and repeatedly hydrolysis, ol bridge effect produce positively charged polynuclear hydroxy bridge complex ion, and polynuclear hydroxy bridge complex ion leads to
Cross and form polar bond with the group such as the carboxyl in cellulose and amide groups and coordination is strong and produce crosslinking, formation crosslinked gel,
Improve the prop-carrying capacity of instant modified cellulose crosslinking clean fracturing fluid.
The performance of instant modified cellulose fracturing fluid provided by the present invention is better than conventional fracturing fluid system, has both inherited routine
The cross-linking characteristic of guar gum fracturing fluid, overcomes again the shortcoming that guar gum contains a large amount of residue；Both viscoelasticity table had been passed on
Face activating agent fracturing fluid (VES) cleaning, without the advantage of residue, turn avoid concentration non-crosslinkable for VES high and viscous
The defect of degree difference.After tested, this instant modified cellulose crosslinking clean fracturing fluid has instant, heatproof resistant to shearing, fragile
Glue, without residue, advantages of environment protection, can be used for low permeability oil and gas field, the most easily injure reservoir pressure break exploitation in.
Accompanying drawing explanation
Fig. 1 is the instant curve of variable concentrations cellulose crosslinked clean fracturing fluid base fluid；
Fig. 2 is 90 DEG C of heatproof resistant to shearing curves of the instant modified cellulose crosslinking clean fracturing fluid of embodiment 3；
Fig. 3 is 120 DEG C of heatproof resistant to shearing curves of the instant modified cellulose crosslinking clean fracturing fluid of embodiment 5.
Detailed description of the invention
In order to the technical characteristic of the present invention, purpose and beneficial effect are more clearly understood from, the existing technology to the present invention
Scheme carries out described further below, but it is not intended that to the present invention can the restriction of practical range.
Embodiment 1
Present embodiments providing a kind of instant modified cellulose crosslinking clean fracturing fluid, it comprises the following ingredients:
FAG-500 type modified cellulose, 0.2 weight portion；FAZ-1 type thickening initiator, 0.15 weight portion；DL-16
Type cleanup additive, 0.3 weight portion；FAJ-305 type cross-linking regulator, 1.0 weight portions；FAC-201 type polarity chelating class has
Machine zirconium crosslink agent, 0.35 weight portion；NBA-102 type capsule breaker, 0.007 weight portion；Water, 100 weight portions.
This instant modified cellulose crosslinking clean fracturing fluid is prepared according to following steps:
Step one: under agitation, be sequentially added in water FAG-500 type modified cellulose, FAZ-1 type thickening draw
Send out agent, then stir 3min, obtain cellulose aqueous solution；
Step 2: under agitation, is sequentially added into DL-16 type cleanup additive, FAJ-305 in above-mentioned cellulose aqueous solution
Type cross-linking regulator, is uniformly mixed formation instant modified cellulose crosslinking clean fracturing fluid base fluid；
Step 3: under agitation, is sequentially added in above-mentioned instant modified cellulose crosslinking clean fracturing fluid base fluid
NBA-102 type capsule breaker, FAC-201 type polarity chelating class organic zirconium crosslinker, obtains instant modified cellulose and hands over
Connection clean fracturing fluid frozen glue.
This instant modified cellulose crosslinking clean fracturing fluid can apply to the pressing crack construction of 70 DEG C of wells.
Embodiment 2
Present embodiments providing a kind of instant modified cellulose crosslinking clean fracturing fluid, it comprises the following ingredients:
FAG-500 type modified cellulose, 0.25 weight portion；FAZ-1 type thickening initiator, 0.15 weight portion；DL-16
Type cleanup additive, 0.3 weight portion；FAJ-305 type cross-linking regulator, 1.0 weight portions；FAC-201 type polarity chelating class has
Machine zirconium crosslink agent, 0.4 weight portion；NBA-102 type capsule breaker, 0.006 weight portion；Water, 100 weight portions.
This instant modified cellulose crosslinking clean fracturing fluid is prepared according to following steps:
Step one: under agitation, be sequentially added in water FAG-500 type modified cellulose, FAZ-1 type thickening draw
Send out agent, then stir 3min, obtain cellulose aqueous solution；
Step 2: under agitation, is sequentially added into DL-16 type cleanup additive, FAJ-305 in above-mentioned cellulose aqueous solution
Type cross-linking regulator, is uniformly mixed formation instant modified cellulose crosslinking clean fracturing fluid base fluid；
Step 3: under agitation, is sequentially added in above-mentioned instant modified cellulose crosslinking clean fracturing fluid base fluid
NBA-102 type capsule breaker, FAC-201 type polarity chelating class organic zirconium crosslinker, obtains instant modified cellulose and hands over
Connection clean fracturing fluid frozen glue.
This instant modified cellulose crosslinking clean fracturing fluid can apply to the pressing crack construction of 80 DEG C of wells.
Embodiment 3
Present embodiments providing a kind of instant modified cellulose crosslinking clean fracturing fluid, it comprises the following ingredients:
FAG-500 type modified cellulose, 0.3 weight portion；FAZ-1 type thickening initiator, 0.2 weight portion；DL-16 type
Cleanup additive, 0.3 weight portion；FAJ-305 type cross-linking regulator, 1.0 weight portions；FAC-201 type polarity chelating class is organic
Zirconium crosslink agent, 0.5 weight portion；NBA-102 type capsule breaker, 0.005 weight portion；Water, 100 weight portions.
This instant modified cellulose crosslinking clean fracturing fluid is prepared according to following steps:
Step one: under agitation, be sequentially added in water FAG-500 type modified cellulose, FAZ-1 type thickening draw
Send out agent, then stir 3min, obtain cellulose aqueous solution；
Step 2: under agitation, is sequentially added into DL-16 type cleanup additive, FAJ-305 in above-mentioned cellulose aqueous solution
Type cross-linking regulator, is uniformly mixed formation instant modified cellulose crosslinking clean fracturing fluid base fluid；
Step 3: under agitation, is sequentially added in above-mentioned instant modified cellulose crosslinking clean fracturing fluid base fluid
NBA-102 type capsule breaker, FAC-201 type polarity chelating class organic zirconium crosslinker, obtains instant modified cellulose and hands over
Connection clean fracturing fluid frozen glue.
This instant modified cellulose crosslinking clean fracturing fluid can apply to the pressing crack construction of 90 DEG C of wells.
Embodiment 4
Present embodiments providing a kind of instant modified cellulose crosslinking clean fracturing fluid, it comprises the following ingredients:
FAG-500 type modified cellulose, 0.4 weight portion；FAZ-1 type thickening initiator, 0.20 weight portion；DL-16
Type cleanup additive, 0.3 weight portion；FAJ-305 type cross-linking regulator, 0.9 weight portion；FAC-201 type polarity chelating class has
Machine zirconium crosslink agent, 0.5 weight portion；NBA-102 type capsule breaker, 0.003 weight portion；Water, 100 weight portions.
This instant modified cellulose crosslinking clean fracturing fluid is prepared according to following steps:
Step one: under agitation, is sequentially added into cellulose FAG-500, FAZ-1 type thickening initiator in water,
Then stir 3min, obtain cellulose aqueous solution；
Step 2: under agitation, is sequentially added into DL-16 type cleanup additive, FAJ-305 in above-mentioned cellulose aqueous solution
Type cross-linking regulator, is uniformly mixed formation instant modified cellulose crosslinking clean fracturing fluid base fluid；
Step 3: under agitation, is sequentially added in above-mentioned instant modified cellulose crosslinking clean fracturing fluid base fluid
NBA-102 type capsule breaker, FAC-201 type polarity chelating class organic zirconium crosslinker, obtains instant modified cellulose and hands over
Connection clean fracturing fluid frozen glue.
This instant modified cellulose crosslinking clean fracturing fluid can apply to the pressing crack construction of 100-110 DEG C of well.
Embodiment 5
Present embodiments providing a kind of instant modified cellulose crosslinking clean fracturing fluid, it comprises the following ingredients:
FAG-500 type modified cellulose, 0.6 weight portion；FAZ-1 type thickening initiator, 0.20 weight portion；DL-16
Type cleanup additive, 0.7 weight portion；FAJ-305 type cross-linking regulator, 0.9 weight portion；FAC-201 type polarity chelating class has
Machine zirconium crosslink agent, 0.6 weight portion；NBA-102 type capsule breaker, 0.003 weight portion；Water, 100 weight portions.
This instant modified cellulose crosslinking clean fracturing fluid is prepared according to following steps:
Step one: under agitation, is sequentially added into cellulose FAG-500, FAZ-1 type thickening initiator in water,
Then stir 3min, obtain cellulose aqueous solution；
Step 2: under agitation, is sequentially added into DL-16 type cleanup additive, FAJ-305 in above-mentioned cellulose aqueous solution
Type cross-linking regulator, is uniformly mixed formation instant modified cellulose crosslinking clean fracturing fluid base fluid；
Step 3: under agitation, is sequentially added in above-mentioned instant modified cellulose crosslinking clean fracturing fluid base fluid
NBA-102 type capsule breaker, FAC-201 type polarity chelating class organic zirconium crosslinker, obtains instant modified cellulose and hands over
Connection clean fracturing fluid frozen glue.
This instant modified cellulose crosslinking clean fracturing fluid can apply to the pressing crack construction of 120-130 DEG C of well.
Test example 1
The instant modified cellulose crosslinking clean fracturing fluid base fluid that this test prepares for detecting embodiment 1-5 is 20
Minute interior apparent viscosity change.The equipment that measurement apparent viscosity is used is six speed rotating cylinder viscometers, and result of the test is shown in Table
1 and Fig. 1.Table 1 is that the instant modified cellulose crosslinking clean fracturing fluid base fluid of the cellulose preparation of variable concentrations is in difference
Apparent viscosity after swelling time.
Table 1
Note: the consumption of FAG-500 type modified cellulose refers to the consumption relative to 100 weight parts waters.
It will be seen from figure 1 that instant modified cellulose crosslinking clean fracturing fluid base fluid prepared by embodiment 1-5 was at 3 minutes
Interior more than the 94% of the final viscosity that just can reach, and final viscosity is big than frequently seen plants fracturing fluid, and (embodiment 1-5 carries
Instant modified cellulose crosslinking clean fracturing fluid final apparent viscosity after swelling and hydroxypropyl guar gum, the carboxymethyl melon of confession
Peptization, super guar gum be swelling and the fracturing fluid of four kinds of frequently seen plants glue preparations of cellulose final apparent viscosity pair after swelling
Ratio is shown in Table 2).Modified cellulose fracturing fluid base fluid prepared by this test explanation embodiment 1-5 can quickly rise viscous and reach very
High final viscosity.Instant and the high viscosity characteristic of the instant modified cellulose crosslinking clean fracturing fluid base fluid of embodiment 1-5
Enable instant modified cellulose crosslinking clean fracturing fluid to realize online mixture, factory operation when construction, and be used as pressure
Split the hydraulic fluid of liquid application work.
The fracturing fluid base fluid of table 2 different plant gum concentration preparation final apparent viscosity after swelling
| Plant gum concentration | 0.2 | 0.25 | 0.3 | 0.4 | 0.6 |
| Hydroxypropyl guar gum | 15 | 21 | 27 | 42 | 81 |
| Carboxymethyl guar gum | 12 | 21 | 30 | 42 | 84 |
| Super guar gum | 18 | 25 | 30 | 45 | 81 |
| Cellulose is swelling | 28.5 | 40.5 | 52.5 | 78.0 | 121.5 |
Plant gum concentration in table 2 refers to: plant gum addition in 100 weight parts waters, and unit is weight portion.
Given numerical value be swelling after final apparent viscosity, unit is mPa s.
Test example 2
The heatproof resistant to shearing of the instant modified cellulose crosslinking clean fracturing fluid that this test prepares for detecting embodiment 3
Performance.Test method is with reference to oil and gas industry standard SY/T5107-2005 " aqueous fracturing fluid performance evaluation way ",
Measurement equipment is RS6000 flow graph, and result sees Fig. 2.
Fig. 2 is the heatproof resistant to shearing curve of the instant modified cellulose crosslinking clean fracturing fluid 90 DEG C of embodiment 3.By Fig. 2
Shown result is it can be seen that the instant modified cellulose crosslinking clean fracturing fluid that embodiment 3 provides can be at the well of 90 DEG C
Temperature is lower to be used, at 170s-1Under the conditions of shear frozen glue viscosity after 90 minutes and be maintained at more than 50mPa s, illustrate that this instant changes
The cellulose crosslinked clean fracturing fluid of property has at 90 DEG C preferably shears heat resistance.
Test example 3
The heatproof resistant to shearing of the instant modified cellulose crosslinking clean fracturing fluid that this test prepares for detecting embodiment 5
Performance.Test method is with reference to oil and gas industry standard SY/T5107-2005 " aqueous fracturing fluid performance evaluation way ",
Measurement equipment is RS6000 flow graph, and result sees Fig. 3.
Fig. 3 is the heatproof resistant to shearing curve of the instant modified cellulose crosslinking clean fracturing fluid 120 DEG C of embodiment 5.By scheming
Result shown in 3 is it can be seen that the instant modified cellulose crosslinking clean fracturing fluid that embodiment 5 provides can be at 120 DEG C
Well temperature under use, at 170s-1Under the conditions of shear frozen glue viscosity after 90 minutes and keep more than 50mPa s, instant changing is described
The cellulose crosslinked clean fracturing fluid of property has at 120 DEG C preferably shears heat resistance.
The instant modified cellulose crosslinking clean fracturing fluid of other embodiments of the present invention identical test, test knot have been also carried out
The most similar.The heatproof resistant to shearing experimental result of the fracturing fluid of other cellulose concentration configuration is shown in Table 3.
The experiment final viscosity of the fracturing fluid of table 3 different cellulose concentration preparation
| Cellulose consumption, weight portion | 0.2 | 0.25 | 0.3 | 0.4 | 0.4 | 0.6 | 0.6 |
| Experimental temperature, DEG C | 70 | 80 | 90 | 100 | 110 | 120 | 130 |
| Final viscosity, mPa s | 105.3 | 112.9 | 95.5 | 136.7 | 78.3 | 92.3 | 57.6 |
Cellulose consumption in table 3 refers to the consumption of water in fracturing fluid relative to 100 weight portions.
Test example 4
The broken colloidality energy of the instant modified cellulose crosslinking clean fracturing fluid that this test prepares for detecting embodiment 3,
Gel breaker is Ammonium persulfate., and consumption is 0.05%；Experimental temperature is 90 DEG C.Specific experiment method is: to embodiment 3
Instant modified cellulose crosslinking clean fracturing fluid base fluid adds gel breaker and FAC-201 type polarity chelating class organic zirconium is handed over
Connection agent, then fracturing fluid gel is put in the water-bath of experimental temperature, after placing 4h, measure the apparent viscosity of breaking glue solution.
The equipment that measurement apparent viscosity is used is capillary viscosimeter, and the apparent viscosity of result of the test is 1.16mPa s, explanation
This fracturing liquid rubber-breaking is fast, and broken glue is thorough.
Other embodiments of the present invention has been also carried out identical test, and result of the test is similar.
Test example 5
The residue content of the instant modified cellulose crosslinking clean fracturing fluid that this test prepares for detecting embodiment 3.
Test method is with reference to oil and gas industry standard SY/T5107-2005 " aqueous fracturing fluid method of evaluating performance "；Measure
Equipment is centrifuge, water-bath, electronic balance etc..Experiment shows the residual of this instant modified cellulose crosslinking clean fracturing fluid
Slag content is 0mg/L, and the residue content of the guar gum fracturing fluid of comparable sodium is generally 200-300mg/L, the highest.
Other embodiments of the present invention has been also carried out identical test, and result of the test is similar.
Fracturing fluid residue is the main cause causing formation damage, by above-mentioned result of the test it can be seen that embodiment 1-5 carries
The instant modified cellulose crosslinking clean fracturing fluid of confession has without residue, the characteristic of Low Damage, and this can be substantially reduced reservoir
Injury, beneficially flow conductivity and the lifting of oil and gas production.For being prone to the hypotonic compact reservoir of injury, changing without residue
Property cellulose crosslinked clean fracturing fluid than tradition guar gum fracturing fluid with the obvious advantage.
Claims (4)
1. instant modified cellulose crosslinking a clean fracturing fluid, this instant modified cellulose crosslinking clean fracturing fluid by with
Lower one-tenth is grouped into:
FAG-500 type modified cellulose 0.2-0.6 weight portion, FAZ-1 type thickening initiator 0.1-0.5 weight portion, DL-16
Type cleanup additive 0.3-0.7 weight portion, FAJ-305 type cross-linking regulator 0.5-1.2 weight portion, FAC-201 type polarity chelate
Class organic zirconium crosslinker 0.2-0.7 weight portion, NBA-102 type capsule breaker 0.002-0.07 weight portion, water 100 weight
Amount part；
Described FAG-500 type modified cellulose is that anionic is grafted chemically-modified cellulose, and its viscosity-average molecular weight is
600000-700000；
Described DL-16 type cleanup additive be mainly composed of polyoxyethylated alkyl phenol sulphate anion surface active agent and
The mixture of polyoxyethylated alkyl phenol nonionic surfactant, wherein, by weight percentage, polyxyethylated
The percentage composition of phenolic ether sulphate anion surfactant is 15%-50%, and polyoxyethylated alkyl phenol non-ionic surface is lived
The percentage composition of property agent is 45%-10%, and remaining is water；
The main component of described FAJ-305 type cross-linking regulator is the mixture of acetic acid and formic acid, wherein, with weight percent
Than meter, the percentage composition of formic acid is 25%-50%, and the percentage composition of acetic acid is 45%-20%, and remaining is water；
Described FAC-201 type polarity chelating class organic zirconium crosslinker is for passing through C2-C7The synthesis of pluripolarity long short chain chelating agen
Organic zirconium crosslinker.
Instant modified cellulose the most according to claim 1 crosslinking clean fracturing fluid, wherein, described DL-16 type
In cleanup additive, polyoxyethylated alkyl phenol sulphate anion surface active agent and polyoxyethylated alkyl phenol non-ionic surface
The mass ratio of activating agent is 3:2.
Instant modified cellulose the most according to claim 1 crosslinking clean fracturing fluid, wherein, described FAJ-305
In type cross-linking regulator, the mass ratio of formic acid and acetic acid is 1:1.
4. the preparation method of the instant modified cellulose crosslinking clean fracturing fluid described in any one of claim 1-3, its bag
Include following steps:
Step one: under agitation, be sequentially added in water FAG-500 type modified cellulose, FAZ-1 type thickening draw
Send out agent, then stir 3min, obtain the cellulose aqueous solution of thickening；
Step 2: under agitation, is sequentially added into DL-16 type cleanup additive, FAJ-305 in described cellulose aqueous solution
Type cross-linking regulator, is uniformly mixed formation instant modified cellulose crosslinking clean fracturing fluid base fluid；
Step 3: during fracturing work, under agitation, to described instant modified cellulose crosslinking cleaning pressure
Split and liquid-based liquid be sequentially added into NBA-102 type capsule breaker, FAC-201 type polarity chelating class organic zirconium crosslinker,
Obtain the instant modified cellulose crosslinking clean fracturing fluid of frozen glue shape.
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