CN101831284A - Clean polymer-free carrier fluid - Google Patents
Clean polymer-free carrier fluid Download PDFInfo
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Abstract
The invention provides clean polymer-free carrier fluid, which is characterized by mainly comprising the following components in percentage by weight: 0.5 to 15 percent of surfactant, 0.2 to 2 percent of cross-linking aid, 0.2 to 5 percent of stabilizing agent and the balance of solvent, wherein the surfactant is long-chain betaine surfactant, the cross-linking aid is organic acid salt, the stabilizing agent is long-chain alcohol, and the solvent is small molecular alcohol solution. The clean polymer-free carrier fluid effectively overcomes the defects of low effective content of primary agents and difficult liquid preparation, solves the problem of non-uniform dispersion of a propping agent, and has the characteristics of strong viscous elasticity, high suspension property, multiple functions, expanding prevention and difficult deterioration.
Description
Technical field
The present invention relates to the operation of a kind of oil production underground fracture and go into the influent stream body, especially a kind of cleaning does not have the polymkeric substance sand-carrying agent.
Background technology
Along with Oilfield developing and the people enhancing to environmental consciousness, conventional acidizing treatment damages by people the stratum to be realized, and sand control treatment is just more and more come into one's own.In the sand-preventing process, squeeze packing and fracturing sand control are because sand controlling result is good, validity period is long, becomes the main technique in existing sand control field.The used sand-carrying agent of sand control is with pressure the stratum to be pressed off, form the crack and it is supported with propping agent, owing in the oil reservoir supported like this crack has been arranged, thereby improved near the liquid flow path of the oil reservoir of pit shaft, increased the current drainage area, reduced liquid flowing resistance, made oil well obtain the effect of volume increase.The subject matter of sand-carrying agent existence at present:
1, sand-carrying agent enter the water blocking damage that causes behind the stratum, with local water compatibleness and broken glue after the permeability injury problem that causes of residue;
2, sand-carrying agent self since easy corrupt problem need add a large amount of formaldehyde and carry out the anticorrosion environmental problem that causes;
3, sand-carrying agent heat and salinity tolerance performance is to the influence of construction effect.
Along with Oilfield developing and the people enhancing to environmental consciousness, conventional acidizing treatment damages by people the stratum to be realized, and sand control treatment is just more and more come into one's own.In the sand-preventing process, squeeze packing and fracturing sand control are because sand controlling result is good, validity period is long, becomes the main technique in existing sand control field.The used sand-carrying agent of sand control is with pressure the stratum to be pressed off, form the crack and it is supported with propping agent, owing in the oil reservoir supported like this crack has been arranged, thereby improved near the liquid flow path of the oil reservoir of pit shaft, increased the current drainage area, reduced liquid flowing resistance, made oil well obtain the effect of volume increase.The subject matter of sand-carrying agent existence at present:
1, sand-carrying agent enter the water blocking damage that causes behind the stratum, with local water compatibleness and broken glue after the permeability injury problem that causes of residue;
2, sand-carrying agent self since easy corrupt problem need add a large amount of formaldehyde and carry out the anticorrosion environmental problem that causes;
3, sand-carrying agent heat and salinity tolerance performance is to the influence of construction effect.Breakthrough as traditional polymer/gel breaking method, 1997, the expert of Ani-Agip and Schlumberger company has developed jointly out the sand-carrying agent (Viscoelastic surfactant frcturefluid) that tensio-active agent is formed, and is called for short the no polymkeric substance sand-carrying agent of cleaning.
Clean not pbz polymer polymkeric substance of no polymkeric substance sand-carrying agent, its thickening properties is to be realized by special surfactant molecule and auxiliary agent, and surfactant molecule has certain being inclined to from dimerization, as far as possible its nonpolar part is kept apart with water.This micellar structure that forms is generally coccoid or is long bar-shaped.Yet in the time of in being dissolved in salt solution, the quaternary ammonium salt cationic type of long chain hydrocarbon groups structure (as contain) surfactant molecule of some ad hoc structures can form a kind of micella that is similar to polymer ball of string structure, is different from conventional spherical or club shaped structure fully.This micellar network structure has certain anti-twist ability, presents the frozen glue shape in appearance, has stronger prop-carrying capacity, can be used as sand-carrying agent and uses.The type that cleans no polymkeric substance sand-carrying agent mainly contains the combined of cation form formulation alive, both sexes table formulation, non-ionic type and several promoting agents alive.With the rising of temperature, the surfactant system viscosity of quaternary ammonium salt, trimethyl-glycine and aliphatic tertiary amine oxide type is all on a declining curve.Even host is with big concentration (5%), under the suitable auxiliary agent type and the condition of ratio, the viscosity number under its high temperature is also lower, is difficult to satisfy high temperature and takes the sand performance demands.Particularly the solution of two types of quaternary ammonium salt and trimethyl-glycines is warmed up to 70 ℃, and viscosity number is 100mPa.s only.Continue elevated temperature, the viscosity number of aliphatic tertiary amine oxide compound also descends fast.Therefore, cleaning that must synthesizing new does not have polymeric surfactant.
Summary of the invention
The purpose of this invention is to provide a kind of novel cleaning and do not have the polymkeric substance sand-carrying agent.
The technical solution adopted in the present invention is:
A kind of clean polymer-free carrier fluid, mainly by tensio-active agent, crosslinking coagent, stablizer and solvent composition, it is characterized in that the proportioning of described weight percent is: tensio-active agent is 0.5-15%, and crosslinking coagent is 0.2-2%, stablizer is 0.2-5%, and all the other are solvent; Wherein, tensio-active agent is the long chain type betaine type amphoteric surfactant, and crosslinking coagent is an organic acid salt, and stablizer is a long-chain alcohol, and solvent is a small molecular alcohol solution.
Wherein optimum weight per-cent proportioning is: tensio-active agent is 2-8%, and crosslinking coagent is 0.5-1%, and stablizer is 1-2%, and all the other are solvent.
Tensio-active agent belongs to the long chain type betaine type amphoteric surfactant, and its chemical formula is:
Wherein, R
1Be C
16-C
22Alkyl can be straight or branched, there is alkyl in stable or instability; R
2And R
3Be C
1-C
4Alkyl also is other groups, as-OH.Can be hexadecyldimethyl benzyl ammonium trimethyl-glycine, octadecyl dimethyl betaine, eicosyl dimethyl betaine, tallow diethyl betaines.
Crosslinking coagent has: sodium salicylate, 3-hydroxyl-2-naphthalene acid sodium, sodium xylene sulfonate, hexadecyl benzene sulfonic acid sodium salt, benzenephosphonic acid sodium and other benzene sulfonic acid sodium salt derivatives.
Stablizer has lauryl alcohol, tetradecyl alcohol, hexadecanol, phenylcarbinol, nonylcarbinol.
Solvent is methyl alcohol, ethanol, Virahol, is mixed with the alcoholic solution of 20.0%-50%; Be preferably the alcoholic solution of 30.0%-40.0%.
A kind of preparation steps that cleans no polymkeric substance sand-carrying agent is:
1) beet alkali surface activator with long chain type is dissolved in the solvent, forms the alcoholic solution of 30.0%-40.0%, guarantees that tensio-active agent dissolves fully, is uniformly dispersed, as the thickening surfactant soln;
2) during dosing, the dosing pond need possess strong mixer or circulation device.Under stirring, round-robin condition,, and make it to form uniform and stable dose solution in the ratio adding thickening surfactant soln of 2.0%-8%;
3) ratio of 1.0%-2.0% adds stablizer.Continuously stirring, more than the circulation 30min;
4) stirring, under the round-robin condition,, continuously stirring, more than the circulation 30min, forming uniform and stable sand-carrying agent by the ratio adding crosslinking coagent of 0.5%-1.0%.
Compared with prior art, the present invention has following advantage:
1, can form good viscoelastic systems after crosslinked, the apparent viscosity under the normal temperature (25 ℃) is more than 300mPa.s.Have good prop-carrying capacity, and frictional resistance is a little less than the HPG sand-carrying agent;
2, effectively overcome the former dose of present situation that effective content is low, dosing is difficult, effective content 40-70%, liquid state, dosing is convenient, can finish the scene preparation of sand-carrying agent smoothly;
3, solved propping agent and disperseed inhomogenous problem, effectively delay cross linking 30-90s helps the homodisperse of propping agent and reduces frictional resistance;
4, visco-elasticity is strong, suspension good, also is difficult for during high sand ratio (50-70%) building up sand setting, helps improving sanding concentration;
5, potion multipotency has anti-swollen, not perishable characteristics; The synthesis material source is wide, conveniently synthetic and preparation is simple, need not increase specific installation.
Embodiment
Disclose novel thickening tensio-active agent among the present invention, belonged to the long chain type betaine type amphoteric surfactant,
It is a kind of common amphoterics, and its chemical formula is:
Wherein, R
1Be C
16-C
22Alkyl can be straight or branched, there is alkyl in stable or instability; R
2And R
3Be C
1-C
4Alkyl also can be replaced by other groups, as-OH.Can adopt the betaine type amphoteric surfactant of following type: hexadecyldimethyl benzyl ammonium trimethyl-glycine, octadecyl dimethyl betaine, eicosyl dimethyl betaine, tallow diethyl betaines etc.The base dosage is 0.5%-15%, and the concrete consumption during on-the-spot the use is decided according to the performance requriements of sand-carrying agent, and the dosage of optimization is generally 2.0%-8%.
The introducing of trimethyl-glycine group is strengthened the tensio-active agent biodegradability, and environment is not had toxic side effect, and the minimizing of stratum adsorptive capacity, and is lower than quaternary ammonium salt surface active agent to the absorption injury of petroleum reservoir.
Reaction principle: utilize the reaction of fat tertiary amine and halo acid esters, as follows:
The reaction example:
Octadecyl dimethyl tertiary amine and sodium chloroacetate are added there-necked flask, put into some water earlier, reaction beginning back viscosity can slowly become greatly, adds water then, and about 60 ℃ of reaction process temperature controls, promptly get alkali solution of beet at 8 hours time.
Improvement to reaction process:
As it is excessive to react tertiary amine, then can cause unhindered amina content to increase, and can increase the pungency of product; As increasing the amount of sodium chloroacetate, its corrodibility can make product be unfavorable for using, even excessive response can be incomplete yet, takes all factors into consideration reaction than being mol ratio 1: 1.Can do following improvement to this reaction process:
1. substitute NaOH with soda ash and make sodium chloroacetate,, generate oxyacetate, thereby influence the yield of trimethyl-glycine because sodium chloroacetate under the effect of NaOH, hydrolysis reaction takes place.
2. add product in advance, before reaction, can add a small amount of finished product in advance.Can play dissemination in when beginning reaction, tertiary amine solubleness is increased, can better be distributed in the solvent, increase it with sodium chloroacetate contact fast reaction speed, raising trimethyl-glycine yield.
Disclosed crosslinking coagent is an organic acid salt among the present invention.Betaine type amphoteric surfactant solution forms globular micelle at first, when its concentration after threshold value, under the effect of special organic acid salt, spherical micelle transforms to rod-shaped micelle, this micellar network structure has certain anti-twist ability, presents the frozen glue shape in appearance.Can mainly contain as the organic acid salt of crosslinking coagent: sodium salicylate, 3-hydroxyl-2-naphthalene acid sodium, sodium xylene sulfonate, hexadecyl benzene sulfonic acid sodium salt, benzenephosphonic acid sodium and other benzene sulfonic acid sodium salt derivatives.Dosage is generally 0.2%-2%, and the concrete consumption during on-the-spot the use is decided according to the consumption of betaine type amphoteric surfactant, and the dosage of optimization is generally 0.5%-1.0%.
Stablizer disclosed by the invention is the alcohols of long-chain.Utilize the cleaning sand-carrying agent of above component preparation to have good rheological and prop-carrying capacity at normal temperatures, but under high temperature or intensive shearing action, present the phenomenon that viscosity reduces, influenced prop-carrying capacity.The alcohols of long-chain is an effective stabilizer, and it can adsorb the surface of ground rod-shaped micelle, has replenished the gap between the beet alkali surface activator, and has strengthened its lipophilicity, thereby improved the temperature resistance anti-shear ability significantly.What can be used as stablizer mainly contains lauryl alcohol, tetradecyl alcohol, hexadecanol etc., and phenylcarbinol, nonylcarbinol etc. also can be used as stablizer and use in addition.The dosage of stablizer is generally 0.2%-5.0%, should get full-page proof before on-the-spot the use and test to determine optimum amount, and the dosage of optimization is generally 1.0%-2.0%.
Solvent disclosed by the invention is various small molecule alcohols, as methyl alcohol, ethanol, Virahol etc.Because the solvability of the beet alkali surface activator of long chain type is not high, when prepare at the scene in (winter) particularly at low temperatures, easily form throw out or throw out, influence the performance of sand-carrying agent.Therefore need to use solvent earlier it to be mixed with certain density solution, its concrete dosage gets final product so that beet alkali surface activator is dissolved fully, usually it can be mixed with the alcoholic solution of 20.0%-50%, more the consumption of You Huaing is generally the alcoholic solution of 30.0%-40.0%.
The sand-carrying agent preparation steps:
First-selected beet alkali surface activator with long chain type is dissolved in the solvent (small molecule alcohol), forms the alcoholic solution of 30.0%-40.0%, guarantees that tensio-active agent dissolves fully, is uniformly dispersed, as the thickening surfactant soln.
During on-the-spot dosing, the dosing pond need possess strong mixer or circulation device.Under stirring, round-robin condition,, and make it to form uniform and stable dose solution in the ratio adding thickening surfactant soln of 2.0%-8%.
Ratio in 1.0%-2.0% adds stablizer again.Continuously stirring, more than the circulation 30min.
Stirring, under the round-robin condition,, continuously stirring, more than the circulation 30min, forming uniform and stable sand-carrying agent at last by the ratio adding crosslinking coagent of 0.5%-1.0%.
Crosslinking coagent can add in the dosing process, is transported to the well site after the formation sand-carrying agent and uses.Also can in construction process, together join in the sand-carrying agent, need accurately regulate the adding discharge capacity of crosslinking coagent, in order to avoid influence the performance of sand-carrying agent with propping agent.
Comprehensive crosslinking method is: because the cleaning sand-carrying agent is crosslinked than higher, generally be controlled between 2%～10%.And current construction equipment mainly matches with conventional water-base carrier fluid system, and crosslinked ratio is between 0.2%～0.4%.The control of general crosslinked condition is difficult to meet the demands, and exists liquid discharge capacity on the linking agent, demarcation metering to have defective.Therefore adopt impeller pump and truck-mounted blender to inject linking agent, and proofread and correct the relation of rotating speed and discharge capacity before use, realize the accurate demarcation metering of linking agent, satisfy the requirement of construction with the method that applicator roller is used.
Crosslinking method is behind the pump: because the cleaning sand-carrying agent is crosslinked very fast, effective delay cross linking is if employing crosslinked meeting in the mulling bucket causes liquid and sand thorough mixing, particularly high sand ratio stage to cause sand plug probably.Thereby improve crosslinked program at the scene, and crosslinked behind the employing pump, make the crosslinked low-pressure manifold that occurs in, and install thief hatch additional.After the repacking, both realized that mulling was even, reduced the sand-carrying agent frictional resistance again.
Clean no polymkeric substance sand-carrying agent and mainly contact the back and realize broken glue, but in the site operation of the low oil well of gas well, well and oil saturation, expose the problem of the broken glue difficulty of sand-carrying agent with underground crude oil, local water.Displacing liquid return arranged after, the sand-carrying agent in high sand ratio stage is not owing to contact with underground crude oil, thereby is difficult to brokenly glue, it is higher to return discharge opeing viscosity, small portion returns discharge opeing and contains sand.Adopt three kinds of modes to guarantee the thoroughly broken gel water of sand-carrying agent.
(1) the broken glue of hydro carbons
With broken glue after the contact action of stratum kerosene hydro carbons such as (diesel oil), indoor test shows that broken glue effect is obvious, breaking glue solution viscosity below 5mPa.s, the requirement of the 10mPa.s of industry standard regulation fully;
(2) local water dilution
Broken glue viscosity reduction under the local water diluting effect, the construction back is under the diluting effect of local water, and sand-carrying agent viscosity reduces gradually.This sand-carrying agent can break gel water voluntarily under the effect of the local water of high salinity, viscosity drop is low to moderate in the 5mPa.s behind the 8h.
| Formation water salinity ppm | The ratio of local water and sand-carrying agent | Broken glue temperature ℃ | Broken glue time h | Breaking glue solution viscosity mPa.s |
| ??30000 | ??1∶1 | ??80 | ??8 | ??4.2 |
| ??30000 | ??2∶1 | ??80 | ??8 | ??3.6 |
| ??40000 | ??1∶1 | ??80 | ??8 | ??3.8 |
| ??40000 | ??2∶1 | ??80 | ??8 | ??2.8 |
| ??50000 | ??1∶1 | ??80 | ??8 | ??3.9 |
| ??50000 | ??2∶1 | ??80 | ??8 | ??2.5 |
(3) adding delays gel breaker
Having developed a kind of novel cleaning does not have the special-purpose gel breaker of polymkeric substance sand-carrying agent, gel breaker adopt can be under formation condition slowly hydrolysis and emit the material of acid, as three oxygen methylbenzene, benzyl chloride etc.,, obtain delaying gel breaker with the oil-soluble material coating.Do not bring into play brokenly the glue effect during construction; After construction finishes, under the effect of oil gas dissolving, closure stress extruding, progressively discharge, realize broken gel water.The dosage of optimizing the back gel breaker is 0.03%-0.05%.Shop experiment shows, dosage is 0.05% when above, breaking glue solution viscosity number＜5mPa.s in the 8h.
| Gel breaker dosage % | Broken glue temperature ℃ | Broken glue time h | Breaking glue solution viscosity mPa.s |
| ??0.03 | ??80 | ??8 | ??4.6 |
| ??0.035 | ??80 | ??8 | ??4.1 |
| ??0.04 | ??80 | ??8 | ??3.8 |
| Gel breaker dosage % | Broken glue temperature ℃ | Broken glue time h | Breaking glue solution viscosity mPa.s |
| ??0.045 | ??80 | ??8 | ??3.2 |
| ??0.05 | ??80 | ??8 | ??3.4 |
| ??0.055 | ??80 | ??8 | ??2.9 |
Use technology disclosed by the invention to carry out the laboratory experiment test:
1, rheological
(1) shear at high temperature stability:
Under 100 ℃ of conditions of steady temperature, system viscosity about 45mPas, and during test is carried out 2 hours kept stable.The explanation system has very high shear stability and thermostability.Clean no polymkeric substance sand-carrying agent and have good shear stability, the variation of its viscosity number is insensitive to shearing, viscosity recovery is better, and this has effectively overcome the HPG sand-carrying agent in construction process, because the phenomenon that the prop-carrying capacity that irreversible shear degradation causes descends.
(2) rheological analysis
When 100 ℃ of temperature, with 170s
-1Shearing rate, shear viscosity＞130mPa.s after 2 hours; Temperature is the important factor that influences apparent viscosity, and variation of temperature directly determines micellar form, length etc. particularly, and the viscosity number difference is very big; The rheological of this sand-carrying agent is not in full conformity with the power law rheological equation, but if fixing a certain temperature is investigated the variation of its viscosity number with shear time, then meets exponential flow substantially and become equation; This sand-carrying agent does not exist and shear the chain rupture phenomenon, so anti-shear performance is stronger owing to there is not high molecular polymer, and viscosity recovery is good.
2, broken colloidality energy
(1) the broken glue of hydro carbons
With broken glue after the contact action of stratum kerosene hydro carbons such as (diesel oil), indoor test shows that broken glue effect is obvious, breaking glue solution viscosity below 5mPa.s, the requirement of the 10mPa.s of industry standard regulation fully;
(2) local water dilution
Broken glue viscosity reduction under the local water diluting effect, the construction back is under the diluting effect of local water, and sand-carrying agent viscosity reduces gradually.Shop experiment sees the following form:
As seen from the above table, clean no polymkeric substance sand-carrying agent under the effect of the local water of high salinity, can break gel water voluntarily, viscosity drop is low to moderate in the 5mPa.s behind the 8h.
(3) adding delays gel breaker
With the oil-soluble material coating, do not bring into play brokenly the glue effect during construction; After construction finishes, under the effect of oil gas dissolving, closure stress extruding, progressively discharge, realize broken gel water.Shop experiment shows, dosage is 0.05% when above, breaking glue solution viscosity number＜5mPa.s in the 8h.
After broken glue mode was improved, basic do not have appearance again to break the halfway phenomenon of glue.Gas well sand-carrying agent after this returns in row's process, and the breaking glue solution viscosity of monitoring is all less than 5mPa.s, and does not have residue substantially, has realized broken completely gel water, and the row of returning leads has also improved 10～15% on original basis.
3, breaking glue solution leak-off
Table 3-2 leak-off property testing result
Under 100 ℃ condition, it is 8.11 * 10 that 5% cleaning does not have polymkeric substance sand-carrying agent frozen glue leakoff coefficent
-4M/min
0.5, the filtration rate of leak-off property testing time 30min is 1.00 * 10
-4M/min.Leak-off slightly is better than melon matrix sand-carrying agent.Although wall place in crack shears serious, but transform mutually between the tensio-active agent of cleaning sand-carrying agent and the micella, it is the running balance system, there is stronger reactive force between the micella, be the 3 D stereo network structure, though do not generate filter cake, can be because of the broken fully gel water of shearing, so sand-carrying agent helps reducing leak-off.This point can be come from site operation as can be seen, on strong leak-off stratum, in the sand control process as wells such as car 274-5, big northern 12-7, does not see that significantly because of the leak-off sand fallout shows, construction back pressure drop is slower.
4, nocuity
(1) shop experiment
Finished the injury research to core permeability, this sand-carrying agent breaking glue solution is to the injury rate average 13.7% of rock core.
Test quartz sand particle size: 0.45mm-0.9mm, sanding concentration: 5.0kg/m
2, locking pressure: 40Mpa, temperature: 100 ℃
As propping agent, the initial flow conductivity in crack is 28.58 μ m with quartz sand
2* cm, by the 300ml sand-carrying agent, fissured flow conductivity drops to 26.45 μ m behind the 140h
2* cm, the retention rate of flow conductivity are 94.6%.Test shows: the existence of melon matrix sand-carrying agent filter cake makes polymer concentration compare with stoste to have improved 15 times, to stratum permeability injury rate about 50%; Viscous liquid (broken glue is not thorough) produces in flow process than the high current dynamic resistance, and the existence of residue makes flow conductivity decline about 30% (400mg/l) of supporting crack.
(2) nocuity analysis
By test, the nocuity of cleaning sand-carrying agent is analyzed: no filter cake generates, and has kept the primary permeability of crack wall to greatest extent; No residue forms, and has kept the flow conductivity of supporting crack preferably; Sand-carrying agent pH value remains on neutrality, has avoided Ca
2+, Mg
2+Plasma generates precipitation under alkaline condition; Under the conventional gas and oil condition, broken glue helps the row of returning fast thoroughly, rapidly.
By parameter testings such as surface and interface tension force, residue content, flowback effects, broken glue effect is carried out comprehensive evaluation, utilize the test of thing mould to finish the row's of the returning rule research under the reservoir condition.The surface tension 25mN/m of this sand-carrying agent breaking glue solution, interfacial tension 0.36mN/m does not have residue substantially.
Broken glue mode the halfway phenomenon of glue can not occur brokenly after improving substantially.Return in row's process at the gas well sand-carrying agent, the breaking glue solution viscosity of monitoring is all less than 5mPa.s, and do not have residue substantially, realized broken completely gel water, and the row of returning leads also can improve 20～30% on original basis.
Claims (10)
1. clean polymer-free carrier fluid mainly by tensio-active agent, crosslinking coagent, stablizer and solvent composition, is characterized in that the proportioning of described weight percent is:
Tensio-active agent is 0.5-15%, and crosslinking coagent is 0.2-2%, and stablizer is 0.2-5%, and all the other are solvent; Wherein, tensio-active agent is the long chain type betaine type amphoteric surfactant, and crosslinking coagent is an organic acid salt, and stablizer is a long-chain alcohol, and solvent is a small molecular alcohol solution.
2. clean polymer-free carrier fluid according to claim 1, it is characterized in that described optimum weight per-cent proportioning is: tensio-active agent is 2-8%, and crosslinking coagent is 0.5-1%, and stablizer is 1-2%, and all the other are solvent.
3. clean polymer-free carrier fluid according to claim 1 is characterized in that described tensio-active agent belongs to the long chain type betaine type amphoteric surfactant, and its chemical formula is:
Wherein, R
1Be C
16-C
22Alkyl can be straight or branched, there is alkyl in stable or instability; R
2And R
3Be C
1-C
4Alkyl also is other groups, as-OH.
4. clean polymer-free carrier fluid according to claim 1 is characterized in that described tensio-active agent can be hexadecyldimethyl benzyl ammonium trimethyl-glycine, octadecyl dimethyl betaine, eicosyl dimethyl betaine, tallow diethyl betaines.
5. clean polymer-free carrier fluid according to claim 1 is characterized in that described crosslinking coagent has: sodium salicylate, 3-hydroxyl-2-naphthalene acid sodium, sodium xylene sulfonate, hexadecyl benzene sulfonic acid sodium salt, benzenephosphonic acid sodium and other benzene sulfonic acid sodium salt derivatives.
6. clean polymer-free carrier fluid according to claim 1 is characterized in that described stablizer has lauryl alcohol, tetradecyl alcohol, hexadecanol, phenylcarbinol, nonylcarbinol.
7. clean polymer-free carrier fluid according to claim 1 is characterized in that described solvent is methyl alcohol, ethanol, Virahol.
8. according to claim 1 or 7 described clean polymer-free carrier fluids, it is characterized in that described solvent is the alcoholic solution that is mixed with 20.0%-50%.
9. according to claim 1 or 7 described clean polymer-free carrier fluids, it is characterized in that the consumption of described solvent optimization is generally the alcoholic solution of 30.0%-40.0%.
10. clean polymer-free carrier fluid according to claim 1 is characterized in that its preparation steps is:
1) beet alkali surface activator with long chain type is dissolved in the solvent, forms the alcoholic solution of 30.0%-40.0%, guarantees that tensio-active agent dissolves fully, is uniformly dispersed, as the thickening surfactant soln;
2) during dosing, the dosing pond need possess strong mixer or circulation device, is stirring, under the round-robin condition, by the ratio adding thickening surfactant soln of 2.0%-8%, and is making it to form uniform and stable dose solution;
3) ratio of 1.0%-2.0% adds stablizer, continuously stirring, more than the circulation 30min;
4) stirring, under the round-robin condition,, continuously stirring, more than the circulation 30min, forming uniform and stable sand-carrying agent by the ratio adding crosslinking coagent of 0.5%-1.0%.
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| CN104371700A (en) * | 2014-11-06 | 2015-02-25 | 中国石油天然气集团公司 | Clean fracturing fluid |
| CN107513382A (en) * | 2016-06-17 | 2017-12-26 | 中国石油化工股份有限公司 | A kind of clean sand carrier and preparation method thereof |
| CN108251094A (en) * | 2016-12-28 | 2018-07-06 | 中国石油天然气股份有限公司 | A kind of load fluid and its preparation method and application |
| CN108441204A (en) * | 2018-04-17 | 2018-08-24 | 四川申和新材料科技有限公司 | A kind of betaines high-temperature cross-linking agent and preparation method thereof |
| CN109825273A (en) * | 2019-04-08 | 2019-05-31 | 东营利丰化工新材料有限公司 | A kind of efficient polymer-free carrier sand liquid resistant to high temperature |
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| CN102002354A (en) * | 2010-11-02 | 2011-04-06 | 上海大学 | Oil displacement agent with ultra-low oil-water interfacial tension and application thereof |
| CN102226080A (en) * | 2011-04-26 | 2011-10-26 | 中国海洋石油总公司 | Breakdown fluid and preparation method thereof |
| CN102226080B (en) * | 2011-04-26 | 2013-06-19 | 中国海洋石油总公司 | Breakdown fluid and preparation method thereof |
| CN104371700A (en) * | 2014-11-06 | 2015-02-25 | 中国石油天然气集团公司 | Clean fracturing fluid |
| CN107513382A (en) * | 2016-06-17 | 2017-12-26 | 中国石油化工股份有限公司 | A kind of clean sand carrier and preparation method thereof |
| CN108251094A (en) * | 2016-12-28 | 2018-07-06 | 中国石油天然气股份有限公司 | A kind of load fluid and its preparation method and application |
| CN108251094B (en) * | 2016-12-28 | 2020-09-04 | 中国石油天然气股份有限公司 | Sand carrying liquid and preparation method and application thereof |
| CN108441204A (en) * | 2018-04-17 | 2018-08-24 | 四川申和新材料科技有限公司 | A kind of betaines high-temperature cross-linking agent and preparation method thereof |
| CN109825273A (en) * | 2019-04-08 | 2019-05-31 | 东营利丰化工新材料有限公司 | A kind of efficient polymer-free carrier sand liquid resistant to high temperature |
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