CN105001373A - Seawater base quick-dissolving type temperature-resistance fracturing fluid system - Google Patents
Seawater base quick-dissolving type temperature-resistance fracturing fluid system Download PDFInfo
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Abstract
The invention discloses a thickening agent. The main structure is compounded polymer with sulfonate as the main structure and vinyl pyrrolidone, acrylonitrile and cationic monomer as the subprimary monomer. The weight ratio of the sulfonate, the vinyl pyrrolidone, the acrylonitrile and the cationic monomer is 9:2:4:1. The invention further discloses a seawater base quick-dissolving type temperature-resistance fracturing fluid system prepared by the thickening agent. The prepared fracturing fluid can use the seawater directly for liquid match and can instantly dissolve within 5 min, the residue content is smaller than 100 mg/L which is much lower than a industrial standard of being no greater than 600mg/L, and the damage to the bottom layer is reduced greatly.
Description
Technical field
The present invention relates to a kind of seawater base Instant fracturing fluid system, especially a kind of seawater base Instant being applicable to higher seawater temperature presses resistance to anneal crack liquid system.
Background technology
For Low permeable oil and gas reservoirs, fracturing technique is main well stimulation.The seepage state of hydrocarbon zone can be improved by fracturing operation, play the effect of increasing yield and injection.At present, applying fracturing technique is improve the most effectual way of low permeability reservoir per-well production.
At present, China's offshore oil and gas rich reserves; But hypotonic reserves oil gas development degree is lower.Along with the exploitation of offshore oil and gas field, the Main way that exploitation deep-sea and low-permeability oilfield will be Chinese Enterprises oil field development at sea from now on.Due in prior art, fracturing liquid all adopts fresh water to prepare.And offshore operation, obtain fresh water and store the limited in one's ability of fresh water; By the impact of the factor such as water resources, place, limit the scale of offshore oilfield fracturing reform, constrain the Efficient Development of marine hypotonic oil gas.
If seawater around offshore work platform can be utilized as water source, situ configuration fracturing liquid will have great importance to the Efficient Development of offshore oilfield.Because physical environment (as tropical storm, cold wave) often can cause fresh water transport difficult; With seawater preparing fracturing fluid base fluid, avoid the dependence to fresh water; Save transport charge, storage cost, alleviate the pressure of logistics support; Seawater resources enrich, and can draw materials nearby, provide condition for marine massive hydraulic fracture; The timely enforcement of offshore oilfield Hydro Fracturing Stimulation Treatment can be ensured; The more important thing is and provide technical support to following off-lying sea Reservoir Development.
Because seawater component is complicated, make seawater be difficult to directly replace fresh water as base fluid, utilize the recipe configuration fracturing liquid of existing aqueous fracturing fluid.Seawater how is utilized to replace fresh water to be the technical problem that those skilled in the art thirst for solving as base fluid configuration fracturing liquid.
Summary of the invention
The object of this invention is to provide a kind of seawater that utilizes replaces fresh water as the fracturing liquid of base fluid; Concrete technical scheme is:
A kind of viscosifying agent take sulfonate as agent structure, is time polymkeric substance of main monomer synthesis with vinyl pyrrolidone, vinyl cyanide, cationic monomer; The weight ratio of sulfonate, vinyl pyrrolidone, vinyl cyanide, cationic monomer is: 9:2:4:1.
Further, described sulfonate is 2-acrylamide-2-methyl propane sulfonic acid salt.
Further, described cationic monomer is the one in methyl diallyl ammonium chloride, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride or acrylyl oxy-ethyl-trimethyl salmiac.
The present invention also develops the preparation method of above-mentioned viscosifying agent, comprises the following steps:
1) with the disodium salt of the EDTA of concentration 0.02 mol/L, the function monomer that viscosifying agent formula materials forms is dissolved, add catalyzer and cause;
2) by the rapid water conservancy diversion of polymer tacky solution that caused to wide 100cm, be highly in the flat board of 1cm, according to the needs of monomer polymerization ability, in flat board, supplement a part of catalyzer;
3) tabular colloid is poured into kneader and carry out tensio-active agent process grafting repolymerization;
4) particle diameter of finished product polymer billet is reduced with column mill;
5) polymer billet is dried;
6) polymer billet is pulverized, sieve with 60 mesh sieve extension sets.
Utilize above-mentioned viscosifying agent, the present invention also develops a kind of seawater base Instant heatproof fracturing fluid system, is made up of viscosifying agent, delayer, linking agent, demulsification cleanup agent, gel breaker and seawater; Described viscosifying agent is viscosifying agent as claimed in claim 1; The weight percent of viscosifying agent described in formula is 0.9% to 1%, the weight percent of described delayer is 0.1% to 0.2%, the weight percent of described linking agent is 0.7% to 0.8%, the weight percent of described demulsification cleanup agent is 0.2% to 0.3%, the weight percent 0.15% to 2% of described gel breaker, surplus is seawater.
Further, described linking agent is be the organic zirconium of Material synthesis by trolamine, citric acid and zirconium oxychloride; Zirconium oxychloride: citric acid: the mol ratio of trolamine is 2:1:7, and temperature of reaction is 80 DEG C-90 DEG C, reaction times 4-6h.
Further, described delayer is polyesteramide delayer; Made by following steps:
1) with Tetra hydro Phthalic anhydride (E) and diethanolamine (F) for raw material, obtained EF2 type monomer;
2) adding TriMethylolPropane(TMP) is core, and the weight ratio of TriMethylolPropane(TMP) and EF2 type monomer is 1:10; Adopt one-step synthesis method super-branched polyesteramide, and with stearic acid, blocking modification is carried out to resulting polymers.
Further, described gel breaker is made up of ammonium persulphate, hydrogen peroxide and peracetic acid, and mol ratio is 1:1:1.
Further, the weight percent of described viscosifying agent is 0.9%.
Further, the weight percent of described viscosifying agent is 1%.
Viscosifying agent of the present invention makes fracturing liquid that seawater can be adopted to configure.Overcome offshore oilfield due to the restriction of the scale to marine oil field fracturing reform by the impact of the factor such as water resources, place, be conducive to the Efficient Development of offshore oil and gas.The fracturing liquid configured can use the direct dosing of seawater and to reach 5min instant; Residue content < 100mg/L, well below industry standard≤600mg/L, greatly reducing the injury to bottom.
Accompanying drawing explanation
Fig. 1 is the polymer molecular structure schematic diagram of seawater base instant dissolving viscosifier;
Fig. 2 is the SEM photo on the polymer molecule surface of seawater base instant dissolving viscosifier;
Fig. 3 is the infrared spectrogram of seawater base instant dissolving viscosifier;
Fig. 4 is the molecular model schematic diagram of anti-salt multiple crosslinking agent;
Fig. 5 is the infrared spectrogram of anti-salt multiple crosslinking agent.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be described.
Seawater base Instant heatproof fracturing fluid system disclosed by the invention, is made up of viscosifying agent, delayer, linking agent, demulsification cleanup agent, gel breaker and seawater.In formula, the weight percent of viscosifying agent is 0.8% to 1%; The weight percent of delayer is 0.1% to 0.3%; The weight percent of linking agent is 0.7% to 0.8%; The weight percent of demulsification cleanup agent is 0.2% to 0.3%; The weight percent 0.15% to 2% of gel breaker; Surplus is seawater.Choose the consumption that lower limit reduces the component except seawater, can cost be saved.Be described with the 140 DEG C of seawater base Instant heatproof fracturing liquids being applicable to formation temperature less than 140 DEG C for the 95 DEG C of seawater base Instant heatproof fracturing liquids being applicable to formation temperature less than 95 DEG C below.
Embodiment 1
In the present embodiment, 95 DEG C of seawater base Instant heatproof fracturing liquid formulas are: the weight percent 0.8% of the weight percent 0.9% of seawater base instant dissolving viscosifier, the weight percent 0.1% of delayer, anti-salt multiple crosslinking agent, the weight percent 0.3% of demulsification cleanup agent, the weight percent 0.2% of gel breaker; All the other are seawater.
As shown in table 1, mineral substance in seawater, except the elements such as Na, K, Cl, B, Ca, Mg that content is more, also comprise high price, the transition-metal ions elements such as Br, I, Cr, Fe, Al, As of trace or trace, the stretching, extension of the process Middle molecule that the existence of these ion elements makes macromolecule thickener dissolve in aquation is affected, and the higher impact of calcium, magnesium ion content is larger, and curling being difficult to of viscosifying agent molecular chain trails, cause viscosifying agent to dissolve not exclusively, or even can not dissolve completely.Therefore, need to develop a kind of instant dissolving viscosifier, shorten the swelling time of viscosifying agent.
Table 1 seawater intermediate ion examining report table
Seawater sample Analysis of test results according to providing is seen, the total mineralization of seawater sample: 29000 ~ 35000mg/L, pH value between 6.0 ~ 7.0, between calcium and magnesium ion concentration 1200 ~ 1500mg/L, boric acid content 2 ~ 30mg/L.
The synthesis of general polymerization thing adopts double bond monomer to carry out copolymerization and homopolymerization, in the Molecular Structure Design of seawater-based fracturing fluid viscosifying agent, demand fulfillment viscosifying agent resistant to shearing, height take the fundamental property of sand, temperature resistance, low residue, therefore be agent structure with sulfonate on selection synthon, propylene is fine, vinyl pyrrolidone etc. be the polymkeric substance of secondary main monomer structure.What the sulfonate monomer in molecular designing solved is polymkeric substance anti-salt property in the seawater, and sulfonate monomer ratio is higher in theory, and the saline-alkaline tolerance of polymkeric substance is stronger, but molecular weight will be lower simultaneously, to such an extent as to viscosifying agent consumption can increase.Adding the warm and fine vinylpyrrolidone monomer of propylene and can solve polymkeric substance temperature resistance in the seawater and resistant to shearing performance issue in molecular designing, both content is higher, resistance to gentle resistant to shearing ability is also stronger, but unsuitable excessive, can cause after excessive molecular weight less, cause polymkeric substance indissoluble solution.So performance requriements can be taken into account in research to determine the ratio that each component is applicable to.The viscosifying agent in theory with this component polymer is a kind of molecular structure of hyperbranched degree, and have the side chain of a branch type structure in each building block, the molecular structure model that polymkeric substance has as shown in Figure 1.
Its side chain more hydrolyzables ability of polymkeric substance with higly branched chain structure is poorer, and heat-resisting property is better.In side chain, the more saline-alkaline tolerances of sulfonate functional groups are stronger.And side chain more cross-linking set position is more, linking agent and polymkeric substance have more cross-linking set and more powerful crosslinked toughness.The prop-carrying capacity of the more crosslinkeds of cross-linking set is also stronger.Crosslinked toughness stronger resistant to shearing ability is stronger.
Viscosifying agent in the present embodiment is called seawater base instant dissolving viscosifier, and this viscosifying agent is be agent structure with sulfonate, is time polymkeric substance of main monomer synthesis with vinyl pyrrolidone, vinyl cyanide, cationic monomer; The weight ratio of sulfonate, vinyl pyrrolidone, vinyl cyanide, cationic monomer is: 9:2:4:1.
Sulfonate is wherein 2-acrylamide-2-methyl propane sulfonic acid salt.During concrete enforcement,
Cationic monomer is wherein methyl diallyl ammonium chloride; Also can by the one in MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride or acrylyl oxy-ethyl-trimethyl salmiac during concrete enforcement.Or by component mixing wherein.
Seawater base instant dissolving viscosifier in vegetable jelly viscosifying agent conventional in fresh water pressure break system and the present embodiment is carried out rheometer test contrast respectively in seawater and fresh water.
Experiment condition: the different vegetable jelly under 0.5% concentration that coexists and polymkeric substance, 120 DEG C, 170s
-1the viscosity number of condition down cut 1h.Correlation data is as table 2:
The different viscosifying agent of table 2 is anti-shearing, the contrast of salt tolerant, water-insoluble index
Demonstrate according to comparing result: its water-insoluble of seawater base instant dissolving viscosifier is only 0.05%, than any one plant with all low many of the water-insoluble of composite plant glue, the injury of formation is little.And its heat-resisting property and anti-shear performance are all better than vegetable jelly and composite plant glue.
Seawater dosing requirement is met in order to make seawater base instant dissolving viscosifier; The production technique of technician to viscosifying agent is improved.Concrete steps are:
Step 1), be with water, function monomer is dissolved in technique in the past.After optimization, replace water with the disodium salt of the EDTA of concentration 0.02 mol/L, carry out the dissolving of function monomer.Its Main Function solves the impact of high salinity on viscosifying agent cross-link intensity, rate of crosslinking and crosslinked rear viscosity with this.
Step 2), will in the past in technique tank polymerization change dull and stereotyped still polymerization technique into.In the polymerization process of this individual system, can function monomer be the key of synthesis according to predetermined topology convergence.Traditional aqueous polymerization mainly relies on the selection of catalyzer, concentration, starting temperature by monomer polymerization, but in this molecular designing, the reactivity ratio of several monomer is not identical, even fall far short, more difficult is by function monomer homogeneous polymerization in edta salt solution, to be only difficult to realize by traditional Aqueous Solution method.
Step 2) in the catalyzer redox system of selecting superoxide to form together with reductive agent.Wherein superoxide can be one or more in hydrogen peroxide, benzoyl peroxide and tert-butyl peroxide; Reductive agent then can adopt in sulphite, hydrosulphite, organic amine one or more.
The consumption of catalyzer is 1% to 2.8% or 3.1% to 5% of monomer by weight percentage.
Overcome over-expense chain reactivity ratio of monomer to differ greatly and edta salt solution inhibits the problem of the radical polymerization difficulty caused, the effective concentration that improve polymerization single polymerization monomer, two consumptions that will increase redox agent.If the tank polymerization in adopting polymerization technique in the past, the difference that just still is large and still is little.We know, monomer concentration is higher, catalytic amount is more easily polymerized more greatly, but exothermic heat of reaction is also more, easily forms implode, and the direct result of implode is that molecular weight is extremely low and be easy to cause polymkeric substance not dissolve.For ensureing that molecular weight is not too low, preferably control between 300-500 ten thousand, more will ensure that the swelling time of polymkeric substance requires to control within 5min, a matter of utmost importance is withdrawn from outside reaction system by heat of polymerization in time.In view of tank polymerization heat of polymerization is difficult to withdraw from time, for this demand, we will adopt a kind of new-type polymerization technique, i.e. dull and stereotyped polymerization technique.
So-called dull and stereotyped polymerization technique be by the rapid water conservancy diversion of polymer tacky solution that caused to wide 100cm, be highly in the flat board of 1cm, according to the needs of monomer polymerization ability, in flat board, also need supplementary a part of catalyzer.This flat board is adopted to replace polymeric kettle object to be the steep temperature rise that can remove fast because monomer and catalyst concn increase and cause.This technique is utilized to ensure on the one hand to realize the function monomer polymerization that reactivity ratio is not identical the resistant to shearing of viscosifying agent, temperature resistance, anti-salt, take sand rheological property.
Step 3), after flat board polymerization terminates, increase kneader mediate postprocessing working procedures.Tabular colloid is poured into kneader and carry out tensio-active agent process grafting repolymerization, the object of process is the rear hydrophilicity increasing polymkeric substance, improves dissolution rate.
Step 4), polymkeric substance is dried.
Step 5) pulverizing process column mill replaces reducing the particle diameter of final polymer to rolling pulverizer.
Step 6) sieve with 60 mesh sieve extension sets, by polymkeric substance, by common 30-40 order, this changes 60 orders into, by the instant problem reducing polymkeric substance particle diameter physical method solution product.
Contrast experiment's data of the product guanidine glue of the seawater base instant dissolving viscosifier obtained by above-mentioned technique and existing better performances as shown in Table 3 and Table 4.
The dissolution rate of table 3 guanidine glue in different water and viscosity contrast
Dissolution rate in the different water of table 4 seawater base instant dissolving viscosifier and viscosity contrast
The infrared spectra of seawater base instant dissolving viscosifier as shown in Figure 3; By Infrared spectroscopy, can find out wherein there are 3 kinds of comonomer structures in copolymerization product simultaneously.-SO in A
3-3 vibration absorption peaks, be 1188,1115 and 1040cm respectively
-1; The corresponding 1665cm in the carbonyl stretching absorbance peak of amide group in B
-1, the corresponding 1614cm of CN key in C
-1.The ester carbonyl group characteristic peak 1720cm of D
-1, not obvious, need quantitatively to determine that it exists by ultimate analysis.
The evaluation and test of seawater base instant dissolving viscosifier is tested according to oil and gas industry standard " SY/T5107-2005 aqueous fracturing fluid method of evaluating performance ".
Hyperbranched polymer will form the gelled fracturing fluid of some strength with linking agent, and the radius of cross-linker molecules is less, and required thickener concentration is larger; Increase the radius of cross-linker molecules, just can reduce thickener concentration, also can form the frozen glue of some strength.This subject study goes out the novel crosslinker containing bull functional group, is referred to as anti-salt multiple crosslinking agent.The cross-linker molecules model of imagination is as Fig. 4.
Anti-salt multiple crosslinking agent is with zirconium oxychloride, citric acid, diethanolamine, trolamine and glycerol etc. are raw material, have studied ligand kind, ligand and zirconium oxychloride proportioning, the organic zirconium to synthesis such as temperature of reaction and reaction times is 3 at pH value, crosslinking ratio is the performance of crosslinked seawater-based fracturing fluid molecule under the condition of 100::06, find: select trolamine, citric acid and zirconium oxychloride be the organic zirconium of Material synthesis at zirconium oxychloride: citric acid: the mol ratio of trolamine is 2:1:7, temperature of reaction is 80 DEG C-90 DEG C, reaction times controls when 4-6h, synthesis organic zirconium has good cross-linking properties to viscosifying agent, the time forming frozen glue is shorter, gel state is good, temperature tolerance is better.The mechanism of organic zirconium crosslinker characterizes as shown in Figure 5.
As seen from the figure: 3353.3cm
-1the absorption peak at place may be N-H (stretching) vibration of amine, also may be the contraction vibration of-OH, 3158.4cm
-1the absorption peak at place is-OH vibration in carboxylic acid molecules, 2937.7cm
-1and 2901cm
-1the absorption peak at place is C-H (stretching) vibration of alkyl, 1631.5cm
-1the absorption peak at place is C=O (stretching) vibration, 1095.5cm
-1the absorption peak at place is C-N (stretching) vibration of amine, containing amido and hydroxyl in the organic zirconium of known synthesis.
When linking agent contacts with the viscosifying agent aqueous solution, the hydroxyl in polymer/metallic ion and viscosifying agent, amide group, amino generation are cross-linked to form bull structure.General linking agent is all be mixed with the certain density aqueous solution, and water is the diluent of polymerization amphoteric metal ion.In anti-salt multiple crosslinking agent process for preparation, replace water as the diluent of polymerization amphoteric metal ion with the low-molecular(weight)polymer aqueous solution, add appropriate organic acid as ion protective material and inhibitor simultaneously.
Low-molecular(weight)polymer diluent is made up of the sodium polyacrylate of 3000 ~ 5000 molecular weight and the polyacrylic acid of 3000 ~ 5000 molecular weight, the two is mixed with the diluent of a buffered soln as linking agent, its main purpose be improve linking agent salt tolerance and improve the compatibleness of linking agent and seawater base instant dissolving viscosifier.
The evaluation and test of antagonism salt multiple crosslinking agent is tested according to oil and gas industry standard " SY/T 6216-1996 pressure break linking agent method for testing performance ".
Table 5 different linking agent performance comparison table
Can consider a series products with chelating ability during usual selection delayer, the delayed cross-linking time can be reached by two approach, and one is the duration of contact controlling ion in anti-salt multiple crosslinking agent and seawater base instant dissolving viscosifier; Two is the release rate of cross-linking ion in Delay Action Crosslinker.Crosslinking time can be made to be controlled effectively by these two aspects.According to Different Strata temperature, select the crosslinking time be applicable to.
Polyesteramide delayer is adopted in the present embodiment, with Tetra hydro Phthalic anhydride (E) and diethanolamine (F) for raw material, obtained EF2 type monomer; Adding TriMethylolPropane(TMP) is core, adopts one-step synthesis method super-branched polyesteramide, and carries out blocking modification with stearic acid to resulting polymers.By above synthesis technique, the polyesteramide delayer that we obtain, its consumption is little, and slack time is controlled with consumption, and do not affect the colloidal state after being cross-linked, compatibility is good.Effective delayed cross-linking effect can be played, have again the effect of regulating water quality pH value.
Compound gel breaker is made up of ammonium persulphate, hydrogen peroxide and peracetic acid, the gel breaker free radical eroding polymer gel that ammonium persulphate and peracetic acid generation actively enliven under the effect of temperature after entering stratum, hydrogen peroxide carries out dehydrogenation reaction under the effect of other superoxide, thus make polymericular weight and the decline of thickness ability reach brokenly the object of glue.
Fracturing fluid system needs good cross-link intensity, after pressure break completes, need intact frozen glue to use a certain amount of superoxide to carry out brokenly glue, because of the singularity of the singularity of seawater, the temperature resistance of fracturing fluid system and selected polymkeric substance and anti-salt multiple crosslinking agent, gel breaker is added after preparing base fluid during construction, require that gel breaker can not affect cold cross-linking, takes sand, the anti-shear performance of frozen glue, have simultaneously little, the broken glue of consumption rapidly, to advantages such as environment fanout free region.A kind of composite fluid gel breaker is have selected through test of many times research.Composite fluid gel breaker and ammonium persulphate, seawater base capsule breaker are carried out Experimental comparison, and experimental conditions is as table 6.
Experiment condition: in Sea Water of The Bohai Gulf, the seawater base instant dissolving viscosifier of 0.9% concentration, adds 0.8% anti-salt multiple crosslinking agent after adding the different gel breakers in table 3-5, places in 95 DEG C of water-baths after crosslinked, observes and detects broken glue and breaking glue solution viscosity.Special instruction: add again in the frozen glue liquid be cross-linked after capsule promotor needs pulverize.
The optimization experiment of table 6 different sorts gel breaker
In the present embodiment, demulsification cleanup agent uses XT-5B model demulsification cleanup agent, recommends consumption 0.2 ~ 0.3%.
Through experimental test, seawater itself has anti-swollen ability, and anti-dilative reaches 86%, does not therefore add any expansion-resisting agent in fracturing fluid system.
The index of table 7 industry standard and 95 DEG C of seawater base Instant heatproof fracturing fluid systems contrasts
Embodiment 2
Fracturing liquid in embodiment 2 is 140 DEG C of seawater base Instant heatproof fracturing fluid systems; Concrete formula is: seawater base instant dissolving viscosifier weight percent 1.0%, delayer weight percent 0.2%, the weight percent 0.2% of anti-salt multiple crosslinking agent weight percent 0.8%, demulsification cleanup agent weight percent 0.3%, gel breaker; All the other are seawater.
Fracturing fluid property in the present embodiment is as shown in table 8.
The index correlation data of table 8 industry standard and 140 DEG C of seawater base Instant heatproof fracturing fluid systems
The experimental data of table 7 and table 8 demonstrates the superperformance of 95 DEG C and 140 DEG C seawater base Instant heatproof fracturing fluid systems, is satisfied with the terms and conditions that site operation uses.The invention enables and utilize seawater resources to replace fresh water configuration fracturing liquid to be achieved, the Efficient Development of offshore oilfield is had great importance.
Above-mentioned example, just for illustration of the present invention, in addition, also has multiple different embodiment, and these embodiments to be all those skilled in the art can expect after comprehension inventive concept, therefore, will not enumerate at this.
Claims (10)
1. a viscosifying agent, is characterized in that, described viscosifying agent is take sulfonate as agent structure, is time polymkeric substance of main monomer synthesis with vinyl pyrrolidone, vinyl cyanide, cationic monomer; The weight ratio of sulfonate, vinyl pyrrolidone, vinyl cyanide, cationic monomer is: 9:2:4:1.
2. viscosifying agent as claimed in claim 1, it is characterized in that, described sulfonate is 2-acrylamide-2-methyl propane sulfonic acid salt.
3. viscosifying agent as claimed in claim 1, it is characterized in that, described cationic monomer is the one in methyl diallyl ammonium chloride, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride or acrylyl oxy-ethyl-trimethyl salmiac.
4. a preparation method for viscosifying agent as claimed in claim 1, is characterized in that, comprises the following steps:
1) with the disodium salt of the EDTA of concentration 0.02 mol/L, the function monomer that viscosifying agent formula materials forms is dissolved, add catalyzer and cause;
2) by the rapid water conservancy diversion of polymer tacky solution that caused to wide 100cm, be highly in the flat board of 1cm, according to the needs of monomer polymerization ability, in flat board, supplement a part of catalyzer;
3) tabular colloid is poured into kneader and carry out tensio-active agent process grafting repolymerization;
4) particle diameter of finished product polymer billet is reduced with column mill;
5) polymer billet is dried;
6) polymer billet is pulverized, sieve with 60 mesh sieve extension sets.
5. a seawater base Instant heatproof fracturing fluid system, is made up of viscosifying agent, delayer, linking agent, demulsification cleanup agent, gel breaker and seawater; It is characterized in that, described viscosifying agent is viscosifying agent as claimed in claim 1; The weight percent of viscosifying agent described in formula is 0.9% to 1%, the weight percent of described delayer is 0.1% to 0.2%, the weight percent of described linking agent is 0.7% to 0.8%, the weight percent of described demulsification cleanup agent is 0.2% to 0.3%, the weight percent 0.15% to 2% of described gel breaker, surplus is seawater.
6. seawater base Instant heatproof fracturing fluid system as claimed in claim 5, is characterized in that, described linking agent is be the organic zirconium of Material synthesis by trolamine, citric acid and zirconium oxychloride; Zirconium oxychloride: citric acid: the mol ratio of trolamine is 2:1:7, and temperature of reaction is 80 DEG C-90 DEG C, reaction times 4-6h.
7. seawater base Instant heatproof fracturing fluid system as claimed in claim 5, it is characterized in that, described delayer is polyesteramide delayer; Made by following steps:
1) with Tetra hydro Phthalic anhydride (E) and diethanolamine (F) for raw material, obtained EF2 type monomer;
2) adding TriMethylolPropane(TMP) is core, and the weight ratio of TriMethylolPropane(TMP) and EF2 type monomer is 1:10; Adopt one-step synthesis method super-branched polyesteramide, and with stearic acid, blocking modification is carried out to resulting polymers.
8. seawater base Instant heatproof fracturing fluid system as claimed in claim 5, it is characterized in that, described gel breaker is made up of ammonium persulphate, hydrogen peroxide and peracetic acid, and mol ratio is 1:1:1.
9. seawater base Instant heatproof fracturing fluid system as claimed in claim 5, it is characterized in that, the weight percent of described viscosifying agent is 0.9%.
10. seawater base Instant heatproof fracturing fluid system as claimed in claim 5, it is characterized in that, the weight percent of described viscosifying agent is 1%.
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| CN103275692A (en) * | 2013-06-25 | 2013-09-04 | 中国海洋石油总公司 | Seawater base fracturing fluid |
| CN104449643A (en) * | 2014-10-31 | 2015-03-25 | 中国石油天然气股份有限公司 | High-temperature-resistant polymer thickening agent for oil field fracturing fluid as well as preparation method and application of thickening agent |
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| CN109988550A (en) * | 2019-05-10 | 2019-07-09 | 四川洁能锐思石油技术有限公司 | A kind of instant crosslinked fracturing fluid system of methanol-based and its preparation method and application |
| CN110437817A (en) * | 2019-08-16 | 2019-11-12 | 中石化石油工程技术服务有限公司 | A kind of multi-functional emulsion-type salt tolerant fracturing fluid and preparation method thereof |
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