CN103804574A - Synthetic technology of binary copolymerization scale inhibitor based on control of monomer ratio - Google Patents
Synthetic technology of binary copolymerization scale inhibitor based on control of monomer ratio Download PDFInfo
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- CN103804574A CN103804574A CN201210480198.9A CN201210480198A CN103804574A CN 103804574 A CN103804574 A CN 103804574A CN 201210480198 A CN201210480198 A CN 201210480198A CN 103804574 A CN103804574 A CN 103804574A
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Abstract
The invention discloses a synthetic technology of a binary copolymerization scale inhibitor based on control of a monomer ratio. The synthetic technology comprises the following steps: (a) preparing a chelated group monomer and acrylamide according to a certain proportion, wherein the molar ratio of the chelated group monomer to the acrylamide is 4:6-8:2; (b) adding the chelated group monomer and the acrylamide to a reaction vessel, adding a solvent for dissolution, and adding a catalyst; (c) stirring and uniformly mixing the chelated group monomer and the acrylamide; (d) putting in water bath, and reacting for a period of time at a certain temperature so as to obtain a reaction product mixture; and (e) cooling the reaction product mixture, carrying out filtration treatment on the reaction product mixture, carrying out reduced pressure distillation on a liquid obtained after filtration, and separating so as to obtain the target product. The synthetic technology can be used for successfully synthesizing the binary copolymerization scale inhibitor; the synthesized binary copolymerization scale inhibitor has excellent performances; the synthetic steps are simple; the synthetic cost is low; and the scale inhibition performance of the target product is improved by controlling the monomer ratio in the reaction process.
Description
Technical field
The present invention relates to a kind of synthesis technique of the binary copolymerization scale inhibitor based on control monomer ratio.
Background technology
In oilfield exploitation procedure, fluid (oil, G&W) in hydrocarbon-bearing pool flows out from stratum, through pit shaft, well head to surface gathering system, due to the variation of the condition such as temperature, pressure and the thermodynamic phase of water and chemical incompatibility, cause oil gas water balance state to be destroyed.Often cause water filling stratum, tubing and casing, down-hole, uphole equipment and gathering system to occur fouling.Fouling has larger impact to the normal production of oil well, in the time that dirt deposition is on the equipment such as pit shaft, oil pipe, oil well pump, waterflood system, gathering system, heating system, can cause equipment not run well, heat transfer efficiency reduces, cause throughput to decline, and fouling also can cause the corrosion of equipment and pipeline, cause serious financial loss to oil field.
Existing scale inhibitor mainly contains aminopolycanboxylic acid's salt, organic multicomponent phosphonic acid based and organic polymer three major types.Aminopolycanboxylic acid's salt Chelate stability constants is large, can be used for comparatively high temps, but consumption is large, and cost is high; Organic multicomponent phosphonic acids to barium sulfate, Strontium Sulphate without antiscaling effect; And what mostly use is organic polymer scale inhibitor, uses monomer and maleic anhydride, acrylic acid copolymer to expect raising antiscaling rate more, but owing to fundamentally not changing polymer architecture, do not reach the antiscaling effect of expection.
In crude oil production process, fouling is a kind of ubiquitous phenomenon, and fouling is simultaneously one of the most serious problem running in the control of oil-field water water quality.Fouling has larger impact to the normal production of oil well, and dirt deposition can stop up formation pore, crack on stratum, cause permeability reduction, and crude production rate is declined, and even causes oil well to stop production when serious, and the oil reservoir lower on rate of permeation affects more very; In the time that dirt deposition is on the equipment such as pit shaft, oil pipe, oil well pump, waterflood system, gathering system, heating system, can cause equipment not run well, heat transfer efficiency reduces, cause throughput to decline, and fouling also can cause the corrosion of equipment and pipeline, cause serious financial loss to oil field.
The modal dirty type in oil field has calcite calcium carbonate (CaCO3), gypsum terra alba, anhydrite calcium sulfate (CaSO4), rock salt (NaCl), barite sulfate barium (BaSO4) and lazurite Strontium Sulphate (SrSO4).And the Strontium Sulphate of trace is often present in a large amount of barium sulfate, be difficult to them to separate.
The major cause of fouling is due to pressure or temperature change, evaporation or two kinds of water of 5 of mismatching mix mutually, make the inorganic salt (CaCO3, CaSO4 or BaSO4) that are originally present in the aqueous solution with ionic condition reach hypersaturated state, exceeded their solubleness and crystallize out into dirt.Fouling process is the process of certain density incrustation ion crystallization and gathering under certain physical and chemical condition (as pressure, temperature) and equipment surface situation.It is the basic reason that causes fouling that equilibrium state goes to pot.
For the various fouling situations in oil field, there are two class solutions: the one, scale removal; The 2nd, antiscale.Scale removal is a kind of remedial measures, and when scale removal, the corrosion that it has produced the underproduction and equipment, has caused larger financial loss, therefore, prevents that dirty generation is only a kind of good measure.In the method for antiscale, with chemical agent antiscale be people generally acknowledge the simplest, effectively, convenient, economic method.Therefore each oil field all adapts to the chemical scale inhibition agent of different condition for block the characteristic study separately.And develop the efficient scale inhibitor common objective that just generally pursue in each oil field especially.
In the process of synthetic binary copolymerization scale inhibitor, chelating group monomer is different with acrylamide proportioning, each group proportion difference in polymer macromolecule chain, polymkeric substance anti-scaling property difference.For scale inhibitor, while only having ratio when each group in macromolecular chain suitable, polymkeric substance just has good antiscaling effect.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of synthesis technique of the binary copolymerization scale inhibitor based on control monomer ratio is provided, this synthesis technique can successfully synthesize binary copolymerization scale inhibitor, and the excellent property of the binary copolymerization scale inhibitor synthesizing, synthesis step is simple, synthetic cost is low, and by controlling the monomer ratio in reaction process, thereby improve the anti-scaling property of target product.
Object of the present invention is achieved through the following technical solutions: a kind of synthesis technique of the binary copolymerization scale inhibitor based on control monomer ratio, comprises the following steps:
(a) first, prepare according to a certain percentage chelating group monomer and acrylamide, and according to molar ratio computing, the mol ratio of described chelating group monomer and acrylamide is 4: 6～8: 2;
(b) chelating group monomer and acrylamide are joined in reaction vessel, then add after dissolution with solvents, add catalyzer;
(c) stir and allow it fully mix;
(d) be placed in water-bath, react at a certain temperature after for some time, obtain mixture of reaction products;
(e) mixture of reaction products is cooling, and make filtration treatment, after filtering, liquid pressure-reducing distillation, obtains target product after separation.
Described reaction vessel is beaker.
In described step (e), carry out filtration treatment by molecular sieve.
In described step (e), carry out underpressure distillation by rotatory evaporator.
And according to molar ratio computing, the mol ratio of described chelating group monomer and acrylamide is 5: 5.
And according to molar ratio computing, the mol ratio of described chelating group monomer and acrylamide is 6: 4.
And according to molar ratio computing, the mol ratio of described chelating group monomer and acrylamide is 7: 3.
In sum, the invention has the beneficial effects as follows: can successfully synthesize binary copolymerization scale inhibitor, and the excellent property of the binary copolymerization scale inhibitor synthesizing, synthesis step is simple, synthetic cost is low, and by controlling the monomer ratio in reaction process, thereby improve the anti-scaling property of target product.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited only to this.
Embodiment:
The synthesis technique of a kind of binary copolymerization scale inhibitor based on control monomer ratio the present invention relates to, comprises the following steps:
(a) first, prepare according to a certain percentage chelating group monomer and acrylamide, and according to molar ratio computing, the mol ratio of described chelating group monomer and acrylamide is 4: 6～8: 2;
(b) chelating group monomer and acrylamide are joined in reaction vessel, then add after dissolution with solvents, add catalyzer;
(c) stir and allow it fully mix;
(d) be placed in water-bath, react at a certain temperature after for some time, obtain mixture of reaction products;
(e) mixture of reaction products is cooling, and make filtration treatment, after filtering, liquid pressure-reducing distillation, obtains target product after separation.
Described reaction vessel is beaker.
In described step (e), carry out filtration treatment by molecular sieve.
In described step (e), carry out underpressure distillation by rotatory evaporator.
And according to molar ratio computing, the mol ratio of described chelating group monomer and acrylamide is 5: 5.
And according to molar ratio computing, the mol ratio of described chelating group monomer and acrylamide is 6: 4.
And according to molar ratio computing, the mol ratio of described chelating group monomer and acrylamide is 7: 3.
Chelating group monomer is different with acrylamide proportioning, each group proportion difference in polymer macromolecule chain, polymkeric substance anti-scaling property difference.For scale inhibitor, while only having ratio when each group in macromolecular chain suitable, polymkeric substance just has good antiscaling effect.
Fixing initiator amount be monomer mass 0.5%, the mass ratio of water and monomer is 2: 1, when pH=7.0, change monomer ratio, at 75 ℃, react 5h and obtain multipolymer scale inhibitor, investigate the antiscaling rate impact of different monomers proportioning on BaSO4, SrSO4 dirt, the results are shown in shown in following table:
As seen from the above table: while not adding chelating group monomer in polymerization system, i.e. what polymerization obtained is polyacrylamide, it has certain scale effect to barium, strontium and calcium dirt, but antiscaling effect is very low; Along with the continuous increase of chelating group monomer consumption, antiscaling rate is in continuous increase, and in the time of its n (chelating group monomer): n (acrylamide)=6: 4, antiscaling rate reaches maximum value.From the intrinsic viscosity of chapter 3 homopolymer, can learn, chelating group monomer is compared with the difficult polymerization of acrylamide, and along with the consumption of chelating group monomer increases, the intrinsic viscosity of its polymkeric substance increases, and reflects that the molecular weight of polymerization is in continuous increase.The too large or too little antiscaling effect that is all unfavorable for scale inhibitor of molecular weight.The inhibitor mechanism of polyacrylamide scale inhibitor is take sequestering action as main simultaneously, along with the increase of chelating group monomer consumption, in multipolymer, anti-scaling property group content increases, from copolymer structure, easily with barium ion and the more stable ring-type inner complex of calcium ion formation, it is than stable many of the chelating of single polyacrylamide, what when the carboxyl ratio in copolymer molecule increases simultaneously, dissemination became is stronger, its antiscaling rate is also higher, make the inhibitor mechanism of chelating group monomer and acrylamide copolymer scale inhibitor take dissemination as main, also there is sequestering action.From antiscaling effect, the mol ratio of chelating group monomer and acrylamide is decided to be 6: 4 by this experiment.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction, every foundation technical spirit of the present invention, and any simple modification, equivalent variations that above embodiment is done, within all falling into protection scope of the present invention.
Claims (7)
1. the synthesis technique of the binary copolymerization scale inhibitor based on control monomer ratio, is characterized in that, comprises the following steps:
(a) first, prepare according to a certain percentage chelating group monomer and acrylamide, and according to molar ratio computing, the mol ratio of described chelating group monomer and acrylamide is 4: 6～8: 2;
(b) chelating group monomer and acrylamide are joined in reaction vessel, then add after dissolution with solvents, add catalyzer;
(c) stir and allow it fully mix;
(d) be placed in water-bath, react at a certain temperature after for some time, obtain mixture of reaction products;
(e) mixture of reaction products is cooling, and make filtration treatment, after filtering, liquid pressure-reducing distillation, obtains target product after separation.
2. the synthesis technique of the binary copolymerization scale inhibitor based on control monomer ratio according to claim 1, is characterized in that, described reaction vessel is beaker.
3. the synthesis technique of the binary copolymerization scale inhibitor based on control monomer ratio according to claim 1, is characterized in that, in described step (e), carries out filtration treatment by molecular sieve.
4. the synthesis technique of the binary copolymerization scale inhibitor based on control monomer ratio according to claim 1, is characterized in that, in described step (e), carries out underpressure distillation by rotatory evaporator.
5. the synthesis technique of the binary copolymerization scale inhibitor based on control monomer ratio according to claim 1, it is characterized in that, and according to molar ratio computing, the mol ratio of described chelating group monomer and acrylamide is 5: 5.
6. the synthesis technique of the binary copolymerization scale inhibitor based on control monomer ratio according to claim 1, it is characterized in that, and according to molar ratio computing, the mol ratio of described chelating group monomer and acrylamide is 6: 4.
7. the synthesis technique of the binary copolymerization scale inhibitor based on control monomer ratio according to claim 1, it is characterized in that, and according to molar ratio computing, the mol ratio of described chelating group monomer and acrylamide is 7: 3.
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Application publication date: 20140521 |