CN103808870A - Method for testing influence of dosage on anti-scaling performance of binary copolymerization anti-scaling agent - Google Patents
Method for testing influence of dosage on anti-scaling performance of binary copolymerization anti-scaling agent Download PDFInfo
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- CN103808870A CN103808870A CN201210480216.3A CN201210480216A CN103808870A CN 103808870 A CN103808870 A CN 103808870A CN 201210480216 A CN201210480216 A CN 201210480216A CN 103808870 A CN103808870 A CN 103808870A
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Abstract
The invention discloses a method for testing influence of dosage on anti-scaling performance of a binary copolymerization anti-scaling agent. The method comprises the steps: (a) firstly preparing binary copolymerization anti-scaling agent solutions and calcium scale samples for later use; (b) taking a plurality of experiment containers to wash and dry for later use; (c) then adding equal amounts of calcium scale samples into the experiment containers respectively and adding calcium ion solutions which are dissolved to different concentrations; (d) adding equal amounts of binary copolymerization anti-scaling agent solutions into the experiment containers respectively; (e) putting the experiment containers into a water bath to heat; (f) calculating the descaling rate of the binary copolymerization anti-scaling agent through experiment results and analyzing an anti-scaling effect of the binary copolymerization anti-scaling agent on the calcium scales. The method is capable of successfully testing the anti-scaling effect of the binary copolymerization anti-scaling agent on the calcium scales; meanwhile, the method is accurate in testing result, simple in testing steps and low in testing cost; through the method, theoretical basis is provided for the application of the binary copolymerization anti-scaling agent in calcium scale removal.
Description
Technical field
The present invention relates to the method for testing that a kind of anti-scaling property of binary copolymerization scale inhibitor is affected by consumption.
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 productive capacity to decline, and fouling also can cause the corrosion of equipment and pipeline, cause serious economic 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 higher temperature, but consumption is large, and cost is high; Organic multicomponent phosphonic acids to barium sulphate, strontium sulfate 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 water water quality control of oil field.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 permeability 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 productive capacity to decline, and fouling also can cause the corrosion of equipment and pipeline, cause serious economic loss to oil field.
The modal dirty type in oil field has calcite calcium carbonate (CaCO3), gypsum calcium sulphate dihydrate, muriacite calcium sulphate (CaSO4), rock salt (NaCl), barite sulfate barium (BaSO4) and celestite strontium sulfate (SrSO4).And the strontium sulfate of trace is often present in a large amount of barium sulphate, be difficult to them to separate.
The main 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 salts (CaCO3, CaSO4 or BaSO4) that are originally present in 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 economic 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.
The antiscaling effect of bipolymer is except with structure, functional group, the molecular weight of polymkeric substance and outside the Pass being distributed with, also relevant with the condition such as the multipolymer consumption using, solution acid-basicity, solution temperature.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, the method of testing that provides a kind of anti-scaling property of binary copolymerization scale inhibitor affected by consumption, the anti-scaling property that this method of testing can successfully test out binary copolymerization scale inhibitor is subject to the impact of consumption, and test result is accurate, testing procedure is simple, testing cost is low, provides theoretical foundation for binary copolymerization scale inhibitor is applied to deliming dirt.
Object of the present invention is achieved through the following technical solutions: the method for testing that a kind of anti-scaling property of binary copolymerization scale inhibitor is affected by consumption, comprises step: (a) first, prepare the dirty sample of binary copolymerization scale inhibitor solution and calcium for subsequent use; (b) choose several experiment containers, cleaning-drying is for subsequent use; (c) then, in experiment container, add the calcium dirt sample of equivalent respectively, and add solvent; (d) in experiment container, add the different binary copolymerization scale inhibitor solution of measuring respectively; (e) experiment container being placed in respectively to water-bath heats: (f) result by experiment, calculate respectively the descaling rate of binary copolymerization scale inhibitor, and by result of calculation, the anti-scaling property that analyzes binary copolymerization scale inhibitor is subject to the impact of consumption.
Described reaction vessel is beaker.
Described calcium dirt sample is calcium sulfate scale.
In described step (d), the consumption of binary copolymerization scale inhibitor is respectively 6mg/l, 8mg/l, 10mg/l, 12mg/l, 14mg/l, 16mg/l, 18mg/l.
In sum, the invention has the beneficial effects as follows: the anti-scaling property that can successfully test out binary copolymerization scale inhibitor is subject to the impact of consumption, and test result is accurate, and testing procedure is simple, testing cost is low, provides theoretical foundation for binary copolymerization scale inhibitor is applied to deliming dirt.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that is related to of binary copolymerization scale inhibitor consumption and antiscaling rate.
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 method of testing that the anti-scaling property of a kind of binary copolymerization scale inhibitor the present invention relates to is affected by consumption, comprises step: (a) first, prepare the dirty sample of binary copolymerization scale inhibitor solution and calcium for subsequent use; (b) choose several experiment containers, cleaning-drying is for subsequent use; (c) then, in experiment container, add the calcium dirt sample of equivalent respectively, and add solvent; (d) in experiment container, add the different binary copolymerization scale inhibitor solution of measuring respectively; (e) experiment container being placed in respectively to water-bath heats: (f) result by experiment, calculate respectively the descaling rate of binary copolymerization scale inhibitor, and by result of calculation, the anti-scaling property that analyzes binary copolymerization scale inhibitor is subject to the impact of consumption.
Described reaction vessel is beaker.
Described calcium dirt sample is calcium sulfate scale.
In described step (d), the consumption of binary copolymerization scale inhibitor is respectively 6mg/l, 8mg/l, 10mg/l, 12mg/l, 14mg/l, 16mg/l, 18mg/l.
Set respectively Ba2+ concentration (in BaSO4) and Sr2+ concentration (in SrSO4) in two kinds of solution and be 100mg/l, pH=7.0, constant temperature water bath (50 ± 1 ℃) 24h, the relation of discussion multipolymer antiscaling rate and multipolymer consumption, is shown in Fig. 1.As shown in Figure 1, at multipolymer consumption, during at 6mg/l～12mg/l, antiscaling rate is along with the consumption of multipolymer increases and increases; In the time that multipolymer consumption reaches 12mg/l, it is maximum that antiscaling rate reaches; When multipolymer consumption is during higher than 12mg/l, along with the increase of multipolymer consumption, antiscaling rate slightly reduces.In order to obtain good economic benefit, reduce costs, multipolymer consumption is suitable in the time of 12mg/l.
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 (4)
1. the anti-scaling property of binary copolymerization scale inhibitor is subject to the method for testing that consumption affects, and it is characterized in that, comprises step: (a) first, prepare the dirty sample of binary copolymerization scale inhibitor solution and calcium for subsequent use; (b) choose several experiment containers, cleaning-drying is for subsequent use; (c) then, in experiment container, add the calcium dirt sample of equivalent respectively, and add solvent; (d) in experiment container, add the different binary copolymerization scale inhibitor solution of measuring respectively; (e) experiment container being placed in respectively to water-bath heats: (f) result by experiment, calculate respectively the descaling rate of binary copolymerization scale inhibitor, and by result of calculation, the anti-scaling property that analyzes binary copolymerization scale inhibitor is subject to the impact of consumption.
2. the anti-scaling property of binary copolymerization scale inhibitor according to claim 1 is subject to the method for testing that consumption affects, and it is characterized in that, described reaction vessel is beaker.
3. the anti-scaling property of binary copolymerization scale inhibitor according to claim 1 is subject to the method for testing that consumption affects, and it is characterized in that, described calcium dirt sample is calcium sulfate scale.
4. the anti-scaling property of binary copolymerization scale inhibitor according to claim 1 is subject to the method for testing that consumption affects, it is characterized in that, in described step (d), the consumption of binary copolymerization scale inhibitor is respectively 6mg/l, 8mg/l, 10mg/l, 12mg/l, 14mg/l, 16mg/l, 18mg/l.
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| CN201210480216.3A CN103808870A (en) | 2012-11-13 | 2012-11-13 | Method for testing influence of dosage on anti-scaling performance of binary copolymerization anti-scaling agent |
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| CN201210480216.3A CN103808870A (en) | 2012-11-13 | 2012-11-13 | Method for testing influence of dosage on anti-scaling performance of binary copolymerization anti-scaling agent |
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Application publication date: 20140521 |