CN103837641A - Method for testing influence of sulfate ion concentration on scale inhibition rate of terpolymer scale inhibitor - Google Patents
Method for testing influence of sulfate ion concentration on scale inhibition rate of terpolymer scale inhibitor Download PDFInfo
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- CN103837641A CN103837641A CN201210471497.6A CN201210471497A CN103837641A CN 103837641 A CN103837641 A CN 103837641A CN 201210471497 A CN201210471497 A CN 201210471497A CN 103837641 A CN103837641 A CN 103837641A
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Abstract
The invention discloses a method for testing the influence of the sulfate ion concentration on the scale inhibition rate of a terpolymer scale inhibitor. The method comprises the following steps: 1, preparing a chelating terpolymer scale inhibitor solution and a barium scale sample for later use; 2, selecting a plurality of experiment containers, and cleaning and drying the experiment containers for later use; 3, respectively adding different amounts of the scale sample to the experiment containers, and adding a solvent to form a solution with the sulfate ion concentrations in a range of 100-800mg/L; 4, respectively adding a same amount of a chelating terpolymer scale inhibitor to the experiment containers; 5, respectively heating the experiment containers in water baths having a same temperature; and 6, calculating according to experiment results to obtain the scale inhibition rates of the chelating terpolymer scale inhibitor under different sulfate ion concentrations. The method enables the scale inhibition rates of the chelating terpolymer scale inhibitor under different sulfate ion concentrations to be successfully tested, has the advantages of accurate test result, simple test steps and low test cost, and provides a theoretic basis for the application of the chelating terpolymer scale inhibitor in scale inhibition.
Description
Technical field
The present invention relates to the method for testing that a kind of ternary polymerization scale inhibitor antiscaling rate is affected by sulfate ion concentration.
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 sulfate ion concentration, 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 sulfate ion concentration, but consumption is large, and cost is high; Organic multicomponent phosphonic acids to strontium sulfate, 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 main cause of fouling is due to pressure or sulfate ion concentration 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, sulfate ion concentration) and equipment surface situation.It is the basic reason that causes fouling that equilibrium state goes to pot.
Chemical scale inhibition agent is the gentle technology of separating fouling of inhibition that oil field is commonly used the most.In order to prevent fouling, ground flow, oil well and water-injection plant need be connected or in system, add scale inhibitor off and on.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.
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 ternary polymerization scale inhibitor antiscaling rate affected by sulfate ion concentration, this method of testing can successfully test out the antiscaling rate of chelating type ternary polymerization scale inhibitor under different sulfate ion concentrations, and test result is accurate, testing procedure is simple, testing cost is low, provides theoretical foundation for chelating type ternary polymerization scale inhibitor is applied to scale removal.
Object of the present invention is achieved through the following technical solutions: the method for testing that a kind of ternary polymerization scale inhibitor antiscaling rate is affected by sulfate ion concentration, comprises step: (a) first, prepare chelating type ternary polymerization scale inhibitor solution and dirty sample for subsequent use; (b) choose several experiment containers, cleaning-drying is for subsequent use; (c) then, in experiment container, add the dirty sample of different amounts respectively, and add solvent to form the solution that sulfate ion concentration is 100mg/L～800mg/L; (d) respectively to the chelating type ternary polymerization scale inhibitor that adds same amount in experiment container; (e) water-bath that experiment container is placed in respectively to uniform temp is heated: (f) result by experiment, calculates respectively the antiscaling rate of chelating type ternary polymerization scale inhibitor under different sulfate ion concentrations.
Described reaction vessel is beaker.
Described strontium dirt is strontium sulfate scale.
Described sulfate ion concentration is respectively 100mg/L, 200mg/L, 400mg/L, 600mg/L, 800mg/L.
In sum, the invention has the beneficial effects as follows: can successfully test out the antiscaling rate of chelating type ternary polymerization scale inhibitor under different sulfate ion concentrations, and test result is accurate, testing procedure is simple, testing cost is low, provides theoretical foundation for chelating type ternary polymerization scale inhibitor is applied to scale removal.
Accompanying drawing explanation
Fig. 1 is the antiscaling rate schematic diagram of chelating type ternary polymerization scale inhibitor under different sulfate ion concentrations.
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 a kind of ternary polymerization scale inhibitor antiscaling rate the present invention relates to is affected by sulfate ion concentration, comprises step: (a) first, prepare chelating type ternary polymerization scale inhibitor solution and dirty sample for subsequent use; (b) choose several experiment containers, cleaning-drying is for subsequent use; (c) then, in experiment container, add the dirty sample of different amounts respectively, and add solvent to form the solution that sulfate ion concentration is 100mg/L～800mg/L; (d) respectively to the chelating type ternary polymerization scale inhibitor that adds same amount in experiment container; (e) water-bath that experiment container is placed in respectively to uniform temp is heated: (f) result by experiment, calculates respectively the antiscaling rate of chelating type ternary polymerization scale inhibitor under different sulfate ion concentrations.
Described reaction vessel is beaker.
Described strontium dirt is strontium sulfate scale.
Described sulfate ion concentration is respectively 100mg/L, 200mg/L, 400mg/L, 600mg/L, 800mg/L.
It is 8mg/l that fixed polymer scale inhibitor adds concentration, pH=7.0, constant temperature water bath (50 ± 1 ℃) 24h, change SO42-concentration, concentration rises to 800mg/l from 100mg/l, investigates polymer scale inhibitor antiscaling effect to barium sulphate, strontium sulfate scale under different sulfate ion concentrations, it the results are shown in Figure shown in 1, as shown in Figure 1, along with the increase of SO42-concentration in solution, the antiscaling effect of polymkeric substance is in obvious decline.Its reason is that the increase of sulfate ion concentration is accelerated the speed that generates BaSO4, SrSO4 precipitation in solution, and the antiscaling effect of polymkeric substance is sharply declined.
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. ternary polymerization scale inhibitor antiscaling rate is subject to the method for testing that sulfate ion concentration affects, and it is characterized in that, comprises step: (a) first, prepare chelating type ternary polymerization scale inhibitor solution and dirty sample for subsequent use; (b) choose several experiment containers, cleaning-drying is for subsequent use; (c) then, in experiment container, add the dirty sample of different amounts respectively, and add solvent to form the solution that sulfate ion concentration is 100mg/L～800mg/L; (d) respectively to the chelating type ternary polymerization scale inhibitor that adds same amount in experiment container; (e) water-bath that experiment container is placed in respectively to uniform temp is heated: (f) result by experiment, calculates respectively the antiscaling rate of chelating type ternary polymerization scale inhibitor under different sulfate ion concentrations.
2. the method for testing that ternary polymerization scale inhibitor antiscaling rate according to claim 1 is affected by sulfate ion concentration, is characterized in that, described reaction vessel is beaker.
3. the method for testing that ternary polymerization scale inhibitor antiscaling rate according to claim 1 is affected by sulfate ion concentration, is characterized in that, described strontium dirt is strontium sulfate scale.
4. the method for testing that ternary polymerization scale inhibitor antiscaling rate according to claim 1 is affected by sulfate ion concentration, is characterized in that, described sulfate ion concentration is respectively 100mg/L, 200mg/L, 400mg/L, 600mg/L, 800mg/L.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210471497.6A CN103837641A (en) | 2012-11-20 | 2012-11-20 | Method for testing influence of sulfate ion concentration on scale inhibition rate of terpolymer scale inhibitor |
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| CN201210471497.6A CN103837641A (en) | 2012-11-20 | 2012-11-20 | Method for testing influence of sulfate ion concentration on scale inhibition rate of terpolymer scale inhibitor |
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| CN103837641A true CN103837641A (en) | 2014-06-04 |
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| CN201210471497.6A Pending CN103837641A (en) | 2012-11-20 | 2012-11-20 | Method for testing influence of sulfate ion concentration on scale inhibition rate of terpolymer scale inhibitor |
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Application publication date: 20140604 |