CN103837642A - Method for testing influence of pH value on scale inhibition rate of chelating terpolymer scale inhibitor - Google Patents
Method for testing influence of pH value on scale inhibition rate of chelating terpolymer scale inhibitor Download PDFInfo
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- CN103837642A CN103837642A CN201210471524.XA CN201210471524A CN103837642A CN 103837642 A CN103837642 A CN 103837642A CN 201210471524 A CN201210471524 A CN 201210471524A CN 103837642 A CN103837642 A CN 103837642A
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Abstract
The invention discloses a method for testing the influence of the pH value on the scale inhibition rate of a chelating terpolymer scale inhibitor. The method comprises the following steps: 1, preparing a chelating terpolymer scale inhibitor solution and a scale sample for later use; 2, selecting a plurality of experiment containers, cleaning, and drying; 3, respectively adding a same amount of the scale sample into the experiment containers, adding a solvent, and mixing; 4, respectively adding a same amount of the chelating terpolymer scale inhibitor into the experiment containers, and adjusting the obtained solutions to different pH values; 5, respectively heating the experiment containers in water baths with a same temperature; and 6, respectively calculating according to experiment results to obtain the scale inhibition rates of the chelating terpolymer scale inhibitor under different pH values. The method can successfully test the scale inhibition rates of the chelating terpolymer scale inhibitor under different pH values, has the advantages of accurate test result, simple test step and low test cost, and provides a theoretic basis for the application of the chelating terpolymer scale inhibitor in scale removal.
Description
Technical field
The present invention relates to the method for testing that a kind of chelating type ternary polymerization scale inhibitor antiscaling rate is affected by pH value.
Background technology
In oilfield exploitation procedure, fluid (oil, G&W) in hydrocarbon-bearing pool flows out from stratum, to surface gathering system, due to the variation of condition and the thermodynamic phase of water and chemical incompatibilities such as pH value, pressure, cause oil gas water balance state to be destroyed through pit shaft, well head.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 pH value, 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 main cause of fouling is due to pressure or the change of pH value, 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, pH value) 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 chelating type ternary polymerization scale inhibitor antiscaling rate affected by pH value, this method of testing can successfully test out the antiscaling rate of chelating type ternary polymerization scale inhibitor under different pH values, 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 chelating type ternary polymerization scale inhibitor antiscaling rate is affected by pH value, 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 same amount respectively, and add solvent; (d) respectively to the chelating type ternary polymerization scale inhibitor that adds same amount in experiment container, regulator solution is different pH value; (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 pH values.
Described reaction vessel is beaker.
Described chelating type ternary polymerization scale inhibitor consumption is respectively 8mg/L.
Described pH value is 3,5,7,9,11,13.
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 pH values, 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.
Brief description of the drawings
Fig. 1 is the antiscaling rate schematic diagram of chelating type ternary polymerization scale inhibitor under different pH values.
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 chelating type ternary polymerization scale inhibitor antiscaling rate the present invention relates to is affected by pH value, 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 same amount respectively, and add solvent; (d) respectively to the chelating type ternary polymerization scale inhibitor that adds same amount in experiment container, regulator solution is different pH value; (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 pH values.
Described reaction vessel is beaker.
Described chelating type ternary polymerization scale inhibitor consumption is respectively 8mg/L.
Described pH value is 3,5,7,9,11,13.
As shown in Figure 1, as shown in Figure 1, along with the increase gradually of pH value, the antiscaling effect of polymer scale inhibitor is reducing the result recording according to said method.Under acid condition, the content of carboxyl in polymkeric substance (-COOH) increases, increased molecular surface mean charge density, easy and high-valency metal incrustation ion chelating generates the ring-type complex compound that energy is lower, makes Ba2+, Sr2+ not generate precipitation with SO42-combination; Along with alkaline enhancing, this effect weakens gradually, has produced oxyhydroxide crystal settling simultaneously and has also caused polymkeric substance antiscaling rate sharply to decline.Therefore this scale inhibitor is adapted at using under acidity or neutrallty condition.
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 method for testing that chelating type ternary polymerization scale inhibitor antiscaling rate is affected by pH value, 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 same amount respectively, and add solvent; (d) respectively to the chelating type ternary polymerization scale inhibitor that adds same amount in experiment container, regulator solution is different pH value; (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 pH values.
2. the method for testing that chelating type ternary polymerization scale inhibitor antiscaling rate according to claim 1 is affected by pH value, is characterized in that, described reaction vessel is beaker.
3. the method for testing that chelating type ternary polymerization scale inhibitor antiscaling rate according to claim 1 is affected by pH value, is characterized in that, described chelating type ternary polymerization scale inhibitor consumption is respectively 8mg/L.
4. the method for testing that chelating type ternary polymerization scale inhibitor antiscaling rate according to claim 1 is affected by pH value, is characterized in that, described pH value is 3,5,7,9,11,13.
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| CN201210471524.XA CN103837642A (en) | 2012-11-20 | 2012-11-20 | Method for testing influence of pH value on scale inhibition rate of chelating terpolymer scale inhibitor |
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| CN201210471524.XA CN103837642A (en) | 2012-11-20 | 2012-11-20 | Method for testing influence of pH value on scale inhibition rate of chelating terpolymer scale inhibitor |
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Application publication date: 20140604 |