CN103808869A

CN103808869A - Method for testing influence of strontium scale solution concentration on anti-scale performance of binary copolymerization anti-scale agent

Info

Publication number: CN103808869A
Application number: CN201210480203.6A
Authority: CN
Inventors: 余婧
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-11-13
Filing date: 2012-11-13
Publication date: 2014-05-21

Abstract

The invention discloses a method for testing the influence of the strontium scale solution concentration on an anti-scale performance of a binary copolymerization anti-scale agent. The method comprises the following steps: (a) preparing a binary copolymerization anti-scale agent solution and a strontium scale sample for later use; (b) selecting multiple experiment containers, and cleaning and drying for later use; (c) respectively adding the strontium scale samples with different amounts into the experiment containers, and adding a solvent and mixing to form 3-15mg/l strontium scale solutions; (d) respectively adding the binary copolymerization anti-scale agent solution into the experiment containers; (e) respectively heating the experiment containers in water baths; and (f) respectively calculating the descaling rates through the experimental results, and analyzing the influence of the strontium scale solution concentration on the anti-scale performance of the binary copolymerization anti-scale agent through the calculation results. According to the method, the influence of the strontium scale solution concentration on the anti-scale performance of the binary copolymerization anti-scale agent can be successfully tested, the test results are accurate, the test steps are simple, the test cost is low, and a theoretical basis is provided for strontium scale removal by applying the binary copolymerization anti-scale agent.

Description

The method of testing that binary copolymerization scale inhibitor anti-scaling property is affected by strontium dirt solution concentration

Technical field

The present invention relates to the method for testing that a kind of binary copolymerization scale inhibitor anti-scaling property is affected by strontium dirt solution 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 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 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 modal dirty type in oil field has calcite calcium carbonate (CaCO3), gypsum calcium sulphate dihydrate, muriacite calcium sulphate (CaSO4), rock salt (NaCl), barite sulfate strontium (BaSO4) and celestite strontium sulfate (SrSO4).And the strontium sulfate of trace is often present in a large amount of strontium sulfates, 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.

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 binary copolymerization scale inhibitor anti-scaling property affected by strontium dirt solution concentration, this method of testing can successfully test out the impact of strontium dirt solution concentration on binary copolymerization scale inhibitor anti-scaling property, and test result is accurate, testing procedure is simple, testing cost is low, provides theoretical foundation for binary copolymerization scale inhibitor is applied to except strontium dirt.

Object of the present invention is achieved through the following technical solutions: the method for testing that a kind of binary copolymerization scale inhibitor anti-scaling property is affected by strontium dirt solution concentration, comprises step: (a) first, prepare the dirty sample of binary copolymerization scale inhibitor solution and strontium for subsequent use; (b) choose several experiment containers, cleaning-drying is for subsequent use; (c) then, respectively to the strontiums dirt samples that add different amounts in experiment container, and add solvent become 3mg/l～the strontium dirt solution of 15mg/l; (d) in experiment container, add binary copolymerization scale inhibitor solution respectively; (e) experiment container being placed in respectively to water-bath heats: (f) result by experiment, calculate respectively descaling rate, and by result of calculation, analyze the impact of strontium dirt solution concentration on binary copolymerization scale inhibitor anti-scaling property.

Described reaction vessel is beaker.

Described strontium dirt sample is strontium sulfate scale.

Described strontium dirt solution concentration be 3mg/l, 5mg/l, 7mg/l, 9mg/l, 11mg/l, 13mg/l, 15mg/l.

In sum, the invention has the beneficial effects as follows: can successfully test out the impact of strontium dirt solution concentration on binary copolymerization scale inhibitor anti-scaling property, and test result is accurate, testing procedure is simple, testing cost is low, provides theoretical foundation for binary copolymerization scale inhibitor is applied to except strontium dirt.

Accompanying drawing explanation

Fig. 1 is the schematic diagram that is related to of strontium dirt solution concentration and antiscaling effect.

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 binary copolymerization scale inhibitor anti-scaling property the present invention relates to is affected by strontium dirt solution concentration, comprises step: (a) first, prepare the dirty sample of binary copolymerization scale inhibitor solution and strontium for subsequent use; (b) choose several experiment containers, cleaning-drying is for subsequent use; (c) then, respectively to the strontiums dirt samples that add different amounts in experiment container, and add solvent become 3mg/l～the strontium dirt solution of 15mg/l; (d) in experiment container, add binary copolymerization scale inhibitor solution respectively; (e) experiment container being placed in respectively to water-bath heats: (f) result by experiment, calculate respectively descaling rate, and by result of calculation, analyze the impact of strontium dirt solution concentration on binary copolymerization scale inhibitor anti-scaling property.

Described reaction vessel is beaker.

Described strontium dirt sample is strontium sulfate scale.

Setting NaCl content in solution is 10000 × 10-6g/l, pH=6, the Sr2+ content in change solution and the dosage of multipolymer scale inhibitor, constant temperature water bath (50 ± 1 ℃) 24h, inquire into the impact of incrustation ion Sr2+ concentration on antiscaling rate, it the results are shown in Figure 1.As shown in Figure 1: in the time that Sr2+ concentration is 100mg/l, at 50 ℃, add 11mg/l scale inhibitor, its antiscale efficiency can reach more than 70%, along with the increase of Sr2+ concentration in solution, reach the consumption that good antiscaling effect need to strengthen scale inhibitor, in the time that Sr2+ concentration exceedes 500mg/l, it is very poor that antiscaling effect becomes.

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

1. binary copolymerization scale inhibitor anti-scaling property is subject to the method for testing that strontium dirt solution concentration affects, and it is characterized in that, comprises step: (a) first, prepare the dirty sample of binary copolymerization scale inhibitor solution and strontium for subsequent use; (b) choose several experiment containers, cleaning-drying is for subsequent use; (c) then, respectively to the strontiums dirt samples that add different amounts in experiment container, and add solvent become 3mg/l～the strontium dirt solution of 15mg/l; (d) in experiment container, add binary copolymerization scale inhibitor solution respectively; (e) experiment container being placed in respectively to water-bath heats: (f) result by experiment, calculate respectively descaling rate, and by result of calculation, analyze the impact of strontium dirt solution concentration on binary copolymerization scale inhibitor anti-scaling property.

2. binary copolymerization scale inhibitor anti-scaling property according to claim 1 is subject to the method for testing that strontium dirt solution concentration affects, and it is characterized in that, described reaction vessel is beaker.

3. binary copolymerization scale inhibitor anti-scaling property according to claim 1 is subject to the method for testing that strontium dirt solution concentration affects, and it is characterized in that, described strontium dirt sample is strontium sulfate scale.

4. binary copolymerization scale inhibitor anti-scaling property according to claim 1 is subject to the method for testing that strontium dirt solution concentration affects, and it is characterized in that, described strontium dirt solution concentration be 3mg/l, 5mg/l, 7mg/l, 9mg/l, 11mg/l, 13mg/l, 15mg/l.