CN103808872A

CN103808872A - Test method for influence of barium scale solution concentration on anti-scale property of binary copolymerized anti-scale agent

Info

Publication number: CN103808872A
Application number: CN201210480443.6A
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 test method for influence of barium scale solution concentration on anti-scale property of a binary copolymerized anti-scale agent, comprising the following steps: (a) preparing a binary copolymerized anti-scale solution and a barium scale sample for later use; (b) selecting a plurality of experimental containers, cleaning and drying for later use; (c) then adding barium scale samples with different quantities into the experimental containers, and then adding solvents to mix into 6mg/l-18mg/l barium scale solution; (d) respectively adding binary copolymerized anti-scale solutions into the experimental containers; (e) respectively placing the experimental containers into water bath to heat; (f) respectively computing the descaling rate through the experimental result, and analyzing the influence of the barium scale solution concentration on the anti-scale property of the binary copolymerized anti-scale agent through the computing result. According to the invention, the influence of the barium scale solution concentration on the anti-scale property of the binary copolymerized anti-scale agent can be successfully tested, the test result is accurate, the test steps are simple, the test cost is low, and theoretical basis is provided for the binary copolymerized anti-scale agent applied to removing the barium scale.

Description

The method of testing of barium dirt solution concentration on the impact of binary copolymerization scale inhibitor anti-scaling property

Technical field

The present invention relates to the method for testing of a kind of barium dirt solution concentration on the impact of binary copolymerization scale inhibitor anti-scaling property.

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.

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 of a kind of barium dirt solution concentration on the impact of binary copolymerization scale inhibitor anti-scaling property is provided, this method of testing can successfully test out the impact of barium 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 barium dirt.

Object of the present invention is achieved through the following technical solutions: the method for testing of a kind of barium dirt solution concentration on the impact of binary copolymerization scale inhibitor anti-scaling property, comprises step: (a) first, prepare the dirty sample of binary copolymerization scale inhibitor solution and barium for subsequent use; (b) choose several experiment containers, cleaning-drying is for subsequent use; (c) then, respectively to the barium dirt samples that add different amounts in experiment container, and add solvent become 6mg/l～the barium dirt solution of 18mg/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 barium dirt solution concentration on binary copolymerization scale inhibitor anti-scaling property.

Described reaction vessel is beaker.

Described barium dirt sample is barium sulfate scale.

Described barium dirt solution concentration be 6mg/l, 8mg/l, 10mg/l, 12mg/l, 14mg/l, 16mg/l, 18mg/l.

In sum, the invention has the beneficial effects as follows: can successfully test out the impact of barium 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 barium dirt.

Accompanying drawing explanation

Fig. 1 is the schematic diagram that is related to of barium 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 of a kind of barium dirt solution concentration the present invention relates on the impact of binary copolymerization scale inhibitor anti-scaling property, comprises step: (a) first, prepare the dirty sample of binary copolymerization scale inhibitor solution and barium for subsequent use; (b) choose several experiment containers, cleaning-drying is for subsequent use; (c) then, respectively to the barium dirt samples that add different amounts in experiment container, and add solvent become 6mg/l～the barium dirt solution of 18mg/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 barium dirt solution concentration on binary copolymerization scale inhibitor anti-scaling property.

Described reaction vessel is beaker.

Described barium dirt sample is barium sulfate scale.

Setting NaCl content in solution is 10000 × 10-6g/l, pH=6, the Ba2+ 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 Ba2+ concentration on antiscaling rate, it the results are shown in Figure 1.As shown in Figure 1: as Ba2+ concentration 100mg/l, at 50 ℃, only need add 12mg/l multipolymer scale inhibitor can reach more than 80% antiscaling rate.Along with Ba2+ concentration raises, only have the dosage by increasing scale inhibitor to improve antiscaling rate, in the time that Ba2+ concentration exceedes 500mg/l, it is very poor that its 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. the method for testing of barium dirt solution concentration on the impact of binary copolymerization scale inhibitor anti-scaling property, is characterized in that, comprises step: (a) first, prepare the dirty sample of binary copolymerization scale inhibitor solution and barium for subsequent use; (b) choose several experiment containers, cleaning-drying is for subsequent use; (c) then, respectively to the barium dirt samples that add different amounts in experiment container, and add solvent become 6mg/l～the barium dirt solution of 18mg/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 barium dirt solution concentration on binary copolymerization scale inhibitor anti-scaling property.

2. the method for testing of barium dirt solution concentration according to claim 1 on the impact of binary copolymerization scale inhibitor anti-scaling property, is characterized in that, described reaction vessel is beaker.

3. the method for testing of barium dirt solution concentration according to claim 1 on the impact of binary copolymerization scale inhibitor anti-scaling property, is characterized in that, described barium dirt sample is barium sulfate scale.

4. the method for testing of barium according to claim 1 dirt solution concentration on the impact of binary copolymerization scale inhibitor anti-scaling property, is characterized in that, described barium dirt solution concentration be 6mg/l, 8mg/l, 10mg/l, 12mg/l, 14mg/l, 16mg/l, 18mg/l.