CN103614128A - Microemulsion heavy wax crystal emulsifying dispersant applied to oil well for tertiary oil recovery - Google Patents
Microemulsion heavy wax crystal emulsifying dispersant applied to oil well for tertiary oil recovery Download PDFInfo
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- CN103614128A CN103614128A CN201310556318.3A CN201310556318A CN103614128A CN 103614128 A CN103614128 A CN 103614128A CN 201310556318 A CN201310556318 A CN 201310556318A CN 103614128 A CN103614128 A CN 103614128A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
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Abstract
The invention relates to a microemulsion heavy wax crystal emulsifying dispersant applied to an oil well for tertiary oil recovery, and is mainly used for solving the problem that the oil production rate is influenced due to the high return pressure and the short thermal washing period of the oil recovery well caused by that serious wax precipitations are generated by the oil well which contains thickened oil and is high in polymer flooding and viscosity. The emulsifying dispersant is prepared from the following components by weight percent: 1% to 3% of high-molecular polymer wax inhibitor, 13% to 25% of organic aromatic solvent, 1% to 3.5% of emulsifying agent, 8% to 12% of sulfonate, 10% to 12.5% of alcohol, 10% to 20% of demulsifier and 25% to 35% of water. The emulsifying dispersant has the dual effects of eliminating and preventing the waxy bitumen colloid precipitations with long molecular chains or high carbon number in crude oil from being precipitated, so that the wall sticking quantity of condensate oil is greatly decreased; the running load of the oil well is reduced; and the well washing period is prolonged. Thus, the oil production rate is improved.
Description
Technical field:
The present invention relates to the clear anti-wax technique of tertiary oil production in oil field oil well chemical field, especially a kind of brilliant emulsifying dispersant of microemulsion pyroparaffine that is applied to tertiary oil recovery oil well.
Background technology:
For extremely frigid zones oil field, the former innage content of wax, high condensation point, along with oil-field development enters the later stage, in the mixing liquid of oil well, heavy ingredient increases, and oil well and pipeline wax deposition are serious, and the bituminous matter of deposition, wax carbon number is high, matter is hard, be difficult to remove, particularly gather driven screw pump producing well, wax deposition is serious.Conventional surfactant type paraffin inhibitor chemical does not have wax removal effect, onset is slow, although tertiary oil recovery oil well is most of high moisture, but a small amount of oily wall built-up only containing is serious, cause oil well pump operating load large, cause that producing well back pressure is high, hot washing period is short, in the well that has winter one month, heat is washed three times, the shaft bottom water mixing operation of having to of some wells, makes moisture rising, affects oil offtake.
Summary of the invention:
The invention reside in and overcome the oil well paraffinication existing in background technology and seriously cause that producing well back pressure is high, the short problem that affects oil offtake of hot washing period, and a kind of brilliant emulsifying dispersant of microemulsion pyroparaffine that is applied to tertiary oil recovery oil well is provided.This is applied to the brilliant emulsifying dispersant of microemulsion pyroparaffine of tertiary oil recovery oil well, the waxy bitumen gum deposits thing of longer molecular chain or high carbon number in crude oil is had and removed and pre-antisiludging double effects, significantly reduce the sticky wall amount of solidifying oil, reduce oil well operating load, extend purge period, and then improve the object of production fluid.
The present invention solves its problem and can reach by following technical solution: this is applied to the brilliant emulsifying dispersant of microemulsion pyroparaffine of tertiary oil recovery oil well, and its component and proportioning are as follows by weight percentage: the sulfonate of 1-3% high molecular polymer paraffin inhibitor chemical, the organic aromatic solvent of 13-25%, 1-3.5% emulsifying agent, 8-12%, 10-12.5% alcohols, the emulsion splitter of 10-20%, 25-35% water.
Described high molecular polymer paraffin inhibitor chemical is phenylethylene-maleic anhydride-C
18high alcohol ester ter-polymers (SMA) or vinyl-vinyl acetate copolymer (EVA); Described organic aromatic solvent is benzene, p-Xylol, o-Xylol or toluene; Sulfonate is Sodium dodecylbenzene sulfonate or hexadecyl benzene sulfonic acid sodium salt; Described alcohols is methyl alcohol, ethanol, ethylene glycol or butanols; Described compound emulsifying agent is negatively charged ion surfactant and polymeric carboxylic, and negatively charged ion surfactant and polymeric carboxylic ratio are 1.7: 1; Described negatively charged ion surfactant is polymer fatty acid potassium, sodium, ammonium salt or triethanolamine salt; Polymeric carboxylic is C
16-20unsaturated olefin acid; Described emulsion splitter is the 1009-2 type emulsion splitter that the production and sales of general chemical plant left by Daqing oil field.
The brilliant emulsifying dispersant of microemulsion pyroparaffine rapid osmotic in oil well enters in water-in-oil emulsion, the sulfonic group with carboxylic acid group that dispersing property is good and strong polarity, emulsifying capacity is strong, emulsifying temperature is low, unique emulsified heavy oil, significantly reduces its viscosity, makes it to form O/W type milk sap, and be convenient to extraction, the easy breakdown of emulsion of crude oil after emulsification.The concrete mechanism of action is as follows:
1, the oil soluble high molecular polymer in microemulsion, organic solvent are due to mixed phase, and density is large, and more single-phase organic solvent more easily arrives shaft bottom, dissolve fast and disperse pyroparaffine brilliant, make subsurface pump body cavity body deposition pyroparaffine crystalline substance interior and pipe bar wall fluff loose.Bioactive molecule enters between resin and asphalt sheet molecule by strong formation hydrogen bond ability and infiltration, dissemination, the loose overlapping aggregate forming of piling up of plane of part folding, make to cause that become loose, order degree of the overlapping structure of piling up aggregate of the full-bodied plane being formed with hydrogen bonded by colloid, bituminous matter of crude oil reduces, thereby plays viscosity reduction effect.
2, the penetrance of micro emulsion liquor uniqueness, having hypertonicity and strong dispersed tensio-active agent can infiltrate in the brilliant asphalt colloid of loosely organized wax gap, can make the cohesive force between wax molecule and pipe bar wall weaken, thereby cause wax crystalline substance to be broken and be scattered in oil stream, with Produced Liquid, flow out oil well, thereby play wax removal effect;
3, complexed surfactant activity is greater than the surfactivity of naturally occurring emulsifying agent in crude oil, make system there is lower oil water interfacial tension, form O/w emulsion, easily be attracted to metallic surface and change Wettability of Solid Surface, make wax deposition surface be reversed to water-wetted surface by oleophylic, stop nonpolar wax crystalline substance in absorption and the deposition of metallic surface, wetting one deck polarity moisture film that forms on tubing wall, be conducive to coming off and preventing its adventitious deposit of waxy bitumen gum deposits thing in crude oil, have and remove and pre-antisiludging double effects, significantly reduce the sticky wall amount of solidifying oil.
The present invention compares and can have following beneficial effect with above-mentioned background technology: this is applied to the brilliant emulsifying dispersant of microemulsion pyroparaffine of tertiary oil recovery oil well, for oil-in-water-type translucent to transparent micro emulsion stabilising system.Its oil base disperse phase particle size is between 0.01～0.1 μ m, and evenly, microscope is invisible, all miscible within the specific limits with water, oil-based solvent for particle size.This micro emulsion liquor has long-term storage stable performance under surface condition, not volatile, and smell toxicity is little, safe, and waxy bitumen gum deposits thing in crude oil is had and removed and pre-antisiludging double effects, significantly reduces the sticky wall amount of solidifying oil.
Embodiment:
Below in conjunction with specific embodiment, the invention will be further described:
Embodiment 1
3g compound emulsifying agent preparation: the C that takes 1.9g sodium oleate, 1.1g
18unsaturated olefin acid mixes;
Take SAM, 3g compound emulsifying agent, 18g dimethylbenzene, 12g sodium sulfonate, 12g methyl alcohol, the 1009-2 type emulsion splitter of 20g, the 33g water of 2g, the brilliant emulsifying dispersant of mixed preparing pyroparaffine.
Embodiment 2
3.5g compound emulsifying agent preparation: the C that takes 2.2g sodium oleate, 1.3g
18unsaturated olefin acid mixes;
Take SAM, 3.5g compound emulsifying agent, 25g dimethylbenzene, 10g sodium sulfonate, 10g methyl alcohol, the 1009-2 type emulsion splitter of 20g, the 29.5g water of 2g, the brilliant emulsifying dispersant of mixed preparing pyroparaffine.
This brilliant emulsifying dispersant effect of field application of microemulsion pyroparaffine that is applied to tertiary oil recovery oil well is evaluated as:
The brilliant emulsifying dispersant of this microemulsion pyroparaffine recovers the oil six factories, the seven factory's rig-site utilization oil well effects of recovering the oil and the contrast of traditional medicament in Table 1 at Daqing oil field:
Table 1
The poly-driven screw pump producing well L3-PS2627 electric current amount of increase of six factories is effectively controlled, at the bottom of shut-in well, after water mixing, can normally move, the poly-driven screw pump producing well hot washing period of L7-AS2225 extended to 65 days from 30 days, can reduce once heat and wash in two months, can reduce heat individual well year and wash 6 wells.The seven water drive 7E266-78 of factory well electric current falls are large, greatly reduce producing well operating load, and successful is better than than traditional conventional dose, and the poly-effect driving is more outstanding.
The brilliant emulsifying dispersant laboratory experiment of this microemulsion pyroparaffine effect is:
1, reduce the sticky wall amount performance evaluation of solidifying oil in Table 2:
Table 2
Example 1, example 2 effects are fine, and example 2 is applied to poly-the driving of six ,Si factories of factory, and its inhibiting rate for wax precipitation is greater than 91.5%, and the water drive well on the beam inhibiting rate for wax precipitation that example 1 is applied to Periphery Oilfield is greater than 77%.
2, to the dispersing property evaluation of wax crystalline substance in Table 3
Tool lid triangular flask, water bath with thermostatic control, 10 mesh standard sieves (aperture 2mm), electronic balance, 58
#industry Chinese wax
Table 3
The brilliant scatter coefficient of wax of the brilliant emulsifying dispersant of microemulsion wax is 95%, and what higher than standard value, require is greater than 80%.
Claims (6)
1. the brilliant emulsifying dispersant of microemulsion pyroparaffine that is applied to tertiary oil recovery oil well, its component and proportioning are as follows by weight percentage: the sulfonate of 1-3% high molecular polymer paraffin inhibitor chemical, the organic aromatic solvent of 13-25%, 1-3.5% emulsifying agent, 8-12%, 10-12.5% alcohols, the emulsion splitter of 10-20%, 25-35% water.
2. a kind of brilliant emulsifying dispersant of microemulsion pyroparaffine that is applied to tertiary oil recovery oil well according to claim 1, is characterized in that: described high molecular polymer paraffin inhibitor chemical is phenylethylene-maleic anhydride-C
18high alcohol ester ter-polymers or vinyl-vinyl acetate copolymer.
3. a kind of brilliant emulsifying dispersant of microemulsion pyroparaffine that is applied to tertiary oil recovery oil well according to claim 1, is characterized in that: described organic aromatic solvent is benzene, p-Xylol, o-Xylol or toluene; Described sulfonate is Sodium dodecylbenzene sulfonate or hexadecyl benzene sulfonic acid sodium salt; Described alcohols is methyl alcohol, ethanol, ethylene glycol or butanols.
4. the brilliant emulsifying dispersant of a kind of microemulsion pyroparaffine that is applied to tertiary oil recovery oil well according to claim 1, it is characterized in that: described compound emulsifying agent is negatively charged ion surfactant and polymeric carboxylic, negatively charged ion surfactant and polymeric carboxylic ratio are 1.7: 1.
5. a kind of brilliant emulsifying dispersant of microemulsion pyroparaffine that is applied to tertiary oil recovery oil well according to claim 4, is characterized in that: described negatively charged ion surfactant is polymer fatty acid potassium, sodium, ammonium salt or triethanolamine salt; Polymeric carboxylic is C
16-20unsaturated olefin acid.
6. a kind of brilliant emulsifying dispersant of microemulsion pyroparaffine that is applied to tertiary oil recovery oil well according to claim 1, is characterized in that: described emulsion splitter is that the 1009-2 type emulsion splitter that general chemical plant produces left by Daqing oil field.
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