CN105505357A - Chemical agent for improving quality of high-wax crude oil in situ and preparation method of chemical agent - Google Patents
Chemical agent for improving quality of high-wax crude oil in situ and preparation method of chemical agent Download PDFInfo
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- CN105505357A CN105505357A CN201510894528.2A CN201510894528A CN105505357A CN 105505357 A CN105505357 A CN 105505357A CN 201510894528 A CN201510894528 A CN 201510894528A CN 105505357 A CN105505357 A CN 105505357A
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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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- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
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Abstract
The invention provides a chemical agent for improving the quality of high-wax crude oil in situ and a preparation method of the chemical agent. The chemical agent is prepared from the following ingredients in percentage by weight: 5 to 45 percent of microcapsule urea dried powder or urea, 0.1 to 8 percent of isopropanol and the balance of water. The invention also provides the preparation method of the chemical agent. The preparation method comprises the following steps of dissolving the microcapsule urea dried powder or the urea and the isopropanol in water of which the temperature is 30 to 70 DEG C, and obtaining the chemical agent for improving the quality of the high-wax crude oil in situ, wherein a mass ratio between the microcapsule urea dried powder and the isopropanol is 1:1 to 10:1, or a mass ratio between the urea and an isopropanol water solution is 1:1 to 20:1, and the mass concentration of the isopropanol water solution is 0.1 to 8 percent. During an injection process of the chemical agent provided by the invention, a water-breakthrough passage can be temporarily blocked by capsulated particles, a water-flood sweep system is increased, and deep profile control can be realized, so that the recovery efficiency is increased.
Description
Technical field
The invention belongs to oilfield chemical technical field, relate to chemical agent of a kind of original position upgrading high wax content oil and preparation method thereof.
Background technology
Crude oil general wax content in the world's is higher, and China's major part crude oil is more famous with " three high ", and namely under high, the condensation point high and low temperature of wax content in crude oil, viscosity is high, and this rheological characteristic of crude oil is complicated.Waxy crude oil a kind ofly forms complicated mixture, and thermal history and the shearing of performance and component, experience have direct relation.Wherein the composition of wax, content, the form etc. of character in crude oil are the basic reasons causing rheological characteristic of crude oil complicated.Present stage, the method of main Paraffin Removal is heating, mechanical paraffin removal and chemical process, although these methods are effective, but only can solve immediate vicinity of wellbore or near wellbore prevention and remove wax deposit, and can be formed in the hole of oil reservoir for conventional waterflood overseas crude oil and analyse wax oil and do not have good effect temporarily.
Pit shaft or immediate vicinity of wellbore Paraffin Removal is applied to forms such as tensio-active agent, emulsifying agent, solvent or machineries in prior art, such as: Chinese patent application CN103923630A discloses a kind of emulsion wax removing agent, this wax removing agent comprises polyethylene polyamine ethylene oxide propylene oxide Soxylat A 25-7, fatty acid methyl ester ethoxylate sodium sulfonate and water; Chinese patent CN201210169266.X discloses the compound of a kind of amphoterics and nonionogenic tenside; Chinese patent CN201110216878.5 discloses a kind of biological Paraffin Removal technology; The people such as Zhang Hongli describe a kind of research of emulsion-type wax removing agent in " a kind of research of emulsion-type wax removing agent " (application chemical industry, 05 phase in 2011), form emulsion system after being mainly used in organic solvent and water soluble emulsifier mixing; The people such as Cao Huaishan describe a kind of oil soluble wax removing agent in " oil soluble wax removing agent CL-92 " (oilfield chemistry, phase calendar year 2001 04).
But, above-mentioned prior art only for the Paraffin Removal in immediate vicinity of wellbore or pit shaft, temporarily have no about in water drive process to the report of deep Paraffin Removal.
Summary of the invention
For the deficiencies in the prior art, the object of the present invention is to provide a kind of chemical agent of original position upgrading high wax content oil, this chemical agent can form small molecule crystals structure with waxy component complexing in crude oil, reducing in water drive process causes waxy component to analyse wax owing to injecting fluid temperature (F.T.), thus weaken the nonuniformity of oil reservoir, reduce and form water breakthrough passage.
In order to achieve the above object, the invention provides a kind of chemical agent of original position upgrading high wax content oil, by weight percentage, described chemical agent comprises following component: microcapsule urea dry powder or urea 5%-45%, Virahol 0.1-8%, surplus is water.
In above-mentioned chemical agent, preferably, by weight percentage, described chemical agent comprises following component: microcapsule urea dry powder or urea 5%-10%, Virahol 0.1-8%, surplus is water.
In above-mentioned chemical agent, preferably, the particle diameter of described microcapsule urea dry powder is 0.1 μm of-5mm; Be more preferably 20 μm-100 μm.
Again preferably, the particle diameter of described microcapsule urea dry powder is 20 μm-50 μm.
In above-mentioned chemical agent, preferably, the material of the capsule wall of described microcapsule urea dry powder comprises the combination of one or more in polyvinyl chloride, polyacrylamide, gelatin, petroleum wax and chitosan, is more preferably the petroleum wax of fusing point below 50 DEG C.
The present invention also provides the preparation method of above-mentioned chemical agent, comprises the following steps:
Microcapsule urea dry powder or urea, Virahol are dissolved in the water of 30-70 DEG C, obtain the chemical agent of original position upgrading high wax content oil;
Wherein, the mass ratio of described microcapsule urea dry powder and described Virahol is 1:1-10:1;
Or the mass ratio of described urea and isopropanol water solution is 1:1-20:1, the mass concentration of described isopropanol water solution is 0.1-8%.
In above-mentioned preparation method, preferably, microcapsule urea dry powder or urea, Virahol are dissolved in the water of 60-70 DEG C, obtain the chemical agent of original position upgrading high wax content oil.
In above-mentioned preparation method, preferably, the mass ratio of described microcapsule urea dry powder and described Virahol is 2:1-4:1; Or the mass ratio of described urea and isopropanol water solution is 1:1-3:1.
In above-mentioned preparation method, preferably, the preparation method of described microcapsule urea dry powder comprises oil-phase separating method and solvent evaporation method.
In above-mentioned preparation method, preferably, described microcapsule urea dry powder is obtained by solvent evaporation method, and this preparation method comprises the following steps:
Under 60-80 DEG C of condition, urea is soluble in water, then add emulsifying agent, form solution A;
Under 50-80 DEG C of condition, macromolecular material is dispersed in water formation mixed liquid B, or under 50-80 DEG C of condition, macromolecular material is melted into liquid formed polymer melt liquid C;
For 1:1-30:1, described solution A is slowly added in described mixed liquid B by volume, or melt in liquid C for described solution A is slowly added described polymer by 1:1-30:1 by volume;
Again at 50-80 DEG C, react after 2-5 hour, be then cooled to 10-30 DEG C, form white " milky " liquid;
By described milk sap precipitation, lyophilize, obtain microcapsule urea dry powder;
Wherein, in described mixed liquid B, the mass concentration of described macromolecular material is 2-5%;
With the total mass percentages of described solution A and described mixed liquid B or the total mass percentages melting liquid C with described solution A and described polymer, the mass concentration of described urea powder is 40-60%, and the mass concentration of described emulsifying agent is 0.5-5%.
In above-mentioned preparation method, preferably, under the agitation condition of agitator with 1000-2000r/min, described macromolecular material is dispersed in water, mixes, be mixed with mixed liquid B.
In above-mentioned preparation method, preferably, under the high-speed stirring condition of agitator with 10000-20000r/min, described solution A is slowly added in described mixed liquid B, and Keep agitation 1-5min, or under the high-speed stirring condition of agitator with 10000-20000r/min, described solution A is slowly added described polymer and melts in liquid C, and Keep agitation 1-5min;
Again at 50-80 DEG C, under the stirring at low speed condition of 100r/min-2000r/min, react 2-5 hour, be then cooled to 10-30 DEG C, form white " milky " liquid.
In above-mentioned preparation method, preferably, volume ratio when described solution A mixes with described mixed liquid B is 15:1.
In above-mentioned preparation method, preferably, described emulsifying agent comprises Polyethylene Octylphenol Ether (OP-10) and/or fatty alcohol-polyoxyethylene ether (AEO-9); Described macromolecular material comprises the combination of one or more in polyvinyl chloride, polyacrylamide, gelatin, petroleum wax and chitosan, is more preferably the petroleum wax of fusing point below 50 DEG C.
In above-mentioned preparation method, preferably, the method for described precipitation is centrifugal treating, and the rotating speed of this centrifugal treating is 2000-3000r/min, and the treatment time is 30-60min; More preferably, this centrifugal treating time is 30min.
In above-mentioned preparation method, preferably, described cryodesiccated temperature is at subzero 10-70 DEG C, pressure 0.01-0.005Pa, and the time is 5-24h.
The present invention also provides the application of a kind of above-mentioned chemical agent in water drive; Preferably, described water drive comprises the Paraffin Removal process to oil well medium and deep.
Urea can be used for the dewaxing of crude oil as sequestrant, and dominant mechanism utilizes waxy component and urea to form complex compound under middle cold condition, forms crystal structure with temperature change, thus reduces the wax content in crude oil, and crude oil condensation point also decreases; Utilize activator as: Virahol, ethanol etc., can increase activity, reduce complexation temperature.Side condition changes, and temperature reduces, and urea and waxy component crystallization form microlitic structure, avoids Yin Wendu reduction and causes the deposition of wax and solidify.Meanwhile, the displacement effect of entry well fluid can make complex compound flow out with crude oil, thus avoids the negative consequences such as wax deposit causes viscosity of crude to increase, reservoir heterogeneity increase.In injection process, encapsulated particulate energy temporary occlusion water breakthrough passage, increases water drive and involves system, can realize deep profile controlling, thus improve recovery ratio.
Accompanying drawing explanation
Fig. 1 is the electron-microscope scanning figure of the microcapsule urea dry powder that embodiment 1 is synthesized.
Fig. 2 is the electron-microscope scanning figure of the microcapsule urea dry powder that embodiment 1 is synthesized.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and beneficial effect, existing following detailed description is carried out to technical scheme of the present invention, but can not be interpreted as can the restriction of practical range to the present invention.
Embodiment 1
The preparation of microcapsule urea dry powder:
50ml water is heated to 60 DEG C, and under 500-1000r/min stirring at low speed, adds 100g urea fully dissolve, and then add 5ml emulsifying agent Polyethylene Octylphenol Ether (OP-10) and be uniformly dissolved, form solution A; Petroleum wax is heated to 60 DEG C, get the hot petroleum wax liquid of 50ml, as melting, liquid C is stand-by; Utilize IKAT-43 high speed dispersion instrument 10000r/min under maintenance 70 DEG C of conditions, solution A is joined melt in liquid C and stir 2min, form white " milky " liquid.Then utilize magnetic stirring apparatus to stir with 500r/min, and keep temperature 70 C, this milk sap of slaking 2h, then under whipped state slow cooling to 20 DEG C, form white tiny capsules particle.By this white tiny capsules particle with the centrifugal 30min of 3000r/min, then carry out solid, liquid separation, the solid particulate of acquisition is placed in freezing Vacuumdrier, under the pressure of the freezing temperature of-30 DEG C and 0.01-0.005Pa, place 20h, obtained microcapsule urea dry powder.
As shown in Figure 1, the size distribution of this microcapsule urea dry powder is 20-100 μm; As shown in Figure 2, in this microcapsule urea dry powder, most grain diameter is 20-50 μm.
The preparation of the chemical agent of original position upgrading high wax content oil:
The microcapsule urea dry composition of above-mentioned synthesis is become the aqueous solution, and wherein, with the weight percent meter of final original position upgrading chemical agent, this chemical agent (injection fluid) comprises the microcapsule urea dry powder 5% of synthesis, Virahol 2%, and surplus is water.
The chemical agent of dry for original position upgrading waxy crude oil is carried out simulation water drive process test
Test example 1
Utilize wax content be 38% high wax content oil (when 35 DEG C, the viscosity of this gas-free oil is 631mPas) saturated length under 55 DEG C of conditions be 20.5cm, the wide natural core for 2.5cm, the porosity of this natural core is 18.3%, rate of permeation 310.1mDa.Simulated field condition, 35 DEG C time, the waterflood recovery efficiency factor of crude oil is 12.1%, then injects 0.2PV water drive to 100% with the original position upgrading high wax content oil chemical agent that embodiment 1 is obtained moisture, improves waterflood recovery efficiency factor 3.2% when 35 DEG C.
Test example 2
Utilize wax content be 21% high wax content oil (when 35 DEG C, the viscosity of this gas-free oil is 232mPas) saturated length under 55 DEG C of conditions be 100cm, the wide sand for 2.5cm fills out pipe, this fill out sand tube 60-80 order, 100-120 order, 140-160 order natural river sand mix rear filling according to 1:2:2, and its rate of permeation is 745.5mDa, porosity is 26.5.Simulated field condition, the waterflood recovery efficiency factor of 35 DEG C is 19.2%, then injects 0.2PV water drive to 100% with the original position upgrading high wax content oil chemical agent that embodiment 1 is obtained moisture, improves waterflood recovery efficiency factor 5.1% when 35 DEG C.
Embodiment 2
The present embodiment provides a kind of original position upgrading chemical agent, and with its weight percent meter, this chemical agent (injection fluid) comprises the microcapsule urea dry powder 15% that embodiment 1 is synthesized, and Virahol 6%, surplus is water.
The chemical agent of dry for original position upgrading waxy crude oil is carried out simulation water drive process test
Test example 3
Utilize wax content be 38% high wax content oil (when 35 DEG C, the viscosity of this gas-free oil is 631mPas) saturated length under 55 DEG C of conditions be 100cm, the wide sand for 2.5cm fills out pipe, this fill out sand tube 60-80 order, 100-120 order, 140-160 order natural river sand mix rear filling according to 1:2:2, and its rate of permeation is 615.5mDa, porosity is 21.3.Simulated field condition, the waterflood recovery efficiency factor of 35 DEG C is 16.1%, then injects 0.2PV water drive to 100% with the original position upgrading high wax content oil chemical agent that embodiment 2 is obtained moisture, improves waterflood recovery efficiency factor 5.4% when 35 DEG C.
Embodiment 3
The present embodiment provides a kind of original position upgrading chemical agent, and with its weight percent meter, this chemical agent (injection fluid) comprises the microcapsule urea dry powder 30% that embodiment 1 is synthesized, and Virahol 6%, surplus is the hot water of 60 DEG C.
Test example 4
Utilize wax content be 38% high wax content oil (when 35 DEG C, the viscosity of this gas-free oil is 631mPas) saturated length under 55 DEG C of conditions be 100cm, the wide sand for 2.5cm fills out pipe, this fill out sand tube 60-80 order, 100-120 order, 140-160 order natural river sand mix rear filling according to 1:2:2, and its rate of permeation is 598.8mDa, porosity is 18.5.Simulated field condition, the waterflood recovery efficiency factor of 35 DEG C is 15.1%, then injects 0.2PV water drive to 100% with the original position upgrading high wax content oil chemical agent that embodiment 3 is obtained moisture, improves waterflood recovery efficiency factor 10.2% when 35 DEG C.
Embodiment 4
The present embodiment provides a kind of original position upgrading chemical agent, and with its weight percent meter, this chemical agent (injection fluid) comprises urea 35%, Virahol 5%, and surplus is the hot water of 60 DEG C.
Test example 5
Utilize wax content be 38% high wax content oil (when 35 DEG C, the viscosity of this gas-free oil is 631mPas) saturated length under 55 DEG C of conditions be 100cm, the wide sand for 2.5cm fills out pipe, this fill out sand tube 60-80 order, 100-120 order, 140-160 order natural river sand mix rear filling according to 1:2:2, and its rate of permeation is 691.1mDa, porosity is 23.2.Simulated field condition, the waterflood recovery efficiency factor of 35 DEG C is 14.1%, then injects 0.2PV water drive to 100% with the original position upgrading high wax content oil chemical agent that embodiment 4 is obtained moisture, improves waterflood recovery efficiency factor 9.2% when 35 DEG C.
Embodiment 5
The present embodiment provides a kind of original position upgrading chemical agent, and with its weight percent meter, this chemical agent (injection fluid) comprises urea 45%, Virahol 8%, and surplus is the hot water of 80 DEG C.
Test example 6
Utilize wax content be 38% high wax content oil (when 35 DEG C, the viscosity of this gas-free oil is 631mPas) saturated length under 55 DEG C of conditions be 100cm, the wide sand for 2.5cm fills out pipe, this fill out sand tube 60-80 order, 100-120 order, 140-160 order natural river sand mix rear filling according to 1:2:2, and its rate of permeation is 611.2mDa, porosity is 24.1.Simulated field condition, the waterflood recovery efficiency factor of 35 DEG C is 12%, then injects 0.2PV water drive to 100% with the original position upgrading high wax content oil chemical agent that embodiment 5 is obtained moisture, improves waterflood recovery efficiency factor 15.1% when 35 DEG C.
In sum, a kind of economically viable high wax content oil production technique is developed in the viscosity rising that after the present invention is directed to water drive, crude oil causes because of the content of wax.The dry waxy crude oil chemical agent of the original position upgrading that this technology provides can form small molecule crystals structure with the waxy component complexing in crude oil, reducing in water drive process causes waxy component to analyse wax owing to injecting fluid temperature (F.T.), thus weaken the nonuniformity of oil reservoir, reduce and form water breakthrough passage.In microcapsule urea dry powder, not consoluet solid particulate has filtration reduction simultaneously, can realize deep profile controlling and change fluid-channeling channel, avoid the negative consequences such as the viscosity of crude caused due to wax deposit at oil well medium and deep increases, reservoir heterogeneity increase.
Claims (10)
1. a chemical agent for original position upgrading high wax content oil, is characterized in that: by weight percentage, and described chemical agent comprises following component: microcapsule urea dry powder or urea 5%-45%, Virahol 0.1-8%, and surplus is water.
2. chemical agent according to claim 1, is characterized in that: by weight percentage, and described chemical agent comprises following component: microcapsule urea dry powder or urea 5%-10%, Virahol 0.1-8%, and surplus is water.
3. chemical agent according to claim 1 and 2, is characterized in that: the particle diameter of described microcapsule urea dry powder is 0.1 μm of-5mm, is preferably 20 μm-100 μm.
4. the chemical agent according to any one of claim 1-3, it is characterized in that: the material of the capsule wall of described microcapsule urea dry powder comprises the combination of one or more in polyvinyl chloride, polyacrylamide, gelatin, petroleum wax and chitosan, be preferably the petroleum wax of fusing point below 50 DEG C.
5. the preparation method of the chemical agent described in any one of claim 1-4, it comprises the following steps:
Microcapsule urea dry powder or urea, Virahol are dissolved in the water of 30-70 DEG C, obtain the chemical agent of original position upgrading high wax content oil;
Wherein, the mass ratio of described microcapsule urea dry powder and described Virahol is 1:1-10:1;
Or the mass ratio of described urea and isopropanol water solution is 1:1-20:1, the mass concentration of described isopropanol water solution is 0.1-8%.
6. preparation method according to claim 5, is characterized in that: the mass ratio of described microcapsule urea dry powder and described Virahol is 2:1-4:1;
Or the mass ratio of described urea and isopropanol water solution is 1:1-3:1.
7. the preparation method according to claim 5 or 6, is characterized in that: described microcapsule urea dry powder is obtained by following steps:
Under 60-80 DEG C of condition, urea is soluble in water, then add emulsifying agent, form solution A;
Under 50-80 DEG C of condition, macromolecular material is dispersed in water formation mixed liquid B, or under 50-80 DEG C of condition, macromolecular material is melted into liquid formed polymer melt liquid C;
For 1:1-30:1, described solution A is slowly added in described mixed liquid B by volume, or melt in liquid C for described solution A is slowly added described polymer by 1:1-30:1 by volume;
Again at 50-80 DEG C, react after 2-5 hour, be then cooled to 10-30 DEG C, form white " milky " liquid;
By described milk sap precipitation, lyophilize, obtain microcapsule urea dry powder;
Wherein, in described mixed liquid B, the mass concentration of described macromolecular material is 2-5%;
With the total mass percentages of described solution A and described mixed liquid B or the total mass percentages melting liquid C with described solution A and described polymer, the mass concentration of described urea powder is 40-60%, and the mass concentration of described emulsifying agent is 0.5-5%.
8. preparation method according to claim 7, is characterized in that: described emulsifying agent comprises Polyethylene Octylphenol Ether and/or fatty alcohol-polyoxyethylene ether;
Described macromolecular material comprises the combination of one or more in polyvinyl chloride, polyacrylamide, gelatin, petroleum wax and chitosan, is preferably the petroleum wax of fusing point below 50 DEG C.
9. the preparation method according to claim 7 or 8, is characterized in that: described cryodesiccated temperature is subzero 10-70 DEG C, and pressure is 0.01-0.005Pa, and the time is 5-24h.
10. the application of chemical agent in water drive of the original position upgrading high wax content oil described in any one of claim 1-4; Preferably described water drive comprises the Paraffin Removal process to oil well medium and deep.
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Application publication date: 20160420 |