CN107365574A - A kind of viscosity reduction oil displacement agent for common heavy oil reservoir and preparation method thereof - Google Patents
A kind of viscosity reduction oil displacement agent for common heavy oil reservoir and preparation method thereof Download PDFInfo
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- CN107365574A CN107365574A CN201710454509.7A CN201710454509A CN107365574A CN 107365574 A CN107365574 A CN 107365574A CN 201710454509 A CN201710454509 A CN 201710454509A CN 107365574 A CN107365574 A CN 107365574A
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- 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 discloses it is a kind of for common heavy oil reservoir, viscosity reducing effect it is good, with stratum compatible it is good, the low-tension viscosity reduction oil displacement agent of ultralow interfacial tension can be formed with crude oil, consist of the following components in percentage by weight：Alkyl alcohol ethoxylates sulfuric acid 30~50%, nonionic surfactant 15~25%, anion surfactant 15~25%, organic solvent 2~5%, sodium chloride 0.1~3%, water 5~25%.In use, the viscosity reduction oil displacement agent of the present invention forms composite oil-displacing system with polyacrylamide polymers.On the one hand, increase aqueous viscosity using polyacrylamide polymers, reduce water-oil mobility ratio, expansion involves and profile control.On the other hand, oil water interfacial tension is reduced using the viscosity reduction oil displacement agent of the present invention, improves oil displacement efficiency, while reduce viscosity of crude, further improve water-oil mobility ratio.Both realize that common heavy oil reservoir increases substantially recovery ratio at synergy.
Description
Technical field
The present invention relates to a kind of low-tension drop being applied to common heavy oil reservoir, can improving common heavy oil reservoir recovery ratio
Viscous oil displacement agent and preparation method thereof, belongs to oil recovery technique field.
Background technology
As consumption of petroleum amount is increasing, it is available for the conventional oil stock number of exploitation fewer and fewer, develops heavy crude reservoir
It is significant for solving the contradiction of petroleum resources shortage.According to China's viscous crude criteria for classification, common heavy oil refers to oil reservoir
Under the conditions of 50~1000mPas of viscosity of crude crude oil, the viscosity of crude of its class common heavy oil of Central Asia -1 is 50~100mPa
S, the viscosity of crude of sub- -2 class common heavy oils is 100~1000mPas.Because common heavy oil viscosity is big, water-oil mobility ratio is high,
Water drive sweep efficiency is low, therefore conventional recovery ratio of normal heavy oil reservoirs in water-flooding development is relatively low.
Polymer flooding is a kind of technological means of conventional raising oil recovery, its general principle be by polymer come
Aqueous viscosity is improved, so as to reduce water-oil mobility ratio, improve sweep efficiency.Although polymer flooding has substantially to conventional crude oil reservoir
Decreasing water cut and increasing oil effect, but poor to the higher common heavy oil reservoir oil displacement efficiency of viscosity, this mainly has two aspect reasons：It is first
First, the polymer viscosity that exploitation common heavy oil reservoir needs is higher, but under the conditions of high temperature and high salt oil deposit, conventional polypropylene acid amides
Polymer is acted on by high temperature degradation, high salt degraded, and the viscosity of polymer solution is greatly lowered, and causes polymer to aqueous phase
Efficient Adhesive Promotion it is very limited.Secondly, for the stronger viscous crude of viscous force, polymer is difficult that the remaining oil in blowhole is driven
Go out.Polymer flooding is used alone to be difficult to meet the oil field such as China's triumph, Henan high temperature and high salt common heavy oil reservoir Efficient Development
Need.
The content of the invention
For above-mentioned prior art, the invention provides it is a kind of for common heavy oil reservoir, viscosity reducing effect is good and stratum
Compatible is good, ultralow interfacial tension can be formed with crude oil (is less than 1 × 10-2MN/m low-tension viscosity reduction oil displacement agent), and its system
Preparation Method.The composite oil-displacing system that the oil displacement agent of the present invention is formed with polyacrylamide polymers, can either expand and involve, and can
Oil displacement efficiency is enough improved, the recovery ratio of common heavy oil reservoir can be effectively improved.
The present invention is achieved by the following technical solutions：
A kind of viscosity reduction oil displacement agent for common heavy oil reservoir, consist of the following components in percentage by weight：Alkyl
Alcohol polyoxyethylene ether sulfate 30~50%, nonionic surfactant 15~25%, anion surfactant 15~
25%, organic solvent 2~5%, sodium chloride 0.1~3%, water 5~25%；
The nonionic surfactant is selected from sorbitol polyoxyethylene ether, AEO, anhydrous sorbitol
One kind or any two or more combination in fatty acid ester；
The anion surfactant is selected from sodium hexadecyl sulfate, lauryl sodium sulfate, DBSA
One kind or any two or more combination in sodium, odium stearate；
The one kind or any two or more combination of the organic solvent in ethanol, ethylene glycol, isopropanol.
The preparation method of the viscosity reduction oil displacement agent for common heavy oil reservoir, comprises the following steps：
(1) at normal temperatures and pressures, by nonionic surfactant, organic solvent, and the 45%~55% of total Water is accounted for
Water add reactor, stir 1~3 hour；
(2) anion surfactant is added into reactor, stirs 0.5~2 hour, then add remaining water, and
Sodium chloride, stir；
(3) alkyl alcohol ethoxylates sulfuric acid is added into reactor, is well mixed, produces oil displacement agent finished product.
In use, the viscosity reduction oil displacement agent of the present invention forms composite oil-displacing system with polyacrylamide polymers.On the one hand, it is sharp
Increase aqueous viscosity with polyacrylamide polymers, reduce water-oil mobility ratio, expansion involves and profile control.On the other hand, this is utilized
The viscosity reduction oil displacement agent of invention reduces oil water interfacial tension, improves oil displacement efficiency, while reduces viscosity of crude, further improves water oil
Mobility ratio.Both realize that common heavy oil reservoir increases substantially recovery ratio at synergy.
The viscosity reduction oil displacement agent of the present invention, using alkyl alcohol ethoxylates sulfuric acid as primary surfactant, with nonionic
Surfactant, anion surfactant, organic solvent and sodium chloride are auxiliary agent.The present invention viscosity reduction oil displacement agent can with it is thick
Oil forms oil-in-water emulsion, effectively reduces viscosity of thickened oil, viscous force of the oil phase in blowhole is declined to a great extent.Together
When, viscosity reduction oil displacement agent of the invention can reduce oil water interfacial tension, increase capillary number, make crude oil be easier to flow, further
Improve oil displacement efficiency.
The viscosity reduction oil displacement agent of the present invention, 85 DEG C are not higher than suitable for reservoir temperature, formation water salinity is less than 50000mg/
L, calcium ions and magnesium ions concentration are less than 2000mg/L, 150~1000mPas of underground crude oil viscosity common heavy oil reservoir.
The viscosity reduction oil displacement agent of the present invention, compared with prior art, has advantages below：
(1) composite oil-displacing system that low-tension viscosity reduction oil displacement agent and polymer are formed, during applied to common heavy oil reservoir, tool
Having preferably reduces viscosity of crude with improving the ability of recovery ratio.
(2) low-tension viscosity reduction oil displacement agent can effectively reduce oil water interfacial tension, with total salinity 50000mg/L, wherein calcium
The concentrated water compatibility that magnesium ion concentration is up to 2000mg/L is good, and reduces interfacial tension ability not by salinity shadow
Ring.
Embodiment
With reference to embodiment, the present invention is further illustrated.
Involved instrument, reagent, material etc. in following embodiments, it is existing in the prior art unless otherwise noted
Conventional instrument, reagent, material etc., can be obtained by regular commercial sources.Involved experimental method in following embodiments, inspection
Survey method etc., it is existing normal experiment method, detection method etc. in the prior art unless otherwise noted.
Following embodiments are raw materials used to select industrial raw material.
Embodiment 1 prepares viscosity reduction oil displacement agent
Group is grouped into：Alkyl alcohol ethoxylates sulfuric acid 50kg, sorbitol polyoxyethylene ether 5kg, poly alkyl alcohol
Oxygen vinethene 5kg, sorbitan fatty acid ester 5kg, sodium hexadecyl sulfate 7kg, neopelex 8kg, isopropyl
Alcohol 3kg, sodium chloride 1kg, water 16kg.
Step is as follows：
(1) at normal temperatures and pressures, by sorbitol polyoxyethylene ether, AEO, sorbitan fatty acid
Ester, isopropanol, 8kg (the 50% of total Water) water add reactor, are sufficiently stirred 2 hours；
(2) sodium hexadecyl sulfate, neopelex are added into aforesaid reaction vessel, after stirring 1 hour, more than addition
Under 8kg water, and be uniformly added into sodium chloride powder, be stirred until homogeneous, form auxiliary agent；
(3) alkyl alcohol ethoxylates sulfuric acid is added into reactor, is well mixed with above-mentioned auxiliary agent, produces oil displacement agent
Finished product.
Embodiment 2 prepares viscosity reduction oil displacement agent
Group is grouped into：Alkyl alcohol ethoxylates sulfuric acid 40kg, AEO 25kg, cetyl
Sodium sulphate 5kg, lauryl sodium sulfate 5kg, neopelex 5kg, ethylene glycol 2kg, sodium chloride 1kg, water 17kg.
Preparation method is the same as embodiment 1.
Embodiment 3 prepares viscosity reduction oil displacement agent
Group is grouped into：Alkyl alcohol ethoxylates sulfuric acid 45kg, sorbitol polyoxyethylene ether 10kg, poly alkyl alcohol
Oxygen vinethene 10kg, sodium hexadecyl sulfate 5kg, lauryl sodium sulfate 5kg, neopelex 5kg, odium stearate
5kg, ethylene glycol 3kg, sodium chloride 2kg, water 10kg.
Preparation method is the same as embodiment 1.
Embodiment 4 prepares viscosity reduction oil displacement agent
Group is grouped into：Alkyl alcohol ethoxylates sulfuric acid 40kg, sorbitan fatty acid ester 15kg, sorbierite
APEO 5kg, sodium hexadecyl sulfate 7kg, lauryl sodium sulfate 10kg, odium stearate 8kg, ethanol 2kg, sodium chloride
1kg, water 12kg.
Preparation method is the same as embodiment 1.
Embodiment 5 prepares viscosity reduction oil displacement agent
Group is grouped into：Alkyl alcohol ethoxylates sulfuric acid 40kg, sorbitan fatty acid ester 10kg, fatty alcohol
APEO 10kg, neopelex 7kg, odium stearate 8kg, isopropanol 4kg, sodium chloride 1kg, water 20kg.
Preparation method is the same as embodiment 1.
The low-tension viscosity reduction oil displacement agent of experimental example 1 reduces the ability of oil water interfacial tension
0.1% is prepared using the pungent note sewage forever (total salinity 28623mg/L, calcium ions and magnesium ions content 1407mg/L) in east
(percetage by weight, similarly hereinafter), 0.2%, 0.3%, 0.4%, 0.5% low-tension viscosity reduction displacement of reservoir oil agent solution (low-tension drop used
Viscous oil displacement agent is prepared by embodiment 3), determine interfacial tension using TX500C types interfacial tensimeter, 75 DEG C of test temperature, 8P3 forever
Well viscous crude, test result are as shown in table 1.Low-tension viscosity reduction oil displacement agent is in 0.1%~0.5% concentration range Nei Junkeshi profits circle
Face tension force reaches ultralow.
Table 1
The viscosity reduction ability of the low-tension viscosity reduction oil displacement agent of experimental example 2
Low-tension viscosity reduction displacement of reservoir oil agent solution using the pungent note waste water 0.1%, 0.3%, 0.5% forever in east is (used low
Tension force viscosity reduction oil displacement agent is prepared by embodiment 3), in profit volume ratio 50:50、30:70、70:High temperature and high pressure flow is used under the conditions of 30
Become the viscosity of instrument measure oil water mixture, viscosity-reducing performance is characterized with viscosity break ratio.75 DEG C of test temperature, 8P3 wells viscous crude is (at 50 DEG C forever
Viscosity of crude is 2170mPas, and viscosity of crude is 465mPas at 75 DEG C), test result is as shown in table 2.Low-tension viscosity reduction
Oil displacement agent can make reducing thick oil viscosity rate reach more than 90% in 0.3%~0.5% concentration range.
Table 2
The compatibility of the low-tension viscosity reduction oil displacement agent of experimental example 3 and polymer
0.5% displacement of reservoir oil partially hydrolyzed polyacrylamide (PHPA) polymer mother liquor (polymer molecular weight is prepared using Huanghe water
20000000 or so) after, being stored at room temperature 12 hours, with polymer solution of the pungent note dilution of sewage forever in east into 0.2%.To polymer
(low-tension viscosity reduction oil displacement agent used is that embodiment 3 is made to the low-tension viscosity reduction oil displacement agent of addition 0.1%, 0.3%, 0.5% in solution
It is standby), after being completely dissolved, at 75 DEG C, shear rate 7.34s-1Under conditions of with HTHP rheometer determine low-tension viscosity reduction
The apparent viscosity of oil displacement agent and polymer combination solution, test result are as shown in table 3.Low-tension viscosity reduction oil displacement agent has to polymer
The effect of thickening.
Table 3
The oil displacement test of the composite oil-displacing system of experimental example 4
A note simulation water forever is prepared, 0.3% low-tension viscosity reduction oil displacement agent (the low-tension viscosity reduction displacement of reservoir oil used is prepared with simulation water
Agent is prepared by embodiment 3)+0.2% polymer composite oil-displacing system.Oil displacement test is non-using the two-tube modeling of quartz sand filling
Homogeneous Reservoir condition, model permeability are 800:2500×10-3μm2, the saturation 8P3 crude oil forever at 75 DEG C.By the mould of saturation
For type water drive to aqueous 94%, metaideophone composite oil-displacing system slug 0.3PV, water drive to continuous aqueous more than 98% stops experiment.It is real
Test result to show, ultimate recovery 59.4%, waterflood recovery efficiency factor 30.5%, the injection mode improves recovery ratio than water drive
28.9%.
Although above-mentioned the embodiment of the present invention is described in conjunction with the embodiments, not the present invention is protected
The limitation of scope, one of ordinary skill in the art should be understood that on the basis of technical scheme, those skilled in the art
Various modifications or deformation that creative work can make need not be paid still within protection scope of the present invention.
Claims (9)
- A kind of 1. viscosity reduction oil displacement agent for common heavy oil reservoir, it is characterised in that：It is by following components in percentage by weight group Into：Alkyl alcohol ethoxylates sulfuric acid 30~50%, nonionic surfactant 15~25%, anion surface active Agent 15~25%, organic solvent 2~5%, sodium chloride 0.1~3%, water 5~25%；The nonionic surfactant is selected from sorbitol polyoxyethylene ether, AEO, sorbitan fatty One kind or any two or more combination in acid esters；The anion surfactant is selected from sodium hexadecyl sulfate, lauryl sodium sulfate, neopelex, hard One kind or any two or more combination in resin acid sodium；The one kind or any two or more combination of the organic solvent in ethanol, ethylene glycol, isopropanol.
- 2. the viscosity reduction oil displacement agent according to claim 1 for common heavy oil reservoir, it is characterised in that：It is by following weight The component composition of part：Alkyl alcohol ethoxylates sulfuric acid 50kg, sorbitol polyoxyethylene ether 5kg, fatty alcohol polyoxy second Alkene ether 5kg, sorbitan fatty acid ester 5kg, sodium hexadecyl sulfate 7kg, neopelex 8kg, isopropanol 3kg, sodium chloride 1kg, water 16kg.
- 3. the viscosity reduction oil displacement agent according to claim 1 for common heavy oil reservoir, it is characterised in that：It is by following weight The component composition of part：Alkyl alcohol ethoxylates sulfuric acid 40kg, AEO 25kg, hexadecyl hydrosulfate Sodium 5kg, lauryl sodium sulfate 5kg, neopelex 5kg, ethylene glycol 2kg, sodium chloride 1kg, water 17kg.
- 4. the viscosity reduction oil displacement agent according to claim 1 for common heavy oil reservoir, it is characterised in that：It is by following weight The component composition of part：Alkyl alcohol ethoxylates sulfuric acid 45kg, sorbitol polyoxyethylene ether 10kg, fatty alcohol polyoxy second Alkene ether 10kg, sodium hexadecyl sulfate 5kg, lauryl sodium sulfate 5kg, neopelex 5kg, odium stearate 5kg, Ethylene glycol 3kg, sodium chloride 2kg, water 10kg.
- 5. the viscosity reduction oil displacement agent according to claim 1 for common heavy oil reservoir, it is characterised in that：It is by following weight The component composition of part：Alkyl alcohol ethoxylates sulfuric acid 40kg, sorbitan fatty acid ester 15kg, sorbierite polyoxy Vinethene 5kg, sodium hexadecyl sulfate 7kg, lauryl sodium sulfate 10kg, odium stearate 8kg, ethanol 2kg, sodium chloride 1kg, Water 12kg.
- 6. the viscosity reduction oil displacement agent according to claim 1 for common heavy oil reservoir, it is characterised in that：It is by following weight The component composition of part：Alkyl alcohol ethoxylates sulfuric acid 40kg, sorbitan fatty acid ester 10kg, fatty alcohol polyoxy Vinethene 10kg, neopelex 7kg, odium stearate 8kg, isopropanol 4kg, sodium chloride 1kg, water 20kg.
- 7. the preparation method of the viscosity reduction oil displacement agent according to any one of claims 1 to 6 for common heavy oil reservoir, its feature It is：Comprise the following steps：(1) at normal temperatures and pressures, by nonionic surfactant, organic solvent, and 45%~55% water of total Water is accounted for Reactor is added, is stirred 1~3 hour；(2) anion surfactant is added into reactor, stirs 0.5~2 hour, then add remaining water, and chlorination Sodium, stir；(3) alkyl alcohol ethoxylates sulfuric acid is added into reactor, is well mixed, produces.
- 8. the viscosity reduction oil displacement agent according to any one of claims 1 to 6 for common heavy oil reservoir is improving common heavy oil oil Hide the application in recovery ratio.
- 9. application according to claim 8, it is characterised in that：During concrete application, the viscosity reduction oil displacement agent and polyacrylamide Amine polymer forms composite oil-displacing system, injects stratum.
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| CN118658552A (en) * | 2024-08-16 | 2024-09-17 | 中国石油大学(华东) | An oil displacement agent with both tension and adhesion reduction functions and its design method and application |
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