CN102732243B - Oil-displacing agent for binary oil displacement and binary oil displacement mining method of oil field - Google Patents
Oil-displacing agent for binary oil displacement and binary oil displacement mining method of oil field Download PDFInfo
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- CN102732243B CN102732243B CN201210232704.2A CN201210232704A CN102732243B CN 102732243 B CN102732243 B CN 102732243B CN 201210232704 A CN201210232704 A CN 201210232704A CN 102732243 B CN102732243 B CN 102732243B
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Abstract
The invention relates to an oil-displacing agent for binary oil displacement and a binary oil displacement mining method of an oil field. The oil-displacing agent for binary oil displacement comprises the following materials by weight: 0.05-0.4% of a main agent, 0.01-0.2% of assistant, 0.001-0.005% of a dispersing agent and the balance of water, wherein the main agent is acrylate polymer, and the assistant is one or combination of polyoxyethylene sorbitan organic acid ester and alkyl polysaccharide anhydride. The binary oil displacement mining method of the oil field, provided by the invention, comprises a step of carrying out oil displacement work by injecting the oil-displacing agent for binary oil displacement into an oil well, wherein before the oil displacement work, the degree of mineralization of the oil-displacing agent for binary oil displacement is adjusted to a target oil deposit value by utilizing a regulator for degree of mineralization. The oil-displacing agent for binary oil displacement, provided by the invention, has the advantages of simple and easily obtained raw materials, less amount and higher recovery efficiency, especially under a low permeability condition.
Description
Technical field
The present invention relates to oil-displacing agent and oil field binary displacement oil reoovery method for a kind of binary displacement oil, belong to technical field of petroleum extraction.
Background technology
Tertiary oil recovery technology has become one of most important oil recovery technique of China's maturing field at present.Because the existence of highly basic in ternary built composite reservoir oil displacement system has caused a series of rear shop problems such as fouling, corrosion and Produced Liquid oily water separation difficulty, make polymkeric substance/tensio-active agent (P/S) binary combination flooding technology become one of main attack technology of tertiary oil recovery.But the requirement to chemical agent performance in binary combination flooding system is higher, require oil-displacing agent interfacial tension in the medium of alkali-free to reach ultralow (10
-3mN/m) be inconvenient.In industrial oil-displacing agent, host mostly was aniorfic surfactant (sulfonated petro-leum, alkylbenzene sulfonate, heavy alkylbenzene sulfonate, petroleum carboxylate etc.) in the past, had the interfacial tension of many tensio-active agents can reach ultralow in strong base ternary composite driving system.But the chemical agent that can be used in polymkeric substance/tensio-active agent binary combination flooding system still lacks excellent performance, cheap Industrial products at present.
CN101445722A discloses a kind of surfactant for low-permeability oilfield oil-displacing agent that is suitable for, wherein the weight percent of each component is: heavy alkylbenzene sulfonate or sulfonated α-olefin are 38-70%, anionic sulphonate Gmini type tensio-active agent is 5-8%, nonionogenic tenside is 5-15%, organic solvent is 2-5%, water is 18-50%, described anionic sulphonate Gmini type tensio-active agent is 5, 5 '-dinonyl-2, 2 '-(glycol ether oxygen base) two benzene sulfonates, 5, 5 '-dinonyl-2, 2 '-(Triethylene glycol oxygen base) two benzene sulfonates or 5, 5 '-dinonyl-2, a kind of or its any mixture in 2 '-(tetraethylene-glycol oxygen base) two benzene sulfonates, nonionogenic tenside is one or more the mixture in nonyl phenol Pluronic F-127 ether, sorbitol polyoxyethylene ether, glycerol fatty acid ester and sorbitan fatty acid ester, organic solvent is one or more mixtures in Virahol, propyl carbinol, isopropylcarbinol.This oil-displacing agent (80 ℃) under comparatively high temps can effectively reduce oil water interfacial tension and reach 10
-3mN/m, more than can improving the about 20%OOIP of recovery ratio with the binary combination flooding system of polymer formation.
CN1865392A discloses a kind of highly efficiency compositional oil-displacing agent that is applied to tertiary oil recovery, this oil-displacing agent comprises 50-70% sulfonated petro-leum by weight percentage, 15-25% nonionogenic tenside, 5-10% anion surfactant, 2-5% organic solvent, 0.1-3% sodium-chlor and 5-25% water.Described nonionogenic tenside is one or more the mixture in nonyl phenol polyethylene oxide ether, sorbitol polyoxyethylene ether, glycerol fatty acid ester, sorbitan fatty acid ester.Described anion surfactant is one or more the mixture in Sodium palmityl sulfate, sodium lauryl sulphate, Sodium dodecylbenzene sulfonate, sodium stearate.After water drive, utilize this oil-displacing agent and polyacrylamide polymers to carry out binary combination flooding and improve recovery ratio more than 20%, polyacrylamide polymers is driven rear binary combination flooding and is improved recovery ratio more than 10%.
Above two kinds of oil-displacing agent systems contain 4 kinds of above compositions, have all used organic solvent, have substantially represented the compositing characteristic of existing ternary built composite reservoir oil displacement agent, and host is aniorfic surfactant, and oil-displacing agent cost is higher.
Summary of the invention
For solving the problems of the technologies described above, the object of the present invention is to provide a kind of new binary displacement oil oil-displacing agent, Industrial products in other field application (being only not necessarily tensio-active agent) are prepared and met displacement of reservoir oil demand, form simple binary combination flooding chemical system, the problem that overcomes cheap, the environment-friendly type binary combination flooding agent that forms simple, excellent performance of lacking of existing in prior art, this oil-displacing agent has the feature functional, recovery ratio is higher.
The present invention also aims to provide the oil exploitation method that adopts above-mentioned binary displacement oil to use oil-displacing agent.
For achieving the above object, first the present invention provides a kind of binary displacement oil oil-displacing agent, and by weight percentage, this binary displacement oil comprises with oil-displacing agent: the dispersion agent of the host of 0.05-0.4%, the assistant agent of 0.01-0.2%, 0.001-0.005%, and surplus is water; Wherein, the polymkeric substance that host is acrylate, assistant agent is one or more the combination in polyoxyethylene sorbitol anhydride of organic acid ester and alkyl polysaccharide acid anhydride etc.; Preferably, above-mentioned polyoxyethylene sorbitol anhydride of organic acid ester is polyoxyethylene sorbitol acid anhydride carboxylicesters.
In the medium that above-mentioned oil-displacing agent provided by the invention is 3000-30000mg/L in total mineralization, all there is good adaptability, can prepare oil-displacing agent solution according to the amount of the salinity of the local water in each oil field.
The present invention adopts the polymkeric substance of acrylate as host, add in addition and there is the assistant agent of appropriate emulsification, dissemination and to there is the oil-displacing agent that the assistant agent of certain wettability reversal effect prepares, adopt this oil-displacing agent can in LOW PERMEABILITY RESERVOIR, obtain good recovery ratio.At above-mentioned binary displacement oil provided by the invention, with in oil-displacing agent, host is mutually combined and can be played a kind of action effect that exceeds single dose with assistant agent, strengthens emulsification, de-oiling, washing oil and infiltration, involves function.
At above-mentioned binary displacement oil provided by the invention, with in oil-displacing agent, preferably, the mass ratio of host and assistant agent may be controlled to 2-40: 1.
At above-mentioned binary displacement oil provided by the invention, with in oil-displacing agent, preferably, the polymkeric substance of the acrylate adopting comprises one or more the combination in polyacrylic acid potassium, sodium polyacrylate, sodium polymethacrylate and ammonium polyacrylate etc.More preferably, the host adopting is sodium polyacrylate.Any is that the sodium polyacrylate that can be used as water conditioner well known by persons skilled in the art all can be used for the present invention, can directly use, and also can use with its solution form.This sodium polyacrylate is preferably the sodium polyacrylate that meets HG/T 2838-1997 chemical industry standard, and for example, solid content is>=30wt% that free monomer is (with CH
2=CH-COOH meter) content is 0.5-1wt%, the sodium polyacrylate that pH value is 6-8.More preferably, sodium polyacrylate of the present invention is the sodium polyacrylate of solid content 30-50wt%.In the present invention, the solid content of sodium polyacrylate is identical with the implication of solid content in HG/T2838-1997 chemical industry standard and pH value with pH value.It should be noted that, when in the present invention, various compositions are used with its solution form, its consumption is in effective constituent wherein, as while using the sodium polyacrylate of above-mentioned chemical industry standard, the consumption of sodium polyacrylate calculates with its solid content or solids component.
At above-mentioned binary displacement oil provided by the invention, use in oil-displacing agent, preferably, the dispersion agent adopting comprises ATMP (Amino Trimethylene Phosphonic Acid, active ingredient 35-40%), TH3100 (carboxylate salt-sulfonate-nonionic terpolymer, solid content 43%) one or more and in TH904 (main component is anionic polymer, and solid content is more than 40%) etc.Above-mentioned dispersion agent is the production of Shandong calm and peaceful water treatment company limited.
At above-mentioned binary displacement oil provided by the invention, with in oil-displacing agent, preferably, the assistant agent adopting is polyoxyethylenesorbitan sorbitan monooleate and/or alkyl polysaccharide acid anhydride etc.Wherein, polyoxyethylenesorbitan sorbitan monooleate can, for any polyoxyethylenesorbitan sorbitan monooleate with emulsifying effect well known by persons skilled in the art, all can be realized the object of the invention; Preferably, above-mentioned polyoxyethylenesorbitan sorbitan monooleate is that acid number≤2.0mgKOH/g, saponification value are that 45-55mgKOH/g, hydroxyl value are the polyoxyethylenesorbitan sorbitan monooleate that 65-80mg KOH/g, oxyethylene group are 65-69.5wt%, and its effect is relatively better.Abovementioned alkyl polysaccharide glycosides (such as APG0810, APG0814, APG1214, APG0812) can, for any nonionogenic tenside that is widely used in the fields such as washing composition, makeup, food and medicine well known by persons skilled in the art, all can be realized object of the present invention; Preferably, abovementioned alkyl polysaccharide glycosides is that active matter content 50%, the sugared polymerization degree are 1.4-1.6, residual alcohol lower than 1%, HLB value for 12-14, alkyl carbon number be that 8-16, pH value are the alkyl polysaccharide acid anhydride of 11-12, its effect is relatively better.
At above-mentioned binary displacement oil provided by the invention, with in oil-displacing agent, preferably, the water adopting can be clear water, can be also the stratum Simulated Water of target oil field block, wherein mainly contains Ca
2+, Mg
2+, Na
+, K
+, Cl
-, HCO
3 -, CO
3 2-, SO
4 2-plasma, each component content is determined according to the practical situation in each oil field.
Binary displacement oil provided by the invention is environmentally friendly, pollution-free with oil-displacing agent, to stratum without injury, and the raw material adopting is simple and easy to get, has a large amount of industrial goods.Under hypotonic condition, adopt binary displacement oil provided by the invention can make oil-sand de-oiling rate reach average more than 70% with oil-displacing agent, core normal pressure static state average de-oiling rate reaches more than 25%, and chemical flooding recovery ratio average out to is more than 20%.This oil-displacing agent can be used for the displacement of reservoir oil of low-permeability oil deposit, can directly use existing water injection equipment to realize and inject, and does not need large-scale support equipment.Binary displacement oil provided by the invention is simple and easy to get with the raw material of oil-displacing agent, consumption is few, has especially higher recovery ratio under hypotonic condition.
Above-mentioned binary displacement oil provided by the invention with oil-displacing agent in the preparation host, assistant agent, dispersion agent etc. are added to the water mix available.
The present invention also provides a kind of oil field binary displacement oil reoovery method, it comprises the step that above-mentioned binary displacement oil is carried out to displacement of reservoir oil operation with oil-displacing agent injection oil well, wherein, before carrying out displacement of reservoir oil operation, first adopting salinity conditioning agent described binary displacement oil to be adjusted into the value of target reservoir by the salinity of oil-displacing agent, can be generally 3000-30000mg/L.The salinity conditioning agent adopting when regulating mineralization degree of injected oil can be salt solution, stratum Simulated Water etc.
In above-mentioned reoovery method provided by the invention, preferably, binary displacement oil may be controlled to 0.2-0.3PV by the injection rate of oil-displacing agent.
In above-mentioned reoovery method provided by the invention, preferably, the front and back that the method is also included in displacement of reservoir oil operation are respectively to the step of injection of polymer slug in oil well, and the injection rate of polymer slug is respectively 0.1-0.2PV.According to specific embodiment of the invention scheme, preferably, above-mentioned polymer slug is the aqueous solution of anionic partially hydrolyzed polyacrylamide (HPAM), and its concentration is 1000-2000mg/L; More preferably, the molecular-weight average of above-mentioned anionic partially hydrolyzed polyacrylamide is 1600-2000 ten thousand, and degree of hydrolysis is 30%, and solid content (active constituent content) is more than 80%.
Feature of the present invention is take that oil displacement efficiency is as main criterion, and the interfacial tension of not take is ultralow is standard, and the water-soluble and visco-elasticity that mainly relies on host can form homogeneous, clear solution, increase permeability and involve ability.Binary displacement oil provided by the invention utilizes the interfacial activity of host to reach the effect of wash-out irreducible oil with oil-displacing agent, utilizes appropriate emulsification, the dissemination of assistant agent further to strengthen to drive and washes function and involve function.
Oil displacement efficiency of the present invention represents by the value of chemical flooding recovery ratio and de-oiling rate, chemical flooding recovery ratio=(displacing the quality that contains crude oil in oily quality/core) * 100%, de-oiling rate=(deviating from the quality of original oil in oily quality/oil-sand or core) * 100%.
Binary displacement oil provided by the invention has the following advantages with oil-displacing agent:
(1), by adopting the industrial water conditioner widely using as host, the displacement of reservoir oil when adopting, washing oil successful, overcome highly basic and had the problems such as the formation damage that causes and fouling, burn into Produced Liquid difficult treatment;
(2) adopt environment-friendly type tensio-active agent as assistant agent, effective with host combined action, composing system species is few, and preparation is convenient, does not need to add large-scale dosing equipment, has reduced running cost;
(3) oil-displacing agent solvability is good, can be mixed into uniform solution with water, without harmful side product, generates, environmentally friendly, easily degraded, adsorb lower, oil-displacing agent utilization ratio is higher;
(4) in this oil-displacing agent, do not contain NaOH, Na
2cO
3, NaHCO
3deng alkaline matter.
Embodiment
For technical characterictic of the present invention, object and beneficial effect being had more clearly, understand, existing technical scheme of the present invention is carried out to following detailed description, but can not be interpreted as restriction that can practical range of the present invention.
In following examples, the core adopting is natural exposure core and natural shellfish thunder core, crude oil is Dagang Oilfield crude oil and Daqing oil field crude oil, stratum Simulated Water is respectively Dagang Oilfield water and Daqing oil water in field, the salinity of Dagang Oilfield water is that 8768mg/L, the former oil viscosity of Dagang Oilfield are 9.9mPas (53.6 ℃), and the salinity of Daqing oil water in field is that 5679mg/L, the former oil viscosity of Daqing oil field are 10.0mPas (45 ℃);
Sodium polyacrylate is produced by Huantai County, Shandong Province company of Jin Long Chemical Co., Ltd., and the trade mark is PAAS, and its solid content is 30-50 % by weight, and free monomer is (with CH
2=CH-COOH meter) content is 0.5-1 % by weight, and pH value is 6-8;
Polyoxyethylenesorbitan sorbitan monooleate is produced by Shanghai Bing Qi Chemical Industry Science Co., Ltd, and the trade mark is Tween 80, acid number≤2.0mgKOH/g, and saponification value is 45-55mgKOH/g, and hydroxyl value is 65-80mgKOH/g, and oxyethylene group content is 65-69.5 % by weight;
Alkyl polysaccharide acid anhydride effluent north Hebei Shijiazhuang Jinmoer Huaxuepin Youxian Goingsi produces, the trade mark is APG0814, solid content is 70 % by weight, low-carbon (LC) Glycosides Contents≤0.5 % by weight, HLB value is 14-16, inorganic salt content≤4.0 % by weight, viscosity (20 ℃)>=5000mPas, density 1.05-1.15g/cm
3, pH is 11.5-12.5.
Polyacrylamide is the anion-polyacrylamide for oil field (HPAM) that Beijing permanent dimerization work Group Co.,Ltd produces, and working substance content is 88 % by weight, and molecular-weight average is 1600-2000 ten thousand.
Natural exposure core: Beijing Hao Saida Science and Technology Ltd. produces, diameter 2.5cm or 3.8cm, length is respectively 20cm and 30cm;
Natural shellfish thunder core: by LDL Development Co., Ltd of Beijing Skyworth from imported from America, diameter 2.5cm or 3.8cm, length is respectively 20cm and 30cm;
TH3100 (carboxylate salt-sulfonate-nonionic terpolymer, solid content 43%), (main component is anionic polymer to TH904, solid content is more than 40%), ATMP (Amino Trimethylene Phosphonic Acid potassium, active ingredient 35-40%) is Shandong calm and peaceful water treatment company limited and produces.
Other reagent are all from being purchased.
Embodiment 1
The present embodiment provides a kind of binary displacement oil oil-displacing agent, and it is prepared by following steps:
By 0.3g sodium polyacrylate, 0.08g polyoxyethylenesorbitan sorbitan monooleate, micro-dispersion agent (ATMP, 0.001g) by appropriate Daqing oil field water dissolution, obtain solution, the salinity of the NaCl aqueous solution regulator solution that is 20wt% by concentration, with Daqing oil water in field, being diluted to gross weight is again 100g, obtains four kinds of oil-displacing agent solution that salinity is respectively 5630mg/L, 10630mg/L, 15630mg/L, 25630mg/L.
Oil-sand de-oiling experiment:
While adopting 45 ℃, viscosity is 10mPas, d=0.8294g/cm
3oil-sand (the 40-80 order prepared of Daqing oil field crude oil, the concrete preparation process of oil-sand: the mass ratio by the mass ratio of quartz sand and crude oil according to 8: 2 mixes, then put into baking oven at 45 ℃ of formation temperature aging 192 hours, stand-by) above-mentioned four kinds of oil-displacing agent solution are carried out respectively to the static de-oiling experiment of normal pressure, and (the aging good oil-sand that takes 15g left and right is put into de-oiling bottle, (reaching groove can conveniently measure to a certain scale value after compacting, to inject the oil-displacing agent aqueous solution, do not need accurately, general to 0.5-1.0mL place), then put into thermostat container, the volume cost that time recording is fuel-displaced, can calculate de-oiling rate), this experiment adopts normal pressure de-oiling bottle to carry out (" a kind of Self-imbibition instrument " that for example ZL201120075849.7 provides, it is introduced here as a reference in full) result of the static de-oiling experiment of normal pressure shows that 24 hours de-oiling rates of above-mentioned four kinds of oil-displacing agent solution are 100%.
Embodiment 2
The present embodiment provides a kind of binary displacement oil oil-displacing agent, and it is prepared by following steps:
By 0.3g sodium polyacrylate, 0.05g polyoxyethylenesorbitan sorbitan monooleate, micro-dispersion agent (TH904,0.002g) by appropriate Daqing oil field water dissolution, obtain solution, the salinity of the NaCl aqueous solution regulator solution that is 20wt% by concentration, with Daqing oil water in field, being diluted to gross weight is again 100g, obtains four kinds of oil-displacing agent solution that salinity is respectively 5200mg/L, 10200mg/L, 15200mg/L, 25200mg/L.
Oil-sand de-oiling experiment:
While adopting 45 ℃, viscosity is 10mPas, d=0.8294g/cm
3oil-sand (the 80-100 order prepared of Daqing oil field crude oil, 45 ℃ are aging 192 hours) above-mentioned four kinds of oil-displacing agent solution are carried out respectively to the static de-oiling experiment of normal pressure, this experiment adopts normal pressure de-oiling bottle to carry out (" a kind of Self-imbibition instrument " that for example ZL201120075849.7 provides, it is introduced here as a reference in full), concrete operations are with embodiment 1.
The result of the static de-oiling experiment of normal pressure shows that 24 hours de-oiling rates of above-mentioned four kinds of oil-displacing agent solution are respectively 67.37%, 67.91%, 79.55%, 80.08%, average out to 73.73%.
Embodiment 3
The present embodiment provides a kind of binary displacement oil oil-displacing agent, and it is prepared by following steps:
By 0.3g sodium polyacrylate, 0.05g polyoxyethylenesorbitan sorbitan monooleate, micro-dispersion agent (TH904,0.002g) by appropriate Dagang Oilfield water dissolution, obtain solution, the salinity of the NaCl aqueous solution regulator solution that is 20wt% by concentration, with Dagang Oilfield water, being diluted to gross weight is again 100g, obtains four kinds of oil-displacing agent solution that salinity is respectively 8700mg/L, 13700mg/L, 18700mg/L, 28700mg/L.
Oil-sand de-oiling experiment:
While adopting 53.6 ℃, viscosity is 9.9mPas, d=0.8603g/cm
3oil-sand (the 100-160 order prepared of Dagang Oilfield crude oil, 53.6 ℃ are aging 192 hours) above-mentioned four kinds of oil-displacing agent solution are carried out respectively to the static de-oiling experiment of normal pressure, this experiment adopts normal pressure de-oiling bottle to carry out (" a kind of Self-imbibition instrument " that for example ZL201120075849.7 provides, it is introduced here as a reference in full), concrete operations are with embodiment 1.The result of the static de-oiling experiment of normal pressure shows that 24 hours de-oiling rates of above-mentioned four kinds of oil-displacing agent solution are respectively 86.99%, 80.37%, 99.74%, 98.41%, de-oiling rate average out to 91.38%.
Embodiment 4
The present embodiment provides a kind of binary displacement oil oil-displacing agent, and it is prepared by following steps:
By 0.3g sodium polyacrylate, 0.05g polyoxyethylenesorbitan sorbitan monooleate, micro-dispersion agent (TH3100,0.001g) by appropriate Dagang Oilfield water dissolution, obtain solution, the salinity of the NaCl aqueous solution regulator solution that is 20wt% by concentration, with Dagang Oilfield water, being diluted to gross weight is again 100g, and obtaining salinity is the oil-displacing agent solution of 18700mg/L.
Oil-sand de-oiling experiment:
While adopting 53.6 ℃, viscosity is 9.9mPas, d=0.8603g/cm
3dagang Oilfield crude oil prepare the oil-sand (40-80 order/53.6 ℃ aging 72hr of three kinds of particle diameters, 80-100 order/53.6 ℃ aging 144hr, 100-160 order/53.6 ℃ aging 172hr) above-mentioned oil-displacing agent solution is carried out respectively to the static de-oiling experiment of normal pressure, this experiment adopts normal pressure de-oiling bottle to carry out (" a kind of Self-imbibition instrument " that for example ZL201120075849.7 provides, it is introduced here as a reference in full), concrete operations are with embodiment 1.The result of the static de-oiling experiment of normal pressure shows that above-mentioned oil-displacing agent solution is respectively 92.72%, 89.26%, 78.76% to 24 of three kinds of oil-sands hours de-oiling rates, de-oiling rate average out to 86.91%.
Embodiment 5
The present embodiment provides a kind of binary displacement oil oil-displacing agent, and it is prepared by following steps:
By 0.3g sodium polyacrylate, 0.05g alkyl polysaccharide acid anhydride (APG0814), micro-dispersion agent (TH904,0.001g) by appropriate Dagang Oilfield water dissolution, obtain solution, the salinity of the NaCl aqueous solution regulator solution that is 20wt% by concentration, with Dagang Oilfield water, being diluted to gross weight is again 100g, obtains four kinds of oil-displacing agent solution that salinity is respectively 14029mg/L, 19029mg/L, 24029mg/L, 29029mg/L.
Oil-sand de-oiling experiment:
While adopting 53.6 ℃, viscosity is 9.9mPas, d=0.8603g/cm
3oil-sand (the 40-80 order prepared of Dagang Oilfield crude oil, 53.6 ℃ are aging 72 hours) above-mentioned four kinds of oil-displacing agent solution are carried out respectively to the static de-oiling experiment of normal pressure, this experiment adopts normal pressure de-oiling bottle to carry out (" a kind of Self-imbibition instrument " that for example ZL201120075849.7 provides, it is introduced here as a reference in full), concrete operations are with embodiment 1.
The result of the static de-oiling experiment of normal pressure shows that 24 hours de-oiling rates of above-mentioned four kinds of oil-displacing agent solution are respectively 84.43%, 86.09%, 90.78%, 82.50%, de-oiling rate average out to 85.95%.
Embodiment 6
The present embodiment provides a kind of binary displacement oil oil-displacing agent, and it is prepared by following steps:
By 0.3g sodium polyacrylate, 0.05g alkyl polysaccharide acid anhydride (APG0814), micro-dispersion agent (TH3100,0.001g) by appropriate Dagang Oilfield water dissolution, obtain solution, the salinity of the NaCl aqueous solution regulator solution that is 20wt% by concentration, with Dagang Oilfield water, being diluted to gross weight is again 100g, and obtaining salinity is the oil-displacing agent solution of 13700mg/L.
Core de-oiling experiment:
While adopting 53.6 ℃, viscosity is 9.9mPas, the saturated natural exposure core of Dagang Oilfield crude oil of d=0.8603g/cm3, (concrete steps are: after the natural exposure core of saturation oil is taken out from rock core fastener, put into rapidly on the support of de-oiling bottle to adopt above-mentioned oil-displacing agent solution to carry out the static de-oiling experiment of 4 groups of normal pressures, inject immediately oil-displacing agent solution to a certain value of de-oiling bottle high scale pipe, then putting into thermostat container is incubated, time recording is deviate from oily amount, de-oiling amount when reaching balance can calculate de-oiling rate), this experiment adopts normal pressure de-oiling bottle to carry out (" a kind of Self-imbibition instrument " that for example ZL201120075849.7 provides, it is introduced here as a reference in full).The experimental result of the static de-oiling of this normal pressure and final de-oiling rate are as shown in table 1, and average de-oiling rate is 26.82%.The de-oiling rate is here to calculate according to the time that reaches imbibition balance (starting time), is generally 3-10 days.
Table 1
Embodiment 7
The present embodiment provides a kind of binary displacement oil oil-displacing agent, and it is prepared by following steps:
By 0.3g sodium polyacrylate, 0.05g polyoxyethylenesorbitan sorbitan monooleate, micro-dispersion agent (ATMP, 0.002g) by appropriate Dagang Oilfield water dissolution, obtain solution, the salinity of the NaCl aqueous solution regulator solution that is 20wt% by concentration, with Dagang Oilfield water, being diluted to gross weight is again 100g, and obtaining salinity is the oil-displacing agent solution of 28700mg/L.
Core de-oiling experiment:
While adopting 53.6 ℃, viscosity is 9.9mPas, d=0.8603g/cm
3the Dagang Oilfield crude oil saturated permeability import shellfish thunder core that is 96.9mD, adopt above-mentioned oil-displacing agent solution to carry out the static de-oiling experiment of normal pressure, this experiment adopts normal pressure de-oiling bottle to carry out (" a kind of Self-imbibition instrument " that for example ZL201120075849.7 provides, introduces here as a reference in full).
The static de-oiling experimental result of normal pressure shows that the normal pressure de-oiling rate of above-mentioned oil-displacing agent solution is 20.83%, and the time that reaches imbibition balance is 20 days.
Embodiment 8
The present embodiment provides a kind of binary displacement oil oil-displacing agent, and it is prepared by following steps:
By 0.3g sodium polyacrylate, 0.05g polyoxyethylenesorbitan sorbitan monooleate, micro-dispersion agent (TH904,0.003g) by appropriate Dagang Oilfield water dissolution, obtain solution, the salinity of the NaCl aqueous solution regulator solution that is 20wt% by concentration, with Dagang Oilfield water, being diluted to gross weight is again 100g, and obtaining salinity is the oil-displacing agent solution of 28700mg/L.
Core de-oiling experiment:
While adopting 53.6 ℃, viscosity is 9.9mPas, d=0.8603g/cm
3dagang Oilfield crude oil saturated permeability be respectively 22mD and 30mD import shellfish thunder core, adopt above-mentioned oil-displacing agent solution to carry out the static de-oiling experiment of normal pressure, this experiment adopts normal pressure de-oiling bottle to carry out (" a kind of Self-imbibition instrument " that for example ZL201120075849.7 provides, introduces here as a reference in full).
The static de-oiling experimental result of normal pressure shows that above-mentioned oil-displacing agent solution is respectively 43.08% and 25.23% to 3 of two kinds of cores days normal pressure de-oiling rates, and average de-oiling rate is 34.16%.
Embodiment 9
The present embodiment provides a kind of binary displacement oil oil-displacing agent, and it is prepared by following steps:
By 0.05g sodium polyacrylate, 0.05g alkyl polysaccharide acid anhydride (APG0814), trace dispersion agent (ATMP, 0.002g) by appropriate Dagang Oilfield water dissolution, obtain solution, the salinity of the NaCl aqueous solution regulator solution that is 20wt% by concentration, with Dagang Oilfield water, being diluted to gross weight is again 100g, and obtaining salinity is the oil-displacing agent solution of 13700mg/L.
Core de-oiling experiment:
While adopting 53.6 ℃, viscosity is 9.9mPas, d=0.8603g/cm
3dagang Oilfield crude oil saturated permeability be respectively 122mD and 379mD natural exposure core, adopt above-mentioned oil-displacing agent solution to carry out the static de-oiling experiment of normal pressure, this experiment adopts normal pressure de-oiling bottle to carry out (" a kind of Self-imbibition instrument " that for example ZL201120075849.7 provides, introduces here as a reference in full).
The static de-oiling experimental result of normal pressure shows that above-mentioned oil-displacing agent solution is respectively 29.88% and 23.66% to 16 of two kinds of cores days de-oiling rates, and average de-oiling rate is 26.77%.
Embodiment 10
The present embodiment provides a kind of binary displacement oil oil-displacing agent, and it is prepared by following steps:
By 0.05g sodium polyacrylate, 0.04g alkyl polysaccharide acid anhydride (APG0814), micro-dispersion agent (TH904,0.003g) by appropriate Dagang Oilfield water dissolution, obtain solution, the salinity of the NaCl aqueous solution regulator solution that is 20wt% by concentration, with Dagang Oilfield water, being diluted to gross weight is again 100g, and obtaining salinity is the oil-displacing agent solution of 13700mg/L.
Chemical flooding oil displacement experiment:
While adopting 53.6 ℃, viscosity is 9.9mPas, d=0.8603g/cm
3dagang Oilfield crude oil saturated permeability be respectively the import shellfish thunder core of 86.5mD and 186mD, adopt above-mentioned oil-displacing agent solution to carry out oil displacement experiment under reservoir pressure, concrete operations are with reference to SY/T6424-2000 " composite oil-displacing system performance test methods ", wherein, oil-displacing agent injection rate is 0.3PV, till the displacement of reservoir oil to the water ratio of liquid effluent reaches 98v%.
Experimental result demonstration, waterflood recovery efficiency factor is that the 37.0% and 37.5% upper chemical flooding recovery ratio in basis is respectively 24.90% and 21.41%, chemical flooding average recovery ratio is 23.16%.
Embodiment 11
The present embodiment provides a kind of binary displacement oil oil-displacing agent, and it is prepared by following steps:
By 0.3g sodium polyacrylate, 0.05g polyoxyethylenesorbitan sorbitan monooleate, micro-dispersion agent (TH904,0.001g) by appropriate Dagang Oilfield water dissolution, obtain solution, the salinity of the NaCl aqueous solution regulator solution that is 20wt% by concentration, with Dagang Oilfield water, being diluted to gross weight is again 100g, and obtaining salinity is the oil-displacing agent solution of 18700mg/L.
Chemical flooding oil displacement experiment:
While adopting 53.6 ℃, viscosity is 9.9mPas, d=0.8603g/cm
3dagang Oilfield crude oil saturated permeability be respectively 237mD and 334mD import shellfish thunder core, adopt above-mentioned oil-displacing agent solution to carry out oil displacement experiment under reservoir pressure; concrete operations ginseng is by SY/T6424-2000 " composite oil-displacing system performance test methods "; wherein; oil-displacing agent injection rate is 0.2PV, using 1000mg/L (0.1PV) polyacrylamide as protection slug.Carry out two cycles the result of (carrying out continuous chemical flooding process 2 times), waterflood recovery efficiency factor is that the 41.0% and 45.79% upper chemical flooding recovery ratio in basis is respectively 22.18% and 38.79%, and chemical flooding average recovery ratio is 30.49%.
Embodiment 12
The present embodiment provides a kind of binary displacement oil oil-displacing agent, and it is prepared by following steps:
By 0.3g sodium polyacrylate, 0.05g polyoxyethylenesorbitan sorbitan monooleate, micro-dispersion agent (TH3100,0.001g) by appropriate Dagang Oilfield water dissolution, obtain solution, the salinity of the NaCl aqueous solution regulator solution that is 20wt% by concentration, with Dagang Oilfield water, being diluted to gross weight is again 100g, and obtaining salinity is the oil-displacing agent solution of 18700mg/L.
Chemical flooding oil displacement experiment:
While adopting 53.6 ℃, viscosity is 9.9mPas, d=0.8603g/cm
3dagang Oilfield crude oil saturated permeability be respectively 100mD and 95.9mD import shellfish thunder core, adopt above-mentioned oil-displacing agent solution to carry out oil displacement experiment; concrete operations are with reference to SY/T6424-2000 " composite oil-displacing system performance test methods "; wherein; ring is pressed as 2MPa; oil-displacing agent injection rate is 0.3PV, and front and back respectively add the polyacrylamide (1000mg/L) of 0.2PV as protection slug.Result shows, at waterflood recovery efficiency factor, is that on 33.1% and 34.5% basis, chemical flooding recovery ratio is respectively 20.5% and 28.9%, chemical flooding recovery ratio average out to 24.7%.
From the result of embodiment 1-5, can find out, the static de-oiling rate average out to 87.57% of oil-displacing agent provided by the invention to the oil-sand that adopts Dagang Oilfield crude oil and Daqing oil field crude oil and make, from the result of embodiment 6-9, can find out, oil-displacing agent provided by the invention is the de-oiling rate average out to 27.14% to natural shellfish thunder core and the core of appearing under normal pressure, demonstrates very strong de-oiling effect; From embodiment 10-12 result, can find out, for Low-permeable Cores chemical flooding recovery ratio average out to 26.12%, chemical flooding recovery ratio is high, and all has good effect in the region of salinity a wider range (3000-30000mg/L), obvious better than prior art.
By above test, can find out, oil-displacing agent provided by the invention has significantly improved the recovery ratio of LOW PERMEABILITY RESERVOIR, and the composition of this oil-displacing agent is simple, cost is suitable.
Claims (11)
1. a binary displacement oil oil-displacing agent, by weight percentage, this binary displacement oil comprises with oil-displacing agent: the dispersion agent of the host of 0.05-0.4%, the assistant agent of 0.01-0.2%, 0.001-0.005%, surplus is water; Wherein, the polymkeric substance that described host is acrylate, described assistant agent is one or more the combination in polyoxyethylene sorbitol anhydride of organic acid ester and alkyl polysaccharide acid anhydride.
2. binary displacement oil oil-displacing agent according to claim 1, wherein, described polyoxyethylene sorbitol anhydride of organic acid ester is polyoxyethylene sorbitol acid anhydride carboxylicesters.
3. binary displacement oil oil-displacing agent according to claim 1 and 2, wherein, the mass ratio of described host and described assistant agent is 2-40:1.
4. binary displacement oil oil-displacing agent according to claim 1 and 2, wherein, the polymkeric substance of described acrylate comprises one or more the combination in polyacrylic acid potassium, sodium polyacrylate, sodium polymethacrylate and ammonium polyacrylate.
5. binary displacement oil oil-displacing agent according to claim 1 and 2, wherein, described dispersion agent comprises one or more in ATMP, TH3100 and TH904.
6. binary displacement oil oil-displacing agent according to claim 1 and 2, wherein, described assistant agent is polyoxyethylenesorbitan sorbitan monooleate and/or alkyl polysaccharide acid anhydride.
7. an oil field binary displacement oil reoovery method, it comprises the step that the binary displacement oil described in claim 1-6 any one is carried out to displacement of reservoir oil operation with oil-displacing agent injection oil well, wherein, before carrying out displacement of reservoir oil operation, first adopt salinity conditioning agent that described binary displacement oil is adjusted into 3000-30000mg/L by the salinity of oil-displacing agent.
8. method according to claim 7, wherein, described binary displacement oil is 0.2-0.3PV by the injection rate of oil-displacing agent.
9. according to the method described in claim 7 or 8, wherein, the front and back that the method is also included in displacement of reservoir oil operation are respectively to the step of injection of polymer slug in oil well, and the injection rate of described polymer slug is respectively 0.1-0.2PV.
10. method according to claim 9, wherein, described polymer slug is the aqueous solution of anionic partially hydrolyzed polyacrylamide, its concentration is 1000-2000mg/L.
11. methods according to claim 10, wherein, the molecular-weight average of described anionic partially hydrolyzed polyacrylamide is 1600-2000 ten thousand, and degree of hydrolysis is 30%, and solid content is more than 80%.
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| CN1152587A (en) * | 1995-12-20 | 1997-06-25 | 四川联合大学 | Method for preparation of polymer oil-displacing agent |
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