CN100564477C - Be used for improving flooding system of recovery ratio and preparation method thereof behind the polymer flooding - Google Patents
Be used for improving flooding system of recovery ratio and preparation method thereof behind the polymer flooding Download PDFInfo
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- CN100564477C CN100564477C CNB2008100157892A CN200810015789A CN100564477C CN 100564477 C CN100564477 C CN 100564477C CN B2008100157892 A CNB2008100157892 A CN B2008100157892A CN 200810015789 A CN200810015789 A CN 200810015789A CN 100564477 C CN100564477 C CN 100564477C
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Abstract
The present invention relates to a kind of flooding system of improving behind the polymer flooding recovery ratio and preparation method thereof that is used for, belong to oil field intensified oil reduction technical field.Flooding system of the present invention is to utilize lotus opposite charges tensio-active agent and interpolymer interaction to form to have the high reactivity mixture, and is equipped with nonionogenic tenside and obtains novel flooding system.It has solved problems such as existing flooding system temperature resistance and anti-inorganic high-valence cationic poor performance.System of the present invention has than advantages such as high viscosity, ultra low interfacial tension and low dosages, is with a wide range of applications in the oil field of implementing raising oil recovery factor technology.
Description
Technical field
The present invention relates to a kind of novel flooding system of further improving behind the polymer flooding recovery ratio and preparation method thereof that is used for, belong to oil field intensified oil reduction technical field.
Background technology
Along with constantly carrying out of oil production, the oil field of many regions has all entered the high water-cut stage of development late stage in the world.Present stage can be improved the recovery ratio of maturing field effectively, and the flooding method that increase can be adopted content has: caustic waterflooding, polymer flooding, surfactant flooding (active water drive, micella drive with microemulsion and drive) and ternary composite driving (alkali-polymkeric substance-tensio-active agent).Wherein, ternary composite driving is to develop on the basis of caustic waterflooding and polymer flooding, be characterized in that cost is low and can significantly improve oil recovery factor, but wherein contained a large amount of alkali all bring huge injury to stratum and oil well, are unfavorable for the sustainable development in oil field.
In order to address the above problem, from the angle of protection hydrocarbon zone, the surfactant and polymer binary combination flooding has a good application prospect.It is the flooding system that utilizes polymkeric substance and surfactant compound to form.At present, polymkeric substance such as hydro-polyacrylamide commonly used utilize its high visco-elasticity to improve sweep efficiency as mobility control agent, improve oil/water mobility ratio, reduce the absorption loss of oil-displacing agent on formation rock; And reduce interfacial tension between crude oil and the water with tensio-active agent, enable emulsification better and solubilising crude oil, thereby improve the displacement efficiency of displacing fluid.The tensio-active agent that uses mainly is anion surfactants such as sulfonated petro-leum, alkylbenzene sulfonate and sodium lignosulfonate at present.This type of tensio-active agent has and reduces oil/water termination tensile ability preferably, but the existence of inorganic high-valence cationic can cause its precipitation, thereby influences its performance.Especially for the oil reservoir behind the process polymer flooding, not only formation temperature constantly raises, and the water-mineralizing degree is also more and more high, and the viscosity and the interfacial tension of traditional anionic polymers compound system all are difficult to reach requirement.Guarantee that flooding system has sufficiently high viscosity and ultra low interfacial tension simultaneously under high salinity and higher temperature conditions, must break through the circle of in the past utilizing the anionic polymers compound system.
Summary of the invention
In order to solve problems such as high temperature resistance that prior art exists and anti-inorganic high-valence cationic poor performance and consumption are big, the invention provides a kind of novel flooding system of further improving behind the polymer flooding recovery ratio and preparation method thereof that is used for, this flooding system is to reach the intensified oil reduction combination flooding agent that has low dosage characteristics again than high viscosity and ultra low interfacial tension.
Technical scheme of the present invention is as follows:
Be used for improving behind the polymer flooding flooding system of recovery ratio, consisting of by mass percentage:
Cats product 0.01-0.2%
Anionic water-soluble polymer weight polymers 0.1-0.2%
Nonionogenic tenside 0.01-0.2%
Additive 0-1.5%
Water surplus.
In above-mentioned oil-displacing agent system, the interaction of regulation and control cats product and anionic polyelectrolyte, make it to form mixture with high interfacial activity, and with the solubility of nonionogenic tenside regulation system, and then make good stability, reduce the strong and high oil-displacing agent of system viscosity of oil water interfacial tension ability.
Described cats product is a quaternary, specifically is selected from the dimer of dimer, alkyl imidazole or the alkyl imidazole of cetyl trimethylammonium bromide (CTAB) or cetyl trimethylammonium bromide dimer, alkyl trimethyl pyridinium bromide or alkyl trimethyl pyridinium bromide, in the double hexadecyl dimethyl brometo de amonio one or more.
Described anionic water-soluble polymer weight polymers is a hydro-polyacrylamide, the perhaps combination of hydro-polyacrylamide and xanthan gum, described hydro-polyacrylamide molecular weight 1,400 ten thousand-2,000 ten thousand, degree of hydrolysis 20-40%.
Described nonionogenic tenside is one or more in oligomer, fatty alcohol-polyoxyethylene ether or the aliphatic acid polyethenoxy ether of polyoxyethylene nonylphenol ether, Triton X-100, iso-octyl phenolic group Soxylat A 25-7 (Triton X-100), Triton X-100.
The oligomer of described Triton X-100 comprises dimer, tripolymer or heptamer Tyloxapol (isooctyl phenol formaldehyde resin Soxylat A 25-7).
Described additive is inorganic salt, the preferred sodium-chlor of described inorganic salt, Repone K, sodium iodide, calcium chloride, magnesium chloride or sodium sulfate etc.The situation of local water during according to application, if local water contains above-mentioned inorganic salt, then this additive can not add.
The preparation method of the flooding system that the present invention is above-mentioned, step is as follows:
Anionic water-soluble polymer weight polymers, cats product, nonionogenic tenside, additive and water (perhaps containing the inorganic salt local water) are joined in the mixing tank that has whipping appts in proportion, at room temperature stirred 1-2 hour, promptly.
The above-mentioned flooding system viscosity 〉=10mPas of the present invention (cuts speed and is 7S
-1) flooding system.
The present inventor at length studied hydro-polyacrylamide (HPAM) and cats product and nonionogenic tenside compound system rheological and and crude oil between interfacial tension, investigated the influence of composition, temperature and the salinity etc. of compound system to compound system character.The HPAM that considers the bear electricity is remarkable to the compound system performance impact, has at length investigated the influence of HPAM concentration to the interfacial tension of system and crude oil, with HPAM concentration to 10000mgL
-1(calcium ions and magnesium ions content is 440mgL to mineralized water
-1) middle Triton X-100: CTAB=3: the influence of 1 (mass ratio) system interfacial tension is an example, the results are shown in the accompanying drawing 1.Obviously, appropriate amount HPAM has an interfacial tension that is beneficial between reduction system and crude oil, and when having only concentration to acquire a certain degree, interfacial tension can be reduced to ultra low levels.
For the solubility of regulation system, select nonionogenic tenside and cats product compound system.Cats product (CTAB) concentration influences rule as shown in Figure 2 to system and crude oil ultra low interfacial tension, the adding of CTAB is to the highly significant that influences of system interfacial tension, and when the concentration of CTAB was 0.01wt%, interfacial tension also can reach ultralow in the short period of time.
Simultaneously, we have also investigated the influence of salinity to the compound system ultra low interfacial tension, as shown in Figure 3, and when salinity is 2000 and 4000mgL
-1The time, the interfacial tension of system and crude oil reaches equilibrium value very soon, but interfacial tension is higher, is higher than 6000mgL and work as salinity
-1The time, interfacial tension can reach ultra low levels.
We have also investigated xanthan gum as additive and change the influence of tensio-active agent to the system interfacial tension in addition, as shown in Figure 4, adding xanthan gum (XC) in compound system still can make interfacial tension reach ultralow, and change the cats product cetyl trimethylammonium bromide (CTAB) in the compound system into hexadecyl pyridinium bromide (CPB), also can reach ultra low interfacial tension.We also keep in the compound system condition such as HPAM and CTAB and salinity constant in addition, Triton X-100 is replaced to Triton X-100 oligomer Tyloxapol, and investigated the influence of Tyloxapol and CTAB different mass comparison interfacial tension, as shown in Figure 5, when Tyloxapol and CTAB mass ratio were 1: 1,3: 1,5: 1, it is ultralow that the interfacial tension of compound system and crude oil can reach.
By discovering, the adding of tensio-active agent has bigger influence to the viscosity of system, and we are at 0.17%HPAM, 0.1% tensio-active agent and 10000mgL
-1(calcium ions and magnesium ions content is 440mgL to mineralized water
-1) compound system studied the different influences to system viscosity with the cats product proportioning of nonionogenic tenside, as shown in Figure 6, nonionogenic tenside and cats product proportioning change remarkable to the viscosity influence of system, when the mass ratio of nonionogenic tenside and cats product was 1: 1 and 3: 1, system was 7s in shearing rate
-1The time viscosity can be greater than 10mPas.
The novel flooding system that is used for further improving behind the polymer flooding recovery ratio of the present invention has following advantage:
1. flooding system adopts is the polymkeric substance and the tensio-active agent of suitability for industrialized production, and raw material is easy to get, and the consumption of polymkeric substance and tensio-active agent is few, and cost is relatively low;
2. experimental results show that, the polyelectrolyte of cats product and bear electricity interacts can produce the mixture with high interfacial activity, help reaching ultra low interfacial tension, and, cats product and nonionogenic tenside produce synergistic effect, both help interfacial tension lowering, also helped the body formation of middle aggregate mutually, thus the unification that realizes reducing interfacial tension and improve the system viscosity;
3. the combination flooding prescription need not add alkali and can reach ultra low interfacial tension, has overcome alkali to the infringement on stratum and to the problems such as reduction of polymer viscosity;
4. combination flooding prescription high temperature resistance, anticalcium magnesium ability are strong, the experiment proved that composite displacement system can be at 70 ℃ and 10000mgL
-1Under the salinity, viscosity reaches 10mPas, and interfacial tension can reach ultralow simultaneously;
5. prove through lab simulation core oil displacement experiment that this composite oil-displacing system is used for can making oil displacement efficiency improve 8.6% behind the polymer flooding;
6. the combination flooding prescription can be with the preparation of Gudao area of Shengli Oilfield oil recovery factory local water, can the conserve water resource, and have environmental benefit, and prove by adsorption experiment, tensio-active agent still can make interfacial tension reach ultralow after quartz sand surface absorption.
Description of drawings
Fig. 1 system interfacial tension is to the dependency (70.0 ± 0.1 ℃) of HPAM concentration.X-coordinate is the time, and ordinate zou is the interfacial tension of flooding system and Shengli Oil Field crude oil.
Fig. 2 CTAB concentration is to the influence (70.0 ± 0.1 ℃) of interfacial tension.X-coordinate is the time, and ordinate zou is an interfacial tension.
Fig. 3 salinity is to the influence (70.0 ± 0.1 ℃) of compound system interfacial tension.X-coordinate is the time, and ordinate zou is an interfacial tension.
Fig. 4 and Fig. 5 are the influence (70.0 ± 0.1 ℃) of factors such as compound system different components to interfacial tension.X-coordinate is the time, and ordinate zou is an interfacial tension.Wherein, XC is an xanthan gum, and CTAB is the cats product cetyl trimethylammonium bromide, CPB is the hexadecyl pyridinium bromide, HPAM is a hydro-polyacrylamide, and Triton X-100 is an iso-octyl phenolic group Soxylat A 25-7, and Tyloxapol is an isooctyl phenol formaldehyde resin Soxylat A 25-7.
The apparent viscosity of Fig. 6 Triton X-100 system during with the different proportioning of CTAB is with the variation (70.0 ± 0.1 ℃) of shearing rate.X-coordinate is a shearing rate, and ordinate zou is an apparent viscosity.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples, but be not limited thereto.
Embodiment 1: the flooding system that is used for improving behind the polymer flooding recovery ratio
Raw material: hydro-polyacrylamide 17.0g, iso-octyl phenolic group Soxylat A 25-7 (Triton X-100) 7.5g, cetyl trimethylammonium bromide 2.5g, sodium-chlor 46.3g, calcium chloride 1.52g, magnesium chloride 2.18g, pure water 9923g.
Above raw material is joined in the mixing tank that has whipping appts, at room temperature stir and got final product in 1-2 hour.
In temperature is that 70 ℃, shearing rate are 7s
-1The time record system viscosity be that 13.2mPas, minimum interfacial tension are 2.8 * 10
-3MNm
-1After three absorption of quartz sand and reservoir sand (sorbent material and adsorbate mass ratio are 1: 3), the viscosity of system be respectively 29.6 and 15.8mPas, minimum interfacial tension be respectively 4.8 * 10
-3MNm
-1, 3.0 * 10
-3MNm
-1
Embodiment 2: the flooding system that is used for improving behind the polymer flooding recovery ratio
Raw material: hydro-polyacrylamide 17.0g, iso-octyl phenolic group Soxylat A 25-7 (Triton X-100) 7.5g, cetyl trimethylammonium bromide 2.5g, Gudao area of Shengli Oilfield oil recovery factory local water 9973g.
Above raw material is joined in the mixing tank that has whipping appts, at room temperature stir and got final product in 1-2 hour.
In temperature is that 70 ℃, shearing rate are 7s
-1The time record system viscosity be that 16.5mPas, minimum interfacial tension are 4.6 * 10
-3MN/m; After three absorption of quartz sand and reservoir sand (sorbent material and adsorbate mass ratio are 1: 3), the viscosity of system be respectively 48.1 and 25.3mPas, minimum interfacial tension be respectively 8.3 * 10
-3MNm
-1, 6.4 * 10
-4MNm
-1
Embodiment 3: the flooding system that is used for improving behind the polymer flooding recovery ratio
Raw material: hydro-polyacrylamide 17.0g, xanthan gum 3.0g, Triton X-100 (OP-6) 7.5g, cetyl trimethylammonium bromide 2.5g, sodium-chlor 46.3g, calcium chloride 1.52g, magnesium chloride 2.18g, pure water 9920g.
Above raw material is joined in the mixing tank that has whipping appts, at room temperature stir and got final product in 1-2 hour.
In temperature is that 70 ℃, shearing rate are 7s
-1The time record system viscosity be that 12.7mPas, minimum interfacial tension are 1.3 * 10
-3MNm
-1After three absorption of quartz sand and reservoir sand (sorbent material and adsorbate mass ratio are 1: 3), the viscosity of system be respectively 31.4 and 19.0mPas, minimum interfacial tension be respectively 1.2 * 10
-3MNm
-1, 3.2 * 10
-3MNm
-1
Embodiment 4: the flooding system that is used for improving behind the polymer flooding recovery ratio
Raw material: hydro-polyacrylamide 17.0g, xanthan gum 3.0g, Triton X-100 (OP-6) 7.5g, hexadecyl pyridinium bromide (CPB) 2.5g, sodium-chlor 46.3g, calcium chloride 1.52g, magnesium chloride 2.18g, pure water 9920g.
Above raw material is joined in the mixing tank that has whipping appts, at room temperature stir and got final product in 1-2 hour.
In temperature is that 70 ℃, shearing rate are 7s
-1The time record system viscosity be that 16.97mPas, minimum interfacial tension are 5.9 * 10
-5MNm
-1After five absorption of reservoir sand (sorbent material and adsorbate mass ratio are 1: 3), the viscosity of system is that 29.1mPas, minimum interfacial tension are 2.7 * 10
-3MNm
-1
Embodiment 5: the flooding system that is used for improving behind the polymer flooding recovery ratio
Raw material: hydro-polyacrylamide 17.0g, isooctyl phenol formaldehyde resin Soxylat A 25-7 (Tyloxapol) 7.5g, cetyl trimethylammonium bromide 2.5g, sodium-chlor 46.3g, calcium chloride 1.52g, magnesium chloride 2.18g, pure water 9923g.
Above raw material is joined in the mixing tank that has whipping appts, at room temperature stir and got final product in 1-2 hour.
In temperature is that 70 ℃, shearing rate are 7s
-1The time record system viscosity be that 12.5mPas, minimum interfacial tension are 9 * 10
-5MNm
-1
Claims (3)
1. flooding system that is used for improving behind the polymer flooding oil recovery factor is characterized in that, by mass percentage consisting of of this flooding system:
Cats product 0.01-0.2%
Anionic water-soluble polymer weight polymers 0.1-0.2%
Nonionogenic tenside 0.01-0.2%
Additive 0-1.5%
Water surplus;
Described cats product is selected from the dimer of dimer, alkyl imidazole or the alkyl imidazole of cetyl trimethylammonium bromide or cetyl trimethylammonium bromide dimer, alkyl trimethyl pyridinium bromide or alkyl trimethyl pyridinium bromide, in the double hexadecyl dimethyl brometo de amonio one or more;
Described anionic water-soluble polymer weight polymers is a hydro-polyacrylamide, the perhaps combination of hydro-polyacrylamide and xanthan gum, described hydro-polyacrylamide molecular weight 1,400 ten thousand-2,000 ten thousand, degree of hydrolysis 20-40%;
Described nonionogenic tenside is one or more in oligomer, fatty alcohol-polyoxyethylene ether or the aliphatic acid polyethenoxy ether of polyoxyethylene nonylphenol ether, Triton X-100, iso-octyl phenolic group Soxylat A 25-7, iso-octyl phenolic group Soxylat A 25-7;
Described additive is 46.3: 1.52: 2.18 the combination by weight of sodium-chlor, calcium chloride, magnesium chloride.
2. improve the flooding system of recovery ratio behind the polymer flooding according to claim 1, it is characterized in that the oligomer of described iso-octyl phenolic group Soxylat A 25-7 comprises dimer, tripolymer or heptamer isooctyl phenol formaldehyde resin Soxylat A 25-7.
3. improve the preparation method of the flooding system of recovery ratio behind the described polymer flooding of claim 1, step is as follows:
Anionic water-soluble polymer weight polymers, cats product, nonionogenic tenside, additive and water are joined in the mixing tank that has whipping appts in proportion, at room temperature stirred 1-2 hour, promptly.
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| EP4244302A4 (en) * | 2020-11-30 | 2024-10-09 | Univ Wyoming | Methods and formulations for enhanced oil recovery |
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