WO2015067209A1 - Heavy oil spontaneous emulsifying and viscosity-reducing system and preparation method therefor - Google Patents
Heavy oil spontaneous emulsifying and viscosity-reducing system and preparation method therefor Download PDFInfo
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- WO2015067209A1 WO2015067209A1 PCT/CN2014/090568 CN2014090568W WO2015067209A1 WO 2015067209 A1 WO2015067209 A1 WO 2015067209A1 CN 2014090568 W CN2014090568 W CN 2014090568W WO 2015067209 A1 WO2015067209 A1 WO 2015067209A1
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- the invention belongs to the field of oilfield chemistry, in particular to an oilfield chemical agent, in particular, a chemical agent for spontaneous emulsification and viscosity reduction for viscosity reduction mining of heavy oil reservoirs and a preparation method thereof are designed.
- the heavy oil emulsification and viscosity reduction technology has the advantages of large viscosity reduction, simple process, low investment and quick effect. Therefore, heavy oil emulsification and viscosity reduction technology has been widely concerned in recent years, and the emulsified viscosity reducer with low development cost and low dosage has become One of the hot spots.
- the application No. 00122841.2 discloses a heavy oil emulsified viscosity reducer, which is an aryl-terminated polyoxyethylene ether type nonionic surfactant and a substituted aromatic acid or aromatic sulfonic acid type anion. a condensate of a surfactant.
- the document of Application No. 201210458558.5 discloses a heavy oil emulsified viscosity reducing agent containing a hydrophobic associative polymer AP-P4, an emulsifier HD, sodium hydroxide, and a method for preparing and using the same; Weight percentage: hydrophobic associative polymer: 0.01% to 0.1%; emulsifier: 0.3% to 0.8%; sodium hydroxide: 0.1% to 0.2%; the balance is water.
- the use of a polymer increases the viscosity of the viscosity reducing system and increases the difficulty in separating the oil and water from the produced liquid.
- the document of Application No. 200710119729.0 discloses a heavy oil emulsified viscosity reducer, the weight ratio of the raw material components is: A, disodium lauryl sulfosuccinate: 1.5% to 5%; B, emulsifier OP-15: 3% to 15%; C, hydrogen Sodium oxide: 0.5% to 1%; D, sodium carbonate: 0.8% to 2.5%; E, sodium hydrogencarbonate: 0.5% to 1.5%; F, the rest is water. If the concentration is too high, the oilfield has a high production cost and is not suitable for promotion.
- the present invention provides a spontaneous emulsification and viscosity reduction system suitable for viscosity reduction mining of heavy oil reservoirs. After the system is injected into the heavy oil reservoir formation, the system is relied on without external work. The self-acting action of the sticking system quickly peels off and disperses the heavy oil in the formation, and automatically emulsifies the originally immiscible heavy oil and water to form a low-viscosity emulsion.
- the present invention adopts the following scheme:
- a heavy oil spontaneous emulsification viscosity reducing system comprising: a main surfactant, a co-surfactant, a base, a salt and water; and is characterized in that:
- the mass fraction of the main surfactant in the total mass of the heavy oil spontaneous emulsification viscosity reduction system is 1.0% to 3.0%;
- the mass fraction of the co-surfactant in the total mass of the heavy oil spontaneous emulsification viscosity reduction system is 2.0% to 4.0%;
- the mass fraction of alkali in the total mass of the spontaneous oil emulsified viscosity reduction system of heavy oil is 0.2% to 0.5%;
- the mass fraction of the salt in the total mass of the spontaneous oil emulsified viscosity reduction system of the heavy oil is 1.0% to 5.0%;
- the balance is water, and the sum of the mass fractions of the components is 100%.
- the main surfactant, co-surfactant, alkali and salt are uniformly dispersed in the liquid in order, so that the mass fraction of the main surfactant in the heavy oil spontaneous emulsification and viscosity reduction system is 1.0%. ⁇ 3.0%, the mass fraction of co-surfactant is 2.0%-4.0%, the mass fraction of alkali is 0.2%-0.5%, the mass fraction of salt is 1.0%-5.0%, and then stirring is continued for 5 minutes to obtain heavy oil. Spontaneous emulsification viscosity reduction system.
- the present invention has the following advantages:
- the heavy oil spontaneous emulsification and viscosity reduction system can make the oil-water interfacial tension reach the level of 10 -3 mN/m in the range of heavy oil reservoir temperature 40-60 °C and oil-water ratio in the range of 1:9-7:3.
- the viscosity of the emulsion can be as low as 19.15 mPa ⁇ s, and the viscosity reduction rate can reach 98% or more.
- the spontaneous emulsification and viscosity reduction system of the heavy oil of the present invention has a short spontaneous emulsification time, usually in the range of 1 to 3 hours.
- Spontaneous emulsification and viscosity reduction system can significantly reduce the viscosity of the formation heavy oil, reduce the flow resistance of the formation heavy oil, and at the same time increase the sweep volume and sweep efficiency of the viscosity reduction system, and improve the development of heavy oil. effect.
- Heavy oil spontaneous emulsification and viscosity reduction system including: main surfactant, co-surfactant, alkali, salt and water;
- the mass fraction of the main surfactant in the total mass of the heavy oil spontaneous emulsification viscosity reduction system is 1.0% to 3.0%;
- the mass fraction of the co-surfactant in the total mass of the heavy oil spontaneous emulsification viscosity reduction system is 2.0% to 4.0%;
- the mass fraction of alkali in the total mass of the spontaneous oil emulsified viscosity reduction system of heavy oil is 0.2% to 0.5%;
- the mass fraction of the salt in the total mass of the spontaneous oil emulsified viscosity reduction system of the heavy oil is 1.0% to 5.0%;
- the balance is water, and the sum of the mass fractions of the components is 100%.
- the main surfactant is a nonionic surfactant whose structural formula is:
- R is a C 8 -C 12 alkyl group
- the main surfactant can significantly reduce the interfacial tension of heavy oil/water, which is beneficial to the emulsification of heavy oil and the stability of heavy oil emulsion;
- the co-surfactant is an alcohol, preferably n-butanol, which can be changed thick by the addition of a co-surfactant.
- the polarity of the oil enhances the emulsification and solubilization ability of the heavy oil;
- the base is one or two of NaHCO 3 and NaOH.
- the addition of the base can react with the petroleum acid in the heavy oil to form a surfactant, further reducing the viscosity of the heavy oil, and easily emulsification of the heavy oil;
- the water is reclaimed sewage in clean water or treated oil fields
- the salt is sodium chloride, and the addition of the salt can reduce the degree of solvation of the polar portion of the primary surfactant and the co-surfactant, and reduce the concentration of the surfactant used.
- the preparation method of the above heavy oil spontaneous emulsification viscosity reduction system comprises the following steps:
- the main surfactant with a mass fraction of 1.0% to 3.0% is uniformly dispersed in the liquid mixture, and the surfactant is added in a mass fraction of 2.0% to 4.0%, and the mass fraction is 0.2.
- the alkali to 0.5% alkali and the salt having a mass fraction of 1.0% to 5.0% are stirred for 5 minutes to obtain a spontaneous oil emulsified viscosity reducing system.
- the heavy oil and the above-mentioned heavy oil spontaneous emulsification viscosity reduction system are mixed in a mass ratio of 1:9 to 7:3, and are allowed to stand at 40 to 60 ° C for 1 to 3 hours, and can be generated with heavy oil without external work.
- Spontaneous emulsification greatly reduces the viscosity of heavy oil and achieves the purpose of improving the recovery of heavy oil reservoirs.
- Heavy oil spontaneous emulsification and viscosity reduction system including: main surfactant, nonarene phenol polyoxyethylene polyoxypropylene alcohol ether, mass fraction of 3.0%; co-surfactant n-butanol, mass fraction of 4.0%; alkali hydrogen carbonate Sodium, mass fraction of 0.2%, sodium chloride, mass fraction of 1.0% and balance of water, the sum of the mass fractions of the components is 100%.
- the heavy oil with a viscosity of 5963 mPa ⁇ s at 40 ° C and the spontaneous emulsified viscosity reduction system of the heavy oil are mixed for 7 h according to the oil-water ratio of 7:3, so that the oil-water interfacial tension of the heavy oil will be 6.52 ⁇ 10 -3 mN/ m, the viscosity decreased to 28.53 mPa ⁇ s, and the viscosity reduction rate reached 99.52%.
- Heavy oil spontaneous emulsification and viscosity reduction system including: main surfactant, nonarene phenol polyoxyethylene polyoxypropylene alcohol ether, mass fraction of 2.0%; co-surfactant n-butanol, mass fraction of 3.0%; alkali hydrogen carbonate Sodium, a mass fraction of 0.5%, sodium chloride, a mass fraction of 5.0% and the balance of water, the sum of the mass fractions of the components is 100%.
- the heavy oil with a viscosity of 5963 mPa ⁇ s at 50 ° C and the spontaneous emulsified viscosity reduction system of the heavy oil are allowed to stand for 2 h according to the oil-water ratio of 2:1, so that the oil-water interfacial tension of the heavy oil will be 3.78 ⁇ 10 -3 mN/ m, the viscosity decreased to 23.45 mPa ⁇ s, and the viscosity reduction rate reached 99.61%.
- Heavy oil spontaneous emulsification and viscosity reduction system including: main surfactant, nonarene phenol polyoxyethylene polyoxypropylene alcohol ether, mass fraction of 1.0%; co-surfactant n-butanol, mass fraction of 2.0%; alkali hydrogen carbonate Sodium, mass fraction of 0.2%, salt sodium chloride, mass fraction of 3.0% and balance of water, the sum of the mass fractions of each component is 100%.
- the heavy oil with a viscosity of 1822 mPa ⁇ s and the heavy oil spontaneous emulsification viscosity reduction system at 60 ° C were mixed for 1: 3 according to the oil-water ratio of 1:9, so that the oil-water interfacial tension of the heavy oil would be 4.13 ⁇ 10 -3 mN/ m, the viscosity decreased to 19.15 mPa ⁇ s, and the viscosity reduction rate reached 98.95%.
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Abstract
The present invention relates to the field of oilfield chemistry, and specifically relates to a heavy oil spontaneous emulsifying and viscosity-reducing system. The heavy oil spontaneous emulsifying and viscosity-reducing system comprises: a primary surfactant, a secondary surfactant, a base, a salt, and water; the mass fraction of the primary surfactant is 1.0% to 3.0% of the total mass of the heavy oil spontaneous emulsifying and viscosity-reducing system; the mass fraction of the secondary surfactant is 2.0% to 4.0% of the total mass of the heavy oil spontaneous emulsifying and viscosity-reducing system; the mass fraction of the base is 0.2% to 0.5% of the total mass of the heavy oil spontaneous emulsifying and viscosity-reducing system; the mass fraction of the salt is 1.0% to 5.0% of the total mass of the heavy oil spontaneous emulsifying and viscosity-reducing system; the remaining is water; the sum of the mass fractions of all components is 100%. The present invention has the following advantages: the viscosity reduction rate of the heavy oil spontaneous emulsifying and viscosity-reducing system can reach 98% and above, the invention substantially reduces the viscosity of the heavy oil relying on the effect of the spontaneous viscosity-reducing system, and the development effectiveness of heavy oil reserves is enhanced.
Description
本发明属于油田化学领域，具体地，涉及一种油田化学用剂，特别地，设计一种针对稠油油藏降粘开采的自发乳化降粘的化学剂及其制备方法。The invention belongs to the field of oilfield chemistry, in particular to an oilfield chemical agent, in particular, a chemical agent for spontaneous emulsification and viscosity reduction for viscosity reduction mining of heavy oil reservoirs and a preparation method thereof are designed.
我国稠油资源比较丰富，约占石油总储量的30％，因此，稠油的开采占了较大的比重，由于稠油的粘度较大，在地层中的流动阻力较大，常规的方法是很难开采出来的。因此，降低稠油粘度，改善其流动性是稠油油藏开采的关键。目前开采稠油油藏常用热采、稠油改质、掺稀油和化学降粘等方法。这些方法中热采和稠油改质方法能够产生理想的降粘效果，但能源消耗大，成本较高；掺稀油的方法也对采出液后处理无影响，但造成了稀油资源的浪费，使得采油成本较高。而稠油乳化降粘技术具有降粘幅度大、工艺简单、投资少及见效快等优点，因此稠油乳化降粘技术近年来受到广泛关注，开发成本低、用量少的乳化降粘剂成为热点之一。China's heavy oil resources are relatively abundant, accounting for about 30% of the total oil reserves. Therefore, the mining of heavy oil accounts for a large proportion. Due to the high viscosity of heavy oil, the flow resistance in the formation is relatively large. The conventional method is Hard to mine. Therefore, reducing the viscosity of heavy oil and improving its fluidity are the key to heavy oil reservoir exploitation. At present, heavy oil reservoirs are commonly used for thermal recovery, heavy oil upgrading, thinning oil and chemical viscosity reduction. Among these methods, the thermal recovery and heavy oil upgrading methods can produce the desired viscosity reduction effect, but the energy consumption is large and the cost is high; the method of blending the thin oil has no effect on the post-treatment of the production liquid, but causes the oil resources of the thin oil. Waste, making oil production costs higher. The heavy oil emulsification and viscosity reduction technology has the advantages of large viscosity reduction, simple process, low investment and quick effect. Therefore, heavy oil emulsification and viscosity reduction technology has been widely concerned in recent years, and the emulsified viscosity reducer with low development cost and low dosage has become One of the hot spots.
申请号为00122841.2的文献公开了一种稠油乳化降粘剂，稠油乳化降粘剂是芳基封头的聚氧乙烯醚型非离子表面活性剂与取代的芳酸或芳磺酸型阴离子表面活性剂的缩合物。尽管达到相同降粘效果所需的剂量比其它乳化降粘剂所需剂量小，但是工业化程度低，不适宜大规模应用。The application No. 00122841.2 discloses a heavy oil emulsified viscosity reducer, which is an aryl-terminated polyoxyethylene ether type nonionic surfactant and a substituted aromatic acid or aromatic sulfonic acid type anion. a condensate of a surfactant. Although the dose required to achieve the same viscosity reduction effect is smaller than that required for other emulsified viscosity reducers, the degree of industrialization is low and is not suitable for large-scale applications.
申请号为201210458558.5的文献公开了一种稠油乳化降粘剂及制备和使用方法，所述降粘剂中含有疏水缔合聚合物AP-P4、乳化剂HD、氢氧化钠；各组分的重量百分比：疏水缔合聚合物：0.01％～0.1％；乳化剂：0.3％～0.8％；氢氧化钠：0.1％～0.2％；其余为水。由于使用了聚合物增加了降粘体系的粘度，同时增加了产出液油水分离的难度。The document of Application No. 201210458558.5 discloses a heavy oil emulsified viscosity reducing agent containing a hydrophobic associative polymer AP-P4, an emulsifier HD, sodium hydroxide, and a method for preparing and using the same; Weight percentage: hydrophobic associative polymer: 0.01% to 0.1%; emulsifier: 0.3% to 0.8%; sodium hydroxide: 0.1% to 0.2%; the balance is water. The use of a polymer increases the viscosity of the viscosity reducing system and increases the difficulty in separating the oil and water from the produced liquid.
申请号为200710119729.0的文献公开了一种稠油乳化降粘剂，原料组分重量比为：A、磺基琥珀酸单月桂酯二钠：1.5％～5％；B、乳化剂OP-15：3％～15％；C、氢
氧化钠：0.5％～1％；D、碳酸钠：0.8％～2.5％；E、碳酸氢钠：0.5％～1.5％；F、其余为水。使用浓度过高，油田投入生产成本较高，不适宜推广使用。The document of Application No. 200710119729.0 discloses a heavy oil emulsified viscosity reducer, the weight ratio of the raw material components is: A, disodium lauryl sulfosuccinate: 1.5% to 5%; B, emulsifier OP-15: 3% to 15%; C, hydrogen
Sodium oxide: 0.5% to 1%; D, sodium carbonate: 0.8% to 2.5%; E, sodium hydrogencarbonate: 0.5% to 1.5%; F, the rest is water. If the concentration is too high, the oilfield has a high production cost and is not suitable for promotion.
因此，为了最大限度地提高稠油油藏的采收率，需要开发一种新的稠油乳化降粘体系，既能显著降低稠油的粘度，使其易于流动，便于开采，同时又能够与稠油发生自发乳化，扩大了降粘体系的波及体积和波及效率，实现提高稠油油藏开发效果的目标。Therefore, in order to maximize the recovery of heavy oil reservoirs, it is necessary to develop a new heavy oil emulsified viscosity reduction system, which can significantly reduce the viscosity of heavy oil, make it easy to flow, easy to mine, and at the same time The heavy oil spontaneously emulsifies, which expands the sweep volume and sweep efficiency of the viscosity reduction system, and achieves the goal of improving the development effect of heavy oil reservoirs.
发明内容Summary of the invention
为克服现有技术的缺陷，本发明提供一种适用于稠油油藏降粘开采的自发乳化降粘体系，该体系注入稠油油藏地层后，在不需外界做功的情况下，依靠降粘体系的自身作用，迅速将地层稠油剥离、分散，使原本不相混溶的稠油和水两相自动乳化形成低粘度的乳状液。In order to overcome the defects of the prior art, the present invention provides a spontaneous emulsification and viscosity reduction system suitable for viscosity reduction mining of heavy oil reservoirs. After the system is injected into the heavy oil reservoir formation, the system is relied on without external work. The self-acting action of the sticking system quickly peels off and disperses the heavy oil in the formation, and automatically emulsifies the originally immiscible heavy oil and water to form a low-viscosity emulsion.
为实现上述目的，本发明采用下述方案：To achieve the above object, the present invention adopts the following scheme:
一种稠油自发乳化降粘体系，包括：主表面活性剂、助表面活性剂、碱、盐和水；其特征在于：A heavy oil spontaneous emulsification viscosity reducing system comprising: a main surfactant, a co-surfactant, a base, a salt and water; and is characterized in that:
主表面活性剂在稠油自发乳化降粘体系总质量中的质量分数为1.0％～3.0％；The mass fraction of the main surfactant in the total mass of the heavy oil spontaneous emulsification viscosity reduction system is 1.0% to 3.0%;
助表面活性剂在稠油自发乳化降粘体系总质量中的质量分数为2.0％～4.0％；The mass fraction of the co-surfactant in the total mass of the heavy oil spontaneous emulsification viscosity reduction system is 2.0% to 4.0%;
碱在稠油自发乳化降粘体系总质量中的质量分数为0.2％～0.5％；The mass fraction of alkali in the total mass of the spontaneous oil emulsified viscosity reduction system of heavy oil is 0.2% to 0.5%;
盐在稠油自发乳化降粘体系总质量中的质量分数为1.0％～5.0％；The mass fraction of the salt in the total mass of the spontaneous oil emulsified viscosity reduction system of the heavy oil is 1.0% to 5.0%;
余量为水，各组分质量分数之和为100％。The balance is water, and the sum of the mass fractions of the components is 100%.
上述的稠油自发乳化降粘体系的制备方法，其特征在于：包括如下步骤：The above preparation method of the heavy oil spontaneous emulsification viscosity reduction system is characterized in that the method comprises the following steps:
室温下(20±5℃)，将主表面活性剂、助表面活性剂、碱和盐依次均匀分散在配液水中，使稠油自发乳化降粘体系中主表面活性剂的质量分数为1.0％～3.0％，助表面活性剂的质量分数为2.0％～4.0％，碱的质量分数为0.2％～0.5％，盐的质量分数为1.0％～5.0％，然后再继续搅拌5分钟，得稠油自发乳化降粘体系。At room temperature (20±5°C), the main surfactant, co-surfactant, alkali and salt are uniformly dispersed in the liquid in order, so that the mass fraction of the main surfactant in the heavy oil spontaneous emulsification and viscosity reduction system is 1.0%. ~3.0%, the mass fraction of co-surfactant is 2.0%-4.0%, the mass fraction of alkali is 0.2%-0.5%, the mass fraction of salt is 1.0%-5.0%, and then stirring is continued for 5 minutes to obtain heavy oil. Spontaneous emulsification viscosity reduction system.
与现有的技术相比，本发明具有如下优势：
Compared with the prior art, the present invention has the following advantages:
(1)、稠油自发乳化降粘体系能在稠油油藏温度40～60℃、油水比在1:9～7:3范围内使油水界面张力达到10-3mN/m数量级别，形成的乳状液的粘度最低可达19.15mPa·s，降粘率可达到98％以上。(1) The heavy oil spontaneous emulsification and viscosity reduction system can make the oil-water interfacial tension reach the level of 10 -3 mN/m in the range of heavy oil reservoir temperature 40-60 °C and oil-water ratio in the range of 1:9-7:3. The viscosity of the emulsion can be as low as 19.15 mPa·s, and the viscosity reduction rate can reach 98% or more.
(2)、稠油自发乳化降粘体系的降粘效果明显优于单独使用水溶性或油溶性降粘剂的效果；且在不需外界做功的情况下，依靠自发降粘体系的自身作用，实现稠油粘度大幅度地降低，提高稠油油藏的开发效果。(2) The viscosity reduction effect of the heavy oil spontaneous emulsification and viscosity reduction system is obviously better than the effect of using water-soluble or oil-soluble viscosity reducer alone; and relying on the self-acting effect of the spontaneous viscosity reduction system without external work. The viscosity of the heavy oil is greatly reduced, and the development effect of the heavy oil reservoir is improved.
(3)、本发明的稠油自发乳化降粘体系自发乳化时间较短，通常在1～3h。(3) The spontaneous emulsification and viscosity reduction system of the heavy oil of the present invention has a short spontaneous emulsification time, usually in the range of 1 to 3 hours.
(4)、自发乳化降粘体系可显著地降低了地层稠油的粘度，减小了地层稠油的流动阻力，同时又可以提高降粘体系的波及体积和波及效率，提高了稠油的开发效果。(4) Spontaneous emulsification and viscosity reduction system can significantly reduce the viscosity of the formation heavy oil, reduce the flow resistance of the formation heavy oil, and at the same time increase the sweep volume and sweep efficiency of the viscosity reduction system, and improve the development of heavy oil. effect.
稠油自发乳化降粘体系，包括：主表面活性剂、助表面活性剂、碱、盐和水；其中：Heavy oil spontaneous emulsification and viscosity reduction system, including: main surfactant, co-surfactant, alkali, salt and water;
主表面活性剂在稠油自发乳化降粘体系总质量中的质量分数为1.0％～3.0％；The mass fraction of the main surfactant in the total mass of the heavy oil spontaneous emulsification viscosity reduction system is 1.0% to 3.0%;
助表面活性剂在稠油自发乳化降粘体系总质量中的质量分数为2.0％～4.0％；The mass fraction of the co-surfactant in the total mass of the heavy oil spontaneous emulsification viscosity reduction system is 2.0% to 4.0%;
碱在稠油自发乳化降粘体系总质量中的质量分数为0.2％～0.5％；The mass fraction of alkali in the total mass of the spontaneous oil emulsified viscosity reduction system of heavy oil is 0.2% to 0.5%;
盐在稠油自发乳化降粘体系总质量中的质量分数为1.0％～5.0％；The mass fraction of the salt in the total mass of the spontaneous oil emulsified viscosity reduction system of the heavy oil is 1.0% to 5.0%;
余量为水，各组分质量分数之和为100％。The balance is water, and the sum of the mass fractions of the components is 100%.
主表面活性剂为非离子型表面活性剂，其结构式为：The main surfactant is a nonionic surfactant whose structural formula is:
式中，R为C8～C12的烷基；n为乙氧基团的加合数，n＝8～10；m为丙氧基团的加合数，m＝1～2，其中n，m为整数。主表面活性剂可显著降低稠油/水的界面张力，有利于稠油的乳化和提高稠油乳状液的稳定性；Wherein R is a C 8 -C 12 alkyl group; n is an addition number of an ethoxy group, n = 8 to 10; m is an addition number of a propoxy group, m = 1 to 2, wherein n , m is an integer. The main surfactant can significantly reduce the interfacial tension of heavy oil/water, which is beneficial to the emulsification of heavy oil and the stability of heavy oil emulsion;
助表面活性剂为醇类，优选的，为正丁醇，通过加入助表面活性剂可以改变稠
油的极性，增强对稠油的乳化增溶能力；The co-surfactant is an alcohol, preferably n-butanol, which can be changed thick by the addition of a co-surfactant.
The polarity of the oil enhances the emulsification and solubilization ability of the heavy oil;
碱为NaHCO3、NaOH的一种或两种，碱的加入可以与稠油中的石油酸反应生成表面活性剂，进一步降低稠油粘度，易于使稠油乳化；The base is one or two of NaHCO 3 and NaOH. The addition of the base can react with the petroleum acid in the heavy oil to form a surfactant, further reducing the viscosity of the heavy oil, and easily emulsification of the heavy oil;
水为清水或经过处理的油田回注污水；The water is reclaimed sewage in clean water or treated oil fields;
盐为氯化钠，盐的加入可以减少主表面活性剂和助表面活性剂极性部分的溶剂化程度，降低表面活性剂的使用浓度。The salt is sodium chloride, and the addition of the salt can reduce the degree of solvation of the polar portion of the primary surfactant and the co-surfactant, and reduce the concentration of the surfactant used.
上述稠油自发乳化降粘体系的制备方法，包括如下步骤：The preparation method of the above heavy oil spontaneous emulsification viscosity reduction system comprises the following steps:
室温下(20±5℃)，将质量分数为1.0％～3.0％的主表面活性剂均匀分散在配液水中，依次加入质量分数为2.0％～4.0％的助表面活性剂、质量分数为0.2％～0.5％的碱、质量分数为1.0％～5.0％的盐，搅拌5分钟，得稠油自发乳化降粘体系。At room temperature (20 ± 5 ° C), the main surfactant with a mass fraction of 1.0% to 3.0% is uniformly dispersed in the liquid mixture, and the surfactant is added in a mass fraction of 2.0% to 4.0%, and the mass fraction is 0.2. The alkali to 0.5% alkali and the salt having a mass fraction of 1.0% to 5.0% are stirred for 5 minutes to obtain a spontaneous oil emulsified viscosity reducing system.
将稠油与上述的稠油自发乳化降粘体系按照1:9～7:3质量比混合，40～60℃下静置1～3h，在不需外界做功的情况下，能与稠油发生自发乳化使稠油粘度大幅度降低，达到提高稠油油藏采收率的目的。The heavy oil and the above-mentioned heavy oil spontaneous emulsification viscosity reduction system are mixed in a mass ratio of 1:9 to 7:3, and are allowed to stand at 40 to 60 ° C for 1 to 3 hours, and can be generated with heavy oil without external work. Spontaneous emulsification greatly reduces the viscosity of heavy oil and achieves the purpose of improving the recovery of heavy oil reservoirs.
实施例1：Example 1:
稠油自发乳化降粘体系，包括：主表面活性剂九烷基酚聚氧乙烯聚氧丙烯醇醚，质量分数为3.0％；助表面活性剂正丁醇，质量分数为4.0％；碱碳酸氢钠，质量分数为0.2％、盐氯化钠，质量分数为1.0％和余量的水，各组分质量分数之和为100％。Heavy oil spontaneous emulsification and viscosity reduction system, including: main surfactant, nonarene phenol polyoxyethylene polyoxypropylene alcohol ether, mass fraction of 3.0%; co-surfactant n-butanol, mass fraction of 4.0%; alkali hydrogen carbonate Sodium, mass fraction of 0.2%, sodium chloride, mass fraction of 1.0% and balance of water, the sum of the mass fractions of the components is 100%.
室温下，在91.8g清水中边搅拌依次加入主表面活性剂九烷基酚聚氧乙烯聚氧丙烯醇醚3g、助表面活性剂正丁醇4g、碱碳酸氢钠0.2g和盐氯化钠1g，均匀搅拌5分钟配制而成稠油自发乳化降粘体系。At room temperature, 3 g of the main surfactant, nonylphenol polyoxyethylene polyoxypropylene glycol ether, 4 g of the co-surfactant n-butanol, 0.2 g of sodium hydrogencarbonate, and sodium chloride, were added in a stirred manner at 91.8 g of clean water. 1g, evenly stirred for 5 minutes to prepare a heavy oil spontaneous emulsification and viscosity reduction system.
在40℃下将粘度为5963mPa·s的稠油与该稠油自发乳化降粘体系按照油水比7:3混合静置2h，可使稠油的油水界面张力将至6.52×10-3mN/m，粘度降至28.53mPa·s，降粘率达到99.52％。The heavy oil with a viscosity of 5963 mPa·s at 40 ° C and the spontaneous emulsified viscosity reduction system of the heavy oil are mixed for 7 h according to the oil-water ratio of 7:3, so that the oil-water interfacial tension of the heavy oil will be 6.52×10 -3 mN/ m, the viscosity decreased to 28.53 mPa·s, and the viscosity reduction rate reached 99.52%.
实施例2：
Example 2:
稠油自发乳化降粘体系，包括：主表面活性剂九烷基酚聚氧乙烯聚氧丙烯醇醚，质量分数为2.0％；助表面活性剂正丁醇，质量分数为3.0％；碱碳酸氢钠，质量分数为0.5％、盐氯化钠，质量分数为5.0％和余量的水，各组分质量分数之和为100％。Heavy oil spontaneous emulsification and viscosity reduction system, including: main surfactant, nonarene phenol polyoxyethylene polyoxypropylene alcohol ether, mass fraction of 2.0%; co-surfactant n-butanol, mass fraction of 3.0%; alkali hydrogen carbonate Sodium, a mass fraction of 0.5%, sodium chloride, a mass fraction of 5.0% and the balance of water, the sum of the mass fractions of the components is 100%.
室温下，在89.5g清水中边搅拌依次加入主表面活性剂九烷基酚聚氧乙烯聚氧丙烯醇醚2g、助表面活性剂正丁醇3g、碱碳酸氢钠0.5g和盐氯化钠5g，均匀搅拌5分钟配制而成稠油自发乳化降粘体系。At room temperature, 2 g of the main surfactant, nonavinyl phenol polyoxyethylene polyoxypropylene ether, 2 g of co-surfactant n-butanol, 0.5 g of sodium hydrogencarbonate, and sodium chloride sodium chloride were added successively in 89.5 g of clean water. 5g, evenly stirred for 5 minutes to prepare a heavy oil spontaneous emulsification and viscosity reduction system.
在50℃下将粘度为5963mPa·s的稠油与该稠油自发乳化降粘体系按照油水比2:1混合静置2h，可使稠油的油水界面张力将至3.78×10-3mN/m，粘度降至23.45mPa·s，降粘率达到99.61％。The heavy oil with a viscosity of 5963 mPa·s at 50 ° C and the spontaneous emulsified viscosity reduction system of the heavy oil are allowed to stand for 2 h according to the oil-water ratio of 2:1, so that the oil-water interfacial tension of the heavy oil will be 3.78×10 -3 mN/ m, the viscosity decreased to 23.45 mPa·s, and the viscosity reduction rate reached 99.61%.
实施例3：Example 3:
稠油自发乳化降粘体系，包括：主表面活性剂九烷基酚聚氧乙烯聚氧丙烯醇醚，质量分数为1.0％；助表面活性剂正丁醇，质量分数为2.0％；碱碳酸氢钠，质量分数为0.2％、盐氯化钠，质量分数为3.0％和余量的水，各组分质量分数之和为100％。Heavy oil spontaneous emulsification and viscosity reduction system, including: main surfactant, nonarene phenol polyoxyethylene polyoxypropylene alcohol ether, mass fraction of 1.0%; co-surfactant n-butanol, mass fraction of 2.0%; alkali hydrogen carbonate Sodium, mass fraction of 0.2%, salt sodium chloride, mass fraction of 3.0% and balance of water, the sum of the mass fractions of each component is 100%.
室温下，在93.8g清水中边搅拌依次加入主表面活性剂九烷基酚聚氧乙烯聚氧丙烯醇醚1g、助表面活性剂正丁醇2g、碱碳酸氢钠0.2g和盐氯化钠3g，均匀搅拌5分钟配制而成稠油自发乳化降粘体系。At room temperature, 1 g of the main surfactant, nonavinyl phenol polyoxyethylene polyoxypropylene ether, 1 g of co-surfactant n-butanol, 0.2 g of sodium hydrogencarbonate, and sodium chloride sodium chloride were sequentially added thereto in stirring in 93.8 g of clean water. 3g, evenly stirred for 5 minutes to prepare a heavy oil spontaneous emulsification and viscosity reduction system.
在60℃下将粘度为1822mPa·s的稠油与该稠油自发乳化降粘体系按照油水比1:9混合静置3h，可使稠油的油水界面张力将至4.13×10-3mN/m，粘度降至19.15mPa·s，降粘率达到98.95％。
The heavy oil with a viscosity of 1822 mPa·s and the heavy oil spontaneous emulsification viscosity reduction system at 60 ° C were mixed for 1: 3 according to the oil-water ratio of 1:9, so that the oil-water interfacial tension of the heavy oil would be 4.13×10 -3 mN/ m, the viscosity decreased to 19.15 mPa·s, and the viscosity reduction rate reached 98.95%.
Claims (10)
- 一种稠油自发乳化降粘体系，包括：主表面活性剂、助表面活性剂、碱、盐和水；其特征在于：A heavy oil spontaneous emulsification viscosity reducing system comprising: a main surfactant, a co-surfactant, a base, a salt and water; and is characterized in that:主表面活性剂在稠油自发乳化降粘体系总质量中的质量分数为1.0％～3.0％；The mass fraction of the main surfactant in the total mass of the heavy oil spontaneous emulsification viscosity reduction system is 1.0% to 3.0%;助表面活性剂在稠油自发乳化降粘体系总质量中的质量分数为2.0％～4.0％；The mass fraction of the co-surfactant in the total mass of the heavy oil spontaneous emulsification viscosity reduction system is 2.0% to 4.0%;碱在稠油自发乳化降粘体系总质量中的质量分数为0.2％～0.5％；The mass fraction of alkali in the total mass of the spontaneous oil emulsified viscosity reduction system of heavy oil is 0.2% to 0.5%;盐在稠油自发乳化降粘体系总质量中的质量分数为1.0％～5.0％；The mass fraction of the salt in the total mass of the spontaneous oil emulsified viscosity reduction system of the heavy oil is 1.0% to 5.0%;余量为水，各组分质量分数之和为100％。The balance is water, and the sum of the mass fractions of the components is 100%.
- 根据权利要求1所述的稠油自发乳化降粘体系，其特征在于：主表面活性剂为非离子型表面活性剂，其结构式为：The heavy oil spontaneous emulsification viscosity reduction system according to claim 1, wherein the main surfactant is a nonionic surfactant, and the structural formula is:
式中，R为C8～C12的烷基；n为乙氧基团的加合数，n＝8～10；m为丙氧基团的加合数，m＝1～2，其中n，m为整数。Wherein R is a C 8 -C 12 alkyl group; n is an addition number of an ethoxy group, n = 8 to 10; m is an addition number of a propoxy group, m = 1 to 2, wherein n , m is an integer. - 根据权利要求1-2所述的稠油自发乳化降粘体系，其特征在于：助表面活性剂为醇类。The heavy oil spontaneous emulsification viscosity reducing system according to any one of claims 1-2, wherein the co-surfactant is an alcohol.
- 根据权利要求1-3所述的稠油自发乳化降粘体系，其特征在于：碱为NaHCO3、NaOH的一种或两种。The heavy oil spontaneous emulsification viscosity reduction system according to any one of claims 1 to 3, wherein the base is one or two of NaHCO 3 and NaOH.
- 根据权利要求1-4所述的稠油自发乳化降粘体系，其特征在于：水为清水或经过处理的油田回注污水。The heavy oil spontaneous emulsification and viscosity reduction system according to any one of claims 1 to 4, characterized in that the water is fresh water or treated oil field reinjected sewage.
- 根据权利要求1-5所述的稠油自发乳化降粘体系，其特征在于：盐为氯化钠。The heavy oil spontaneous emulsification viscosity reduction system according to any one of claims 1 to 5, wherein the salt is sodium chloride.
- 根据权利要求1-6所述的稠油自发乳化降粘体系，其特征在于：助表面活性剂为正丁醇。 The heavy oil spontaneous emulsification viscosity reducing system according to any one of claims 1 to 6, characterized in that the co-surfactant is n-butanol.
- 权利要求1-7所述的稠油自发乳化降粘体系的制备方法，其特征在于：包括如下步骤：The method for preparing a heavy oil spontaneous emulsification viscosity reduction system according to any one of claims 1-7, comprising the steps of:室温下，将主表面活性剂、助表面活性剂、碱和盐依次均匀分散在配液水中，使稠油自发乳化降粘体系中主表面活性剂的质量分数为1.0％～3.0％，助表面活性剂的质量分数为2.0％～4.0％，碱的质量分数为0.2％～0.5％，盐的质量分数为1.0％～5.0％，然后再继续搅拌5分钟，得稠油自发乳化降粘体系。The main surfactant, co-surfactant, alkali and salt are uniformly dispersed in the liquid water at room temperature, so that the mass fraction of the main surfactant in the spontaneous emulsification and viscosity reduction system of the heavy oil is 1.0% to 3.0%, and the surface is assisted. The mass fraction of the active agent is 2.0% to 4.0%, the mass fraction of the base is 0.2% to 0.5%, the mass fraction of the salt is 1.0% to 5.0%, and then stirring is further continued for 5 minutes to obtain a spontaneous oil emulsified viscosity reducing system.
- 根据权利要求8所述的稠油自发乳化降粘体系的制备方法，其特征在于：主表面活性剂为非离子型表面活性剂，其结构式为：The method for preparing a heavy oil spontaneous emulsification viscosity reduction system according to claim 8, wherein the main surfactant is a nonionic surfactant, and the structural formula is:
式中，R为C8～C12的烷基；n为乙氧基团的加合数，n＝8～10；m为丙氧基团的加合数，m＝1～2，其中n，m为整数；Wherein R is a C 8 -C 12 alkyl group; n is an addition number of an ethoxy group, n = 8 to 10; m is an addition number of a propoxy group, m = 1 to 2, wherein n , m is an integer;助表面活性剂为醇类；The co-surfactant is an alcohol;碱为NaHCO3、NaOH的一种或两种；The base is one or two of NaHCO 3 and NaOH;水为清水或经过处理的油田回注污水；The water is reclaimed sewage in clean water or treated oil fields;盐为氯化钠。The salt is sodium chloride. - 根据权利要求8-9所述的稠油自发乳化降粘体系，其特征在于：助表面活性剂为正丁醇。 The heavy oil spontaneous emulsification viscosity reducing system according to claims 8-9, characterized in that the co-surfactant is n-butanol.
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