CN102849835A - Method for increasing viscosity of polyacrylamide solution prepared from oilfield produced water - Google Patents

Method for increasing viscosity of polyacrylamide solution prepared from oilfield produced water Download PDF

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CN102849835A
CN102849835A CN2012103047689A CN201210304768A CN102849835A CN 102849835 A CN102849835 A CN 102849835A CN 2012103047689 A CN2012103047689 A CN 2012103047689A CN 201210304768 A CN201210304768 A CN 201210304768A CN 102849835 A CN102849835 A CN 102849835A
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polyacrylamide
produced water
viscosity
solution
sodium
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陈彦广
宋华
李丹丹
宋莹莹
柳艳修
牛瑞霞
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东北石油大学
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Abstract

A method for increasing viscosity of polyacrylamide solution prepared from oilfield produced water. The method comprises the following steps: first adding an organic treatment agent with a concentration of 0.08-0.5g/L to the oilfield produced water; stirring for 30-40min; standing for 3h-4h; adding polyacrylamide; stirring for 2-3 h; and ripening for 24-48h, so as to prepare polyacrylamide solution with concentration of 1000ppm-3000ppm. According to the present invention, the treatment agent is used to reduce the free Ca<2+> and Mg<2+> in the oilfield produced water and eliminate influence of the Ca<2+> and Mg<2+> in the oilfield produced water on the viscosity of the polyacrylamide solution, thus solving the problem of weak oil displacement effect caused by reduced viscosity of the polyacrylamide solution.

Description

一种提高油田采出水配制聚丙烯酰胺溶液粘度的方法 A method for preparation of oilfield produced water increases the solution viscosity of polyacrylamide

[0001] 技术领域: [0001] Technical Field:

本发明涉及油田开采过程中采出水处理技术领域,具体涉及一种利用有机处理剂去除油田采出水中游离Ca2+和Mg2+,实现提高聚丙烯酰胺溶液粘度的方法。 The present invention relates to oil extraction process produced water treatment technologies, and in particular relates to a method of removing an organic treating agent in Produced Water free Ca2 + and Mg2 +, improved solution viscosity of polyacrylamide.

[0002] 背景技术: [0002] BACKGROUND:

随着大庆油田的长期开发,其产油量已开始下降,为了确保大庆油田稳产4000万吨/年,利用化学驱提高采收率将逐渐会成为大庆油田采油的主要趋势。 With the long-term development of the Daqing oil field, its oil production has begun to decline, in order to ensure stable yield 40 million tons of Daqing Oilfield / year, the use of chemical flooding EOR will gradually become the main trend of Daqing oilfield. 在诸多提高采收率技术方法中,聚合物驱,特别是采用聚丙烯酰胺驱油,因为其操作简单、成本低和适应性强而被广泛应用。 In many enhanced oil recovery processes, polymer flooding, particularly polyacrylamide flooding, because of its simple operation, low cost, and adaptability it is widely used. 聚丙烯酰胺溶液通常采用清水配制母液,油田采出污水稀释获得,配制水中的Ca2+和Mg2+离子含量对聚合物溶液性能具有较大影响,即Ca2+和Mg2+和聚丙烯酰胺溶液发生反应,生成絮状物或沉淀,导致其驱油效果变差。 Polyacrylamide solution formulation liquor usually water, diluted with water to obtain an oil mining, water formulated Ca2 + and Mg2 + ion content of the solution has great influence on the properties of the polymer, i.e., Ca2 + and Mg2 +, and polyacrylamide solution reacts flocculent or precipitate, resulting in deterioration of oil displacement effect. 这种方法既需要大量的淡水资源,同时还由于Ca2+和Mg2+与聚丙烯酰胺溶液作用,降低了聚丙烯酰胺溶液粘度,若要保证驱油效果,需要提高聚丙烯酰胺溶液浓度,这样又大大增加了原油采收成本。 This method not only requires a large amount of fresh water, but also because of Ca2 + and Mg2 + and the action of polyacrylamide solution, reduces the solution viscosity of polyacrylamide, to ensure the displacement effect, it is necessary to increase the concentration of polyacrylamide solution, which in turn greatly increase the oil recovery costs. 因此,开发适合油田采出水的Ca2+和Mg2+离子有机处理剂,使得有机处理剂与Ca2+和Mg2+离子发生络合反应,去除游离态Ca2+和Mg2+离子,然后配制聚丙烯酰胺溶液,既减少淡水资源的使用,同时还提高聚丙烯酰胺溶液粘度,降低了聚丙烯酰胺的用量,降低了采油成本。 Thus, development for oilfield produced water of Ca2 + and Mg2 + ions organic treating agent, such that the organic treatment agent Ca2 + and Mg2 + ion complexation reaction, removal of free Ca2 + and Mg2 + ions, and then formulated polyacrylamide solution, reducing the use of freshwater resources while increasing the solution viscosity of polyacrylamide, to reduce the amount of polyacrylamide, to reduce the cost of oil production.

[0003] 发明内容: [0003] SUMMARY OF THE INVENTION:

为了解决背景技术中存在的问题,本发明提供了一种提高油田采出水配制聚丙烯酰胺溶液粘度的方法,本发明通过减少油田采出水中Ca2+和Mg2+离子对聚丙烯酰胺溶液粘度的影响,从而解决由于聚丙烯酰胺溶液粘度降低导致驱油效果变差或采油成本提高的问题。 In order to solve the problems in the background art, the present invention provides a method for preparation of oilfield produced water increases the viscosity of the polyacrylamide solution, the present invention is recovery Mg2 + and Ca2 + ions to impact the water solution viscosity of polyacrylamide by reducing the field to flooding problem or oil deterioration effects due to increased cost reduced solution viscosity of polyacrylamide lead.

[0004] 本发明所采用的技术方案是:该用于含Ca2+和Mg2+的油田采出水回用配制聚丙烯酰胺溶液的方法包括下列步骤:首先向生化处理后油田采出水中加入有机处理剂,有机处理剂的浓度为O. 08g/L〜O. 5g/L,搅拌30 min〜40min,静止放置3h〜4h,再加入聚丙烯酰胺,搅拌2h〜3h,熟化24h〜48h,配得聚丙烯酰胺浓度为IOOOppm〜3000ppm的溶液;其中处理剂为2,3- 二羟基丁二酸钠钾、2-羟基丙烷-1,2,3-三羧酸钠、1,2,3,4,5-五羟基己酸钠、羟基乙叉二磷酸、三乙醇胺、乙二胺四乙酸二钠、氨基三甲叉膦钠、2-膦酸丁烷-1,2,4-三羧酸中的一种或几种混合物。 [0004] The technical proposal of the present invention: the means for containing Ca2 + and oil Mg2 + produced water reuse formulated polyacrylamide solution comprising the steps of: firstly produced water is added to the organic treatment agent into the biological treatment field, concentration of the organic treatment agent is O. 08g / L~O. 5g / L, stirring for 30 min~40min, stand still 3h~4h, polyacrylamide was added, stirred 2h~3h, aged 24h~48h, polypropylene worthy amide solution concentration IOOOppm~3000ppm; wherein the treating agent is 2,3-dihydroxybutanedioic acid, sodium, potassium, sodium 2-hydroxy-1,2,3-tricarboxylic acid, 1,2,3,4,5 - pentahydroxy sodium caproate, hydroxyethylidene diphosphonic acid, triethanolamine, disodium edetate, sodium aminotrimethylene phosphonate, 2-phosphonobutane-1,2,4-tricarboxylic acid, a carboxylic acid or a mixture of several.

[0005] 本发明提出的提高油田采出水配制聚丙烯酰胺溶液粘度的新方法是通过向生化处理后油田采出水中先加入一种有机的Ca2+和Mg2+金属离子处理剂,络合处理一段时间,再加入聚丙烯酰胺配制溶液。 [0005] The present invention proposed a new method to improve oilfield produced water solution viscosity of polyacrylamide prepared by the produced water prior to the biological treatment oil is added an organic Ca2 + and Mg2 + metal ion-treating agent, complexation period of treatment, was added a solution of polyacrylamide prepared. 该处理剂与油田采出水中的Ca2+和Mg2+络合,减少聚丙烯酰胺与Ca2+和Mg2+金属离子反应生成凝胶,降低Ca2+和Mg2+对聚丙烯酰胺粘度的影响,从而保证聚丙烯酰胺溶液具有较高粘度保留率,实现提高聚丙烯酰胺溶液驱油效果的目的。 The treating agent and oil field produced water, Ca2 + and Mg2 + complexes, reducing polyacrylamide Ca2 + and Mg2 + metal ion reacts gel, reducing Ca2 + and Mg2 + on polyacrylamide viscosity, thus ensuring polyacrylamide solutions having relatively high viscosity retention, improved object polyacrylamide solutions oil displacement. 该法操作工艺简便,反应条件温和,处理后水可不经过滤等处理,直接回用于聚丙烯酰胺母液或目的液配制,油田采出水经有机络合剂处理后配制聚丙烯酰胺溶液粘度可提高25-40%。 This method is simple and convenient process, mild reaction conditions, the treated water not treated by filtration, directly back to the mother or for the purpose of polyacrylamide solution preparation, oilfield produced water after the organic complexing agent formulation can increase solution viscosity of polyacrylamide 25-40%.

[0006] 具体实施方式: [0006] DETAILED DESCRIPTION:

下面结合实施例对本发明进一步说明: The following examples further illustrate embodiments in conjunction with the present invention:

实施例I、含Ca2+模拟水的实验(I)参照模拟盐水配制方法(胡博仲,《聚合物驱采油工程》,石油工业出版社,2004,235-235),配制Ca2+浓度为50ppm、矿化度为4500ppm的模拟水。 Example I, water containing Ca2 + simulation experiment (I) refer to the method in saline (Hubo Zhong, "Polymer Engineering EOR", Petroleum Industry Press, 2004,235-235) analog, formulated in a concentration of 50 ppm Ca2 +, salinity analog to 4500ppm water.

[0007] (2)取2-羟基丙烷-1,2,3-三羧酸钠投加到模拟水中,其中2_羟基丙烷_1,2, [0007] (2) 2-hydroxy-1,2,3-tricarboxylic take carboxylate in water administered to the analog, wherein 2_ hydroxypropane _1,2,

3-三羧酸钠投加量分别为O. 19g/L、0. 37g/L,搅拌30min,静止放置3h。 3- dosage acid trisodium are O. 19g / L, 0. 37g / L, stirring for 30min, still placed 3h.

[0008] (3)将聚丙烯酰胺(分子量2500万,水解度25%),分别加入到步骤(2)所得水中和空白模拟水中,搅拌约2h,配得聚丙烯酰胺浓度为2400ppm的溶液,将该溶液于45°C恒温2h,测定该溶液的粘度,并将该粘度记为初始粘度。 [0008] (3) A polyacrylamide (molecular weight of 25,000,000, degree of hydrolysis 25%), were added to the step (2) of water and the resulting white simulation of water, stirred for about 2h, with a solution concentration of polyacrylamide to give a 2400ppm, the temperature was 45 ° C for 2h, the solution viscosity was measured, and referred to the viscosity of the initial viscosity. 继续45°C下恒温2天、2周、一个月后分别测定溶液的粘度。 Continue constant for 2 days, 2 weeks at 45 ° C, were measured one month after the viscosity of the solution. 所得实验结果见表I。 The obtained results are shown in Table I. 由表I可以看出,未投加处理剂时HPAM的一个月后粘度为54.6 mPa*s,投加处理剂2-羟基丙烷-I,2,3-三羧酸钠浓度为0.37g/L,一个月后聚丙烯酰胺溶液粘度为71. 9 mPa · S,粘度提高了31. 7%。 As can be seen from Table I, when not adding the treating agent after one month HPAM viscosity of 54.6 mPa * s, adding the treating agent 2-hydroxy-propane -I, 2,3-trimethyl-carboxylic acid sodium concentration of 0.37g / L , polyacrylamide solution viscosity after one month 71. 9 mPa · S, the viscosity increased 31.7%.

[0009] 2-羟基丙烷-1,2,3-三羧酸钠添加量对聚丙烯酰胺溶液粘度的影响(单位:mPa · s)表I [0009] Effects of sodium 1,2,3-tricarboxylic acid added in an amount of 2-hydroxy-propane polyacrylamide solution viscosity (unit: mPa · s) TABLE I

Figure CN102849835AD00041

实施例2、含Mg2+模拟水的实验 Example 2. Experimental simulation of water containing Mg2 +

(I)参照模拟盐水配制方法(胡博仲,《聚合物驱采油工程》,石油工业出版社,2004,235-235),配制Mg2+浓度为80ppm左右、矿化度为4500ppm左右的模拟水。 (I) in saline with reference to simulation methods (Hu Bozhong, "Polymer Engineering EOR", Petroleum Industry Press, 2004,235-235), prepared Mg2 + concentration is about 80ppm, salinity water of about 4500ppm simulation.

[0010] (2)称取一定量的羟基乙叉二膦酸投加到模拟水中,其中羟基乙叉二膦酸投加量分别为O. 34 g/L、0. 68g/L,搅拌30min,静止放置3h。 [0010] (2), said certain amount of hydroxy-ethylidene diphosphonic acid in water administered to the analog, wherein the hydroxy ethylidene diphosphonic acid, respectively dosage O. 34 g / L, 0. 68g / L, stirring 30min stand still 3h.

[0011] (3)将聚丙烯酰胺(分子量2500万,水解度25%),分别加入到步骤(2)所得水中和空白模拟水中,搅拌约2h,配得聚丙烯酰胺浓度为2400ppm的溶液,将该溶液于45°C恒温2h,测定该溶液的粘度,并将该粘度记为初始粘度。 [0011] (3) A polyacrylamide (molecular weight of 25,000,000, degree of hydrolysis 25%), were added to the step (2) of water and the resulting white simulation of water, stirred for about 2h, with a solution concentration of polyacrylamide to give a 2400ppm, the temperature was 45 ° C for 2h, the solution viscosity was measured, and referred to the viscosity of the initial viscosity. 继续45°C下恒温2天、2周、一个月后分别测定溶液的粘度。 Continue constant for 2 days, 2 weeks at 45 ° C, were measured one month after the viscosity of the solution. 所得实验结果见表2。 The obtained results are shown in Table 2. 由表2可以看出,未投加处理剂时HPAM的一个月后粘度为49. I mPa· S,投加处理剂羟基乙叉二膦酸浓度为O. 68 g/L,一个月后聚丙烯酰胺溶液粘度为66. 2 mPa · S,粘度提高了34. 8%。 As can be seen from Table 2, when not adding the treating agent after one month viscosity HPAM 49. I mPa · S, the treating agent dosage hydroxy ethylidene diphosphonic acid at a concentration of O. 68 g / L, one month after the poly acrylamide solution having a viscosity of 66. 2 mPa · S, the viscosity increased 34.8%.

[0012] 羟基乙叉二膦酸添加量对聚丙烯酰胺溶液粘度的影响(单位:mPa · s)表2 [0012] The addition amount of hydroxy-ethylidene diphosphonic acid on the solution viscosity of polyacrylamide (unit: mPa · s) TABLE 2

Figure CN102849835AD00051

实施例3、含Ca2+和Mg2+的油田实际采出水实验实验步骤如下: Example 3, Ca2 +, and the actual mining oil-containing water The Experiment Mg2 + as follows:

(I)取油田某个采油厂具有代表性的采出水,经生化处理后,水质分析结果为Ca2+浓度为57. 72 mg/L,Mg2+ 浓度为32. 08mg/L,矿化度为4787. 45 mg/L。 (I) an oil production plant to take representative produced water, after the biological treatment, the water quality analysis results Ca2 + concentration was 57. 72 mg / L, Mg2 + concentration 32. 08mg / L, salinity 4787. 45 mg / L.

[0013] (2)分别取三乙醇胺和氨基三甲叉膦酸钠投加到模拟水中,其中三乙醇胺和氨基三甲叉膦酸钠的投加量分别为O. 41g/L、0. 83g/L,搅拌30min,静止放置3h。 [0013] (2) were taken triethanolamine and sodium aminotrimethylene phosphonate to the analog administered in water, wherein the dosage of triethanolamine and sodium aminotrimethylene phosphonate are O. 41g / L, 0. 83g / L , stirred for 30min, still placed 3h.

[0014] (3)取聚丙烯酰胺(分子量2500万,水解度25%),分别加入到步骤(2)所得水中和空白模拟水中,搅拌约2h,配得聚丙烯酰胺浓度为2400ppm的溶液,将该溶液于45°C恒温2h,测定该溶液的粘度,并将该粘度记为初始粘度。 [0014] (3) take polyacrylamide (25 million molecular weight, degree of hydrolysis 25%), were added to the step (2) of water and the resulting white simulation of water, stirred for about 2h, with a solution concentration of polyacrylamide to give a 2400ppm, the temperature was 45 ° C for 2h, the solution viscosity was measured, and referred to the viscosity of the initial viscosity. 继续45°C下恒温2天、2周、一个月后分别测定溶液的粘度。 Continue constant for 2 days, 2 weeks at 45 ° C, were measured one month after the viscosity of the solution. 所得实验结果见表3。 The obtained results are shown in Table 3. 由表3可以看出,未投加处理剂时,一个月后HPAM溶液粘度为47. O mPa-s ;投加处理剂三乙醇胺和氨基三甲叉膦酸钠后,一个月后聚丙烯酰胺溶液粘度为61. I mPa · S,粘度提高了30%。 As can be seen from Table 3, no dosing agent treatment, one month after the solution viscosity of HPAM 47. O mPa-s; sodium after adding the treating agent triethanolamine and amino trimethylene phosphonic month after polyacrylamide solutions viscosity was 61. I mPa · S, the viscosity increased by 30%.

[0015] 三乙醇胺和氨基三甲叉膦酸钠添加量对聚丙烯酰胺溶液粘度的影响(单位:mPa · s)表3 [0015] Effect of the addition amount of sodium trimethylene phosphonic amino triethanolamine and the solution viscosity of polyacrylamide (unit: mPa · s) TABLE 3

Figure CN102849835AD00052

Claims (1)

1. 一种提高油田采出水配制聚丙烯酰胺溶液粘度的方法,包括下列步骤:首先向油田采出水中加入有机处理剂,有机处理剂的浓度为O. 08g/L〜O. 5g/L,搅拌30 min〜40min,静止放置3h〜4h,再加入聚丙烯酰胺,搅拌2h〜3h,熟化24h〜48h,配得聚丙烯酰胺浓度为IOOOppm〜3000ppm的溶液;其中处理剂为2,3-二羟基丁二酸钠钾、2-羟基丙烷-1,2,3-三羧酸钠、1,2,3,4,5-五羟基己酸钠、羟基乙叉二磷酸、三乙醇胺、乙二胺四乙酸二钠、氨基三甲叉膦钠、2-膦酸丁烷-1,2,4-三羧酸中的一种或任意几种混合物。 CLAIMS 1. A method of improving oil field produced water solution viscosity of polyacrylamide prepared, comprising the following steps: First, the produced water treatment agent is added to the organic oil, concentration of the organic treatment agent is O. 08g / L~O 5g / L, stirred for 30 min~40min, stand still 3h~4h, polyacrylamide was added, stirred 2h~3h, aged 24h~48h, IOOOppm~3000ppm solution was obtained with a concentration of polyacrylamide; wherein the treating agent is 2,3- malic acid, sodium, potassium, sodium 2-hydroxy-1,2,3-tricarboxylic acid, sodium 1,2,3,4,5-pentahydroxy-hexyl, hydroxyethylidene diphosphonic acid, triethanolamine, ethylene amine disodium, sodium aminotrimethylene phosphonate, 2-phosphonic acid, 1,2,4-tricarboxylic acid of any one or a mixture of several.
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