CN114426830B - Temperature-resistant salt-resistant efficient fracturing fluid imbibition agent and preparation method and application thereof - Google Patents
Temperature-resistant salt-resistant efficient fracturing fluid imbibition agent and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a temperature-resistant salt-resistant efficient fracturing fluid imbibition agent, which comprises: 30-50 wt% of a nonionic surfactant; 10-20 wt% of gemini surfactant; 0.2 to 1 weight percent of organosilicon surfactant; the balance being water. The invention discloses a preparation method of a temperature-resistant salt-resistant efficient fracturing fluid imbibition agent. The invention also discloses application of the temperature-resistant salt-resistant efficient fracturing fluid imbibition agent in fracturing exploitation of the ultra-low permeability reservoir. The invention has the following beneficial effects: 1. has better surface tension, interfacial tension and capillary imbibition; 2. after high-temperature aging, the coating still has the functions of higher imbibition efficiency, surface tension reduction and interface tension reduction; 3. the synergistic system further improves the interfacial activity and capillary self-absorption height, especially the surface activity; 4. the components of the provided temperature-resistant salt-resistant efficient fracturing fluid imbibition agent are all in the types of temperature resistance, salt resistance, hydrolysis resistance and low stratum adsorption quantity, and the stratum is hardly damaged.
Description
Technical Field
The invention belongs to the technical field of oil exploitation, transportation and chemical engineering, and relates to a temperature-resistant salt-resistant efficient fracturing fluid imbibition agent, and a preparation method and application thereof.
Background
China has found that low permeability oil fields in oil reservoirs account for more than half of the oil reservoirs, and the scale of the low permeability oil field capacity construction accounts for more than 70% of the total oil field capacity construction scale, and the proportion of the low permeability oil field capacity construction scale is increased year by year. However, the recovery ratio of the low-permeability oil field under the prior art condition is lower, and the average recovery ratio of the low-permeability oil field in China is only 21.4 percent and is 12.6 percent lower than 34 percent of the medium-permeability oil field and the high-permeability oil field. At present, the annual average exploitation speed of more than 50 oil fields is less than 0.5 percent, the geological reserve of the low-speed and low-efficiency oil fields is about 3.2 million tons, and the average oil exploitation speed is only 0.27 percent, so that a new technology for improving the recovery efficiency of the low-permeability oil field is a development problem which faces the current and future oil industry for a long time.
Spontaneous imbibition is an important mechanism for increasing the recovery efficiency of unconventional oil reservoirs. The imbibition is a process of spontaneously imbibing the wetting fluid into the pores to expel the non-wetting fluid by means of capillary force, which is the main driving force of the imbibition process. The unconventional oil and gas reservoir has low porosity and permeability and large capillary force, and the larger capillary force can be used as the power for oil displacement, thereby increasing the development effect. Therefore, the research on the imbibition under the action of capillary force has important significance for the development of unconventional oil and gas reservoirs. However, most of the existing researches use the common surfactants in the market, the improvement and the research and development work aiming at the imbibition are relatively less, and the experimental effect is limited.
Zhang Xue Peng, wang Lei and Gao super Feng, preparation and application of imbibition surfactant for fracturing [ J]2019, shanxi university of science and technology, discloses an imbibition surfactant for fracturing, wherein the imbibition synergistic surfactant ANS is of a molecular general formula R (OR) 1 ) 5 OOCCH(SO 3 Na)CH 2 COO(OR 1 ) 5 R, but the preparation reaction conditions of the seepage surfactant for fracturing are relatively harsh, the operation is not easy, and the reaction product contains functional group ester groups and is easy to hydrolyze and lose efficacy.
Wangxiang, yangjiang, research on enhanced recovery ratio by imbibition of fracturing fluid [ J ]. Xian Petroleum university, 2018, discloses an imbibition agent for fracturing, which is a cationic surfactant of Cetyl Trimethyl Ammonium Bromide (CTAB), but has large stratum adsorption loss.
Therefore, the fracturing fluid imbibition agent with simpler process, higher temperature resistance and salt resistance, stronger stratum adsorption resistance and higher imbibition speed is developed, and the fracturing fluid imbibition agent has great significance for improving the recovery ratio of the low-permeability tight oil reservoir.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects of the prior art, the invention discloses a temperature-resistant salt-resistant efficient fracturing fluid imbibition agent, and a preparation method and application thereof. The temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent can improve the wettability of the wall surface of a crack, adjust the oil-water interfacial tension, improve the surface of a rock stratum into hydrophilicity, increase the capillary force and promote the spontaneous imbibition.
The technical scheme is as follows: the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent comprises the following components in percentage by mass:
30-50 wt% of a nonionic surfactant;
10-20 wt% of gemini surfactant;
0.2 to 1wt% of an organosilicon surfactant;
the balance being water.
Further, comprising:
35-45 wt% of a nonionic surfactant;
15-20 wt% of gemini surfactant;
0.3 to 0.5 weight percent of organosilicon surfactant;
the balance being water.
Further, the silicone surfactant has a formula as shown in formula A:
R 1 、R 2 are all C4-C9 alkyl;
m is 2 or 3;
n is 2 or 3;
y is COO - Or SO3 2- 。
It will be appreciated that the alkyl siloxane backbone of the silicone surfactant molecule replaces the carbon hydrocarbon chain of a typical surfactant molecule, has a lower surface tension in solution at equivalent concentrations, has a stronger surface activity than carbon chain hydrocarbon surfactants, and is synergistic with other components of the formulation.
Further, R 1 、R 2 Are all C4 alkyl groups.
Further, the gemini surfactant has a molecular formula shown as formula B:
m is a monovalent metal cation;
m is a positive integer, and m is more than or equal to 4 and less than or equal to 8.
It will be appreciated that gemini surfactants are more readily adsorbed on gas/liquid surfaces, thereby converting oil-wet surfaces to water-wet surfaces and increasing the imbibition effect. In addition, the surface tension of water can be effectively reduced.
Further, M is potassium ion or sodium ion.
Further, the nonionic surfactant has a molecular formula as shown in formula C:
wherein R is 3 Is C4-C6 alkane;
m is 1 or 2 or 3;
n is 1 or 2 or 3.
It will be appreciated that the nonionic surfactant, unlike other nonionic surfactants, has no cloud point and can be used over a wide temperature range. In addition, after being compounded with an anionic surfactant, the modified polyvinyl acetal has good surface activity.
Further, R 3 Is C4 alkane.
The preparation method of the temperature-resistant salt-resistant efficient fracturing fluid imbibition agent comprises the following steps:
(1) Measuring 1/3-3/4 of the required water amount according to the formula amount, adding the water amount into a reaction kettle, and heating to 30-60 ℃;
(2) Adding the gemini surfactant and the nonionic surfactant into the reaction kettle according to the formula ratio, stirring to completely dissolve the gemini surfactant and the nonionic surfactant, and then entering the step (3);
(3) And adding the organic silicon surfactant and the residual water in the formula amount into the reaction kettle, stirring to completely dissolve the organic silicon surfactant, and uniformly stirring to obtain the temperature-resistant salt-resistant efficient fracturing fluid imbibition agent.
The temperature-resistant salt-resistant efficient fracturing fluid imbibition agent is suitable for the conditions that the formation temperature is less than or equal to 150 ℃, the formation water mineralization is less than or equal to 19334mg/L, and the permeability is less than or equal to 50 multiplied by 10 -3 um 2 The application in ultra-low permeability reservoir fracturing exploitation.
Furthermore, the seepage and absorption surface tension of the temperature-resistant salt-resistant efficient fracturing fluid seepage and absorption agent can be as low as 24.327mN/m, and the interfacial tension with kerosene can be as low as 1.2 multiplied by 10 -3 mN/m。
Has the beneficial effects that: compared with the prior art, the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent disclosed by the invention and the preparation method and application thereof have the following beneficial effects:
1. the organic silicon surfactant, the gemini surfactant and the nonionic surfactant are combined to creatively prepare the temperature-resistant salt-resistant efficient fracturing fluid imbibition agent which has better surface tension, interfacial tension and capillary imbibition;
2. according to the provided temperature-resistant salt-resistant efficient fracturing fluid imbibition agent, the organic silicon surfactant and other surfactants act together, and the imbibition agent still has the effects of high imbibition efficiency, surface tension reduction and interface tension reduction after high-temperature aging;
3. the provided temperature-resistant salt-resistant efficient fracturing fluid imbibition agent is a synergistic system constructed by the gemini surfactant and the nonionic surfactant, so that the interfacial activity and capillary self-absorption height, particularly the surface activity, are further improved, and the imbibition effect can be better played by penetrating into small cracks;
4. the components of the provided temperature-resistant salt-resistant efficient fracturing fluid imbibition agent are all in the types of temperature resistance, salt resistance, hydrolysis resistance and low stratum adsorption capacity, and the stratum can hardly be damaged.
The specific implementation mode is as follows:
the following is a detailed description of specific embodiments of the invention.
In order to more clearly and specifically describe the temperature-resistant salt-resistant efficient fracturing fluid imbibition agent and the preparation method thereof provided by the embodiment of the invention, the technical scheme in the embodiment of the invention will be clearly and completely described below, and it is obvious that the described embodiment is only a part of the embodiment of the invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for measuring the product performance comprises the following steps:
1 capillary self-priming height
1.1 preparation of oleophilic capillaries
1.1.1 capillary gauge: the inner diameter of a standard capillary tube is 0.35mm, and carbon tetrachloride and benzene are used in sequence: acetone: ethanol =7 (volume ratio);
1.1.2, sequentially carrying out ultrasonic treatment on the surface of the capillary tube by using a dilute hydrochloric acid solution (1); ultrasonic cleaning with deionized water to remove residual acid until pH is greater than 6.5, and oven drying at 105 deg.C;
1.1.3 preparing aging oil according to the proportion, wherein the aging oil comprises crude oil: aviation kerosene: 90# bitumen = 2; completely immersing the treated capillary tube in aging oil, and aging for 2-4 weeks at the temperature of 60 ℃;
1.1.4 taking out the capillary, soaking the capillary for 2min by using kerosene to clean asphalt deposited on the inner wall and the outer wall of the capillary, wherein the observation is not influenced; and (3) blowing kerosene outside the tube to dry by using nitrogen, and drying the tube in a sealed environment at 60 ℃ to obtain an oil-wet capillary tube, and storing the oil-wet capillary tube for later use.
1.2 test sample preparation
1.2.1 preparing 0.3 percent solution to be detected by distilled water, adding a drop of blue ink, keeping the temperature of the solution at 25 +/-0.2 ℃, pouring the solution to be detected into a cuvette to the boundary of the top end, and tightly attaching a ruler to the rear wall to stand behind;
1.2.2 vertically placing the processed three capillaries in a cuvette, keeping the inclination angles of all capillaries for testing consistent by using a glass slide, reading the height difference between the liquid level in the recording tube and the boundary at the top end of the cuvette, respectively recording the liquid level height of the capillaries when the capillaries are immersed in the liquid level for 1min, and taking the arithmetic mean value as the measurement result.
2 surface tension
Preparing 0.3% sample solution with distilled water, measuring the surface tension value of the prepared fracturing fluid imbibition agent solution with a surface tensiometer at 25 ℃, continuously measuring for three times, and taking the average value.
3 interfacial tension
Preparing 0.3 percent sample solution by using distilled water, taking the prepared fracturing fluid imbibing agent solution, taking kerosene as a low-density phase at the temperature of 70 ℃, measuring the interfacial tension value by a rotating drop method specified by SY/T5370-1999 3.3, continuously measuring for three times, and taking the average value.
4 temperature resistance
Preparing 200g of 0.3% sample solution by using distilled water, sealing, placing in a 150 ℃ oven for aging for 3d, taking out the sample, respectively measuring according to methods 1, 2 and 3, and recording the values of self-priming height, surface tension and interfacial tension after high-temperature aging, wherein the self-priming height is the liquid level height of the capillary tube when the capillary tube is immersed in the liquid level for 10 min.
5 salt tolerance
A0.3% sample solution was prepared with physiological saline and measured by methods 1, 2 and 3, respectively, and values of self-priming height, surface tension and interfacial tension in saline were recorded.
Example 1
The temperature-resistant salt-resistant efficient fracturing fluid imbibition agent comprises the following components in percentage by mass:
30wt% of a nonionic surfactant 1;
20wt% of gemini surfactant 1;
0.5wt% of silicone surfactant 1;
the remaining 49.5wt% was water.
The gemini surfactant 1 used in example 1 has the following structural formula:
the structural formula of the silicone surfactant 1 used in example 1 is as follows:
R 1 、R 2 are all butyl
The nonionic surfactant 1 used in example 1 has the following structural formula:
R 3 is butyl.
m and n are both 3.
The preparation method of the temperature-resistant salt-resistant efficient fracturing fluid imbibition agent comprises the following steps:
(1) Adding 16.5Kg of water into a reaction kettle, and controlling the temperature to be 30 ℃;
(2) Adding 20Kg of gemini surfactant 1 and 30Kg of nonionic surfactant 1 into a reaction kettle, and uniformly stirring;
(3) After the gemini surfactant 1 and the nonionic surfactant 1 in the reaction kettle are dissolved, 0.5Kg of organosilicon surfactant 1 and the rest 33Kg of water are added and evenly stirred to obtain the light yellow transparent temperature-resistant salt-resistant efficient fracturing fluid imbibition agent.
The temperature-resistant salt-resistant efficient fracturing fluid imbibition agent is used at the formation temperatureThe temperature is less than or equal to 150 ℃, the mineralization degree of stratum water is less than or equal to 19334mg/L, and the permeability is less than or equal to 50 multiplied by 10 -3 um 2 The application in ultra-low permeability reservoir fracturing exploitation.
The temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent obtained in example 1 is subjected to surface tension, interfacial tension and capillary self-absorption height measurement under different conditions according to the product performance measurement method, and the results are as follows:
the test results of the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent show that the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent prepared in example 1 can still maintain lower interfacial tension, lower surface tension and higher imbibition speed after high-temperature aging and under high salinity, and the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent is shown to have stronger stratum adsorption resistance and can deeply penetrate into the stratum to play a lasting oil displacement effect.
Example 2
The temperature-resistant salt-resistant efficient fracturing fluid imbibition agent comprises the following components in percentage by mass:
45wt% of nonionic surfactant 2;
13wt% gemini surfactant 2;
0.35wt% of silicone surfactant 2;
the remaining 41.65wt% was water.
The gemini surfactant 2 used in example 2 has the following structural formula:
the structural formula of the silicone surfactant 2 used in example 2 is as follows:
R 1 is hexyl;
R 2 is octyl.
The nonionic surfactant 2 of example 2 has the following structural formula:
R 3 is hexyl.
The preparation method of the temperature-resistant salt-resistant efficient fracturing fluid imbibition agent comprises the following steps:
(1) Adding 31.25Kg of water into the reaction kettle, and controlling the temperature to be 60 ℃;
(2) Adding 13Kg of gemini surfactant 2 and 45Kg of nonionic surfactant 2 into the reaction kettle, and stirring;
(3) After the gemini surfactant 2 and the nonionic surfactant 2 in the reaction kettle are dissolved, 0.35Kg of organic silicon surfactant 2 and the rest 10.4Kg of water are added and stirred uniformly to obtain the light yellow transparent temperature-resistant salt-resistant efficient fracturing fluid imbibition agent.
The temperature-resistant salt-resistant efficient fracturing fluid imbibition agent has the permeability of less than or equal to 50 multiplied by 10 and the salinity of formation water of less than or equal to 19334mg/L at the temperature of the formation of less than or equal to 150 DEG C -3 um 2 The application in ultra-low permeability reservoir fracturing exploitation.
The temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent prepared in example 2 was subjected to surface tension, interfacial tension and capillary self-absorption height measurement under different conditions according to the above product performance measurement method, and the results were as follows:
the test results of the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent show that the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent can still keep lower interfacial tension, lower surface tension and higher imbibition speed after high-temperature aging and under high salinity, and the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent has stronger stratum adsorption resistance and can deeply enter the stratum to play a lasting oil displacement effect.
Example 3
The temperature-resistant salt-resistant efficient fracturing fluid imbibition agent comprises the following components in percentage by mass:
40wt% of a nonionic surfactant 3;
15wt% of gemini surfactant 3;
0.4wt% of silicone surfactant 3;
the remaining 44.6wt% was water.
The gemini surfactant 3 used in example 3 has the formula:
the structural formula of the silicone surfactant 3 used in example 3 is:
R 1 is nonyl;
R 2 is nonyl.
The nonionic surfactant 3 used in example 3 has the following structural formula:
R 3 is a pentyl group.
The preparation method of the temperature-resistant salt-resistant efficient fracturing fluid imbibition agent comprises the following steps:
(1) Adding 31.6Kg of water into the reaction kettle, and controlling the temperature to be 40 ℃;
(2) Adding 15Kg of gemini surfactant 3 and 40Kg of nonionic surfactant 3 into the reaction kettle, and stirring;
(3) After the gemini surfactant 3 and the nonionic surfactant 3 in the reaction kettle are dissolved, 0.4Kg of organosilicon surfactant 3 and the rest 13Kg of water are added and evenly stirred to obtain the light yellow transparent temperature-resistant salt-resistant efficient fracturing fluid imbibition agent.
The temperature-resistant salt-resistant efficient fracturing fluid imbibition agent has the permeability of less than or equal to 50 multiplied by 10 and the salinity of formation water of less than or equal to 19334mg/L at the temperature of the formation of less than or equal to 150 DEG C -3 um 2 The application in ultra-low permeability reservoir fracturing exploitation.
The temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent prepared in example 3 was subjected to surface tension, interfacial tension and capillary self-absorption height measurement under different conditions according to the above product performance measurement method, and the results were as follows:
the test results of the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent show that the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent can still keep lower interfacial tension, lower surface tension and higher imbibition speed after high-temperature aging and under high salinity, and the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent has stronger stratum adsorption resistance and can deeply enter the stratum to play a lasting oil displacement effect.
Example 4
The temperature-resistant salt-resistant efficient fracturing fluid imbibition agent comprises the following components in percentage by mass:
50wt% of a nonionic surfactant 4;
10wt% of gemini surfactant 4;
0.3wt% silicone surfactant 4;
the remaining 39.7wt% was water.
The gemini surfactant 4 used in example 4 has the formula:
the structural formula of the silicone surfactant 4 used in example 4 is:
R 1 is nonyl;
R 2 is butyl.
The nonionic surfactant 4 used in example 4 has the following structural formula:
The preparation method of the temperature-resistant salt-resistant efficient fracturing fluid imbibition agent comprises the following steps:
(1) Adding 29.7Kg of water into the reaction kettle, and controlling the temperature to be 50 ℃;
(2) Adding 10Kg of gemini surfactant 4 and 50Kg of nonionic surfactant 4 into the reaction kettle, and stirring;
(3) After the gemini surfactant 4 and the nonionic surfactant 4 in the reaction kettle are dissolved, 0.3Kg of organic silicon surfactant 4 and the rest 10Kg of water are added and stirred uniformly to obtain the light yellow transparent temperature-resistant salt-resistant efficient fracturing fluid imbibition agent.
The temperature-resistant salt-resistant efficient fracturing fluid imbibition agent has the permeability of less than or equal to 50 multiplied by 10 and the mineralization degree of formation water of less than or equal to 19334mg/L at the formation temperature of less than or equal to 150 DEG C -3 um 2 The application in ultra-low permeability reservoir fracturing exploitation.
The temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent prepared in example 4 was subjected to surface tension, interfacial tension and capillary self-absorption height measurement under different conditions according to the above product performance measurement method, and the results were as follows:
the test results of the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent show that the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent can still keep lower interfacial tension, lower surface tension and higher imbibition speed after high-temperature aging and under high salinity, and the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent has stronger stratum adsorption resistance and can deeply enter the stratum to play a lasting oil displacement effect.
Example 5
The temperature-resistant salt-resistant efficient fracturing fluid imbibition agent comprises the following components in percentage by mass:
35wt% of a nonionic surfactant 5;
17wt% of gemini surfactant 5;
0.45wt% silicone surfactant 5;
the remaining 47.55wt% was water.
The gemini surfactant 5 used in example 5 has the formula:
the structural formula of the silicone surfactant 5 used in example 5 is:
R 1 is nonyl;
R 2 is butyl.
The nonionic surfactant 5 used in example 5 has the following structural formula:
The preparation method of the temperature-resistant salt-resistant efficient fracturing fluid imbibition agent comprises the following steps:
(1) Adding 24Kg of water into a reaction kettle, and controlling the temperature to be 45 ℃;
(2) Adding 17Kg of gemini surfactant 5 and 35Kg of nonionic surfactant 5 into a reaction kettle, and stirring;
(3) After the gemini surfactant 5 and the nonionic surfactant 5 in the reaction kettle are dissolved, 0.45Kg of organosilicon surfactant 5 and the rest 23.55Kg of water are added and stirred uniformly to obtain the light yellow transparent temperature-resistant salt-resistant efficient fracturing fluid imbibition agent.
The temperature-resistant salt-resistant efficient fracturing fluid imbibition agent has the permeability of less than or equal to 50 multiplied by 10 and the salinity of formation water of less than or equal to 19334mg/L at the temperature of the formation of less than or equal to 150 DEG C -3 um 2 The application in the fracturing exploitation of the ultra-low permeability reservoir.
The temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent prepared in example 5 was subjected to surface tension, interfacial tension and capillary self-absorption height measurement under different conditions according to the above product performance measurement method, and the results were as follows:
the test results of the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent show that the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent can still keep lower interfacial tension, lower surface tension and higher imbibition speed after high-temperature aging and under high salinity, and the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent has stronger stratum adsorption resistance and can deeply enter the stratum to play a lasting oil displacement effect.
Comparative example 1
Adding 16.583Kg of water into a reaction kettle, controlling the temperature to be 30 ℃, adding 19.90Kg of gemini surfactant 1 and 29.85Kg of nonionic surfactant 1, and stirring; and after the gemini surfactant 1 and the nonionic surfactant 1 in the reaction kettle are dissolved, adding the rest 31.167Kg of water, and uniformly stirring to obtain the light yellow transparent temperature-resistant salt-resistant efficient fracturing fluid imbibition agent.
The gemini surfactant 1 and the nonionic surfactant 1 used in comparative example 1 have the following structural formulas:
the surface tension, the interfacial tension and the capillary self-suction height under different conditions are respectively measured according to a product performance measuring method, and the results are as follows:
the test results of the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent show that if the mass concentration of other components is kept the same as that in the example 1, the organic silicon surfactant 1 is not added, the interfacial tension, the surface tension and the capillary self-absorption height of the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent are attenuated to a certain degree, and particularly the temperature-resistant index attenuation is particularly obvious. It can be seen that the organosilicon surfactant Si-O bond has large energy and no double bonds, and the organosilicon surfactant and other surfactants act together to ensure that the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent still has good surface tension, interfacial tension and capillary self-absorption height after being aged for 3 days at 150 ℃.
Comparative example 2
Adding 29.820Kg of water into a reaction kettle, controlling the temperature to be 50 ℃, adding 45Kg of nonionic surfactant 4, and stirring; after the gemini surfactant 4 and the nonionic surfactant 4 in the reaction kettle are dissolved, 0.27Kg of organic silicon surfactant 4 and the rest 14.910Kg of water are added and stirred uniformly to obtain the light yellow transparent temperature-resistant salt-resistant efficient fracturing fluid imbibition agent.
The silicone surfactant 4 and the nonionic surfactant 4 of comparative example 2 have the following structural formulas:
the surface tension, the interfacial tension and the capillary self-absorption height under different conditions are respectively measured according to a product performance measuring method, and the results are as follows:
the test results of the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent show that if the mass concentration of other components is kept to be the same as that of the embodiment 4, the gemini surfactant 4 is not added, the interfacial tension, the surface tension and the capillary self-absorption height of the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent are attenuated to a certain degree, and particularly the surface tension index attenuation is particularly obvious. Therefore, considering that the gemini surfactant has higher efficiency in reducing the surface tension of water, the gemini surfactant can generate stronger synergistic effect when being compounded with the traditional surfactant, particularly a nonionic surfactant, and a synergistic system constructed by the gemini surfactant and the traditional surfactant can further improve the surface tension, the interfacial tension and the capillary self-absorption height of the temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent.
Examples 6 to 8
The same as example 1, except that M and M in the formula of the gemini surfactant are different:
| m | m | |
| example 6 | Ag + | 4 |
| Example 7 | Cu + | 6 |
| Example 8 | K + | 7 |
Examples 9 to 20
Substantially the same as example 1, except that R in the formula of the silicone surfactant 1 、R 2 M, n, Y are different:
examples 21 to 27
Is substantially the same as example 1 except that: substituent R in molecular formula of nonionic surfactant 3 Different, m, n are different:
| R 3 | m | n | |
| example 21 | Isobutyl radical | 1 | 1 |
| Example 22 | Sec-butyl | 1 | 1 |
| Example 23 | Pentyl radical | 1 | 1 |
| Example 24 | Tert-amyl radical | 1 | 1 |
| Example 25 | Hexyl radical | 2 | 2 |
| Example 26 | Isohexyl radical | 2 | 2 |
| Example 27 | Tert-butyl radical | 2 | 2 |
Examples 28 to 32
Substantially the same as example 1, except that: the proportions of the materials are different:
the embodiments of the present invention have been described in detail. However, the present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (8)
1. The temperature-resistant and salt-resistant efficient fracturing fluid imbibition agent is characterized by comprising the following components in percentage by mass:
30-50 wt% of a nonionic surfactant;
10-20 wt% of gemini surfactant;
0.2 to 1 weight percent of organosilicon surfactant;
the balance being water, wherein:
the organosilicon surfactant has a molecular formula as shown in formula A:
R 1 、R 2 are all C4-C9 alkyl;
m is 2 or 3;
n is 2 or 3;
y is COO - Or SO 3 2- ；
The gemini surfactant has a molecular formula shown as formula B:
m is a monovalent metal cation;
m is a positive integer, and m is more than or equal to 4 and less than or equal to 8;
the nonionic surfactant has a molecular formula as shown in formula C:
wherein R is 3 Is C4-C6 alkyl;
m is 1 or 2 or 3;
n is 1 or 2 or 3.
2. The temperature-resistant salt-resistant efficient fracturing fluid imbibition agent as claimed in claim 1, comprising:
35-45 wt% of a nonionic surfactant;
15-20 wt% of gemini surfactant;
0.3 to 0.5 weight percent of organosilicon surfactant;
the balance being water.
3. The temperature-resistant salt-resistant efficient fracturing fluid imbibition agent as claimed in claim 1, wherein R is 1 、R 2 Are all C4 alkyl groups.
4. The temperature-resistant salt-tolerant high-efficiency fracturing fluid imbibition agent as claimed in claim 1, wherein M is potassium ion or sodium ion.
5. The temperature-resistant salt-resistant efficient fracturing fluid imbibition agent as claimed in claim 1, wherein R is 3 Is C4 alkyl.
6. The preparation method of the temperature-resistant salt-resistant efficient fracturing fluid imbibition agent of claim 1, which is characterized by comprising the following steps:
(1) Measuring 1/3-3/4 of the required water amount according to the formula amount, adding the water amount into a reaction kettle, and heating to 30-60 ℃;
(2) Adding the gemini surfactant and the nonionic surfactant into the reaction kettle according to the formula ratio, stirring and dissolving, and then entering the step (3)
(3) And adding the organic silicon surfactant and the residual water in the formula amount into the reaction kettle, and uniformly stirring to obtain the temperature-resistant salt-resistant efficient fracturing fluid imbibition agent.
7. The temperature-resistant salt-resistant efficient fracturing fluid imbibition agent of any one of claims 1-5, which has a formation temperature of less than or equal to 150 ℃, a formation water mineralization of less than or equal to 19334mg/L, and a permeability of less than or equal to 50 x 10 -3 μm 2 The application in the fracturing exploitation of the ultra-low permeability reservoir.
8. The use of claim 7, wherein the temperature-resistant salt-resistant efficient fracturing fluid imbibition agent has an imbibition surface tension as low as 24.327mN/m and an interfacial tension with kerosene as low as 1.2 x 10 -3 mN/m。
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| CN106350048A (en) * | 2016-07-22 | 2017-01-25 | 北京斯迪莱铂油气技术有限公司 | Oil washing agent for oil well fracturing as well as preparation method and application of oil washing agent |
| CN111732603A (en) * | 2020-08-27 | 2020-10-02 | 山东新港化工有限公司 | Temperature-resistant and salt-resistant fracturing fluid imbibition agent and preparation method and application thereof |
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| CN106350048A (en) * | 2016-07-22 | 2017-01-25 | 北京斯迪莱铂油气技术有限公司 | Oil washing agent for oil well fracturing as well as preparation method and application of oil washing agent |
| CN111732603A (en) * | 2020-08-27 | 2020-10-02 | 山东新港化工有限公司 | Temperature-resistant and salt-resistant fracturing fluid imbibition agent and preparation method and application thereof |
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