CN113214809B - Environment-friendly profile control water plugging system, preparation method thereof and application thereof in medium-low-temperature high-water-content oil reservoir - Google Patents
Environment-friendly profile control water plugging system, preparation method thereof and application thereof in medium-low-temperature high-water-content oil reservoir Download PDFInfo
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Abstract
The invention provides an environment-friendly profile control water plugging system, a preparation method thereof and application thereof in a medium-low temperature high water content oil reservoir, and relates to the technical field of oil field exploitation. The environment-friendly profile control water shutoff system provided by the invention comprises the following preparation raw materials in percentage by mass: 0.1 to 0.6 percent of polymer monomer, 0.01 to 2 percent of cross-linking agent, 0.1 to 0.5 percent of nano material and the balance of water. The invention takes one or more of environment-friendly natural polysaccharide monomer, chitosan derivative and carboxymethyl cellulose as a cross-linking agent, and introduces nano material as a reinforcing agent. The profile control water shutoff system provided by the invention is environment-friendly, has good biocompatibility, high gel strength and good stability, has good monovalent salt resistance and divalent salt resistance, can be applied to a medium-low temperature high water content oil reservoir, and can be used for effectively performing profile control water shutoff.
Description
Technical Field
The invention relates to the technical field of oilfield exploitation, in particular to an environment-friendly profile control water plugging system, a preparation method thereof and application thereof in a medium-low-temperature high-water-content oil reservoir.
Background
At present, 70% of the petroleum output in China comes from old oil fields, and the old oil fields are developed for decades, so that the whole oil fields enter an ultra-high water content stage (the water content is up to more than 90%), and the recovery ratio is only about 35%. Aiming at the problem of high water content of the old oil field, profile control and water shutoff are effective treatment measures, and the flow diversion is realized by plugging the dominant channel, so that the water absorption profile and the liquid production profile are improved, and the swept volume and the recovery ratio are improved. The amount of the profile control water shutoff system adopted in the profile control operation of the oil well is large, and at present, the profile control water shutoff system generally consists of polymer, cross-linking agent and water and is formed byThe three-dimensional structure is used for blocking unnecessary water, wherein the polyacrylamide gel is the most common profile control and water shutoff system used at home and abroad. However, the crosslinking agents commonly used for polyacrylamide gels are metal crosslinking agents (e.g., cr 3+ Or Al 3+ Crosslinking agents) and organic crosslinking agents (such as formaldehyde, phenol or polyethyleneimine), which have a great influence on the formation due to the problems of environmental pollution and great pollution, and the application thereof is limited.
Disclosure of Invention
In view of the above, the invention aims to provide an environment-friendly profile control water shutoff system, a preparation method thereof and application thereof in a medium-low temperature high water content oil reservoir. The profile control water shutoff system provided by the invention is environment-friendly, and has high gel strength and good stability.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides an environment-friendly profile control water shutoff system, which comprises the following preparation raw materials in percentage by mass:
the polymer monomer comprises one or more of nonionic polyacrylamide, cationic polyacrylamide, acrylamide/acrylic acid copolymer, acrylamide/tert-butyl acrylate copolymer and 2-acrylamide-2-methylpropanesulfonic acid/acrylic acid copolymer;
the cross-linking agent comprises one or more of chitosan, chitosan derivatives and carboxymethyl cellulose;
the nanomaterial comprises nano SiO 2 Nano TiO 2 One or more of nano ZnO and carbon nano tubes.
Preferably, the environment-friendly profile control water shutoff system comprises the following preparation raw materials in percentage by mass:
preferably, the weight average molecular weight of the nonionic polyacrylamide is 200 to 1400 ten thousand; the weight average molecular weight of the cationic polyacrylamide is 400-1200 ten thousand, and the ionic degree is 5-25%; the weight average molecular weight of the acrylamide/acrylic acid copolymer is 500-700 ten thousand; the weight average molecular weight of the acrylamide/tert-butyl acrylate copolymer is 600 to 900 ten thousand; the weight average molecular weight of the 2-acrylamide-2-methylpropanesulfonic acid/acrylic acid copolymer is 500-800 ten thousand.
Preferably, the chitosan derivative is one or more of carboxymethyl chitosan, carboxyethyl chitosan, hydroxypropyl chitosan and n-butyl chitosan.
The invention provides a preparation method of the environment-friendly profile control water shutoff system, which comprises the following steps:
and mixing the polymer monomer, the cross-linking agent, the nano material and water to obtain the environment-friendly profile control water shutoff system.
Preferably, the mixing method is as follows:
first mixing the polymer monomer with water to obtain a polymer monomer aqueous solution;
and performing secondary mixing on the polymer monomer aqueous solution, the cross-linking agent and the nano material to obtain the environment-friendly profile control water shutoff system.
Preferably, the first mixing and the second mixing are performed under stirring conditions, and the stirring speed is 300-1000 r/min independently.
Preferably, after the first mixing, the method further comprises standing the obtained liquid; the standing time is 12-72 h.
The invention provides an environment-friendly profile control water plugging system according to the technical scheme or application of the environment-friendly profile control water plugging system prepared by the preparation method according to the technical scheme in a medium-low-temperature high-water-content oil reservoir; the method of application comprises the following steps:
injecting the environment-friendly profile control water plugging system into a middle-low temperature high water content oil reservoir stratum needing profile control water plugging, wherein the environment-friendly profile control water plugging system is crosslinked into glue at the stratum temperature, and profile control water plugging is carried out on the stratum;
the temperature of the medium-high water content oil reservoir stratum is 60-80 ℃.
Preferably, the water content of the medium-low temperature high water content oil reservoir is more than or equal to 90%.
The invention provides an environment-friendly profile control water shutoff system which comprises the following preparation raw materials in percentage by mass: 0.1 to 0.6 percent of polymer monomer, 0.01 to 2 percent of cross-linking agent, 0.1 to 0.5 percent of nano material and the balance of water; the polymer monomer comprises one or more of nonionic polyacrylamide, cationic polyacrylamide, acrylamide/acrylic acid copolymer, acrylamide/tert-butyl acrylate copolymer and 2-acrylamide-2-methylpropanesulfonic acid/acrylic acid copolymer; the cross-linking agent comprises one or more of chitosan, chitosan derivatives and carboxymethyl cellulose; the nanomaterial comprises nano SiO 2 Nano TiO 2 One or more of nano ZnO and carbon nano tubes. According to the invention, one or more of environment-friendly natural polysaccharide monomers, namely chitosan, chitosan derivatives and carboxymethyl cellulose, are used as cross-linking agents, and the natural polysaccharide monomers and polymer monomers can be subjected to physical cross-linking through intermolecular acting force or electrostatic attraction or subjected to chemical cross-linking through amide group reaction and transamidation reaction, so that a stable compact three-dimensional grid structure is formed; according to the invention, the nano material is introduced as the reinforcing agent, and the nano particles can generate crosslinking points with the polymer monomer through intermolecular force to generate more entanglement points, so that the stability of the three-dimensional grid structure is further enhanced, and the gel strength and stability of the profile control water shutoff system are improved. Therefore, the profile control water shutoff system provided by the invention is environment-friendly, has good biocompatibility, high gel strength and good stability. In addition, the polarity of the profile control water shutoff system is increased by adding the small molecular salt under low mineralization, and the electrostatic repulsive force enables the molecular chain of the natural polysaccharide monomer to be more stretched, so that the overall structural strength is higher, the viscosity of the system is increased, and the system has good salt resistance, especially monovalent salt resistance and divalent salt resistance. The profile control water shutoff system provided by the invention is applied to a medium-low temperature high water content oil reservoir, and can effectively realizeAnd (5) performing profile control and water shutoff.
The invention also provides a preparation method of the environment-friendly profile control water shutoff system, and the preparation method provided by the invention has the advantages of simple process, easiness in operation and convenience in large-scale production.
Detailed Description
The invention provides an environment-friendly profile control water shutoff system, which comprises the following preparation raw materials in percentage by mass:
the polymer monomer comprises one or more of nonionic polyacrylamide, cationic polyacrylamide, acrylamide/acrylic acid copolymer, acrylamide/tert-butyl acrylate copolymer and 2-acrylamide-2-methylpropanesulfonic acid/acrylic acid copolymer;
the cross-linking agent comprises one or more of chitosan, chitosan derivatives and carboxymethyl cellulose;
the nanomaterial comprises nano SiO 2 Nano TiO 2 One or more of nano ZnO and carbon nano tubes.
The environment-friendly profile control water shutoff system provided by the invention comprises 0.1-0.6% of polymer monomer, preferably 0.3-0.6% by mass. In the invention, the polymer monomer comprises one or more of nonionic polyacrylamide, cationic polyacrylamide, acrylamide/acrylic acid copolymer, acrylamide/tert-butyl acrylate copolymer and 2-acrylamide-2-methylpropanesulfonic acid/acrylic acid copolymer; the weight average molecular weight of the nonionic polyacrylamide is preferably 200 to 1400 ten thousand, more preferably 300 to 1200 ten thousand; the weight average molecular weight of the cationic polyacrylamide is preferably 400-1200 ten thousand, more preferably 600-1100 ten thousand, and the ionic degree is preferably 5-25%; the weight average molecular weight of the acrylamide/acrylic acid copolymer is preferably 500 to 700 tens of thousands, more preferably 550 to 650 tens of thousands; the weight average molecular weight of the acrylamide/tert-butyl acrylate copolymer is preferably 600 to 900 ten thousand, more preferably 650 to 850 ten thousand; the weight average molecular weight of the 2-acrylamide-2-methylpropanesulfonic acid/acrylic acid copolymer is preferably 500 to 800 tens of thousands, more preferably 550 to 750 tens of thousands. The present invention is not particularly limited as to the source of the polymer monomer, and can be prepared by commercial products known to those skilled in the art or by a preparation method known to those skilled in the art; in the embodiment of the invention, the nonionic polyacrylamide, the cationic polyacrylamide, the acrylamide/acrylic acid copolymer, the acrylamide/tert-butyl acrylate copolymer and the 2-acrylamide-2-methylpropanesulfonic acid/acrylic acid copolymer are all purchased from Ziboshud chemical technology Co.
The environment-friendly profile control water shutoff system provided by the invention comprises 0.01-2% of cross-linking agent, preferably 0.4-2% by mass. In the invention, the cross-linking agent comprises one or more of chitosan, chitosan derivatives and carboxymethyl cellulose, wherein the chitosan derivatives are preferably one or more of carboxymethyl chitosan, carboxyethyl chitosan, hydroxypropyl chitosan and n-butyl chitosan; the source of the crosslinking agent is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used. In the invention, the chitosan derivative and the carboxymethyl cellulose are natural polysaccharide monomers, and the natural polysaccharide monomers are used as the cross-linking agent, so that the obtained profile control water shutoff system is green and environment-friendly, and has good biocompatibility.
The environment-friendly profile control water shutoff system provided by the invention comprises 0.1-0.5% of nano materials, preferably 0.3-0.5% of nano materials by mass percent. In the present invention, the nanomaterial includes nano SiO 2 Nano TiO 2 One or more of nano ZnO and carbon nano tubes; the source of the nanomaterial is not particularly required in the invention, and the corresponding materials of which the source is well known to the person skilled in the art can be adopted. In the present invention, the nano SiO 2 Preferably hydrophilic nano SiO 2 Or hydrophobic nano SiO 2 The method comprises the steps of carrying out a first treatment on the surface of the Hydrophilic nano SiO 2 Such as A150 nm SiO 2 V15 nano SiO 2 The hydrophobic nano SiO 2 For example, R972 nano SiO 2 XZ-G02 nano SiO 2 . In the present invention, the nano TiO 2 Preferably hydrophilic nano TiO 2 Or hydrophobic nano TiO 2 The method comprises the steps of carrying out a first treatment on the surface of the The hydrophilic nano TiO 2 Such as P25 nano TiO 2 vK-T06H nano TiO 2 The hydrophobic nano TiO 2 Such as VK-T06S nano TiO 2 VK-T25 nano TiO 2 . In the present invention, the nano ZnO is preferably hydrophilic nano ZnO; the hydrophilic nanometer ZnO is PZT-15 nanometer ZnO or PZT-30 nanometer ZnO. In the present invention, the carbon nanotubes such as CNT-10 carbon nanotubes. The nano material has excellent stability, and the nano material is used as a reinforcing agent.
The environment-friendly profile control water shutoff system provided by the invention comprises the balance of water in terms of mass percent. The present invention is not particularly limited to the above water, and water known to those skilled in the art may be used.
According to the invention, one or more of environment-friendly natural polysaccharide monomers, namely chitosan, chitosan derivatives and carboxymethyl cellulose, are used as cross-linking agents, and the natural polysaccharide monomers and polymer monomers can be subjected to physical cross-linking through intermolecular acting force or electrostatic attraction or subjected to chemical cross-linking through amide group reaction and transamidation reaction, so that a stable compact three-dimensional grid structure is formed; according to the invention, the nano material is introduced as the reinforcing agent, and the nano particles can generate crosslinking points with the polymer monomer through intermolecular force to generate more entanglement points, so that the stability of the three-dimensional grid structure is further enhanced, and the gel strength and stability of the profile control water shutoff system are improved. Therefore, the profile control water shutoff system provided by the invention is environment-friendly, has good biocompatibility, high gel strength and good stability; and has good monovalent salt resistance and divalent salt resistance.
The invention provides a preparation method of the environment-friendly profile control water shutoff system, which comprises the following steps:
and mixing the polymer monomer, the cross-linking agent, the nano material and water to obtain the environment-friendly profile control water shutoff system.
In the present invention, the mixing method is preferably:
first mixing the polymer monomer with water to obtain a polymer monomer aqueous solution;
and carrying out second mixing on the polymer monomer aqueous solution, the cross-linking agent and the nano material to obtain polymer nano dispersion liquid.
In the present invention, the first mixing is preferably performed under stirring, and the stirring speed is preferably 300 to 1000r/min; the present invention has no particular requirement on the time of the first mixing, and can ensure that the polymer monomer is sufficiently dissolved in water. After the first mixing, the present invention also preferably provides for the resulting liquid to be left to stand; the standing time is preferably 12 to 72 hours, more preferably 24 to 48 hours; the obtained liquid is kept stand for a certain time for aging, so that the polymer monomer in the liquid is fully hydrolyzed, and the polymer monomer aqueous solution is obtained after the standing. The invention preferably adds the cross-linking agent and the nanometer material into the polymer monomer aqueous solution in turn to carry out second mixing; the second mixing is preferably carried out under stirring, and the stirring speed is preferably 300-1000 r/min; the invention has no special requirement on the second mixing time, and is based on the fact that a uniform profile control water shutoff system can be formed.
The preparation method of the environment-friendly profile control water shutoff system provided by the invention has the advantages of simple process, easiness in operation and convenience in large-scale production.
The invention provides the application of the environment-friendly profile control water shutoff system in the oil reservoir with high water content in the middle and high water content; the method of application comprises the following steps:
injecting the environment-friendly profile control water plugging system into a medium-low temperature high water content oil reservoir stratum needing profile control water plugging, and crosslinking the environment-friendly profile control water plugging system into glue at the stratum temperature to perform profile control water plugging on the stratum.
In the invention, the temperature of the stratum of the medium-low temperature high water-containing oil reservoir is 60-80 ℃, and the water content of the medium-low temperature high water-containing oil reservoir is preferably more than or equal to 90%; the environment-friendly profile control water plugging system starts to gel after crosslinking for 2 h-5 d at the stratum temperature, and the gel strength of crosslinking for 2 d-20 d reaches the maximum.
The profile control water shutoff system provided by the invention is environment-friendly, has good biocompatibility, high gel strength and good stability; in addition, the water plugging agent has good monovalent salt resistance and divalent salt resistance, can be applied to a medium-low temperature high water content oil reservoir, and can effectively perform profile control and water plugging.
The environment-friendly profile control water shutoff system, the preparation method thereof and the application thereof in the medium-low temperature high water content oil reservoir are described in detail below by combining with the examples, but the environment-friendly profile control water shutoff system and the preparation method are not to be construed as limiting the protection scope of the invention.
In various embodiments, the cross-linking condition of the profile control water shutoff system at the stratum temperature is simulated by reacting the profile control water shutoff system in a water bath at 60-80 ℃.
According to the invention, the gel forming time and the gel forming strength of the polymer gel are measured by adopting a gel code method, the gel forming time is recorded when the gel strength reaches D, and the final gel forming time is recorded when the gel strength reaches I. Gel strength code characterization is shown in table 1:
table 1 gel strength code characterization
Example 1
The environment-friendly profile control water shutoff system is prepared by the following steps:
weighing 0.1g of nonionic polyacrylamide (PAM, weight average molecular weight is 200-1400 ten thousand), dissolving the nonionic polyacrylamide into 99.79g of fresh water under the condition of 500r/min by using an electric stirrer, and standing for 24 hours after dissolving to obtain a polyacrylamide aqueous solution;
0.01g of the aqueous solution of polyacrylamide is added in sequence under the stirring condition of 500r/minCarboxymethyl chitosan (CMCS) and 0.1g of A150 nano SiO 2 Forming a uniform profile control water shutoff system;
sealing the obtained profile control water shutoff system, respectively placing the system in a 60 ℃, 70 ℃ and 80 ℃ constant-temperature water bath kettle for crosslinking reaction, and the gel forming condition is shown in table 2:
table 2 0.1%PAM+0.01%CMCS+0.1%A150-SiO 2 Gel formation at different temperatures
(in Table 2: "X" indicates that no glue is formed)
As can be seen from Table 2, the formulation was 0.1% PAM+0.01% CMCS+0.1% A150-SiO 2 The cross-linking reaction speed is continuously accelerated along with the rise of the temperature of the profile control water shutoff system, the gel strength reaches the maximum within 3 days and 10 days at 80 ℃, but the dehydration phenomenon occurs during 20 days along with the extension of the aging time. This shows that the gel strength of the profile control water shutoff system of the formula can reach the H level at 80 ℃.
Example 2
The environment-friendly profile control water shutoff system is prepared by the following steps:
weighing 0.3g of nonionic polyacrylamide (PAM, weight average molecular weight is 200-1400 ten thousand), dissolving the nonionic polyacrylamide into 98.4g of fresh water under the condition of 500r/min by using an electric stirrer, and standing for 24 hours after dissolving to obtain a polyacrylamide aqueous solution;
adding 1g carboxymethyl chitosan (CMCS) and 0.3g R972 nano SiO in turn into polyacrylamide water solution under the stirring condition of 500r/min 2 Forming a uniform profile control water shutoff system;
sealing the obtained profile control water shutoff system, respectively placing the system in a 60 ℃, 70 ℃ and 80 ℃ constant-temperature water bath kettle for crosslinking reaction, and the gel forming condition is shown in table 3:
table 3 0.3%PAM+1%CMCS+0.3%R972-SiO 2 Gel formation at different temperatures
(note in Table 3: "x" indicates that no glue is formed)
As can be seen from Table 3, the formulation was 0.3% PAM+1% CMCS+0.3% R972-SiO 2 The cross-linking reaction speed is continuously accelerated along with the temperature rise of the profile control water shutoff system, the cross-linking reaction starts to occur within 12 hours at 80 ℃, the gel strength reaches the maximum within 5 days, but the dehydration phenomenon occurs along with the aging time extension at 20 days. This indicates that the gel strength of the profile control water shutoff system of the formulation reaches the maximum H level at 5 d.
Example 3
The environment-friendly profile control water shutoff system is prepared by the following steps:
weighing 0.6g of nonionic polyacrylamide (PAM, weight average molecular weight is 200-1400 ten thousand), dissolving the nonionic polyacrylamide into 96.9g of fresh water under the condition of 500r/min by using an electric stirrer, and standing for 24 hours after dissolving to obtain a polyacrylamide aqueous solution;
2g of carboxymethyl chitosan (CMCS) and 0.5g of R972 nano SiO are added into the polyacrylamide aqueous solution in sequence under the stirring condition of 500r/min 2 Forming a uniform profile control water shutoff system;
sealing the obtained profile control water shutoff system, respectively placing the system in a 60 ℃, 70 ℃ and 80 ℃ constant-temperature water bath kettle for crosslinking reaction, and the gel forming condition is shown in table 4:
table 4 0.6%PAM+2%CMCS+0.5%R972-SiO 2 Gel formation at different temperatures
(note in Table 4: "x" indicates that no glue is formed)
As can be seen from Table 4, the formulation was 0.6% PAM+2% CMCS+0.5% R972-SiO 2 The cross-linking reaction speed is continuously accelerated along with the temperature rise of the profile control water shutoff system, the cross-linking reaction starts to occur within 10 hours at 80 ℃, the gel strength within 2 days reaches the maximum grade I, and the dehydration phenomenon does not occur within 30 days along with the aging time extension. This shows that the profile control and water shutoff system of the formulaHas good long-term stability and strength under high temperature condition.
Example 4
The environment-friendly profile control water shutoff system is prepared by the following steps:
weighing 0.6g of nonionic polyacrylamide (PAM, weight average molecular weight is 200-1400 ten thousand), dissolving the nonionic polyacrylamide into 98.7g of fresh water under the condition of 500r/min by using an electric stirrer, and standing for 24 hours after dissolving to obtain a polyacrylamide aqueous solution;
adding 0.4g carboxymethyl chitosan (CMCS) and 0.3g V15 nano SiO in turn into polyacrylamide water solution under the stirring condition of 500r/min 2 Forming a uniform profile control water shutoff system;
sealing the obtained profile control water shutoff system, and respectively placing the system in a 60 ℃, 70 ℃ and 80 ℃ constant-temperature water bath kettle for crosslinking reaction, wherein the gel forming condition is shown in table 5:
table 5 0.6%PAM+0.4%CMCS+0.3%V15-SiO 2 Gel formation at different temperatures
(note in Table 5: "x" indicates that no glue was formed)
As can be seen from Table 5, the formulation was 0.6% PAM+0.4% CMCS+0.3% V15-SiO 2 The cross-linking reaction speed is continuously accelerated along with the temperature rise of the profile control water shutoff system, the cross-linking reaction starts to occur within 2 hours at the temperature of 80 ℃, the gel strength within 3 days reaches the maximum grade I, and the dehydration phenomenon does not occur within 30 days along with the aging time extension. This shows that the water shutoff agent prepared by the formula has good long-term stability and strength under high temperature condition.
Example 5
Testing the monovalent salt resistance of an environment-friendly profile control water shutoff system:
weighing 0.6g of nonionic polyacrylamide (PAM, weight average molecular weight is 200-1400 ten thousand), dissolving the nonionic polyacrylamide into 98.7g of NaCl aqueous solution (NaCl concentration: 5000-70000 mg/L) under the condition of 500r/min by using an electric stirrer, and standing for 24 hours after dissolving to obtain the polyacrylamide aqueous solution;
adding 0.4g of carboxymethyl chitosan (CMCS) and 0.3g of A150 nano SiO in turn into the polyacrylamide aqueous solution under the stirring condition of 500r/min 2 Forming a uniform profile control water shutoff system;
sealing the profile control water shutoff system, respectively placing the profile control water shutoff system and the profile control water shutoff system in a constant-temperature water bath kettle at 80 ℃ for crosslinking reaction, wherein the gel forming conditions are shown in table 6:
table 6 0.6%PAM+0.4%CMCS+0.3%A150-SiO 2 Gel formation of +NaCl at 80 ℃C
(in Table 6: "X" indicates that no glue is formed)
As can be seen from Table 6, the formulation was 0.6% PAM+0.4% CMCS+0.3% SiO 2 The cross-linking reaction speed is reduced in 5000-70000 mg/L NaCl solution at 80 ℃, and the maximum strength of the gel is not changed when NaCl is less than or equal to 30000mg/L and still can reach the I level; when NaCl is more than 30000mg/L, the maximum gel strength in 30d can reach grade H. Therefore, the profile control water plugging system prepared by the invention has better monovalent salt resistance.
Example 6
Testing the bivalent salt resistance of an environment-friendly profile control water shutoff system:
weighing 0.6g of nonionic polyacrylamide (PAM, weight average molecular weight is 200-1400 ten thousand), and dissolving in 98.7g CaCl under 500r/min with an electric stirrer 2 Aqueous solution (CaCl) 2 Concentration: 1000-7000 mg/L), standing for 24 hours after dissolution to obtain a polyacrylamide aqueous solution;
adding 0.4g of carboxymethyl chitosan (CMCS) and 0.3g of A150 nano SiO in turn into the polyacrylamide aqueous solution under the stirring condition of 500r/min 2 Forming a uniform profile control water shutoff system;
sealing the profile control water shutoff system, respectively placing the profile control water shutoff system and the profile control water shutoff system in a constant-temperature water bath kettle at 80 ℃ for crosslinking reaction, wherein the gel forming conditions are shown in table 7:
table 7 0.6%PAM+0.4%CMCS+0.3%A150-SiO 2 +CaCl 2 Gel formation at 80 DEG C
As can be seen from Table 7, the formulation was 0.6% PAM+0.4% CMCS+0.3% SiO 2 The profile control and water shutoff system is 1000-7000 mg/L CaCl 2 In the solution, the crosslinking reaction speed is reduced at 80 ℃, but the maximum strength of the gel is not changed, and the strength within 30d can still be maintained at the level I; when NaCl and CaCl 2 When the concentration of the water is 5000mg/L, the profile control and water shutoff system starts to react in NaCl for about 12 hours, and CaCl is used for preparing the water 2 About 6 hours in the course of the reaction, indicating that the water shutoff agent resists CaCl in low concentration brine 2 Is more resistant to NaCl than it is to NaCl. Therefore, the profile control water plugging system prepared by the invention has good bivalent salt resistance.
Example 7
Testing the monovalent salt resistance of an environment-friendly profile control water shutoff system:
weighing 0.6g of cationic polyacrylamide (CPAM, weight average molecular weight of 400-1200 ten thousand and ionic degree of 5-25%), dissolving in 98.9g of NaCl aqueous solution (NaCl concentration: 5000-70000 mg/L) under the condition of 500r/min by using an electric stirrer, and standing for 24 hours after dissolving to obtain cationic polyacrylamide aqueous solution;
adding 0.4g of carboxymethyl cellulose (CMC) and 0.1gVK-T25 nano TiO into the cationic polyacrylamide aqueous solution in turn under the stirring condition of 500r/min 2 Forming a uniform profile control water shutoff system;
sealing the profile control water shutoff system, respectively placing the profile control water shutoff system and the profile control water shutoff system in a constant-temperature water bath kettle at 80 ℃ for crosslinking reaction, wherein the gel forming conditions are shown in table 8:
table 8 0.6%CPAM+0.4%CMC+0.1%VK-T25 TiO 2 Gel formation of +NaCl at 80 ℃C
(note in Table 8: "X" indicates that no glue was formed)
As can be seen from Table 8, the formulation was 0.6% CPAM+0.4% CMC+0.1% TiO 2 The cross-linking reaction speed is reduced in 5000-70000 mg/L NaCl solution at 80 ℃, and the maximum strength of the gel is not changed when NaCl is less than or equal to 30000mg/L and still can reach the I level; when NaCl is more than 30000mg/L, the maximum gel strength in 30d can reach grade H, and the better monovalent salt resistance stability is shown.
Example 8
Testing the bivalent salt resistance of an environment-friendly profile control water shutoff system:
0.1g of 2-acrylamido-2-methylpropanesulfonic acid/acrylic acid copolymer (AA/AMPS, weight average molecular weight 500 to 800 tens of thousands) was weighed and dissolved in 99.6g CaCl at 500r/min using an electric stirrer 2 Aqueous solution (CaCl) 2 Concentration: 1000-7000 mg/L), standing for 24 hours after dissolution is finished, and obtaining cationic polyacrylamide aqueous solution;
under the stirring condition of 500r/min, 0.2g of Chitosan (CS) and 0.1g of PZT-15 nano ZnO are sequentially added into the 2-acrylamide-2-methylpropanesulfonic acid/acrylic acid copolymer aqueous solution to form a uniform profile control water shutoff system;
sealing the profile control water shutoff system, and respectively placing the profile control water shutoff system and the profile control water shutoff system in a constant-temperature water bath kettle at 80 ℃ for crosslinking reaction, wherein the gel forming conditions are shown in table 9:
TABLE 9 0.1% AA/AMPS+0.2% CS+0.1% PZT-15 nano ZnO+CaCl 2 Gel formation at 80 DEG C
(note in Table 9: "x" indicates that no glue was formed)
As can be seen from Table 9, the profile control water shutoff system with the formula of 0.1% AA/AMPS+0.4% CS+0.1% PZT-15 nano ZnO is 1000-7000 mg/L CaCl 2 In the solution, the maximum strength of the gel is not changed within 30 days at 80 ℃, the strength can still be kept at the H level, and the salt resistance stability is better.
The embodiment shows that the profile control water shutoff system provided by the invention is environment-friendly, high in strength and good in stability; and has good monovalent salt resistance and divalent salt resistance.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (10)
1. The environment-friendly profile control water plugging system applied to the medium-low temperature high water content oil reservoir is characterized by comprising the following preparation raw materials in percentage by mass:
0.1 to 0.6% of polymer,
0.01-2% of cross-linking agent,
0.1 to 0.5 percent of nano material,
the balance of water;
the polymer is one or more of nonionic polyacrylamide PAM, cationic polyacrylamide, acrylamide/acrylic acid copolymer, acrylamide/tert-butyl acrylate copolymer and 2-acrylamide-2-methylpropanesulfonic acid/acrylic acid copolymer;
the cross-linking agent is one or more of chitosan, chitosan derivatives and carboxymethyl cellulose;
the nano material is nano SiO 2 One or more of nano ZnO and carbon nano tubes;
the temperature of the medium-high water content oil reservoir stratum is 60-80 ℃.
2. The environment-friendly profile control water shutoff system as claimed in claim 1, which is characterized by comprising the following preparation raw materials in percentage by mass:
0.3 to 0.6% of polymer,
0.4-2% of cross-linking agent,
0.3 to 0.5 percent of nano material,
the balance of water.
3. The environment-friendly profile control and water shutoff system according to claim 1 or 2, wherein the weight average molecular weight of the nonionic polyacrylamide PAM is 200-1400 ten thousand; the weight average molecular weight of the cationic polyacrylamide is 400-1200 ten thousand, and the ionic degree is 5-25%; the weight average molecular weight of the acrylamide/acrylic acid copolymer is 500-700 ten thousand; the weight average molecular weight of the acrylamide/tert-butyl acrylate copolymer is 600 to 900 ten thousand; the weight average molecular weight of the 2-acrylamide-2-methylpropanesulfonic acid/acrylic acid copolymer is 500-800 ten thousand.
4. The environment-friendly profile control and water shutoff system according to claim 1 or 2, wherein the chitosan derivative is one or more of carboxymethyl chitosan, carboxyethyl chitosan, hydroxypropyl chitosan and n-butyl chitosan.
5. The method for preparing the environment-friendly profile control water shutoff system as claimed in any one of claims 1 to 4, which is characterized by comprising the following steps:
and mixing the polymer, the cross-linking agent, the nano material and water to obtain the environment-friendly profile control water plugging system.
6. The method of claim 5, wherein the mixing is performed by:
first mixing the polymer with water to obtain a polymer aqueous solution;
and (3) performing second mixing on the polymer aqueous solution, the cross-linking agent and the nano material to obtain the environment-friendly profile control water shutoff system.
7. The method according to claim 6, wherein the first mixing and the second mixing are performed under stirring conditions, and the stirring speed is 300 to 1000r/min independently.
8. The method according to claim 6 or 7, wherein after the first mixing, further comprising standing the obtained liquid; the standing time is 12-72 h.
9. An application of the environment-friendly profile control and water shutoff system according to any one of claims 1 to 4 or the environment-friendly profile control and water shutoff system prepared by the preparation method according to any one of claims 5 to 8 in a medium-low temperature high water content oil reservoir, wherein the application method comprises the following steps:
injecting the environment-friendly profile control water plugging system into a middle-low temperature high water content oil reservoir stratum needing profile control water plugging, wherein the environment-friendly profile control water plugging system is crosslinked into glue at the stratum temperature, and profile control water plugging is carried out on the stratum;
the temperature of the medium-high water content oil reservoir stratum is 60-80 ℃.
10. The use according to claim 9, wherein the water content of the medium-low temperature high water reservoir is not less than 90%.
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| CN113755144B (en) * | 2021-08-31 | 2023-03-10 | 中国石油大学(北京) | Gel water shutoff agent and preparation method thereof |
| CN113831904B (en) * | 2021-11-03 | 2023-01-31 | 中海油田服务股份有限公司 | Carbon nanotube reinforced temperature-resistant gel plugging agent and preparation method and application thereof |
| CN114163984A (en) * | 2021-12-13 | 2022-03-11 | 西南石油大学 | Selection of selective water shutoff agent for oil well and water shutoff method |
| CN114854381A (en) * | 2022-05-19 | 2022-08-05 | 长江大学 | Weak-gel profile-control water shutoff agent with salt resistance and adjustable strength as well as preparation and application thereof |
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