CN109852352B - Organic phosphonic acid polymer fluid loss agent and preparation method and application thereof - Google Patents
Organic phosphonic acid polymer fluid loss agent and preparation method and application thereof Download PDFInfo
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Abstract
The application provides an organic phosphonic acid polymer fluid loss agent, a preparation method and an application thereof, wherein the preparation method comprises the following steps: carrying out polymerization reaction on an isopropenylphosphonic acid monomer, an acrylamide monomer and a monomer containing carboxylic acid groups under the action of an initiator to obtain an organic phosphonic acid polymer fluid loss agent; the acrylamide monomer is selected from acrylamide, 2-methacrylamide, N-ethylacrylamide or N, N-dimethylacrylamide; the carboxylic acid group containing monomer is selected from acrylic acid or 2-methacrylic acid. The organic phosphonic acid polymer fluid loss agent provided by the invention comprises: the first repeating unit with the structure of formula 1, the second repeating unit with the structure of formula 2 and the third repeating unit with the structure of formula 3 can be used for preparing drilling fluid; the high-salt drilling fluid has better salt resistance, can be well suitable for a high-salt drilling fluid system, and is simple and convenient to prepare.
Formula 1
Formula 2
Description
Technical Field
The invention belongs to the technical field of oilfield chemical drilling fluid treatment agents, relates to a drilling fluid loss agent and a preparation method thereof, and particularly relates to an organic phosphonic acid polymer fluid loss agent and a preparation method and application thereof.
Background
In recent years, with the wide development region of oil and gas exploration, the developed oil and gas layer positions are deeper and deeper, and the geological conditions are more and more complex, which provides a new challenge for the development of the drilling fluid treating agent. The drilling fluid filtrate reducer is one of the largest treating agents in the drilling process, occupies a core position in all the drilling fluid treating agents, and plays an important role in maintaining stable performance of the drilling fluid and safely and efficiently drilling.
In order to reduce the filtration loss of the drilling fluid into the stratum, ensure the performance of the drilling fluid and stabilize the chemicals used by the well wall, namely a filtrate reducer or a filtrate reducer. In the seventh and eighty years of the last century, high-temperature-resistant medium molecular weight polyacrylate fluid loss additives are developed abroad, and the polyacrylate has good thermal stability, but has poor tolerance to high-valence ions when used as the fluid loss additives.
Subsequently, polymer filtrate reducers with high temperature and calcium salt resistance characteristics, which are multipolymers using vinyl sulfonic acid monomers such as 2-acrylamide-2-methylpropanesulfonic Acid (AMPS) and taking acrylamide, alkyl acrylamide, vinyl vinylamide and the like as monomers, are developed at home and abroad successively. The structure of the polymer fluid loss additive generally comprises: n-vinyl-2-pyrrolidone, 2-acrylamide-2-methylpropanesulfonic acid and other functional monomers show good polymerization activity and stability. However, in complex operation blocks such as high-salt calcium and the like, the defects are still shown, and the water loss reduction performance index is difficult to meet the construction requirement.
Disclosure of Invention
In view of the above, the application provides an organic phosphonic acid polymer fluid loss agent, and a preparation method and an application thereof.
The invention provides an organic phosphonic acid polymer fluid loss agent, which comprises a first repeating unit with a structure shown in a formula 1, a second repeating unit with a structure shown in a formula 2 and a third repeating unit with a structure shown in a formula 3:
in the formula 1, R1Selected from hydrogen or methyl; in the formula 2, R2And R3Independently selected from hydrogen, methyl or ethyl; the molar ratio of the first repeating unit to the second repeating unit to the third repeating unit is (0.05-0.55): (0.2-0.8): (0.1-0.5).
Preferably, the pH value of the organic phosphonic acid polymer fluid loss agent is 7.5-8.5.
The invention provides a preparation method of an organic phosphonic acid polymer fluid loss agent, which comprises the following steps:
carrying out polymerization reaction on an isopropenylphosphoric acid monomer, an acrylamide monomer and a monomer containing carboxylic acid groups under the action of an initiator to obtain an organic phosphonic acid polymer fluid loss agent;
the acrylamide monomer is selected from acrylamide, 2-methacrylamide, N-ethylacrylamide or N, N-dimethylacrylamide; the carboxylic acid group containing monomer is selected from acrylic acid or 2-methacrylic acid.
Preferably, the mole ratio of the isopropenylphosphonic acid monomer, the acrylamide monomer and the carboxylic acid group-containing monomer is (0.1-0.5): (0.2-0.8): (0.05-0.55).
Preferably, the polymerization is carried out in water under the action of an initiator selected from ammonium persulfate or potassium persulfate.
Preferably, the mass of the initiator is 0.1-1.0% of the total mass of the isopropenylphosphonic acid monomer, the acrylamide monomer and the carboxylic acid group-containing monomer.
Preferably, the preparation method specifically comprises the following steps:
mixing an isopropenylphosphonic acid monomer, an acrylamide monomer and a monomer containing carboxylic acid groups, and dissolving in water to obtain a monomer aqueous solution;
and heating the monomer aqueous solution, mixing the monomer aqueous solution with an initiator aqueous solution, carrying out polymerization reaction, and neutralizing a system until the pH value is 7.5-8.5 after the reaction is finished to obtain the organic phosphonic acid polymer fluid loss agent.
Preferably, the temperature of the polymerization reaction is 80-100 ℃ and the time is 1-6 hours.
Preferably, the polymerization is carried out in the presence of a shielding gas, which is argon.
The invention also provides the application of the organic phosphonic acid polymer fluid loss additive in the preparation of drilling fluid.
Compared with the prior art, the invention provides an organic phosphonic acid polymer fluid loss agent, which comprises a first repeating unit shown as a formula 1, a second repeating unit shown as a formula 2 and a third repeating unit shown as a formula 3. In the molecular structure of the organic phosphonic acid polymer fluid loss agent, the complexation capacity of phosphonic acid groups and calcium ions is strong, so that the product has strong calcium resistance and better applicability to a high-salt drilling fluid system.
In addition, the organic phosphonic acid polymer fluid loss agent is simple and convenient to prepare and suitable for industrial popularization and application.
Drawings
FIG. 1 shows the structural characterization results of the product obtained in example 1 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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 invention provides an organic phosphonic acid polymer fluid loss agent, which comprises a first repeating unit with a structure shown in a formula 1, a second repeating unit with a structure shown in a formula 2 and a third repeating unit with a structure shown in a formula 3:
in the formula 1, R1Selected from hydrogen or methyl; in the formula 2, R2And R3Independently selected from hydrogen, methyl or ethyl; the molar ratio of the first repeating unit to the second repeating unit to the third repeating unit is (0.05-0.55): (0.2-0.8): (0.1-0.5).
The polymer fluid loss agent provided by the invention has better salt resistance, and can overcome the problems that the existing fluid loss agent for drilling fluid has weak stability and poor salt resistance in a high-calcium system and cannot be well suitable for a high-salt drilling fluid system.
The molecular structure of the polymer fluid loss agent provided by the invention comprises: a first repeat unit having the structure of formula 1 and a second repeat unit having the structure of formula 2. The structure of the formula 1 contains carboxylic acid groups (-COOH); in the formula 1, R1Selected from hydrogen (H) or methyl (CH)3). In the formula 2, R2And R3Independently selected from hydrogen (H), methyl (CH)3) Or ethyl (CH)2CH3)。
The polymer fluid loss agent provided by the invention comprises a third repeating unit with a structure shown in a formula 3, wherein the structure shown in the formula 3 comprises phosphorus-oxygen double bonds (P ═ O) and C-P bonds, and the structure can be formed by organic phosphonic acid. The organic phosphonic acid is generally an organic phosphonic acid having a P-C bond structure, which is a strong electron ligand having a phosphorus-oxygen double bond (P ═ O), and can react with Ca2+、Mg2+、Al3+The plasma forms a strong chelating structure which is not easy to damage at high temperature, and the organic phosphonate generally has good water solubility, can be prevented from being separated out in aqueous solution to a great extent, thereby improving the tolerance of the drilling fluid treating agent to high-valence metal ions. Secondly, compared with inorganic phosphoric acid, the organic phosphonic acid group is directly connected with the main chain or the side chain of the macromolecule by a C-P bond, thereby overcoming the defects of strong corrosivity and easy loss of the inorganic phosphoric acid. Compared with the sulfonic acid monomer commonly used in the drilling fluid treating agent, the organic phosphonic acid monomer has stronger C-P bond than C-S bond, and the strength of the organic phosphonic acid monomer is at least equivalent to that of the C-C bond. Furthermore, the C-P bond has a very strong resistance to oxidation and hydrolysis, in this respect even in comparison with C-CThe bond is more stable. Therefore, in the molecular structure of the organic phosphonic acid polymer fluid loss agent, the complexation capacity of phosphonic acid groups and calcium ions is stronger, and the product has stronger calcium resistance.
In the present invention, the molar ratio of the first repeating unit, the second repeating unit and the third repeating unit is (0.05 to 0.55): (0.2-0.8): (0.1-0.5). In embodiments of the present invention, the organic phosphonic acid polymer fluid loss additive may have the structural formula:
in formula 4, m, n, and o are the number of moles of the repeating unit, respectively, and m: n: o ═ 0.05 to 0.55: (0.2-0.8): (0.1-0.5). The present invention is not particularly limited to the connection method between the repeating units. In some embodiments of the present invention, the pH of the fluid loss additive may be 7.5-8.5, for example, pH 8.
Meanwhile, the invention provides a preparation method of the organic phosphonic acid polymer fluid loss agent, which comprises the following steps: carrying out polymerization reaction on an isopropenylphosphonic acid monomer, an acrylamide monomer and a monomer containing carboxylic acid groups under the action of an initiator to obtain an organic phosphonic acid polymer fluid loss agent;
the acrylamide monomer is selected from acrylamide, 2-methacrylamide, N-ethylacrylamide or N, N-dimethylacrylamide; the carboxylic acid group containing monomer is selected from acrylic acid or 2-methacrylic acid.
The invention is based on that an isopropenylphosphonic acid (IPPA) monomer is subjected to polymerization reaction to form an organic phosphonic acid high polymer material. Specifically, the method takes isopropenylphosphonic acid, an acrylamide compound and a compound containing carboxylic acid groups as monomers to carry out polymerization reaction. Wherein the acrylamide monomer is selected from acrylamide, 2-methacrylamide, N-ethylacrylamide or N, N-dimethylacrylamide; the carboxylic acid group containing monomer is selected from acrylic acid or 2-methacrylic acid. In the present invention, the molar ratio of the isopropenylphosphonic acid monomer, the acrylamide-based monomer and the carboxylic acid group-containing monomer (i.e., the ratio of the amount of substance n) is preferably (0.1 to 0.5): (0.2-0.8): (0.05-0.55); can also be expressed as 10% to 50%: 20% -80%: 5 to 55 percent. The amount of substance used here is taken as a uniform unit; after initiation of the polymerization, mixtures of different molecular weight ranges are obtained.
The polymerization reaction is carried out under the action of an initiator, and the initiator is preferably ammonium persulfate or potassium persulfate. Preferably, the mass of the initiator added is 0.1-1.0% of the total mass of the isopropenylphosphonic acid monomer, the acrylamide monomer and the carboxylic acid group-containing monomer, and more preferably 0.15-0.9%.
In a preferred embodiment of the present invention, the solvent for the polymerization reaction is water. The polymerization is preferably carried out in the presence of a protective gas, which may be argon. The polymerization reaction is preferably carried out at a temperature of 80 ℃ to 100 ℃ for 1 hour to 6 hours.
The present invention has no particular limitation on the order of addition of the reaction; the preparation method preferably comprises the following steps: mixing an isopropenylphosphonic acid monomer, an acrylamide monomer and a monomer containing carboxylic acid groups, and dissolving in water to obtain a monomer (mixture) aqueous solution; and mixing the monomer aqueous solution with an initiator aqueous solution, and carrying out polymerization reaction to obtain the organic phosphonic acid polymer fluid loss agent.
The embodiment of the invention mixes the three monomers according to the mass proportion of the substances, and dissolves the obtained monomer mixture in water to prepare the monomer aqueous solution with the mass fraction of 10-50%. And preparing 2.0% of initiator aqueous solution by 0.1-1.0% of initiator accounting for the total mass of the monomer mixture. According to the embodiment of the invention, the monomer mixture solution can be added into the reaction kettle, the air in the argon gas evacuation system is introduced, and the temperature is raised to the initial temperature. In the embodiment of the invention, the monomer aqueous solution is heated, preferably to 50-80 ℃, and then the initiator aqueous solution is added; the initiator aqueous solution is added into the reaction kettle in batches, and the adding speed is subject to the condition that the temperature of the reaction kettle does not exceed 90 ℃. After the initiator aqueous solution is added, the temperature of the system is raised to 80-100 ℃ for reaction for 1-6 hours.
After the reaction is finished, the system can be neutralized by alkali until the pH value is 7.5-8.5, and the obtained product is dried and crushed to obtain the drilling fluid loss agent. According to the embodiment of the invention, the organic phosphonic acid polymer fluid loss agent is prepared by controlling the proportion of groups, reaction conditions and the like, and can meet the drilling construction requirements of high-salinity calcium stratum.
In addition, the invention also provides the application of the organic phosphonic acid polymer fluid loss agent in the preparation of drilling fluid.
The method comprises the steps of adding a certain amount of synthesized polymer into base slurry, stirring at a high speed for 5min, placing for 6h, rolling and aging in a high-temperature roller furnace at 120 ℃ and 135 ℃ for 16h, taking out, cooling to room temperature, stirring at a high speed for 5min, and measuring the medium-pressure filtration loss of the drilling fluid at room temperature, at 24 ℃ +/-3 ℃ and under 690KPa according to the regulation of GB/T16783.1-20067.2. Wherein, the base slurry can be composite saline water slurry conventional in the field; while the amount of polymer synthesized may be 1% to 2% (the "addition" concept is well known to those skilled in the art). In addition, the invention has no special limitation on the types, the adding amount and the like of other treating agents in the prepared drilling fluid.
According to the determination result, the fluid loss additive for the organic phosphonic acid polymer drilling fluid shows remarkable fluid loss reducing effect after aging at 120 ℃/16h and 135 ℃/16h in the composite salt water drilling fluid, and has excellent calcium resistance.
For further understanding of the present application, the organic phosphonic acid polymer fluid loss additive provided by the present application, and the preparation method and application thereof are specifically described below with reference to examples.
Example 1
Isopropenylphosphonic acid (IPPA), Acrylamide (AM) and Acrylic Acid (AA) are mixed according to the mass ratio of 10%: 70%: mixing 20% of the mixture to prepare a monomer mixture aqueous solution with the mass fraction of 30%; potassium persulfate accounting for 0.3 percent of the total mass of the monomer mixture is prepared into an initiator aqueous solution with the concentration of 2.0 percent.
Adding the monomer mixture solution into a reaction kettle, introducing argon to evacuate air in a system, and heating to 60 ℃; adding the initiator aqueous solution into the reaction kettle in batches, wherein the adding speed is based on the condition that the temperature of the reaction kettle does not exceed 90 ℃; after the initiator aqueous solution is added, heating the system to 80 ℃ for reaction for 2 hours, neutralizing the system with sodium hydroxide after the reaction is finished until the pH value is 8, and drying and crushing the obtained product to obtain the phosphine-containing drilling fluid filtrate reducer which is white powder.
The obtained product was characterized by infrared, and the results are shown in fig. 1. 3334cm in FIG. 1-1is-CONH2Radical vibration Peak, 3186cm-1is-OH group vibration peak, 2937cm-1is-CH2Radical vibration Peak, 1659cm-1Is a C ═ O group stretching vibration absorption peak, 1048cm-1is-P ═ O group stretching vibration absorption peak; from the above absorption peaks and analysis, it can be confirmed that the synthesized product is the target product.
Examples 2 to 9
Respectively preparing an organic phosphonic acid polymer fluid loss agent according to the method of example 1; the different formulations and conditions are shown in table 1:
TABLE 1 amounts of substances and reaction conditions for polymerization in examples 2 to 9
Comparative example
Mixing an Acrylamide (AM) monomer and an Acrylic Acid (AA) monomer according to the mass ratio of 70%: mixing 30 percent of the mixture to prepare a monomer mixture aqueous solution with the mass fraction of 30 percent; preparing 10% aqueous solution of initiator ammonium persulfate accounting for 0.2% of the total mass of the monomers.
Heating the reaction kettle to 65 ℃, adding the monomer mixture solution and the initiator aqueous solution into the reaction kettle in batches, wherein the adding speed is based on that the temperature of the reaction kettle does not exceed 80 ℃, heating the system to 90 ℃ for reaction for 5 hours after the monomer mixture aqueous solution and the initiator aqueous solution are added, neutralizing the system with sodium hydroxide until the pH value is 8 after the reaction is finished, obtaining a sticky product, and drying and crushing the sticky product to obtain the filtrate reducer for the P (AA/AM) drilling fluid.
Example 10
The fluid loss effect of the products obtained in the above examples and comparative examples was evaluated by the following methods:
(1) preparation of composite salt water slurry
Weighing 350mL of distilled water, placing the distilled water in a cup, adding 16.0g of sodium chloride, 2.6g of anhydrous calcium chloride and 6.9g of magnesium chloride, adding 52.5g of calcium bentonite (the calcium bentonite meets GB/T20973-2007 standard) and 3.15g of anhydrous sodium carbonate after the distilled water is dissolved, stirring at a high speed for 20min, stopping at least twice during the stirring, scraping the clay adhered to the wall of the container, and performing closed maintenance at 24 +/-3 ℃ for 24h to obtain composite brine slurry.
(2) Drilling fluid loss test
Adding a certain amount of the synthesized polymer into the base slurry obtained in the step (1), stirring at a high speed for 5min, placing for 6h, then placing into a high-temperature roller furnace, rolling and aging at 120 ℃ and 135 ℃ for 16h, then taking out, cooling to room temperature, stirring at a high speed for 5min, and measuring the medium pressure filtration loss of the drilling fluid at room temperature according to the regulation of GB/T16783.1-20067.2, wherein the temperature is 24 +/-3 ℃, and the pressure is 690 KPa.
(3) The evaluation results are shown in Table 2.
TABLE 2 results of drilling fluids after aging at ambient and elevated temperatures
The measurement result shows that the fluid loss agent for the organic phosphonic acid polymer drilling fluid shows remarkable fluid loss reducing effect after aging at 120 ℃/16h and 135 ℃/16h in the composite salt water drilling fluid, the result is superior to that of the fluid loss agent for the acrylic acid and acrylamide binary copolymer drilling fluid in the comparative example, and the fluid loss agent shows good calcium resistance.
The above description is only a preferred embodiment of the present invention, and it should be noted that various modifications to these embodiments can be implemented by those skilled in the art without departing from the technical principle of the present invention, and these modifications should be construed as the scope of the present invention.
Claims (3)
1. The application of an organic phosphonic acid polymer fluid loss agent in preparing a drilling fluid, wherein the organic phosphonic acid polymer fluid loss agent comprises a first repeating unit with a structure shown in a formula 1, a second repeating unit with a structure shown in a formula 2 and a third repeating unit with a structure shown in a formula 3:
in the formula 1, R1Selected from hydrogen or methyl; in the formula 2, R2And R3Independently selected from hydrogen, methyl or ethyl; the molar ratio of the first repeating unit to the second repeating unit to the third repeating unit is (0.05-0.55): (0.2-0.8): (0.1-0.5).
2. The use according to claim 1, wherein the pH value of the organic phosphonic acid polymer fluid loss agent is 7.5-8.5.
3. The use according to claim 1, wherein the preparation method of the organic phosphonic acid polymer fluid loss agent comprises the following steps:
mixing an isopropenylphosphonic acid monomer, an acrylamide monomer and a monomer containing carboxylic acid groups, and dissolving in water to obtain a monomer aqueous solution;
heating the monomer aqueous solution, mixing the monomer aqueous solution with an initiator aqueous solution, and carrying out polymerization reaction under the protection of argon, wherein the temperature of the polymerization reaction is 80-100 ℃, the time is 1-6 hours, and after the reaction is finished, neutralizing a system until the pH value is 7.5-8.5 to obtain an organic phosphonic acid polymer fluid loss agent;
the acrylamide monomer is selected from acrylamide, 2-methacrylamide, N-ethylacrylamide or N, N-dimethylacrylamide; the carboxylic acid group-containing monomer is selected from acrylic acid or 2-methacrylic acid, and the molar ratio of the isopropenylphosphonic acid monomer, the acrylamide monomer and the carboxylic acid group-containing monomer is (0.1-0.5): (0.2-0.8): (0.05-0.55), wherein the initiator is selected from ammonium persulfate or potassium persulfate, and the mass of the initiator is 0.1-1.0% of the total mass of the isopropenylphosphonic acid monomer, the acrylamide monomer and the carboxylic acid group-containing monomer.
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