CN111234788A - Wall-fixing agent modified resin polymer for drilling fluid - Google Patents
Wall-fixing agent modified resin polymer for drilling fluid Download PDFInfo
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Abstract
A wall-fixing agent modified resin polymer for drilling fluid is prepared from the following raw materials: 200-220 parts of clear water, 20-30 parts of starch, 8-10 parts of 40% sodium hydroxide aqueous solution, 5.0-10.0 parts of 2-chloroethyl trimethyl ammonium chloride, 20-30 parts of acrylamide, 10-20 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.5-1 part of initiator, 10-20 parts of potassium nitrohumate, 10-20 parts of pseudo-boehmite, 0-12 parts of poly-1, 3-propylene pyridinium chloride and 20-30 parts of auxiliary agent. The wall-fixing agent has the following properties: the water content is less than or equal to 10.0 percent, the filtration loss at low temperature and medium pressure is less than or equal to 10mL, the aging is carried out for 16 hours at normal temperature, high temperature of 150 ℃ and 180 ℃, and the filtration loss at high temperature and high pressure is less than or equal to 30.0 mL. The invention can resist high temperature of more than 180 ℃, effectively reduces the filtration loss, enhances the cementing power between rocks, and improves the anti-damage strength, thereby stabilizing the well wall, avoiding collapse, ensuring the safety of drilling engineering, and the invention also has environmental protection and good biodegradability.
Description
Technical Field
The invention relates to a wall fixing agent for drilling fluid, in particular to a wall fixing agent modified resin polymer for drilling fluid, belonging to petroleum drilling auxiliary agents. The invention also relates to a preparation method of the wall-fixing agent modified resin polymer for the drilling fluid.
Background
In petroleum and natural gas drilling engineering, the problem of well wall stability is always a difficult problem which puzzles the drilling boundary at home and abroad, and the economic loss is huge due to the instability of the well wall every year. The well wall stability is the guarantee of good quality of drilling engineering, and has great significance for stabilizing the well wall in soft and easily collapsed strata and shale sections.
The common liquid wall-fixing agent for the drilling fluid only starts from the aspect of reducing the unstable influence of the drilling fluid, and because the hydration expansion of the shale is not completely inhibited or the free water is not filtered, the drilling fluid treating agent can only reduce the influence caused by the instability of the well wall to a certain extent, and is not suitable for the stratum which is easy to collapse or pulp. In order to fundamentally avoid engineering accidents such as hole shrinkage and drill sticking caused by borehole wall instability, borehole wall collapse and the like, borehole wall rocks are directly reinforced while drilling, the mechanical stability of the borehole wall rocks is greatly improved, and meanwhile, the high efficiency and the environmental protection of products are required to be ensured.
The inventors searched the following related patent documents: CN109401737A discloses a wall-fixing agent modified resin polymer for drilling fluid and a preparation method thereof, wherein the modified resin polymer is prepared from the following raw materials: clear water, acrylic acid, N-dimethylacrylamide, calcium oxide, an initiator, sodium polyacrylate and magnesium oxide. The initiator is selected from one or more of sodium persulfate, potassium persulfate and ammonium persulfate. The preparation method comprises the following steps: aqueous solution polymerization to prepare copolymer powder and prepare the wall-fixing agent modified resin polymer. CN102250593A discloses an anti-collapse inhibitor for water-based drilling fluid, which relates to the technical field of anti-collapse inhibitors and preparation methods thereof, and comprises the following components in parts by weight: ethylene oxide: 60-100 parts; propylene oxide: 95-110 parts; organic amine: 50-60 parts; an initiator: 10-20 parts; catalyst: 2-5 parts. CN107418529A discloses a drilling fluid anti-sloughing agent, which is prepared by using itaconic acid as a raw material, reacting with ammonia gas after acylchlorination, carrying out rotary evaporation concentration to obtain a concentrated solution, reacting with 2-allyl alcohol, sodium allylsulfonate and the like, adding an initiator and an emulsifier for reaction to obtain an emulsion, reacting lignin with sodium periodate, filtering to obtain oxidized lignin, modifying the oxidized lignin, stirring with the emulsion, vinyl acetate homopolymerized rubber powder and a surfactant, and discharging. CN106701045A discloses an efficient plugging type drilling fluid anti-collapse agent, a production method and a use method thereof, the agent is composed of slow-breaking type cation emulsified asphalt, an anti-breaking emulsion and a softening point regulator, the slow-breaking type emulsifier, the anti-breaking emulsion and water are firstly prepared into soap solution and acidified, and the acidified soap solution and asphalt are ground into the slow-breaking type cation emulsified asphalt by a colloid mill. CN105419748A discloses a plugging anti-sloughing agent for drilling fluid based on oil-containing sludge and a preparation method thereof, wherein the preparation components are 30-80 parts of oil-containing sludge; 30-80 parts of petroleum asphalt; 30-160 parts of a sulfonating agent; 10-200 parts of sodium hydroxide solution; 30-300 parts of a light organic solvent; 1-20 parts of a surfactant; 1-30 parts of a fluid loss additive; 1-30 parts of inert filling material. CN104327807A discloses a non-fluorescent anti-sloughing agent for drilling fluid, wherein a positive nitrogen side group is introduced into modified polyvinyl alcohol through cationization reaction. Although the anti-collapse agents have certain shale inhibition capacity, the anti-collapse agents have poor effect on strengthening the cementing power between rocks, and part of materials have certain toxicity and pollution, so that the quality of drilling construction and the protection of environmental resources cannot be guaranteed.
The technologies can resist high temperature, effectively reduce the filtration loss, effectively enhance the cementing power between rocks, and improve the rupture strength, thereby stabilizing the well wall and avoiding collapse, and the technologies have environmental protection property, and no specific guidance scheme is given.
Disclosure of Invention
The invention aims to solve the technical problem of providing a wall-fixing agent modified resin polymer for drilling fluid, which can resist high temperature, effectively reduce the filtration loss, effectively enhance the cementing power between rocks, and improve the rupture strength, thereby stabilizing the well wall, avoiding collapse, and having environmental protection and good biodegradability.
Therefore, another technical problem to be solved by the present invention is to provide a method for preparing a wall-fixing agent modified resin polymer for drilling fluid.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the technical scheme of the wall-fixing agent modified resin polymer for the drilling fluid (or the modified resin polymer used as the wall-fixing agent for the drilling fluid) is that the wall-fixing agent modified resin polymer is prepared from the following raw materials in parts by mass: 200-220 parts of clear water, 20-30 parts of starch, 8-10 parts of a sodium hydroxide aqueous solution with the mass percentage concentration of 40%, 5.0-10.0 parts of 2-chloroethyltrimethyl ammonium chloride, 20-30 parts of acrylamide, 10-20 parts of methacryloyloxyethyl trimethylammonium chloride, 0.5-1 part of an initiator, 10-20 parts of potassium nitrohumate, 10-20 parts of pseudo-boehmite, 0-12 parts of poly-1, 3-propylidene pyridinium chloride and 20-30 parts of an auxiliary agent. The starch is one of corn flour, tapioca flour and sweet potato flour; the particle size of the pseudo-boehmite is 100-200 meshes, the pseudo-boehmite generates thixotropic gel in water, and the thixotropic gel is adsorbed in a well wall and well wall pores to play a role in increasing the well wall strength and reducing the filtration loss; the structural formula of the poly-1, 3-propylidene pyridinium chloride is as follows:
the number average molecular weight of the poly-1, 3-propylidene pyridinium chloride is 10000-20000, and the poly-1, 3-propylidene pyridinium chloride can be a commercial product; the poly-1, 3-propylidene pyridinium chloride is published in 2016, 8 months, chapter seven, chemical and treating agents for drilling fluid materials, page 285, compiled by Huanghanren. The auxiliary agent is MgO and Al2O3One or a combination of two raw materials, and the mixture ratio of the two raw materials (namely magnesium oxide and aluminum oxide) is arbitrary when the two raw materials are combined.
The preparation method of the wall-fixing agent modified resin polymer for the drilling fluid comprises the following process steps of ① preparing copolymer gel, adding part of clear water into a reaction kettle according to the mass ratio, wherein the adding amount of the clear water is 50-55% of the total mass of the clear water, adding starch into the clear water, slowly heating the temperature in the reaction kettle to 80-85 ℃, starting stirring, gelatinizing for 30-35 min, cooling the product to 40-45 ℃, gradually adding the sodium hydroxide aqueous solution into the reaction kettle to alkalize, alkalizing for 1-1.5 h, then adding 2-chloroethyltrimethylammonium chloride, slowly heating the temperature in the reaction kettle to 50-60 ℃ to react for 4-6 h, then adding the rest clear water into the reaction kettle, stirring uniformly, then sequentially adding acrylamide, methacryloyloxyethyltrimethylammonium chloride and an initiator into the reaction kettle to perform copolymerization reaction for 3-4 h at the temperature of 55-65 ℃ to obtain copolymer gel, ② preparing copolymer powder, placing the copolymer gel obtained in the step ① into an oven, drying at the temperature of 50-60 ℃, drying, preparing a copolymer powder, and mixing the copolymer powder to obtain a copolymer powder modified by a chlorinated polypropylene powder, and grinding to obtain a final product of humic acid-propylidene copolymer powder, wherein the copolymer is obtained by adding a chlorinated polypropylene chloride, and mixing the final step of a chlorinated polypropylene powder, wherein the step of 363-3, the product is a mixed solid-3, and the product of the chlorinated polypropylene powder is a chlorinated polypropylene-3, wherein the product, and the product is obtained by adding the chlorinated polypropylene-3.
In the above technical solution, a preferable technical solution may be that the initiator is one or a combination of two raw materials of potassium permanganate and potassium vanadate (potassium metavanadate), and when the two raw materials are combined, the mixing ratio is arbitrary, and the stirring speed (rotation speed) in the step ① is 50 to 100 r/min.
In the above technical solution, a preferable technical solution may also be that the wall-fixing agent modified resin polymer for drilling fluid is prepared from the following raw materials in parts by mass: 200 parts of clean water, 20 parts of starch, 9 parts of a sodium hydroxide aqueous solution with the mass percentage concentration of 40%, 7 parts of 2-chloroethyl trimethyl ammonium chloride, 25 parts of acrylamide, 15 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.5 part of an initiator, 10 parts of nitro potassium humate, 15 parts of pseudo-boehmite and 25 parts of an auxiliary agent; the starch is corn flour; the auxiliary agent is MgO and Al2O3Combination of two raw materials, MgO and Al2O3The initiator is the combination of two raw materials of potassium permanganate and potassium vanadate, the mass ratio of the potassium permanganate to the potassium vanadate is 1.5: 1, the preparation method of the wall-fixing agent modified resin polymer for the drilling fluid comprises the following process steps of ① preparing copolymer gel, adding 100 parts of clear water into a reaction kettle according to the mass ratio, adding starch into the clear water, slowly heating the temperature in the reaction kettle to 80 ℃, starting stirring, gelatinizing for 30min, cooling the product to 45 ℃, and gradually adding the sodium hydroxide aqueous solution into the reaction kettle to alkalifyAlkalizing for 1h, adding 2-chloroethyl trimethyl ammonium chloride, slowly heating the temperature in a reaction kettle to 55 ℃ for reaction for 5h, adding the rest clear water into the reaction kettle, uniformly stirring, sequentially adding acrylamide, methacryloyloxyethyl trimethyl ammonium chloride and an initiator into the reaction kettle for copolymerization reaction for 3h at 55 ℃ to obtain copolymer gel, ② preparing copolymer powder, namely placing the copolymer gel obtained in the step ① into a drying oven, drying at the temperature of 52 ℃ to obtain copolymer solid, crushing to obtain copolymer powder, ③ preparing a wall fixing agent, namely adding the copolymer powder obtained in the step ②, the potassium nitrohumate, pseudo-boehmite and an auxiliary agent into a mixer, uniformly mixing and stirring, and obtaining a final product, namely the wall fixing agent modified resin polymer for drilling fluid.
In the above technical solution, a preferable technical solution may also be that the wall-fixing agent modified resin polymer for drilling fluid is prepared from the following raw materials in parts by mass: 210 parts of clear water, 25 parts of starch, 8 parts of a sodium hydroxide aqueous solution with the mass percentage concentration of 40%, 7 parts of 2-chloroethyl trimethyl ammonium chloride, 30 parts of acrylamide, 10 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.75 part of an initiator, 15 parts of nitro potassium humate, 20 parts of pseudo-boehmite and 30 parts of an auxiliary agent; the starch is sweet potato powder; the auxiliary agent is MgO and Al2O3Combination of two raw materials, MgO and Al2O3The initiator is the combination of two raw materials of potassium permanganate and potassium vanadate, the mass ratio of the potassium permanganate to the potassium vanadate is 1: 1, the preparation method of the wall-fixing agent modified resin polymer for the drilling fluid comprises the following process steps of ① preparing copolymer gel, adding 110 parts of clear water into a reaction kettle according to the mass ratio, adding starch into the clear water, slowly heating the temperature in the reaction kettle to 80 ℃, starting stirring, gelatinizing for 30min, cooling the product to 45 ℃, gradually adding the sodium hydroxide aqueous solution into the reaction kettle for alkalization, after alkalization for 1h, adding 2-chloroethyl trimethyl ammonium chloride, slowly heating the temperature in the reaction kettle to 50 ℃ for reaction, reacting for 6h, and then placing the mixture into the reaction kettleAdding the rest clear water, stirring uniformly, then sequentially adding acrylamide, methacryloxyethyl trimethyl ammonium chloride and an initiator into a reaction kettle for copolymerization reaction for 4 hours at the temperature of 60 ℃ to obtain copolymer gel, ② preparing copolymer powder, namely putting the copolymer gel obtained in the step ① into an oven, drying at the temperature of 58 ℃ to obtain copolymer solid, crushing to obtain copolymer powder, ③ preparing a wall fixing agent, namely adding the copolymer powder obtained in the step ②, the nitro potassium humate, the pseudo-boehmite and the auxiliary agent into a mixer, mixing and stirring uniformly to obtain the final product, namely the wall fixing agent modified resin polymer for the drilling fluid.
In the above technical solution, a preferable technical solution may also be that the wall-fixing agent modified resin polymer for drilling fluid is prepared from the following raw materials in parts by mass: 220 parts of clear water, 30 parts of starch, 10 parts of a sodium hydroxide aqueous solution with the mass percentage concentration of 40%, 9 parts of 2-chloroethyl trimethyl ammonium chloride, 25 parts of acrylamide, 20 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.9 part of an initiator, 15 parts of nitropotassium humate, 15 parts of pseudo-boehmite and 30 parts of an auxiliary agent; the starch is cassava powder; the auxiliary agent is MgO and Al2O3Combination of two raw materials, MgO and Al2O3①, adding 110 parts of clear water into a reaction kettle according to the mass ratio, adding starch into the clear water, slowly heating the temperature in the reaction kettle to 85 ℃, starting stirring, gelatinizing for 30min, cooling the product to 45 ℃, gradually adding the sodium hydroxide aqueous solution into the reaction kettle for alkalization, after alkalization for 1h, adding 2-chloroethyl trimethyl ammonium chloride, slowly heating the temperature in the reaction kettle to 60 ℃ for reaction for 5h, then adding the rest clear water into the reaction kettle, stirring uniformly, and then sequentially adding acrylamide, methacryloyloxyethyl trimethyl ammonium chloride and an initiator into the reaction kettle for copolymerization and reverse reactionThe preparation method comprises the steps of reacting for 3 hours at 65 ℃ to obtain copolymer gel, ② preparing copolymer powder, putting the copolymer gel obtained in the step ① into an oven, drying at 55 ℃ to obtain copolymer solid, crushing to obtain copolymer powder, ③ preparing a wall fixing agent, adding the copolymer powder obtained in the step ②, the potassium nitrohumate, the pseudo-boehmite and the auxiliary agent into a mixer, mixing and stirring uniformly, and obtaining a final product, namely the wall fixing agent modified resin polymer for the drilling fluid.
Among the above technical solutions, the preferred technical solution can also be seen in example 4.
The invention provides a wall-fixing agent modified resin polymer for drilling fluid and a preparation method thereof, wherein the wall-fixing agent modified resin polymer is prepared from the following raw materials: clear water, starch, 40% sodium hydroxide aqueous solution, 2-chloroethyl trimethyl ammonium chloride, acrylamide, methacryloyloxyethyl trimethyl ammonium chloride, an initiator, potassium nitrohumate, pseudo-boehmite, poly (1, 3-propylidene pyridinium chloride) (the content can be 0) and an auxiliary agent. The preparation method comprises the following process steps: preparing copolymer gel and copolymer powder (namely performing aqueous solution graft polymerization and preparing polymer powder), and then uniformly mixing the semi-finished product with potassium nitrohumate, pseudo-boehmite, poly-1, 3-propylidene pyridine chloride (or no component) and an auxiliary agent according to a proportion to prepare the wall-fixing agent for the drilling fluid. The wall-fixing agent modified resin polymer achieves good performance effect, referring to tables 1 and 2 later in the specification, when the component-free poly 1, 3-propylene pyridine chloride is adopted, the wall-fixing agent modified resin polymer has the following performance: the water content is less than or equal to 10.0 percent, the filtration loss at low temperature and medium pressure is less than or equal to 10mL, the aging is carried out for 16 hours at normal temperature, high temperature of 150 ℃ and 180 ℃, and the filtration loss at high temperature and high pressure is less than or equal to 30.0 mL. The wall-fixing agent modified resin polymer for the drilling fluid can resist the high temperature of more than 180 ℃, effectively reduces the filtration loss, enhances the cementing power between rocks, and improves the collapse-resistant strength, thereby stabilizing the well wall, avoiding the collapse, ensuring the safety of the drilling engineering, and having environmental protection, high efficiency and good biodegradability. Compared with the prior art, the method has the advantages of relatively simplified process steps, simplicity, easiness in implementation, easiness in control and realization, energy conservation and suitability for industrial large-scale production.
Referring to Table 3 later in this specification, in conjunction with example 4, the wall-fixing agent-modified resin polymer of the present invention, when having the component poly-1, 3-propylidene pyridinium chloride, is resistant to high temperatures above 190 ℃ in addition to the above properties.
In conclusion, the invention can resist high temperature of more than 180 ℃, not only can effectively enhance the stability of the well wall, but also can reduce the filtration loss, avoid the collapse of the well wall and ensure the safety of the drilling engineering.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Examples 1 to 4 are the wall-fixing agent modified resin polymer and the preparation method thereof. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.
Example 1: the wall-fixing agent modified resin polymer for the drilling fluid is prepared from the following raw materials in parts by mass: 200 parts of clean water, 20 parts of starch, 9 parts of a sodium hydroxide aqueous solution with the mass percentage concentration of 40%, 7 parts of 2-chloroethyl trimethyl ammonium chloride, 25 parts of acrylamide, 15 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.5 part of an initiator, 10 parts of nitro potassium humate, 15 parts of pseudo-boehmite and 25 parts of an auxiliary agent; the starch is corn flour; the granularity of the pseudo-boehmite is 120 meshes; the auxiliary agent is MgO and Al2O3Combination of two raw materials, MgO and Al2O3The initiator is the combination of two raw materials of potassium permanganate and potassium vanadate, the mass ratio of the potassium permanganate to the potassium vanadate is 1.5: 1, the preparation method of the wall-fixing agent modified resin polymer for the drilling fluid comprises the following process steps of ① preparing copolymer gel, adding 100 parts of clear water into a reaction kettle according to the mass ratio, adding starch into the clear water, and mixing the reaction kettle with the clear waterSlowly heating the inner temperature to 80 ℃, starting stirring (the rotating speed of a stirrer is 70-75 r/min), gelatinizing for 30min, cooling the product to 45 ℃, gradually adding the sodium hydroxide aqueous solution into the reaction kettle for alkalization, adding 2-chloroethyl trimethyl ammonium chloride after alkalization is carried out for 1h, slowly heating the temperature in the reaction kettle to 55 ℃ for reaction for 5h, adding the rest clear water into the reaction kettle, stirring uniformly, sequentially adding acrylamide, methacryloyloxyethyl trimethyl ammonium chloride and an initiator into the reaction kettle for copolymerization reaction at the temperature of 55 ℃ for 3h to obtain copolymer gel, ② preparing copolymer powder, placing the copolymer gel obtained in step ① into an oven, drying at the temperature of 52 ℃ to obtain copolymer solid, crushing to obtain copolymer powder, ③ preparing wall fixing agent, adding the copolymer powder obtained in step ②, the potassium nitrohumate, pseudo-boehmite and an auxiliary agent into a mixing machine for mixing and stirring uniformly to obtain the final product, namely the wall fixing agent modified resin polymer for drilling fluid.
Example 2: the wall-fixing agent modified resin polymer for the drilling fluid is prepared from the following raw materials in parts by mass: 210 parts of clear water, 25 parts of starch, 8 parts of a sodium hydroxide aqueous solution with the mass percentage concentration of 40%, 7 parts of 2-chloroethyl trimethyl ammonium chloride, 30 parts of acrylamide, 10 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.75 part of an initiator, 15 parts of nitro potassium humate, 20 parts of pseudo-boehmite and 30 parts of an auxiliary agent; the starch is sweet potato powder; the granularity of the pseudo-boehmite is 140 meshes; the auxiliary agent is MgO and Al2O3Combination of two raw materials, MgO and Al2O3The initiator is the combination of two raw materials of potassium permanganate and potassium vanadate, the mass ratio of the potassium permanganate to the potassium vanadate is 1: 1, the preparation method of the wall-fixing agent modified resin polymer for the drilling fluid comprises the following process steps of ① preparing copolymer gel, adding 110 parts of clear water into a reaction kettle according to the mass ratio, adding starch into the clear water, slowly heating the temperature in the reaction kettle to 80 ℃, starting stirring (the rotating speed of a stirrer is 80-90 r/min), gelatinizing for 30min, and cooling the product to 45%The preparation method comprises the steps of gradually adding the sodium hydroxide aqueous solution into a reaction kettle for alkalization, adding 2-chloroethyl trimethyl ammonium chloride after the alkalization is carried out for 1 hour, slowly heating the temperature in the reaction kettle to 50 ℃ for reaction for 6 hours, then adding the rest clear water into the reaction kettle, stirring uniformly, then sequentially adding acrylamide, methacryloyloxyethyl trimethyl ammonium chloride and an initiator into the reaction kettle for copolymerization reaction for 4 hours at the temperature of 60 ℃ to obtain copolymer gel, ② preparing copolymer powder, namely putting the copolymer gel obtained in the step ① into an oven, drying at the temperature of 58 ℃ to obtain copolymer solid, crushing to obtain copolymer powder, ③ preparing a wall-fixing agent, namely adding the copolymer powder obtained in the step ②, the potassium nitrohumate, the pseudo-boehmite and an auxiliary agent into a mixing machine for uniformly mixing and stirring uniformly to obtain a final product, namely the wall-fixing agent modified resin polymer for the drilling fluid.
Example 3: the wall-fixing agent modified resin polymer for the drilling fluid is prepared from the following raw materials in parts by mass: 220 parts of clear water, 30 parts of starch, 10 parts of a sodium hydroxide aqueous solution with the mass percentage concentration of 40%, 9 parts of 2-chloroethyl trimethyl ammonium chloride, 25 parts of acrylamide, 20 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.9 part of an initiator, 15 parts of nitropotassium humate, 15 parts of pseudo-boehmite and 30 parts of an auxiliary agent; the starch is cassava powder; the granularity of the pseudo-boehmite is 160 meshes; the auxiliary agent is MgO and Al2O3Combination of two raw materials, MgO and Al2O3The initiator is the combination of two raw materials of potassium permanganate and potassium vanadate, the mass ratio of the potassium permanganate to the potassium vanadate is 1: 2, the preparation method of the wall-fixing agent modified resin polymer for the drilling fluid comprises the following process steps of ① preparing copolymer gel, adding 110 parts of clear water into a reaction kettle according to the mass ratio, adding starch into the clear water, slowly heating the temperature in the reaction kettle to 85 ℃, starting stirring (the rotating speed of a stirrer is 75-80 r/min), gelatinizing for 30min, cooling the product to 45 ℃, gradually adding the sodium hydroxide aqueous solution into the reaction kettle for alkalization, and after alkalization for 1h, adding 2-chloroethyl trimethyl chlorideAmmonium dissolving, namely slowly heating the temperature in a reaction kettle to 60 ℃ for reaction for 5 hours, then adding the rest clear water into the reaction kettle, stirring uniformly, then sequentially adding acrylamide, methacryloxyethyltrimethyl ammonium chloride and an initiator into the reaction kettle for copolymerization reaction for 3 hours at the temperature of 65 ℃ to obtain copolymer gel, ② preparing copolymer powder, namely putting the copolymer gel obtained in the step ① into an oven, drying at the temperature of 55 ℃ to obtain copolymer solid, crushing to obtain copolymer powder, ③ preparing a wall fixing agent, namely adding the copolymer powder obtained in the step ②, the potassium nitrohumate, the pseudo-boehmite and the auxiliary agent into a mixer, mixing and stirring uniformly, and obtaining a final product, namely the wall fixing agent modified resin polymer for drilling fluid ②.
Example 4: the wall-fixing agent modified resin polymer for the drilling fluid is prepared from the following raw materials in parts by mass: 215 parts of clear water, 28 parts of starch, 10 parts of a sodium hydroxide aqueous solution with the mass percentage concentration of 40%, 8 parts of 2-chloroethyl trimethyl ammonium chloride, 27 parts of acrylamide, 17 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.8 part of an initiator, 18 parts of potassium nitrohumate, 17 parts of pseudo-boehmite, 12 parts of poly-1, 3-propylidene pyridinium chloride and 28 parts of an auxiliary agent; the granularity of the pseudo-boehmite is 120 meshes; the number average molecular weight of the poly-1, 3-propylidene pyridinium chloride is 12000; the starch is cassava powder; the auxiliary agent is MgO and Al2O3Combination of two raw materials, MgO and Al2O3The initiator is the combination of two raw materials of potassium permanganate and potassium vanadate, the mass ratio of the potassium permanganate to the potassium vanadate is 1: 1.5, the preparation method of the wall-fixing agent modified resin polymer for the drilling fluid comprises the following process steps of ① preparing copolymer gel, adding 110 parts of clear water into a reaction kettle according to the mass ratio, adding starch into the clear water, slowly heating the temperature in the reaction kettle to 82 ℃, starting stirring (the rotating speed of a stirrer can be 75-80 r/min), gelatinizing for 30min, cooling the product to 42 ℃, gradually adding the sodium hydroxide aqueous solution into the reaction kettle for alkalization, adding 2-chloroethyl trimethyl ammonium chloride after alkalization for 1h, and adding 2-chloroethyl trimethyl ammonium chloride to alkalize the sodium hydroxide aqueous solutionHeating the temperature in a reaction kettle slowly to 60 ℃ for reaction for 6 hours, adding the rest clear water into the reaction kettle, stirring uniformly, sequentially adding acrylamide, methacryloxyethyltrimethyl ammonium chloride and an initiator into the reaction kettle for copolymerization reaction at 65 ℃ for 4 hours to obtain copolymer gel, ② preparing copolymer powder, namely putting the copolymer gel obtained in the step ① into an oven, drying at 55 ℃ to obtain copolymer solid, crushing to obtain copolymer powder, ③ preparing a wall fixing agent, namely adding the copolymer powder obtained in the step ②, the potassium nitrohumate, pseudo-boehmite, poly-1, 3-propylidene pyridinium chloride and an auxiliary agent into a mixer, mixing and stirring uniformly, and obtaining a final product, namely the wall fixing agent modified resin polymer for the drilling fluid.
The following are the experimental part of the invention:
and (3) moisture determination: weighing about 1g to 1.5g of sample to be accurate to 0.0001g by using a weighing bottle which is dried for 2h at 105 +/-2 ℃, putting the sample in a 105 +/-2 ℃ oven to be dried for 4h, taking out the sample, immediately putting the sample in a drier to be cooled for 30min, weighing, and calculating the water content according to the following formula.
In the formula:
w-moisture,%;
m2-sample and weigh bottle mass in grams (g);
m3-the dried sample and the weight of the weighing flask in grams (g);
m1-weighing the bottle mass in grams (g).
The performance of the drilling fluid is as follows:
preparing base slurry: adding 400mL of distilled water, 0.60g of anhydrous sodium carbonate, 16.00g of bentonite for drilling fluid test slurry preparation and 8.00g of test evaluation soil for drilling fluid into a high-stirring cup, stirring at a high speed for 20min, stopping twice during stirring, scraping off an adhesive adhered to the cup wall, and performing closed maintenance at 25 +/-1 ℃ for 24 h.
Measurement of the filtration loss under pressure at room temperature and under pressure at high temperature: and (3) adding 8.00g of sample into the maintained base slurry, adjusting the pH value of the sample slurry to 10 by using a 20% NaOH solution in the high-speed stirring process, stirring at a high speed for 20min, stopping twice in the stirring process, and scraping off the adhered substances adhered to the cup wall. And testing the low-temperature low-pressure filtration loss and the high-temperature high-pressure filtration loss (150 ℃, the pressure difference is 3.5MPa) according to the requirements of GB/T16783.1.
And (3) measuring the high-temperature and high-pressure filtration loss after aging: taking two cups of the base slurry after maintenance, respectively adding 8.00g of samples, adjusting the pH value of the sample slurry to 10 by using a 20% NaOH solution in the high-speed stirring process, stirring at a high speed for 20min, stopping twice in the middle of stirring, and scraping off the adhered substances adhered to the cup walls. Aging at 150 deg.C and 180 deg.C for 16h, respectively, and testing high temperature and high pressure filtration loss (150 deg.C, pressure difference 3.5MPa) according to GB/T16783.1.
The wall-fixing agent modified resin polymer for drilling fluid achieves good performance effect, and is shown in the following tables 1, 2 and 3. Tables 1 and 2 show the results of the measurement of the properties of the polymer of the wall-fixing agent-modified resin of the present invention in the absence of poly (1, 3-propylidene pyridinium chloride). Table 3 shows the results of the measurement of the properties of the polymer of the wall-fixing agent-modified resin of the present invention when it has the component poly (1, 3-propylidene pyridinium chloride) (see example 4). The addition amount (weight percentage) of the wall-fixing agent modified resin polymer prepared in each example of the invention in table 1 and table 3 was 2%.
TABLE 1 measurement results of the Properties of the Polymer of the wall-fixing agent-modified resin prepared in each example
| Examples | Water content% | Low temperature low pressure filtration loss, mL | High temperature high pressure filtration loss, mL |
| Example 1 | 8.2 | 7.2 | 17.1 |
| Example 2 | 8.5 | 6.2 | 16.2 |
| Example 3 | 7.9 | 6.8 | 16.9 |
TABLE 2 measurement of the properties of the wall-fixing agent modified resin polymers prepared in the examples after aging
TABLE 3 measurement of the properties of the wall-fixing agent-modified resin Polymer prepared in example 4 after aging
In conclusion, the wall solidification agent (modified resin polymer) for the drilling fluid prepared by the embodiments of the invention can resist high temperature of more than 180 ℃, effectively reduce the filtration loss, enhance the cementing power between rocks, and improve the anti-damage strength, thereby stabilizing the well wall, avoiding collapse, and ensuring the safety of drilling engineering, and also has the advantages of environmental protection and good biodegradability. Compared with the prior art, the method has the advantages of relatively simplified process steps, simplicity, easiness in implementation, easiness in control and realization, and suitability for industrial large-scale production.
Claims (7)
1. A wall-fixing agent modified resin polymer for drilling fluid is characterized by being prepared from the following raw materials in parts by mass: 200-220 parts of clear water, 20-30 parts of starch, 8-10 parts of a sodium hydroxide aqueous solution with the mass percentage concentration of 40%, 5.0-10.0 parts of 2-chloroethyltrimethyl ammonium chloride, 20-30 parts of acrylamide, 10-20 parts of methacryloyloxyethyl trimethylammonium chloride, 0.5-1 part of an initiator, 10-20 parts of potassium nitrohumate, 10-20 parts of pseudo-boehmite, 0-12 parts of poly-1, 3-propylidene pyridinium chloride and 20-30 parts of an auxiliary agent;
the starch is one of corn flour, tapioca flour and sweet potato flour; the granularity of the pseudo-boehmite is 100-200 meshes; the structural formula of the poly-1, 3-propylidene pyridinium chloride is as follows:
the number average molecular weight of the poly-1, 3-propylidene pyridine chloride is 10000-20000; the auxiliary agent is MgO and Al2O3One or two raw materials are combined, and the proportion of the two raw materials is optional when the two raw materials are combined;
the preparation method of the resin polymer modified by the wall-fixing agent for the drilling fluid comprises the following process steps of ① preparing copolymer gel, adding part of clear water into a reaction kettle according to the mass ratio, wherein the adding amount of the clear water is 50-55% of the total mass of the clear water, adding starch into the clear water, slowly heating the temperature in the reaction kettle to 80-85 ℃, starting stirring, gelatinizing for 30-35 min, cooling the product to 40-45 ℃, gradually adding the sodium hydroxide aqueous solution into the reaction kettle for alkalization, adding 2-chloroethyltrimethyl ammonium chloride after alkalization for 1-1.5 h, slowly heating the temperature in the reaction kettle to 50-60 ℃ for reaction for 4-6 h, adding the rest clear water into the reaction kettle, stirring uniformly, then sequentially adding acrylamide, methacryloyloxyethyltrimethylammonium chloride and an initiator into the reaction kettle for copolymerization reaction for 3-4 h at the temperature of 55-65 ℃ to obtain copolymer gel, ② preparing copolymer powder, placing the copolymer gel obtained in a drying oven at the temperature of 50-60 ℃, drying the copolymer gel, preparing the copolymer powder, and adding the copolymer powder modified by a humic acid-ammonium chloride powder and mixing to obtain a final humic acid-pyridine copolymer powder, namely a polyvinyl chloride wall- ③, and mixing to obtain a final product of a chlorinated polyethylene-ammonium chloride copolymer powder.
2. The wall-fixing agent modified resin polymer for drilling fluid according to claim 1, wherein the initiator is one or a combination of two raw materials selected from potassium permanganate and potassium vanadate, and the ratio of the two raw materials is arbitrary when the two raw materials are combined.
3. The wall-fixing agent modified resin polymer for drilling fluid as claimed in claim 1, which is characterized by being prepared from the following raw materials in parts by mass: 200 parts of clean water, 20 parts of starch, 9 parts of a sodium hydroxide aqueous solution with the mass percentage concentration of 40%, 7 parts of 2-chloroethyl trimethyl ammonium chloride, 25 parts of acrylamide, 15 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.5 part of an initiator, 10 parts of nitro potassium humate, 15 parts of pseudo-boehmite and 25 parts of an auxiliary agent; the starch is corn flour; the auxiliary agent is MgO and Al2O3Combination of two raw materials, MgO and Al2O3The mass ratio of (A) to (B) is 2: 1; the initiator is the combination of two raw materials of potassium permanganate and potassium vanadate, and the mass ratio of the potassium permanganate to the potassium vanadate is 1.5: 1;
the preparation method of the wall-fixing agent modified resin polymer for the drilling fluid comprises the following process steps of ① preparing copolymer gel, namely adding 100 parts of clear water into a reaction kettle according to the mass ratio, adding starch into the clear water, slowly heating the temperature in the reaction kettle to 80 ℃, starting stirring, gelatinizing for 30min, cooling the product to 45 ℃, gradually adding the sodium hydroxide aqueous solution into the reaction kettle for alkalization, adding 2-chloroethyltrimethyl ammonium chloride after alkalization for 1h, slowly heating the temperature in the reaction kettle to 55 ℃ for reaction for 5h, then adding the rest clear water into the reaction kettle, stirring uniformly, sequentially adding acrylamide, methacryloyloxyethyltrimethylammonium chloride and an initiator into the reaction kettle for copolymerization reaction for 3h at the temperature of 55 ℃ to obtain copolymer gel, ② preparing copolymer powder, putting the copolymer gel obtained in the step ① into an oven, drying at the temperature of 52 ℃ to obtain copolymer solid, crushing to obtain copolymer powder, and ③ preparing the wall-fixing agent, namely adding the copolymer powder obtained in the step ②, the potassium humate and the pseudo-aluminum humate modified resin polymer into a mixer to obtain a final wall-fixing agent mixed and stirring auxiliary agent for mixing uniformly.
4. The wall-fixing agent modified resin polymer for drilling fluid as claimed in claim 1, which is characterized by being prepared from the following raw materials in parts by mass: 210 parts of clear water, 25 parts of starch, 8 parts of a sodium hydroxide aqueous solution with the mass percentage concentration of 40%, 7 parts of 2-chloroethyl trimethyl ammonium chloride, 30 parts of acrylamide, 10 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.75 part of an initiator, 15 parts of nitro potassium humate, 20 parts of pseudo-boehmite and 30 parts of an auxiliary agent; the starch is sweet potato powder; the auxiliary agent is MgO and Al2O3Combination of two raw materials, MgO and Al2O3The mass ratio of (1.5: 1); the initiator is the combination of two raw materials of potassium permanganate and potassium vanadate, and the mass ratio of the potassium permanganate to the potassium vanadate is 1: 1;
the preparation method of the wall-fixing agent modified resin polymer for the drilling fluid comprises the following process steps of ① preparing copolymer gel, namely adding 110 parts of clear water into a reaction kettle according to the mass ratio, adding starch into the clear water, slowly heating the temperature in the reaction kettle to 80 ℃, starting stirring, gelatinizing for 30min, cooling the product to 45 ℃, gradually adding the sodium hydroxide aqueous solution into the reaction kettle for alkalization, adding 2-chloroethyltrimethyl ammonium chloride after alkalization for 1h, slowly heating the temperature in the reaction kettle to 50 ℃ for reaction for 6h, then adding the rest clear water into the reaction kettle, stirring uniformly, sequentially adding acrylamide, methacryloyloxyethyltrimethylammonium chloride and an initiator into the reaction kettle for copolymerization reaction for 4h at the temperature of 60 ℃ to obtain copolymer gel, ② preparing copolymer powder, putting the copolymer gel obtained in the step ① into an oven, drying at the temperature of 58 ℃ to obtain copolymer solid, crushing to obtain copolymer powder, and ③ preparing the wall-fixing agent, namely adding the copolymer powder obtained in the step ②, the potassium humate and the pseudo-aluminum humate modified resin polymer into a mixer to obtain a final wall-fixing agent mixed and stirring auxiliary agent for mixing uniformly.
5. The wall-fixing agent modified resin polymer for drilling fluid as claimed in claim 1, which is characterized by being prepared from the following raw materials in parts by mass: 220 parts of clear water, 30 parts of starch, 10 parts of a sodium hydroxide aqueous solution with the mass percentage concentration of 40%, 9 parts of 2-chloroethyl trimethyl ammonium chloride, 25 parts of acrylamide, 20 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.9 part of an initiator, 15 parts of nitropotassium humate, 15 parts of pseudo-boehmite and 30 parts of an auxiliary agent; the starch is cassava powder; the auxiliary agent is MgO and Al2O3Combination of two raw materials, MgO and Al2O3The mass ratio of (A) to (B) is 2: 1; the initiator is the combination of two raw materials of potassium permanganate and potassium vanadate, and the mass ratio of the potassium permanganate to the potassium vanadate is 1: 2;
the preparation method of the wall-fixing agent modified resin polymer for the drilling fluid comprises the following process steps of ① preparing copolymer gel, namely adding 110 parts of clear water into a reaction kettle according to the mass ratio, adding starch into the clear water, slowly heating the temperature in the reaction kettle to 85 ℃, starting stirring, gelatinizing for 30min, cooling the product to 45 ℃, gradually adding the sodium hydroxide aqueous solution into the reaction kettle for alkalization, adding 2-chloroethyltrimethyl ammonium chloride after alkalization for 1h, slowly heating the temperature in the reaction kettle to 60 ℃ for reaction for 5h, then adding the rest clear water into the reaction kettle, stirring uniformly, sequentially adding acrylamide, methacryloyloxyethyltrimethylammonium chloride and an initiator into the reaction kettle for copolymerization reaction for 3h at 65 ℃ to obtain copolymer gel, ② preparing copolymer powder, putting the copolymer gel obtained in the step ① into an oven, drying at 55 ℃ to obtain copolymer solid, crushing to obtain copolymer powder, and ③ preparing the wall-fixing agent, namely adding the copolymer powder obtained in the step ②, the potassium humate and the pseudo-wall-modifying resin polymer into a mixer, and stirring uniformly to obtain the final wall-fixing agent.
6. The wall-fixing agent modified resin polymer for drilling fluid as claimed in claim 1, which is characterized by being prepared from the following raw materials in parts by mass: 215 parts of clear water, 28 parts of starch, 10 parts of a sodium hydroxide aqueous solution with the mass percentage concentration of 40%, 8 parts of 2-chloroethyl trimethyl ammonium chloride, 27 parts of acrylamide, 17 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.8 part of an initiator, 18 parts of potassium nitrohumate, 17 parts of pseudo-boehmite, 12 parts of poly-1, 3-propylidene pyridinium chloride and 28 parts of an auxiliary agent; the number average molecular weight of the poly-1, 3-propylidene pyridinium chloride is 12000; the starch is cassava powder; the auxiliary agent is MgO and Al2O3Combination of two raw materials, MgO and Al2O3The mass ratio of (1.5: 1); the initiator is the combination of two raw materials of potassium permanganate and potassium vanadate, and the mass ratio of the potassium permanganate to the potassium vanadate is 1: 1.5;
the preparation method of the wall-fixing agent modified resin polymer for the drilling fluid comprises the following process steps of ① preparing copolymer gel, adding 110 parts of clear water into a reaction kettle according to the mass ratio, adding starch into the clear water, slowly heating the temperature in the reaction kettle to 82 ℃, starting stirring, gelatinizing for 30min, cooling the product to 42 ℃, gradually adding the sodium hydroxide aqueous solution into the reaction kettle for alkalization, adding 2-chloroethyltrimethyl ammonium chloride after alkalization for 1h, slowly heating the temperature in the reaction kettle to 60 ℃ for reaction for 6h, then adding the rest clear water into the reaction kettle, stirring uniformly, sequentially adding acrylamide, methacryloyloxyethyl trimethylammonium chloride and an initiator into the reaction kettle for copolymerization reaction for 4h at 65 ℃ to obtain copolymer gel, ② preparing copolymer powder, placing the copolymer gel obtained in the step ① into an oven, drying at 55 ℃ to obtain copolymer solid, crushing to obtain copolymer powder, ③ preparing the wall-fixing agent, adding the copolymer powder obtained in the step ②, potassium humate, ammonium humate and a wall-poly-propylidene resin modifier, and adding the final chlorinated wall-fixing agent into a mixing and stirring and mixing to obtain the wall-fixing agent.
7. The wall-fixing agent modified resin polymer for drilling fluid as claimed in claim 1, 2, 3, 4, 5 or 6, wherein the stirring rate in the step ① is 50-100 r/min.
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