CN111704695A - Multifunctional drilling treatment agent and preparation and application thereof - Google Patents
Multifunctional drilling treatment agent and preparation and application thereof Download PDFInfo
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- CN111704695A CN111704695A CN202010498709.4A CN202010498709A CN111704695A CN 111704695 A CN111704695 A CN 111704695A CN 202010498709 A CN202010498709 A CN 202010498709A CN 111704695 A CN111704695 A CN 111704695A
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- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
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- C09K8/02—Well-drilling compositions
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Abstract
A multifunctional drilling treating agent is prepared from starch, cellulose and acrylamide through dispersing polymerization, graft copolymerizing, and features that the raw materials include starch, cellulose, acrylamide, oxidant, reducer, water-soluble compound monomer containing double bond and dispersion stabilizer. The multifunctional drilling treatment agent effectively combines the comprehensive effects of natural polymer products, namely starch, cellulose and polymer products, has excellent shear performance, can improve the suspension property and sand carrying property of drilling fluid, and cannot greatly improve the apparent viscosity of the drilling fluid; the filtrate loss reducing performance is excellent, and the temperature and salt resistance effect is good; meanwhile, the composite material has good coating inhibition performance, can effectively coat clay and drill cuttings, prevents solid-phase pollution, is easy to degrade, has no pollution, has excellent comprehensive performance, can meet the requirements of maintenance and treatment of the current on-site drilling fluid, has wide application prospect, and is particularly suitable for extended reach wells and solid-free drilling fluids.
Description
Technical Field
The application belongs to the field of drilling treatment agents, and particularly relates to a multifunctional drilling treatment agent and preparation and application thereof.
Background
With the increase of world energy demand and the development of drilling technology, the treating agent for the drilling fluid becomes an indispensable part in the drilling process. Meanwhile, due to the continuous increase of the drilling depth, the drilling of the stratum is increasingly complex, the environmental protection is increasingly emphasized, and the requirement of the drilling operation on the drilling fluid treatment agent is higher and higher.
In addition, with the rapid increase of the world oil and gas resource demand and the continuous development of oil drilling technology, the number of horizontal wells and extended reach wells is rapidly increased, the drilling engineering is also developed from land to ocean, the reservoir protection requirement is more and more strict, and the application of saline drilling fluid and solid-free drilling technology is more and more extensive. The drilling process has higher and higher requirements on the rheological property and the salt resistance of a drilling fluid system, and particularly has higher requirements on the fluid loss reduction performance and the sand carrying performance. The solid-free salt water drilling fluid has good rheological property, inhibition property, lubrication property and cooling property, is beneficial to improving the drilling speed, can greatly improve the efficient rock breaking capacity of the drill bit, can improve the service life of the drill bit, and can effectively protect the well wall due to good inhibition property, so that the solid-free salt water drilling fluid is more and more widely applied; but has the defects of large water loss, poor rock carrying capacity and the like. The extended reach well can fully utilize the existing platform or land-based development marginal oil fields and offshore oil and gas fields, and a plurality of oil and gas reservoirs are connected in series, so that a large amount of cost for repeated construction can be saved, and investment is saved; however, the extended reach well has a large horizontal section, and the horizontal section has very high requirements on sand carrying capacity and suspension performance of mud for reservoir protection.
The rapid development of the advanced drilling technologies puts higher requirements on the drilling fluid, which mainly reflects that the requirement on the shearing force of the drilling fluid is higher so as to improve the suspension property of the drilling fluid, facilitate sand carrying, reduce the bad phenomena of sand setting, drill sticking and the like; the filtration loss of the drilling fluid is required to be as low as possible, the effect of protecting the well wall is achieved, the differential pressure drill sticking caused by the formation of an over-thick mud cake is prevented, the coating inhibition of the drilling fluid is strong, and the solid phase pollution is prevented while the stability of the well wall is maintained. At present, no product can simultaneously meet the technical requirements in the market, and multiple products are compounded for use to achieve the technical requirements. The complex use of multiple materials not only makes the regulation and maintenance process of the drilling fluid complex, but also is easy to cause the performance change of the drilling fluid due to the compatibility problem of different materials, and even seriously affects the smooth progress of drilling.
Disclosure of Invention
The multifunctional drilling treatment agent is an acrylamide grafted starch/cellulose copolymer, has the effects of reducing filtration loss, improving cutting, tackifying, inhibiting coating and the like, has excellent comprehensive performance, can realize multiple effects of a single drilling treatment agent, is simple and convenient to operate, has easily-adjusted drilling fluid performance, and can effectively reduce the drilling fluid performance change caused by compatibility problems of various materials in the drilling fluid maintenance process.
The multifunctional drilling treatment agent is prepared by adopting a dispersion polymerization process and by graft copolymerization of starch and cellulose with acrylamide under the action of an initiator.
In the multifunctional well treatment agent provided herein, the initiator comprises an oxidizing agent and a reducing agent; the multifunctional drilling treatment agent comprises raw materials and a solvent, wherein the raw materials of the multifunctional drilling treatment agent comprise the following components in percentage by mass: 30-80% of starch, 10-40% of cellulose, 5-45% of acrylamide, 0-15% of double bond-containing water-soluble compound monomer, optionally 0.5-15%, 0.5-5% of oxidizing agent, 0.5-5% of reducing agent and 0.5-5% of dispersion stabilizer. Alternatively, the double bond-containing water-soluble compound monomer may not be added.
Preferably, the raw materials of the multifunctional drilling treatment agent comprise the following components in percentage by mass: 40-70% of starch, 15-35% of cellulose, 10-35% of acrylamide, 2-10% of double-bond water-soluble compound monomer, 1-2% of oxidant, 1-2% of reducer and 1-3% of dispersion stabilizer.
Optionally, the raw materials of the multifunctional well drilling treatment agent consist of starch, cellulose, acrylamide, double bond-containing water-soluble compound monomer, an oxidizing agent, a reducing agent and a dispersion stabilizer.
In the multifunctional well drilling treating agent provided by the application, the double-bond-containing water-soluble compound monomer is selected from one or more of aminoacrylic acid, aminoacrylic acid salt, styrene sulfonate and allyl quaternary ammonium salt;
in the multifunctional well treatment provided herein, the oxidizing agent is selected from one or more of hydrogen peroxide, ammonium persulfate, potassium persulfate, and sodium persulfate;
in the multifunctional well treatment agent provided by the application, the reducing agent is selected from one or more of ferrous sulfate, sodium sulfite and amine sulfite.
In the multifunctional well drilling treating agent provided by the application, the dosage of the solvent is 1-5 times of the total weight of the raw materials of the multifunctional well drilling treating agent;
optionally, the solvent is selected from one or more of isopropanol, ethanol, ethylene glycol and propylene glycol;
preferably, the solvent consists of isopropanol and ethanol, the dosage of the solvent is 1.5-3 times of the total weight of the raw materials of the multifunctional drilling treatment agent, and the weight ratio of the isopropanol to the ethanol is (2:8) - (8: 2).
In the multifunctional drilling treatment agent provided by the application, the starch is selected from one or more than two of pregelatinized starch, sulfonated starch, carboxymethyl starch and temperature-resistant starch;
optionally, the starch has a particle size of 60-120 mesh;
optionally, the cellulose is selected from one or more of hydroxypropyl cellulose, hydroxymethyl cellulose, polyanionic cellulose and sodium carboxymethyl cellulose.
In the multifunctional well treatment agent provided herein, the dispersion stabilizer is selected from one or more of polyethylene glycol, an anionic surfactant and a cationic surfactant;
optionally, the dispersion stabilizer is selected from one or more of polyethylene glycol, alkyl sulfonate and quaternary ammonium salt.
In still another aspect, the present application provides a method for preparing the multifunctional well drilling treatment agent, comprising:
(1) adding a solvent, acrylamide, starch, cellulose and a double-bond-containing water-soluble compound monomer into a reaction container, adding an oxidant and a dispersion stabilizer, and stirring until the components are completely dissolved;
(2) adjusting the pH value of the solution in the reaction container to 8-10;
(3) introducing protective gas into the reaction container;
(4) dropwise adding a reducing agent aqueous solution within 40-60 minutes;
(5) continuously stirring and reacting for 2-3 hours at the temperature of 30-50 ℃;
(6) separating the generated precipitate under the atmosphere of protective gas;
(7) and (3) drying the precipitate obtained in the step (6) at the temperature of 60-80 ℃ and the vacuum degree of 0.01-0.05MPa to obtain the multifunctional drilling treatment agent. Optionally, the preparation of the multifunctional well treatment agent consists of the steps described above.
In the preparation method of the multifunctional well drilling treatment agent, the protective gas is selected from one or more of nitrogen, helium and argon;
optionally, the mass concentration of the reducing agent aqueous solution in the step (4) is 2-10%.
Optionally, the separation in the step (6) is centrifugal separation, the rotation speed of the centrifugal separation is 2000-10000 rpm, and the time of the centrifugal separation is 10-30 min.
In yet another aspect, the present application provides the use of the above multifunctional drilling treatment agent as a drilling fluid additive;
optionally, the multifunctional drilling treatment agent effectively combines the comprehensive effects of natural high-molecular products of starch, cellulose and polymer products, and has the functions of cutting, tackifying, reducing filtration, inhibiting coating and the like.
The multifunctional drilling treatment agent provided by the application is combined with the comprehensive effects of natural high-molecular products such as starch, cellulose and polymer products, has excellent shear performance, can improve the suspension property and sand carrying property of drilling fluid, and can not greatly improve the apparent viscosity of the drilling fluid; has excellent filtrate loss reducing performance and good temperature and salt resisting effect, and can resist the temperature of over 120 ℃ in a saturated brine and seawater drilling fluid system. The multifunctional drilling treatment agent has excellent filtration loss reduction performance under the conditions of high temperature and high pressure, seawater, saturated brine and the like, can effectively reduce the filtration loss of drilling fluid, and is suitable for drilling engineering under different complex operating environments; meanwhile, the coating inhibition performance is good, the clay and the drill cuttings can be effectively coated, and solid-phase pollution is prevented. The product adopts a special dispersion polymerization process, has high polymerization degree and high purity, has the main structure of most natural starch and cellulose polymers, still has the degradability of the natural polymers, is environment-friendly, nontoxic and pollution-free, is a product with excellent comprehensive performance, has multiple functions, simplifies the adjustment and maintenance process of the drilling fluid on site, meets the requirements of maintenance and treatment of the drilling fluid, can meet the environmental requirements of land operation and offshore operation, and has wide application prospect in the drilling engineering. It is especially suitable for large displacement well and solid-free drilling fluid.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and methods described in the specification.
Detailed Description
The embodiments of the present application will be described in detail to make the objects, technical solutions and advantages of the present application more apparent. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The embodiment of the application provides a multifunctional drilling treatment agent which is prepared by adopting a dispersion polymerization process and by graft copolymerization of starch and cellulose with acrylamide under the action of an initiator.
In embodiments of the present application, the initiator comprises an oxidizing agent and a reducing agent; the multifunctional drilling treatment agent comprises raw materials and a solvent, wherein the raw materials of the multifunctional drilling treatment agent comprise the following components in percentage by mass: 30-80% of starch, 10-40% of cellulose, 5-45% of acrylamide, 0-15% of double bond-containing water-soluble compound monomer, optionally 0.5-15%, 0.5-5% of oxidizing agent, 0.5-5% of reducing agent and 0.5-5% of dispersion stabilizer. Alternatively, the double bond-containing water-soluble compound monomer may not be added.
Preferably, the raw materials of the multifunctional drilling treatment agent comprise the following components in percentage by mass: 40-70% of starch, 15-35% of cellulose, 10-35% of acrylamide, 2-10% of double-bond water-soluble compound monomer, 1-2% of oxidant, 1-2% of reducer and 1-3% of dispersion stabilizer.
Optionally, the raw materials of the multifunctional well drilling treatment agent consist of starch, cellulose, acrylamide, double bond-containing water-soluble compound monomer, an oxidizing agent, a reducing agent and a dispersion stabilizer.
In the embodiment of the application, the double bond-containing water-soluble compound monomer is selected from one or more of aminoacrylic acid, aminoacrylic acid salt, styrene sulfonate and allyl quaternary ammonium salt; optionally, the monomer is selected from one or more of sodium N- (3-aminopropyl) methacrylate, diallyldimethylammonium chloride and sodium styrene sulphonate.
In the present examples, the oxidizing agent is selected from one or more of hydrogen peroxide, ammonium persulfate, potassium persulfate, and sodium persulfate;
in the examples herein, the reducing agent is selected from one or more of ferrous sulfate, sodium sulfite, and amine sulfite.
In the embodiment of the application, the dosage of the solvent is 1-5 times of the total weight of the raw materials of the multifunctional drilling treatment agent;
optionally, the solvent is selected from one or more of isopropanol, ethanol, ethylene glycol and propylene glycol;
preferably, the solvent consists of isopropanol and ethanol, the dosage of the solvent is 1.5-3 times of the total weight of the raw materials of the multifunctional drilling treatment agent, and the weight ratio of the isopropanol to the ethanol is (2:8) - (8: 2).
In the embodiment of the application, the starch is selected from one or more than two of pregelatinized starch, sulfonated starch, carboxymethyl starch and temperature-resistant starch;
optionally, the starch has a particle size of 60-120 mesh;
optionally, the cellulose is selected from one or more of hydroxypropyl cellulose, hydroxymethyl cellulose, polyanionic cellulose and sodium carboxymethyl cellulose.
In the present embodiment, the dispersion stabilizer is selected from one or more of polyethylene glycol, an anionic surfactant, and a cationic surfactant;
optionally, the dispersion stabilizer is selected from one or more of polyethylene glycol, alkyl sulfonate and quaternary ammonium salt.
In another aspect, embodiments of the present application provide a method for preparing the multifunctional drilling fluid, including:
(1) adding a solvent, acrylamide, starch, cellulose and a double-bond-containing water-soluble compound monomer into a reaction container, adding an oxidant and a dispersion stabilizer, and stirring until the components are completely dissolved;
(2) adjusting the pH value of the solution in the reaction container to 8-10;
(3) introducing protective gas into the reaction container;
(4) dropwise adding a reducing agent aqueous solution within 40-60 minutes;
(5) continuously stirring and reacting for 2-3 hours at the temperature of 30-50 ℃;
(6) separating the generated precipitate under the atmosphere of protective gas;
(7) and (3) drying the precipitate obtained in the step (6) at the temperature of 60-80 ℃ and the vacuum degree of 0.01-0.05MPa to obtain the multifunctional drilling treatment agent. Optionally, the preparation of the multifunctional well treatment agent consists of the steps described above.
In the embodiments of the present application, the shielding gas is selected from one or more of nitrogen, helium, and argon;
optionally, the mass concentration of the reducing agent aqueous solution in the step (4) is 2-10%.
Optionally, the separation in the step (6) is centrifugal separation, the rotation speed of the centrifugal separation is 2000-10000 rpm, and the time of the centrifugal separation is 10-30 min.
In the examples of the present application, the polyethylene glycol has a molecular weight of between 200 and 800 and is available from Haian petrochemical plant, PEG 600.
In the following examples the pregelatinized starch was purchased from pregelatinized starch alpha-starch from Ningjin county and energy saving materials, Inc.; convenient for dissolving, and the starch granules are 40-60 meshes.
The low viscosity polyanionic cellulose is purchased from Puyang oriental chemical plant, LV-CMC; the cellulose particles are 40-60 mesh.
In the following examples carboxymethyl starch is purchased from Puyang Tri-mechanical chemical plant, CMS, starch granule 40-60 mesh.
Example 1
The embodiment provides a multifunctional drilling treatment agent, which is prepared from the following raw materials in parts by weight: 51kg of carboxymethyl starch (CMS), 20kg of carboxymethyl cellulose (LV-CMC); 25kg of acrylamide and 1kg of sodium persulfate; 1kg of ferrous sulfate, 2kg of polyethylene glycol, 100kg of isopropanol and 100kg of ethanol.
The preparation method of the multifunctional drilling treatment agent comprises the following steps: adding 100kg of isopropanol and 100kg of ethanol into a reaction kettle, and stirring to uniformly mix the isopropanol and the ethanol to be used as a polymerization solvent for later use; adding 51kg of carboxymethyl starch, 20kg of carboxymethyl cellulose and 25kg of acrylamide into a reaction kettle, adding 1kg of sodium persulfate and 2kg of polyethylene glycol, and stirring until the raw materials are completely dissolved; dissolving 1kg of ferrous sulfate in 20kg of distilled water, stirring uniformly, and placing in a constant-pressure dropping funnel; adding 10 wt.% NaOH aqueous solution to adjust the pH value of the solution in the reaction kettle to 9-10; introducing nitrogen into the reaction kettle, and then beginning to dropwise add the ferrous sulfate aqueous solution within 40-60 minutes; keeping the nitrogen atmosphere, and stirring and reacting for 2 hours at 50 ℃; stopping the reaction, precipitating the generated polymer from the system, and carrying out centrifugal separation under the protection of nitrogen at a centrifugal speed of 5000-; then drying at 80 ℃ and 0.01-0.05MPa of vacuum degree, and crushing to obtain the product.
Example 2
The embodiment provides a multifunctional drilling treatment agent, which is prepared from the following raw materials in parts by weight: 51kg of carboxymethyl starch (CMS), 20kg of carboxymethyl cellulose (LV-CMC); 20kg of acrylamide, 5kg of N- (3-aminopropyl) sodium methacrylate and 1kg of sodium persulfate; 1kg of ferrous sulfate, 2kg of polyethylene glycol, 100kg of isopropanol and 100kg of ethanol.
The preparation method of the multifunctional drilling treatment agent comprises the following steps: adding 100kg of isopropanol and 100kg of ethanol into a reaction kettle, and stirring to uniformly mix the isopropanol and the ethanol to be used as a polymerization solvent for later use; adding 51kg of carboxymethyl starch, 20kg of carboxymethyl cellulose, 20kg of acrylamide and 5kg of double-bond-containing water-soluble compound monomer sodium N- (3-aminopropyl) methacrylate into a reaction kettle, adding 1kg of sodium persulfate and 2kg of polyethylene glycol, and stirring until the raw materials are completely dissolved; dissolving 1kg of ferrous sulfate in 20kg of distilled water, stirring uniformly, and placing in a constant-pressure dropping funnel; adding 10 wt.% NaOH aqueous solution to adjust the pH value of the solution in the reaction kettle to 9-10; introducing nitrogen into the reaction kettle, and then beginning to dropwise add the ferrous sulfate aqueous solution within 40-60 minutes; keeping the nitrogen atmosphere, and stirring and reacting for 2 hours at 50 ℃; stopping the reaction, precipitating the generated polymer from the system, and carrying out centrifugal separation under the protection of nitrogen at a centrifugal speed of 5000-; then drying at 80 ℃ and 0.01-0.05MPa of vacuum degree, and crushing to obtain the product.
Example 3
The embodiment provides a multifunctional drilling treatment agent, which is prepared from the following raw materials in parts by weight: 51kg of carboxymethyl starch (CMS), 20kg of carboxymethyl cellulose (LV-CMC); 20kg of acrylamide, 5kg of diallyl dimethyl ammonium chloride and 1kg of sodium persulfate; 1kg of ferrous sulfate, 2kg of polyethylene glycol, 100kg of isopropanol and 100kg of ethanol.
The preparation method of the multifunctional drilling treatment agent comprises the following steps: adding 100kg of isopropanol and 100kg of ethanol into a reaction kettle, and stirring to uniformly mix the isopropanol and the ethanol to be used as a polymerization solvent for later use; adding 51kg of carboxymethyl starch, 20kg of carboxymethyl cellulose, 20kg of acrylamide and 5kg of double-bond-containing water-soluble compound monomer diallyl dimethyl ammonium chloride into a reaction kettle, adding 1kg of sodium persulfate and 2kg of polyethylene glycol, and stirring until the raw materials are completely dissolved; dissolving 1kg of ferrous sulfate in 20kg of distilled water, stirring uniformly, and placing in a constant-pressure dropping funnel; adding 10 wt.% NaOH aqueous solution to adjust the pH value of the solution in the reaction kettle to 9-10; introducing nitrogen into the reaction kettle, and then beginning to dropwise add the ferrous sulfate aqueous solution within 40-60 minutes; keeping the nitrogen atmosphere, and stirring and reacting for 2 hours at 50 ℃; stopping the reaction, precipitating the generated polymer from the system, and carrying out centrifugal separation under the protection of nitrogen at a centrifugal speed of 5000-; then drying at 80 ℃ and 0.01-0.05MPa of vacuum degree, and crushing to obtain the product.
Example 4
The embodiment provides a multifunctional drilling treatment agent, which is prepared from the following raw materials in parts by weight: 64kg of carboxymethyl starch (CMS), 20kg of carboxymethyl cellulose (LV-CMC); 10kg of acrylamide, 2kg of N- (3-aminopropyl) sodium methacrylate and 1kg of ammonium persulfate; 1kg of ferrous sulfate, 2kg of polyethylene glycol, 100kg of isopropanol and 100kg of ethanol.
The preparation method of the multifunctional drilling treatment agent comprises the following steps: adding 100kg of isopropanol and 100kg of ethanol into a reaction kettle, and stirring to uniformly mix the isopropanol and the ethanol to be used as a polymerization solvent for later use; adding 64kg of carboxymethyl starch, 20kg of carboxymethyl cellulose, 10kg of acrylamide and 2kg of double-bond-containing water-soluble compound monomer sodium N- (3-aminopropyl) methacrylate into a reaction kettle, adding 1kg of ammonium persulfate and 2kg of polyethylene glycol, and stirring until the raw materials are completely dissolved; dissolving 1kg of ferrous sulfate in 20kg of distilled water, stirring uniformly, and placing in a constant-pressure dropping funnel; adding 10 wt.% NaOH aqueous solution to adjust the pH value of the solution in the reaction kettle to 9-10; introducing nitrogen into the reaction kettle, and then beginning to dropwise add the ferrous sulfate aqueous solution within 40-60 minutes; keeping the nitrogen atmosphere, and stirring and reacting for 2 hours at 50 ℃; stopping the reaction, precipitating the generated polymer from the system, and carrying out centrifugal separation under the protection of nitrogen at a centrifugal speed of 5000-; then drying at 80 ℃ and 0.01-0.05MPa of vacuum degree, and crushing to obtain the product.
Example 5
The embodiment provides a multifunctional drilling treatment agent, which is prepared from the following raw materials in parts by weight: 41kg of carboxymethyl starch (CMS), 15kg of carboxymethyl cellulose (LV-CMC); 30kg of acrylamide, 10kg of sodium N- (3-aminopropyl) methacrylate and 1kg of hydrogen peroxide; 1kg of ferrous sulfate, 2kg of sodium dodecyl sulfate, 100kg of glycol and 100kg of ethanol.
The preparation method of the multifunctional drilling treatment agent comprises the following steps: firstly, 100kg of ethylene glycol and 100kg of ethanol are added into a reaction kettle, and are stirred to be uniformly mixed to be used as a polymerization solvent for standby; adding 41kg of carboxymethyl starch, 15kg of carboxymethyl cellulose, 30kg of acrylamide and 30kg of sodium N- (3-aminopropyl) methacrylate which is a double-bond-containing water-soluble compound monomer into a reaction kettle, adding 1kg of hydrogen peroxide and 2kg of sodium dodecyl sulfate, and stirring until the raw materials are completely dissolved; dissolving 1kg of ferrous sulfate in 20kg of distilled water, stirring uniformly, and placing in a constant-pressure dropping funnel; adding 10 wt.% NaOH aqueous solution to adjust the pH value of the solution in the reaction kettle to 9-10; introducing nitrogen into the reaction kettle, and then beginning to dropwise add the ferrous sulfate aqueous solution within 40-60 minutes; keeping the nitrogen atmosphere, and stirring and reacting for 2 hours at 50 ℃; stopping the reaction, precipitating the generated polymer from the system, and carrying out centrifugal separation under the protection of nitrogen at a centrifugal speed of 5000-; then drying at 80 ℃ and 0.01-0.05MPa of vacuum degree, and crushing to obtain the product.
Example 6
The embodiment provides a multifunctional drilling treatment agent, which is prepared from the following raw materials in parts by weight: 51kg of pregelatinized starch (alpha-starch), 20kg of low-viscosity polyanionic cellulose (LV-PAC); 20kg of acrylamide, 5kg of sodium styrene sulfonate and 1kg of hydrogen peroxide; 1kg of sodium sulfite, 2kg of polyethylene glycol and 400kg of ethanol.
The preparation method of the multifunctional drilling treatment agent comprises the following steps: adding 400kg of ethanol into a reaction kettle, and stirring to uniformly mix the ethanol and the ethanol to be used as a polymerization solvent for later use; adding 51kg of pregelatinized starch (alpha-starch), 20kg of low-viscosity polyanionic cellulose (LV-PAC), 20kg of acrylamide and 5kg of double-bond-containing water-soluble compound monomer sodium styrene sulfonate into a reaction kettle, adding 1kg of hydrogen peroxide and 2kg of polyethylene glycol, and stirring until the raw materials are completely dissolved; dissolving 1kg of sodium sulfite in 20kg of distilled water, stirring uniformly, and placing in a constant-pressure dropping funnel; adding 10 wt.% NaOH aqueous solution to adjust the pH value of the solution in the reaction kettle to 9-10; introducing nitrogen into the reaction kettle, and then beginning to dropwise add the sodium sulfite aqueous solution within 40-60 minutes; keeping the nitrogen atmosphere, and stirring and reacting for 2 hours at 50 ℃; stopping the reaction, precipitating the generated polymer from the system, and carrying out centrifugal separation under the protection of nitrogen at a centrifugal speed of 5000-; then drying at 80 ℃ and 0.01-0.05MPa of vacuum degree, and crushing to obtain the product.
Example 7
The embodiment provides a multifunctional drilling treatment agent, which is prepared from the following raw materials in parts by weight: 86kg of carboxymethyl starch (CMS), 8kg of carboxymethyl cellulose (LV-CMC); 2kg of acrylamide, 1kg of sodium N- (3-aminopropyl) methacrylate and 1kg of sodium persulfate; 1kg of ferrous sulfate, 2kg of polyethylene glycol, 100kg of isopropanol and 100kg of ethanol.
The preparation method of the multifunctional drilling treatment agent comprises the following steps: adding 100kg of isopropanol and 100kg of ethanol into a reaction kettle, and stirring to uniformly mix the isopropanol and the ethanol to be used as a polymerization solvent for later use; adding 85kg of starch, 8kg of cellulose, 2kg of acrylamide and 1kg of double-bond-containing water-soluble compound monomer sodium N- (3-aminopropyl) methacrylate into a reaction kettle, adding 1kg of sodium persulfate and 2kg of polyethylene glycol, and stirring until the raw materials are completely dissolved; dissolving 1kg of ferrous sulfate in 20kg of distilled water, stirring uniformly, and placing in a constant-pressure dropping funnel; adding 10 wt.% NaOH aqueous solution to adjust the pH value of the solution in the reaction kettle to 9-10; introducing nitrogen into the reaction kettle, and then beginning to dropwise add the ferrous sulfate aqueous solution within 40-60 minutes; keeping the nitrogen atmosphere, and stirring and reacting for 2 hours at 50 ℃; stopping the reaction, precipitating the generated polymer from the system, and carrying out centrifugal separation under the protection of nitrogen at a centrifugal speed of 5000-; then drying at 80 ℃ and 0.01-0.05MPa of vacuum degree, and crushing to obtain the product.
Example 8
The embodiment provides a multifunctional drilling treatment agent, which is prepared from the following raw materials in parts by weight: 16kg of carboxymethyl starch (CMS), 5kg of carboxymethyl cellulose (LV-CMC); 50kg of acrylamide, 25kg of N- (3-aminopropyl) sodium methacrylate and 1kg of sodium persulfate; 1kg of ferrous sulfate, 2kg of polyethylene glycol, 100kg of isopropanol and 100kg of ethanol.
The preparation method of the multifunctional drilling treatment agent comprises the following steps: adding 100kg of isopropanol and 100kg of ethanol into a reaction kettle, and stirring to uniformly mix the isopropanol and the ethanol to be used as a polymerization solvent for later use; adding 16kg of starch, 5kg of cellulose, 50kg of acrylamide and 25kg of double-bond-containing water-soluble compound monomer sodium N- (3-aminopropyl) methacrylate into a reaction kettle, adding 1kg of sodium persulfate and 2kg of polyethylene glycol, and stirring until the raw materials are completely dissolved; dissolving 1kg of ferrous sulfate in 20kg of distilled water, stirring uniformly, and placing in a constant-pressure dropping funnel; adding 10 wt.% NaOH aqueous solution to adjust the pH value of the solution in the reaction kettle to 9-10; introducing nitrogen into the reaction kettle, and then beginning to dropwise add the ferrous sulfate aqueous solution within 40-60 minutes; keeping the nitrogen atmosphere, and stirring and reacting for 2 hours at 50 ℃; stopping the reaction, precipitating the generated polymer from the system, and carrying out centrifugal separation under the protection of nitrogen at a centrifugal speed of 5000-; then drying at 80 ℃ and 0.01-0.05MPa of vacuum degree, and crushing to obtain the product.
Comparative example 1
The comparative example provides a multifunctional drilling treatment agent, which is prepared from the following raw materials in parts by weight: 71kg of carboxymethyl starch (CMS), 25g of N- (3-aminopropyl) sodium methacrylate, 1kg of ferrous sulfate, 2kg of polyethylene glycol, 100kg of isopropanol and 100kg of ethanol.
The preparation method of the multifunctional drilling treatment agent comprises the following steps: adding 100kg of isopropanol and 100kg of ethanol into a reaction kettle, and stirring to uniformly mix the isopropanol and the ethanol to be used as a polymerization solvent for later use; adding 71kg of starch and 25g N- (3-aminopropyl) sodium methacrylate into a reaction kettle, adding 1kg of sodium persulfate and 2kg of polyethylene glycol, and stirring until the raw materials are completely dissolved; dissolving 1kg of ferrous sulfate in 20kg of distilled water, stirring uniformly, and placing in a constant-pressure dropping funnel; adding 10 wt.% NaOH aqueous solution to adjust the pH value of the solution in the reaction kettle to 9-10; introducing nitrogen into the reaction kettle, and then beginning to dropwise add the ferrous sulfate aqueous solution within 40-60 minutes; keeping the nitrogen atmosphere, and stirring and reacting for 2 hours at 50 ℃; stopping the reaction, precipitating the generated polymer from the system, and carrying out centrifugal separation under the protection of nitrogen at a centrifugal speed of 5000-; then drying at 80 ℃ and 0.01-0.05MPa of vacuum degree, and crushing to obtain the product.
Comparative example 2
Selecting 50kg of carboxymethyl starch (CMS) and 25kg of carboxymethyl cellulose (LV-CMC); 25kg of polyacrylamide (molecular weight 50-90 ten thousand) is directly mixed.
Test example:
the products from examples 1-8 and comparative examples 1-2 were tested according to drilling fluid API 13A standard, clauses 16.3 and 16.4, and the products from examples 1-6 accounted for 0.75 wt.% of the entire test system, with the properties shown in table 1:
TABLE 1 Performance indices of the multifunctional drilling treatment agent
Note: the samples are hot rolled for 16h at 120 ℃ before testing and then tested at normal temperature.
The products provided by the embodiments 1 to 8 combine the comprehensive effects of natural polymer products, namely starch, cellulose and polymer products, have excellent shear performance, can improve the suspension property and sand carrying property of the drilling fluid, and can not greatly improve the apparent viscosity of the drilling fluid; the filtrate loss reducing performance is excellent, and the temperature and salt resistance effect is good; meanwhile, the coating inhibition performance is good, clay and drill cuttings can be effectively coated, solid-phase pollution is prevented, the temperature resistance is higher than 120 ℃ in a saturated salt water and seawater drilling fluid system, the cutting capacity is very strong, the influence on the apparent viscosity of the drilling fluid is limited, and the coating inhibition effect can be achieved. Meanwhile, the main structure of the product is starch and cellulose, so that the product is easy to degrade, non-toxic and pollution-free, belongs to an environment-friendly product, has excellent comprehensive performance, can meet the requirements of maintenance and treatment of the current on-site drilling fluid, has a very wide application prospect, and is particularly suitable for extended reach wells and solid-free drilling fluids.
It is to be understood that the above embodiments are merely exemplary embodiments that are employed to illustrate the principles of the present application, and that the present application is not limited thereto. It will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the application, and these changes and modifications are to be considered as the scope of the application.
Claims (10)
1. A multifunctional drilling treating agent is prepared from starch and cellulose through graft copolymerization with acrylamide under the action of trigger by dispersing polymerization process.
2. The multifunctional well treatment agent of claim 1, wherein the initiator comprises an oxidizing agent and a reducing agent; the multifunctional drilling treatment agent comprises raw materials and a solvent, wherein the raw materials of the multifunctional drilling treatment agent comprise the following components in percentage by mass: 30-80% of starch, 10-40% of cellulose, 5-45% of acrylamide, 0-15% of double bond-containing water-soluble compound monomer, optionally 0.5-15%, 0.5-5% of oxidizing agent, 0.5-5% of reducing agent and 0.5-5% of dispersion stabilizer.
3. The multifunctional well drilling treatment agent of claim 2, wherein the raw materials of the multifunctional well drilling treatment agent comprise, in mass fractions:
40-70% of starch, 15-35% of cellulose, 10-35% of acrylamide, 2-10% of double-bond water-soluble compound monomer, 1-2% of oxidant, 1-2% of reducer and 1-3% of dispersion stabilizer.
4. A multifunctional well treatment agent according to claim 2 or 3, wherein the double bond-containing water-soluble compound monomer is selected from one or more of aminoacrylic acid, aminoacrylic acid salt, styrene sulfonate and allylic quaternary ammonium salt;
optionally, the oxidizing agent is selected from one or more of hydrogen peroxide, ammonium persulfate, potassium persulfate, and sodium persulfate;
optionally, the reducing agent is selected from one or more of ferrous sulfate, sodium sulfite, and amine sulfite.
5. The multifunctional well drilling treatment agent according to claim 2 or 3, wherein the solvent is used in an amount of 1-5 times of the sum of the raw material weights of the multifunctional well drilling treatment agent,
optionally, the solvent is selected from one or more of isopropanol, ethanol, ethylene glycol and propylene glycol;
preferably, the solvent consists of isopropanol and ethanol, the dosage of the solvent is 1.5-3 times of the total weight of the raw materials of the multifunctional drilling treatment agent, and the weight ratio of the isopropanol to the ethanol is (2:8) - (8: 2).
6. A multifunctional well drilling treatment agent according to claim 2 or 3, wherein the starch is selected from one or more of pregelatinized starch, sulfonated starch, carboxymethyl starch and temperature resistant starch;
optionally, the starch has a particle size of 60-120 mesh;
optionally, the cellulose is selected from one or more of hydroxypropyl cellulose, hydroxymethyl cellulose, polyanionic cellulose and sodium carboxymethyl cellulose.
7. A multifunctional well treatment agent according to claim 2 or 3, wherein the dispersion stabilizer is selected from one or more of polyethylene glycol, anionic surfactant and cationic surfactant;
optionally, the dispersion stabilizer is selected from one or more of polyethylene glycol, alkyl sulfonate and quaternary ammonium salt.
8. The method of making a multifunctional well treatment agent of any of claims 2 to 7, comprising:
(1) adding a solvent, acrylamide, starch, cellulose and a double-bond-containing water-soluble compound monomer into a reaction container, adding an oxidant and a dispersion stabilizer, and stirring until the components are completely dissolved;
(2) adjusting the pH value of the solution in the reaction container to 8-10;
(3) introducing protective gas into the reaction container;
(4) dropwise adding a reducing agent aqueous solution within 40-60 minutes;
(5) continuously stirring and reacting for 2-3 hours at the temperature of 30-50 ℃;
(6) separating the generated precipitate under the atmosphere of protective gas;
(7) and (3) drying the precipitate obtained in the step (6) at the temperature of 60-80 ℃ and the vacuum degree of 0.01-0.05MPa to obtain the multifunctional drilling treatment agent.
9. The method of claim 8, wherein the shielding gas is selected from one or more of nitrogen, helium and argon;
optionally, the mass concentration of the reducing agent aqueous solution in the step (4) is 2-10%.
10. Use of the multifunctional drilling treatment agent of any one of claims 1 to 7 as a drilling fluid additive.
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