21results about How to "Good filter loss reduction effect" patented technology

The invention provides a temperature-resistant and salt-resistant cross-linking tackifying filtrate reducer for a soil-phase-free water-based drilling fluid as well as a preparation method and application of the temperature-resistant and salt-resistant cross-linking tackifying filtrate reducer, and belongs to the technical field of drilling. The temperature-resistant and salt-resistant cross-linking tackifying filtrate reducer for the soilless phase water-based drilling fluid comprises the following raw materials in parts by weight: N, N-dimethylformamide, a cross-linking agent and a cross-linking agent, the invention relates to a water-based adhesive which is prepared from the following components in parts by weight: 15 to 25 parts of N, N-dimethylacrylamide, 1 to 10 parts of 3-[(3-methacrylamidopropyl) dimethylammonium] propane-1-sulfonate, 1 to 10 parts of long-chain alkyl polyoxyethylene ether methacrylate, 0.005 to 0.015 part of macromolecular cross-linking agent, 0.03 to 0.08 part of initiator A and 80 to 100 parts of deionized water. The tackifying filtrate reducer can resist the temperature of 180 DEG C, can resist NaCl to be saturated, has excellent tackifying, shear-improving and filtrate-reducing effects under high-temperature and high-salt conditions, improves the rheological property and the filtrate-reducing property of drilling fluid, and ensures safe and efficient drilling of a deep well.

The invention relates to a preparation method and application of an inner-rigid outer-soft core-shell structure silicon dioxide blocking agent for marine drilling fluid, and belongs to the field of deepwater oil and gas drilling. N-vinyl-2-pyrrolidone, dimethyl diallyl ammonium chloride, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid are polymerized and grafted on the surface of nano silicon dioxide to form the silicon dioxide blocking agent with a core-shell structure and a rigid inside and a soft outside; by means of rigid plugging of a nano material and deformation filling flexible plugging of a high-molecular polymer, shale micro-nano pores are efficiently plugged with rigid inside and flexible outside, so that the stability of a well wall is maintained, meanwhile, secondary generation of hydrates is effectively inhibited, and the safety and efficiency of deepwater drilling are improved; the plugging agent provided by the invention reduces the demand on a large number of thermodynamic inhibitors, not only saves the cost, but also has the characteristic of environmental protection.

The invention relates to the field of oilfield chemical drilling fluid treatment agents, and discloses a chitosan grafted copolymer, a preparation method thereof and a drilling fluid, the chitosan grafted copolymer has a structure as shown in formula (I), and the number-average molecular weight is 200000-600000; m is 1200 to 3500, and X and Z are respectively and independently H or-R1COOM1 or a polymeric chain segment; wherein R1 is alkylene of C1-C5, and M1 is H, Na or K; the polymeric chain segment contains a structural unit A and a structural unit B, the structural unit A contains at least two-COOM2, M2 is H, Na or K, and the structural unit B contains a cyclic lactam structure; y is H or a quaternary ammonium salt structure with an ester group. The chitosan grafted copolymer provided by the invention has relatively good wall fixing performance and filtrate loss reduction performance, and ensures well wall stability of easy-to-collapse stratum of shale fracture zone from two aspects of wall fixing and filtrate invasion reduction, # imgabs0 #

The invention discloses a filtrate reducer based on modified humic acid and a preparation method of the filtrate reducer, and relates to the technical field of oilfield chemistry. The preparation method of the filtrate reducer comprises the following steps: taking modified humic acid, N, N-dimethylacrylamide, N-vinyl imidazole, long-chain acrylate and hydroxyethyl acrylate, dissolving in a solvent, then adding an initiator, and reacting to obtain the filtrate reducer, wherein during preparation of the modified humic acid, firstly, the modified humic acid is activated by low-concentration potassium permanganate, and then the activated modified humic acid reacts with methyl chlorosilane. The filtrate reducer prepared by the preparation method disclosed by the invention has relatively good temperature-resistant and salt-resistant performance and relatively good filtrate reduction performance. The preparation method is simple, the raw materials are simple and easy to obtain, the cost is low, and popularization is easy.

The invention relates to a filtrate reducer as well as a preparation method and application thereof. The filtrate reducer is prepared from the following raw materials: a combination of a polymeric monomer and a cross-linking agent, the polymeric monomer comprises a combination of alkenyl amide, alkenyl sulfonic acid, a rigid monomer and an alkenyl cationic monomer; the cross-linking agent has a structure as shown in a formula I; according to the invention, the raw materials for preparing the filtrate reducer are designed, so that the obtained filtrate reducer has high temperature resistance and salt resistance, also has better rheological property and filtrate reduction property, and can meet the requirements of technical development of high-temperature-resistant and salt-resistant drilling fluids.

The invention relates to the field of oilfield chemistry, and discloses a graphene oxide and polymer composite filtrate reducer for water-based drilling fluid and a preparation method of the graphene oxide and polymer composite filtrate reducer. The method specifically comprises the following steps: (1) adding graphene oxide powder into distilled water, stirring and performing ultrasonic treatment to obtain a graphene oxide aqueous solution for later use; (2) sequentially adding functional monomers, namely 2-acrylamide-2-methyl-1-propanesulfonic acid, 4-acryloylmorpholine and N, N-dimethylacrylamide into the graphene oxide aqueous solution for later use, and uniformly stirring; (3) adding ammonium persulfate and sodium hydrogen sulfite, heating in a water bath to a temperature required by reaction, and introducing nitrogen to wait for reaction; and (4) after the reaction is finished, washing with ethanol, drying, and crushing to obtain the graphene oxide and polymer composite filtrate reducer for the water-based drilling fluid. According to the invention, graphene oxide sheets are utilized to cover pores and polymer chains are utilized to connect bentonite particles, so that the water-based drilling fluid containing the filtrate reducer can resist the temperature of 220 DEG C, can resist salt by 15%, and can be applied to drilling of deep wells and ultra-deep wells.

The invention relates to the field of oil exploitation, and discloses a polyethyleneimine modified graphene oxide composite material which comprises polyethyleneimine and graphene oxide with polyfunctional groups, the total content of hydroxyl and carboxyl contained in the graphene oxide is 4-6 wt%; hydrogen bonds exist between nitrogen atoms of amino groups contained in the polyethyleneimine and oxygen atoms in the graphene oxide. The polyethyleneimine modified graphene oxide composite material provided by the invention has excellent hydration inhibition performance, filtration reduction performance and temperature resistance when being used as a water-based drilling fluid shale inhibitor.

This invention discloses a modified bentonite drilling mud, its preparation method, and its application, belonging to the technical field of drilling mud and geotechnical engineering materials. The modified bentonite drilling mud disclosed in this invention, by mass parts, comprises: 100 parts sodium-based bentonite, 0.5 parts anhydrous sodium carbonate, 1-5 parts gum arabic, 0.1-2 parts xanthan gum, and 1000 parts water. The modified bentonite drilling mud disclosed in this invention solves the technical problem that existing drilling muds are unable to simultaneously meet engineering performance requirements, be environmentally friendly, and possess good salt resistance.

This invention discloses an anti-collapse agent for drilling fluids, its preparation method, and its application. The raw materials for the anti-collapse agent include melamine, formaldehyde aqueous solution, organophosphonate, dilute sulfuric acid, water, epichlorohydrin, and a solid acid catalyst. The preparation method of the anti-collapse agent is as follows: 1) Melamine, formaldehyde aqueous solution, and water are mixed evenly, and the pH value of the mixed solution is adjusted to 8-9. Then, the mixture is heated to react and obtain material flow A; 2) Dilute sulfuric acid is introduced into material flow A to react and obtain material flow B; 3) Organophosphonate, solid acid catalyst, and epichlorohydrin are added to material flow B. After the reaction is completed, the mixture is separated and dried to obtain the anti-collapse agent. The anti-collapse agent for drilling fluids provided by this invention has good high-temperature resistance, good salt resistance, temperature resistance, wall solidification, and filtration loss reduction performance. It can meet the requirements of water-based mud anti-collapse and wall solidification in complex well conditions such as deep wells and high-salt brine wells, and extend the safe construction period.

The present invention belongs to the technical field of drilling fluids, and discloses a brine-based reservoir-specific drilling fluid and a preparation method thereof, wherein the brine-based reservoir-specific drilling fluid comprises 100 parts by weight of oilfield brine, 1-3 parts by weight of polyethyleneimine-modified cellulose, 1.5-2.8 parts by weight of lignin, and 1.4-2.2 parts by weight of anhydrous polyol; the modified cellulose of the present invention contains a long alkyl chain, which can form a unique hydrophobic association, and is conducive to improving the viscosity and shear resistance of the cellulose-based drilling fluid. The modified cellulose contains a large number of groups such as carboxyl and amino groups, which can be well adsorbed on the surface of bentonite silicate, inhibit the hydration of its grain surface, reduce the expansion of the crystal layer, and have better anti-swelling inhibition performance. The drilling fluid of the present invention has the advantages of small filtration loss and high heat rolling recovery rate, and shows good filtration loss reduction and high temperature resistance.

The invention discloses a preparation method of an environment-friendly salt-resistant and high-temperature-resistant filtrate reducer for a long open hole section. The preparation method specifically comprises the following steps: step 1, preparing a first mixed solution; step 2, preparing dispersion liquid; step 3, mixing the first mixed solution and the dispersion solution, and then shearing for 1-2 hours to obtain a shearing solution; step 4, adding the shear fluid into a reaction kettle, introducing nitrogen into the reaction kettle, discharging air in the reaction kettle, keeping the temperature at 70 DEG C, stirring for 10 minutes while keeping the temperature, adding an initiator, and stirring for 10-12 hours to obtain a reaction liquid; step 5, adding the reaction liquid into isopropanol according to a volume ratio of 1: 1.5, stirring for 40 minutes, standing for 2 hours, and filtering to obtain a reaction material; and step 6, washing the reaction material with absolute ethyl alcohol and methanol for 10 minutes respectively, and then drying to obtain the environment-friendly salt-resistant and high-temperature-resistant filtrate reducer for the long open hole section. The problem that an existing filtrate loss agent is poor in filtrate loss reduction performance in a long open hole section is solved.

The invention provides a filtrate reducer and an oil-based drilling fluid as well as a preparation method and application of the filtrate reducer and the oil-based drilling fluid. The preparation method of the filtrate reducer comprises the following steps: mixing acrylonitrile, isobutene and acetone, heating and stirring for a first reaction, and dropwise adding fuming sulfuric acid in the heating and stirring process to obtain a first mixture; mixing N-alkyl acrylamide with the first mixture, and heating for second reaction to obtain a second mixture; dimethylaminoethyl methacrylate and the second mixture are mixed and heated for a third reaction, and a third mixture is obtained; ethyl benzene, carbon tetrachloride and the third mixture are mixed and heated for a fourth reaction, and a fourth mixture is obtained; and extracting and washing the fourth mixture with absolute ethyl alcohol to obtain a white floccule, namely the filtrate reducer. The oil-based drilling fluid comprises an oil phase, bentonite, the filtrate reducer provided by the invention, a flow pattern regulator, a weighting agent and sodium hydroxide. The oil-based drilling fluid provided by the invention has good high-temperature drop filtration performance and is suitable for drilling of deep wells and ultra-deep wells.

The invention relates to the field of oil and gas resource drilling, and discloses an amphiphobic blocking agent and a preparation method thereof, a composition for preparing a water-based drilling fluid, an antifriction super-amphiphobic strong-blocking water-based drilling fluid and a preparation method thereof. The preparation method of the amphiphobic blocking agent comprises the following steps: (1) performing first mixing on hydrogen peroxide, carbon nanotubes and sulfuric acid with the concentration of more than 95 wt% to obtain a mixture I; (2) carrying out second mixing on water, ethanol, nano silicon dioxide and the mixture I to obtain a mixture II; and (3) carrying out third mixing on perfluorooctyltriethoxysilane and the mixture II, so as to obtain the amphiphobic blocking agent. The antifriction type super-amphiphobic strong-plugging water-based drilling fluid prepared by adopting the amphiphobic plugging agent provided by the invention can simultaneously have the properties of antifriction, resistance reduction and strong plugging, and provides long-term practical value and economic benefit for exploiting low-porosity and low-permeability compact periodic resources in the future.

This invention relates to a method for preparing and applying a core-shell structured silica plugging agent with a rigid inner structure and a flexible outer structure for marine drilling fluids, belonging to the field of deepwater oil and gas drilling. This invention uses N-vinyl-2-pyrrolidone, dimethyl diallyl ammonium chloride, acrylamide, and 2-acrylamide-2-methylpropanesulfonic acid polymerized and grafted onto the surface of nano-silica to form a core-shell structured silica plugging agent with a rigid inner structure and a flexible outer structure. By utilizing the rigid plugging of nanomaterials and the flexible plugging of polymer deformation, this method effectively seals the micro- and nano-pores of shale and mudstone, thereby maintaining wellbore stability. Simultaneously, it effectively inhibits the secondary formation of hydrates, improving the safety and efficiency of deepwater drilling. Furthermore, the plugging agent of this invention reduces the need for large amounts of thermodynamic inhibitors, saving costs and possessing environmentally friendly properties.

The present invention relates to the technical field of drilling fluid, and discloses a kind of fluid loss reducer for drilling fluid and its preparation method, the present invention is by adding quaternary ammonium salt modified polyurethane, silane polymer, 2-acrylamide-2-methylpropane sulfonic acid, calcium chloride solution, Tween 20 emulsifier, white oil into a stirrer, stirring, and obtaining the fluid loss reducer for drilling fluid after the end. The polyurethane structure in the quaternary ammonium salt modified polyurethane can form a dense film, which can not only effectively prevent the water in the drilling fluid from entering the formation, thereby protecting the reservoir and improving the drilling efficiency, but also plays a good fluid loss reduction effect. The quaternary ammonium salt group in the fluid loss reducer can effectively inhibit the hydration dispersion of clay through the interaction with clay particles, thereby reducing the occurrence of fluid loss phenomenon; the triazine group and silane group therein can be adsorbed on the surface of clay particles, forming a protective film, preventing flocculation and aggregation between clay particles, thereby maintaining the stability of the drilling fluid, and reducing the occurrence of fluid loss phenomenon.

The invention discloses a filtrate reducer based on an alkyl ketone polymer and a preparation method of the filtrate reducer, and relates to the technical field of oilfield chemistry. The preparation method comprises the following steps: dissolving 2-5 parts by weight of trimethyltrivinylcyclotrisiloxane in a solvent to prepare a solution a, dissolving 10-20 parts by weight of N, N-dimethylacrylamide, 3-8 parts by weight of N-vinyl pyrrolidone, 1-5 parts by weight of long-chain acrylate and 1-3 parts by weight of acrylonitrile in a solvent to prepare a solution b, dissolving an oil-soluble initiator in a solvent to prepare a solution c, and carrying out ultrasonic dispersion on the solution c to prepare a coating; and heating to an initiation temperature, dropwise adding the solution b and the solution c into the solution a for polymerization, and after polymerization is finished, separating and purifying to obtain the product. The filtrate reducer prepared by the preparation method disclosed by the invention has good temperature resistance and salt resistance and relatively good filtrate reduction performance; the filtrate reducer does not contain sulfo groups, and has good environmental protection performance.

The present invention provides a polycyclic polymer viscosity-enhancing fluid loss reducer for temperature-resistant and salt-resistant drilling fluid and its preparation method and application, belonging to the field of drilling technology. The viscosity-enhancing fluid loss reducer of the present invention includes the following raw materials in parts by mass: 8-10 parts of 2-acrylamido-2-methylpropanesulfonic acid, 15-17 parts of acrylamide, 4-6 parts of diallyldimethylammonium chloride, 2-4 parts of 1,8-ethylenenaphthalene, 9-13 parts of octavinyl POSS, 0.1-0.2 parts of initiator, 0.1-0.2 parts of Span 80, 0.1-0.2 parts of Tween 80, and 80-120 parts of deionized water. The viscosity-enhancing fluid loss reducer of the present invention can effectively reduce the drilling fluid loss, increase the drilling fluid viscosity and maintain the rheological stability of the drilling fluid under high temperature and high salt conditions, and can be applied to oil and gas drilling in deep high-salt formations.

The invention provides a quinary random copolymer, a preparation method thereof, a filtrate reducer and a water-based drilling fluid. The five-membered random copolymer is formed by carrying out free radical copolymerization on 2-acrylamido-2-methyl-1-propanesulfonic acid, dimethyl diallyl ammonium chloride, N-vinyl caprolactam, N-alkenyl amide and an alkenyl heterocyclic compound. The invention also provides a preparation method of the pentabasic random copolymer, a filtrate reducer containing the pentabasic random copolymer and a water-based drilling fluid containing the filtrate reducer. The pentabasic random copolymer provided by the invention has the characteristics of high temperature resistance and salt resistance as a filtrate reducer, and has lower filter loss in fresh water slurry or saline water.

The invention provides a method for preparing water-based drilling fluid by using slickwater fracturing flow-back fluid as slurry preparation water, which comprises the following steps: filtering the slickwater fracturing flow-back fluid, adjusting the pH value, adding a destabilizing agent, a flocculating agent and a chelating agent into the slickwater fracturing flow-back fluid, stirring, standing for layering, taking supernatant liquid, and adding a defoaming agent, a decolorizing agent and a sterilizing agent into the supernatant liquid to obtain the slurry preparation water; and adding the slurry preparation water, the macromolecular coating agent FA-367, the glycan treating agent and the weighting material into the drilling fluid base slurry to obtain the water-based drilling fluid. Wherein the mass ratio of the slickwater fracturing flow-back fluid to the destabilizing agent to the flocculating agent to the chelating agent to the defoaming agent to the decolorizing agent to the sterilizing agent is 1.0: (0.5-1.0): (0.5-2.0): (1.0-3.0): (0.1-0.5): (0.5-2.0): (0.1-1.0). The water-based drilling fluid system with strong inhibition, low friction resistance and high performance obtained by the invention has good rheological property, filtrate loss reduction property, inhibition property and lubricity. And the whole treatment process simultaneously meets the engineering requirements of resource utilization of the slickwater fracturing flow-back fluid and well drilling, and has a good application prospect.

The invention discloses a fluid loss additive for drilling fluid and a preparation method thereof, and relates to the technical field of fluid loss reduction of drilling fluid. The invention relates to a filtrate reducer for drilling fluid. Comprising the following components in percentage by weight: 7%-15% of acrylamide, 4%-8% of 2-acrylamide-2-methylpropanesulfonic acid, 4%-8% of N-vinyl pyrrolidone, 2%-6% of acryloyloxyethyl trimethyl ammonium chloride, 0.8%-1.6% of a phenolic aldehyde composite cross-linking agent, 0.2%-0.8% of a zircon salt cross-linking agent, 0.1%-0.6% of an initiator, 0.3%-0.9% of an emulsifier and the balance of water. 3%-8% of hybrid zirconium diboride whiskers, 6%-16% of polyvinyl alcohol and the balance of water. The filtrate reducer disclosed by the invention can be firmly adsorbed with clay particles, shows good high-temperature and high-salt resistance and filtrate reduction performance, can resist the temperature up to 220 DEG C, can resist NaCl to be saturated, can resist Mg < 2 + > up to 20000 mg / L or above, and can resist Ca < 2 + > up to 40000 mg / L or above.

The invention relates to the technical field of well drilling, in particular to a nano plugging agent, a preparation method thereof and a drilling fluid system. The nano blocking agent disclosed by the invention is prepared from the following components: modified nano silicon dioxide, azodiisobutyronitrile, N, N-dimethylacrylamide, methylallyl alcohol polyoxyethylene ether and alkyl methacrylate. Wherein the mass of the azodiisobutyronitrile is 0.5 to 2 percent of the mass of the modified nano silicon dioxide; the mass ratio of the N, N-dimethylacrylamide to the modified nano silicon dioxide is (1-2): 2; the mass ratio of the methylallyl alcohol polyoxyethylene ether to the modified nano silicon dioxide is (2-3): 2; the mass ratio of the alkyl methacrylate to the modified nano silicon dioxide is (2-3): 2. The nano plugging agent provided by the invention can overcome the defects of insufficient ultra-high temperature resistance and salt resistance of the existing plugging agent.