30results about How to "High ratio of dynamic plastic" patented technology

The invention relates to a dimer acid-organic amine copolymer which comprises a structural unit from dimer acid, a structural unit from alkylamine and a structural unit from aromatic amine, wherein the dimer acid is an oleic acid-linoleic acid dimer; the alkylamine is one or more of C10-C20 alkyl primary amines, and the aromatic amine is aniline and one or more of anilines of which the benzene ring is subjected to single-point substitution or multipoint substitution by C1-C3 alkyl. The invention also relates to a preparation method of the dimer acid-organic amine copolymer, application of the dimer acid-organic amine copolymer as a shear strength improving agent, a water-in-oil emulsified drilling fluid shear strength improving agent, and a drilling fluid containing the shear strength improving agent. The shear strength improving agent provided by the invention can obviously enhance the dynamic shear force, dynamic plastic ratio and static shear force of the water-in-oil emulsified drilling fluid under the condition of lower consumption, and can be used in the water-in-oil emulsified drilling fluid which contains or does not contain organic soil.

The invention provides a weak gel system for a drilling fluid. The weak gel system is characterized by comprising the following components in different proportions: clear water, sodium hydroxide, sodium carbonate, an inhibitor, a filtrate reducer, a tackifier, a blocking agent, a viscosity reducer, a dispersant, a zwitter-ion viscosity reducer, a weak gel and a blocking lubricant. The weak gel system for the drilling fluid is a special drilling fluid system provided for horizontal well section drilling operation and obtained by optimization and modification on the basis of the existing horizontal well section drilling operation system. The weak gel system for the drilling fluid has unique rheological property, and is capable of effectively controlling the invasion depth of a solid-liquid relative reservoir stratum and reducing the damage to the reservoir stratum to the utmost extent; and as a result, the problems of static sand suspension and dynamic sand carrying of the drilling fluid in the horizontal well section drilling process can be solved.

The invention relates to a high temperature resistant shear strength improving agent for a water-based drilling fluid and a preparation method thereof in the field of petroleum drilling working fluids. The high temperature resistant shear strength improving agent for a water-based drilling fluid comprises the following copolymerized components in percentage by weight: (1) 40%-80% of monomer A; (2)10%-20% of monomer B; (3) 5%-20% of monomer C; (4) 5%-20% of monomer D, wherein the monomer A is at least one selected from acrylamide, N, N-dimethylacrylamide, isobutyl acrylamide and acrylonitrile;the monomer B is selected from N-vinyl pyrrolidone; the monomer C is at least one selected from methacryloyloxyethyl trimethyl ammonium chloride and dimethyl diallyl ammonium chloride; and the monomer D is selected from amphiphilic macromolecular monomer C18PEGMA. The high temperature resistant shear strength improving agent for a water-based drilling fluid disclosed in the invention has good shear strength improving performance and good temperature resistance, with the capability of resisting a temperature of up to 150 DEG C, and thus can be used as the shear strength improving agent for a petroleum drilling working fluid so as to improve the suspension stabilizing capability of the working fluid on a lightening admixture or a weighting admixture and enhance the cuttings carrying capacity and the borehole cleaning capability of the system.

The invention relates to a shearing-potentiation organic soil for drilling, belonging to the technical field of organobentonite modification in petrochemical industry. The preparation method comprises the following steps: preparing required amounts of bentonite, sodium carbonate, sodium hydroxide or potassium hydroxide into a bentonite suspension; preparing a bis-quaternary ammonium salt cationic surfactant, an auxiliary dispersant, a nonionic surfactant, white oil and water into a composite modifier emulsion; stirring with tetrabutylammonium bromide and other secondary modifiers at 60-80 DEG C for 60-120 minutes, drying, and pulverizing to obtain the shearing-potentiation organic soil for drilling. The shearing-potentiation organic soil for drilling has the advantages of favorable shearing-potentiation effect and high ratio of dynamic shear force, is more suitable to be used in an all-oil-base low-solid drilling fluid system, has favorable suspension and cutting carrying effects.

The invention relates to an oil-based drilling fluid for development drilling of a shale gas, and belongs to the technical field of drilling fluids for petroleum drilling engineering. The oil-based drilling fluid is characterized by being prepared from the following components by weight percent: 0.2% to 2% of main emulsifier, 0.1% to 1% of auxiliary emulsifier, 0% to 1.5% of wetting agent, 0.2% to 1.5% of alkalinity regulating agent, 0% to 1.5% of organic soil, 0% to 1.5% of tackifier, 0.2% to 2% of filtrate reducer, 0% to 80% of weighting agent, 0% to 20% of water phase and the balance of oil phase. The oil-based drilling fluid can be used for meeting a special requirement of the shale gas drilling to the drilling fluid, and is good in stability, inhibitory capability and lubricity even under low and high temperatures. The oil-based drilling fluid has the characteristics of high dynamic plastic ratio, low plastic viscosity, wide application range and good economic benefit.

The invention relates to a water-based drilling fluid anti-high temperature viscosity-increasing and shearing-lifting agent in the technical field of oilfield drilling fluid, a preparation method thereof and drilling fluid. The water-based drilling fluid anti-high temperature viscosity increasing and cutting agent is starch microgel; the average particle diameter of the starch microgel is 100-500nm, preferably 100-300nm, more preferably 100-200nm; the starch microgel Microgels are preferably spherical particles. The high temperature resistant soil-free water-based drilling fluid of the present invention uses the starch microgel as a high-temperature viscosity-increasing and shearing agent, which overcomes the temperature resistance of the conventional viscosity-increasing and shearing agents in the existing soil-free water-based drilling fluid. The problem of insufficient performance. The drilling fluid containing the viscosity-increasing and shear-increasing agent of the present invention can play a good role in increasing viscosity and increasing shear at a high temperature of 150°C, so that the clay-free drilling fluid system can be applied to horizontal wells with a well temperature of about 150°C, and has a good application prospects.

The invention discloses an isolating and temporary-plugging well-repair working fluid for an offshore oilfield and a preparation method for the isolating and temporary-plugging well-repair working fluid. The working fluid consists of water, sodium dodecyl benzene sulfonate, fatty alcohol polyoxyethylene ether sodium sulphate, sodium carboxymethyl starch, sodium carboxymethyl cellulose and sodium trimetaphosphate. A mass part ratio of the water to the sodium dodecyl benzene sulfonate to the fatty alcohol polyoxyethylene ether sodium sulphate to the sodium carboxymethyl starch to the sodium carboxymethyl cellulose to the sodium trimetaphosphate is 1000 to (2-4) to (2-4) to (20-25) to (3-5) to (15-25). The isolating and temporary-plugging well-repair working fluid for the offshore oilfield provided by the invention has the characteristics of great viscosity, a high dynamic plastic ratio, good stability of a well-repair liquid system, moderate formation plugging capacity, easy flow-back and the like, so that the problem that the formation is plugged by cement is avoided, and the defect that gel flow-back needs gel breaking and is limited in effect is overcome. In use, the isolating and temporary-plugging well-repair working fluid for the offshore oilfield has the advantages of small dosage, simple site construction, small reservoir damages, and the like.

The invention discloses clean drilling fluid used for a coal bed gas multi-branch horizontal well storage layer and a preparation method of the clean drilling fluid. The drilling fluid consists of the following materials in parts by weight: 100 parts of clear water, 0.5-1 part of a gelatinizing agent, 0.5-1 part of gelatinizing aid, and 0.1-0.2 part of a high temperature stabilizer, wherein the gelatinizing agent is composed of hexadecyl trimethyl ammonium bromide and cetyl pyridinium chloride monohydrate in a weight ratio of 4:1; the gelatinizing aid is composed of sodium salicylate and potassium chloride in a weight ratio of 1:1; the high temperature stabilizer is sodium thiosulfate. The drilling liquid does not use bentonite or polymer to improve viscosity, but uses micromolecule surfactant to form a micelle for increasing viscosity, is good in rock carrying capacity, quick and complete to break glue, and capable of guaranteeing a well hole to be clean while protecting the coal bed gas storage layer to the greatest extent, and reducing scouring of drilling fluid on well wall, so that drill blocking risks are lowered, and therefore, contradiction between the drilling safety and the storage layer protection in a drilling process of the existing coal bed gas multi-branch horizontal well is relieved to a certain extent.

The invention discloses a viscosity-increasing and shear-increasing agent for oil-based drilling fluid, a preparation method and application thereof. The thickening and cutting agent is formed by the reaction of poly fatty acid and amino-terminated polyether under the conditions of heating and nitrogen protection atmosphere, and the molar ratio of poly fatty acid and amino-terminated polyether is 1:03 to amine group 0.5 feed, the reaction temperature is controlled at 160-200 ° C, heated until no water is formed, and then continue to heat for 30 minutes to complete the reaction to obtain the viscosity-increasing and shearing agent. The viscosity-increasing and shear-increasing agent of the present application has good suspension performance in oil-based drilling fluid, and the dynamic-plastic ratio and shear force of the system are obviously improved.

The invention provides a method for preparing a fluid loss agent. The method comprises the following steps of: a) mixing phenol, sulphuric acid, trimethylamine and a first solvent, and reacting to generate cation phenol; b) mixing an alkaline aqueous solution, lignite and a second solvent, and reacting to obtain sodium humate slurry; and c) mixing the sodium humate slurry with cation phenol, sodium sulfite and a third solvent, and carrying out polymerization to obtain the fluid loss agent. The fluid loss agent provided by the invention is obtained by firstly carrying out cationization on phenol, mixing with the sodium humate slurry and carrying out polymerization, both a humic acid group and a sulfonated phenol group are contained in the molecule of the fluid loss agent, a molecular chainis longer, and a sulfonic acid group has strong inhibition and tolerance effects to various metal ions in soil, thus mud viscosity can not be improved, a mud cake formed by a drilling fluid and soil is compact and is difficult to collapse. Besides, a benzene ring exists, thus the fluid loss agent prepared by the preparation method provided by the invention also has the characteristics of high-temperature resistance and high-pressure resistance.

The invention relates to a high-temperature-resistant water-based drilling fluid cutting agent and a preparation method thereof in the field of petroleum drilling working fluids. The high-temperature-resistant water-based drilling fluid shear lifting agent comprises the following components copolymerized by weight percentage: (1) 40% to 80% of monomer A; (2) 10% to 20% of monomer B; (3) 5% to 20% of monomer C; (4) 5% to 20% of monomer D; said monomer A is selected from acrylamide, N,N-dimethylacrylamide, isobutyl At least one of methacrylamide and acrylonitrile; the monomer B is selected from N-vinylpyrrolidone; the monomer C is selected from methacryloyloxyethyltrimethylammonium chloride, dimethyl diene At least one of propyl ammonium chloride; the monomer D is selected from the amphiphilic macromonomer C18PEGMA; the high temperature resistant water-based drilling fluid cutting agent of the present invention has good cutting performance and temperature resistance, The temperature resistance can reach 150°C, and it can be used as a shear-lifting agent for oil drilling working fluid, improving the suspension stability of the working fluid to the lightening agent or weighting agent, and enhancing the system's rock-carrying ability and wellbore purification ability.

The present invention relates to a CO based 2 / N 2 The preparation method and the application of the paraffin particles of the switch emulsion relate to the technical field of paraffin particles; the preparation method specifically includes the following steps: S1) preparing the oil phase; S2) preparing the water phase; S3) preparing the O / W emulsion: After the oil phase and the water phase are mixed, they are stirred and emulsified to obtain an O / W emulsion; S4) preparation of paraffin particles: carbon dioxide is passed into the O / W emulsion, and the paraffin particles are precipitated, and after centrifugation, paraffin particles and a protonated solvent are obtained; S5) Circulation Utilization: feed nitrogen gas into the protonated solvent to obtain N, N dimethylcyclohexylamine and emulsifier aqueous solution, which are recovered and reused respectively; the invention also discloses the application of paraffin wax particles. The invention discloses a method for preparing paraffin wax particles with recyclable solvent and emulsifier aqueous solution, which saves raw materials, reduces costs and reduces environmental pollution; meanwhile, it also discloses the application of the product in drilling fluid.

The invention relates to a preparation method of high-temperature-resistant and highly-dispersible bentonite. It prepares a solution by selecting a certain proportion of hydroxyethyl cellulose and acrylamide, and performs a synthetic reaction with the prepared solution with ammonium sulfate and sodium bisulfite. Dry the washed precipitate to constant weight under vacuum, purify with acetone, and finally dry the precipitate to constant weight to obtain hydroxyethyl cellulose-acrylamide polymer; disperse sodium bentonite in deionized water to obtain A dispersion liquid, and the prepared hydroxyethyl cellulose-acrylamide polymer is added to the dispersion liquid, and the hydroxyethyl cellulose-acrylamide / bentonite composite is prepared under the action of stirring and grinding. Compared with natural bentonite, the hydroxyethyl cellulose-acrylamide / bentonite composite of the present invention can still maintain a higher dynamic-to-plastic ratio at high temperatures, has a good ability to carry drill cuttings, and can be used in a shorter period of time The performance reaches a stable state with better dispersion.

The invention relates to a cutting agent for gas stagnation plugs in the technical field of petroleum drilling chemical materials and a preparation method. The cutting agent for air stagnation plugs is made by grafting polymerized monomers onto the surface of layered chain clay minerals after organic modification; the cutting agent for air stagnation plugs prepared by the method of the present invention has better high temperature resistance Salt resistance, cutting and water loss reducing performance; the temperature resistance of the air stagnation plug cutting agent of the present invention is better than that of organic cutting agents, and the compatibility and water loss performance are better than simple layered chain clay minerals. The excellent properties of polymers for water loss reduction and layered chain clay minerals’ resistance to temperature and shearing are suitable for use in deep high-temperature formations, and can effectively improve the gas retardation capacity of gas stagnation plugs, thereby slowing down the speed of oil and gas upward channeling and prolonging safe operation time.

The invention relates to a preparation method of high-temperature-resistant high-dispersity bentonite, which comprises the following steps: selecting hydroxyethyl cellulose and acrylamide in a certainratio to prepare a solution, carrying out synthetic reaction on the prepared solution, ammonium sulfate and sodium hydrogen sulfite, drying a washed precipitate in a vacuum state to constant weight,and purifying with acetone, and finally, drying a precipitate to constant weight to obtain a hydroxyethyl cellulose-acrylamide polymer. dispersing sodium bentonite into deionized water to obtain a dispersion liquid, adding the prepared hydroxyethyl cellulose-acrylamide polymer into the dispersion liquid, and stirring and grinding to obtain the hydroxyethyl cellulose-acrylamide / bentonite complex. Compared with natural bentonite, the hydroxyethyl cellulose-acrylamide / bentonite complex disclosed by the invention can still keep a relatively high dynamic-plastic ratio at a high temperature, has a good capability of carrying drilling cuttings, can achieve a stable state in performance within a shorter time, and has better dispersity.

The invention relates to application of a starch nanocrystal as a flow pattern conditioning agent for a drilling fluid, and the drilling fluid, belonging to the field of petrochemical engineering. According to the invention, as the starch nanocrystal is added into the drilling fluid as a flow pattern conditioning agent, the rheological properties of the drilling fluid are effectively improved, andthe drilling fluid presents low plastic viscosity, high dynamic shear force (i.e., a high dynamic shear force ratio), good shear thinning ability and good filtrate loss reducing effect; and the starch nanocrystal is regenerable, widely available and environment-friendly, and shows excellent rheological property adjusting effect under the condition of low addition amount.

The invention discloses full oil base drilling fluid with high dynamic shear force ratio. The full oil base drilling fluid comprises base oil and other ingredients on the basis of the volume of the base oil: 1.5-2.5% of main emulsifying agent, 0.5-1.0% of auxiliary emulsifying agent, 0.8-1.0% of reverse wetting agent, 0.8-1.0% of shearing potentiator, 0.3-0.5% of thermoplastic flow type regulating agent, 2.0-3.0% of calcium oxide, 1.0-3.0% of organic soil, 1.5-2.0% of fluid loss additive and weighting material, and due to the addition amount of the weighting material, the density of the full oil base drilling fluid is 0.89-2.50g / cm<3>. The addition amount of the organic soil in the full oil base drilling fluid system is reduced by 1.0-3.0% through adding the thermoplastic fluid type regulating agent, the dynamic shear force ratio of the system is obviously improved and can achieve more than 0.45, the rheological property of the system can be improved, the comprehensive properties can be improved, and the production cost can be saved.

The invention relates to the field of drilling fluids, and discloses a preparation method of a water-based tackifying and shear strength improving agent for drilling fluids. The method comprises the following steps: 1, dissolving an anionic monomer, a nonionic monomer and a cationic monomer in water under stirring, and mixing; 2, adjusting the pH value of a mixed solution obtained in step 1 to 5-10, and continuously stirring; and 3, adding an oxidizing agent, a reducing agent and an azo initiator into a mixture obtained in step 2, and reacting under stirring. The water-based tackifying and shear strength improving agent for drilling fluids has the advantages of excellent tackifying and shear strength improving performances, excellent temperature resistance and excellent system applicability, and the excellent tackifying and shear strength improving performances of the agent allow a drilling fluid system to have a high dynamic plastic ratio, the drilling fluid flow pattern to be well optimized, the dynamic shear force of the system to be improved and the cuttings carrying ability of the system to be enhanced.

The invention relates to a novel high-temperature-resistant low-viscosity high-shear water-in-oil drilling fluid which comprises the following components in parts by weight: 68-72 parts by weight of fluid oil, 10-11 parts by weight of a brine phase, 5.8-6.4 parts by weight of a primary emulsifier, 1.9-3.2 parts by weight of an auxiliary emulsifier, 3.0-3.7 parts by weight of organic bentonite, 2.8-2.9 parts by weight of lime and 3.9-5.6 parts by weight of a filtrate reducer. The novel high-temperature-resistant low-viscosity high-shear water-in-oil drilling fluid can be resistant to the temperature of 200 DEG C and has the characteristics of low viscosity, high shear force, high suspending power and good filtration well building property.

The present invention relates to a kind of cutting agent for water-based drilling fluid and a preparation method thereof in the field of oil drilling working fluid; the cutting agent for water-based drilling fluid comprises the following components in weight percentage: 25% to 40% of Monomer A; 10% to 25% of monomer B; 25% to 40% of monomer C; 10% to 25% of monomer D; wherein, monomer A is selected from 2-acrylamide-2-methyl Propanesulfonic acid, at least one of 2-acryloyloxy-2-methylpropanesulfonic acid, acryloyloxybutanesulfonic acid, 2-acrylamide-2-phenylethanesulfonic acid; monomer B is N- Vinylpyrrolidone; Monomer C is selected from methacryloxyethyltrimethylammonium chloride or dimethyldiallylammonium chloride; Monomer D is reactive 4‑vinyl‑1‑(3‑ Sulfopropyl) pyridinium salt; the water-based drilling fluid of the present invention has good cutting performance and temperature resistance, and the temperature resistance can reach 150 ° C, and can be used as a cutting agent for oil drilling fluids. Improve the suspension stability of the working fluid to the lightening agent or weighting agent, and enhance the system's rock-carrying ability and wellbore purification ability.