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 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 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 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.