123 results about "Kinetic Inhibitor" patented technology

A method for treating a fluid having hydrate-forming constituents is provided. In one or more embodiments, the method includes including a mixture (110) comprising glycol and one or more kinetic inhibitors to a fluid (105) that includes one or more hydrate-forming constituents and water to provide a treated fluid comprising the glycol, one or more kinetic inhibitors, one or more hydrate-forming constituents and water. The treated fluid (125) is then separated at conditions sufficient to provide an oil phase stream and an aqueous phase stream, wherein the aqueous phase stream includes one or more kinetic inhibitors, glycol and water.

The invention discloses a compound low dosage natural gas hydrate inhibitor. The hydrate inhibitor benchmarked against the mass of water in a deepwater drilling fluid completion fluid comprises, by mass, 0.1-2% of a hydrate kinetic inhibitor, 0.1-2% of a kinetic inhibitor synergist and 0-10% of a hydrate thermodynamic inhibitor. The hydrate kinetic inhibitor is at least one of polyvinyl pyrrolidone, polyvinyl caprolactam, and a copolymer generated through a reaction of vinyl pyrrolidone, vinyl caprolactam, alkenyl sulfonic acid and isopropylmethacrylamide. The kinetic inhibitor synergist is at least one of benzyltributylammonium chloride, tetraheptylammonium bromide, ethylene glycol phenyl ether, propylene glycol phenyl ether, polyoxyethylene and polyoxypropylene. The hydrate inhibitor can effectively inhibit generation of hydrates under a low dosage (0.2-10%), is suitable for deepwater and ultra-deep water drilling and completion, greatly reduces the cost and the logistical support burden, and has small harms to environment.

The invention discloses a novel hydrate kinetic inhibitor and a preparation method and applications thereof. The preparation method comprises the following steps: dissolving a monomer into a solvent, adding an initiator to trigger the polymerization of a solution, to obtain a novel hydrate kinetic inhibitor, wherein the main component of the inhibitor is polyhydroxyl polymer; the monomer is prepared by reacting chlorophenol with N-vinyl caprolactam or N-vinnyl pyrrolidone. The inhibitor has an effect that other inhibitors are combined with alcohols for use, can bear low supercooled temperature, the formation and induction time of a hydrate can be prolonged, the inhibitor of the hydrate inhibitor can be improved, and the novel hydrate kinetic inhibitor is high in efficiency, low in dose, wide in applicability and the like.

The invention discloses a novel kinetic inhibitor, with a structural formula shown as formula I (wherein n ranges from 100 to 40000, R is *(CH2) m*, and m ranges from 1 to 5) in the description, of ahydrate. The novel kinetic inhibitor is good in water solubility and high in inhibition activity, can have a good inhibition effect and has the advantages of low dosage, high efficiency, high applicability and the like, the use quantity is small, and the cost is reduced; the novel kinetic inhibitor can effectively delay nucleation of the hydrate and reduce hydrate formation rate when used in an environment at a high supercooling degree under low dose concentration (0.1wt%-10wt%), is applicable to oil-gas-water three-phase, oil-water two-phase or gas-water two-phase coexistence system, appliesto inhibition for hydrate generation in oil-gas exploitation, processing and conveying processes, is not limited by supercooling degrees and application situations and has broad application prospect.

The invention relates to polymers derived at least from one: (A) one N-vinyl amide unit, and (B) one hydroxyl-containing acrylate unit, and to polymers derived at least from: (A) N-vinyl-2-caprolactam, and (B) one non-acrylate unit having: (i) at least one hydroxyl group, and/or (ii) at least one functional group convertible to a hydroxyl group wherein at least one group is converted to hydroxyl functionality in the final polymer product. Such polymers may exhibit degradability, e.g., in seawater or soil environments. In preferred embodiments, these polymers and compositions thereof are used in oilfield applications, such as an inhibitor of gas hydrates and/or a kinetic inhibitor of gas hydrates. The polymer can assume alternating, block, and/or random configurations of the repeating units, with at least one ester group. The chemical structure subscripts m, and n may be any integer equal to or greater than 1.

The invention belongs to the field of gas storage and transportation, and specifically relates to a compound type gas hydrate inhibitor. The inhibitor consists of the following components in percentage by mass: 0.1-0.5% of polyvinyl caprolactam, 1-5% of alcohol or salt and the balance of water. According to the inhibitor provided by the invention, by adding a certain amount of salt or alcohol into the existing dynamic inhibitor, the generation time of a hydrate can be increased, and the generation amount of the hydrate can be reduced; and moreover, the inhibition effect of the dynamic inhibitor is greatly improved so that the dynamic inhibitor has a better effect and is more stable and wider in range of application.

The invention discloses a combined hydrate inhibitor, prepared by mixing a dynamics inhibitor, ionic liquid and water, wherein in percentage by mass, the mass concentration of the dynamics inhibitor is between 0.05% and 5% and the mass concentration of the ionic liquid is between 0.05% and 5%. The combined hydrate inhibitor is applicable to an oil-gas-water three-phase coexisting system or an oil-water or gas-water two-phase coexisting system, is used for inhibiting the generation of hydrates in exploitation, processing and transportation of oil and gas, and can achieve good inhibiting effect with a small use amount, thus reducing the cost; in addition, the combined hydrate inhibitor is friendly to the environment and has a wide prospect.

The invention discloses a compound gas hydrate polymerization inhibitor and application thereof. The compound gas hydrate polymerization inhibitor consists of a betaine zwitterionic surfactant and a polyalcohol nonionic surfactant in the mass ratio of (0.01-100):1. The compound gas hydrate polymerization inhibitor is applied to prevention of gas hydrate polymerization in an oil-gas-water three-phase mixed conveying system. The compound gas hydrate polymerization inhibitor has the advantages that (1) used raw materials are low in toxicity, and have high biodegradability in nature, so that severe environmental pollution is avoided; (2) the defects of the conventional gas hydrate inhibitors such as large using amount, high cost and high pipeline quality requirement in a thermodynamic inhibitor, low super-cooling degree bearing capacity of a kinetic inhibitor, and the like are overcome; the particle size of the gas hydrate can be effectively controlled, and gas hydrate particles are uniformly distributed into an oil phase, so that the problem concerned with safe flow of oil-gas-water phases is solved effectively; (4) the adding amount is small, the polymerization resistance is high, and the application prospect is good.

The invention discloses a composite hydrate inhibitor. The composite hydrate inhibitor is formed by configuring a kinetic inhibitor and ionic liquid according to the mass ratio of 1:1, wherein the kinetic inhibitor is polyvinylcaprolactam with the weight-average molecular weight of 900-40000. The hydrate inhibitor disclosed by the invention has high inhibition activity, small using amount, low cost and environmental friendliness, is easy to recover and applicable to an oil-gas-water three-phase or oil-water or gas-water two-phase coexistence system, is applied to generation of inhibition hydrates in oil-gas production, processing and conveying processes and has broad prospects.

The invention discloses a hydrate inhibitor composite which comprises the following components in parts by weight: 1-5 parts of polyvinyl alcohol caprolactam and 1-8 parts of mixed preparations, wherein the mixed preparations are selected from one or more of alcohols, ethers or polymers. The hydrate inhibitor composite disclosed by the invention enhances the inhibition property of an inhibitor by taking the dynamic inhibitor as a main agent and adding certain mixed preparations.

The invention discloses a preparation method of an amide copolymer hydrate kinetic inhibitor, and belongs to the technical field of preparation of chemical engineering reagents. The preparation method is concretely characterized in that the AM/AN/VCL ternary copolymer hydrate kinetic inhibitor with the molecular weight reaching 300,000-500,000 is synthesized from acrylamide (AM), acrylonitrile (AN) and vinyl caprolactam (VCL) in anoxic environment with azodiisobutyronitrile as an initiator and nonionic surfactant-containing deionized water as a disperse medium. The method has the characteristics of simple production process and low production cost, and the prepared inhibitor has the advantages of low injection dosage and long inhibition time.

The invention provides a high-efficiency and environmentally-friendly hydrate inhibitor, and relates to the technical field of oil-gas hydrates. The hydrate inhibitor is a mixture of a dynamic inhibitor, nitrate and acetate. The suitable pressure of the hydrate inhibitor is 1 to 25MPa and the suitable temperature is between -25 and 25 DEG C. The inhibitor can overcome the defects of the prior art; the inhibitor at low concentration is mixed and injected into petroleum and natural gas fluid for production and transportation, so that the speed of nucleation and growth of the hydrate is reduced, the inhibiting effect and the application range of the hydrate inhibitor are greatly increased, and the hydrate inhibitor has the characteristics of wide applicability, economy, high efficiency and environmental protection.

The invention relates to an environment-friendly high-performance kinetic hydrate inhibitor and a synthetic method thereof and belongs to the field of hydrate inhibitors. The environment-friendly high-performance kinetic hydrate inhibitor is a branched polymer formed by reaction of vinyl pyrrolidone, polyalkylene glycol allyl glycidyl ether, polyether amine and preferred solvents. Compared with the prior art, the novel environment-friendly high-performance kinetic hydrate inhibitor not only has the advantages of high efficiency, low dosage and environment friendliness of existing kinetic inhibitors but also has the advantages of low cost, little susceptibility to the environment, universal applicability and persistence lacking in the existing kinetic inhibitors.

The invention relates to a composite inhibitor of natural gas hydrate. The composite inhibitor is prepared from 0.5 to 2 parts of a kinetic inhibitor, 0 to 15 parts of a thermodynamic inhibitor, 0.5 to 1.5 parts of an anti-agglomeration agent and 81.5 to 99 parts of a matrix. The inhibitor provided by the invention is used in a compounding manner, small in adding amount and good in economical efficiency; temperature and pressure of generating the hydrate can be effectively reduced; in a utilization process, the composite inhibitor is convenient to prepare on site, a pumping speed is repid and precious working time is saved; the inhibitor has relatively low surface tension and rapid backflow of residual liquid after working is finished is convenient to realize; the inhibitor can be matched with an anti-swelling agent and the aim of stabilizing a stratum is realized; the inhibitor can also be matched with quick water, so that the inhibitor has dual effect and does not need to work independently, and a lot of human and material resources can be saved.

The invention provides an amide copolymer hydrate kinetic inhibitor and application thereof. The amide copolymer hydrate kinetic inhibitor is as shown by a formula I as shown in the specification, andhas a weight-average molecular weight of 10,000 to 90,000 and a molecular weight distribution coefficient of 1 to 3. Compared with an existing kinetic inhibitor, the amide copolymer hydrate kinetic inhibitor synthesized in the invention is simple in synthesis process and high in yield, simultaneously contains two effective inhibitor ingredients, but only has one ring-shaped structure, is controllable in molecular weight and relatively small in molecular dispersion coefficient, and has a wider use range and conditions.

The invention provides a novel hydrate dynamics inhibitor. The novel hydrate dynamics inhibitor comprises a hydrate-proof nucleating agent, a hydrate-proof growth agent and an additive. The novel hydrate dynamics inhibitor has the characteristics that the defects of large usage amount, high economic cost, pollution to environments and the like of the traditional thermodynamics inhibitor are well overcome; compared with the conventional hydrate-proof inhibitor and the hydrate polymerization inhibitor, the nucleating and growth rates of the hydrate can be effectively inhibited, and the formation time of the hydrate is prolonged; the large supercooling degree can be borne, the economic effect is realized, the efficiency is high, and the like; the problem of blockage of hydrate in the oil-gas-water three-phase and gas-water two-phase mixed conveying pipelines is effectively solved.

The invention provides a composite hydrate kinetic inhibitor based on a vinyl imidazole copolymer and an application thereof. The composite hydrate kinetic inhibitor is prepared from a vinyl imidazolecopolymer and an assisting agent, wherein the assisting agent is N-butyl-N-methylpyrrolidinium tetrafluoroborate and diethylene glycol monobutyl ether, the structure of the vinyl imidazole copolymeris as shown in a formula I (described in the specification), wherein n is equal to 10-600, m is equal to 2-900, and the molecular weight distribution coefficient of the vinyl imidazole copolymer is between 1.2 and 1.8. By introducing 1-Vinylimidazole in the process of copolymer synthesizing, through the strong hydrophilicity and biodegradability of imidazole five-membered ring, compared with a single homopolymer PVCap, the water solubility and environmental friendliness of the copolymer inhibitor are improved.

The invention relates to novel polymers derived from: (A) at least one N-vinyl amide-based unit and/or at least one acrylamide-based unit, and (B) at least one unit comprising: (i) at least one hydroxyl group, and/or (ii) at least one functional group convertible to a hydroxyl group wherein at least one group is converted to hydroxyl functionality in the final polymer product, wherein the polymer comprises at least one ester group. The polymers and compositions are used in oilfield applications, such as an inhibitor of gas hydrates and/or a kinetic inhibitor of gas hydrates. The polymer can assume alternating, block, and/or random configurations of the repeating units, with at least one ester group.

The invention discloses a dynamics inhibitor, a preparing method of the dynamics inhibitor and a compound inhibitor. The dynamics inhibitor is obtained through monomer copolymerization; a monomer comprises vinyl pyrrolidone, vinyl-epsilon-caprolactam and allyl polyethenoxy ether-1000; the compound inhibitor is made by mixing 0.6wt% of the above dynamics inhibitor and 5wt%-9wt% of a thermodynamics inhibitor according to the size ratio being 1:1; and the thermodynamics inhibitor is selected from ethyl alcohol, ethylene glycol and glycerol. The dynamics inhibitor is low in using dosage, low in inhibition temperature, efficient and reliable, and the maximum inhibition temperature can reach -8 DEG C; and according to the compound inhibitor, the maximum inhibition temperature can reach -11 DEG C.

The invention discloses a zwitterion-contained copolymer compounded natural gas hydrate inhibitor. According to the compounded natural gas hydrate inhibitor, the monomers including vinyl-epsilon-caprolactam, vinyl pyrrolidone and methylacrylic acid sulfo-acid betaine are initiated to be copolymerized into a random copolymer by adopting a free radical polymerization method, and then the random copolymer and a thermodynamic inhibitor are compounded to inhibit nucleating and growth of a natural gas hydrate. The zwitterion-contained copolymer serves as a kinetic inhibitor and simultaneously showsthe performance of the thermodynamic inhibitor. The zwitterion-contained copolymer is used after being compounded with the alcohol thermodynamic inhibitor, and the using amount of alcohol can be decreased while growth of the hydrate is better inhibited. According to the compounded natural gas hydrate inhibitor, materials are easy to obtain, a method is simple and convenient, conditions are controllable, the prepared compounded natural gas hydrate inhibitor has the good effects that forming and growth of the natural gas hydrate are inhibited.

The invention discloses frozen-soil hydrate deposit polyvinyl alcohol type drilling fluid, and relates to the field of natural gas hydrate exploitation. The drilling fluid is prepared from the following components: polyvinyl alcohol, sodium chloride, methyl alcohol, ethylene glycol, sulfonated phenolic resin SMP-2, potassium humate, xanthan gum, polyvinylpyrrolidone K30, polyoxyethylene and prepared water. The frozen-soil hydrate storage polyvinyl alcohol type drilling fluid can be used for frozen-soil-layer natural gas hydrate deposit drilling, and has the effects of no solid phase and low temperature resistance; a kinetic inhibitor and a synergist are added into the drilling fluid for compounding, so that relatively strong hydrate generation inhibition effect is achieved; and moreover, the drilling fluid is small in environmental harm by components, and has the advantages of being efficient, environmentally friendly, adopting cheap and easily available raw materials, and the like.

The invention discloses a compound drilling fluid for natural gas hydrate (NGH) reservoir in a frozen soil area, and relates to the field of NGH exploitation. The drilling fluid comprises following components: sodium formate, sodium chloride, glycol, low viscosity carboxymethyl cellulose (LV-CMC), potassium polyacrylate, xanthan gum, polyvinyl caprolactam, polyvinyl methyl ether, tetra-n-butyl ammonium phosphate, and make-up water. The drilling fluid is suitable for NGH drill wells in a frozen soil layer, does not contain any solid phase, and is resistant to low temperature. The drilling fluidis compounded with a kinetic inhibitor and a synergist to inhibit the generation of hydrates. Moreover, the components of the drilling fluid are basically harmless to the environment, and the drilling fluid has the advantages that the efficiency is high, the environment is protected, and the raw materials are cheap and easily available.