Abstract:
Method for dewatering, pressure testing, hydrotreating, suppressing methane hydrate formation and suppressing solution freezing point in pipeline operations have been disclosed, where the solution used in the operations includes an effective amount of a metal formate salt. The metal formate salt solutions have a low viscosity, have a high density, have a low metals corrosivity, are non-volatile, have a low solubility in hydrocarbons, are readily biodegradable, have a low toxicity, are non-hazardous, have a low environmental impact, have a freezing point depression property forming water/formate eutectic point mixtures, and have a water-structuring and water activity modification property.
Abstract:
Method for dewatering, pressure testing, hydrotreating, suppressing methane hydrate formation and suppressing solution freezing point in pipeline operations have been disclosed, where the solution used in the operations includes an effective amount of a metal formate salt. The metal formate salt solutions have a low viscosity, have a high density, have a low metals corrosivity, are non-volatile, have a low solubility in hydrocarbons, are readily biodegradable, have a low toxicity, are non-hazardous, have a low environmental impact, have a freezing point depression property forming water/formate eutectic point mixtures, and have a water-structuring and water activity modification property.
Abstract:
Disclosed herein is an apparatus for continuously producing and pelletizing gas hydrates. The apparatus includes a gas supply unit, a water supply unit and a reactor. Gas and water are respectively supplied from the gas supply unit and the water supply unit into the reactor. The gas and water react with each other in the reactor. The reactor includes a dual cylinder unit which forms a gas hydrate in such a way as to squeeze a slurry of reaction water formed by the reaction between the gas and water. The dual cylinder unit includes an upper cylinder, a lower cylinder and a connection pipe which connects the upper cylinder to the lower cylinder. The connection pipe has passing holes through which the reaction water in the reactor flows into and out of the connection pipe.
Abstract:
A gas pressure reducer comprising at least one gas expansion device for allowing the gas to expand and thereby reduce in pressure, and at least one means for raising the temperature of the gas in the vicinity of the gas expansion device and wherein the means for raising the temperature of the gas comprises a liquid or solid fuel heater or a liquid fuelled engine.
Abstract:
Valve, especially for dosing inhibitors to prevent forming of hydrates in the exploration of oil and gas, or as a liquid choke. The inhibitor or liquid has a first and higher pressure upstream of the valve and a second and lower pressure downstream of the valve. The valve has a valve body with at least one orifice therethrough. The orifice has a substantially uniform diameter and an upstream inlet part. The inlet part has an enlarged diameter relative to the substantially uniform diameter of the orifice. The valve body is disc shaped with a plurality of parallel orifices placed equidistant from a rotational axis.
Abstract:
Controlling the formation of crystalline hydrates in various fluid systems, most notably, gas and oil transmission pipeline systems by contacting the systems with certain polymers or polymers associated with solid particles. The polymers useful are chelating polymers capable of interacting with charged gaseous molecules such as carbon dioxide, by removing the carbon dioxide, or more practically by scavenging for the carbon dioxide, to prevent the methane or ethane hydrate structures from forming since they require carbon dioxide to stabilize their structures.
Abstract:
A method for inhibiting the formation of gas hydrates within a fluid comprising a gaseous hydrocarbon phase, a liquid hydrocarbon phase and an aqueous phase which method comprises mixing a polymeric emulsifier and optionally a non-ionic non-polymeric co-emulsifier with the fluid prior to subjecting the fluid to conditions under which gas hydrates can be formed so as to generate a water-in-oil emulsion comprising a discontinuous aqueous phase, a continuous liquid hydrocarbon phase and a substantially gas impermeable interfacial layer comprising said polymeric emulsifier and optionally said non-ionic non-polymeric co-emulsifier wherein the aqueous phase is distributed in the continuous liquid hydrocarbon phase in the form of droplets and the substantially gas impermeable interfacial layer encapsulates said droplets.
Abstract:
The present invention provides improved methods of drying pipelines containing water which are to transport hydrate forming gaseous fluids. The methods basically comprise flowing a liquid which forms an azeotrope mixture with water into contact with water in a pipeline, the amount of the azeotropic liquid being sufficient to form an azeotrope mixture with the water whereby as the mixture is evaporated in the pipeline, the water concentration in the remaining mixture does not reach that concentration which will form hydrates with the hydrate forming gaseous fluid.
Abstract:
A process for transporting a fluid in a pipe under conditions where hydrates may form. In the process, the pipe fluid contains at least one of a gaseous hydrocarbon or liquid hydrocarbon and water and the water content is less than the liquid hydrocarbon content. The process includes the steps of 1) adding a dispersive additive in a hydrocarbon solution to the fluid to be transported, so as to form an emulsion, 2) transporting the liquid and gaseous hydrocarbons in the presence of water and the hydrates, 3) separating the gas phase, the hydrocarbon liquid in excess and a liquid hydrocarbon phase comprising the hydrates and the dispersing additive, and 4) separating the liquid hydrocarbon phase comprising the hydrates and the dispersing additives. The liquid hydrocarbon phase comprising the hydrates is separated by dissociating the hydrates to form a water-in-oil emulsion, the additives being solved in the oil or liquid hydrocarbon, and breaking the water-in-oil emulsion so as to obtain an aqueous phase and a liquid hydrocarbon comprising the additives. Finally the liquid hydrocarbon phase containing at least part of the dispersing additive from step 4, is recycled to a point in the pipe.
Abstract:
A natural gas compression heating process for regulating the operating temperature of the natural gas flowing through long pipelines in continuous permafrost and discontinuous permafrost regions. The heat obtained through compression of the natural gas, instead of actually heating as performed conventionally, is utilized to raise the temperature of the natural gas to only the desired operating temperature. Consequently, the locations of the natural gas compression heating process and compression stations along the pipeline in a permafrost region are determined by the flowing temperature profile of the pipeline instead of the conventional standard compression cost versus pipeline diameter analysis.