SU1417909A1 - Method of preventing deposition of gas hydrates - Google Patents

Abstract

The invention relates to the gas industry and can be used in the transportation of gas-liquid mixture from a well to an integrated gas processing facility. The method of transportation through the pipeline from the well of the liquid-gas mixture, is carried out by introducing an additive to prevent gas-hydrate deposits of the emulsifier, stabilizing the emulsion water in the condensate and separating the hydrocarbon condensate and water from the gas, the additive is dissolved in the separated hydrocarbon condensate and then dispersed in the temperature zone above the equilibrium temperature of hydrate formation together with the gas-liquid mixture achieved, and at the separation stage the emu formed along the route The lion-gas hydrate mixture is heated to a temperature above the equilibrium hydrate formation temperature and allowed to stand until hydrate decomposition, and an emulsifier is used as an additive, which stabilizes the water-like emulsion in the condensate. 1 hp f-ly, 1 tab. (Oh (L

Description

41

(UD

The invention relates to the gas industry and can be used, for example, in transporting gas from a well from a well to an integrated gas processing unit (GTU),

; The purpose of the invention is to reduce toxicity and reduce the cost of the process.

PRI me R 1. To determine the possibility of emulsion formation, water in hydrocarbon condensate, the sludge time of which exceeds the time of gas-liquid mixture movement through the pipe: from the well to the separation point (no more than 15 minutes), were selected: emulsifiers representing by itself | refined products, because | they are cheap and not scarce. These emulsifiers are introduced into the hydrocarbon condensate in an amount of 0.01-0.3 wt.%; And mixed in a mechanical mixer until complete dissolution. In this way, a solution with a given concentration of emulsifier is obtained injected with a dosed amount of water and stirred in a mechanical mixer until the water is completely converted into an emulsion. Then the emulsion is poured into a settling measuring vessel and visually imbibed for its separation. Record the moment of occurrence of free water at the bottom of the settling vessel. The time from the beginning of observation to the appearance of free water is recorded in the table, where the results of some experiments, such as the time of sludge emulsion, are given.

On the basis of the experiments performed, it was concluded that the selected emulsifiers provide the fundamental possibility of obtaining emulsion water in condensate, the sludge time of which exceeds by several times the time of gas-liquid mixture from the well to the separation point. At this, the concentration of the emulsifier in the hydrocarbon condensate is sufficient to be maintained in the range of 0.05–0.10 wt.%, Since at lower concentrations the emulsion is not stable enough, and in higher concentrations there is no technological

of necessity.

g

PRI mme R 2. Gas-liquid flow, containing: iy gas in the amount of 40 thousand, hydrocarbon condensate in the amount of 10 kg / h and water in the amount of 130 kg / h is extracted from the well with kg / cm and and

0 5 0 5

0

five

0

transported by pipeline to the point of separation, where separated. gas from liquid, and also water is separated from hydrocarbon condensate. When moving along the pipeline route, the gas-liquid flow is cooled by external heat exchange to. C, while gas hydrates are formed in it (starting with T 12 C). To prevent deposits of gas hydrates on the walls of the pipeline and equipment, at the separation point, 500 kg / h of hydrocarbon condensate are taken, 500 g / h of the ES-2 emulsifier is introduced into it and the pipeline is directed to the well, where it is introduced into the gas-liquid stream. The gas-liquid stream, after introducing hydrocarbon condensate with an emulsifier into it, is directed into a venturi tube with a critical cross-section diameter of 50 mm, where it acquires a linear velocity of 55-60 m / s, as a result of which all liquid (water and hydrocarbon condensate with emulsifier) is dispersed to the average geometric droplet size d.30 microns. In the process of crushing water and hydrocarbon condensate with an emulsifier dissolved in it, an emulsion of water is formed in the condensate. To prevent water that is not lokolizovannaya in globules emulsion B9Da in the condensate, the gas-liquid flow after the Venturi pipe is sent to a separator-sump, in which water droplets that are not localized in emulsion globules water is deposited on the bottom and merge into the pipeline. in a solid mass. By sampling from the bottom of the separator-sump, the presence of a solid mass of water after the Venturi tube is monitored. If a solid mass of water is found at the bottom of the separator-settler, then it is sent for redispersion into the Venturi tube.

From the settling separator, the gas and the emulsion water in the condensate are directed into the pipeline, through which their total flow is transported to the separation point.

Along the pipeline route, the gas-liquid stream is cooled due to heat exchange with the environment to a temperature below the equilibrium hydrate formation temperature and gas hydrates are formed in the condensate globules. At the separation point, the gas-liquid stream is sent to a separator, in which the gas is separated from the liquid, which is an emulsion-hydrate-hydrate mixture.

Claims (2)

1. Method of preventing gas hydrate deposits during transport natural gas by introducing an organic reagent, characterized in that, in order to reduce toxicity and reduce the cost of the process, an emulsifier solution in a hydrocarbon condensate is used as an organic reagent, and the reagent is introduced at a gas temperature above the equilibrium temperature of hydrate formation, dispersing the reagent in the gas stream until the water is completely transferred to the emulsion. 2. The method according to claim 1, which is different in that the emulsifier is introduced in an amount of 0.05-0.10% by weight of the hydrocarbon condensate. Compiled by L. Bykhover Editor L. Zaitseva Tehred M. Khodanich Proofreader G. Reshetnik Order 4093/6 Circulation 642 VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Subscription