Method for predicting generation of hydrate in nature gas pipeline

Abstract

The invention discloses a method for predicting generation of hydrate in a nature gas pipeline, and belongs to the technical field of oil-gas storage and transportation engineering. With the continuous development of Chinese economy, the consumption demand of people for natural gas is continuously increased. The technique for transporting the natural gas needs to be continuously promoted in the industrial field, but natural gas hydrate formed in the process of transporting the natural gas through pipelines is important obstruction for restricting the development of the natural gas transportation technique. The method disclosed by the invention solves the problem that selecting a pipeline position is blind when the natural gas hydrate is disposed in the past engineering. The starting point of the hydrate generated in the pipeline is found out by analyzing the pressure and the temperature of a discretionary point of the pipeline, synthetizing a pressure-temperature curve of the pipeline and contrasting the pressure-temperature curve of the pipeline and a phase equilibrium curve of the hydrate. Through adoption of the method disclosed by the invention, the place in which the hydrate is generated in the natural gas transportation pipeline can be disposed in a targeted manner, so that the use quantity of natural gas hydrate inhibitors is reduced.

Description

technical field [0001] The invention belongs to the technical field of oil and gas storage and transportation engineering, and in particular relates to a method for predicting the generation position of natural gas hydrate in a gas transmission pipeline by using computer software. Background technique [0002] During oil and natural gas extraction, transportation and processing, under relatively high pressure and low temperature conditions, certain components in natural gas and liquid water form ice-snow complexes, which are called natural gas hydrates. Since Davy first discovered gas hydrate in 1810, people have done a lot of research on the phase equilibrium conditions and formation mechanism of gas hydrate. At present, there are mainly three methods to form the phase equilibrium curve of natural gas hydrate: the first is to use the experimental method to obtain the required model according to the conditions when the hydrate is formed; the second is to use the actual field...

AI Technical Summary

Problems solved by technology

The formation of hydrates in natural gas pipelines is related to natural conditions such as landform and climate, as well as the conditions of the pipeline itself. They are suspended in the gas flow and gradually gather together, adsorbed on the pipe wall, and eventually lead to pipeline blockage and gas transmission difficulties. In severe cases It will cause the failure of separation equipment and instruments, which will affect the entire production process and cause immeasurable economic losses

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