Device and method for measuring hydrate reservoir decomposition rate during drilling

Abstract

The invention belongs to the field of natural gas development, and in particular relates to a device and a method for measuring hydrate decomposition rate during drilling. The device for measuring the dissociation rate of hydrate reservoirs and the gas volume of hydrate dissociation during the drilling process includes: a hydrate formation and dissociation unit, an auxiliary unit and a measurement unit. The hydrate formation and decomposition unit simulates the environmental conditions of the hydrate reservoir during drilling and provides a place for the formation and decomposition of hydrate; the auxiliary unit provides gas and liquid sources for the formation of hydrate; the measurement unit measures the decomposition of hydrate reservoir rate and decomposition gas volume. The invention can simulate the decomposition of the hydrate layer reservoir and the gas production after the decomposition during the drilling process, and is used for evaluating the safety of deep-water drilling.

Description

technical field [0001] The invention belongs to the field of natural gas development, and in particular relates to a device and a method for measuring the decomposition rate of a hydrate reservoir during drilling. Background technique [0002] As an important marine energy source, natural gas hydrate has the advantages of large reserves, high energy density, shallow burial, and wide distribution. It is an ideal alternative to traditional coal and petroleum energy. The United States, Russia, Canada, Germany, Japan, South Korea and other countries have successively positioned the development of gas hydrates as the commanding heights of the national science and technology strategy, invested a lot of manpower and material resources, carried out a series of key researches, and achieved certain results. my country also conducted research on natural gas hydrate at the end of the last century, and regarded the efficient exploitation of natural gas hydrate as a long-term goal. [00...

AI Technical Summary

Problems solved by technology

The traditional numerical simulation method involves many assumptions, which are quite different from the actual situation, and cannot truly reflect the actual hydrate layer conditions.

In recent years, some scholars have begun to design simulation experimental devices to monitor the hydrate layer in the indoor environment, but they have not simulated the impact of the grinding of the drill bit and the circulation of the mud on the system temperature and the phase transition of the hydrate during the drilling process. However, neither the decomposition of hydrate nor the amount of gas produced after decomposition have been measured and analyzed, and these parameters are important safety parameters to ensure the drilling of hydrate layers.

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