Device and method for exploiting natural gas hydrates by means of thermal fluid fracturing

Abstract

The invention belongs to the technical field of unconventional oil and gas exploitation, and particularly relates to a device and a method for exploiting natural gas hydrates by means of thermal fluid fracturing. The device for exploiting the natural gas hydrates by means of thermal fluid fracturing comprises a fracturing fluid injection system, a natural gas exploitation system and a well system; the fracturing fluid injection system is used for providing high-pressure thermal fracturing fluid and injecting the high-pressure thermal fracturing fluid into the well system; the natural gas exploitation system is used for controlling the pressure difference between a hydrate reservoir stratum and the ground so that the hydrates can be exploited in a depressurization manner; and the well system is used for opening the hydrate reservoir stratum and guiding the fluid to flow into or flow out of the reservoir stratum. The method for exploiting the natural gas hydrates by means of thermal fluid fracturing is implemented by the device. The device and the method have the advantages that a plurality of processes for exploiting hydrates can be combined and used together, the hydrate exploitation efficiency is improved, and the method for exploiting the hydrates is high in prospect.

Description

technical field [0001] The invention belongs to the technical field of unconventional oil and gas exploitation, and in particular relates to a device and method for exploiting natural gas hydrate. Background technique [0002] With the rapid increase in the demand for oil and gas energy in my country's economic development and the implementation of the new oil and gas energy strategy, the field of oil and gas exploration and development continues to expand, gradually shifting from conventional oil and gas resources to unconventional natural gas resources. As a potential energy source, natural gas hydrate has broad prospects and development space. According to statistics, the distribution range of seabed natural gas hydrate accounts for 10% of the total ocean area, which is equivalent to 40 million square kilometers. It is by far the most valuable and promising energy source on the seabed, enough for human use for 100 years. Some scientists predict that the natural gas hydra...

AI Technical Summary

Problems solved by technology

Since natural gas hydrate is filled in the sediment pores in the form of solid cement, its heat and mass transfer efficiency is much lower than that of conventional oil and gas reservoirs, and it is limited by the limited contact area between the wellbore and the reservoir, making the above method to exploit hydrate The decomposition period of the deposit is long, and it is often accompanied by a large amount of heat loss, which limits the mining efficiency

Images