Experiment device for simulating natural gas hydrate formation well cementation

Abstract

The invention discloses an experiment device for simulating natural gas hydrate formation well cementation, and relates to the technical field of unconventional oil-gas reservoir development. The experiment device comprises a kettle body, a gas liquid pressurizing injection system, a cement paste injection system, a temperature control system and a data processing system, wherein the kettle body comprises a kettle tube and a kettle cover; a first space used for being filled with formation skeleton simulation materials and a second space used for being injected with cement paste are formed inside the kettle tube; the second space is positioned between the first space and the kettle cover; the gas liquid pressurizing injection system communicates with the second space through a second pipeline, and is used for injecting the cement paste into the second space; the temperature control system is used for controlling the temperature of the kettle tube and the kettle cover; and the data processing system is used for collecting temperature or pressure data in the first space and the second space, and processing and analyzing the data. The experiment device realizes the in-situ test in aspects of conduction laws of well cementation cement paste hydration heat in the well cementation process in the hydrate containing formation near the well wall, the influence of the well cementation cement paste hydration heat on the formation temperature and hydrate stability, and the like.

Description

technical field [0001] The invention relates to the technical field of unconventional oil and gas reservoir development, and more specifically relates to an experimental device for simulating natural gas hydrate formation cementing. Background technique [0002] As a clean new energy with huge resource potential, natural gas hydrate is widely distributed in the porous media of terrestrial permafrost and seabed strata on the continental margin, and has been favored by more and more countries in the world. However, since natural gas hydrates only exist stably under high pressure and low temperature conditions, any change in temperature or pressure during drilling in hydrate-bearing formations may cause hydrate decomposition, cause wellbore instability, and cause serious drilling accidents and economic losses. loss. In order to complete the exploration, evaluation and exploitation of natural gas hydrate, well cementing is an essential and key technical means. [0003] Althoug...

AI Technical Summary

Problems solved by technology

However, no experimental device capable of simulating the actual cementing environment has been developed so far, and it is impossible to study the conduction law of the hydration heat of cement slurry in the hydrate-bearing formation near the borehole wall and its influence on the formation temperature and hydrate stability. In situ testing and data acquisition analysis

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