A system to monitor and avoid secondary formation during hydrate decomposition

Abstract

The invention discloses a system for monitoring and avoiding secondary generation in the process of hydrate decomposition, which includes a decomposition casing pipeline, a resistivity detection probe, an external power supply heating device, and a data collection and analysis interconnection device; wherein, the decomposition The casing pipeline adopts a rigid casing structure, and the inner and outer sides of the pipe wall are made of rigid structural materials. A heating element is arranged inside the casing, and the heating element is connected to the external power heating device; the resistivity detection probes are distributed at intervals In the unsleeving pipeline; the data acquisition and analysis interconnection device is used to analyze the received resistivity detection probe signal, and determine whether to issue a control command to start the external power heating device through the heating element according to the analysis result. Disassemble the casing line for heating. This system can effectively monitor and avoid the secondary generation of hydrate during the process of hydrate decomposition, and prevent the phenomenon of pipeline blockage.

Description

technical field [0001] The invention relates to the technical field of pipelines, in particular to a system for monitoring and avoiding secondary generation in the process of hydrate decomposition. Background technique [0002] As a kind of clean energy, natural gas hydrate is widely distributed in the deep seabed and land permafrost. A large number of hydrate gas reservoirs have also been found in the South my country Sea. If they can be utilized, the huge gas hydrate contained in these The amount of methane storage can greatly alleviate the energy crisis that our country is about to face. In November 2017, natural gas hydrate was officially listed as the 173rd new mineral in my country. Therefore, in the context of the current relative energy shortage, the exploitation and utilization of natural gas hydrate will receive more and more attention. [0003] At present, the commonly used natural gas hydrate production methods mainly include depressurization method, heat inject...

AI Technical Summary

Problems solved by technology

However, since hydrate decomposition is an endothermic reaction, a large amount of hydrate decomposition will lead to a decrease in local temperature in the decomposition area. At this time, the gas pressure in the well pipe is relatively high, and the water generated during the decomposition process cannot be completely removed. The decomposed methane and water co-exist in this area, and the gas and water easily regenerate hydrate locally under the conditions of low temperature and high pressure, which will reduce the permeability of the near-wellbore reservoir and even block the wellbore. Reduce the gas production rate and total gas production, which can easily lead to safety accidents

[0004] At the same time, in the natural gas transportation pipeline, due to similar circumstances, the gas and water in the pipeline can easily form hydrates to block the pipeline and cause safety accidents

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