A device and method for on-site identification and cutting of natural gas hydrate intervals in casing

Abstract

The invention relates to the technical field of natural gas hydrate exploration, in particular to a device and method for on-site identification and cutting of natural gas hydrate intervals in a casing. The device includes a temperature measuring unit and a cutting unit arranged horizontally with the temperature measuring unit. The temperature measurement unit includes a temperature measurement housing, a temperature measurement transparent cover, a mobile temperature measurement mechanism, a temperature measurement inlet, a temperature measurement outlet, and a casing transfer mechanism. The cutting unit includes a cutting shell, a cutting transparent cover, a moving sleeve clamping and cutting mechanism, a cutting inlet, a cutting outlet and a loading platform. The invention can realize the integrated operation of identification and acquisition of hydrate-containing layers in the casing, improves the rate of hydrate sample acquisition, and reduces the loss in the process of obtaining hydrate from the casing. In addition, sampling accuracy is also improved by the constraint of actually measuring temperature differences. The powder generated during the operation can be controlled in the equipment for centralized treatment, avoiding dust pollution on the construction site.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate exploration, in particular to a device and method for on-site identification and cutting of natural gas hydrate intervals in a casing. Background technique [0002] Natural gas hydrate (hereinafter referred to as "hydrate") is considered to be a potential green and clean energy in the 21st century, and its commercial exploration and development technology has always been an important direction for governments to explore and develop. An important engineering node in its industrial process is to obtain samples of hydrates in the rock formations under the seabed in deep sea environments. The successful acquisition of the samples is an affirmation of the understanding of hydrate occurrence laws in the previous stage and a verification of the accuracy of the collected data. The trial production of hydrates in the engineering stage provides strong support for physical testing and scheme desi...

AI Technical Summary

Problems solved by technology

However, hydrates will decompose automatically when exposed to the air in field operations. The existing technology is inefficient in accurately identifying and cutting hydrate samples in the casing, resulting in a large loss of hydrate samples during the collection process, which affects follow-up work. Research and testing on the occurrence state of in-situ hydrate under the seabed

In addition, because there is no scale and other marks used to indicate the specific horizon in the casing, the accuracy of cutting the horizon is not high, which also causes the loss of hydrate samples

[0004] At present, there is no complete device and scheme to directly complete the above work. Therefore, it is urgent to design a device and method that can identify and cut the natural gas hydrate interval in the casing in an integrated manner.

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