Shallow soil layer mechanical parameter monitoring method of freeze soil area natural gas hydrate drilling holes

Abstract

The invention discloses a shallow soil layer mechanical parameter monitoring method of freeze soil area natural gas hydrate drilling holes. The shallow soil layer mechanical parameter monitoring method includes the steps: strengthening a well bottom; placing a cylindrical capsule into the well bottom; connecting a T-shaped stainless steel pipeline; extracting water in the cylindrical capsule; calculating pressure of pore fluid in a soil layer; pressing water into the cylindrical capsule by a liquid filling pump; calculating modulus and strength of the soil layer and the like. By the aid of online monitoring technique of long-term c in-situ rock and soil mechanics, the freeze soil area hydrate drilling holes are reasonably used, change rules of mechanics and pore fluid pressure parameters of shallow soil layers of the freeze soil area natural gas hydrate drilling holes are obtained, measurement scientificity, accuracy and reliability of pore fluid pressure and reservoir mechanics are further improved, technological level of shallow-layer natural gas hydrate reservoir exploitation of our country is improved, and environmental effect evaluation practicability and scientificity are improved.

Description

technical field [0001] The invention belongs to the technical field of natural gas exploitation, and in particular relates to a method for monitoring mechanical parameters of shallow soil layers in natural gas hydrate drilling holes in permafrost regions. Background technique [0002] At present, shallow exploration of natural gas hydrate reservoirs in my country's permafrost regions has carried out multiple drilling wells to obtain parameters such as thickness and depth of natural gas hydrate reservoirs. At the same time, the temperature and pressure in the drilling are mainly measured by temperature sensors and pressure sensors. Distribution. Due to the short drilling period, the disturbance in the drilling process has a great influence on the pore fluid pressure of the soil layer and the mechanical parameters of the reservoir, and the wellhead requires the sensor size, it is difficult to accurately obtain the shallow reservoir during the drilling process. Pore ​​fluid pre...

AI Technical Summary

Problems solved by technology

Due to the short drilling period, the disturbance in the drilling process has a great influence on the pore fluid pressure of the soil layer and the mechanical parameters of the reservoir, and the wellhead requires the sensor size, it is difficult to accurately obtain the shallow reservoir during the drilling process. Pore ​​fluid pressure evolution, reservoir soil mechanics and other parameters

Images