Research On The Resistivity Measurement Method Of Gas Hydrate

The gas hydrate (natural gas hydrate, NGH) is considered as a kind of high-quality and clean energy in 21st century, which has aroused the researchers, widespread attentions. The characteristics and measurement method of resistivity have important theoretical and practical significances for the determination of development, storage and transportation ways, and enhancing oil recovery on gas hydrate before exploring and developing the gas hydrate. So the problem on the resistivity measurement of gas hydrate is further researched and proposed a solution in this article.Firstly, the background of detection technology and the development status quo at home and abroad on gas hydrate are introduced briefly in this article, and then the main contents of the subject, technical path and organizational structure are all elaborated.Secondly, it presents the research in three areas on this topic in detail after the main frame of this topic is introduced, which are the design and calibration of electrode array test unit for measuring the resistivity, the hardware design, installation, software development and debugging of one-dimensional resistivity measurement device on gas hydrate. In the design and calibration of electrode array test unit, the characteristics of measuring resistivity with electrode array are discussed. The basic working principle of measuring resistivity with electrode array, the derivation of theoretical model and experimental methods for calibrating the electrode array test unit are mainly researched. The method of measuring the resistivity with electrode array is analyzed. Meanwhile, the body of electrode array and its power supply module for a special suitable living environment of the gas hydrates has been designed according to the characteristics of measurement device on gas hydrate. During designing hardware of the measurement device, the principle and characteristics of one-dimensional resistivity measurement device on gas hydrate are mainly introduced, and then the overall designing program and system workflow of the measurement device are proposed. Meanwhile, the features of data acquisition module and controlling module which are chosen in this device are introduced in detail. It focuses on the data acquisition and controlling unit, and finally the design of hardware circuit is given. During designing the software, the systematic architecture of application software is given through analyzing the requirement. The procedural designing idea of the key functional modules has been discussed, including the data collection module, the controlling module, the communication module of the balance and the database module, and then the preparation of the relevant code and functional test has completed. The test results show that the software is in line with the designing requirements.Finally, during the experiment of the formation and decomposition on the gas hydrate, the resistivity changes on the measuring point of the gas hydrate region has been measured with the one-dimensional resistivity measurement device on gas hydrate. The feasibility of the measurement method has been verified, which provides a new technology for the exploration of the gas hydrate.