Design And Implementation Of A Simulate Monitoring System For Formation Water Influx During Gas Drilling Based On ZigBee

Gas drilling is a new type of drilling technology, which has the advantage of improving the production and drilling speed, which is more and more widely used at home and abroad. Gas drilling with air or nitrogen gas as medium return cuttings, in drilling if encountering formation water will cause sticking and hole collapse, will give normal drilling to bring great risk. It is of great significance to rapidly and effectively identify formation water and predict the change of formation water, which is of great significance to the safety of gas drilling. At the same time, gas drilling site usually in the wild, some areas exist blind area of mobile network operators, the ZigBee network can effectively solve the mobile network in oil field of blind area coverage problem, and has the characteristics of low power consumption, multi node and strong reliability, suitable for scene monitoring of gas drilling, is conducive to the use and promotion of the technology.In the process of gas drilling, the relative humidity of the gas will be increased, so that the formation water can be judged by monitoring the humidity of the return gas. This topic has used the laboratory designed has the characteristic of quick response type humidity sensor, according to the gas drilling formation water phenomenon in the laboratory to build the formation water simulation environment, and combined with ZigBee technology a multi node monitoring system is designed. The monitoring system is composed of three parts:the simulation environment, the sensing system of monitor the gas relative humidity and temperature data, and the monitoring center program based on the C# language, which has the function of real-time display, prediction and so on.The relative humidity of the humidity sensor is fitted and quantified, which can measure the relative humidity of the environment. When the water quantity in simulation environment is not the same, the relative humidity of the humidity sensor is different, which verifies the feasibility of the simulation environment and the monitoring program. The hardware system of wireless sensor network based on ZigBee and CC2530 is designed, and the sensing, display, transmission and reception of the return gas humidity and temperature are completed. C# language used to develop the monitoring center program, to achieve the ZigBee coordinator and the monitoring center of the serial communication between the program, in the monitoring center program to monitor the relative humidity and temperature of the return gas in real time. After analyzing the changing trend of the relative humidity of the formation water, the gray Verhulst data prediction model is selected, and the related parameters of the prediction algorithm are determined by different forecasting examples. Based on the relative humidity data collected in real time, the prediction of relative humidity change in a period of return gas was realized, and the MATLAB and C# mixed programming was implemented to monitor the data prediction algorithm. Monitoring of system commissioning, validate the feasibility of the novel humidity sensor and feasibility of formation water discharge in gas drilling monitoring combined with ZigBee technology of the system, the system can quickly judge formation water in gas drilling simulation environment, water more, relative humidity value is greater, the system in a certain extent can recognition of formation water. At the same time, the system of return gas relative humidity change has some forecast function, forecast the change of formation water in real-time monitoring at the same time.