With the extensive use of oil and gas resources, the downhole pressure and temperature are gradually rising in the exploration, drilling and production stages of oil and gas wells, and the depth of exploration and development is also increasing.
High-temperature and high-pressure wells are different from ordinary wells, first of all, in terms of temperature. Generally speaking, the bottom hole temperature of the oil well exceeds 150°C, the wellhead pressure exceeds 70MPa, and the bottomhole pressure is close to or greater than 105MPa. Due to their characteristics, high-temperature and high-pressure wells require better equipment than conventional wells, resulting in a significant increase in operational difficulties and risk factors, and a significant increase in safety incidents. Electrical sensors in high-temperature environments no longer have a clear advantage. In view of the harsh environment of oil and gas downholes, two kinds of temperature and pressure sensors based on optical fiber are proposed, which can work for a long time in high temperature and high pressure environments, and an effective solution is proposed for the long-term monitoring of oil and gas downhole temperature and pressure.
Optical fiber oil well high temperature and high pressure monitoring technology is an all-fiber downhole temperature and pressure monitoring technology developed by using the principle of fiber grating and optical fiber F-P cavity, which has the advantages of high temperature resistance, corrosion resistance, long-term stability and real-time data compared with traditional electronic sensors. Real-time and online understanding of the temperature and pressure information of oil and gas wells is of great significance for optimizing the oil production process and guiding the oil production process. The Canadian FISO Fiber Optic Temperature Sensor - FOT-L-SD is a class of fiber optic temperature sensors that are very suitable for measuring temperature in j-end environments, such extreme environments include low temperatures, nuclear environments, microwaves, and high-intensity RF. The FOT-L combines all the excellent features you would expect from an ideal sensor body. As a result, these sensors provide highly accurate and reliable temperature measurements even in extreme temperatures and adverse environments. The main features of both FOT-L temperature sensors are complete immunity to EMI and RFl, as well as their small size, built-in safety devices for hazardous environments, high temperature resistance, corrosion resistance and high accuracy.
Another area where fiber optic sensor technology is widely used in oil well monitoring is pressure monitoring In the process of high depth oil well industry, pressure monitoring is very important, traditional oil well monitoring technology generally uses copper and other sensors, but these sensors will be damaged in high temperature and high pressure environments, fiber optic sensor technology can work in high temperature and high pressure environment, can continuously monitor the pressure of oil wells, and formulate appropriate control strategies by analyzing the changes of photoelectric signals, so as to better maintain the safety of oil wells
The application of fiber optic pressure sensors is very extensive, especially for pressure measurement in harsh environments, which can show its superiority. For pressure detection in oil wells, it is very convenient to use fiber optic pressure sensors. Canada FISO Fiber Optic Pressure Sensors - FOP-C are primarily used in general industrial applications in harsh and hazardous environments where high pressures are usually present. In addition, the FOP-C fiber optic pressure sensor has the advantages of size, high accuracy, EMI/RFI immunity, and corrosion resistance.
The FOP-C fiber optic pressure sensor is based on the well-established Fabry-Perot interference principle. The unique design of the sensor is based on contactless segregation measurement of stainless steel diaphragms, which is very different from conventional pressure measurement techniques. Pressure changes can cause changes in the length of the Fabry-Perot interferometric cavity, and our fiber optic signal conditioners can measure the length of the interferometric cavity with consistently high accuracy, even in extremely harsh environments in temperature, EMI, humidity, and oscillating environments. The sensor's robustness is guaranteed by its all-welded stainless steel construction and the absence of epoxy-based resins, sealants, and any other form of polymer material. The FOP-C fiber optic pressure sensor measures up to 10,000 psi, making it ideal for any scientific application where high pressures are present. In these extreme environments, we can provide different lengths and types of fiber optic lead cables.