Sensor suhu serat optik INNO ,sistem pemantauan suhu.
The principle and advantages of DTS
The distributed fiber optic temperature measurement system is sensitive to temperature based on the principle of optical time-domain reflection and Raman scattering effect to achieve temperature monitoring. The entire system uses fiber optic as the carrier for sensitive information sensing and signal transmission, which has the characteristics of continuous temperature measurement, pengukuran suhu terdistribusi, pengukuran suhu waktu nyata, resistensi interferensi elektromagnetik, keamanan intrinsik, pemantauan jarak jauh, sensitivitas tinggi, instalasi mudah, dan umur panjang. It is widely used in industries such as municipal comprehensive pipe galleries, saluran pipa, terowongan, kabel, minyak bumi dan petrokimia, and coal mines.
How to monitor oil well pressure
Hydraulic fracturing is a key technology for efficient development of unconventional oil and gas reservoirs and hot dry rocks. By using hydraulic fracturing to transform the reservoir and forming a fracture network structure in the reservoir, the oil and gas production of oil and gas wells can be effectively increased and the heat production of the geothermal system (EGS) can be strengthened. Karena itu, the artificial fractures formed by hydraulic fracturing are a direct reflection of the effectiveness of reservoir fracturing transformation and an important basis for evaluating the production capacity of hydraulic fracturing wells. Saat ini, methods such as microseismic monitoring and production logging are commonly used to monitor the hydraulic fracturing process and post fracturing production process. These methods have high implementation costs and complex operations, making it difficult to accurately monitor the fracturing process and production process of multi-stage fracturing artificial fractures. Lebih-lebih lagi, microseismic monitoring belongs to far-field monitoring, which is subject to many external interference factors and has poor accuracy. Karena itu, it is particularly important to seek a near-field monitoring method that can simultaneously monitor the hydraulic fracturing process and post fracturing production process.
With the development of distributed fiber optic temperature monitoring (DTS) Dan pemantauan suara serat optik terdistribusi (ITU) teknologi, it provides an important means for real-time monitoring of hydraulic fracturing processes and post fracturing production monitoring. The main principle of DTS technology is to use the reflection principle of optical fibers and the temperature sensitivity of reverse Roman scattering of optical fibers, mengandalkan hubungan kuantitatif antara perambatan cahaya dalam serat optik dan perubahan suhu di sekitar media serat optik untuk menentukan suhu di lokasi media serat optik. Prinsip utama teknologi DAS adalah menggunakan prinsip pengukuran refleksi domain waktu optik yang koheren untuk menyuntikkan laser pulsa pendek yang koheren ke dalam serat optik.. Ketika getaran eksternal bekerja pada serat optik, struktur internal inti serat akan sedikit berubah karena efek optik elastis, mengakibatkan perubahan sinyal hamburan Rayleigh belakang dan perubahan intensitas cahaya pantulan yang diterima. Dengan mendeteksi perubahan intensitas sinyal cahaya hamburan Rayleigh sebelum dan sesudah kejadian downhole, peristiwa aliran fluida downhole saat ini dapat dideteksi dan ditempatkan secara akurat, sehingga mencapai pemantauan dinamika produksi downhole secara real-time. Karena karakteristik interferensi anti elektromagnetik, ketahanan terhadap korosi, dan kinerja real-time yang bagus, serat optik memiliki keunggulan lebih besar dalam pemantauan dinamis produksi bawah tanah secara real-time.
During hydraulic fracturing, a large amount of low-temperature fracturing fluid enters the high-temperature formation, resulting in a decrease in temperature around the fracturing interval; Pada saat yang sama, when fracturing fluid enters the fracturing layer to create fractures, extend fractures, and flow in fractures, a large amount of noise is generated. The larger the cracks formed by the fracturing layer, the higher the temperature drop and the greater the noise amplitude. The use of highly sensitive and high-precision distributed fiber optic temperature and sound sensing technology can monitor in real time the position and quantity of ground layer fracturing, as well as the volume of fracturing fluid entering the fracturing formation, and thus infer the approximate geometric parameters of the cracks.
During the post production process, a large amount of fluid in the reservoir flows into the wellbore through cracks instead of reservoir matrix. When the fluid flows through the dense reservoir matrix and through cracks filled with proppants, different frequencies of noise are generated due to the physical differences in the medium, and the intensity of the noise is related to the flow rate; Selain itu, due to differences in reservoir temperature, thermal characteristics of oil and water, and density of oil and water, fluids with different flow rates and compositions will exhibit different temperature and sound velocity differences when flowing into and in the wellbore from cracks at different positions. By using high sensitivity and precision suhu serat optik terdistribusi and sound sensing technology, this temperature and sound velocity difference can be perceived, and then combined with corresponding mathematical models for interpretation, the production profile of the fractured well can be obtained, and effective fractured intervals can be determined and the fracturing effect evaluated.
Characteristics of DAS distributed fiber optic acoustic vibration sensing host system
The DAS distributed fiber optic acoustic vibration security sensing detection system can accurately locate the location of the incident, dengan akurasi tinggi, waktu respons yang cepat, kekebalan terhadap interferensi elektromagnetik, isolasi listrik, fiber optic nature, and explosion-proof characteristics. Karena itu, it can be directly used in environments with different levels of perimeter security needs.
The DAS fiber optic perimeter security sensing system consists of distributed fiber optic hosts, detection optical cables, dll.. The distributed sensing system is widely used and reasonably priced.
DAS distributed fiber optic acoustic vibration sensing host system product functions
1. It can monitor vibration over long distances, with high positioning accuracy and stable system operation;
2. 24-hour real-time online monitoring without the need for manual duty, automatic alarm or device activation when exceeding the upper and lower limits of the warning, achieving high efficiency;
3. Short training time and convenient software operation;
Characteristics of DAS distributed fiber optic acoustic vibration sensing host products
1. FJINNO DAS fiber optic demodulator adopts independently developed advanced chips, which have fast processing speed, keandalan yang tinggi, and low power consumption;
2. Fiber optic sensors themselves have characteristics such as electrical insulation and immunity to electromagnetic interference, and can be directly used in hazardous materials such as petrochemicals;
3. Not easily affected by external environment.
Traditional temperature sensors are easily affected by lightning, especially for electrical temperature sensors. Distributed fiber optic sensors are completely electrically insulated and can resist the effects of high voltage and high current;
4. The laying density of fiber optic sensors can be set independently to meet the actual needs of various temperature measurement hotspots;
Application field of DAS distributed fiber optic acoustic vibration products
Online monitoring of natural gas pipeline leaks
Online monitoring of oil pipeline leaks, dll..
Sensor suhu serat optik, Sistem pemantauan cerdas, Produsen serat optik terdistribusi di Cina
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