Constructive characteristics of the electric heating system in cold conditions in the Mohair area
The Mohe Basin is a Mesozoic fault-depression-converted basin, and the degree of breeding in the basin is very low. According to the geological study of outcrops in the field in combination with the current drilling and seismic data of a comprehensive study, it is concluded that the Erzhan formation and the Emulkha formation 2 are widely developed in the area. This combination of the main nephtheme rocks, the thermal evolution of organic matter is in a mature-high-mature stage, Reservoirs are being developed, and oil and gas deposits are all sandstones and volcanic rocks, and oil and gas sources are relatively rich. But its geographical position is special, it belongs to an extremely cold environment, the lowest temperature can reach-50 ° C. Consequently, pipelines in extremely cold conditions must rely on electric heating systems to maintain pipeline temperatures in place to ensure safe production. The oil and gas project in extreme cold conditions is a project that includes the most complete types of electric heating equipment, the highest reliability and the largest software management. The products cover all product series of major electric heating manufacturers.
Thus, the electric heating system is a strong current operating system. If the construction and debugging work is not done properly, it is very easy to have problems such as cracks freezing, burning and fire, and failure to repair, with incalculable consequences. The cost increases and, more importantly, affects the safety of production. Thus, the electric heating system is an operating system with a strong current. If the construction and debugging work is not done properly, it is very easy to have problems such as cracks freezing, burning and fire, and failure to repair, with incalculable consequences. The cost increases and, more importantly, affects the safety of production.
Compared to conventional projects, the design of electric heating systems for oil and gas projects in extreme cold conditions is more complex and rigorous and has the following characteristics:
1. There are many intermediate processes, long paths and multiple control points. The entire route of the power cable of the electric heating system in an extremely cold environment is more complicated than that of conventional projects. In the middle, many intermediate process control elements are added, such as: intermediate junction box, temperature control unit, automatic switch, temperature sensor, etc. D. Incorrect or incorrect installation of each process will directly lead to the collapse of the entire system.
2 Compared to normal projects, the project for extreme cold conditions has increased the communication path and centralized control system, which greatly increases the requirements for design accuracy and debugging complexity. An example is as follows: The data of each thermostat must be returned to the UIT centralized control system via the RS485communication link. The centralized control system requires very accurate data at the bottom end. During construction, the length of each loop must be strictly consistent with the design length. If there is an error in any link during installation, the entire system will not be able to debug successfully.
3. Taking into account factors such as maintenance at a later stage, a backup circuit is added to each main heating circuit.
Summing up, we can say that the electric heating system in extremely cold conditions has its own characteristics, ranging from the design and choice of electric heating to the principle of operation, which is very different from conventional projects. Whether it is a designer or construction personnel, they must have a deep understanding of the characteristics of the system and materials in order to master the key stages of the project construction process and ensure the quality of the project construction. Shandong Huaning has long been dedicated to providing comprehensive electric heating solutions for industrial, commercial and civil markets, and has obtained a third-level qualification for professional contracting for building electromechanical plant design and second-level qualification for professional contracting for waterproof, anti-corrosion-corrosion and thermal insulation engineering; with years of experience and technical knowledge, To provide customers with more comprehensive design, supply, quality assurance, installation and maintenance services.
Electric heating cable is a heating method that uses insulation resistance or resistance heating wire to create a temperature after power supply. It can automatically adjust the output temperature and reasonably maintain the process temperature requirements to keep warm, raise the temperature and protect the heating equipment from freezing. The insulation and antifreeze effect of the container is very good.
Transport of heavy oil through the pipeline over long distances and long-term retention in the pipeline will result in a drop in temperature due to heat dissipation and increased viscosity, which will cause the pipeline to be blocked by freezing or condensation-related accidents. Electric heating is widely used as effective insulation of pipelines and anti-freeze protection.
According to the statistics of the Hydrometeorological Center, the average daily minimum temperature at the location of the CNPC tank farm is 5 ° C, and the average daily maximum temperature is 14 ° C. Since the freezing point of the PX is about 15 °C, the supply pipeline needs heat preservation and heating. The oil depot has been in operation for many years without a stable source of steam, therefore, this project is considering the use of electric heating technology.
Long-distance crude oil pipelines with a high paraffin content with freezing temperatures above 50 °C. According to the requirements of the production plan of the plant, the volume of oil transportation through the pipeline is 150 thousand rubles. Tons per year, maximum-200 thousand. Tons per year.. According to the thermodynamic analysis of the pipeline, the initial supply temperature of the pipeline is 80 ° C (TN), and the temperature of the end entering the tank is 60 ° C (Tu). Since the transportation temperature needs to be adjusted according to the time of year, it sometimes needs to be transported by heat.
In petrochemical engineering, trunk infusion pipelines are the lifeblood of the factories. The temperature in the northern region is too low in winter and the pipeline needs to be insulated to compensate for the heat loss due to the low temperature in winter to ensure the normal operation of the pipeline.
The toughness of the asphalt is greatly affected by the temperature. When the temperature decreases, the toughness of the asphalt increases, and the drop in resistance of the asphalt during pipeline transportation increases; when the temperature falls below the freezing point, the asphalt solidifies, causing the pipeline to clog and the conveyor belt to come to trouble. Therefore, electric heating and heat preservation during the transportation of asphalt are very important.
To solve many problems in the "three high levels" crude oil extraction process, the thermal energy generated by the electric heating is used to heat the crude oil in the oil pipe throughout the process to improve the fluidity of the crude oil. Effectively solve various technical problems encountered in the operation of high-condensation, high-viscosity and high-paraffin crude oil, and achieve the goal of improving the productivity and efficiency of oil wells.