A few days ago, a spring cold suddenly attacked the Dagang oil area, but there was a warm feeling in the office of the Exploration and Development Research Institute in the Dagang Oilfield. It turned out that the duty personnel of the operation and maintenance of the geothermal heating system adjusted the temperature of the outlet in advance according to the weather changes.
The geothermal heating and cooling project of the Research Institute of Exploration and Development is the first shallow geothermal demonstration project built by Dagang Oilfield, and also the first shallow ground source heat pump system heating and cooling project of PetroChina, which is a new breakthrough in accelerating the development of new energy business and building an integrated energy service enterprise in the oilfield.
Abandon experience and design and construction accurately
Geothermal energy is a renewable energy buried in the ground, which has the characteristics of green, low-carbon, recyclable and stable and reliable. According to Li Fuguo, a researcher at the Research Institute of Exploration and Development, Dagang Oilfield is rich in geothermal resources, and through the development of shallow geothermal heat pump systems, it can use the relatively stable temperature underground to achieve integrated heating and cooling, and is recognized as the most energy-efficient and environment-friendly heating system so far.
In terms of working principle, Li Fuguo introduced: "Because the shallow underground soil has a constant temperature, it can be used as a storage for thermal energy. In the summer, the air conditioning unit evaporates through the refrigerant, absorbing heat and storing it underground; in winter, the heat of the underground soil can be used for compressor work, so that the refrigerant releases heat again during the condensation process. At this time, the heat can be sent to the office through the heat pipeline. ”
In the face of many difficulties in the first construction, the company has increased its technical research and development efforts and overcome one technical difficulty after another. Among them, one of the more difficult problems is that the formation heat transfer parameters, well type and well spacing are only referenced by empirical values, and there is a lack of shallow geological data in the oil area. In order to obtain reliable geological data, the Dagang Oilfield Exploration and Development Research Institute carried out geotechnical thermal property tests, calculated the reasonable spacing of the heat exchange holes, and formulated and improved the accurate and feasible feasibility study plan. In line with the principle of high efficiency, economy and demonstration, make full use of the original heating station air conditioning circulation pump and collector foundation, and build 641 double U-shaped shallow energy conversion wells, which coincides with the code name "641 Plant" in the early stage of development and construction of Dagang Oilfield. At the same time, in accordance with the principle of "remote control + local automation control", the intelligent control system is improved and the stability of the system operation is improved.
The geothermal project took 90 days to complete and was officially put into operation on November 9, 2021, with a heating and cooling area of nearly 50,000 square meters, opening a new era of green heating in the oilfield office area.
Intimate service, efficient operation and maintenance management
After the geothermal heating system is put into operation, the operation and maintenance pipe protection is particularly important, which is directly related to the quality of heating.
The reporter learned that in order to improve the quality of heating operation and maintenance, Dagang Oilfield Land Management Service Company has set up a professional team of geothermal development, utilization and operation and maintenance management composed of more than 30 geothermal operation and maintenance professionals, and has successively held business training such as shallow geothermal system operation and maintenance, central air conditioning operation and maintenance, machine room operation and maintenance management, and organized personnel to observe and improve operation skills at the ground source heat pump site of the Haibin Street Office.
Ji Changbin, an employee of the company's operation and maintenance post, told reporters that they have to patrol key parts such as heating equipment and pressure gauges every day, 10 times a day under normal circumstances, and if they encounter bad weather, they will increase the frequency of inspections, and everyone has developed the habit of reading the weather forecast in advance.
In order to improve the operation efficiency of the geothermal heating system, under the premise of ensuring that the office temperature reaches 22-24 ° C when employees go to work, the operation and maintenance personnel pay attention to the outdoor temperature changes in time and scientifically adjust the temperature of the outlet, which not only ensures the orderly progress of the production office, but also saves the power consumption. At the same time, the company also cooperates with the Dagang Oilfield Information Center to control various types of machinery and production operation processes through remote signal transmission, further compressing staffing and operating costs.
After the geothermal energy heating and cooling project was put into operation, Hu Jinnan, deputy director of the public utilities department of the Oilfield Exploration and Development Research Institute, obviously felt that the work pressure was much less, and he called him to reflect that the problem was no longer complaining, and the employees feedback said that the office was warm as spring, and they praised geothermal energy heating.
Yang Jie, director of the Geothermal Development Center of Dagang Oilfield Land Management Service Company, said that since the project was put into operation, the shallow geothermal heating system of the Exploration and Development Research Institute has been running smoothly for more than 120 days, reducing carbon dioxide emissions by more than 700 tons while meeting the winter heating demand. The promotion of shallow ground source heat pump technology will help achieve the "double carbon" goal, which is more than 30% more energy-saving than traditional central air conditioning.
Scientific layout, to create a demonstration brand
The Dagang Exploration Area is rich in geothermal resources, from shallow to deep. Its development and utilization does not emit pollutants and greenhouse gases, which can reduce the consumption of fossil fuels and the ecological damage in the process of fossil fuel mining, and has a significant effect on the improvement of natural environmental conditions and ecological environmental protection.
Dagang Oilfield fully implements General Secretary Xi Jinping's strategic thinking on promoting energy production and consumption revolution and the spirit of the important speech of "promoting clean heating in winter in northern China", seizes the important opportunity to promote the in-depth development of the energy revolution, relies on innovation in technology, management and development mode, builds a demonstration zone for the development and utilization of geothermal energy, actively serves the external market, and makes Dagang Oilfield a comprehensive energy service enterprise with advanced technology, environmental friendliness and considerable benefits in Tianjin。
The implementation blueprint is all about implementation. Dagang Oilfield has formed a fire brigade, a drilling company, a reception service center, and a shallow geothermal utilization project in the area of Haibin People's Hospital around the gas boiler substitution in the oil area, which is currently undergoing feasibility study and strives to be completed and put into operation in 2022. The development and utilization projects of medium and deep geothermal energy in Hualong Area, Bohai Equipment Zhongcheng Company and Engineering and Technology College Area are also preparing feasibility studies, and it is expected that project construction will be realized within this year。 By the end of the "14th Five-Year Plan", Dagang Oilfield is expected to achieve geothermal heating of more than 6 million square meters, with an average annual reduction of carbon dioxide emissions of 28,000 tons, equivalent to the annual absorption of 1,100 mu of forest.
In the process of developing and utilizing geothermal resources, Dagang Oilfield focuses on infrastructure construction and builds an oilfield geothermal service brand。
Strengthen the talent reserve internally and increase technical cooperation externally. Strengthen talent reserves through introduction, recruitment, etc., lay the foundation for the smooth realization of "going out for development", carry out advanced technology observation in the same industry, build a bridge for cooperation between colleges and universities, pay attention to the combination of technology introduction and wisdom introduction, work together to overcome technical problems, and lay a technical foundation for better and faster development of geothermal business.
Promote projects with the market and promote science and technology with projects. Find out the key indicators such as geothermal resources, water volume and temperature of the block, scientifically and accurately select the development area, and comprehensively carry out two-way research on potential market and technological upgrading to ensure the realization of mutual promotion and win-win work goals。
Optimize system operation and build a demonstration brand. Revise the "Measures for the Management of Geothermal Development in Dagang Oilfield", reasonably set operating parameters, enhance economic operation capabilities, accelerate the construction of two platforms of "geothermal application simulation" and "digital intelligence", and create a "petroleum version" geothermal application demonstration brand with characteristics and highlights。
Aiming at the geothermal energy demand of the three markets of "inside the Dagang Oilfield, inside the oil system, and around the outside of the oil area", in line with the principle of "clean energy, optimal solution, and maximum benefit", the pioneering and enterprising Dagang Petroleum people have joined the new round of energy revolution, made every effort to draw the blueprint of the "14th Five-Year Plan" geothermal planning, and contributed to the realization of the "double carbon" goal.