The interval of a company’s device overhaul has been gradually extended from three years to four years or longer, so the previous HSE security system for device overhaul can no longer adapt to the development of the situation well. In order to deal with such change, the company has carried out a series of dynamic optimization programs including making good deployment of the program before the major overhaul; improving the quality of safe delivery, increasing the depth of prefabrication and avoiding cross operation; improving the intermediate process monitoring and acceptance to ensure the construction quality; controlling the quality of material procurement strictly; and promoting the standardization of on-site management vigorously with a view to laying a solid foundation for achieving overall control of safety and environmental protection.

The “smart construction site” has been promoted and applied in the field of construction engineering, and the related technology has become quite mature and standardized. However, petroleum and petrochemical sites involve complex processes, so the promotion of “smart construction site” is relatively slow. As a petroleum and petrochemical project involving complex processes, intelligent technologies covering such technological measures as BIM technology application, intelligent video monitoring, safety monitoring of construction operations, environmental protection and control of internet of things and labor function management and innovative management were researched and explored in Dongying Crude Oil Depot Relocation Project of Shengli Oilfield so as to create a “safe, green, intelligent, efficient and humane” site. The achievements of the project by far include the standardization of the site, the regularization of the scene, the proceduralization of the management process, informationization of internal management and the technicalization of the monitoring means. The experience of this relocation project can be promoted and replicated in the petroleum and petrochemical construction sites. And this relocation project is of demonstrative significance and can play a leading role in the construction of standardized smart construction sites with good application prospects. 

Safe construction of petrochemical projects is related to the safety of national property and people’s lives. This paper analyzed the shortcomings of common safety supervision work in petrochemical projects. Aiming at these shortcomings, it proposed such solutions as adhering to the guidance of party building and national laws and regulations and improving safety supervision and management continuously; strengthening key areas and implementing special rectification measures; emphasizing personnel training and cultivating safety management team with strong business skills; optimizing the system, clarifying responsibilities and stressing the importance of responsibilities; focusing on management of areas with frequent hidden dangers on sites; enhancing contractor management and carrying out emergency drills regularly and so forth. The paper suggested that enterprises should explore the safety supervision mode suitable for their actual situation in order to maximize the elimination of hidden dangers in the onsite construction of petrochemical projects. 

For production and storage plants involving key regulated hazardous chemicals, key regulated hazardous chemical processes and major sources of danger for hazardous chemicals, a hazard and operability analysis (HAZOP) should be conducted every three years. In order to improve the effectiveness of HAZOP analysis of in-service plants, achieve the goal of regular HAZOP analysis of in-service plants, identify possible safety and operational risks in the operation of in-service plants timely and accurately, and avoid repeating the content of HAZOP analysis of newly built plants, this paper analyzed the purpose of HAZOP analysis of newly built plants and in-service plants. By comparing and contrasting the purpose of implementation, participating units, focus and analysis, and the implementation of recommended measures, this paper explained the differences in HAZOP analysis for new plants and in-service plants, and proposed the direction and focus of HAZOP analysis for in-service plants. This provided a reference for effective HAZOP analysis of in-service plants. 

 The oil and gas processing system on offshore platform has realized standardized design. Although the standardized design of offshore platform can shorten the development cycle and reduce the investment cost, it will not reduce the potential risks of the new platform, and may even increase some risks because of the shortened construction period. In this paper, HAZOP analysis was carried out for the standard process of oil and gas treatment on offshore platforms to identify the causes and consequences of detailed deviations. And protective measures were suggested to minimize risks. The analysis results are universal, which can provide effective reference for hazard identification and prevention of process systems. This paper proposed protective measures based on the causes and consequences of hazards, which can effectively reduce the frequency of occurrence or mitigate the consequences of accidents, thus achieving the goal of preventing risks and guaranteeing the safe operation of the equipment

 According to the safety risk analysis of offshore heavy oil thermal recovery process. The possible safety risk factors of offshore platform steam flooding thermal recovery production process are classified. The possible consequences of risk factors are assessed and graded based on preliminary hazard analysis and risk matrix method, in order to promote the risk identification and hidden danger rectification work of thermal recovery, The research results have certain guiding significance for the construction of double prevention mechanism of thermal recovery in offshore heavy oil fields.

 In this paper, a pneumatic fine coke removal equipment for delayed coking fractionating column was developed by adopting pneumatic dust removal technology through flow field simulation, optimization design and experimental verification. This equipment can effectively reduce the fine coke content in the product of coking fractionating column. After the application of this technology, the pressure drop from the wax oil riser to the top of the fractionating column decreased from 176kpa to 144kpa, which had virtually no effect on the operation of the fractionating column. The average backwashing time interval of raw material filter in hydrofining unit was extended from 16.4 minutes to 48 minutes, and the backwashing cycle was significantly extended. The average fine coke content in coking diesel oil decreased from 43.57 mg/l to 7.02 mg/l. The fine coke removal rate reached more than 80% and the effect was as expected. Meanwhile, the technology has the advantages of low operating cost, small footprint, high coke removal efficiency and less likely to be plugged.

 Installing and operating online monitoring systems for oil and gas recovery at gas stations makes it possible to realize real-time, continuous, automated, unaffected operation, and timely detection of problems in the operation of the oil and gas recovery system. However, the unstable data from the frequent occurrence of gas-liquid ratio and other common faults have brought new difficulties. Analyzing the faults and mastering the solutions can make the equipment operate more efficiently for a longer period of time and reduce the pollution caused by oil and gas volatilization to a greater extent. Therefore, this paper puts forward suggestions on several common faults and treatment methods of online monitoring systems, hoping to bring help to the daily operation of gas stations. 

According to the basic structure and technological process of dry gas seal and combined with the actual cases of dry gas seal leakage at the non-driving end of circulating hydrogen compressor, this paper statistically analyzed the trend of the leakage gas flow rate of the main seal at the non-driving end and the change law of the related parameters, and investigated the possible causes of the leakage. Then countermeasures were developed to prolong the service life of dry gas seals in terms of equipment and process. After 10 months of operation, the dry gas seal failed due to leakage, and the device stopped and the failed seal was replaced. Later, the company disassembled the dry gas seal body, analyzed the direct and indirect causes of the failure, and put forward suggestions for rectification

By comparing the working principles of several sets of oil and gas recovery units, this paper proposes that the absorption process is at the core of the oil and gas recovery unit according to the law of conservation of mass, and its absorption efficiency plays a decisive role in whether the oil and gas recovery can operate normally. From the analysis, it is found that in the absorption process, the main factors affecting the absorption efficiency are the absorption liquid, gas-liquid ratio, and the temperature of the absorption liquid. Through optimizing the absorbent, controlling the temperature of the absorption liquid and optimizing the absorption process, the absorption efficiency can be improved comprehensively, which can provide guarantee for smooth oil and gas recovery and gas discharge up to standard.

The cracking furnace of the 220 kt/a ethylene plant of Dushanzi Petrochemical Company has adopted LUMMUS technology from the United States. It has been expanded from 140 kt/a to 220 kt/a since July 2002 and has been in production since then. There are altogether seven cracking furnaces in the ethylene plant. During normal production and operation, six cracking furnaces are in normal operation state, and one cracking furnace is in decoking air standby state, and the decoking air in the standby cracking furnace is completely empty. At present, the tower kettle temperature of the quench water tower is low; the tower kettle provides insufficient heat for heating, and the high temperature of the decoking air in the standby cracking furnace causes high-temperature oxygen corrosion to the furnace tube. In the cracking device, it is proposed to dilute steam in the decoking air standby cracking furnace, and connect the standby cracking furnace with the quench system to recover part of the heat and reduce the risk of high-temperature oxygen corrosion in the furnace tube when the decoking air is in high-temperature standby state, and reduce the emission of high-temperature coke burning gas.

The water yield from the chemical wastewater reuse unit of a petrochemical company cannot meet the production needs. This paper analyzes this problem. Through systematic review and cause analysis of the feeding water of the chemical wastewater reuse system, the operation of the ultrafiltration device and the plugging of the reverse osmosis membranes, the optimization measures are developed. By reasonably adjusting water sources, optimizing the treatment effect of pretreatment BAF device, improving the ultrafiltration cleaning scheme, optimizing the reverse osmosis chemical cleaning scheme and so forth, the cleaning cycle of reverse osmosis was extended to 25 days, and the indicators of ultrafiltration and the recovery rate of reverse osmosis system and desalting rate were close to the design value. And the average daily water yield of the chemical reuse system was gradually increased from the daily average of 2,958.8 tons to 3,497.6 tons. The operation was more stable and the expected results were achieved. 

Liaohe Oilfield is the largest heavy oil production base in China. The output of heavy oil accounts for more than 60% of the total output, and the water content of heavy oil produced fluid reaches more than 70%. The daily output of sewage is large, and the treatment is difficult. In order to effectively improve the quality of conventional treatment of heavy oil sewage, this paper put forward the quality control measures of “subsection control and subsection compliance” according to the characteristics of conventional treatment process of heavy oil sewage and combining with the production status. It studied the setting principles of quality control points, analyzed the factors influencing each index of quality control, and formulated quality control points and corresponding management measures scientifically. These have ensured the smooth operation of the conventional treatment process of heavy oil sewage and improved the quality management of sewage treatment process.

This paper introduced the properties and characteristics of solid waste from drilling old wells in oil and gas exploration and technical principles and treatment process of biodegradation. It focused on analyzing the restoration effects of biodegradation technology on two old wells of the Southwest Oil & Gasfield Company. The results showed that the index of harmful heavy metallic elements in the soil treated and restored by biodegradation technology did not exceed the index in the Soil environmental quality Risk control standard for soil contamination of agricultural land (GB 15618-2018) (other, pH > 7.5, risk screening value); the pollutant index of soil leachate can meet category class 5 water quality requirements in Environment quality standard for surface water (GB3838- 2002). The solid waste from drilling after biodegradation treatment can be used as afforestation and planting soil. After treatment, the soil is relatively poor in nutrients and can be supplemented with targeted organic, phosphate and nitrogen fertilizers to replenish nutrients for further use. It is feasible to adopt biodegradation technology to treat and utilize the residual solid waste from drilling old wells in oil and gas exploration and turn them into general plantable soil, which can not only eliminate the environmental hazards of old wells, but also turn the land occupied by the solid waste into arable land, thus realizing ecological restoration and sustainable development. 

The current situation of China’s atmospheric environment is still severe, and hazy weather is frequent in autumn and winter. Key industries shall carry out emergency work for heavily polluted weather in accordance with the Technical Guide for Formulating Emergency Emission Reduction Measures for Key Industries in Heavy Pollution Weather. In the emergency work for heavily polluted weather in refining and petrochemical industry enterprises, there is no detailed description of the real vapor pressure calculation method, no clear definition of the control scope of the “relevant tanks”, no detailed description of the concept of tank “turnover”, no detailed description of the “pre-warning” characterization of the time period, no explanation of the tanks and loading control qualification standards and there is no detailed description of the calculation method of the turnover of tanks and other issues. Therefore, this paper put forward targeted recommendations and listed the advanced practices of excellent enterprises for the reference of enterprises in the refining and petrochemical industry and governmental ecological and environmental departments, with a view to contributing to the implementation of emergency measures for heavily polluted weather and the improvement of air quality. 

Modern coal chemical industry is a high water-consuming industry and produces a large amount of wastewater. IMC is a multi-stage short-range nitrification and denitrification process technology characterized by strong shock resistance, high degree of automation and low operating costs, which is suitable for treating coal chemical wastewater. Based on the process characteristics and optimized design of IMC, the removal rates of COD, BOD, ammonia nitrogen and total nitrogen by IMC process in practical application in the coal chemical wastewater treatment of certain project in Shaanxi were greater than 95%, 97%, 99% and 96% respectively. This can ensure that the coal chemical wastewater effluent meets the discharge standards. The treated products are CO2 and N2 and no secondary pollution is generated.