Through a systematic analysis of the engineering characteristics of oilfield development and construction projects, this paper discusses the main production and discharge nodes in the exploration and construction process of onshore oilfields. It analyzes and evaluates the nature and degree of soil environmental impacts that may occur during the construction, operation, and retirement periods of oilfield development projects. The paper also studies the key and difficult points of soil environmental impact assessment of onshore oilfield development projects after the implementation of the new guidelines. It points out that the focus of soil environmental impact assessment of oilfield development and construction projects should be on soil environmental impact identification, soil environmental quality status evaluation, soil environmental impact prediction and soil environmental protection measures.

In order to ensure the intrinsic safety of chemical processes and the timeliness of complex accident handling, appropriate risk assessment methods should be selected. A risk assessment method combining F&EI, HAZOP, and AHP was proposed. F&EI analysis provides a data basis for the preliminary analysis of HAZOP and determines the intrinsic safety of each unit, so that HAZOP analysis only analyzes units that do not meet the safety essence; conducting quantitative AHP analysis on its high-risk evaluation units improves the primary and secondary accuracy of the analysis results. Finally, taking the explosion accident of crude nitrobenzene in a certain factory as an example, the paper demonstrates that the information transmission and sharing among the three methods make the risk assessment process of complex accidents more convenient and efficient, and the risk assessment results are clearer and more reliable.

In recent years, explosion accidents occurred frequently in the storage of hydrogen peroxide, so it is necessary to improve the intrinsic safety of its storage based on the thermal decomposition explosion characteristics of hydrogen peroxide. This paper presents the intrinsic safety design of hydrogen peroxide storage in a project. From the aspects of unit volume specific surface area, temperature rise of self-accelerating decomposition reaction, safety distance and discharge area, heat dissipation, etc., the process parameters of hydrogen peroxide storage are determined through two levels of design and calibration in order to reduce the risk of thermal explosion and to meet the requirements of intrinsic safety.

Circulating hydrogen compressor is the key equipment of hydrofining unit. Its normal operation plays a decisive role in the long cycle operation of the device. In the recent operation cycle, a measuring point at the driving end of the compressor prime mover turbine vibrated intermittently for 66 times, which affected the safe and stable operation of the unit to a certain extent. During operation, the status monitoring system was used to analyze the problem and some measures were taken to deal with it, yet the problem was not solved from the source. During the process of device shutdown and overhaul, the turbine was disassembled and the vibration inducement was found out. It has been running normally after treatment. This paper introduces this phenomenon and its causes, which provides reference for troubleshooting of other similar equipment.

In petrochemical production, hydrogenation unit is a high-pressure hydrogen device, which is prone to accidents of high-pressure materials backflowing to low-pressure systems. The lesson of the "3.12" high-pressure materials backflowing to low-pressure accident of the hydrogenation unit in a SINOPEC enterprise in 2018 is very profound. In order to prevent the high pressure materials from flowing back to the low pressure system, risk assessment should be carried out on the process flow, equipment and system interlock to find out the risk points of accidents and formulate safe and reliable preventive measures. Through design modification, hidden dangers can be eliminated to ensure that the device meets the intrinsic safety conditions and to nip the dangers in the bud.

Stray current in town is the key factor that causes corrosion in buried natural gas pipeline. In this paper, based on the monitoring results of underground pipeline potential under the operation of the subway, the corrosion behavior of X65 steel under different DC interference conditions including anode interference, cathode interference, dynamic interference and cathodic protection was studied by electrochemical experiments and corrosion morphology analysis. The results showed that compared with the anode interference and dynamic interference, the corrosion potential of X65 steel was negative and the corrosion current density was smaller under the conditions of no interference and cathode interference. This indicated that the corrosion rate of X65 steel was smaller. Under dynamic interference, the corrosion rate of metal was slightly higher than that of anode interference. In this case, the metal surface was in the alternating process of positive-negative potentials, presenting serious pitting characteristics.

Organic metal ultrafiltration membranes have good hydrophilicity and hydrophobicity during oil-water separation and filtration, which make them resistant to pollution and less prone to clogging. In the oil removal experiment conducted by using organic metal ultrafiltration membrane, the oil removal device using organic metal ultrafiltration membrane can operate stably for more than one month at a membrane flux of 30LMH, and the average removal rates of petroleum and SS are 76.8% and 76.6% respectively. The produced water for petroleum and SS is stable and meets the standards, with the highest being only 10.3mg/L and 23mg/L respectively, which is nearly 50% lower than the effluent indicators required by the air flotation process. The operation difficulty of the oil removal device using organic metal ultrafiltration membrane increases at a membrane flux of 40LMH. The combined cleaning of CEB and CIP can effectively extend the stable operation cycle of the membrane and ensure the stable operation of the system. The organic metal ultrafiltration membrane process can replace the traditional air flotation treatment process at a membrane flux of 30LMH.

By analyzing the production history and mechanism of hydrogen sulfide formation in a certain oilfield, a targeted hydrogen sulfide treatment plan for the production process is formulated, and two treatment agents are used on site to treat hydrogen sulfide pollution in the oilfield production process. The results of detecting the concentrations of SO42- , S2-, VFA and hydrogen sulfide in on-site production water indicate that both agents have significant treatment effects. In terms of hydrogen sulfide concentration and production, the treatment effect of Agent I is better than that of Agent II; both drugs have a promoting effect on the proliferation of beneficial bacteria NRB and the inhibitory effect on SRB.

The Emission Standard of Pollutants for Petroleum Refining Industry (GB31570-2015) sets clear control targets for total nitrogen. One petrochemical company carried out standard upgrading before the new standard was issued. On the basis of the original process, facilities involving denitrification biological filter and sand filter tank were added. The reverse osmosis concentrated water was treated by ozone oxidation, denitrification, air floatation, sand filtration and activated carbon. After such revamp, the operation has been stable; the quality of effluent has been good and the effluent discharge of sewage has reached the standard steadily for five consecutive years. The experience of such revamp after standard upgrading can provide reference for other enterprises.

This paper provides a brief introduction to traditional elevated torches and ground torches and analyzes their advantages and disadvantages in detail. It systematically elaborates on the structure and working principles of the open ground torch, as well as the complete set of process systems covering staged combustion system, fuel gas system, nitrogen purging system and smoke suppression steam system. From the actual operation effect, the open ground torch is a good solution to the environmental technical problem of "black smoke" when the torch gas is released in large quantities in a short period of time. Meanwhile, the paper proposes the feasible optimization operation plans for the common problem of high nitrogen content in the flare gas system.

Acrylonitrile/acrylic fiber wastewater has a high concentration of pollutants and contains oligomers that are difficult to be treated biochemically and has become a problem for enterprises to discharge wastewater up to standard. This paper introduces the engineering practice and experimental research of acrylic fiber wastewater treatment in domestic enterprises and the engineering practice of treating acrylic fiber wastewater by PACT/WAR process. The engineering operation shows that the treatment effect of this process is good for oil refining and chemical wastewater including acrylonitrile/acrylic fiber wastewater. It can achieve the first level of direct discharge standard. Aiming at the problems in operation, the corresponding solutions and optimization suggestions are put forward.

With the rapid development of modern computer technology, convenient product development system plays an irreplaceable role in improving the design accuracy, shortening the design cycle, reducing the design cost and so forth. It has been widely applied in various industrial fields. Through the establishment of chemical cleaning dynamic simulation experiment platform, this paper proposes a dynamic simulation experiment measurement and control system for industrial chemical cleaning that can automatically read, calculate and analyze experimental test data. This is helpful to reduce unnecessary human and material consumption in the actual operation process and reduce the generation of cleaning waste liquid, which is of great significance for energy conservation and emission reduction.

In this paper, 14 kinds of volatile halogenated hydrocarbons in the exhaust gas of stationary sources were analyzed by gas chromatography and air bag sampling. The curve correlation coefficient of each component was greater than 0.99; the detection limits of the method were from 0.0003 mg/m3 to 0.6 mg/m3. This method was adopted to test the real samples from iron and steel enterprises, petrochemical plants and auto repair factories. The relative standard deviation of spiked samples in various industries were from 1.2% to 8.8% and the recoveries were from 74.3% to 116%. All the characteristic indexes of this method can meet the expected requirements. This provides a more direct and effective method for the analysis of volatile halogenated hydrocarbons in the exhaust gas of stationary sources.

The prevention and control of soil pollution by petroleum hydrocarbons in petroleum and petrochemical industry is one of the emphases of environmental management. Risk control or remediation of soil polluted by petroleum hydrocarbons is needed in order to reduce the environmental risks of soil pollution by petroleum hydrocarbons. This paper reviews the present status of soil pollution by petroleum hydrocarbons and environmental effects. It presents the current research progress and application of remediation technologies for soil pollution by petroleum hydrocarbons. The paper also compares the advantages and disadvantages of different remediation technologies and proposes the development direction for the remediation technologies of soil polluted by petroleum hydrocarbons.

The development of shale gas, an unconventional energy source, will help improve China's energy structure. The National Energy Administration of China has included it in the national strategic emerging industry, which is also one of the five high-end novel growth industry plans in Sichuan Province. Drilling waste fluid is one of the most representative wastes in the drilling process. The drilling waste fluid has the characteristics of a large amount of production, complex composition and high treatment cost. Therefore, study on the treatment of drilling waste fluid is critical for the sustainable development of the surrounding environment of drilling operations sites. The research results indicate that this research has taken the apparent viscosity, plastic viscosity, dynamic shear force and medium pressure filtration loss of drilling fluid as the main indexes to study the influence of different concentration factors on the performance of drilling fluid. Combined with the numerical simulation of the Box-Behnken module in the software of Design Expert, the requirements for the preparation of polysulfonate drilling fluid by recycling water-based drilling fluid are determined.