Table of Content

20 June 2019, Volume 55 Issue 3

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Engineering Design and Standards

The Difference Analysis on Long Distance Pipeline Emergency Control Technology at Home and Abroad

2019, 55(3):  0-0. 

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Oil and gas leakage, fire explosion and other emergencies have become a major risk factor for long-distance pipelines. Making scientific emergency plan and response disposal procedure can effectively control oil and gas diffusion and reduce accident loss. China have no special pipeline emergency control standard, and with problems such as inconsistent emergency disposal, poor operability and cohesion of emergency plan. The paper introduced the advanced experiences and practices of the United States, Canada and Russia in pipeline emergency response, including accident command system （ICS）based on modularization and resource optimization as an organization for emergency response. The first responder exercises the command power of the initial control and rescue of the accident. According to the nature and severity of the accident to carry out the quantitative classification of the accident, and the emergency site sub-regional management and the field pollutant control.In addition, it also included medical rescue, pipeline public warning program, pipeline operators and news media communication, emergency plan change timeliness, diverse emergency plan drill. Finally, according to the actual situation of China oil and gas pipeline, the developing suggestions on emergency control technical specification of oil and gas pipeline in China were put forward.

Reflections and Discussion on The Correlation Between Instrument and Special Equipment

2019, 55(3):  0-0. 

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The instrument related to special equipment has not paid enough attention to safety supervision. Whether these instrument should be required by special equipment is not clear enough. The direct cause of the explosion of the "8 ? 11" major high-pressure steam pipeline in Dangyang, Hubei Province is the instrument problem. According to the laws and regulations of special equipment, this paper analyzes and considers the special equipment properties of instrument equipment associated with boiler, pressure vessel, pressure piping, etc.. The discussion of the requirements in "State Administration for Market Regulation's Notice[2018] No. 515" . Elaborated the flow measurement and manufacturing requirements on the "three major pipelines" of the boiler. The case of special equipment properties such as pressure vessels and pressure pipelines that may be superimposed by instrument equipment is analyzed. In this paper, the problems that users should pay attention to in the selection and purchase of instrument equipment are discussed and put forward.

Clause Reaction and Combustion Control for SRU

2019, 55(3):  0-0. 

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In the sulfur recovery unit of foreign natural gas processing plants, clause burners have various feeds, strict control requirement and complicated control schemes. Through the detailed description of the ratio control, cascade control and feed forward control of fuel gas, acid gas, H2S and SO2 combustion, the instrument control parameters are elaborated, which effectively improves the combustion efficiency of the clause burner, which makes the emission of flue gas pollutants reach the environmental protection standard, and the overall automatic operation level of the control loop is improved, and the operational reliability of the device is improved.

Design of Multi-container Control System Based on PCS7

2019, 55(3):  0-0. 

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Taking reactors and flash tanks, which are common in industry, as the controlled objects, Analysis of processes and control requirements, and Comprehensive consideration of production safety, energy consumption. The control schemes of feed flow, reactor temperature, liquid level of reactant, flicker tank pressure and product flow are designed.. Using Siemens PCS7 DCS and process control training system(SMPT-1000), the reactor control system is implemented. The control results show that the design of control system is reasonable, reliable and it meets the technological requirements.

Process and Technology

Optimal Design of Induction Motor for Electric Forklift

2019, 55(3):  0-0. 

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A 24V, 4-pole and 36-slot low voltage and high current induction motor was taken as an example. Considering the performance of the induction motor, take six parameters, such as stator slot width, slot depth, slot depth and rotor slot, are selected as variables, and the maximum torque, starting torque and efficiency are taken as optimization objectives. The computer aided motor design software ANSYS EM and Taguchi orthogonal experiment were used to verify the influence of relevant parameters on the performance of the motor. The optimization of target optimum parameters is achieved, and the multi-objective optimization design of the motor is realized.

Dynamic Soft Sensing Method Based on Multi-model Fusion and Time-delay Variables Selection

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Time-delay and nonlinearity are two main problems leading to bad predicting accuracy in the soft sensing of industrial process. Aiming at these problems, a dynamic soft sensing method based on multi-model fusion and time-delay variable selection is proposed in this paper. At first, a time-delay variable selection strategy is introduced, in which the evaluation index of joint mutual information is defined according to comentropy, the optimal time-delay variables and historical data length are obtained using spiral optimization algorithm under maximal mutual information index. Then, combining the advantages of Gaussian model and regular extreme learning machine, the prediction of industrial process parameters are realized by the dynamic cross-fusion between two models. At last, for the application of actual debutanizer device, the partial least squares, least square support vector machine and proposed method are used to solve the soft sensing problems. Simulation result shows that the proposed method has good predicting accuracy and robustness.

Development and Application of Follower Control Technology for Pumping Unit Load

2019, 55(3):  0-0. 

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In this paper, the oil and gas well pumping unit is introduced to automatically change the speed in a single cycle according to the change of the downhole load, simulate the artificial lifting force, improve the pumping efficiency and save the energy. The system uses the method of summarizing the dynamometer card, analyzes the pumping load change curve, looks for load mutation spikes, compares the change pattern of the load curve in the upstroke and downstroke of the pumping unit, and finely controls the pumping speed to one mining cycle, the curvature of the sucker rod is reduced, the effective stroke is increased, the mechanical impact of the pumping unit is reduced, the underground production pump is filled with as much liquid as possible, the service life of the pumping unit is prolonged, and the application purpose of increasing production and reducing consumption is achieved.

Research on Control of Electric Loading System Based on SAPSO-FNN

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Aiming at the nonlinearity caused by the use of reducer in electric loading system, thispaper presents a method based on simulated annealing particle swarm optimization algorithm to optimize the initial parameters of fuzzy neural network PID controller. In this method, the fuzzy neural network based on Mamdani model has used to self-tune the PID controller parameters through online BP learning algorithm, and the initial value of fuzzy neural network is adjusted offline with particle swarm optimization algorithm based on simulated annealing. Through simulation and experiment, the comparison among the algorithm designed in this paper and the incremental PID controller and particle swarm-fuzzy neural network PID controller proves that the controller designed in this paper has good stability, validity and rapidity.

Instrument and Meter

The application of Fiber Warning System in monitoring the real-time trajectory of Pig

2019, 55(3):  0-0. 

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Pigging in oil and gas pipeline transportation is an important, necessary and what’s more a high-risk operation. With the vapid developing of the pipeline transportation, the demand for real-time trajectory monitoring of pigging devices is increasing. This paper introduces the application of the Fiber Warning System (FWS) in monitoring the real-time trajectory of pig. The vibration signal produced by the pig can be detected and located by the FWS, so the real-time trajectory monitoring of the pig can be realized. The real-time trajectory monitoring result of the pig in a product oil pipeline shows that the monitoring and positioning performance of the system is good, and this system has important practical value.

Research on Configuration of Leakage Detection System Based on Negative Pressure Wave

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Innovation and Practice

Analysis on the Method of Product Oil Interface Monitoring Based on SCADA System

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Talking about the Error Analysis in the Online Verification of Scraper Flowmeter

2019, 55(3):  0-0. 

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The accuracy of crude oil trade measurement is directly related to the economic benefits of enterprises.This article analyzes the main influencing factors in the online verification process of the volumetric scraper flowmeter in detail ,which starts with the accuracy and compliance of measurement.It explores ways to improve the accuracy of verification, and puts forward corresponding improvement measures,which ensures the accuracy of metering.

Application of Flow Demarcate in Flow Measurement System of Oil Pipeline

2019, 55(3):  0-0. 

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With the rapid development of China's economic construction, the demand for petroleum energy is increasing day by day. While the scale of refining units is expanding, the construction of domestic and international oil pipelines is also accelerating. The metering transfer of these oil products is mostly carried out through various forms of flowmeters, and the metering data of flowmeters is the sole basis for trade transfer, so the accurate calculation of flowmeters appears to be very important. This paper mainly expounds several on-line flow demarcate methods of flow measurement system, which are commonly used both in china and abroad, and provides some enlightenment for designers in the rational application and design of flowmeter calibration.

A brief discussion on the design and application of the automatic control system of the Simulated fire training equipment for dangerous chemicals

2019, 55(3):  0-0. 

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Through the professional training of firefighters and commanders of simulated fire training devices, the problems of inadequate emergency rescue solutions and inadequate personnel training were effectively solved. The automatic control system is to simulate real fire process design requirements of an important link. To achieve local control, remote control and center operation, Puyang base’s control system design of real fire simulation is consists of three control methods: the PLC system of central control, field control, remote control. Aiming at the possible faults in the training process, the protection functions of flameout protection, the emergency stop button protection, the combustible gas leakage protection, the overtemperature protection,and the power failure protection have ensured the safety of the training personnel and equipment, moreover, satisfactory effects have gained.

Intelligentization and Information Technology

Research and application of digital remote monitoring cabinet for casing cathode protection in tube-type well group

2019, 55(3):  0-0. 

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Aiming at the shortcomings of digital remote monitoring and control of casing cathodic protection in cluster wells in Changqing Oilfield, full-time personnel are required to inspect and manage the casing cathodic protection. A digital remote monitoring cabinet for cathodic protection of cluster well group is developed. The monitoring cabinet is mainly composed of current and voltage instrument unit for monitoring cathodic protection, adjustable DC power supply switching power supply unit and highly integrated remote control terminal RTU module unit. It has the advantages of high operating efficiency, safe pressure regulation, small volume, light weight, low input cost, convenient networking, stable and reliable data transmission, powerful functions and so on. It can carry out cathodic protection for cluster casing and realize digital remote monitoring. From 2016 to 2017, more than 60 cluster wells in Changqing Oilfield were applied in the field, which realized digital remote monitoring without full-time personnel management.

An effective any-angle path planning method for robot

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As a new manner of any-angle path planning algorithms that can planning path without constraining caused by iteration step , this paper introduce a method to search a path which has shorter path length and lower turning-vertices between two vertices in a map．By establishing a newly special geometry vertices, named Gate-vertices, and analysis parent attributes of these Gate-vertices, this algorithm successfully expanding path information to neighbor vertices on an effective and fast way. It’s expanding pattern like Dijstra algorithm, but it also include heuristic factor derived from A* algorithm to accelerate its speed and focus goal direction.

Remote monitoring system for offshore oil field ESP Design and Application

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At present, terrestrial and offshore platforms are mainly communicated and exchanged by telephone and e-mail. It is difficult to reappear all kinds of production well data in real-time to land control and dispatching center. Land oil well production managers and reservoir analysts can not obtain real-time production well performance data. Therefore, it is necessary for offshore oilfields to improve the various data acquisition systems of production wells, develop a set of production wells data remote monitoring system, provide timely analysis data for production management of oil wells, and improve oil field production efficiency. This article will introduce the design of remote monitoring system in detail.