EMERGENCY SHUTDOWN VALVE RELIABILITY FUNCTION TEST BY AUTOMATED PARTIAL STROKE TESTING SYSTEM

2016 ◽  
Vol 78 (7-4) ◽  
Author(s):  
Borhanuddin Ahmad ◽  
Norhaliza Abdul Wahab ◽  
Amirah A. Rahman
Keyword(s):  
Oil And Gas ◽  
Reliability Function ◽  
Automated System ◽  
Design System ◽  
Testing System ◽  
Matlab Simulink ◽  
Emergency Shutdown ◽  
Valve Position ◽  
Flow Through ◽  
Pst System

Partial stroke testing (PST) is a technique that is regularly practiced in oil and gas industries to test the emergency shutdown (ESD) valve by closing a certain percentage of the valve position and stop any flow through the pipeline. Generally, it only functions when there is an emergency occurring in the production system. When the ESD valve remains in one position for a long period, there is a risk and potential of fail on demand which is, the ESD valve fail to operate during the emergency shutdown. This testing can reveal approximately 75% of unrevealed failures in valves. It can also provide predictive maintenance data that can contribute to the extension of the preventive maintenance for the ESD valve. The objectives of this paper are to design, simulate, build and test the performance of the automated PST system based on PLC. Four guidelines and methodology are used in this work. First, understanding the operation of the PST system. Then, the utilization of the capability of MATLAB-Simulink software as the simulation tool for the PST design system. Next, designing the PST automated system based on PLC design and lastly, testing the performance of the PST design system using lab scale PST system prototype that has been built. Results of the project shows that the PST system is successfully designed and simulated via MATLAB-Simulink and the PLC programming is working in the correct order as performed on the prototype.

Research on Experimental Method for the Working Force between Packer Rubber and Casing Tube

2014 ◽  
Vol 518 ◽  
pp. 138-143 ◽  
Author(s):  
Zun Ce Wang ◽  
Feng Xia Lv ◽  
Meng Yu Cao ◽  
Hou Zhen Wen ◽  
Yan Xu
Keyword(s):  
Oil And Gas ◽  
Normal Pressure ◽  
Research Process ◽  
Experimental Result ◽  
Testing System ◽  
Maximum Deviation ◽  
Gas Wells ◽  
Location Data ◽  
Oil And Gas Wells ◽  
Experiment Method

On application of BDI STS-WIFI testing system and Dasylab software, the testing process for strain of the casing tube with the packer rubber being seated is carried out. From the process the different friction force and normal pressure of specified seating pressure are achieved, by which the empirical formula is matched. Setting the experimental result as the boundary condition, the calculation result of the practical location of the five-stage packer on basis of oil and gas wells rod string mechanics is obtained, the maximum deviation of which is 0.1m compared with the magnetic location data. The research process on the experiment method proves its accuracy in laboratory while promoting the precision of the block location of the multistage packer in practical well casing tube.

A FRACTAL SCALING LAW BETWEEN TORTUOSITY AND POROSITY IN POROUS MEDIA

Fractals ◽  
2020 ◽  
Vol 28 (02) ◽  
pp. 2050025
Author(s):  
PENG XU ◽  
LIPEI ZHANG ◽  
BINQI RAO ◽  
SHUXIA QIU ◽  
YUQING SHEN ◽  
...  
Keyword(s):  
Porous Media ◽  
Chemical Engineering ◽  
Oil And Gas ◽  
Scaling Law ◽  
Morphological Characteristics ◽  
Fractal Model ◽  
Statistical Characteristics ◽  
Scale Model ◽  
Reservoir Water ◽  
Flow Through

Hydraulic tortuosity is one of the key parameters for evaluating effective transport properties of natural and artificial porous media. A pore-scale model is developed for fluid flow through porous media based on fractal geometry, and a novel analytical tortuosity–porosity correlation is presented. Numerical simulations are also performed on two-dimensional Sierpinski carpet model. The proposed fractal model is validated by comparison with numerical results and available experimental data. Results show that hydraulic tortuosity depends on both statistical and morphological characteristics of porous media. The exponents for the scaling law between tortuosity and porosity depend on pore size distribution and tortuous fractal dimension. It has been found that hydraulic tortuosity indicates evident anisotropy for asymmetrical particle arrangements under the same statistical characteristics of porous media. The present work may be helpful to understand the transport mechanisms of porous materials and provide guidelines for the development of oil and gas reservoir, water resource and chemical engineering, etc.

Numerical Analysis of Flare Gas Recovery Ejector

2014 ◽  
Author(s):  
Arihant Sonawat ◽  
Abdus Samad ◽  
Afshin Goharzadeh
Keyword(s):  
Fluid Flow ◽  
Flow Rate ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Gas Industry ◽  
Gas Recovery ◽  
System A ◽  
Primary Fluid ◽  
Recovery System ◽  
Flow Through

Flaring and venting contributes significantly to greenhouse gas emissions and environmental pollution in the upstream oil and gas industry. Present work focuses on a horizontal flow, multiphase ejector used for recovery of these flared gases. The ejector typically handles these gases being entrained by high pressure well head fluid and a comprehensive understanding is necessary to design and operate such recovery system. A CFD based analysis of the flow through the ejector has been reported in this paper. The flow domain was meshed and the mass and momentum equations for fluid flow were solved using commercial software CFX (v14.5). Euler-Euler multiphase approach was used to model different phases. The entrainment behavior of the ejector was investigated and compared for different fluid flow conditions. It was observed that for a fixed primary fluid flow rate, the entrained or secondary flow rate decreased linearly with an increase in pressure difference between exit and suction pressure. The higher was primary flow rate, the greater was the suction created ahead of the primary nozzle and greater was the amount of energy added to the entrained fluid.

Developing Turnaround Maintenance (TAM) Model to Optimize TAM Performance Based on the Critical Static Equipment (CSE) of GAS Plants

2019 ◽  
Vol 01 (01) ◽  
pp. 12-31
Author(s):  
Abdelnaser Elwerfalli ◽  
M. Khurshid Khan ◽  
J. Eduardo Munive-Hernandez
Keyword(s):  
Oil And Gas ◽  
Reliability Function ◽  
Operating Conditions ◽  
Normal Operation ◽  
Tam Model ◽  
Third Stage ◽  
Inspection And Maintenance ◽  
Oil And Gas Companies ◽  
A Company ◽  
Gas Plants

Many oil and gas companies have suffered major production losses, and higher cost of maintenance due to the total shutdown of their plants to conduct TAM event during a certain period and according to scope of work. Therefore, TAM is considered the biggest maintenance activity in oil and gas plant in terms of manpower, material, time and cost. These plants usually undergo other maintenance strategies during normal operation of plants such as preventive, corrective and predictive maintenance. However, some components or units cannot be inspected or maintained during normal operation of plant unless plant facilities are a totally shut downed due to operating risks. These risks differ from a company to another due to many factors such as fluctuated temperatures and pressures, corrosion, erosion, cracks and fatigue caused by operating conditions, geographical conditions and economic aspects. The aim of this paper is to develop a TAM model to optimize the TAM scheduling associated with decreasing duration and increasing interval of the TAM of the gas plant. The methodology that this paper presents has three stages based on the critical and non-critical pieces of equipment. At the first stage, identifying and removing Non-critical Equipment pieces (NEs) from TAM activity to proactive maintenance types. During the second stage, the higher risk of each selected equipment is assessed in order to prioritize critical pieces of equipment based on Risk Based Inspection (RBI). At the third stage, failure probability and reliability function for those selected critical pieces of equipment are assessed. The results of development of the TAM model is led to the real optimization of TAM scheduling of gas plants that operated continuously around the clock in order to achieve a desired performance of reliability and availability of the gas plant, and reduce cost of TAM resulting from the production shutdown and cost of inspection and maintenance.

scholarly journals Modeling Water Balance of Dammed Lakes Using Computer Code Matlab-Simulink/ Modelowanie Bilansu Wodnego Piętrzonych Jezior Za Pomocą Programu Komputerowego Matlab-Simulink

2014 ◽  
Vol 14 (3) ◽  
pp. 5-14
Author(s):  
Ryszard Błażejewski ◽  
Sadżide Murat-Błażejewska ◽  
Martyna Jędrkowiak
Keyword(s):  
Water Balance ◽  
Computer Code ◽  
Water Levels ◽  
Time Interval ◽  
Lake Surface ◽  
Time Intervals ◽  
Matlab Simulink ◽  
Surface Evaporation ◽  
Flow Through ◽  
Good Agreement

Abstract The paper presents a water balance of a flow-through, dammed lake, consisted of the following terms: surface inflow, underground inflow/outflow based on the Dupuit’s equation, precipitation on the lake surface, evaporation from water surface and outflow from the lake at which a damming weir is located. The balance equation was implemented Matlab-Simulink®. Applicability of the model was assessed on the example of the Sławianowskie Lake of surface area 276 ha and mean depth - 6.6 m, Water balances, performed for month time intervals in the hydrological year 2009, showed good agreement for the first three months only. It is concluded that the balancing time interval should be shorter (1 day) to minimize the errors. For calibration purposes, measurements of ground water levels in the vicinity of the lake are also recommended.

Development of operational costs controlling within automated control system

10.12737/2426 ◽  
2014 ◽  
Vol 8 (4) ◽  
pp. 11-14
Author(s):  
Гиниятуллин ◽  
Yunir Giniyatullin
Keyword(s):  
Control System ◽  
Oil And Gas ◽  
Management Strategies ◽  
Oil Production ◽  
Cost Accounting ◽  
Production Costs ◽  
Automated System ◽  
Automated Control ◽  
Associated Gas ◽  
Automated Control System

In the current economic conditions it is particularly important to create reliable cost information, using the tools of the automated system operational controlling. Lack of an effective system of controlling of cost and management accounting often leads to problems in the development of management strategies by financial results and cost’s of oil production enterprises. ERP-system is currently possible to develop an effective strategy of cost management , but the controversial issues are the choice of objects of managerial cost accounting of oil and gas company, develop options for synthetic and analytical cost accounting group, using the 30 accounts and specific analytical grouping costs, creating transformation models of cost elements, costs of processes and costs, collected in their places of origin in the cost of oil and associated gas. According to a survey of large and marginal companies of the Republic of Tatarstan and the Russian Federation, in the article we presented the content and relationship diagram of objects of costs controlling within automated enterprise management system, the classification of costs for primary and secondary, codes of 30th accounts, reflecting costs elements, the composition of the oil activities companies, which are formed in the context of costs according to the principles of the ABC method and the scheme of the formation of oil production costs within the automated control system of the company (SAP). The recommendations allow you to develop the costs controlling concept, as at group level and at the level of Oil and Gas Management.

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