96Rajesri GOVINDARAJUHasian P.Septoratno Siregar97The Development of Framework for Manufacturing Execution Systems Design and Implementation(Project 2014)Mathematical Modeling for Intermittent Gas Lift to Maximize Oil Production Rate in Low Productivity Well(Project 2014)Manufacturing execution system is information systems (IS) application that bridges the gap between IS at the top level, namely enterprise resource planning (ERP), and IS at the lower levels, namely the automation systems. MES provides a media for optimizing the manufacturing process as a whole in a real time basis. By the use of MES in combination with the implementation of ERP and other automation systems, a manufacturing company is expected to have high competitiveness. In implementing MES, functional integration -- making all the components of the manufacturing system able to work well together, is the most difficult challenge. For this, there has been an industry standard that specifies the sub-systems of a manufacturing execution systems and defines the boundaries between ERP systems, MES, and other automation systems. The standard is known as ISA-95. The purpose of this study is to develop a methodology describing how MES implementation project should be managed, utilising the support of ISA-95 reference model in the system development process. A proposed methodology was developed based on a general IS development methodology. The developed methodology were then revisited based on the understanding about the specific charateristics of MES implementation project found in an Indonesian steel manufacturing company implementation case. The case study highlighted the importance of performing a pilot deployment before putting the whole system into operation. This study also found that before entering the implementation stage, it is necessary for manufacturing companies to make sure that stakeholder readiness and facility readiness are assessed. For this, preliminary assessments need to be done before the implementation, to make sure that the facilities (including SFA/shop floor automation systems and ERP systems) are ready to be integrated with MES. Besides, it is important that shop floor personnels, management personnels and other involved stakeholders are ready to be involved in the implementation process.Intermittent gas lift is commonly known as one of artificial lift technique that is implemented into wells with low bottom-hole pressure. The injection process will be in cycle and periodically. Previously, intermittent gas lift is modeled using nodal analysis method (intersection between inflow performance relationship (IPR) and tubing performance relationship (TPR)) and mechanistic method. Both solutions required a hard-working numerical approach to solve the model. In this paper, a new-simple-effective analytical approach is introduced to solve a set of equations that was derived from Transport Reynolds Theorem. The work is slightly different from the Liao and Bordalo model. A complex equation that was represents movement of the gas-column, the slug, and the film from surface to sub-surface are presented. Column gas is formed during the injection time and the injected gas will push the oil to the surface. The dynamic of the gas column greatly affect the success of the process of oil production with gas injection method intermittently. The gas-column pressure, surface injection pressure and rate, gas column density, and surface gas injection density are successfully obtained using this approach. The gas-column pressure in the tubing is strongly influenced by the surface gas injection rate. By controlling the surface gas injection rate then the column-gas pressure in the tubing will be stable. The stable gas-column pressure leads to the stable oil production. This research is genuinely believed to be the first analytic approach of determining intermittent gas lift parameters which can to maximize oil production. The results are helpful and applicable either for the educational as well as industrial purposes.72
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