Abstract
Gas Compression Package (GCP) is a vital system in the distribution of gas. Pertamina EP, in this regard as a state-owned company managing oil and gas on the upstream, is in the project phase of purchasing and installing compressor facilities. GCPs are used to increase gas pressure hence it can be transferred from gas wells to industrial areas. Dynamic analysis becomes important to observe the performance of the compressor and to ensure safety during operation, in order to avoid surge phenomenon. Surge is an undesirable phenomenon in the form of a backward flow of gas. The surge may damage the internal components of a centrifugal compressor, hence needs to be prevented from happening. The anti-surge controller manipulates anti-surge valve to give actions in the recycle lines when a surge occurred. PID controller is used for controlling and stabilizing the system. PID tuning is determined using Auto Tuning Variation method. This method is based on the process frequency response from relay oscillations. After the dynamic model of the plant had been developed, some simulations were carried out with various scenarios. The scenarios were based on a variety of issues that may occur in a gas compression system. The applied scenarios were a decrease in flow rate on the input side, a pressure drop in gas wells, and changes in gas composition. The control configuration of gas compression system was designed and modified in order to compensate disturbances and avoid surge phenomenon.
Highlights
Natural gas is one of the natural resources that have a broad range of utilization such as for cooking, for generating electricity in power plants, and as raw material for processing of fertilizer
Each train consists of unit operations such as medium pressure (MP) scrubber, centrifugal compressor, air cooler, high pressure (HP) scrubber, level control valve (LCV), and anti-surge valve (ASV)
The step is tuning with Auto Tuning Variation (ATV) method, while for Anti-Surge Controller (ASC) tuning done by trial and error with certain procedures
Summary
Natural gas is one of the natural resources that have a broad range of utilization such as for cooking, for generating electricity in power plants, and as raw material for processing of fertilizer. South Sumatra, a province in Indonesia, has very abundant natural resources, including natural gas. According to the government of South Sumatra Province, natural gas reserves are found in Musi Banyuasin, Lahat, Musi Rawas, and Ogan Ogan Ilir, which reach 7238 Billion Standard Cubic Feet per Day (BSCFD). Pertamina EP produced approximately 120,000 Barrels of oil Oil per Day (BOPD) and around 1,003 MMSCFD of natural gas [2]. Pertamina EP plans to increase its production capacity of 100 MMSCFD to 150 MMSFD by building a new compressor facility in Assets 2 Field Pendopo. This project is divided into 3 main section, i.e., gas separator system, gas compression system, and fuel gas-seal gas system. Each train consists of unit operations such as medium pressure (MP) scrubber, centrifugal compressor, air cooler, high pressure (HP) scrubber, level control valve (LCV), and anti-surge valve (ASV)
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