BANDUNG, speitbsc.org – On Wednesday (30/08/17), SPE ITB SC held a fieldtrip to Pertamina EP (PEP) Asset 3 Subang Field. Before going to the field, the participants were welcomed in Wisma Bukit Indah, Purwakarta Regency. The 24 participants were given safety briefing and overview about the company. The speakers were Mr. Wahyu Podi as HR Assisstant Manager, Mr. Laksmana as Q HSSE Manager, and Mr. Taufik Pansuri as Petroleum Engineer.
The milestone of Subang Field was started from exploration phase in 1973 to 1995, continued to Production phase in 1995-2007 and development phase from 2007 until now. In development phase, three new structures were found: Jati Sinta, Jari Rimba, and Jati Asri. Now, they produce 1300 BOPD of oil and 2015 MMSCFD of gas. In running the field, Mr. Laksmana said, most of the problems, around 70% comes from social problems and the rest is technical problems. The problems include the location of the field which is near people residents and also the relationship between workers are complicated.
Pertamina EP Asset 3 Subang Field has 5 districts, which are Pagaden, Cilamaya, Subang, Cicauh-Sukamandi, and the newest is L-Parigi. Those districts are located in 3 respective regencies: Karawang, Subang, and Purwakarta. The reservoir type of this field is small, separated and also scattered, they are called structures. This has been the real challenge for developing the field, because each of the reservoir has its own characteristics. They are all located in north basin of West Java and there are four considered productive formations: Parigi produces gas, Cibulakan Atas produces gas, condensate, and oil, Baturaja produces condensate and gas, and last but not least Talang Akar which produces oil. Considering almost every layer in the field are using solution-gas drive, the weakest driving mechanism in petroleum system, this field using two kind of artificial lift methods: Electrical Submersible Pump (ESP) and High Pressure Unit (HPU). It has respectively 5 and 1 well.
Pertamina EP Asset 3 Subang Field has 10 gathering station, 2 units CO2 removal, and also 3 test unit. There are 127 wells with 58 production wells, 7 injection wells, and 62 non-productive wells. The non-productive wells are caused by the product from the well is 100% water and the pressure has declined significantly. The majority product of this field is gas with 20-40% CO2 contents. That’s why the CO2 removal plant is needed to be effectively run. CO2 removal plant in Cimalaya can reduce the CO2 content from 40 to only 5%. And CO2 removal plant in Subang can reduce CO2 content from 23 to also 5%. It must be 5% because in almost all Perjanjian Jual Beli Gas (PJBG), the CO2 must be less than 10%. The CO2 removal plant is using AMDEA, a chemical compound to bind the CO2. And the product of CO2 is sold to the consumers which are PT SAMATOR GAS and PT Aneka Gas Industri. It is well known that this field is friendly in processing gas by several awards that they got.
The session in the office is ended by memento session and the participants directly headed to Cicauh Field, 30 km from the office. As the main key to safety, the participants are given briefing and must remember HSSE golden rules: Patuh, Intervensi, Peduli (Obey, Intervene, Care). We were brought to the production facilities of Cicauh. The first one was Header Manifold, it is directing the fluid from several different wells every day. It is operated by a production operator. The fluid is directed to separator and scrubber so the fluid and condensate can be separated. After that, the fluid goes to the storage tank. To make sure that the gas is pure, it is flowed to dehydration plant. It is a chemical-separation method using TEG (Tri Ethylene Glycol). After all the steps are done, the gas is brought to PertaGas using a vacuum truck. In this field, they produce 5 MMSFCD gas.
After 2 hours exploring the field and getting a lot of new knowledge, the participants went back to Bandung.