In this document, well testing is a well production testing job to find out production data from each well (oil, water and gas) per day. This data is important for Petroleum Engineers to analyze well and formation as a whole, whether the well is still producing good or requires a well service or workover job to maintain / increase the rate of production.
Well testing is carried out with 2 (two) methods, namely:
1) Manual Well Testing (MWT)
2) Automatic Well Testing (AWT)
Manual Well Testing (MWT)
This method is carried out by Operators using equipment mechanically. Well testing is done by flowing well production into a test separator / test tank for a certain period, then the Operator returns the flow of the well to the production pipeline after a certain time and measures the liquid in the tank (test tank) or reads the indicator level gauge as a result of testing. Based on the difference in level between ―”On” and ―”Off” test, it is obtained that the production of wells during the time span is determined by multiplying the results of the difference in liquid level by the factor of the tank size. In a test separator / test tank that equipped with a flow component and a water cut monitor (micro computer), the measurement of the volume of fluid produced during testing can be read at the flow meter (vortex meter, turbine or PD meter), and the water content can be read at the water cut meter (Agar / MFI).
Manual Well Testing Components:
- Test header
- Test line
- Test tank
- Test separator
Test Header – is an arrangement of several jumper lines and valves that are connected to each test line and production line. The function of the test header is to direct the flow of fluid from the well to the test facility or back to the production line.
Picture 2- Test Header (Courtesy of Kementerian P&K RI)
Test Line – is a pipe (flow line) whose function is to channel fluid from the well to well testing facilities. The size of this test line varies according to needs: well distance with well testing facility and large production from wells. Examples: 3 “, 4”, 6 “and 8”.
Picture3 – Test Line (Courtesy of Kementerian P&K RI)
Test Tank – is a storage vessel that has a certain size, volume, factor and capacity and is installed in the well testing facilities, to accommodate and measure fluid media during the well testing process.
Picture 4- Test Tank (Courtesy of Kementerian P&K RI)
Test Separator – is a two-phase separator to separate the gas from the fluid produced by the well during well testing, because if the gas passes through the meter it can cause high reading. The test separator has a maximum / minimum pressure, temperature and certain capacity.
Picture 5- Test Separator (Courtesy of Kementerian P&K RI)
Reference :
- Oil Well Testing Handbook
- Buku PK. TEKNIK PRODUKSI MIGAS Semester 3, terbitan Kementerian Pendidikan dan Kebudayaan Republik Indonesia, th 2013
- Buku PK. PROSES PRODUKSI MIGAS Semester 4, terbitan Kementerian Pendidikan dan Kebudayaan Republik Indonesia, th 2013
- Buku PK. TEKNIK RESERVOIR DAN CADANGAN Semester 3, terbitan Kementerian Pendidikan dan Kebudayaan Republik Indonesia, th 2013