Determination of Scaling Zone and Scaling Type in Slotted Liner Based on the Fluid Flow Pattern in the Geothermal Well “X”

Abstract

A geothermal well can experience a decrease in the production of fluid (steam) due to the presence of scaling. The scaling usually is formed in the slotted liner hole. The purposes of this study were to determine the fluid flow pattern, the zone of scaling accumulation, and the scaling type in the well "X". This can be a reference to determine the next step to prevent and clean scaling problems in the wellbore. In determining the fluid flow pattern, the manual calculation using the Hewitt-Robert method and the simulation calculation using WellSim software were conducted. In determining the zone of scaling accumulation, the pressure, temperature, and spinner (PTS) survey data were utilized. In determining the scaling type, the geochemical analysis data were utilized. The results showed that the fluid flow pattern was annular flow based on the Hewitt-Robert method and mist flow based on WellSim software. There is no flow pattern type of mist in the grouping of flow patterns based on Hewitt-Robert. Because the characteristics of mist flow and annular flow are almost the same, the annular flow pattern can be considered similar to mist flow. Furthermore, the results were validated with PTS survey data so that the flashing zone was known at a depth of 1458.27 m from a total depth of 1700 m. Based on the geochemical analysis, it was known that the scaling type in the well "X" is of the calcite type.

Analysis of the Z Well Production Test Using the Horizontal Lip Pressure Method at Pt. Pertamina Geothermal Energy Ulubelu Area

“…The ambient temperature is around 23-26°C with rainfall between 1500-2300 mm per year. The geographical boundaries are X =104°C 27'25", 104°C 43'31" East; Y = 05°C 31'29" South, with a maximum temperature of 104°C [1]. The process is carried out in several stages, namely:…”