SCALE TENDENCY ANALYSIS ON WELL B-1 GBK FIELD WITH METHODS STIFF DAVIS AND SKILLMAN^S, MCDONALD & STIFF CALCULATIONS Jacob Johan
Oil and Gas Production Engineering Polytechnic of Energy and Mineral Akamigas, Jl. Gajah mada NO. 38, Cepu, Blora, Central Java, 58315, Indonesia
Abstract
In the surface production facilities area, problems that disrupt the distribution of crude oil are often encountered, typically caused by the formation of deposits (scale) along the distribution pipes (flowline). This scale is a solid formed by the crystallization and deposition of minerals from connate water (formation water) that is produced alongside oil and gas. The formation of scale can be predicted based on the ion content in connate water that forms components with limited solubility, or it can occur due to changes in connate water conditions such as pressure drop, temperature changes, or mixing of two types of water with incompatible mineral compositions. When scale forms in the pipes, it causes diameter narrowing and hinders fluid flow in the pipe system. This disturbance can increase temperature and pressure in the system, escalating the risk of pipe rupture and damage.This research utilizes scale samples from inside the crude oil distribution pipes (flowline) at the GBK well field owned by BASS OIL SUKANANTI LTD. The scale issues occurring in well B-1 are caused by pressure drops, temperature changes, and pH changes in formation water. This results in sudden changes in the composition of produced connate water, such as temperature, pressure, and formation water content, leading to the formation of carbonate and sulphate scales. The methods used to analyze scale growth are the Stiff Davis method to determine carbonate scale saturation index and the Skillman, McDonald, Stiff method to determine sulphate scale saturation index. This research is expected to make a significant contribution to addressing and optimizing scale problems and their prevention in the oil and gas industry using appropriate scale inhibitors.
Keywords: Crude Oil, Flowline, Saturation, Scale
Topic: Engineering of Drilling, Production, and production surface and facility
