#TITLE_ALTERNATIVE#

• Main Author: SIAMANDA (NIM : 12214101), AULIA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/25931
• Institution: Institut Teknologi Bandung

X Field is operated by VICO Indonesia in the Sanga-Sanga Production Sharing Contract. It is located in the <br /> <br /> Mahakam Delta. It has been producing oil and primarily gas since 1977. Due to its complex fluvial deltaic <br /> <br /> deposition, X Field has over 500 reservoirs. This big number of reservoirs promotes the implementation of <br /> <br /> monobore/dual-bore completion in the recent years. X Field currently has hundreds of wells both with <br /> <br /> conventional completion and monobore/dual-bore completion. Since X Field is a major gas producer, the most <br /> <br /> widely used artificial lift method is gas lift. Permanent Coiled Tubing Gas Lift (PCTGL), which is a <br /> <br /> breakthrough in VICO Indonesia since 2010, where the gas is injected through the coiled tubing and the oil is <br /> <br /> produced through the annulus between the tubing and the coiled tubing, has been applied in monobore/dualbore <br /> <br /> completed wells because this type of completion cannot accommodate the gas lift mandrels. Conventional <br /> <br /> Gas Lift (CGL) that uses gas lift mandrels and unloader valves has also been applied to older wells with <br /> <br /> conventional completion. Both of these gas lift methods have their own advantages and disadvantages such as: <br /> <br /> CGL installation is more expensive than PCTGL, PCTGL is limited to a certain depth of injection whereas CGL <br /> <br /> is not, and the flow area in the tubing in PCTGL installed well is smaller than CGL. A thorough evaluation of <br /> <br /> oil well performance using PCTGL and CGL has not been conducted in X Field. This evaluation is required to <br /> <br /> provide suggestion for VICO Indonesia and the next operator as to which method will give higher recovery. <br /> <br /> This study shows that the best gas lift method to apply in monobore/dual-bore wells is PCTGL with coiled <br /> <br /> tubing diameter of 1.5” and in conventional completed wells is CGL.