Feasibility study of flared gas utilization for unconventional oilfield in thailand

Abstract

In this thesis, an onshore marginal oilfield is studied. The field currently produces oil approximately 8,500 barrels per day as well as natural gas around 1,300,000 scfd (standard cubic feet per day) which is disposed by flaring. The challenging of this field is that there are twenty nine oil wells producing oil from twenty one well site locations while each well has its own processing equipment’s and does not connect to each other. Furthermore, this field is an unconventional oilfield which produced from volcanic rock reservoir. The production life of each well is shorter than conventional oilfield production that normally produced from sandstone reservoir. These reasons are taken into account for considering gas utilization options. The production forecast in this thesis has been performed by Decline Curve Analysis (DCA) method the result showed small gas production forecast and very short production life, which is only 1-2 years in average. These data has been used for feasibility study for gas utilization in 4 possible well known options namely power generation, Compressed Natural Gas (CNG), Liquefied Natural Gas (LNG), and on-site gas utilization. These options are studied in detail on technical and economic feasibility study. According to the studied result, only on-site gas utilization is technical and economic feasible. The rest options are infeasible because the limitation of economic reason and short production life.