Mahakam油田多层无管井成功断水策略:JM-X案例研究

K. Umar, Risal Rahman, R. Hidayat, P. S. Kurniawati, R. Marindha, G. D. Dahnil, Gerardus Putra Pancawisna, Danny Hidayat, A. Az-Zariat, F. Utama
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摘要

本文的目的是提出多层油藏无管井的机械关水(MWSO)策略。由于有10个开放的射孔油藏,并且没有选择性选择,因此产水油藏的隔离将是主要挑战,因为生产在井的整个生命周期内都是混合的。通过多相流量计设备在每个海上平台上进行的定期生产测试是监测井中产水变化的第一个指标。JM-X井在初次射孔一周后就出现了破水现象,随着产气量的下降,WGR持续上升。该策略是通过进行井底监测调查来确定水源的。生产测井工具(PLT)用于精确监测沿井筒的压力、温度、持水量和流体速率,以进一步分析水源和生产分配。一旦确定了水源水库,就要求进行MWSO作业。在Offshore Mahakam油田中,有几种常用的MWSO设备,每种设备都有根据预期井储量的选择性经济考虑。考虑到运行难度和成本,制定了MWSO方案,并在运行期间进行监控,确保运行安全平稳。JM-X井的MWSO策略已被证明能够将产水量从900桶/天减少到仅20桶/天,天然气产量从300万立方英尺/天显著增加到920万立方英尺/天,石油产量从200桶/天增加到750桶/天。
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Successful Water Shut Off Strategy for Multilayer Tubingless Wells at Mahakam Field: JM-X Case Study
The objective of this paper is to present the Mechanical Water Shut-Off (MWSO) strategy for multilayer reservoirs on tubingless well. With 10 open perforated reservoirs and no selectivity option, isolation on water producing reservoir will be the main challenge since production is commingled throughout the lifetime of well. Regular production tests performed through a Multiphase Flowmeter equipment on each offshore platform is a first indicator to monitor the evolution of water production in a well. JM-X well has been experiencing water breakthrough since one week after initial perforation and WGR keep increasing following gas production decline. The strategy was initiated by conducting a bottom hole monitoring survey to identify water sources. Production Logging Tool (PLT) was used to precisely monitor pressure, temperature, water holdup, and fluid rate along the wellbore for further water source and production allocation analysis. Once the water source reservoirs have been identified, MWSO operation was requested. There are several types of MWSO equipment that are commonly used in Offshore Mahakam field each of which has selective economic consideration based on the expected well reserve. Considering operation difficulties and cost, MWSO program was made then will be monitored during the operation time to ensure the operation runs safely and smoothly. MWSO strategy on well JM-X was proven to be able to reduce water production from 900 bpd to only 20 bpd with a significant gain of gas production from 3 MMscfd to 9.2 MMscfd and oil production from 200 bpd to 750 bpd.
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