针对目前油气田现场广泛采用的多相流分离检测技术存在的效率低、精度差、数据延迟等问题,研究基于磁共振技术的多相流在线检测方法,形成硬件装置,并开展室内实验及现场应用。提出“静止状态测相含率+流动状态测流速”的多相流磁共振流量测量方法;提出采用先计量油水比再计量含气率的方法实现油、气、水三相相含率的测量。在装置研制方面,提出可应用于流动流体测量的分段式磁体结构和双天线结构,研发了高集成磁共振谱仪系统及配套智能化软件。室内实验及现场应用表明,研制的多相流磁共振在线检测系统存在以下优势：只依靠磁共振技术同时完成流量和相含率检测;在线原位高频率检测,实时监测油井瞬态产液波动;能实现油、气、水三相全量程高精度检测,且不受矿化度、乳化状态影响;绿色、安全、低能耗。图16表4参34
邓峰
,
熊春明
,
陈诗雯
,
陈冠宏
,
王梦颖
,
刘化冰
,
张建军
,
雷群
,
曹刚
,
徐东平
,
陶冶
,
肖立志
. 油气多相流磁共振在线检测方法及装置[J]. 石油勘探与开发, 2020
, 47(4)
: 798
-808
.
DOI: 10.11698/PED.2020.04.17
Most multiphase flow separation detection methods used commonly in oilfields are low in efficiency and accuracy, and have data delay. An online multiphase flow detection method is proposed based on magnetic resonance technology, and its supporting device has been made and tested in lab and field. The detection technology works in two parts: measure phase holdup in static state and measure flow rate in flowing state. Oil-water ratio is first measured and then gas holdup. The device is composed of a segmented magnet structure and a dual antenna structure for measuring flowing fluid. A highly compact magnetic resonance spectrometer system and intelligent software are developed. Lab experiments and field application show that the online detection system has the following merits: it can measure flow rate and phase holdup only based on magnetic resonance technology; it can detect in-place transient fluid production at high frequency and thus monitor transient fluid production in real time; it can detect oil, gas and water in a full range at high precision, the detection isn’t affected by salinity and emulsification. It is a green, safe and energy-saving system.
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