CO_2驱注入剖面测井方法及应用

CO_2 Injection Profile Logging Method and Its Application

基于现有注入剖面测井技术,结合CO2驱井特点,改进测井工艺、优化技术选择、建立解释方法。利用研究形成的CO2驱注入剖面测井方法,即五参数吸气剖面测井技术和脉冲中子氧活化测井技术,现场测井应用38井次,从所测资料统计分析,五参数吸气剖面测井技术井温曲线指示明显,结合温度拐点的情况,可定性分析吸气层;脉冲中子氧活化测井技术可以定量给出各层的吸入量,但低流量时成峰较为发散,其峰位特征不完全符合正态分布,由于受仪器源距的限制有轻微拖尾现象,氧活化测井仪的测量下限为10m3/d。

We carry out oil displacement experiments in three blocks of Daqing oilfield to explore the effective development technology for Fuyang reservoir with low permeability and fracture underdevelopment. Based on the present injection profile logging technology and combined with the characteristics of the CO2 flooding, we improve logging techniques, optimize log technologies and establish better log interpretation methods. The CO2 injection profile logging methods, which are five-parameter injection profile logging technology and pulse neutron oxygen activation logging technology, are applied in 38 wells. Log datum statistical analyse shows that temperature curve of five-parameter injection profile logging technology is obvious and can qualitatively indicate injection layers combining with temperature inflection points. Pulse neutron oxygen activation logging technology can quantitatively calculate injection sizes of every layer, but the peak more disperses in low flow, the characteristics of peak location are not fully in line with normal distribution. Peak has slight trailing due to instrument spacing restriction. Minimum measure value of oxygen activation logging tool is 10 m3/d.