二氧化碳注入井脉冲中子氧活化解释方法研究

The Method of interpretation for Mass CO2 Flow to Co2 injection Well

对于二氧化碳注入井,常规的剖面测试技术中仅有脉冲中子氧活化测试技术能够满足现场需求。但脉冲中子氧活化只能测的流体的体积流量,由于二氧化碳流体的特殊性,要把氧活化测得的体积流量转换成质量才能够真实反应地层的吸入情况。利用P-R状态方程法来对二氧化碳气体的偏差因子进行求解,进而求取二氧化碳流体的密度,实现体积流量到质量流量的转换,进而得到二氧化碳流体在井筒中密度曲线,达到充分利用脉冲中子氧活化仪器测得的参数,提高测井解释的精度。

Only the pulse neutron oxygen activation logging technology to achieve carbon dioxide injection profile of injection well testing, But the pulse neutron oxygen activation can only measure the volume of fluid flow, due to the particularity of co2 fluid, to measure the oxygen activation of the conversion from volume flow to mass suction can reflect formation. Using P-R state equation method to solve of CO2gas deviation factor, and then calculate the carbon dioxide fluid density, volume flow to mass flow transformation, co2 fluid in the wellbore medium density curve is obtained, to make full use of the pulse neutron oxygen activation instrument measured parameters, to improve the accuracy of logging interpretation.