油井含砂在线监测技术研究

井口含砂在线监测是国外近年来发展起来的一种高精度实时监测油井出砂研究手段。在引进SandQTM 含砂监测系统基础上对其配套技术进行了优化，首先，利用FEPG 系统开发了三维声波传导有限元程序，对井口声波测试弯管壁厚进行了优化，建议壁厚为510 mm；其次，建立了近井渗流稳定时间分析有限元模型，优化井口测试程序，结果表明，对于高渗疏松砂岩油藏，生产制度调整后24 h 以内近井渗流即可达到稳定，结合现场实际，将油井工作制度调整频率设计为1 次/d；最后，进行了现场试验，研究表明，该技术对于抽油机及电潜泵井采油树均具有较好适应性，对于产出液黏度较小的油井适应性强、测试精度高，对于产出液黏度较大（动力黏度>1 824 mPa
s）油井，适应性较差。

Research on Real-time Sanding Monitoring System for Oil Well

In recent years,wellhead real-time sanding monitoring developed abroad is a real-time monitoring tool for oil well sand production with high precision. Based on SandQTM sanding monitoring system and optimizations of its matching technology,a 3D sound wave conduction finite element program is developed with the help of FEPG system,and then wall thickness of bent pipe is simulated and optimized in sonic testing which suggests that the thickness of pipe should be between 5 mm to 10 mm. Then a finite element model for analyzing the time when near wellbore percolation reach to stabilization is developed. Wellhead testing program is also optimized. The research shows that,in the case of loose sandstone reservoir with high permeability,the percolation near wellbore could reach to stabilization in 24 hours after the adjustment of oil well production system. According to the well site practices,the frequency of production system adjustment for oil well should be 1 time per 24 hours. The system has been tested,and the result shows that it has a great applicability for oil wells with electric submersible pump Christmas tree and regular pumping unit. It also has a high applicability and high testing accuracy for oil wells with low-viscosity product,but it has a low applicability for oil wells with high-viscosity product whose dynamic viscosity is more than 1 824 mPas.