高温高压人工井壁循环系统的研制

The Development of the HTHP Circulating System in Manmade Borehole

由于常规评价井壁稳定性的试验方法不能有效模拟现场动态条件下的井壁变化情况,根据水力学、渗流力学以及声波测井原理研制了高温高压人工井壁循环系统。该系统将压制的人工井壁放置于井筒中,然后在模拟现场高温高压及流速的条件下用测试钻井液在人工井壁内进行循环,再通过声波测量-信号采集的方法实时观测井径的变化情况。介绍了该系统的结构、工作原理及技术关键,并进行了不同流体对井壁稳定性的影响试验。试验结果表明,该系统重复性好,性能稳定,结构简单,操作方便,且采用超声波测井手段,为综合评价钻井液、完井液对井眼扩径、缩径以及垮塌程度的影响提供了新的综合测试手段。

Conventional experimental methods to evaluate wellbore stability cannot effectively simulate the dynamic condition of wellbore in the field. The HTHP manmade wellbore circulating system was developed based on the theories of hydraulics, dynamics of fluids porous media and sonic well logging. The manmade wellbore was put in the well, then the examined drilling fluids according to the HTHP and rate in field are circulated in the manmade wellbore and the sonic logging was used for data acquisition to observe the wellbore diameter real-time change. This paper introduces the structure of this system, principles of work and key techniques. The impacts of different fluids on the wellbore stability were examined. The experimental results indicate that this system has very good repeatability stable performance, simple structure, easy operation and uses sonic logging for data acquisition which can be used to evaluate drilling fluids and the impacts of drilling fluids on the wellbore swelling, hole enlargement, hole shrinkage and hole collapse.