Study and Application of Reaming While Drilling in Deep Directional Wells
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摘要: 深井小井眼斜井段钻后扩孔存在扭矩大、工具易折断、周期长、扩孔效果差等技术难题,为此,开展了定向随钻扩孔研究与试验。在分析国内外主要扩孔工具的特点和现场应用效果的基础上,优选CSDR型双心钻头作为扩孔工具,配套475K4570型可调式单弯螺杆钻具为其提供动力。根据水功率合理分配原则,优化了钻头喷嘴组合和水力参数,在THA井进行了现场试验。THA井一趟钻钻进153 m,成功实现了井斜14.13°~42.50°段内的定向随钻扩孔,作业段井眼轨迹平滑,平均全角变化率5.554°/30m,平均井径173.99 mm,作业周期较设计周期缩短50%。现场试验表明,双心钻头配合螺杆动力钻具可以实现深井小井眼大斜度段的定向随钻扩孔作业,扩孔效果好,作业周期短,是进行斜井段扩孔作业的有效技术手段。Abstract: In order to address technical difficulties in reaming after drilling in directional wells,such as high torque,ease in breakage of reaming tools,long reaming time and poor reaming result,study and test of reaming while directional drilling were carried out.Through analysis of features of reaming tools at home and abroad as well as field application,CSDR bi-center bit was selected as the reaming tool,matched with 475K4570 adjustable mud motor providing force.The nozzle combination and hydraulic parameters were optimized according to the principle of rational distribution of hydraulic power.In the Well THA,successful reaming while directional drilling was realized in China for the first time,at the curve section from an inclination of 14.13°to 42.50°,the reaming section is smooth,with an average rate of over-all angle change of 5.554°/30m and an average hole size as 173.99 mm,saving 50% of the reaming time.Field test shows bi-center bit,matched with PDM,can realize reaming while directional drilling in deep slim hole.Good reaming effect and short reaming time have made it become an effective means of reaming in directional well section.
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Keywords:
- deep well /
- sidetracking /
- directional well /
- reaming while drilling /
- bi-center bit
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