井底漫流场数值模拟研究

理论研究、台架实验和现场经验表明:井底流场的特性与钻井效率、钻井安全、钻头寿命等有着密切的关系。而喷嘴几何形状、喷嘴布置方式是决定井底漫流场是否合理的关键因素。为了发展有预见性的定量化井底流场研究技术,应用势流理论对井底漫流场进行了数值模拟。模拟结果与台架实验对比表明,井底漫流场数值,模拟能比较客观的反映不同喷嘴组合、不同侧倾角、不同后倾角条件下几股射流的相互作用情况,可为评价井底流场的优劣、钻井效率的高低提供一定的理论依据。

NUMERICAL SIMULATION RESEARCH ON BOTTOM-HOLE CROSSFLOW FIELD

According to a lot of theoretical studies, laboratory experi-ments and oilfield experience, It was proved that the bottom-hole flow field seriously affected the drilling efficiency, down-hole safety and bit operation life. The geometry shapes and ar-rangements of the nozzle are the key factors to determine thatthe bottom-hole flow field is reasonable or not. In order to de-velop the predictable and quantitative research technology, the potential flow theory was used to simulate the bottom-hole crossflow field. Compared the results of the simulation to the experiment in the laboratory, it was shown that the result of the numerical simulation about bottom-hole crossflow field candescribe the cases of several jet interactions under the conditionof the deferent nozzle combinations, different lateral inclina-tions, different rear inclinations. It can provide a certain theory supports for the evaluation of the bottom-hole flow field and drilling efficiency.