小井眼钻井水力参数优化设计模型的建立及软件开发

发布时间：2018-05-20 19:20

本文选题：小井眼 + 环空压耗　；参考：《西安石油大学》2015年硕士论文

【摘要】：由于小井眼井环空间隙小以及钻柱高速旋转的特点,小井眼钻井与常规井眼钻井在水力学上有很大的区别,其中重要的一点就是小井眼环空压耗明显大于常规井。钻柱旋转、钻柱偏心等对环空压耗有影响的因素在小井眼环空压耗计算中不能再忽略,常规的水力参数优化设计方法也已不能完全适用于小井眼。另外现有的小井眼环空压耗计算模型考虑的影响因素不够全面且预测精度不高,因此急需建立一个精确的小井眼环空压耗计算模型及适用于小井眼井的水力参数优化设计模型。本文在系统调研国内外小井眼钻井水力学资料的基础上,对小井眼与常规井水力学差异进行了研究;在常规井环空压耗计算基础上,推导出了一种新的适用于宾汉、幂律、赫巴等多种流变模式,考虑了钻柱旋转、钻柱偏心、钻具接头、井壁粗糙度等因素综合影响的小井眼环空压耗计算模型;分析了不同钻井液流变模式及各影响因素对环空压耗的影响,通过现场实测数据的验证表明文中建立的小井眼环空压耗计算模型具有很高的计算精度;针对小井眼井环空压耗对钻井液流变模式选择的敏感性,建立了一种新的流变参数计算方法和流变模式优选方法;最终完善了小井眼钻井水力参数优化设计理论,通过对钻井液流变模式、循环系统压耗的计算,喷嘴当量直径计算等方面的优化,建立了小井眼钻井水力参数优化设计模型并开发了小井眼钻井水力参数优化设计软件。
[Abstract]:Due to the characteristics of small annulus gap and high speed rotation of drill string, there is a great difference between slim-hole drilling and conventional borehole drilling in hydraulics. The important point is that the annulus pressure consumption of slim-hole is obviously higher than that of conventional borehole. The factors affecting annulus pressure loss such as string rotation and eccentricity can not be ignored in the calculation of annulus pressure loss of small borehole, and the conventional optimization design method of hydraulic parameters can not be completely applied to small hole. In addition, the existing calculation model of borehole annulus pressure loss is not comprehensive enough and the prediction accuracy is not high, so it is urgent to establish an accurate calculation model of slim-hole annulus pressure loss and a model of hydraulic parameter optimization design suitable for small borehole. On the basis of systematically investigating the hydraulic data of small hole drilling at home and abroad, this paper studies the difference of hydraulic mechanics between small well and conventional well, and deduces a new kind of power law suitable for Bingham, power law on the basis of calculation of annulus pressure consumption of conventional well. Several rheological models, such as Herba, are used to calculate the annular pressure loss of small hole considering the factors of string rotation, drill string eccentricity, drill joint and wall roughness. The effects of different rheological modes of drilling fluid and various influencing factors on annular pressure loss are analyzed. The verification of field measured data shows that the calculation model of annular air pressure loss of small hole established in this paper has a high calculation accuracy. In view of the sensitivity of annulus pressure consumption to the selection of rheological model of drilling fluid, a new method for calculating rheological parameters and optimal selection of rheological model is established, and the theory of optimal design of hydraulic parameters in slim hole drilling is finally improved. By optimizing the rheological model of drilling fluid, the calculation of pressure consumption of circulation system and the calculation of equivalent diameter of nozzle, the optimal design model of hydraulic parameters for slim hole drilling is established and the software for optimal design of hydraulic parameters of slim hole drilling is developed.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE246

【参考文献】