石油钻采工艺2018，Vol.40Issue(1)：9-13,5.DOI:10.13639/j.odpt.2018.01.002
水平井钻井过程中井底钻压预测及应用
Bottom hole WOB prediction in the process of horizontal well drilling and its application
摘要
Abstract
The performance of drilling bits is mainly evaluated by means of the rate of penetration (ROP) and the bottom hole WOB (weight on bit) is the main parameter influencing ROP. And especially for horizontal wells, it is quite important to calculate and measure the actual bottom hole WOB because the friction drag of horizontal section is high and it is not easy to apply the load on the bit, which leads to larger difference between bottom hole WOB and ground WOB. The torque and drag model was established by combining Johancsik model Aadnoy 3D model together. The stiffness of pipe string is taken into account. The calculation of bottom hole WOB was divided into two steps. After the friction coefficient between drilling string and borehole wall was calculated by using the idling data of drilling bit, the bottom hole WOB in the process of well drilling was predicted based on the calculated friction coefficient. Meanwhile, the calculation program for bottom hole WOB was developed by means of C# in the integrated development setting of Visual C++ 2013. And then this newly developed program was used to calculate friction coefficient and bottom hole WOB. It is shown that the calculated bottom hole WOB is consistent with the measured one in terms of numerical value and variation trend. It is indicated that the WOB calculation model and program can predict the bottom hole WOB accurately based on ground drilling data. Bottom hole WOB calcula-tion model and program are applicable to post drilling analysis and can control the bottom hole WOB accurately by integrating with the conventional automatic driller, so as to improve bit performance and drilling efficiency and cut down drilling cost.关键词
水平井钻井/钻压预测/摩阻/钻头/计算模型/摩擦因数Key words
horizontal well drilling/bit weigh prediction/friction drag/drilling bit/calculation model/friction coefficient分类
能源科技引用本文复制引用
吴泽兵,郭龙龙,潘玉杰..水平井钻井过程中井底钻压预测及应用[J].石油钻采工艺,2018,40(1):9-13,5.基金项目
陕西省"百人计划"创新全职项目"先进井下工具设计与性能仿真及在钻井自动化中的应用"(编号:290088247). （编号:290088247）
