标题:
连续管钻井循环压耗的计算The Calculation of Circulating Pressure Loss in Coiled-tubing Drilling
作者:
米远祝, 罗跃, 黄志明
关键字:
连续管钻井, 水基钻井液, 循环压耗, 流变性能参数Coiled-tubing Drilling, Water-based Drilling Fluid, Circulating Pressure Loss, Rheological Property Parameter
期刊名称:
《Journal of Oil and Gas Technology》, Vol.39 No.6, 2017-12-15
摘要:
以辽河油田某区块作为研究对象，以该区块的地质情况、连续管钻机的性能参数等作为计算依据，对连续管钻井中各段压耗包括连续管盘管压耗、连续管直管压耗、环空压耗以及总循环压耗进行了相应的计算，重点探讨了钻井液流量Q，稠度系数K以及流性指数n对连续管循环压耗的影响。根据计算结果，结合实践经验，初步确定了连续管钻井液的流变性能参数。理论计算结果表明，对于水基无固相钻井液而言，Q值选择在0.01 m3/s左右, n值选择在0.4~0.5，K值选择在0.7~1.0 Pa∙sn较为合适。这些计算的理论分析可为连续管钻井液的设计提供一定的理论依据。
A block of Liaohe Oilfield was taken as research object, based on geological condition of the block and performance parameter of coiled-tubing drilling rig, the pressure loss of different sections was calculated in coiled-tubing drilling(CT) including pressure loss of CT twisting in reel, downhole CT, annulus and total circulating. Especially, the effect of some important factors on total circulating pressure loss was discussed such as flow rate Q, consistency index K and rheological index n. Rheological properties parameter for coiled drilling fluid was determined by combining calculation results and practical experience. The calculation results show that it was desirable that Q is selected at 0.01 m3/s, n is at 0.4-0.5 and K is at 0.7-1.0 Pa∙sn in the water-based solid-free drilling fluid. Certain theoretical basis is provided for the design of fluids used in coiled-tubing drilling.