摘要
连续管应用越来越广泛,但是由于连续管管径小、流阻大等特点,系统性地研究连续管钻井系统摩阻压降已迫在眉睫。基于理论研究,筛选相关计算模型,得到了符合连续管钻井实际的摩阻计算模型;筛选了4种数值模拟计算模型,并进行多盘管规格和多流量的数值模拟计算,通过分析计算结果与理论计算的误差,采用标准κ-epsilon模型作为数值模拟计算模型更为合适。开展了连续管钻井系统盘管摩阻压降试验,将理论计算、数值模拟计算与试验数据进行比较,在绝大多数试验流量测点处,它们的误差范围均在10%以下,数值模拟计算和理论计算结果与试验测量值具有较好的一致性,说明选择的理论计算模型和数值模拟计算模型正确,且有一定的适用性。研究成果对连续管钻井现场作业具有一定的指导作用。
With minor diameter and high flow resistance of coiled tubing, it is necessary to study pressure drops due to friction resistance in coiled tubing drilling system. Based on theoretical researches, relevant calcula- tion models are identified. Moreover, calculation models for friction resistance conforming to actual conditions in drilling operations involving coil tubing are established. In total, 4 types of models are identified to perform numeri- cal simulation with multiple specifications of coiled tubing and flow rates of fluids. Through comparison of analysis results and theoretical calculation, it was determined that the standard K-epsilon Model may serve as preferred cal- culation model for numerical simulation. Tests for pressure drops induced by friction resistance in coiled tubing have been conducted for coiled tubing drilling system. Through comparison of theoretical calculation, numerical simula- tion and experimental data, it was found that flow rates at majority of monitoring points have errors less than 10%. Conformability among numerical simulation, theoretical calculation and experiments proves the right choice in se- lection of suitable theoretical calculation model and numerical simulation calculation model. The research results may provide necessary guidance for operations on drilling site with coiled tubing.
出处
《石油机械》
2015年第2期22-26,33,共6页
China Petroleum Machinery
基金
国家科技重大专项"连续油管装备与应用技术"(2011ZX05036-006)
中国石油科技创新基金项目"连续油管钻井系统流体流动模型研究"(2012D-5006-0307)
非常规油气湖北省协同创新中心创新基金项目"连续油管页岩气水平井多段压裂工具研制"(HBUOG-2014-8)
关键词
连续管
摩阻梯度
弯曲比率
数值模拟
计算模型
coiled tubing
friction resistance gradient
curvature rate
numerical simulation
calculationmodel
