稠油底水油藏水平井分段完井方法及应用

分段完井可以有效缓解水平井过早见水,调整水平井产液剖面。利用渗流力学理论、油藏工程方法、聚类分析方法、油藏数值模拟等,建立一套底水油藏水平井分段完井和优化配产方案。首先,综合考虑储集层非均质性、压力系统、避水高度和完井成本,利用聚类分析方法对水平井进行合理分段;然后,通过油藏渗流和井筒管流耦合模型,以各段均衡产液为原则,计算最优附加阻力;最后,利用油藏数值模拟结果,对分段完井和传统裸眼完井进行对比,验证该方法的可靠性。研究结果在曹妃甸油田群和秦皇岛32-6油田得到广泛应用,水平井平均见水时间推迟152 d,提高采收率3%~5%.

A Method and Application of Horizontal Well Segmentation in Heavy Oil Reservoirs With Bottom Water

Segmented well completion technology can cope with the problems of early water breakthrough and liquid profile modification in horizontal wells.The paper establishes a set of methods of segmented well completion and optimized production allocation in horizontal wells in the reservoirs with bottom water by using flowing mechanics theory,reservoir engineering method,clustering analysis method and reservoir numerical simulation.Firstly,based on the comprehensive consideration of reservoir heterogeneity,pressure system,water avoid ance height and well completion cost,a horizontal well is reasonably segmented by using clustering analysis method.Then the optimum ad ditional resistance is calculated on the basis of a seepage pipe coupling model and the principle of balanced liquid production in each seg ment.Finally,reservoir numerical simulation is used to compare the results of segmented well completion and conventional open hole com pletion to verify the reliability of the method.The actual applications of the method in Caofeidian oilfields and Qinhuangdao 32 6 oilfield show that the average water breakthrough time is delayed by 152 days and the recovery factor can be improved by 3%-5%.