摘要
从分析水平井开采底水油藏中存在的脊进问题出发,提出了采用中心管控水完井的思路。根据渗流力学、流体力学、油藏数值模拟,建立了水平井中心管完井多段井模型,研究了底水油藏水平井中心管完井长期入流动态规律。对比了分析不同中心管插入长度条件下调控入流剖面的效果,结果表明,在给定中心管外径与套管内径之比时,中心管的插入长度是调整水平井入流剖面的关键参数,且中心管的长度存在一个最佳值。实例结果表明,当中心管长度约为水平井筒长度的0.325倍时,能够有效改善入流剖面和井筒压力分布使其均衡化,并显著地延缓底水突破时间,有效地延长无水采油期,降低含水率和提高油藏采出程度,长期入流控制效果最佳。
Starting from the analysis of problems existed in the bottom-water reservoirs in horizontal well production,an idea was proposed for water controlled completion using center casings. According to the principles of filtration mechanics,fluid mechanics and reservoir numerical simulation,a model of multi-section well for central casing completion of horizontal well production,the dynamic rules of long-term inflow in center casing completion of horizontal wells were studied in bottom water reservoirs. The effect of inflow under condition of different inserting lengths of center casings was contrasted. The result indicated that the comparison of the given center casing OD with casing ID presented that the insert length of center casing was the key parameter of inflow profile adjustment for horizontal wells,while there existed an optimal value of the center casing length. Case study result indicates that when the center casing length is about 0. 325 time as that of horizontal section,its inflow profile and borehole pressure distribution can be improved uniformly,thus the time of bottom-water breakthrough can be evidently slow down for lengthening the period of water-free oil production,reducing water content and enhancing oil recovery and as well as for the optimal effect of permanent inflow control.
出处
《石油天然气学报》
CAS
CSCD
2014年第5期110-115,7,共6页
Journal of Oil and Gas Technology
基金
国家科技重大专项(2011ZX05009-005)
关键词
水平井
中心管完井
底水油藏
多段井模型
数值模拟
horizontal well
center casing completion
bottom water reservoir
multi-segment well model
numerical simulation
