水平井技术在秦皇岛32-6油田西区底水油藏中的开发实践

The development of horizontal well technology applied to bottom-water drive reservoir in the west area of QHD32-6 Oilfield

随着油田开发技术的进步,水平井开采技术日趋完善,在底水油藏应用中取得了明显效果。秦皇岛32-6油田西区是典型的底水油藏,该区主体于2002年采用定向井投入开发,投产后基本没有无水采油期,底水锥进、突破很快,经过6年多的开发已进入高含水期,至2008年初,含水83.7%,采出程度5.05%,开发效果较差。基于水平井开发底水油藏试验研究,总结出影响该区水平井开发效果两个主要因素:水平段距离油水界面高度和水平井区隔夹层分布状况。在此基础之上,通过开展隔夹层及剩余油研究,在明下段有利位置布水平井6口,并在实施中应用了随钻跟踪及先进的完井技术。该区6口水平调整井投产后初期产能约是定向井的3倍,全油田预计最终采收率提高0.36%,取得了良好的效益。

With the progress of oil field development, the production technology of horizontal well has been improved, and got good results in bottom-water drive oil reservoir. The west area of QHD32 - 60ilfield is a typical bottom-water drive oil reservoir, and the main part of this area was put into production by directional wells in 2002. However, there was no water free production period, bottom-water coning and breakthrough very fast. The area enters in high water cut after 6 years＇ production. In early 2008, water cut of this area was 83.7 %, the oil recovery level was 5.05 %, and the efficiency is low. Based on the pilot study, it is summarized that there are two main factors which influence the production of horizontal wells： the height of the horizontal well path above the OWC, and the distribution of flow barriers in the horizontal well area. Based on the study of the flow barriers and the remaining oil, we deploy 6 horizontal wells in the lower Minghua reservoir, geosteering technology and advanced well completion methods are applied to. The early productivity of the horizontal development well are about 3 times than the deviated wells of this area, the estimated total recovery efficiency of the whole oil fidd has increased by 0.36 %, and it brings in economic and social benefits.