大庆老区水平井的矿场试验

通过大庆老区水平井矿场试验,可挖掘油层顶部的剩余油,提高油层采收率。笔者根据水平井地质评价技术,优选了水平井矿场试验区并设计轨迹。采用地质导向技术,实时监控钻井轨迹。根据水平井钻井轨迹,选择不同的射孔方式。先后完钻2口水平井,效果差别悬殊,尤其是钻出了大庆第一口日产百吨的高产水平井。从砂体沉积类型、河道砂体规模、韵律及夹层发育状况、注采井距、避水厚度、水平段的长度和射孔层位等方面,分析对比了2口典型水平井产能的影响因素。结果表明,水平井的设计必须与三次采油、区块层位的注采井网和储层沉积类型等相结合。

Pilot test of horizontal wells in mature blocks of Daqing Oilfield

The aim of pilot test of horizontal wells in Daqing mature blocks is to develop remaining oil at the top oil layers and to find new approaches to enhance oil layer recovery. Applying geological evaluation technology of horizontal well, pilot test sites have been chosen and optimized, and wellbore trajectory have been designed. Geo-steering technique is adopted to monitor real time drilling tracks. According to horizontal well drilling tracks, different perforation patterns are selected. Two horizontal wells have been drilled successively, but the effects differ greatly. It is worth mentioning that the first high production horizontal well with production over 100 t/d as been drilled in Daqing Oilfield. The production affecting factors of the two typieal wells are analyzed from the aspects of sandbody sedimentary type, channel sandbody seale, rhythm and interlayer growth status, injection-production spaeing, water exclusion thickness, horizontal interval length and perforation horizon. Result indicates that horizontal well designing should be combined with tertiary recovery, well network pattern of block horizon and reservoir sedimentary type. The conclusion of pilot test provides an important reference for the feasibility study of horizontal wells in the mature blocks of Daqing Oilfield.