六西格玛技术在氮气吞吐措施优选中的应用

Application of Six Sigma Technology in Optimization of Nitrogen Huff-Puff Measures

针对中原油田低效储层的供液能力严重不足、原油采收率低的问题,首次应用六西格玛技术对低效井进行氮气吞吐措施优选,使优选结果更加具有客观性。根据低效井筛选标准,在胡状采油区初步筛选出64口井。考虑现场实际情况,选取影响累产油的13个地质因素,利用相关性分析,得到各因素对累产油的影响程度。进行氮气吞吐措施优选时,对影响增产效果的14个因子进行合理分级。利用因子水平法得到每口井的评分,然后进行排序。根据排序结果,综合井筒状况和地面条件,优选出首批适合氮气吞吐的5口井。2020年对X2-62井进行氮气吞吐先导试验,生产初期日产油5 t,当年累积增油723 t,取得了较好的增产效果。

In view of the serious shortage of liquid supply capacity and low oil recovery of inefficient reservoirs in Zhongyuan Oilfield,nitrogen huff and puff measures for low efficiency wells are optimized using six sigma technology, which makes the optimization results more objective. According to the screening standard of low efficiency wells, 64 wells are preliminarily screened in Huzhuang oil production area. Considering the actual situation of the site, 13 geological factors affecting the cumulative oil production are selected, and the influence degree of each factor on the cumulative oil production is obtained by correlation analysis. During the optimization of nitrogen huff and puff measures, the 14 factors affecting the yield increase effect are reasonably classified. The score of each well is obtained by factor level method, and then sorted. According to the ranking result, the first batch of 5 wells suitable for nitrogen huff and puff are selected based on the wellbore conditions and surface conditions. In 2020, the pilot test of nitrogen huff and puff was carried out for well X2-62. In the initial production stage, the daily oil production of the well was 5 t, and the cumulative oil increase in that year was 723t, which achieved good stimulation effect.