冀东油田浅层CO_2吞吐接替潜力

REPLACING POTENTIAL OF THE CO_2 HUFF-AND-PUFF IN THE SHALLOW RESERVOIRS OF JIDONG OILFIELD

冀东油田浅层油藏已整体进入特高含水开发阶段,随着二氧化碳吞吐技术的广泛应用,现有井网条件下可供优选的二氧化碳吞吐井和层的质量与数量均呈快速递减趋势,且剩余油挖潜难度增大。分析二氧化碳吞吐面临的主要问题,从定向井和水平井两个方面制定有针对性的治理方案。对于定向井,通过油藏分析,明确不同井网间剩余油潜力,研究层系归位、井网重组后回采+二氧化碳吞吐潜力;对于水平井,应用数值模拟技术,实现不同轨迹类型水平井模型产液规律可视化,明确水平井产液规律,在封堵主产液段的基础上再实施二氧化碳吞吐,进一步提高采收率。通过两类措施研究,进一步扩大了实施二氧化碳吞吐的潜力方向。

The shallow oil reservoirs of Jidong Oilfield have overall come into the high-watercut development stage.With the wide application of CO_2huff-and-puff technique,there exists the rapid decline trend in the quality and quantity of both the wells and layers that can be optimally chosen for the EOR method in the condition of the current well patterns,and moreover the difficult of tapping the residual oil potential is rather serious. By means of analyzing the main problems faced for the CO_2huff-and-puff,in the aspects of the directional and horizontal wells,the treating programs were made individually. For the former,with the help of the oil reservoir analyses,the potentials of the remained oil among the different well patterns were made clear,and then the following researches were conducted: relocation of the series of the strata,back production after the well pattern rearrangement and potential of the CO_2huff-and-puff; for the latter,by means of the numerical simulation,the visualization of the liquid production laws was realized for different-well-trajectory horizontal well models,thus the regulations were ensured,and further-more on the basis of plugging the main liquid-producing intervals,the CO_2huff-and-puff was once more operated,the recovery could be further enhanced. By the studies of the two kinds of the stimulation,the potential direction of applying CO_2huff-and-puff has been further enlarged.