排601北区边底水治理优化研究

Study on Technique for Shutting Off the Edge and Bottom Water of the North of Pai601 Block

摘要: 边底水稠油油藏在我国稠油油藏中占有很大比例。在稠油热采过程中，边底水在提供能量的同时，也会带来一些不利的影响。在蒸汽吞吐过程中，如何对边水侵入、底水锥进进行有效的治理，是边底水稠油油藏开发中需要解决的一个关键问题。本论文对排601北区的地质特征、开发特征与水体来源进行了分析，并得出高含水井主要分布在靠近断层处且水体来源主要为断层外侧边水。通过数值模拟方法，建立了排601北区的概念模型，对水平井边水入侵的影响因素进行了分析，得到了水平井距边水距离、边水能量大小、水平渗透率等因素对水平井边水侵入的影响程度。建立了排601北区的三维地质模型，对边部生产井的生产动态进行了历史拟合，并对原开发方式进行了效果预测，分析出如果不采取封堵措施，边部井将整体水淹严重，必须采取有效的封堵措施。通过数值模拟模型设计一系列方案，对封堵措施的堵剂注入时间以及各井的堵剂注入量进行了优化，通过封堵效果评价，可以发现优化后的措施堵水增油效果明显，为区块后续转驱创造了比较好的条件。

Abstract: Edge and bottom water heavy oil reservoirs account for a large proportion of heavy oil reservoirs in China. In the process of heavy oil thermal recovery, edge and bottom water not only provide energy, but also bring some adverse effects. Effective management of edge water intrusion and bottom water coning during steam stimulation is a key issue that needs to be addressed in the development of edge and bottom water heavy oil reservoirs. This paper analyzes the geological characteristics, development characteristics, and water source of the north area of Pai601, and concludes that high water content wells are mainly distributed near the fault and the water source is mainly from the outer edge of the fault. By using numerical simulation methods, a conceptual model of the north area of Pai601 was established, and the influencing factors of horizontal well edge water intrusion were analyzed. The degree of influence of factors such as the distance between horizontal wells and edge water, edge water energy, and horizontal permeability on horizontal well edge water intrusion was obtained. A three-dimensional geological model was established for the north area of Pai601, and the production dynamics of the edge production wells were historically fitted. The effectiveness of the original development method was predicted, and it was analyzed that if no sealing measures were taken, the edge wells would be severely flooded and effective sealing measures must be taken. A series of schemes were designed through numerical simulation models to optimize the injection time of plugging agents and the injection amount of plugging agents in each well. Through the evaluation of the plugging effect, it can be found that the optimized measures have a significant effect on water plugging and oil increase, creating favorable conditions for the subsequent conversion of the block.