极端耗水层带形成机制及流场调控增效模式——以陆相砂岩特高含水后期整装油田为例

doi:10.13809/j.cnki.cn32-1825/te.2024.02.009

Abstract

Abstract:

Represented by the integrated oilfield of the continental sandstone reservoir in Shengli Oil Zone, the main unit of which has entered the late stage of ultra-high water cut（>95%）. This stage has led to significant challenges, including extreme water consumption in certain areas, a sharp increase in the water-to-oil ratio, a marked decline in the utilization rate of injected water, rising operating costs per ton of oil, and diminishing economic returns. Despite these issues, approximately 60% of the remaining geological reserves are still present in the reservoir, making the widespread drilling of new wells economically unfeasible. The primary obstacles to profitable development at this stage include the preferential flow of injected water through zones of extreme water consumption and limited dynamic sweep efficiency. Addressing the identification, description, and management of these extreme water consumption zones is crucial for achieving profitable development in maturing oilfields with ultra-high water cuts. This paper suggests a comprehensive approach to tackle these challenges. It involves understanding the formation and control mechanisms of extreme water consumption zones, characterizing reservoir heterogeneity based on configuration and lithology, quantitatively describing the distribution of these zones, and devising strategies to regulate their expansion using variable streamlines in existing wells. The goal is to develop a suite of profitable development technologies that enable precise reservoir characterization and effective management of extreme water consumption zones in the late ultra-high water cut stage. Traditionally, a reservoir with a 98% water cut is considered nearly depleted. However, by applying key technologies for flow field regulation and benefit enhancement to a demonstration unit within such a reservoir, its economic lifespan can be extended by over a decade. This approach can stabilize annual oil production, reduce water cut, lower operating costs per ton of oil, and facilitate low-cost development in maturing oilfields at the late ultra-high water cut stage, thereby addressing the economic and operational challenges inherent in this phase of development.

Key words: continental reservoir, the late stage of ultra-high water cut, extreme water consumption zone, flow field regulation, benefit enhancement mode, key technology

CLC Number:

TE341

SHU Ningkai,LIU Lijie,YAO Xiutian,HUANG Yingsong,LAI Fengpeng,CUI Wenfu. Formation mechanism of extreme water consumption zone and synergistic mode of flow field regulation: A case study of uncompartmentalized oilfield of continental sandstone in the late stage of ultra-high water cut[J].Petroleum Reservoir Evaluation and Development, 2024, 14(2): 237-246.

Figures/Tables 14

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单元名称	地下原油黏度/ （mPa·s）	渗透率/ 10^-3μm²	渗透率级差	突变点时机
单元名称	地下原油黏度/ （mPa·s）	渗透率/ 10^-3μm²	渗透率级差	含水/ %	采出程度/ %
埕4馆3-4砂组	44.0	2 550	10.1	96.7	41.4
埕24馆2-3砂组	44.0	2 520	10.1	95.9	28.9
胜二区沙二3砂组	11.0	2 100	4.1	93.0	28.0
胜一区坨103沙二 8砂组	2.5	372	11.9	93.7	46.8
胜二区沙二8砂组 3-5小层	24.0	2 400	5.8	93.5	30.5
孤东七西馆5砂组 2-3小层	38.4	1 767	1.7	96.3	36.4
孤岛中二中馆5砂组	298.0	1 870	10.5	92.4	20.7
坨28块东一段	409.0	816	3.3	93.0	11.6
平均值				94.3	30.5

序号	渗透率/ 10^-3μm²	含水/ %	采出程度/ %	注入倍数	是否上翘	瞬间吸水量/（mL/min）
1	3 042	98.7	58.4	5.40	是	2.870
2	2 141	85.0	39.3	1.10	否	1.607
3	1 035	74.5	27.9	0.53	否	0.023
合采	2 072	96.0	46.6	2.40	是	4.500

沉积相	第一种平板模型渗透率/10^-3 μm²			第二种平板模型渗透率/10^-3 μm²
沉积相	左区	中区	右区	左区	中区	右区
河道边缘Ⅲ	575	500	571	496	500	513
河道边缘Ⅱ	972	1 000	939	2 280	2 000	2 180
主河道Ⅰ	2 830	3 000	2940	4 990	5 000	4 950
河道边缘Ⅱ	967	1 000	930	2 140	2 000	2 250
河道边缘Ⅲ	480	500	494	498	500	506

极端耗水层带类型	剩余油分布特征	流场调控模式	典型单元
平面极端耗水带	非主流线等弱驱部分剩余油富集	井网转换	孤岛西区北馆3—4砂组
层间极端耗水层	次主力层、非主力层剩余油富集	纵向细分	胜坨油田坨11南沙二8砂组
层内极端耗水段	层内中上部剩余油富集	整体侧钻	孤东七区西馆5砂组2—3小层

Formation mechanism of extreme water consumption zone and synergistic mode of flow field regulation: A case study of uncompartmentalized oilfield of continental sandstone in the late stage of ultra-high water cut

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