某油田低渗透油藏水平井加密及跟踪调整提产

doi:10.7657/XJPG20230509

摘要/Abstract

摘要：

某油田储集层物性差，纵向上层数少，厚度小，小断层发育且展布方向复杂，直井开发效果差，现有井网难以建立有效驱替体系。在老水平井和2014年先导试验加密水平井开发效果均较好的基础上，在注水受效差的直井区及断层附近未动用区，开展加密水平井及跟踪调整技术研究。通过井震和动静态结合分析，优选储集层发育稳定、水淹风险小且剩余油富集的加密区；通过水平井方位和水平段长度优化，压裂加密布缝及优化缝长，提高水平井产能；通过早期间注及隔强临弱的注水跟踪调整，优化注采方式。按照以上方法，该油田2019年加密水平井19口，砂岩钻遇率达到83.0%，初期单井日产油量为7.4 t，综合含水率为28.8%，建立了有效驱替体系，油田的采油速度由0.8%提高到1.5%，提高了油田的开发效果。

关键词: 低渗透油藏, 精细描述, 剩余油, 井震结合, 动静态结合, 加密水平井, 压裂, 注水调整

Abstract:

In X oilfield, the reservoirs exhibit poor physical properties, a small number of layers vertically, and the presence of small faults in complex distribution, which lead to poor effect of vertical well development and ineffecient displacement of the existing well pattern. Based on the successful development of pre-existing horizontal wells and infilled horizontal wells in the pilot test in 2014, a study was conducted on horizontal well infilling and tracking adjustment techniques in the areas with inefficient waterflooding by vertical wells and in the unswept areas near fault zones. Through logging-seismic combination and comprehensive dynamic-static analysis, the areas with stable reservoirs, low water-out risk, and enriched remaining oil were identified for well infilling. By optimizing the orientation and horizontal section length of horizontal wells, the fracturing density and fracture length were optimized to enhance the productivity of horizontal wells. The injection-production process was optimized by implementing the waterflooding tracking adjustment strategy of early-stage intermittent water injection and weak injection via the injector in an adjacent row + strong injection via the injector in a row apart. Following these approaches, a total of 19 infilling horizontal wells were drilled in the X oilfield in 2019, achieving a sandstone-encountered rate of 83.0%. The initial daily oil production per well reached 7.4 t, with a comprehensive water cut of 28.8%. An effective displacement system was established, resulting in an increase in the oilfield’s production rate from 0.8% to 1.5%, and improving the overall development effect of X oilfield.

Key words: low permeability reservoir, fine description, remaining oil, logging-seismic combination, dynamic-static analysis, infilling horizontal well, fracturing, water injection adjustment

中图分类号:

TE341

周佳美. 某油田低渗透油藏水平井加密及跟踪调整提产[J]. 新疆石油地质, 2023, 44(5): 577-582.

ZHOU Jiamei. Horizontal Well Infilling and Water Flooding Tracking Adjustment for Production Increase in Low Permeability Reservoirs in X Oilfield[J]. Xinjiang Petroleum Geology, 2023, 44(5): 577-582.

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位置	风险级别	水驱前缘与裂缝距离/m	累计注水强度/（m³·m^-1）	注水周期	配注强度/ （m³·d^-1·m^-1）
邻排	高风险区	<100	>1 000	间注关井
	次高风险区	100~150	>2 000	开7天关30天	1.0~1.2
	中风险区	150~200	>3 000	开1个月关3个月	1.2~1.4
	低风险区	其他范围	其他范围	开1个月关2个月	1.4~1.6
隔排	次高风险区	200~250	>4 000	开2个月关1个月	1.6~1.7
	中风险区	250~300	>6 000	开3个月关1个月	1.7~1.9
	低风险区	>300	>7 000	开6个月关1个月	1.9~2.1
	无风险区	其他范围	其他范围	连续注水	2.1~2.3