苏北盆地溱潼凹陷阜二段断块型页岩油定向井开发模式及实践

doi:10.13809/j.cnki.cn32-1825/te.2023.02.002

摘要/Abstract

摘要：

为探索溱潼凹陷断块型页岩油效益开发路径，在阜二段页岩油地质特征研究基础上，提出定向井加拟水平井压裂开发模式，实施两口井均获成功。研究结果表明：苏北盆地溱潼凹陷深凹带东西两翼为构造复杂区，发育断块型页岩油，具有“厚度大、天然缝网发育、压力系数高、可动性和可改造性好”的地质特点，不适合长水平井开发，具备定向井开发的地质条件。厚层页岩油多套层系开发，定向井矩形井网有利于开展CO₂吞吐，菱形反九点井网是CO₂驱开发的合理井网模式。采用“规模注液蓄能量+限流射孔促均衡+调节排量稳缝网+三级支撑保充填+全电泵连续施工”为主的压裂工艺技术体系，定向井“拟水平井压裂”能达到水平井的改造效果，单段改造体积较水平井提升28.6 %。页岩油定向井具有“初期产能高、见油早、返排率低、含水下降快，稳产时间长”的生产特点，单段弹性产率高、采出程度高、经济效益好，率先实现页岩油效益开发，展现了构造复杂区定向井评价页岩油的良好前景。

关键词: 效益开发, 拟水平井压裂, 定向井, 断块型页岩油, 溱潼凹陷, 苏北盆地

Abstract:

In order to explore the beneficial development path of fault-block shale oil in Qintong Sag, a development mode for the fracturing of directional wells combined with pseudo-horizontal wells has been proposed based on the study on the geological characteristics of shale oil in the second member of Funing Formation, and two wells are successfully implemented. The results show that the east and west wings of the deep sag belt of Qitong Sag in Subei Basin are structural complex areas with fault-block shale reservoirs, which are with large thick, developed natural fracture network, high pressure coefficient, and good mobility and transformability. The geological conditions here is not suitable for the development of long horizontal wells but for the directional wells. For the multi-layer development of thick shale oil, the rectangular directional well pattern is conducive to the CO₂ huff and puff, while the diamond reverse nine-spot well pattern is reasonable for the CO₂ flooding. Therefore, with the fracturing technology system based on “large-scale liquid injection energy storage & flow limiting perforation promotion and equalization & flow adjustment and fracture-stabilizing network & three-stage support and maintenance filling & continuous construction with all electric pumps”, the fracturing of the directional wells took as the “pseudo-horizontal well” can achieve the transformation effect of the horizontal wells, and the transformation volume of the single stage is 28.6 % larger than that of horizontal wells. This new develop mode of shale oil has high initial productivity, early oil breakthrough time, low flowback rate, fast water cut decline, and long stable production time. The single stage has high elastic productivity, high recovery degree, and good economic benefits, realizing beneficial development of shale oil in advance. The beneficial development shows a good prospect for the evaluation of shale oil in complex structural areas by the directional wells.

Key words: beneficial development, pseudo-horizontal well fracturing, directional well, fault-block shale oil, Qintong Sag, Subei Basin

中图分类号:

TE357

姚红生,云露,昝灵,张龙胜,邱伟生. 苏北盆地溱潼凹陷阜二段断块型页岩油定向井开发模式及实践[J]. 油气藏评价与开发, 2023, 13(2): 141-151.

YAO Hongsheng,YUN Lu,ZAN Ling,ZHANG Longsheng,QIU Weisheng. Development mode and practice of fault-block oriented shale oil well in the second member of Funing Formation, Qintong Sag, Subei Basin[J]. Reservoir Evaluation and Development, 2023, 13(2): 141-151.

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