新疆石油地质

新疆石油地质 ›› 2021, Vol. 42 ›› Issue (4): 437-443.doi: 10.7657/XJPG20210406

• 油藏工程 • 上一篇    下一篇

水平井分段分簇压裂缝间干扰和段间干扰建模——以昌吉油田吉7井区八道湾组油藏为例

承宁1a(), 郭旭洋2(), 魏璞1b, 黄雷2, 王亮1a   

  1. 1.中国石油 新疆油田分公司 a.工程技术研究院;b.石西油田作业区,新疆 克拉玛依 834000
    2.中国石油大学（北京） a.油气资源与探测国家重点实验室;b.石油工程学院,北京 102249
  • 收稿日期:2020-05-21 修回日期:2020-07-09 出版日期:2021-08-01 发布日期:2021-08-09
  • 通讯作者: 郭旭洋 E-mail:cning-kcscy@petrochina.com.cn;xguo@cup.edu.cn
  • 作者简介:承宁（1968-）,男,河南鄢陵人,高级工程师,油气田开发,（Tel）13999309365（E-mail） cning-kcscy@petrochina.com.cn
  • 基金资助:
    国家自然科学基金(51904314);国家自然科学基金(U19B6003)

Inter-Fracture and Inter-Section Interference Modeling for Staged and Clustered Fracturing Stimulation in Horizontal Wells: A Case Study on Reservoirs of Badaowan Formation in Wellblock Ji 7 in Changji Oilfield

CHENG Ning1a(), GUO Xuyang2(), WEI Pu1b, HUANG Lei2, WANG Liang1a   

  1. 1. PetroChina Xinjiang Oilfield Company, a.Research Institute of Engineering Technology; b.Shixi Oilfield Operation District, Karamay, Xinjiang 834000, China
    2. China University of Petroleum, a.State Key Laboratory of Petroleum Resources and Prospecting; b.School of Petroleum Engineering, Beijing 102249, China
  • Received:2020-05-21 Revised:2020-07-09 Online:2021-08-01 Published:2021-08-09
  • Contact: GUO Xuyang E-mail:cning-kcscy@petrochina.com.cn;xguo@cup.edu.cn

RichHTML

13

PDF

260

摘要：

昌吉油田吉7井区八道湾组油藏开发过程中直井水力压裂的储集层改造效果有限,产能受到限制,需要开展水平井多级压裂。针对吉7井区八道湾组的地质力学特征,采用扩展有限元法编制了非平面人工裂缝扩展模型,模型考虑了多簇裂缝同时扩展时的缝间干扰和分段压裂时邻近段的段间干扰,表征了吉7井区八道湾组水平井非平面裂缝扩展特征。结果显示,段内缝间干扰会抑制中间簇裂缝半长,使得外侧裂缝的缝宽更大、裂缝半长更长;缝间干扰和簇间干扰使得裂缝扩展呈现非平面特征,在几何形态上具有一定曲率。通过与压裂施工数据和微地震监测数据对比,认为裂缝数值模拟结果与现场数据拟合程度较好,模型在目标区域的应用效果较好。在吉7井区八道湾组开展水平井多级压裂实验,单井日产油量达到了同井区直井的7.8倍,取得明显成效。

关键词: 昌吉油田, 八道湾组, 水平井, 分段分簇压裂, 压裂裂缝, 数值模拟, 岩石力学特征, 缝间干扰, 段间干扰

Abstract:

In developing the reservoir of the Badaowan formation in Wellblock Ji 7 in Changji oilfield, the results of hydraulic fracturing stimulation in vertical wells are unsatisfactory, and the post-fracturing productivity is limited, so that it is necessary to apply multi-stage fracturing stimulation in horizontal wells. According to the geomechanical characteristics of the reservoir in the Badaowan formation in Wellblock Ji 7, a non-planar artificial fracture propagation model was established using the extended finite element method. By taking into account inter-fracture interference while multiple clusters of fracture propagating simultaneously and the inter-section interference during staged fracturing stimulation, the model characterizes the non-planar fracture propagation in horizontal wells drilled in the Badaowan formation in Wellblock Ji 7. The results show that the inter-fracture interference induced in a section inhibits the half-length of middle fracture clusters, but makes a wider and longer half-length of the fractures on both sides; the inter-fracture interference and the inter-cluster interference make fracture propagation non-planar, and show a certain curvature in geometrical morphology. According to comparative analysis of fracturing data and microseismic data, the modeling results are consistent with the measured data, proving that good application results have been obtained in target zones. A multi-stage fracturing test was carried out in the Badaowan formation in a horizontal well in Wellblock Ji 7. The daily post-fracturing oil production of the horizontal well was 7.8 times that of a vertical well in the same well block, indicating a significant development effect.

Key words: Changji oilfield, Badaowan formation, horizontal well, staged and clustered fracturing stimulation, hydraulic fracture, numerical simulation, geomechanical characteristic, inter-fracture interference, inter-section interference

中图分类号: