特种油气藏 ›› 2022, Vol. 29 ›› Issue (6): 111-118.DOI: 10.3969/j.issn.1006-6535.2022.06.014

• 油藏工程 • 上一篇    下一篇

浅层超稠油水平井微压裂扩容技术及应用

申婷婷   

  1. 中国石油新疆油田分公司,新疆 克拉玛依 834000
  • 收稿日期:2022-02-21 修回日期:2022-09-10 出版日期:2022-12-25 发布日期:2023-01-10
  • 作者简介:申婷婷(1989—),女,工程师,2011年毕业于长江大学石油工程专业,现主要从事油气田开发等研究工作。
  • 基金资助:
    国家科技重大专项“大型油气田及煤层气开发”(2016ZX05012);中国石油重大科技专项“未动用稠油开采新技术研究”(2019B-1411)

Microfracturing-based Expansion Technology and Application in Shallow Ultra-heavy Oil Horizontal Wells

Shen Tingting   

  1. PetroChina Xinjiang Oilfield Company, Karamay, Xinjiang 834000, China
  • Received:2022-02-21 Revised:2022-09-10 Online:2022-12-25 Published:2023-01-10

摘要: 针对新疆油田F油田齐古组非均质油藏驱泄复合井网加密水平井与老井不均匀连通的问题,从改善水平段井筒周围渗流条件出发,提出水平井微压裂扩容改造技术。通过室内岩心实验、地质力学有限元模拟及热采数值模拟技术,分析了微压裂扩容技术的可行性及扩容后储层变化特征。结果表明:储层石英含量高,黏土矿物含量低且孔隙结构发育,有利于注水扩容改造;稳定提压过程中扩大挤注液的波及范围,进而降低周围储层有效围压,可大幅提升扩容改造程度;扩容后储层纵向位移量和孔隙度增大幅度明显优于横向,有助于上下注采井连通。微压裂扩容后经过5周期吞吐预热,油井间可快速建立热连通,预热期间周期产油、油汽比明显提升,且水平段动用程度大幅改善。研究结果可为提高驱泄复合井网的注采井间连通性提供借鉴。

关键词: 超稠油, 驱泄复合, 加密水平井, 微压裂扩容, 储层改造

Abstract: A microfracturing-based expansion technology for horizontal wells was proposed to improve the seepage conditions around the horizontal wellbore, because the infill horizontal wells were not connected to the original wells in composite well pattern under steam flooding and gravity drainage in the heterogeneous reservoirs, Qigu Formation, F Oilfield, Xinjiang Oilfield. The feasibility of microfracturing-based expansion technology and the change characteristics of expanded reservoir were analyzed by laboratory core test, geomechanical finite element simulation and thermal numerical simulation. The results show that he reservoir was high in high quartz while low in clay mineral content, and well developed with pores, which was favorable for water flooding for expansion; in the process of stable pressurization, the spread range of the injection fluid was expanded to reduce the effective confining pressure of the surrounding reservoir and significantly improve the expansion effect; the displacement and porosity of the expanded reservoir in longitudinal direction were obviously better than that in transverse direction, which is conducive to the connection of upper and lower injection-production wells. After five rounds of steam stimulation for preheating after microfracturing-based expansion, the oil wells were connected quickly. In the preheating period, the periodic oil production and oil-steam ratio were significantly improved, and the productivity of horizontal section was greatly enhanced. The study results provide a reference for improving the connectivity among injection and production wells in composite well pattern under steam flooding and gravity drainage.

Key words: Ultra-heavy oil, steam flooding and gravity drainage development, infill horizontal well, microfracturing expansion, reservoir stimulation

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