1887

Abstract

Summary

Most of the old oilfields in eastern China have already entered into an ultrahigh water cut period, but their annual oil production and remaining recoverable reserves still occupy a pivotal position. Due to severe edge-bottom water coning, the main horizontal production well G104-5P70 of Gao104–5 block in Jidong oilfield has seen an early water breakthrough while a large amount of remaining oil is still stuck in the high structural region. An innovative in-depth fluid diversion technique, gel barrier placement (GBP), proves to be a promising approach to tap the potential of remaining oil in the period of ultrahigh water cut, which involves injecting gel into the horizontal well at the toe end to form ‘gel barriers’, then the edge-bottom water will bypass these barriers and be diverted into the upper zones where the remaining oil is relatively enriched.

In this present work, sensitivity analysis was carried out to study the influence of plugging location, plugging size and plugging strength on the in-depth fluid diversion effect, and optimization design of the plugging system was then conducted with regard to the agent dosage and slug combination. Simulation results indicate that: (1) the main plugging location should be the upper two layers while the appropriate angle between gel barrier and horizontal wellbore is 45°; (2) an obvious water plugging effect is observed for gel barriers with radial slug length of 80m, horizontal probing thickness of 10m and vertical plugging ratio of 0.6; (3) with the permeability reduction factor around 0.05, gel barrier placement will ensure a comparatively high enhanced oil recovery; (4) three-round injection mode is designed to apply on 1500m3 compound plugging agent for the gel barrier placement. Field application shows that the designed GBP is valid for two years with increased oil amount of 1670t and enhanced oil recovery of 6.4%. Compared with traditional profile control techniques, gel barrier placement has prolonged the water control period, improved the plugging accuracy and reduced the plugging agent dosage. It will provide an effective reference for similar edge-bottom water reservoirs in ultrahigh water cut period to further enhance oil recovery.

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/content/papers/10.3997/2214-4609.201700280
2017-04-24
2020-09-21
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References

  1. Bai, B., Li, L., Liu, Y., Wang, Z., and Liu, H.
    [2004] Preformed particle gel for conformance control: Factors affecting its properties and applications. SPE/DOE Symposium on Improved Oil Recovery, SPE 89389.
    [Google Scholar]
  2. Chen Tielong
    . [2006] Enhanced Oil Recovery by Weak Gel Flooding. Petroleum Industry Press, Beijing.
    [Google Scholar]
  3. Coste, J.-P., Liu, Y., Bai, B., LI, Y., Shen, P., Wang, Z., and Zhu, G.
    [2000] In-depth fluid diversion by pre-gelled particles: laboratory study and pilot testing. SPE/DOE Improved Oil Recovery Symposium, SPE 59362.
    [Google Scholar]
  4. Diaz, D., Somaruga, C., Norman , C. and Romero, J. L.
    [2008] Colloidal dispersion gels improve oil recovery in a heterogeneous Argentina waterflood. SPE Symposium on Improved Oil Recovery, SPE 113320.
    [Google Scholar]
  5. HuangFusheng, ChenWeijia, FangLiang, HuangXiuping and TaoMing
    . [2006] Solution of ineffective circulation in Lamadian Oilfield. Petroleum Geology & Oilfield Development in Daqing, 25(1), 40–42.
    [Google Scholar]
  6. HuangXiuping, HuangFusheng, LuShuangfang and FangLiang
    . [2004] Identification method of ineffective circling of injection-production in high water cut period in Lamadian Oilfield. Petroleum Geology & Oilfield Development in Daqing, 26(1), 46–80.
    [Google Scholar]
  7. Liang, J.-T. and Seright, R. S.
    [1994] Further investigations of why gels reduce water permeability more than oil permeability. SPE Production & Facilities, 12(4), 225–230.
    [Google Scholar]
  8. LiuYuzhang, LvJing, WangJialu, GaoJian and LiYikun
    . [2011] Physical modeling of in-depth fluid diversion by ‘gel dam’ placed with horizontal well. Petroleum Exploration and Development, 38(3), 332–335.
    [Google Scholar]
  9. LvJing, LiuYuzhang, WangJialu, WangQiang and LiYikun
    . [2011] Numerical simulation of ‘gel dam’ in-depth fluid diversion technique in horizontal well. Journal of Southwest Petroleum University (Science & Technology Edition), 33(4), 117–121.
    [Google Scholar]
  10. MaHongwei, LiuYuzhang, LiYikun and XiongChunming
    . [2008] Deep fluid diverting mechanism of soft diverting agent. Petroleum Exploration and Development, 35(6), 420–424.
    [Google Scholar]
  11. Mack, J.C. and Smith, J.E.
    [1994] In-depth colloidal dispersion gels improve oil recovery efficiency. SPE/DOE Improved Oil Recovery Symposium, SPE 24480.
    [Google Scholar]
  12. Nguyen, Q. P., Zitha, P. L. J., Currie, P. K. and Rossen, W. R.
    [2005] CT Study of Liquid Diversion With Foam. SPE Production Operations Symposium, SPE 93949.
    [Google Scholar]
  13. Nilsson, S., Stavland, A. and Jonsbraten, H. C.
    [1998] Mechanistic study of disproportionate permeability reduction. SPE/DOE Improved Oil Recovery Symposium, SPE 39365.
    [Google Scholar]
  14. Seright, R. S.
    [1997] Use of preformed gels for conformance control in fractured systems. SPE Production & Facilities, 12(1), 59–65.
    [Google Scholar]
  15. Song, W., Zeng, X., Yao, H., Li, J., Lv, X., Tian, Y., and Guo, Y.
    [2002] Application of a new crosslinked polymer displacement technology at Bo-19 block in Gudao Oilfield. SPE Asia Pacific Oil and Gas Conference and Exhibition, SPE 77797.
    [Google Scholar]
  16. TangXiaofen, WuQi, LiuGehui, GuShuren and LiHongyan
    . [2003] Field test on integral modifying and flooding project in regional reservoir with weak gel. ACTA PETROLEI SINICA, 24(4), 58–61.
    [Google Scholar]
  17. WangDexi, ZhangJianjun, GaoZhigang, YuXinghua and WangChuan
    . [2007] Potential excavation technology for thick formations of extra high water cut period in Lamadian Oilfield. ACTA PETROLEI SINICA, 28(1), 98–100.
    [Google Scholar]
  18. XiongChunming and TangXiaofen
    . [2007] Technologies of water shut-off and profile control: An overview. Petroleum Exploration and Development, 34 (1), 83–88.
    [Google Scholar]
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