Progresses in shale gas well integrity research

被引：0
|
作者：
Gao D. [1 ,2 ]
Liu K. [1 ,2 ]
机构：
[1] MOE Key Laboratory of Petroleum Engineering, China University of Petroleum(Beijing), Beijing
[2] State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing
来源：
Oil and Gas Geology | 2019年 / 40卷 / 03期
关键词：
Casing; Cement sheath; Fluid channeling; Hydraulic fracturing; Shale gas well; Unconventional oil & gas well; Well integrity;
D O I：
10.11743/ogg20190315
中图分类号：
学科分类号：
摘要：
The sustainable annular pressure (SCP) caused by sealing failure of cement sheath and the casing deformation during hydraulic fracturing, are the major well problems integrity encountered in shale gas development. Based on the existing research results, we focus on summarizing and analyzing the progresses in research of factors contributing to failure of shale gas well integrity. With the progress in researches about casing deformation during hydraulic fracturing in shale gas wells worldwide, we know that the major influential factors include temperature, stress, asymmetric fracturing in the reservoir, poor cementing and the slip of faults or natural fractures. Among them, the shear deformation mechanism of the casing in shale gas well caused by the slip of faults or natural fractures during fracturing has attracted more and more attention among the researchers. It is proposed that the casing deformation can be effectively reduced by increasing the casing strength and the cementing performance, or avoiding the areas with fault or natural fracture slips. Besides, the sealing failure of cement sheath in shale gas wells is mainly caused by yield failure of cement sheath out of pressure variation within the casing or eccentricity of casing and channeling through interface cracks. The sealing failure of cement sheath can be effectively reduced by applying expansive cement, flexible cement or annular pre-stressing techniques, while the optimization of special cement slurry system in shale gas wells is particularly important for improving the sealing integrity of cement sheath. Given the limitation of the cement sheath sealing ability, additional mechanical sealing methods can also be used to meet the requirements of sealing integrity for certain well annulus areas. The research results about the shale gas well integrity are also of referential value to the design and control of other unconventional oil & gas wells to be completed through volume-fracturing. © 2019, OIL & GAS GEOLOGY Editorial Board. All right reserved.
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页码：602 / 615
页数：13
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  • [1] George E.K., Thirty years of gas shale fracturing: What have we learned?, SPE Annual Technical Conference and Exhibition, (2010)
  • [2] Wang L., Ma J., Su F., Et al., Shale gas factory fracturing technology in North America, Drilling & Production Technology, 35, 6, pp. 48-50, (2012)
  • [3] Long S., Cao Y., Zhu J., A preliminary study on prospects for shale gas industry in China and relevant issues, Oil & Gas Geology, 37, 6, pp. 847-853, (2016)
  • [4] Chen S., Zhu Y., Wang H., Et al., Research status and trends of shale gas in china, Acta Petrolei Sinica, 31, 4, pp. 689-694, (2010)
  • [5] Xu Z., Liang X., Wang X., Et al., Shale gas reservoir characteristics of the Wufeng-Longmaxi Formations in Huangjinba construction block of the Luochang Syncline, the Sichuan Basin, Oil & Gas Geology, 38, 1, pp. 132-143, (2017)
  • [6] Han L., Sun H., Study on factory-like drilling mode for shale gas in changning, Drilling & Production Technology, 39, 6, pp. 1-4, (2016)
  • [7] Li B., Fu J., Qin F., Et al., Well pad drilling technology in the Weiyuan shale gas block, Petroleum Drilling Techniques, 45, 5, pp. 13-18, (2017)
  • [8] Yuan J., Deng J., Yu B., Et al., Well-bore stability of horizontal wells in shale gas reservoirs, Natural Gas Industry, 32, 9, pp. 66-70, (2012)
  • [9] Xue C., Technical advance and development proposals of shale gas fracturing, Petroleum Drilling Techniques, 39, 3, pp. 24-29, (2011)
  • [10] Yin C., Ye D., Duan G., Et al., Research about and application of autonomous staged fracturing technique series for horizontal well stimulation of shale gas reservoirs in the Sichuan Basin, Natural Gas Industry, 34, 4, pp. 67-71, (2014)
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