Volume 32 Issue 6
Nov.  2015
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FENG Yongchao, WU Xingxing, DANG Binghua, XU Tongtai, WANG Xiang, XIAO Weiwei. Characteristics and Instability of Yan'an FormationCoalbeds in Jinghe Oilfield[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(6): 46-49. doi: 10.3969/j.issn.1001-5620.2015.06.012
Citation: FENG Yongchao, WU Xingxing, DANG Binghua, XU Tongtai, WANG Xiang, XIAO Weiwei. Characteristics and Instability of Yan'an FormationCoalbeds in Jinghe Oilfield[J]. DRILLING FLUID & COMPLETION FLUID, 2015, 32(6): 46-49. doi: 10.3969/j.issn.1001-5620.2015.06.012

Characteristics and Instability of Yan'an FormationCoalbeds in Jinghe Oilfield

doi: 10.3969/j.issn.1001-5620.2015.06.012
  • Received Date: 2015-07-25
  • Publish Date: 2015-11-30
  • In drilling the Yan'an Formation(coalbeds) in Jinghe Oilfield, borehole instability has long been a problem.Analyses of the drilling and wireline logging data show that one third of the coalbeds have been moderately or severely collapsing during drilling, with average hole enlargement over 10%.It has been found that, the Yan'anFormation as a whole does not destabilize badly, most of the coalbeds are dull coals, which are generally stable and do not collapse.The collapse of the coalbeds during drilling has been caused by the lack of plugging and sealing capacity of the drilling fluid used, and the existence of fractured coalbeds and poor quality coalbeds with mudstone interlayers.

     

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