Volume 36 Issue 1
Feb.  2019
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YUAN Qingsong, FENG Hui, ZHANG Dong, LI Zhongming, DAI Lei, DONG Guoguo. Study of a Strong Plugging Drilling Fluid Used in Shale Gas Drilling in He’nan Province[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(1): 29-35. doi: 10.3969/j.issn.1001-5620.2019.01.006
Citation: YUAN Qingsong, FENG Hui, ZHANG Dong, LI Zhongming, DAI Lei, DONG Guoguo. Study of a Strong Plugging Drilling Fluid Used in Shale Gas Drilling in He’nan Province[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(1): 29-35. doi: 10.3969/j.issn.1001-5620.2019.01.006

Study of a Strong Plugging Drilling Fluid Used in Shale Gas Drilling in He’nan Province

doi: 10.3969/j.issn.1001-5620.2019.01.006
  • Received Date: 2018-08-19
  • Publish Date: 2019-02-28
  • Downhole troubles such as borehole wall collapse and hole enlargement were frequently encountered during shale gas vertical drilling in Zhongmou county and Wen county, He’nan. Analyses of the geological characteristics of the reservoirs and test on the drilling fluids used in offset wells showed that the occurrence of the downhole troubles came from the lack of plugging capacity of the drilling fluid used. Based on this idea, studies were conducted on the formulation of the drilling fluid, focusing on the inhibitive capacity and plugging capacity of the drilling fluid. Two plugging agents, HSM and HGW, and a shale inhibitor HAS were selected to formulate the drilling fluid. Laboratory test of drilling fluid showed that it had good rheology after aging for 72 h at 100 ℃. Percent recovery of shale cuttings in hot rolling test was 98.5%. 10 h linear swelling rate of an artificial shale core tested with the drilling fluid was only 2.34%. 6 h API and HTHP filtration rates were 7.8 mL and 9 mL, respectively, indicating good plugging performance of the drilling fluid. The drilling fluid was also resistant to contamination. In field application, a well drilled with this drilling fluid experienced no borehole wall collapse and sloughing, percent hole enlargement was reduced from 21% to only 6%, proving that the drilling fluid has satisfied the needs of drilling operations in the blocks in question.

     

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