Volume 33 Issue 6
Nov.  2016
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ZHAO Hu, LONG Daqing, SI Xiqiang, WANG Shanju, SHI Peiqian, LIU Jiezheng, WU Jian. Study on Alkyl Polyglucoside Derivative Drilling Fluid and Its Use In Shale Gas Drilling[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(6): 23-27. doi: 10.3969/j.issn.1001-5620.2016.06.004
Citation: ZHAO Hu, LONG Daqing, SI Xiqiang, WANG Shanju, SHI Peiqian, LIU Jiezheng, WU Jian. Study on Alkyl Polyglucoside Derivative Drilling Fluid and Its Use In Shale Gas Drilling[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(6): 23-27. doi: 10.3969/j.issn.1001-5620.2016.06.004

Study on Alkyl Polyglucoside Derivative Drilling Fluid and Its Use In Shale Gas Drilling

doi: 10.3969/j.issn.1001-5620.2016.06.004
  • Received Date: 2016-11-08
  • Publish Date: 2016-11-30
  • The YS108 shale gas block is located in Huangjinba, Zhaotong, Yunnan Province, and the pay zone of this block is the Longmaxi formation of the lower Silurian series. The lithology of the pay zone is mainly gray, black shales which are easy to slough and collapse. In horizontal drilling, high friction and drag, pipe sticking and diffculties in hole cleaning are problems that have been frequently encountered. To mitigate these diffculties, an alkyl polyglucoside (APG) derivative drilling fluid was formulated with NAPG, CAPG and APG as the main additives. NAPG is a polyether amino APG made from APG by introducing polyether and amino groups into the APG molecular structure. NAPG has better inhibitive capacity, high temperature stability and lubricity. CAPG is made from APG by introducing quaternary ammonium group into the APG molecular structure. CAPG has better inhibitive capacity and high temperature stability. NAPG and CAPG effectively reduce the Zeta potential and hence the activity of shales. APG was used in the drilling fluid as the main lubricant, plugging agents of different sizes (0.03-100 μm) and low molecular weight alkyl glucoside viscosifer were used to satisfy the needs of plugging micro fractures found in the Longmaxi shales. This drilling fluid had 7.5 min API flter loss of 0 mL, HTHP flter loss≤5 mL. The extreme pressure friction coeffcient was less than 0.10 if mud density was less than 2.30 g/cm3. As a drilling fluid with strong inhibitive capacity, good plugging capacity and good lubricity, the APG derivative drilling fluid successfully helped solve the diffculties previously encountered. In feld application, gauge hole, good hole cleaning and good lubricity were obtained. Compared with 6 wells drilled nearby with high performance water base drilling fluids and wells drilled in an adjacent block, the well drilled with this drilling fluid had ROP increased by 14.6%-18.8%. The use APG derivative drilling fluid has satisfed the needs for horizontal shale gas drilling and well completion.

     

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