Volume 35 Issue 6
Nov.  2018
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ZHANG Xiaodong, FAN Jiaqiang, ZU Ce, TIAN Yulong, LI Shuang, HUANG Jie, LIU Qiang. Study and Application of a Weak Gel Micro Foam Drilling Fluid in Horizontal Wells through Loose Sand in Venezuela[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(6): 77-81. doi: 10.3969/j.issn.1001-5620.2018.06.014
Citation: ZHANG Xiaodong, FAN Jiaqiang, ZU Ce, TIAN Yulong, LI Shuang, HUANG Jie, LIU Qiang. Study and Application of a Weak Gel Micro Foam Drilling Fluid in Horizontal Wells through Loose Sand in Venezuela[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(6): 77-81. doi: 10.3969/j.issn.1001-5620.2018.06.014

Study and Application of a Weak Gel Micro Foam Drilling Fluid in Horizontal Wells through Loose Sand in Venezuela

doi: 10.3969/j.issn.1001-5620.2018.06.014
  • Received Date: 2018-08-13
  • Publish Date: 2018-11-30
  • The reservoir formations in MFM sub-block of the block Ayacucho in the Orinoco heavy oil belt, southeast Venezuela, are characteristic of shallow depth of burial, low pressure, high porosity and low bottom hole temperature. Wells drilled in this block were mostly horizontal wells with long intervals. In previous drilling practices, water base polymer muds mixed with oil were commonly used, resulting in downhole troubles such as over-pull and resistance during tripping, and pipe sticking etc. A weak gel micro foam drilling fluid formulated with a flow pattern optimizer and a foaming agent has been developed in place of the water base polymer muds previously used. This weak gel micro foam drilling fluid has a density between 0.85 g·cm-3 and 1.00 g·cm-3. The low-shear-rate viscosity of the drilling fluid after being aged at 120℃ is at least 40 000 mPa·s. With this drilling fluid, problems found in the past, such as over-pull and resistance during tripping and pipe sticking, were effectively resolved. Application of the weak gel micro foam drilling fluid on the well MFM-62 and the well MFM-65 was successful; the horizontal sections of the two wells were successfully drilled, with no downhole troubles occurred. Time spent drilling the horizontal sections was reduced from 12 d to 4 d. Daily oil production rate was 90 t, 40% higher than that of the adjacent wells.

     

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