Volume 36 Issue 2
Apr.  2019
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TIAN Bo, ZHOU Shanshan, WANG Tangqing, TIAN Zheng. Analysis on the Feasibility of Reducing Drilling Fluid Density with Silicate Drilling Fluid in Drilling Unstable Formations[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(2): 176-180. doi: 10.3969/j.issn.1001-5620.2019.02.008
Citation: TIAN Bo, ZHOU Shanshan, WANG Tangqing, TIAN Zheng. Analysis on the Feasibility of Reducing Drilling Fluid Density with Silicate Drilling Fluid in Drilling Unstable Formations[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(2): 176-180. doi: 10.3969/j.issn.1001-5620.2019.02.008

Analysis on the Feasibility of Reducing Drilling Fluid Density with Silicate Drilling Fluid in Drilling Unstable Formations

doi: 10.3969/j.issn.1001-5620.2019.02.008
  • Received Date: 2018-12-05
  • Publish Date: 2019-04-30
  • Drilling operations in the Pearl River Mouth Basin have been face with downhole troubles in the Paleogene System, such as borehole wall collapsing, pipe sticking and difficulties in tripping the drill string. Addressing these problems with increased drilling fluid density resulted in other problems such asdifferential pipe sticking and low time efficiency. The causes of borehole wall collapse in drilling the Paleogene System in the Pearl River Mouth Basin were analyzed through clay content analysis, SEM experiment, hot rolling test and core swelling test. The Paleogene System is developed with micro fractures, formation stress change due to drilling operation and invasion of mud filtrate into the micro fractures cause borehole wall collapse, followed by pipe sticking and difficulties in tripping the drill string. To address these problems, silicate drilling fluid was adopted to drill the Paleogene formation. Silicate drilling fluid has good inhibitive capacity and plugging capacity. It helps enhance the strengths of the rocks and reduce the collapse pressure of the formation drilled, thereby reducing the density of the drilling fluid to balance the formation pressure. Performance evaluation of an optimized silicate drilling fluid showed that its properties satisfy the requirements of drilling operations. It helps increase the cohesion and compressive capacity of rocks. Compared with the PLUS-KCl drilling fluid and oil base drilling fluid that have been already used in drilling the Paleogene formation, the optimized silicate drilling fluid performed much better; rocks immersed in the optimized silicate drilling fluid had higher compressive strength and cohesion, the cohesion was tested to be 11.7 MPa, 1.9 times of the cohesion of the rock samples immersed in PLUS-KCl drilling fluid, or 1.5 times of the cohesion of the rock samples immersed in oil base drilling fluid. These experimental results proved that silicate drilling fluid can be used to reduce the density of the drilling fluid while maintaining the borehole wall in stable condition.

     

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