Volume 37 Issue 1
Feb.  2020
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LI Qiang, LI Zhiyong, ZHANG Haodong, SUN Hansen, LI Linyuan, LI Xingang, WANG Yue. Study on Foam Drilling Fluid Stabilized with Nanomaterials Optimized with RSM[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(1): 23-30. doi: 10.3969/j.issn.1001-5620.2020.01.004
Citation: LI Qiang, LI Zhiyong, ZHANG Haodong, SUN Hansen, LI Linyuan, LI Xingang, WANG Yue. Study on Foam Drilling Fluid Stabilized with Nanomaterials Optimized with RSM[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(1): 23-30. doi: 10.3969/j.issn.1001-5620.2020.01.004

Study on Foam Drilling Fluid Stabilized with Nanomaterials Optimized with RSM

doi: 10.3969/j.issn.1001-5620.2020.01.004
  • Received Date: 2019-08-29
  • Publish Date: 2020-02-28
  • Nanomaterials have been used to improve the stability of foam drilling fluids, and the effects of the wettability of the nanomaterials on the foam quality were studied using three-factor three-level response surface methodology (RSM) in accordance with the Box-Behnken Design principle. In the studies the concentrations of the foaming agent BS-12, the hydrophilic nanoSiO2 and the viscosifier XC were optimized, and the effects of their interaction on the comprehensive performance of the foam were investigated. A new foam drilling fluid was designed based on these studies. It was found in the studies that the wettability of the nanomaterials remarkably affected the foam quality of the foaming agents. Hydrophobic nanomaterials was able to enhance the stability of the foam produced with an ionic foaming agent SDS. Increased treatment of the hydrophobic nanomaterials decreased the foam quality and halflife of the foam produced with an amphoteric foaming agent BS-12. The optimized foam mud was obtained using RSM design, which is: 0.6%BS-12 + 4%Nano SiO2+0.3%XC. RSM analysis showed that order of magnitude of effect of the concentrations of the three agents on the comprehensive performance of the foam is: nanomaterial > foaming agent > XC. Laboratory evaluation showed that this foam drilling fluid had apparent viscosity of 42 mPa·s, density of 0.81 g/cm3, half life of 60 h, meaning that the foam drilling fluid is able to sustain its stability for a long time. The foam drilling fluid also showed strong shale inhibitive capacity; the linear expansion rate is 65% lower than that of clean water. The recovery rate of coal rock core gas permeability is over 90%, and settling velocity of rock and coal cuttings in the foam drilling fluid was reduced by at least 92% compared with clear water, indicating that the foam drilling fluid had both good reservoir protection performance and good cuttings carrying capacity. The results of the performance evaluation test showed that this foam drilling fluid is able to satisfy the needs of coal-bed methane drilling.

     

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