Volume 36 Issue 6
Dec.  2019
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CHU Qi, SHI Bingzhong, LI Tao, LI Sheng, TANG Wenquan. Synthesis and Evaluation of a Low Viscosity Gelling Agent for Water Base Drilling Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(6): 689-693. doi: 10.3969/j.issn.1001-5620.2019.06.005
Citation: CHU Qi, SHI Bingzhong, LI Tao, LI Sheng, TANG Wenquan. Synthesis and Evaluation of a Low Viscosity Gelling Agent for Water Base Drilling Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(6): 689-693. doi: 10.3969/j.issn.1001-5620.2019.06.005

Synthesis and Evaluation of a Low Viscosity Gelling Agent for Water Base Drilling Fluids

doi: 10.3969/j.issn.1001-5620.2019.06.005
  • Received Date: 2019-08-25
  • Publish Date: 2019-12-30
  • A new zwitterionic hydrophobically associating polymer PAADDC has been synthesized by radical polymerization using monomers such as acrylamide (AM), 2-acrylamido-2-methylpropane sulfonic acid (AMPS), dimethyl diallyl ammonium chloride (DMDAAC), 3-dimethyl (methacryloyloxyethyl) ammonium propane sulfonate (DMAPS) and a cetyl monomer (C16-D). PAADDC was developed for improving the cuttings carrying capacity of water base drilling fluids at controlled viscosity. The PAADDC synthesized was characterized by FT-IR and 1HNMR, and its molecular weight was determined by static light scattering (SLS) method. Drilling fluids treated with 0.2% PAADDC, after aging 16 h at 100℃, had properties as follows:AV=18.5 mPa·s, PV=11.5 mPa·s, YP=7 Pa and YP/PV=0.61 Pa/mPa·s. This drilling fluid was resistant to high temperatures to 160℃. Compared with other filter loss reducers, PAADDC has better thermal stability and better suspending performance at controlled viscosity. In aging test at 60-180℃, the YP/PV ratio of the drilling fluid was decreasing with increase in the concentration of PAADDC. ESEM and AFM examination of the molecular behavior of PAADDC showed that in solution PAADDC forms a continuous 3D network structure, which is taken as the main factor of obviously increasing the shearing strength of the drilling fluids.

     

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