Volume 35 Issue 6
Nov.  2018
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ZHEN Jianwu, CHU Qi, SONG Bitao, LIU Guiwen, WANG Dong. Preparation of and Study on a High Temperature Filter Loss Reducer[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(6): 15-21. doi: 10.3969/j.issn.1001-5620.2018.06.003
Citation: ZHEN Jianwu, CHU Qi, SONG Bitao, LIU Guiwen, WANG Dong. Preparation of and Study on a High Temperature Filter Loss Reducer[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(6): 15-21. doi: 10.3969/j.issn.1001-5620.2018.06.003

Preparation of and Study on a High Temperature Filter Loss Reducer

doi: 10.3969/j.issn.1001-5620.2018.06.003
  • Received Date: 2018-09-29
  • Publish Date: 2018-11-30
  • Drilling fluids for deep well drilling should have the ability to resist the negative effects of high temperatures and salt and calcium contamination. A new drilling fluid filter loss reducer, PAANS, has been developed to satisfy the needs as mentioned above. PAANS was synthesized through enzymatic reaction, with monomers such as 2-acrylamide-2-methylpropane sulfonic acid (AMPS), acrylamide (AA), N-vinyl pyrrolidone (NVP) and sodium 4-hydroxybenzenesulfonate (SHBS). Catalyst used in the reaction was horseradish peroxidase (HRP). PAANS has benzene ring in its molecules. Another reference polymer, PAAN was also synthesized at the same reaction conditions, with no benzene ring in its molecules. The molecular structure of the two polymers was characterized with 1H NMR. Rheology and filtration test results showed that, the properties of a drilling fluid sample treated with 2.0% PAANS and aged at 220℃ for 16 h, were as follows:apparent viscosity=16.5 mPa·s, plastic viscosity=10.5 mPa·s, yield point=6.0 Pa, API filtration rate=12.4 mL, and HTHP filtration rate=24.0 mL. The PAANS treated drilling fluid had the ability to resist salt contamination to saturation and calcium contamination to some extent. Obviously, the performance of the PAANS treated drilling fluid is superior to the performance of the PAAN treated drilling fluid. Experiments on adsorption capacity and particle size distribution of PAANS, and mud cake microstructure have revealed that the mechanisms of filter loss control by PAANS is because there are benzene rings distributed on the molecular backbones of PAANS, thereby forming a rigid molecular structure.

     

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