Synthesis and Evaluation of a Low Viscosity Gelling Agent for Water Base Drilling Fluids
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摘要: 为了实现在调控钻井液黏度的情况下获得良好的携岩能力，以丙烯酰胺（AM）、2-丙烯酰胺基-2-甲基丙磺酸（AMPS）、二甲基二烯丙基氯化铵（DMDAAC）、甲基丙烯酰氧乙基-N，N-二甲基丙磺酸（DMAPS）和十六烷基疏水单体（C16-D）为原料，采用自由基聚合法，制备了一种新型的两性疏水缔合聚合物（PAADDC）。采用傅里叶变换红外光谱（FTIR）和核磁共振（1H NMR）表征了PAADDC的分子结构，采用静态光散射（SLS）测定了聚合物的分子量，并对其流变性能进行了评价。结果表明，100℃老化16 h，加量为0.2% PAADDC的钻井液的表观黏度、塑性黏度、动切力和动塑比分别为18.5 mPa·s，11.5 mPa·s，7.0 Pa和0.61 Pa/mPa·s，抗温可达160℃。与常规增黏剂相比，PAADDC具有良好的热稳定性和更佳的抑黏增切效果。在60～180℃热老化实验中，动塑比值随PAADDC用量的增加而降低。环境扫描电镜（ESEM）和原子力显微镜（AFM）的观察表明，PAADDC在溶液中形成了连续的三维网状结构，这是其剪切强度显著提高的主要原因。Abstract: 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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Key words:
- Water base drilling fluid /
- Gelling agent /
- Rheological performance
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[1] HAMED S B, BELHADRI M. Rheological properties of biopolymers drilling fluids[J]. Journal of Petroleum Science and Engineering, 2009, 67(3-4):84-90. [2] HUANG X, JIANG G, HE Y, et al. Improvement of rheological properties of invert drilling fluids by enhancing interactions of water droplets using hydrogen bonding linker[J]. Colloids and Surfaces A:Physicochemical and Engineering Aspects, 2016, 506:467-475. [3] ENGEL S P, RAE P. New methods for sand cleanout in deviated wellbores using small diameter coiled tubing[C]//IADC/SPE Asia Pacific Drilling Technology. Society of Petroleum Engineers, 2002. [4] MOHAMMADI M, KOUHI M, SARRAFI A, et al. Studying rheological behavior of nanoclay as oil well drilling fluid[J]. Research on Chemical Intermediates, 2015, 41(5):2823-2831. [5] KHALIL M, MOHAMED JAN B. Herschel-bulkley rheological parameters of a novel environmentally friendly lightweight biopolymer drilling fluid from xanthan gum and starch[J]. Journal of Applied Polymer Science, 2012, 124(1):595-606. [6] BARRY M M, JUNG Y, LEE J K, et al. Fluid filtration and rheological properties of nanoparticle additive and intercalated clay hybrid bentonite drilling fluids[J]. Journal of Petroleum Science and Engineering, 2015, 127:338-346. [7] SONG K, WU Q, LI M C, et al. Performance of low solid bentonite drilling fluids modified by cellulose nanoparticles[J]. Journal of Natural Gas Science and Engineering, 2016, 34:1403-1411. [8] PATEL A D. Design and development of quaternary amine compounds:shale inhibition with improved environmental profile[C]//SPE International Symposium on Oilfield Chemistry. Society of Petroleum Engineers, 2009. [9] MORTIMER D A. Synthetic polyelectrolytes-a review[J]. Polymer International, 1991, 25(1):29-41. [10] LIM S N, KHALIL M, JAN B M, et al. Lightweight biopolymer drilling fluid for underbalanced drilling:An optimization study[J]. Journal of Petroleum Science and Engineering, 2015, 129:178-188. [11] BARTHEL H K F. Viscosifier for oil base drilling fluids:U.S. Patent 4,481,121[P]. 1984-11-6. -
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