基于超分子原理,研制了用于油基钻井液的提切剂CFZTQ-1,以此为核心开发了新型高密度无黏土油基钻井液体系,并对其进行了性能评价和现场应用。研究表明CFZTQ-1在水相中缔合形成的超分子结构显著增加了反相乳液的弹性,提切效果与助悬浮性能均优于国外几种同类提切剂,且CFZTQ-1与有机土之间存在协同增效作用,同时适用于常规含土油包水钻井液。通过对相关处理剂的优选与加量优化,确定了高密度无黏土油基钻井液体系的配方,对其进行了基本性能评价,结果表明：体系密度在2.20~2.60 g/cm3,动切力在13~17 Pa,且表观黏度适中,塑性黏度不高,流变性能良好;体系在240 ℃高温热滚后黏度涨幅不大,高温高压滤失量在10 mL左右,破乳电压大于400 V,性能稳定。体系现场应用效果良好。图7表6参13
蒋官澄
,
贺垠博
,
黄贤斌
,
邓正强
,
覃勇
. 基于超分子技术的高密度无黏土油基钻井液体系[J]. 石油勘探与开发, 2016
, 43(1)
: 131
-135
.
DOI: 10.11698/PED.2016.01.17
Based on supramolecular chemistry, a rheology modifier CFZTQ-1 for oil base drilling fluids was developed, and an innovative high-density organoclay-free oil base drilling fluid system centering on CFZTQ-1 was designed, evaluated and applied in the field. CFZTQ-1 can strongly increase the elasticity of invert emulsion due to the supramolecular structure assembled in water phase; CFZTQ-1 has stronger effect in elevating the yield point and suspension ability than several foreign rheology modifiers; the synergistic effect with organoclay also makes CFZTQ-1 available in traditional clay-contained invert emulsion drilling fluids. Through the category and dosage optimization of related additives, the formula of the high-density organoclay-free oil base drilling fluid was established and its performance was evaluated. The organoclay-free drilling fluid owns favorable rheology with density of 2.40-2.60 g/cm3, yield point of 13-17 Pa, moderate apparent viscosity and relative low plastic viscosity; after hot rolling at 240 ℃, the drilling fluid still keeps a stable performance as its viscosity only increases slightly, its high temperature and high pressure (HTHP) filtration loss is about 10 mL and its electrical stability is greater than 400 V. This innovative drilling fluid system achieves excellent field application as well.
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