Laboratory Study on Static Sedimentation Stability of High-Density Drilling Fluids at High Temperatures
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摘要: 高温高密度钻井液的沉降稳定性对钻井液性能稳定和井控安全都至关重要。采用低剪切应力及低振荡频率对钻井液胶液进行小幅度原位振荡的方法,考察了在不破坏胶体缔合结构的状态下高密度钻井液组分在胶液中的黏弹性响应,分析了静置条件下胶液中处理剂间的作用及重晶石在钻井液胶液中所处的应力环境。实验结果表明,钻井液中的共聚物、磺化材料、膨润土等通过疏水缔合、桥接作用形成具有柔性网架的弱胶凝结构,高密度钻井液胶液主要表现为黏性特征。表明高温下高密度钻井液胶液中黏土-磺化材料-共聚物中组分相互作用,减小了重晶石沉降速度,提高了重晶石的沉降稳定性能。Abstract: The sedimentation stability of a high temperature high density drilling fluid plays a key role in stabilizing the property of the drilling fluid and in the safety of well control. Using small amplitude in-situ oscillation method, in which low shearing stress and low frequency oscillation were applied to a high density drilling fluid, the viscoelastic response of the drilling fluid constituents in gel solution was observed under the condition that the associative structure of the drilling fluid was not broken down, and analyses were performed on the interaction among the additives in the drilling fluid at rest and the effect of the stress environment on the barite in the drilling fluid. Experimental results showed that drilling fluid additives, such as copolymers, sulfonates and bentonite, can develop a weak gel structure with flexible network among them through hydrophobic association and bridging. The gel solution of the highdensity drilling fluid generally exhibits viscous characteristics. indicating that interaction among clay, sulfonate and copolymer in a high-density drilling fluid at elevated temperatures effectively hinders the sedimentation of barite, thereby improving the sedimentation stability of barite.
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