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钻完井液对X油田疏松砂岩储层损害及保护

Damage and Protection of Unconsolidated Sandstone Reservoirs in X Oilfield Caused by Drilling and Completion Fluids

Environment and Resource / 2026,8(1): 48-60 / 2026-03-06 16 10

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• Authors: 祝小杰 唐洪明
• Information:

  西南石油大学地球科学与技术学院，成都

• Keywords:
  Pearl River Mouth Basin; Unconsolidated sandstone; Reservoir damage; Reservoir protection
  珠江口盆地; 疏松砂岩; 储层损害; 储层保护
• Abstract: The H0 formation of X Oilfield is an unconsolidated sandstone reservoir, During drilling and completion operations, it is highly susceptible to solid-phase invasion, which disrupts the original mechanical and chemical equilibrium of the reservoir, thereby triggering severe reservoir damage and restricting reservoir development benefits. To address this technical challenge, this paper conducts dynamic filtration experiments of drilling and completion fluids. By simulating the drilling and completion processes, the paper systematically evaluates the influence laws of reservoir physical properties and circulation time on the degree of reservoir damage under the action of existing drilling and completion fluid systems. Based on the experimental results, it further systematically analyzes the damage mechanism of drilling and completion fluid systems on such reservoirs in X Oilfield, and completes the optimal screening of drilling and completion fluid concentration and bridging particle ratio. The experimental results show that: reservoirs with better physical properties suffer relatively less damage; with the extension of circulation time, the invasion depth of drilling fluid and the reservoir damage rate increase continuously; the damage rate of the optimized drilling and completion fluid system to the reservoir is controlled within the range of 5.0%–11.4%, and it presents the characteristic that the lower the permeability, the better the damage control effect. The research results can provide important theoretical support for the efficient development of medium-porosity and medium-permeability unconsolidated sandstone reservoirs. X油田H0层为疏松砂岩储层，在钻完井作业过程中极易发生固相侵入，破坏储层原始力学与化学平衡，进而引发严重的储层损害，制约油藏开发效益。针对这一技术难题，本文开展钻完井液动态滤失实验，通过模拟钻完井过程，系统评价现有钻完井液体系作用下，储层物性与循环时间对储层损害程度的影响规律。基于实验结果，进一步系统剖析钻完井液体系对X油田该类储层的损害机理，完成钻完井液浓度及暂堵颗粒配比的优化筛选。实验结果显示：物性更优的储层受损害程度相对较轻；随循环时间延长，钻井液侵入深度和储层损害率持续增加；优化后的钻完井液体系对储层的损害率控制在5.0%～11.4%，且呈现出渗透率越低、损害控制效果越好的特征。本研究成果可为中孔中渗疏松砂岩油藏的高效开发提供理论支撑。
• DOI: https://doi.org/10.35534/er.0801006 (registering DOI)
• Cite: 祝小杰，唐洪明．钻完井液对X油田疏松砂岩储层损害及保护［J］．环境与资源，2026，8（1）：48-60.