针对砂岩储层聚合物长期堵塞导致采收率低的问题,提出了砂岩储层深穿透复合化学解堵的方法,借助不加砂深穿透压裂,将解堵液输送至储层深部,提高解堵效果。通过油藏数值模拟研究了解堵液沿深穿透裂缝的渗流规律,构建深穿透解堵的产能预测模型,评价深穿透裂缝长度、解堵液用量等因素对解堵效果的影响。研究表明:向地层中注入解堵剂后,解堵剂在波及区域呈哑铃形,改善储层渗透率;随裂缝长度的增加,有效解堵区域逐渐增大;随施工排量的增加,有效解堵区域先增大后减小;裂缝半长和解堵液用量对解堵效果有一定影响,深穿透裂缝半长约为污染带半径的1.4倍时解堵效果最佳。该研究成果可为砂岩储层解堵增产工艺设计提供参考。
To address the issue of low recovery rates due to long-term polymer plugging in sandstone reservoirs,this study proposes a method of deep-penetration composite chemical deplugging for sandstone reservoirs.By leveraging sand-free deep-penetration fracturing,the deplugging fluid was delivered deep into the reservoir to enhance the deplugging effectiveness. The numerical reservoir simulation is employed to investigate the seepage patterns of the deplugging fluid along deep-penetration fractures,and a production prediction model for deep-penetration deplugging is constructed to evaluate the impact of factors such as the length of deep-penetration fractures and the amount of deplugging fluid on the deplugging effect. The study shows that:after the injection of the deplugging agent into the formation,the agent forms a dumbbell-shaped distribution in the affected area,improving the permeability of the reservoir.As the length of the fracture increases,the effective deplugging area gradually enlarges.With the increase in construction flow rate,the effective deplugging area first increases and then decreases.Both the fracture half-length and the amount of deplugging fluid have a certain impact on the deplugging effect,with the optimal deplugging effect achieved when the deep penetration fracture half-length is approximately 1.4 times the radius of the contamination zone.The findings of this study can provide a reference for the design of deplugging and production increase processes in sandstone reservoirs.
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