摘要
为了研究金属滤网类挡砂介质的冲蚀破坏机理、主要控制因素及其影响规律,基于复合完井筛管中的多层金属滤网挡砂介质,开展了系统的冲蚀模拟试验。研究结果表明:多层金属滤网的冲蚀破坏机理包括正面的啃噬点蚀机理和侧向切削冲蚀机理,冲蚀初期以正面啃噬为主、侧向切削为辅,孔洞形成后转变为侧向切削为主;金属网布冲蚀速率随冲蚀介质流速呈非线性升高,随地层砂粒径中值和含砂体积分数呈线性升高;高精度介质小角度冲蚀速率高于正面冲蚀,而中低精度介质冲蚀速率在40°~60°时最高,正面及小角度时均相对较低;提出的多层滤网挡砂介质冲蚀速率预测模型拟合精度较高,模型考虑了外界冲蚀条件和滤网结构特征,气体携砂与液体携砂时模型的拟合系数分别为0.898 7和0.908 9。所得结论可为多层金属滤网复合筛管的滤网介质冲蚀破坏预测提供参考。
In order to clarify the mechanism, main controlling factors and influence law of the erosion damage of the metal screen sand-retaining medium, the multi-layer metal screen sand-retaining medium in the composite completion screen pipe was selected for a systematic erosion damage test to analyze how the erosion rate is affected. The results show that the erosion damage mechanism of the multi-layer metal screen includes the frontal gnawing pitting mechanism and the lateral cutting erosion mechanism, and frontal gnawing is dominant and lateral cutting is supplemental in the early stage of erosion, while lateral cutting becomes dominant after the formation of holes. The erosion rate of the metal screen increases nonlinearly with the flow rate of the medium, and linearly with the sand size and sand volume fraction. The erosion rate of high-precision medium is higher at small angles than at front, while the erosion rate of medium-to low-precision media is the highest at 40°~60°, and relatively low at front and small angle. The proposed erosion rate prediction model of multi-layer metal screen sand-retaining medium has a high fitting accuracy, and considers the external erosion conditions and the structural characteristics of the screen, and the fitting coefficient of the model with sand-carrying gas and liquid is 0.898 7 and 0.908 9, respectively. The conclusions can provide a reference for predicting the medium erosion damage of a composite screen pipe with multi-layer metal screen.
作者
董长银
刘晨枫
周博
甘凌云
陈刚
魏庆彩
孟召兰
Dong Changyin;Liu Chenfeng;Zhou Bo;Gan Lingyun;Chen Gang;Wei Qingcai;Meng Zhaolan(School of Petroleum Engineering,China University of Petroleum(East China);Research Institute of Petroleum Engineering,Sinopec Shengli Oilfield;CNOOC EnerTech-Drilling&Production Co.)
出处
《石油机械》
北大核心
2022年第4期86-93,共8页
China Petroleum Machinery
基金
国家自然科学基金项目“非均质疏松砂岩储层水平井砂液(水)协同产出剖面动态演化机制及模拟”(52074331)
中石化重大示范工程科技攻关项目“低效水平井长效防砂技术研究与应用”(P19005-2)
中海油能源发展股份有限公司攻关项目“海上油气田钻完井工具冲蚀检测与评估研究”(GCJSXMHT-1706)。
关键词
复合筛管
多层金属滤网
挡砂介质
冲蚀速率
携砂
预测模型
破坏机理
composite screen pipe
multi-layer metal screen
sand-retaining medium
erosion rate
sand carrying
prediction model
erosion damage mechanism
