基于结构稳定剂的支撑剂高效铺置技术  

Efficient placement technology of proppants based on structural stabilizers

作　　者：郭建春[1] 任山 张绍彬 刁素 卢杨 张涛[1] GUO Jianchun;REN Shan;ZHANG Shaobin;DIAO Su;LU Yang;ZHANG Tao(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;Chengdu LEPS Technology Co.,Ltd.,Chengdu 610000,China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,成都610500 [2]成都劳恩普斯科技有限公司,成都610000

出　　处：《石油勘探与开发》2024年第3期616-623,共8页Petroleum Exploration and Development

摘　　要：针对纤维在常规滑溜水中逸出量较高,难以与支撑剂形成纤维-支撑剂簇、作用效果有限等问题,开发出一种结构稳定剂,基于微观结构观察和性能评价室内实验,分析结构稳定剂作用下支撑剂的铺置机理及结构稳定剂对支撑剂铺置规模、裂缝导流能力等的影响。研究表明:结构稳定剂与聚合物、纤维、石英砂之间可形成稳定的纤维-支撑剂团簇,与单纯支撑剂相比,密度降低,体积增大,沉降过程中与液体的接触面积增大,浮力与曳力增加,沉降速度变缓,更易被流体携带进裂缝深处。将纤维及结构稳定剂随支撑剂一起泵入储层可降低纤维逸出率、增加支撑剂在滑溜水中占据的体积,大幅提高支撑剂铺置高度、输送距离及裂缝导流能力,降低支撑剂返排率。实验结果表明,结构稳定剂最佳质量分数为0.3%。致密气、页岩油、页岩气80井次的应用效果证实,结构稳定剂具有较好的适应性,基本能满足该类油气井的提产、降本和防砂需求。Fiber is highly escapable in conventional slickwater,making it difficult to form fiber-proppant agglomerate with propppant and exhibit limited effectiveness.To solve these problems,a novel structure stabilizer(SS)is developed.Through microscopic structural observations and performance evaluations in indoor experiments,the mechanism of proppant placement under the action of the SS and the effects of the SS on proppant placement dimensions and fracture conductivity were elucidated.The SS facilitates the formation of robust fiber-proppant agglomerates by polymer,fiber,and quartz sand.Compared to bare proppants,these agglomerates exhibit reduced density,increased volume,and enlarged contact area with the fluid during settlement,leading to heightened buoyancy and drag forces,ultimately resulting in slower settling velocities and enhanced transportability into deeper regions of the fracture.Co-injecting the fiber and the SS alongside the proppant into the reservoir effectively reduces the fiber escape rate,increases the proppant volume in the slickwater,and boosts the proppant placement height,conveyance distance and fracture conductivity,while also decreasing the proppant backflow.Experimental results indicate an optimal SS mass fraction of 0.3%.The application of this SS in over 80 wells targeting tight gas,shale oil,and shale gas reservoirs has substantiated its strong adaptability and general suitability for meeting the production enhancement,cost reduction,and sand control requirements of such wells.

关 键 词：水力压裂 支撑剂 结构稳定剂 铺置机理 导流能力 支撑剂返排率 

分 类 号：TE355[石油与天然气工程—油气田开发工程]