摘要
为研究体积压裂过程中支撑剂在复杂缝网中的沉降运移规律,以离散化缝网模型为基础,应用复杂缝网模拟实验装置对6种结构缝网进行支撑剂沉降运移规律实验。结果表明:距井筒较近的节点,主裂缝砂堤形态垂直高度上出现"突变"现象,而较远节点,未出现"突变"现象;不同结构缝网,支撑剂在主裂缝中运移距离大小依次为:"一"型结构缝网、"T"型结构缝网、"H"型结构缝网、"TF"型结构缝网、"双T"型结构缝网、"十"型结构缝网;距离井筒较近的次生裂缝中,砂堤形成过程是携砂液携砂作用和支撑剂重力共同作用的结果,而距离较远的次生裂缝中砂堤形成过程中支撑剂的自身重力起主要作用。
For the study on the settlement and migration law of proppant in complex fracture network, a complex fracture network simu-lation experiment device was designed based on discrete model. The settlement and migration laws of proppant in 6 types of complexfracture networks were studied using this experiment device. The experimental results show that, an abrupt change occurred in the sanddike height of the main crack at the nodes near the wellbore, while it would not occurred at the nodes far from the wellbore ; the sortingof the migration distance of proppant in the main fracture of different fracture networks from big to small is ＂ --＂-shaped fracture net-work, ＂T＂ -shaped fracture network,＂ H＂ -shaped fracture network,＂ TF＂ -shaped fracture network,＂ double T＂ -shaped fracture net-work,＂ ＋ ＂-shaped fracture network ; the formation of sand dike in the secondary fractures near the wellbore is the combined action re-sult of the sand carrying effect of fracturing liquid with the gravity of proppant, while the formation of sand dike in the secondary frac-tures far from the wellbore is only due to the action result of the gravity of proppant. The research on the settlement and migration law ofthe proppant in different fracture networks can provide a reference for the construction of the volume fracturing, and it is helpful to im-proving the seepage capability of the fracture network and increasing the output of oil and gas wells.
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2016年第1期79-84,共6页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
山东省自然科学基金"页岩气藏水平井滑溜水压裂支撑剂输送机理研究"(编号:ZR2012EEM001)
中央高校基本科研业务费专项资金资助项目(编号:13CX02051A)
关键词
体积压裂
复杂缝网
缝网形态
支撑剂沉降运移
volume fracturing
complex fracture network
morphology of fracture network
settlement and migration of proppant
