“Component flow”conditions and its effects on enhancing production of continental medium-to-high maturity shale oil  

作　　者：ZHAO Wenzhi BIAN Congsheng LI Yongxin LIU Wei QIN Bing PU Xiugang JIANG Jianlin LIU Shiju GUAN Ming DONG Jin SHEN Yutan 

机构地区：[1]Research Institute of Petroleum Exploration and Development,Beijing 100083,China [2]ZWZ Academician Research Studio,Research Institute of Petroleum Exploration and Development,Beijing 100083,China [3]Sinopec Research Institute of Petroleum Processing,Beijing 100083,China [4]Exploration and Development Research Institute of PetroChina Dagang Oilfield Company,Tianjin 300280,China

出　　处：《Petroleum Exploration and Development》2024年第4期826-838,共13页石油勘探与开发（英文版）

基　　金：Supported by the National Natural Science Foundation of China(U22B6004);Scientific Research and Technological Development Project of RIPED(2022yjcq03);Technology Research Project of PetroChina Changqing Oilfield Company(KJZX2023-01)。

摘　　要：Based on the production curves,changes in hydrocarbon composition and quantities over time,and production systems from key trial production wells in lacustrine shale oil areas in China,fine fraction cutting experiments and molecular dynamics numerical simulations were conducted to investigate the effects of changes in shale oil composition on macroscopic fluidity.The concept of“component flow”for shale oil was proposed,and the formation mechanism and conditions of component flow were discussed.The research reveals findings in four aspects.First,a miscible state of light,medium and heavy hydrocarbons form within micropores/nanopores of underground shale according to similarity and intermiscibility principles,which make components with poor fluidity suspended as molecular aggregates in light and medium hydrocarbon solvents,such as heavy hydrocarbons,thereby decreasing shale oil viscosity and enhancing fluidity and outflows.Second,small-molecule aromatic hydrocarbons act as carriers for component flow,and the higher the content of gaseous and light hydrocarbons,the more conducive it is to inhibit the formation of larger aggregates of heavy components such as resin and asphalt,thus increasing their plastic deformation ability and bringing about better component flow efficiency.Third,higher formation temperatures reduce the viscosity of heavy hydrocarbon components,such as wax,thereby improving their fluidity.Fourth,preservation conditions,formation energy,and production system play important roles in controlling the content of light hydrocarbon components,outflow rate,and forming stable“component flow”,which are crucial factors for the optimal compatibility and maximum flow rate of multi-component hydrocarbons in shale oil.The component flow of underground shale oil is significant for improving single-well production and the cumulative ultimate recovery of shale oil.

关 键 词：continental facies pure shale type shale oil medium-to-high maturity shale oil micro-nanopores multi-component hydrocarbons component flow similarity and intermiscibility molecular aggregate 

分 类 号：TE357[石油与天然气工程—油气田开发工程]