基于喉道分布特征的致密砂岩渗吸模型  

Imbibition Model of Tight Sandstone Based on Distribution Characteristics of Roar

作　　者：李洪 李治平[1,2] 王香增 刘忠华 张甜甜[1,2] LI Hong;LI Zhi-ping;WANG Xiang-zeng;LIU Zhong-hua;ZHANG Tian-tian(Beijing Key Laboratory of Unconventional Natural Gas Geology Evaluation and Development Engineering1 , School of Energy Resources2 , China University of Geosciences （Beijing） , Beijing 100083, China;Research Institute of Shanxi Yanchang Petroleum（GROUP） Co. , Ltd. 3, Xi＇an 710075 ,Chin;School of Petroleum and Natural Gas Engineering, Chongqing University of Science and Technology4 , Chongqing 400042,Chin)

机构地区：[1]中国地质大学(北京)非常规天然气能源地质评价与开发工程北京市重点实验室,北京100083 [2]能源学院,北京100083 [3]陕西延长石油(集团)有限责任公司研究院,西安710075 [4]重庆科技学院石油与天然气工程学院,重庆400042

出　　处：《科学技术与工程》2018年第13期50-54,共5页Science Technology and Engineering

基　　金：北京市自然科学基金(3162026); “十三五”国家科技支撑计划重点项目(2017ZX05009005); 重庆市教委科学技术研究项目(KJ1601320)资助

摘　　要：自发渗吸作用是致密砂岩油藏的重要采油机理,正确理解渗吸机理,充分发挥渗吸作用,对提高致密砂岩油藏的采收率具有重要意义。基于Hagen-Poiseuille方程,根据恒速压汞试验得到的喉道分布百分比与喉道半径的关系,建立了自发渗吸初期,自发渗吸量与渗吸时间的平方根呈线性变化的关系式;并选取长庆油田B418和B456两块岩心进行恒速压汞试验和渗吸试验,两块岩心根据解析模型求得的结果与渗吸试验结果吻合度较高,说明该方法可靠。试验结果同时表明,致密砂岩自发渗吸与喉道半径相关,喉道半径越小,毛细管力也就越大,其渗吸时间也就越长,渗吸量也越大。Spontaneous imbibition is an important oil recovery mechanism to tight sandstone reservoir. It is important to understand its imbibition mechanism and give full play to imbibition to improve the recovery rate of tight sandstone reservoirs. Based on the Hagen-Poiseuille equation,and according to the relationship between throat distribution percentage and throat radius obtained by rate-controlled mercury injection test,the linear relationship between imbibition weight and the square root of imbibition time at the early stage of spontaneous imbibition was established. Two cores（ B418 and B456） of Changqing Oilfield were selected to do rate-controlled mercury injection test and imbibition test,and the imbibition results obtained according to the analytical model were in good agreement with imbibition test results. It shows that the method is correct and reliable. The test results also show that the spontaneous imbibition of tight sandstones is related to the roar radius. The smaller the roar radius is,the bigger capillary force is,so the imbibition time lasts longer,and the imbibition quality is greater.

关 键 词：致密砂岩 恒速压汞 毛细管力 自发渗吸 

分 类 号：TE372[石油与天然气工程—油气田开发工程]