应用数值模拟研究神狐海域水合物第一次试采数据  

Numerical Simulation for Data Analyses of First Gas Hydrate Trial Production Test in Shenhu Area

作　　者：崔伟[1] 肖加奇 Cui Wei;Xiao Jiaqi(Academy of Advanced Interdisciplinary Studies,Qilu University of Technology(Shandong Academy of Sciences),Ji’nan 250353,China)

机构地区：[1]齐鲁工业大学(山东省科学院)前沿交叉学科研究院,山东济南250353

出　　处：《地球科学》2022年第5期1890-1900,共11页Earth Science

摘　　要：2017年神狐海域第一次试开采成功后,许多学者应用数值模拟对试采数据进行研究,但模拟结果与实际试采数据存在偏差.为了探求原因,本研究建立了二维柱坐标系下水合物降压开采数学模型,开发了相应的程序,能够模拟渗透率等储层参数非均匀分布条件下开采过程,同时能够模拟开采井压力等动态参数对开采过程的影响.通过数值实验,得出偏差原因:(1)泥质粉砂型储层存在水敏性,水合物分解产生的淡水引起粘土膨胀,使渗透率下降;(2)须将开采井压力作为动态输入参量.据此,修正了渗透率模型,考虑了开采井压力随时间的变化,得到的模拟产气量与试采数据十分接近,使降压开采数值模拟更逼近实际情况.After the first successful trial production in the Shenhu area of the South China Sea in 2017, many scholars have used numerical methods to simulate this process, but the simulation results have always been deviated from the data of actual trial production. In order to explore the reasons for the deviation, a mathematical model is established for depressurization discovery in a two-dimensional cylindrical coordinate system, and a corresponding program is developed in this study, to simulate not only the non-uniform distribution of reservoir parameters such as permeability and so on, but also the impact of dynamic parameter such as the wellbore pressure on the production process. Making full use of the flexibility of the autonomous program, the reasons for the deviation are obtained through numerical experiment analysis:(1) The muddy silt-type reservoir has water sensitivity, and the fresh water produced by the decomposition of hydrate causes clay swelling, which makes the permeability decrease;(2) The production well pressure must be taken as the dynamic input parameter. Based on this, the permeability model was revised, and the timevarying pressure in production well was dynamically input. The simulated gas production obtained is very close to the trial production data, making the numerical simulation of depressurization closer to the actual situation.

关 键 词：天然气水合物 神狐海域 偏差 渗透率 开采井压力 数值模拟 油气地质 

分 类 号：P631[天文地球—地质矿产勘探]