基于井下解码器的EGS合采技术  

Study on EGS co-mining technology based on downhole decoder

作　　者：张彦廷[1] 黄峥 张晧 徐敬玉 王林 綦耀光[1] 袁翔 于杨杨 ZHANG Yanting;HUANG Zheng;ZHANG Hao;XU Jingyu;WANG Lin;QI Yaoguang;YUAN Xiang;YU Yangyang(School of Mechanical and Electrical Engineering in China University of Petroleum (East China),Qingdao 266580,China;Shanghai Haomu Energy Saving Technology Company Limited, Shanghai 200335, China;Henan University of Science and Technology, Luoyang 471003, China)

机构地区：[1]中国石油大学(华东)机电工程学院,山东青岛266580 [2]上海昊姆节能科技有限公司,上海200335 [3]河南科技大学土木工程学院,河南洛阳471003

出　　处：《中国石油大学学报（自然科学版）》2021年第3期111-117,共7页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家重点研发计划(2017YFC0804502);国家自然科学基金项目(51804333);研究生创新工程项目(YCX2019064)。

摘　　要：增强型地热系统(EGS)多层合采技术中,由于各储层进井压力差异显著,同井筒多储层合采作业中依然会出现较大的层间干扰现象,导致热产量较低且无法精确控制。以构造低产量多层位换热层合采作业为基础,结合井下解码器技术设计三管线控制六层位的EGS优化合采模型,通过管线与译码组合设计实现控制工质入流面积与压力来解决层间干扰与产量优化问题。结果表明利用解码器技术控制第二层滑套,工质总产量达到最大值为977 m^(3)/d,相对于无解码器工况下提高5.2%,通过该技术控制层位流量进行工质合采,可保证工质采收产量,同时可以避免由于单层流量大造成层间干扰等问题。In the multi-layer combined production technology of enhanced geothermal system,due to the significant difference of inlet pressure of each reservoir,the large interlayer interference still occurs during the combined production of multi-reservoirs in the same wellbore,which leads to the result that the thermal output is low and cannot be accurately controlled.Based on the combined production of the multi-level heat exchange layer with low yield,in combination with the optimized EGS co-production model for the downhole decoder with three pipelines controlling six layers,the inflow area and pressure of the working fluid were controlled through the combined design of pipeline and decoding,in order to solve the problems of interlayer interference and output optimization.The results show that utilizing the decoder technology to control the second layer sliding sleeve,the total output of working fluid reaches the maximum value of 977 m^(3)/d,which is 5.2%higher than that without decoder.This shows that the technology can control the flow rate of layers to combine working fluid and ensure the production of working fluid,while avoiding the interlayer flow caused by the large single layer flow.

关 键 词：增强型地热系统 井下解码器 层间干扰 产量优化 低产量控制合采 

分 类 号：TK523[动力工程及工程热物理—热能工程]