非常规气藏对新型纳米排驱剂的吸附实验研究  

Experimental study on adsorption of new nano-displacement agentfor unconventional gas reservoirs

作　　者：杨笑 雷奕 王润平 汪杰[3] 张丽华 YANG Xiao;LEI Yi;WANG Runping;WANG Jie;ZHANG Lihua(Jianghan Petroleum Engineering Co.,Ltd.,SINOPEC,Wuhan 430200,Hubei;The Fourth Drilling Engineering Branch,Bohai Drilling Engineering Company Limited,CNPC,Cangzhou 061000,Hebei;School of Petroleum Engineering,Yangtze University,Wuhan 430100,Hubei;Research Institute of Exploration and Development,Huabei Oilfield Company,PetroChina,Renqiu 062550,Hebei)

机构地区：[1]中石化江汉石油工程公司,湖北武汉430200 [2]中国石油集团渤海钻探工程有限公司第四钻井工程分公司,河北沧州061000 [3]长江大学石油工程学院,湖北武汉430100 [4]中国石油华北油田分公司勘探开发研究院,河北任丘062550

出　　处：《长江大学学报（自然科学版）》2023年第3期128-134,共7页Journal of Yangtze University(Natural Science Edition)

基　　金：非常规油气省部共建协同创新中心(长江大学)开放基金项目“页岩气藏水相自吸微裂缝发育与水锁损害机理研究”(UOG202016)。

摘　　要：纳米排驱剂能够有效提高非常规气藏压裂液渗吸后的返排效率,提高裂缝表面气体渗透率,增大采气量,避免出现“液相圈闭”。而纳米排驱剂在岩石颗粒表面作用的长效性和向地层深部的运移能力决定了其能否有效发挥作用。研发了一种新型的纳米排驱剂CNDAD1#,并对纳米排驱剂的性能进行实验研究。由于纳米颗粒对紫外可见吸收光谱的吸收作用,利用紫外分光光度计对纳米排驱剂在不同类型岩粉条件下设计的动静态吸附实验,对纳米排驱剂的作用长效性和深部运移能力进行定量和定性评价。结果表明:页岩、煤岩、碳酸盐岩、砂岩对新型纳米排驱剂均具有较好的吸附效果,吸附效果强弱依次为页岩>煤岩>碳酸盐岩>砂岩;静态吸附实验中岩粉目数越大,吸附速率越快、吸附量越大;动态吸附实验中的陶粒支撑剂对化学剂的吸附量较低,不会影响化学剂向裂缝深部运移的有效含量,达到动态吸附平衡的注入量为3~5 PV,当注入量继续上升时岩粉对化学剂仍具有较强的吸附能力,从而达到化学剂随注入液向裂缝深部运移、改善地层深部开发的效果。结果对非常规气藏压裂开采具有重要指导意义。Nano-displacement agent can effectively improve the flowback efficiency of fracturing fluid after imbibition in unconventional gas reservoirs,improve the gas permeability of fracture surface,increase the gas production,and avoid“liquid phase trap”.However,the long-term effect of nano-displacement agent on the surface of rock particles and its migration ability to the deep stratum determine whether it can effectively play its role.Therefore,a new nano-displacement agent CNDAD1#was developed in this paper,and its performance was experimentally studied.Due to the absorption effect of nanoparticles on the ultraviolet visible absorption spectrum,the dynamic and static adsorption experiments of nano-displacement agent designed under different types of rock powder conditions were conducted using ultraviolet spectrophotometer to quantitatively and qualitatively evaluate the long-term effect and deep migration capacity of the nano-displacement agent.The results show that shale,coal rock,carbonate rock and sandstone all have good adsorption effect on the new nano-displacement agent,and the adsorption effect is in the order of shale>coal rock>carbonate rock>sandstone;In the static adsorption experiment,the larger the mesh number of rock powder is,the faster the adsorption rate and the larger the adsorption capacity are;The ceramsite proppant in the dynamic adsorption experiment has a low adsorption capacity for the chemical agent,which will not affect the effective content of the chemical agent moving to the deep part of the fracture.The injection amount to achieve the dynamic adsorption balance is 3~5 PV.When the injection amount continues to rise,the rock powder still has a strong adsorption capacity for the chemical agent,so as to achieve the effect of the chemical agent moving to the deep part of the fracture with the injection fluid and improving the deep development of the formation.The results have important guiding significance for fracturing production of unconventional gas reservoirs.

关 键 词：非常规气藏 纳米排驱剂 吸附性能 吸光度 

分 类 号：TE357[石油与天然气工程—油气田开发工程]