多轮次蒸汽吞吐井多层覆膜石英砂的研究及应用

Research and application on quartz sands with multilayer leather cover in multi-round steam huff-puff wells

智勤功 李鹏 陈刚 吴琼 武明鸣 张锡娟

ZHI Qingong LI Peng CHEN Gang WU Qiong WU Mingming ZHANG Xijuan

中国石油大学石油工程学院，山东东营　257061 中石化胜利油田分公司采油工艺研究院，山东东营　257000

College of Petroleum Engineering, China University of Petroleum, Dongying 257061, China Petroleum Engineering Technology Research Institute, Shengli Oilfield Branch Company, Dongying 257000, China

稠油油藏多轮次吞吐井采用常规覆膜砂建立的挡砂屏障挡砂效果差，无法满足蒸汽吞吐井一次防砂、多轮注汽要求，因此，针对常规覆膜砂在覆膜工艺（冷法覆膜工艺）、覆膜材料等方面存在的不足，研制了由预固化层、可固化层和惰性层构成的高温多层覆膜支撑剂。同时，根据蒸汽吞吐井的井底温度、湿度环境，建立了湿热法评价系统，对研制的高温多层覆膜支撑剂进行了高温蒸汽老化实验，并与常规高温覆膜砂进行了对比，经过四轮高温蒸汽后，高温多层覆膜支撑剂的胶结强度可达7.1 MPa，渗透率高达87 ?m2，具有较高的固结强度和良好的导流能力。共进行了4口井的现场应用，取得了良好的防砂、增油效果，满足了稠油油藏一次防砂多轮次注汽的要求，具有良好的应用前景。

The poor effect of sand blocking barrier built by conventional coated sand can not satisfied the request of one-time sand control and multi-round steaming in multi-round steam huff-puff wells in heavy reservoirs. Aiming at the shortage of membranes process and materials for conventional coated sand, a high temperature multilayer cover proppant composed by inner pre-solidification layer, middle solidification layer and external protective coating are developed. At the same time, the dampness and heat evaluation system is established on the basis of bottom-hole temperature, moisture of stimulated well. The high temperature steam aging test has been conducted on the developed high temperature multilayer leather proppant, and then the results were compared with that of the common coat sand. After the four round high temperatures steaming, the bonding strength of proppant and permeability has reached to 7.1 MPa and 87 μm2 respectively, which presented a higher solidification strength and well conductivity performance. The trial tests were launched in 4 wells. The favorable sand control and incremental oil effect have satisfied the demand of one-time sand control and multi-round steaming. The High temperature multilayer cover proppant will be found wide application in the future.