清洁转向酸酸压技术在塔河油田的应用

Application of acid fracturing technology with visco-elastic surfactant acid in Tahe Oilfield

艾昆 李谦定 袁志平 赵立宁 潘翠萍

AI Kun LI Qianding YUAN Zhiping ZHAO Lining PAN Cuiping

西安石油大学，陕西西安　710065 华北石油局井下作业大队，河南郑州　450042 徐州管道储运公司，江苏徐州　221008 华北油田公司采油工艺研究院，河北任丘　062552

Xi’an Petroleum University, Xi’an 710065, China Downhole Operation Team of Sinopec Huabei Oil Burea, Zhengzhou 450042, China Xuzhou Pipeline Storage & Transport Corp.,Xuzhou 221008,China

塔河油田3号区块奥陶系储层在酸压过程中缝高较发育，沟通下部水体后造成含水上升快且后期快速水淹。为了改善非均质储层酸压效果，同时控制压后产水，开发了清洁转向酸复合酸压技术。酸液中的黏弹性表面活性剂与盐类化合物接触时能形成非常高的黏度，而与烃类物质接触时会降解，黏度降低，易于返排，不仅具有自转向作用，且具有布酸控水功能。该技术在TK332井获得了成功应用，措施完成后初产油30m3/d，产气1.9×104 m3/d，且压后不产水。施工时发现，转向酸不适合高排量作业，排量控制在2～3 m3/min时布酸控水效果更明显。该技术的成功应用，为以后同类井施工提供了较好的借鉴。

During the acid fracturing in Ordovician reservoir in No.3 block of Tahe Oilfield, fracture height grew to connect lower water zone resulting in rapid watercut growth and waterflood breakthrough during later production. To improve acid fracturing effect and control water production after fracturing, visco-elastic surfactant acid technology was developed. When the visco-elastic surfactant in acid contacts with salt compound, very high viscosity can be obtained; but when contacts with hydrocarbons, viscosity will reduce due to degradation, which is beneficial to flow back. This acid is featured by automatic diverting and water control function, which was applied in well TK332 successfully, with early oil production of 30 m3/d, gas rate of 1.9×104 m3/d and no water production after stimulation. It is found that diverting acid is not suitable for high displacement operation and displacement at ~3 m3/min is better. Successful application of the technology provides good reference for similar operation.