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Screening of Clay Stabilizer Composition for Water Injection Wells of Zhangdian Oilfield

Qi Baoliang Wang Ning Si Yumei (Henang Petroleum Exploration Bureau,Nanyang 473132)  
Zhangdian Oilfield belongs to high water sensitive fo rmation,so it is very important to inject clay stabilizers into formation during water injection to prevent clay from expanding.The tests using a series of clay stabilizers on clay expanding and core flowing showed that the most suitable cl ay stabilizer composition for water injection wells in Zhangdian Oilfield was 2% JJA+2%NH 4Cl. After treating the cores using this composition and injecting 50 PV water of Zhangdian,the retention of permeability could reach 94.74%.
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