More than 200 of formation tests(or the third open to swab)and conventional oil testing to these formations have been done during over ten years of practice in Huabei oilfield, Jizhong region.

• 华北油田冀中地区在十几年实践过程中,陆续开展了200多层次地层测试(或三开抽汲)及该试油层常规抽汲试油工作。