In the straight hole,the complex metallic ion polymer drilling fluid system was used.The drilling fluid filtrate was controlled well,and the formation hydrating and swelling were prevented.

• 该井直井段采用复合金属离子聚合物钻井液体系,较好地控制了钻井液滤失量,减少了滤液渗入地层,防止了地层水化膨胀。