The Drilling Fluid Technology about Chengbei 326 A-7 Extended Reach Well
The upper part of the Chengbei 326 A-7 well has a large sedimentary section of easily hydrated mudstone,while the Shahejie Formation develops oil mudstone and oil shale.The pressure coefficient of the Paleozoic formation is low,and during the directional process of the nearly 5 000 meter inclined well section,rock debris is prone to settle on the lower wellbore wall,forming a rock debris bed.The stability of the drilling fluid wellbore wall,the difficulty of wellbore purification,and lubrication anti jamming technology during directional construction are significant.By using a low activity polyamine solid wall anti collapse drilling fluid system and a seawater solid-free lubrication anti collapse drilling fluid system,corresponding on-site drilling fluid maintenance and treatment processes were assisted.During construction,the wellbore was stable,the wellbore was well purified,and the orientation was smooth.The average mechanical drilling speed of the entire well was 24.86 m/h,achieving good results in fast drilling.
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