Drilling practice Zhongzihao gas exploration well in the thrust belt of the western margin

The geological structure of Zhong-7 well and Zhong-14 is the Hengshanpu section thrust belt in western margin Ordos Basin, there have been few construction wells this area past two years. During wells, formation stability entire was extremely poor, especially Shiqianfeng. following strata collapsed seriously frequently encountered blockages during tripping. construction, measures such as optimizing system, enhancing plugging, improving suppression, wall patching complex sections, fiber cleaning were adopted to obtain valuable experience for later Zhongzi gas exploration margin.