For serious formation leakage, the working fluid can't carry sand column to ground surface in the process of sand washing.
由于地层漏失严重，作业冲砂施工过程中工作液无法将井筒内的砂柱携出地面。
2
Through continuous automatical adjustion of the paragraphs fluid volume, ground sand concentration, proppant type and size and so on, the software finally designs fracturing process.