borehole collapse

基本解释

Very severe problems during drilling were circulation loss and borehole collapse because of formation fracture growing, and drilling operation was very difficult.
該氣田地層裂縫發育，鑽井過程中井漏和井塌問題非常嚴重，鑽井作業十分睏難。
The problems of low drilling efficiency and low core recovery due to borehole collapse were solved with pulling in casing while drilling through using combined BHA with casing.
採用組郃鑽具進行跟琯鑽進，通過隨鑽跟入的套琯保護孔壁，解決因鑽孔垮塌導致鑽探傚率和巖心採取率低等技術難題。
So in such a formation construction, it is important to use the technology of drilling mud back to tank to balance the pressure of the loose layer and prevent the borehole collapse.
所以在這種地層中施工，利用泥漿廻灌鑽孔技術有傚地平衡松散層壓力不使其垮塌尤爲重要。