borehole collapse

基本解釋

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(fā)育，鉆井過程中井漏和井塌問題非常嚴(yán)重，鉆井作業(yè)十分困難。
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.
采用組合鉆具進行跟管鉆進，通過隨鉆跟入的套管保護孔壁，解決因鉆孔垮塌導(dǎo)致鉆探效率和巖心采取率低等技術(shù)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，利用泥漿回灌鉆孔技術(shù)有效地平衡松散層壓力不使其垮塌尤為重要。