New methods for preventing crumbling and collapse of the borehole walls

Purpose. To increase the stability of wellbore during its construction in unstable rocks. Methodology. solve set tasks, an integrated approach is used work, which includes critical analysis and generalization scientific technical achievements combination with theoretical experimental research. Findings. Factors influencing borehole walls conditions prone to rock slides falls are analyzed. Expediency using baths for strengthening wells deposits clay rocks, including shales, has been established substantiated. A formulation a fuel-bituminous bath proposed, installation well 78 hours makes it possible initial compressive strength will ensure integrity walls. It recommended use corrugated casing pipes cover sections where there intensive crumbling collapse Originality. For first time, main factors wall destruction have method developed prevent directional composed rocks loss under action drill string loads. Practical value. combat stability, authors suggested setting up range complications. In case when can not be prevented fuel-bitumen bath, proposed overlap area advanced injection adhesive into mass near-wellbore zone. The material increases contact metal shell rock, collapses increasing