ON THE ISSUE OF PREPARING THE WELLBORE FOR ITS FASTENING

. The proposed article analyzes the issue related to the preparation of the wellbore for cementing the drilled interval of the well. It has been revealed that poor-quality cleaning of the well bore, including the existing cavities from drilling, brings great problems to the drilling process. For example, in conditions of insufficiently effective removal of cuttings to the surface due to the presence of a gradient layer in the flow of flushing fluid and stagnant zones in the caverns, accumulation of drill cuttings occurs. In the process of well placement, due to changing hydrodynamic conditions (pressure and flow fluctuations) when performing technological operations (flushing, development, drilling, tripping, etc.) and at certain volumes of the accumulated sludge volume in the cavity, it slips into the wellbore wells. As a result of the drilling tool sticking in many wells, sticking of the string with loss of a certain part of the wellbore takes place. The analysis carried out using buffer liquids known and widely used in the process of well fixing allowed us to reveal that these compositions, along with the