FIELD: oil and gas industry. SUBSTANCE: this is used when difficult conditions occur in drilling holes. Method ensures higher reliability and tightness in isolation of beds. According to method, pipes are specifically profiled so that to make them longitudinally corrugated. Ends of pipes are left cylindrical without corrugations. Sections of profiled parts adjacent to cylindrical ends are upset to diameter of circumference described around them which is by 2-3% is less than diameter of circumference described around middle part of pipes. Made over perimeter of upset sections are endless rims and they are of height at which diameter of circumference described around them is close to diameter of circumference described around middle part of pipes. Then, corrugations are filled with sealing compound. Pipes are screwed together and blocking unit is lowered down to required level of well. EFFECT: high efficiency. 6 dwg
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