Abstract
Purpose. The aim of this work is to develop an improved circulating system for airlift reverse circulation drilling in such a way that it allows the use of commercially available drill pipes with conventional connections. Methodology. The tasks were solved by a complex research method, which includes a review and generalization of literary and patent sources, analytical studies of existing methods for improving the technology of drilling wells with reverse circulation. Findings. A comparative analysis of the two main methods of creating reverse circulation was carried out: using a centrifugal pump and using an airlift. Particular attention is paid to the airlift method of creating reverse circulation. The dependence of the limiting depth of drilling with reverse circulation using an airlift on the speed of the upward flow of the drilling fluid and its density is studied. A fundamentally new improved version of the circulation system device for drilling wells with reverse circulation using an airlift is proposed. Its use allows the use of commercially available drill pipes and connections for this drilling method. Originality. It has been shown for the first time that it is possible to use commercially available drill pipes with conventional connections to create a circulation system for drilling wells with reverse circulation. This allows you to increase the drilling speed by reducing the time spent on hoisting operations and the build-up of the drill string. Practical value. An improved device of the circulation system for drilling wells with reverse circulation using an airlift has been developed. Thanks to its use, it becomes possible to use commercially available drill pipes with conventional connections. Key words: reverse circulation drilling, airlift, Mangistau Peninsula, Samskoye field.
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