IMPROVEMENT OF BOTTOM HOLE AIR CLEANING TO REDUCE ACCIDENT RATE OF WELL DRILLING AT KUYUMBINSKOE OILFIELD

Abstract

The relevance of the research. The problem of washing fluid absorption during the construction of upper sections of production and exploration wells in the fields of Eastern Siberia is not new and is one of the main reasons for low rate of commercial drilling speed in the region. In addition, penetration of trouble intervals of wells requires considerable time and material costs. Air drilling is one of the promising solutions to the problem of absorption of washing liquid. The air drilling technique has been known for more than a hundred years, however, a new horizons of its application are opening up by the reason of the compressor’s engineering progress. At the same time, it is necessary to adapt the existing methods of calculating air supply to the new mining and geological conditions for this technology. The paper introduces the main results of practical research in air cleaning of bottom hole during the drilling of the surface casing interval in the geological and economic context of Kuyumbinskoe oilfield. The aim of the research is to study and develop a new methodology for trouble-free air drilling of intervals for directions and conductors in the construction cycle of production and exploration wells in fields in Eastern Siberia. Object: the B.B. Kudryashov’s method of calculating the air supply of the circulation system of a well. Methods: combination of theoretical studies, mathematical modeling based on the basic principles of the theory of pneumatic transport, movement of dispersed particles in a carrier air stream and pilot works in real production conditions. Results. The authors have stated the regulations that allow modifying the computational methodology for air supply to the well circulating system, the use of which will help prevent emergency situations at the design stage.

Keywords

• air cleaning of bottom hole
• aerodynamic drag
• b. kudryashov’s method
• catastrophic loss of circulating fluid
• control over drilling technique
• aerodynamic pressure in a well