IMPROVEMENT OF THE OPERATION OF SUBMERSIBLE CONTAINERS OF DOWNHOLE UNITS FOR OIL PRODUCTION

Abstract

The stable growth of oil production in the Russian Federation observed in recent years is characterized by commissioning of new fields and off-balance hydrocarbon reserves. In these conditions, occurrence of complications during operation of wells by mechanized method significantly increases the costs of enterprises and reduces the cost-effectiveness of oil production. The article presents statistical data on failures of submersible pumping units caused by complicated operating conditions. It is shown that one of the most widespread complicating factors is high corrosive activity of the well fluid and development of scaling that lead to failures of submersible pump units, reducing their operation time below the warranty period. It is indicated that out of the currently existing methods of preventing scale deposition and reducing the intensity of corrosion of downhole equipment in oil production the most technologically and economically feasible is the chemical method, which is realized through the use of inhibitors. Nowadays producers of oil and gas equipment produce in batch borehole containers for solid and encapsulated inhibitors. The main disadvantage of these submersible containers is uneven dosing of reagents into the wells. Experimental downhole submersible containers for liquid reagents are characterized by unstable and unreliable operation, complexity and high cost. The presence of significant disadvantages of experimental and commercially available submersible containers has necessitated the development of the most versatile, reliable and efficient products. The authors propose a design of a mechanized downhole submersible container equipped with a plunger pump and performing a uniform feeding of an inhibitor into a well.