Technology of pumping production of high-viscosity oil with injection of coolant to the bottom through hollow rods

¹ Institute of Oil and Gas FSBEI of HE “Ufa State Petroleum Technological University”, (Branch in the City of Oktyabrsky), 54a, Devonskaya Street, Oktyabrsky, Republic of Bashkortostan, 452607, Russian Federation
² Ufa State Petroleum Technological University, 1, Kosmonavtov St., Ufa, Republic of Bashkortostan, 450064, Russian Federation

^* Corresponding author: info@of.ugntu.ru

Abstract

The purpose of the study is to develop a pumping unit that allows successful injection of coolant into the bottom of the well through a column of hollow rods, followed by oil extraction from the well without lifting equipment. The scientific novelty of the material is based on the possibility of heating the bottom-hole zone of the formation and simultaneous oil production. The technological process of extracting hard-to-recover oil using the proposed installation is based on the following operations: withdrawal of the intake into the annulus, descent of the pump shank into the horizontal shaft; steam injection to the shank and its movement within the bottom-hole zone of the formation - warming up of the near-well area; commissioning of the well with a specially selected technological mode of operation of deep-pumping equipment. The field results of testing the steam injection technology at well No. 3777 of Novo-Sheshminskaya Square are reflected, which showed the fundamental possibility of its application for the successful development of high-viscosity oil deposits. The study also found that for the wide application of the proposed technology, it is necessary to successfully solve a number of tasks, among which the most urgent is the issue of effective thermal insulation of hollow rods in order to minimize heat loss during injection of a special substance. Further development of the proposed technology of pumping production of high-viscosity oil lies in the use of modern materials for the production of underground equipment and improvement of the design of pumping units, aimed at increasing the parameter of the inter-repair period. The proposed technology can be used in the fields of the Volga-Ural oil and gas province, in particular, for example, at the Ashalchinsky field, which will significantly increase the percentage of recoverable reserves characterized as difficult to recover.