Oil extraction system adopting combined pipe column as oil extraction pipe

Abstract

The invention discloses an oil extraction system adopting a combined pipe column as an oil extraction pipe. The oil extraction system comprises a composite material continuous pipe and a metal oil pipe, the upper end of the composite material continuous pipe is connected with a ground connector, the lower end of the composite material continuous pipe is fixedly connected with the upper end of the metal oil pipe through an underground connector, and the lower end of the metal oil pipe is connected with an electric submersible pump; and the underground connector connects the composite material continuous pipe with the metal oil pipe to form the combined pipe column, and connects a power cable led out from the lower end of the composite material continuous pipe with a submersible cable led out from the upper end of the metal oil pipe. The electric submersible pump and the combined pipe column can be used in cooperation to achieve rodless oil extraction, and therefore the defects that a metal oil pipe or a composite material continuous pipe is independently used in cooperation with the electric submersible pump can be overcome; and meanwhile, the advantages that electric heating is achieved through the composite material continuous pipe located on the upper portion and the metal oil pipe located on the lower portion is not fear of high temperature can be utilized, and the rodless oil extraction technology leaps.

Description

technical field [0001] The invention relates to an oil production equipment, in particular to an oil production system using a combined pipe string as an oil production pipe. Background technique [0002] There are large reserves of heavy oil on the earth, and how to economically extract heavy oil is a great technical challenge. According to Chinese standards, at 50°C, the fluidity of 100-10,000 mPa is ordinary heavy oil, the fluidity of 10,000-50,000 mPa is extra-heavy oil, and the fluidity of 50,000 mPa or more is super-heavy oil. According to the thermal sensitivity characteristics of heavy oil, there are two fluidity inflection points with special significance. One is the inflection point from the flow following the Newtonian fluid law to the flow following the unique viscosity-temperature curve of heavy oil, and the other is the solidification inflection point. Ordinary heavy oil is in the state of Newtonian fluid above 50°C, but below 50°C, the viscosity will double ...

AI Technical Summary

Problems solved by technology

However, additional injection of viscosity reducer is costly, and a greater production of heavy oil must be able to be produced to meet the economic marginal production requirement

Therefore, for oil wells with too low fluid flow, it is not economical to inject thin oil, although it can meet the technical production requirements.

Images