Production technique adopting electric submersible pump and jet sand-discharging pump for combined oil extraction and sand removal

Abstract

The invention discloses a production technique adopting an electric submersible pump and a jet pump for combined oil extraction and sand removal. The production technique mainly relates to the electric submersible pump, the jet pump, a cyclone desander, a well mouth extracted liquid control valve, a jet pump sand-discharging pipeline well mouth control valve and a one-way valve, wherein the electric submersible pump provides power liquid for the jet pump, and the one-way valve is used for preventing liquid extracted by the electric submersible pump from being discharged along the jet pump. Switching between the oil extraction process and the sand removing process is achieved mainly by adjusting the well mouth extracted liquid control valve and the jet pump sand-discharging pipeline well mouth control valve and adjusting a frequency converter to change the rotating speed of the electric submersible pump. According to the production technique adopting the electric submersible pump and the jet pump for combined oil extraction and sand removal, the one-way valve which can prevent the liquid extracted by the electric submersible pump from being discharged along the jet pump, the electric submersible pump which can provide high-pressure power liquid and the jet pump which has the solid-liquid mixed delivery function are ingeniously combined, the normal oil extraction procedure and the normal sand removing procedure are completed separately under the condition that the pumps are not stopped, the efficiency is improved, and the maintenance period of the electric submersible pump is prolonged. In addition, part of the high-pressure liquid extracted by the electric submersible pump is used as the power liquid, a device for providing power liquid on an offshore platform is omitted, and the space shortage of the offshore oil extraction platform is relieved.

Description

technical field [0001] The invention relates to the field of oil exploitation equipment and technology, in particular to the field of technology combining oil recovery with a submersible electric pump and sand pumping with a jet pump. Background technique [0002] After the oilfield entered the high water cut period, the long-term water injection development led to poor formation cementation. At the same time, the application of new technologies such as sand filling fracturing and polymer flooding made the sand production of oil wells more and more serious, which brought disadvantages to the normal production of the oilfield. influences. In terms of sand removal, the method widely used at home and abroad is to install sand control pipes downhole for sand control, which plays an important role in the production of sand producing oil wells. However, it has been found in the mining process of offshore oil wells in recent years that even if sand control screens are installed un...

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Problems solved by technology

[0003] The main purpose of the present invention is to overcome the defects in the existing technology of sand removal and sand removal in oil production, and propose a production process of combined oil production and sand removal with electric submersible pump and jet sand discharge pump, and realize the centrifugation of oil sand in combination with solid-liquid cyclone sand remover. Separation, one-way valve can prevent production fluid from being discharged along the jet pump, electric submersible pump can provide high-pressure power fluid and jet pump has solid-liquid mixed transport function, and complete normal oil production and sand cleaning respectively without stopping the pump process, improve efficiency, and extend the maintenance cycle of electric submersible pumps

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