Production string optimization device for oil well in case of electric submersible pump gas-locking

Abstract

A production string optimization device for an oil well in case of electric submersible pump gas-locking comprises a production casing, an electric submersible pump unit, an oil pipe, a packer, a gas exhaust valve, a small-diameter continuous oil pipe, a gas lift valve, a sliding sleeve, a subsurface safety valve, a Y-shaped tool, a working barrel plug and a pump outlet one-way valve, wherein the oil pipe is mounted in the production casing; the working barrel plug is mounted at the lower part of the oil pipe; the Y-shaped tool is mounted at the upper end of the working barrel plug; the pump outlet one-way valve is mounted at one end of the Y-shaped tool and connected with the electric submersible pump unit; the packer is mounted at the upper end of the Y-shaped tool; the sliding sleeve is mounted in a position of the oil pipe between the packer and the subsurface safety valve; the gas exhaust valve is mounted at one end of the packer and connected with the gas lift valve mounted at the upper part of the oil pipe through the small-diameter continuous oil pipe; and the gas lift valve is mounted at the lower end of the subsurface safety valve at the upper part of the oil pipe. According to the device, an original production Christmas tree is not required to be replaced, and under the condition that neither ground control equipment nor supercharging equipment is increased, gas lift production can be maintained for a long time, and gas locking can be effectively restrained.

Description

technical field [0001] The invention relates to the field of electric submersible pump oil production, in particular to an optimization device for production pipe strings of electric submersible pump airlock oil wells. Background technique [0002] Electric submersible pump oil production is one of the commonly used lifting methods in offshore oil fields at present, and has the advantages of large displacement and high head. However, its single lifting method is subject to the characteristics of multistage centrifugal pumps that are sensitive to free gas, and often shows certain limitations. As usual, due to the free gas entering the pump body, the working condition of the electric submersible pump is unstable, and even the air lock of the electric submersible pump stops discharging. The free gas entering the electric submersible pump has a great influence on the performance and life of the electric submersible pump. The more free gas enters the pump, the worse the pump per...

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Problems solved by technology

[0003] The conventional production string is designed for the Y-block type electric submersible pump unit, and the cable packer does not have a vent valve, and the distance from the suction port of the electric submersible pump is less than 15 meters

After the electric submersible pump of the lifting power equipment fails, the gas in the pump accumulates to form an air lock of the electric submersible pump. Due to the formation pressure, the oil well cannot self-spray, and the oil and gas production tubing is degassed and stratified. The one-way valve at the outlet of the electric submersible pump The above tubing forms a hydrostatic column. When the electric submersible pump starts up again, the outlet pressure of the electric submersible pump in the air lock cannot open the check valve, causing the electric submersible pump to stop discharging.

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