Method for determining reasonable intermittent pumping system for low-permeability oil well

Abstract

The invention discloses a method for determining a reasonable intermittent pumping system for a low-permeability oil well and relates to the field of petrochemical industry, in particular to the method for determining the reasonable intermittent pumping system for the low-permeability oil well. The method for determining the reasonable intermittent pumping system for the low-permeability oil well includes steps that drawing an IPR curve; drawing a relationship curve between a pump efficiency eta

and a fluid surface height h; determining a well opening time T; determining an oil well closing time T2; calculating an intermittent oil well pumping period T+T2; obtaining the intermittent pumping system for the low-permeability oil well and correcting the intermittent pumping period. The method for determining the reasonable intermittent pumping system for the low-permeability oil well finds out a fluid surface change rule through continuously monitoring the working fluid level; an oil well pump can run under a high fluid supply situation through determining the reasonable starting and stopping time of an oil pumping unit according to the method so as to dig the potential output, save energy and reduce consumption.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a method for determining a reasonable thinning system of low-permeability oil wells. Background technique [0002] During the development of low-permeability oilfields, it is very common for oil wells to have insufficient liquid supply capacity as the formation energy decreases significantly. Due to the unbalanced production and pumping, the pumping unit is in a low-efficiency working state for a long time, the energy is wasted seriously, and the ineffective wear of the equipment is aggravated, resulting in very low economic benefits. [0003] At present, major oilfields basically adopt the thinning method for low-efficiency wells, but for the convenience of management, a uniform and fixed thinning system is usually adopted. Generally, the start and stop of the pumping unit is controlled by installing a time controller at the wellhead, and this time controller usually contr...

AI Technical Summary

Problems solved by technology

This control method is actually a manual control method, and its control time interval is determined entirely based on experience. Since the actual fluid supply situation in the well is not considered, the following two situations may occur: 1. The interval time is set too short, causing Production starts before the downhole liquid level is recovered and at a reasonable position, resulting in a waste of electric energy; 2. The interval time is set too long, resulting in the downhole liquid level reaching a reasonable position and not being produced in time, shortening the effective production time of the oil well, resulting in a decrease in oil well production, failing to Make full use of the production capacity of the oil well

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