Method for real-time acquisition of working fluid level of surface drive screw pump well

Abstract

The invention belongs to the technical field of oil production, and particularly relates to a method for real-time acquisition of a working fluid level of a surface drive screw pump well. The method comprises the steps that first, well data is obtained, and active power of motor input of the surface drive screw pump well and relevant oil well parameters are collected; second, polish rod torque Mris obtained, and the polish rod torque is obtained by a motor of the ground drive screw pump well transmitting power through a reducing transmission device; third, torque M1 required for lifting fluidin a downhole screw pump is obtained; fourth, pump discharge pressure pout is acquired; and fifth, a value of the working fluid level of an oil well can be obtained according to a reusing formula. According to the method for real-time acquisition of the working fluid level of the surface drive screw pump well, the real-time monitoring of the working fluid level of the surface drive screw pump well can be achieved with high accuracy through the active power of the motor input of the surface drive screw pump well and the relevant oil well parameters which are measured on the ground, and the real-time working condition analysis, the intelligence and the informatization management level of the oil well can be improved; and the labor force, the material resources and the production managementcost are correspondingly reduced, the production efficiency is improved, and the production cost is saved.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a method for real-time acquisition of the dynamic liquid level of a ground-driven screw pump well. Background technique [0002] In oil field production, oil well dynamic liquid level data is an important basic data of oil well management. It directly reflects the liquid supply capacity of the oil well, reflects the energy status of formation liquid supply and the coordination relationship between supply and discharge, and is the key to the production of surface-driven screw pump wells. Important parameters for management evaluation and optimization adjustment. [0003] In the process of realizing the present invention, the applicant finds that there are at least the following deficiencies in the prior art: [0004] At present, the sonic method and the downhole pressure gauge method are commonly used in major oilfields to monitor the dynamic liquid lev...

AI Technical Summary

Problems solved by technology

Although this method is simple in technology and convenient in implementation, it is time-consuming, laborious, poor in timeliness, and has a long cycle. In addition, in wells with high gas-oil ratio or heavy oil production wells, due to the "foam section" or " Due to the influence of "dead oil block", the obtained test results have a large error, and some heavy oil wells cannot even be tested, which affects the correct evaluation of oilfield production wells

The latter is to determine the liquid surface depth according to the pressure gradient mutation in the oil well annulus. Although this method has high precision, it is complicated in construction, long in the measurement period, high in technical requirements, difficult in maintenance and high in cost, and cannot be widely applied.

[0005] Neither of the above two methods can realize the real-time monitoring of the dynamic liquid level of the oil well, and cannot meet the needs of the current informatization and intelligent construction of oil well production

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