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Method for calculating supply and production balance rotating speed of electric submersible direct drive screw pump oil production well

A calculation method and screw pump technology, applied in pumps, production fluids, earthwork drilling and production, etc., can solve the problem that the speed of screw pumps cannot be adjusted according to the formation liquid supply conditions of oil wells, so as to avoid air pumping dry grinding and prolong the operating life Effect

Active Publication Date: 2020-05-08
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the rotation speed of the screw pump in the above-mentioned prior art cannot be adjusted according to the formation liquid supply situation of the oil well, and to provide a calculation method for the balance rotation speed of the electric submersible direct drive screw pump oil production well, which automatically adjusts the screw pump according to the calculation result. The speed of the pump can be adjusted, so that the oil well can achieve a balance between supply and production, effectively increase the production of the oil well, and prolong the operating life of the oil production unit

Method used

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  • Method for calculating supply and production balance rotating speed of electric submersible direct drive screw pump oil production well
  • Method for calculating supply and production balance rotating speed of electric submersible direct drive screw pump oil production well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] step1: Set the screw pump to run at the rated speed N, monitor the change of the dynamic liquid level H, if H rises, increase N at a certain rate until the dynamic liquid level H starts to decrease, and the unit starts at the current speed N 1 Run, when H drops to the height of the dynamic fluid level required to maintain a reasonable flow pressure in the oil well, start timing to calculate the time T required for the dynamic fluid level to continue to drop to the height L 1 ;

[0044] step2: Then reduce the speed at a certain rate until it reaches the speed N when the dynamic liquid level H starts to rise 2 , to calculate the time T required for the liquid level to rise to the same height L 2 ;

[0045] step3: Calculate N 初平 , N 初平 =(N 1 × T 1 )+(N 2 × T 2 )) / (T 1 +T 2 );

[0046] step4: The unit uses N 初平 Run, monitor the change of ΔH;

[0047] step5: Calculate N based on the change of ΔH 运平 .

Embodiment 2

[0049] Step1: Set the screw pump to run at the rated speed N, and monitor the change of the dynamic fluid level H. If H decreases, the unit will continue to operate at N. When H drops to the height of the dynamic fluid level required to maintain the reasonable flow pressure of the oil well, start timing calculation The time T required for the liquid level to continue to drop to a height L 1 ;

[0050] step2: Then reduce the speed at a certain rate until it reaches the speed N when H starts to rise 2 , to calculate the time T required for the liquid level to rise to the same height L 2 ;

[0051] step3: Calculate N 初平 , N 初平 =(N×T 1 )+(N 2 × T 2 )) / (T 1 +T 2 );

[0052] step4: The unit uses N 初平 Run, monitor the change of ΔH;

[0053] step5: Calculate N based on the change of ΔH 运平 .

Embodiment 3

[0055] step1: Set the high speed value N that can make the dynamic fluid level H drop according to the well conditions 1 And the low speed value N that can make the dynamic liquid level rise 2 ;

[0056] step2: The computer group starts with N 1 The time T required for the liquid level to drop to height L during operation 1 , and with N 2 The time T required for the dynamic liquid level to rise to the same height L during operation 2 ;

[0057] step3: Calculate N 初平 , N 初平 =(N 1 ×T 1 )+(N 2 ×T 2 )) / (T 1 +T 2 );

[0058] step4: The unit uses N 初平 Run, monitor the change of ΔH;

[0059] step5: Calculate N based on the change of ΔH 运平 .

[0060] The method for calculating the supply-production balance speed of electric submersible direct drive screw pump production wells of the present invention is an adaptive speed intelligent adjustment method, which can automatically and real-time adjust the operating speed of the electric submersible direct drive screw pump u...

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Abstract

Disclosed is a method for calculating the supply and production balance rotating speed of an electric submersible direct drive screw pump oil production well. The method comprises the steps that S1, an initial supply and production balance rotating speed is calculated, particularly, under the condition that the stratum liquid supply quantity is stable, an initial oil well supply and production balance rotating speed matched with the current stratum liquid supply quantity is calculated; S2, a supply and production balance rotating speed in the operation process is calculated, particularly, whenthe stratum liquid supply quantity changes, the fluctuation value of the dynamic liquid level of an oil well in the operation process of the electric submersible direct drive screw pump at the initial oil well supply and production balance rotating speed, and the initial oil well supply and production balance rotating speed is adjusted to obtain the supply and production balance rotating speed inthe operation process. The operation rotating speed of the electric submersible direct drive screw pump unit is automatically adjusted in real time according to the stratum liquid supply capacities of different oil wells, so that the oil wells reach supply and production balance, it is ensured that the oil wells operate in a reasonable flow pressure range, the problems of screw pump empty pumpingdry grinding, motor burning and the like caused by insufficient liquid supply of the oil wells due to overhigh rotating speed of screw pumps are avoided, and the influence of overlow rotating speed of the screw pumps on liquid supply of oil well stratums is also avoided.

Description

technical field [0001] The invention belongs to the field of oilfield development, and in particular relates to a method for calculating the supply-production balance speed of an electric submersible direct-drive screw pump oil production well. Background technique [0002] Electric submersible direct drive screw pump oil production is a lifting process that transmits electric energy to the downhole through the power cable, and the submersible motor and the direct drive screw pump are used for oil production in the downhole. This technology has the advantages of simple structure, safe and reliable operation, and convenient installation and maintenance. , low speed operation, large torque output, flexible control, and low energy consumption for oil recovery can fundamentally eliminate eccentric wear and improve system efficiency from the source. It is a better technical solution for cost reduction and efficiency improvement at this stage. During the operation of electric subm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B45/00E21B44/00E21B47/00F04C2/107
CPCE21B43/128E21B45/00E21B44/00E21B47/00F04C2/107
Inventor 呼苏娟甘庆明李佰涛张磊杨海涛魏韦刘涛张岩牛彩云石海霞
Owner PETROCHINA CO LTD
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