A Calculation Method of Supply-production Balance Speed ​​of Electric Submersible Direct Drive Screw Pump Production Well

A calculation method and technology of screw pumps, 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 fluid supply conditions of oil wells, so as to avoid large-scale fluctuations and prolong operation The effect of longevity

Active Publication Date: 2022-05-10
PETROCHINA CO LTD
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  • 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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  • A Calculation Method of Supply-production Balance Speed ​​of Electric Submersible Direct Drive Screw Pump 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 ...

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Abstract

A method for calculating the supply-production balance speed of an electric submersible direct-drive screw pump production well, comprising steps: S1, calculating the initial supply-production balance speed; when the formation liquid supply is stable, calculating the initial supply-production balance speed that matches the current formation liquid supply Oil well supply-production balance speed; S2, calculation of supply-production balance speed during operation; when the formation liquid supply changes, monitor and calculate the dynamic fluid level of the oil well during the operation of the electric submersible direct drive screw pump at the initial oil well supply-production balance speed The fluctuation value of the initial oil well supply-production balance speed is adjusted to obtain the supply-production balance speed during operation. According to the formation liquid supply capacity of different oil wells, the present invention automatically and in real time adjusts the operating speed of the electric submersible direct drive screw pump unit, so that the oil wells can reach the balance of supply and production, ensure that the oil wells keep running within a reasonable flow pressure range, and avoid excessively high screw pump speeds. Causes problems such as screw pump emptying, dry grinding, motor burning caused by insufficient liquid supply of oil wells, and also avoids too low speed of screw pumps affecting the liquid supply of oil well formations.

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 in which the electric energy is transmitted to the downhole through the power cable, and the submersible motor directly drives the screw pump for oil production in the downhole. This technology has the advantages of simple structure, safe and reliable operation, convenient installation and maintenance, The advantages of high torque output at low speed, flexible control, and low energy consumption for oil production can fundamentally eliminate partial 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 electri...

Claims

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Application Information

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Patent Type & Authority Patents(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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