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A method for adjusting axial gap between stator and rotor of screw pump

A technology of axial clearance and adjustment method, which is applied in pumps, pump control, earthwork drilling and production, etc., and can solve problems such as the diameter increase of coaxial double hollow sucker rods

Active Publication Date: 2016-09-07
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, the coaxial double-hollow sucker rods with coaxial double-hollow sucker rods have been successfully used for cold recovery of extra-heavy oil. Adjustment to clearance is done empirically

Method used

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  • A method for adjusting axial gap between stator and rotor of screw pump
  • A method for adjusting axial gap between stator and rotor of screw pump
  • A method for adjusting axial gap between stator and rotor of screw pump

Examples

Experimental program
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Effect test

Embodiment Construction

[0046] Taking well X-67 as an example, the method of adjusting the length of the axial clearance between the stator and rotor of the screw pump is explained.

[0047] Contains the steps of measuring the stator and rotor data of the screw pump;

[0048] Data include: coaxial double hollow sucker rod running depth, temperature difference between inlet and outlet;

[0049] The length of the axial gap between the stator and the rotor of the screw pump; the quality of the heat carrier softened water in the coaxial double hollow sucker rod, the flow rate of the heat carrier softened water in the coaxial double hollow sucker rod; the coaxial double hollow sucker rod The pressure of the circulating water in the internal circulation, the cross-sectional area of ​​the oil pipe, the radius of the coaxial double hollow sucker rod body, the elongation per kilometer of the coaxial double hollow sucker rod, and the elasticity of the coaxial double hollow sucker rod Modulus, the polar moment...

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Abstract

An adjustment method of axial clearances of a stator and a rotor in a screw pump belongs to the field of oil production engineering of oil industry. The adjustment method includes a step of measuring data of the stator and the rotor in the screw pump. The method also includes following steps: (1) establishing a calculation model of the adjustment method of the axial clearances of the stator and the rotor in the screw pump with optimized length of the axial clearances of the stator and the rotor in the screw pump as a target and with setting depth of a coaxial double-hollow sucker rod and the difference of inlet temperature to outlet temperature as constraint conditions; (2) solving the numerical value of the model; (3) obtaining an adjustment length of the axial clearances of the stator and the rotor in the screw pump; and (4) adjusting the axial clearances of the stator and the rotor in the screw pump. The adjustment method enables lifting of the axial clearances of the stator and the rotor in the screw pump to be simple and accurate, can completely avoid stuck pump, and can greatly increase primary operation successful rate of a screw pump well.

Description

technical field [0001] The invention relates to a method for adjusting the axial gap between a screw pump stator and a rotor, and belongs to the field of oil recovery engineering in the petroleum industry. Background technique [0002] The relatively successful and potential heavy oil cold recovery technologies include sand production cold recovery, Vapex and chemical cold recovery, etc. The screw pump has a continuous and stable pressure "window" and has become a heavy oil cold recovery lifting equipment at home and abroad. Many successful reports, after Chen Yonghong and others calculated the elongation of the sucker rod string in screw pump wells, the anti-shock distance determination method proposed makes the lifting simple and accurate, and the pump stuck rate is almost zero. In recent years, the coaxial double-hollow sucker rods with coaxial double-hollow sucker rods have been successfully used for cold recovery of extra-heavy oil. Adjustment to the clearance is perfo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C2/107F04C14/00E21B43/00
Inventor 付亚荣
Owner PETROCHINA CO LTD
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