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Method and device for acquiring characteristic curve of rod-pumped well underground system

A technology for pumping wells and characteristic curves, which is applied in mechanical equipment, machines/engines, and liquid-variable-capacity machinery, etc., can solve problems such as unification of node analysis methods and complex processes that are not conducive to optimal design, and achieve optimal design and node analysis. The method is unified, and the effect of node analysis and optimization design is convenient

Active Publication Date: 2014-11-19
PETROCHINA CO LTD
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Problems solved by technology

Since there is no characteristic curve of the downhole system of the pumping well, the process of optimal design of the pumping well is very complicated, and it is not conducive to the unification of optimal design of various lifting methods and node analysis methods

Method used

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  • Method and device for acquiring characteristic curve of rod-pumped well underground system
  • Method and device for acquiring characteristic curve of rod-pumped well underground system
  • Method and device for acquiring characteristic curve of rod-pumped well underground system

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Embodiment Construction

[0040]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0041] The technical scheme of the present invention comprehensively considers the interaction of oil pipe, sucker rod, pump and wellbore fluid during production, and takes the downhole lifting system below the polished rod as a whole. In order to predict the characteristic curve of the downhole system of the pumping well, firstly The parameters of the rod pump downhole system are given, and then the actual displacement corresponding to different pump pressure d...

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Abstract

The invention provides a method and a device for acquiring a characteristic curve of a rod-pumped well underground system. The method includes: using an underground lifting system below a polished rod as a whole, and giving parameters of the rod-pumped well underground system; acquiring the characteristic curve of a pump inlet and outlet pressure difference related to actual displacement of a pump, according to the parameters of the rod-pumped well underground system; further, acquiring a characteristic curve of the pump inlet and outlet pressure difference related to power of the rod-pumped well underground system and acquiring a characteristic curve of the pump inlet and outlet pressure difference related to efficiency of the rod-pumped well underground system.

Description

technical field [0001] The invention relates to the technical field of oilfield mechanical oil recovery, in particular to a method and a device for obtaining the downhole system characteristic curve of a pumping unit well. Background technique [0002] Rod pumping system is the earliest mechanical oil recovery method, and it is still the most important artificial lift method at home and abroad. Rod well pump is a kind of reciprocating pump. It works in deep well conditions and has super long sucker rods. When working underground, it is greatly affected by the elastic deformation of sucker rods and tubing, and the degree of pump filling. The downhole system of oil rods, tubing and oil well pumps has different working characteristics than ordinary surface reciprocating pumps. [0003] For rod pumping systems, there has been a lack of equipment characteristic curves similar to electric submersible pumps and screw pump systems, which increases the complexity of node analysis an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B51/00
Inventor 赵瑞东师俊峰陶珍张建军熊春明马文明张鑫孙慧峰
Owner PETROCHINA CO LTD
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