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Design method of throttle valve with pressure drop linearly changed with opening degree as well as valve core

A linear change and design method technology, applied in the field of oil drilling, can solve the problems of reducing enterprise efficiency, long research and development cycle, low efficiency, etc., achieve the effect of good pressure control linearity and adjustment accuracy, and improve design efficiency

Inactive Publication Date: 2016-02-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, such a design method is complicated in process, low in efficiency, long in research and development cycle, and high in development cost, which seriously reduces the efficiency of the enterprise.

Method used

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  • Design method of throttle valve with pressure drop linearly changed with opening degree as well as valve core
  • Design method of throttle valve with pressure drop linearly changed with opening degree as well as valve core
  • Design method of throttle valve with pressure drop linearly changed with opening degree as well as valve core

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] In one embodiment of the design method according to the present invention, at a displacement of 72m 3 Under the working condition of / h, design a kind of size and be the profile curve of the spool of 2 " (being 2 inches, be equivalent to 50.8mm). It is easy to understand that, in the specific embodiment of the present invention, design the spool of 2 inches For example only, the design method of the present invention is applicable to any size of spool, such as 1.5 inches, 3 inches, 5 inches or any other size, etc.

[0030] In one embodiment, when designing a 2-inch spool, it is required that the opening L and the pressure drop have a linear relationship within the 20%-80% effective stroke of the spool. Among them, the density of the medium used is ρ=1.7g / cm 3 , The effective stroke of the spool is not more than 30mm.

[0031] 1) Accor...

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Abstract

The invention discloses a design method of a throttle valve with pressure drop linearly changed with the opening degree. The design method comprises the following steps: a mathematic model of a valve core contour is established according to a target of a linear relationship between the pressure drop of the throttle valve and the opening degree, flow characteristics, an open area and geometric conditions of a valve core, a locus equation to be met by the contour of the valve core is deduced through an equivalent area curve equation, a contour curve of the valve core is obtained through the locus equation, and the valve core structure of the throttle valve is obtained. The managed pressure regulation linearity and the valve core contour curve with higher precision can be obtained with the design method, and the design method is more efficient and general.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a design method of a throttle valve whose pressure drop varies linearly with the opening degree and a spool of the throttle valve designed by the design method, the throttle valve is especially used for pressure control Drilling. Background technique [0002] In the managed pressure drilling technology (Managed Pressure Drilling—MPD), it is generally required that the variation range of the bottom hole pressure is less than 50 psi, and the pressure variation is mainly adjusted by the throttle valve used for pressure control. Therefore, the performance of the throttle valve used for pressure control directly affects the success rate of the MPD process. A well-adjusted linear spool is the key to determining the pressure control performance of the throttle valve. [0003] As the terminal element in the hydropneumatic control system, the regulating valve is indispensable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50F15B13/02
Inventor 王果王国荣牛新明陶思宇范红康朱颢刘建华楚飞张建龙孙连忠
Owner CHINA PETROLEUM & CHEM CORP
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