Linear Design of Pressure-control Throttle Valve Based on Variable-diameter Profile Optimization

doi:10.3969/j.issn.1004-132X.2026.07.008

Abstract

Abstract:

To improve pressure control accuracy in managed-pressure-drilling for deep and ultra-deep wells， this paper proposes a linear design method for multiple-type throttle valves based on variable-diameter profile optimization. A dynamic mapping relationship between valve core stroke and throttling area was established， incorporating the viscous-fluid total-flow Bernoulli equation， Leibniz theorem， and kinetic energy and area correction mechanisms. Using this approach， the profiles of cylindrical and wedge-shaped valve cores were optimized. Experimental results demonstrate that the linear correlation coefficients of pressure drop for the cylindrical valve and wedge-shaped valve reach 0.9932 and 0.9919， respectively， within the 0-100% effective stroke range. These findings confirm that the proposed method enables fullstroke linear pressure control of throttle valves.

Key words: linear pressure-drop response, variablediameter profile optimization, valve core design, throttle valve, managed-pressure-drilling

摘要：

针对深井及超深井控压钻井节流阀开度与压降非线性导致的控压精度不足问题，提出了基于变径轮廓优化的多类型节流阀线性设计方法。通过建立阀芯行程与节流面积的动态映射关系，并结合黏性流体总流伯努利方程、Leibniz 定理，以及动能和面积的修正机制，对筒形阀芯和楔形阀芯的轮廓进行优化设计。实验结果表明，筒形阀、楔形阀在 0～100% 有效行程范围内的压降线性相关系数分别达到 0.9932 和 0.9919，验证了所提方法可实现节流阀的全行程线性控压。

关键词: 线性化压降响应, 变径轮廓优化, 阀芯设计, 节流阀, 控压钻井

CLC Number:

TP242

CHEN Yazhou, WANG Guorong, DONG Xuecheng, TANG Yang. Linear Design of Pressure-control Throttle Valve Based on Variable-diameter Profile Optimization[J]. China Mechanical Engineering, 2026, 37(7): 1595-1602.

陈亚洲, 王国荣, 董学成, 唐洋. 基于变径轮廓优化的控压节流阀线性设计[J]. 中国机械工程, 2026, 37(7): 1595-1602.

Figures/Tables 15

Fig.1 The working principle of the commonly used throttle valve in managed pressure drilling

Fig.2 Structural characteristics of the valve core and schematic illustration of the throttling area

Fig.3 The secondary flow generated at the corner of the pipe

Fig.4 Diagram showing the throttling area and the arc-shaped area micro-section

Fig.5 The envelope line of the valve core's variable diameter profile

Tab.1 Drilling operation working condition parameters

参数	数值
公称通径/ mm	50.8
流体密度/（ g·cm^-3）	1.7
流体泵排量/ （m³·h^-1）	72
阀芯有效行程/ mm	30
节流阀最大调节压力/ MPa	20
节流阀最小调节压力/ MPa	5

Fig.6 Correction trend of throttling area Ar with effective stroke y

Fig.7 Schematic of contour point parameters and feature surfaces

Fig.8 Experimental schematic diagram

Fig.9 Pressure contours

Fig.10 Velocity contours

Fig.11 Throttling pressure drop ratio under different kinetic energy correction coefficients

Table 2 Parameters of different fluids in the experiment

	第一种流体	第二种流体
密度（kg/m³）	1700	1030
黏度（Pa·s）	0.02	0.005

Fig.12 Comparison of theoretical values and experimental values under the first fluid parameter setting

Fig.13 Comparison between theoretical and experimental values under the second fluid parameter set

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