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Multi-level fine choke manifold and automatic control system

A technology of automatic control system and choke manifold, which is applied in the direction of drilling automatic control system, drilling equipment, wellbore/well components, etc., which can solve the problems of choke valve erosion, difficult adjustment accuracy control, and choke valve failure And other issues

Inactive Publication Date: 2012-12-26
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

However, because the adjustment accuracy and adjustment intensity of the throttle valve are seriously nonlinear in the relative opening range (0~100%), the linear adjustment area is very narrow, and it is difficult to control the adjustment accuracy of the throttle valve under the condition of large flow , and the erosion of the throttle valve by the large flow rate is relatively serious, and the throttle valve is prone to failure

Method used

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  • Multi-level fine choke manifold and automatic control system
  • Multi-level fine choke manifold and automatic control system
  • Multi-level fine choke manifold and automatic control system

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Embodiment Construction

[0016] figure 1 It shows the ground multi-level fine choke manifold system in a best embodiment of the multi-stage fine choke manifold and the automatic control system of the present invention. Among them, 1 is the drilling fluid outlet gate valve returning from the wellhead; 2 is the gate valve at the inlet of the choke manifold; 3 is the gate valve at the outlet of the choke manifold; 4, 5, and 6 are the parallel choke manifold systems for different Three plate valves for pressure level adjustment; J is a throttle valve for fine adjustment under different pressure levels; 7 is a gate valve for the discharge pipeline; 8 is the outlet gate valve for the discharge pipeline.

[0017] refer to figure 2 A best embodiment of the automatic control system in the multi-stage fine detail manifold and the automatic control system of the present invention is shown. The system is a three-layer hierarchical control structure, which is divided into bottom-level measurement and control de...

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Abstract

A multi-level refined throttle manifold and an automatic control system are provided. The multi-level refined throttle manifold system is composed of multiple plate valves and a throttle valve that are connected in parallel. The automatic control system enables micro-adjustment of wellhead return pressure under different pressure grades through starting and closing the different plate valves, and through adjusting the throttle valves continuously. Automatic control system implements bumpless switching for the process of adjusting opening degree of the valves in order to make the process of adjusting wellhead return pressure fast and smooth.

Description

technical field [0001] The invention relates to the automatic control of oil and gas exploration and development, in particular to a fine automatic control system for drilling throttling pressure of oil and gas wells. Background technique [0002] In oil and gas exploration and development projects, with the expansion of oil and gas exploration fields and the advancement of technology, the requirements for the control technology of wellhead back pressure in the process of oil and gas drilling have been greatly improved. On the one hand, the near-balanced or under-balanced drilling method is used to better protect oil and gas layers, effectively reduce the damage of drilling fluid to oil and gas layers, reduce or overcome the impact of pressure difference on drilling speed, and effectively reduce the comprehensive cost of oil and gas well development , greatly increase the ROP and improve the success rate of oil and gas well drilling; on the other hand, when drilling a format...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/03E21B34/02E21B44/06
CPCE21B21/10
Inventor 柳贡慧朱忠喜李军
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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