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Seabed wellhead pressure indicating and automatic adjusting device for deepwater dual-gradient well drilling

A wellhead pressure and automatic adjustment technology, which is applied to the automatic control system of drilling, drilling equipment, wellbore/well components, etc., can solve the problems of affecting the accuracy of wellbore pressure control and increasing the difficulty of seabed pressure monitoring, etc., to achieve simple structure, Achieve convenience and improve the effect of pressure control accuracy

Active Publication Date: 2015-09-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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AI Technical Summary

Problems solved by technology

The presence of seawater makes it more difficult to monitor seabed pressure, which further affects the control accuracy of wellbore pressure in dual-gradient drilling

Method used

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  • Seabed wellhead pressure indicating and automatic adjusting device for deepwater dual-gradient well drilling
  • Seabed wellhead pressure indicating and automatic adjusting device for deepwater dual-gradient well drilling

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Embodiment Construction

[0015] like figure 1 As shown, the subsea wellhead pressure indication and automatic adjustment device 100 for deepwater dual-gradient drilling includes: a subsea drilling fluid manifold system and a subsea wellhead pressure indication and automatic adjustment system; the subsea drilling fluid manifold system provides a flow channel for the wellbore to return drilling fluid , so that the drilling fluid can be returned to the drilling platform smoothly, and at the same time provide the basis for the subsea wellhead pressure indication and automatic adjustment system; the subsea wellhead pressure indication and automatic adjustment system can display the subsea wellhead pressure in real time and adjust the pressure to keep the subsea wellhead pressure constant It is equal to the hydrostatic pressure of seawater at the seabed, thus ensuring the smooth implementation of dual-gradient drilling; where:

[0016] Subsea drilling fluid manifold system, including: first three-way 101, f...

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Abstract

The invention belongs to the field of deepwater well drilling of petroleum engineering, and particularly relates to a seabed wellhead pressure indicating and automatic adjusting device for deepwater dual-gradient well drilling. The seabed wellhead pressure indicating and automatic adjusting device for the deepwater dual-gradient well drilling comprises a seabed drilling fluid manifold system and a seabed wellhead pressure indicating and automatic adjusting device, wherein the seabed drilling fluid manifold system provides a flowing channel to shaft returning and drilling fluid so that the drilling fluid can successfully return to a drilling platform and provide a foundation to the seabed wellhead pressure indicating and automatic adjusting device; the seabed wellhead pressure indicating and automatic adjusting device can display and adjust seabed wellhead pressure in real time, and keep seabed wellhead pressure to be constantly equal to seawater hydrostatic pressure at the seabed. According to the seabed wellhead pressure indicating and automatic adjusting device for the deepwater dual-gradient well drilling provided by the invention, the seabed wellhead pressure can be automatically kept to be constantly equal to the hydrostatic pressure of seawater deepwater dual-gradient well drilling process at the seabed so that the dual-gradient well drilling can be ensured to be successfully implemented.

Description

technical field [0001] The invention belongs to the field of petroleum engineering deep-water drilling, and in particular relates to a submarine wellhead pressure indication and automatic adjustment device for deep-water double-gradient drilling. Background technique [0002] my country's petroleum industry is gradually moving towards the ocean, especially the exploration and development of deepwater oil and gas fields in the South China Sea is constantly increasing. Offshore drilling, especially deepwater drilling, faces a harsher operating environment than land drilling. The prominent problem is that the "safe density window" is narrow due to the existence of seawater. Safe drilling in deep water requires that the pressure in the wellbore be controlled within the safe density window. Therefore, in order to make the pressure distribution in the wellbore closer to the two environmental pressure distributions faced in deepwater drilling (above the mud line is the seawater pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B44/00E21B43/01
Inventor 孙宝江张振楠王志远王宁王雪瑞闫国民赵阳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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