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Well pressure control system and method used in well cementation stage

A wellbore pressure and control system technology, which is applied in wellbore/well components, earthwork drilling and production, measurement, etc., can solve the problems of increasing drilling difficulty, reducing drilling efficiency, and easy leaky formations in long well sections

Active Publication Date: 2017-01-04
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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Problems solved by technology

However, deepwater drilling often faces problems such as long well sections and multi-layer leaky formations. The above cementing technology cannot solve such problems smoothly, and usually requires three, four or even more cementing stages. , which greatly increases the difficulty of drilling and reduces the drilling efficiency

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  • Well pressure control system and method used in well cementation stage
  • Well pressure control system and method used in well cementation stage
  • Well pressure control system and method used in well cementation stage

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Embodiment Construction

[0048] The specific implementation manners of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described here are only used to illustrate and explain the embodiments of the present invention, and are not intended to limit the embodiments of the present invention.

[0049]Aiming at the problems of long well sections and multi-layer leaky formations in deepwater drilling, the present invention proposes a wellbore pressure control system, which uses the return pipeline to lift the fluid in the annular space of the wellbore back to the platform, and at the same time, through the return pipeline Low-density fluid or gas is injected to reduce the pressure of the liquid column in the return line, thereby reducing the pressure exerted on the leaky formation in the annulus of the wellbore. After sealing the leaky formations in the long well section a...

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Abstract

The embodiment of the invention provides a well pressure control system and method used in a well cementation stage and belongs to the field of ocean oil and gas development. The well pressure control system comprises an injection pump and a control device, wherein the control device is used for controlling the injection pump to inject fluid or gas into a backflow pipeline (communicated with an annular space of a well shaft) through an injection pipeline, reducing the pressure in the backflow pipeline and reducing the pressure in the annular space. The density of the fluid or gas is lower than the density of the drilling fluid in the annular space. According to the scheme provided by the invention, the accidents including well kick, blowout, and the like, triggered by the easy leaking ground layer cracked by the high-density cement paste in the well cementation process can be effectively avoided.

Description

technical field [0001] The invention relates to the field of offshore oil and gas development, in particular to a wellbore pressure control system and a wellbore pressure control method used in the cementing stage. Background technique [0002] There are abundant oil and gas resources in the deep waters of the world, and further development and utilization of deep water oil and gas resources is the general trend. Deepwater cementing technology is an essential link in the process of deepwater oil and gas development, but many problems brought about by deepwater pose severe challenges to deepwater cementing technology. Since a considerable part of the overlying strata in the deep water area is replaced by seawater, the pressure of the overlying strata is lower than that on land. Under such a low overlying strata pressure, the formation tends to have a lower fracture pressure. The rapid deposition rate and the common development of abnormal pore pressure will make the window o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
CPCE21B33/13E21B33/138E21B47/06E21B33/146
Inventor 孙宝江王雪瑞马英文高永海
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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