Emergency rescue system for blowout accidents and emergency rescue method of emergency rescue system
A kind of accident and box technology, which is applied in the direction of drilling equipment, earthwork drilling, wellbore/well components, etc. It can solve the problems of inability to inject high-density drilling fluid, inability to complete wellhead operations, inability to achieve well killing, etc., to achieve wellbore The effect of restoring the state to normal, reducing the difficulty of alignment and fixing, and shortening the installation time
Active Publication Date: 2021-10-08
陕西瑞鹰国际油气工程技术服务有限公司
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Problems solved by technology
[0004] However, when high-temperature liquid and steam are ejected from the wellhead, and there is no effective well control equipment or the well control device fails, the wellhead operation cannot be completed, so that well killing cannot be achieved
Even if there are drilling tools in the well, but the pressure is high and the drilling tools in the well are less and lighter, the drilling tools will be sprayed out of the wellhead or pressed against the power head of the drilling rig, and high-density drilling fluid cannot be injected, resulting in uncontrollable blowout
Method used
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[0118] In a geothermal well in central China, the wellhead was not equipped with well control equipment. During the drilling process, steam channeling occurred at the wellhead, and the well was not killed in a timely and effective manner, resulting in blowout. High pressure and high temperature were emitted from the wellhead casing 33 and drill pipe annular space The steam, accompanied by liquid, was sprayed at a height of more than ten meters, and the workers were unable to carry out normal operations. They tried to block it by throwing shot balls from the annular space, and it was sprayed out. The temperature of the inlet casing 33 reached 155°C. In order to restore the well from the state of channeling steam to the original equilibrium state and prevent secondary accidents, the rescue system for blowout accidents of the present invention is used for rescue.
[0119] The specific steps of the blowout rescue method are as follows:
[0120] 1. Close the annulus
[0121] 1.1. ...
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The invention belongs to the technical field of drilling equipment, and particularly relates to an emergency rescue system for blowout accidents and an emergency rescue method of the emergency rescue system. The emergency rescue system for the blowout accidents comprises a bottom fixing device, a square box plugging device and a drill rod locking device. The square box plugging device is fixed to the bottom fixing device, and the drill rod locking device is located above the square box plugging device. The bottom fixing device comprises a left bottom plate and a right bottom plate which are the same in structure. The square box plugging device comprises an upper box body, a lower box body and an exhaust mechanism. The upper box body is located above the lower box body, and the exhaust mechanism is installed on the side portion of the lower box body. According to the emergency rescue system for the blowout accidents, an accident well can be effectively killed, and threats to the natural environment and life and property safety of people are eliminated.
Description
technical field [0001] The invention belongs to the technical field of drilling equipment, and in particular relates to a rescue system for blowout accidents and a rescue method thereof. Background technique [0002] During the drilling and development of geothermal energy, there may be blowout accidents in which high-temperature, high-pressure liquid and water vapor are ejected from the wellhead. It is not enough to balance the formation pressure, resulting in a large influx of formation fluid into the wellbore, and the failure of the ground control system cannot be effectively controlled. [0003] Blowout phenomenon is very dangerous. Usually, high-temperature and high-pressure liquid and steam are ejected from the wellhead, which poses a great threat to the natural environment and people's life and property safety. The common rescue method is to inject dense drilling fluid into the well from the drill pipe or the annulus between the drill pipe and the casing to increase ...
Claims
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IPC IPC(8): E21B33/06E21B19/10
CPCE21B33/06E21B33/061E21B19/10Y02E30/30
Inventor 尹泽刚雷海华吕斌昌江荣陈永宏施红政
Owner 陕西瑞鹰国际油气工程技术服务有限公司