Well repair system for shallow water underwater horizontal Christmas tree and operation method of well repair system
An operation method and Christmas tree technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as the complexity of the underwater wellhead pressure control system and the inability to adapt to the underwater wellhead workover mode, and achieve reliable The effect of safety barriers
Active Publication Date: 2022-08-05
CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD +1
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Problems solved by technology
The conventional shallow water workover mode needs to rely on the jacket platform for workover operations, which cannot adapt to the subsea wellhead workover mode
Deepwater subsea wellhead workover mode requires the use of floating operating vessels, so the subsea wellhead pressure control system for the workover is relatively complicated, including multiple underwater pressure barriers and emergency release devices
Method used
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[0049] Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present invention will be more thoroughly understood, and will fully convey the scope of the present invention to those skilled in the art.
[0050] The invention belongs to the wellbore intervention and workover operation of oil and gas wells developed by shallow water underwater wellheads, and particularly relates to oil and gas wells adapted to shallow water underwater wellhead development. Downhole wellbore intervention and workover operations in oil and gas wells, including wireline operations and coiled tubing operations.
[0051] The main invention points:
[...
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The invention relates to a well repair operation method for a shallow water underwater horizontal Christmas tree, which comprises the following steps of: upwards mounting an adapter, an isolating valve, a vertical pipe and a flowing four-way joint from the horizontal Christmas tree, keeping the isolating valve in an open state in the assembling process, and closing the isolating valve after the isolating valve is butted with an underwater wellhead; high-pressure fluid is pumped in through the flowing four-way joint, and the high-pressure fluid flows downwards along the vertical pipe so as to test the bearing pressure of the isolating valve; opening the isolating valve to release pressure, and then continuously pumping the high-pressure fluid to test the connection between the adapter and the horizontal Christmas tree; and a control valve of the horizontal Christmas tree is opened, the high-pressure fluid continues to be pumped in, and the high-pressure fluid enters an oil pipe below an oil pipe channel plug in the horizontal Christmas tree after passing through the isolation valve. And a reliable safety barrier for the shaft in the shaft intervention or workover operation process can be realized.
Description
technical field [0001] The invention relates to the technical field of offshore oil engineering drilling and production, in particular to a well workover system for shallow water underwater horizontal Christmas trees and an operation method thereof. Background technique [0002] In some shallow water offshore oil and gas fields, due to the limitations of waterways and ecological protection areas, it is impossible to build jacket platforms for oil and gas field development, and shallow water Christmas trees have become an alternative. The conventional shallow water workover mode needs to rely on the jacket platform for workover operations, which cannot be adapted to the workover mode of the subsea wellhead. In the deepwater subsea wellhead workover mode, because a floating operation vessel is required, the subsea wellhead pressure control system supporting the workover is relatively complex, including multiple underwater pressure barriers and emergency relief devices. For sh...
Claims
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IPC IPC(8): E21B43/01E21B33/035E21B33/038E21B34/04
CPCE21B43/01E21B33/035E21B33/038E21B34/04
Inventor 李中盛磊祥王名春许亮斌王金龙谢仁军曹砚锋王宇李梦博王彬
Owner CHINA NATIONAL OFFSHORE OIL (CHINA) CO LTD