Deepwater oil-gas test inner blowout preventer

Abstract

The invention discloses a deepwater oil-gas test inner blowout preventer and belongs to a safety device in a deepwater test tubular column. The deepwater oil-gas test inner blowout preventer mainly comprises a valve, a ball valve mechanism and a failure protection mechanism, a ball valve element is arranged inside a ball valve piston and provided with a guide groove, the ball valve piston is provided with an eccentric shaft which is inserted into the guide groove of the ball valve element, the ball valve piston drives the ball valve element to rotate when moving up and down, the lower end of the ball valve piston is connected with a piston connector through a thread, the lower end of the piston connector is abutted against a failure protection spring, and when a hydraulic system fails, thefailure protection spring pushes the ball valve piston to move. The deepwater oil-gas test inner blowout preventer adopts hydraulic control, and pressure of the test tubular column is adjusted by applying transient pressure at the upper end to maintain the pressure on a low level.

Description

Technical field [0001] The invention relates to the field of deep-water well completion testing, in particular to an internal blowout prevention device for deep-water oil and gas testing. Background technique [0002] In the process of oil and gas exploration and development, well completion testing is an important link. However, there is a big difference between offshore oil and gas well testing and land oil and gas well testing. There is a section of sea water, especially deep water oil and gas testing; oil and gas exploration and development are generally semi-submersible. The platform or the drilling ship is affected by wind, waves, currents and other movements such as heave, pitch, and yaw. Therefore, the difficulty and risk of deepwater oil and gas testing operations are quite high. In order to ensure the safety of the test operation, the deep-water oil and gas test string is equipped with multiple supporting safety devices; among them, the internal blowout prevention devic...

AI Technical Summary

Problems solved by technology

[0003] At present, there are many kinds of blowout preventers in the process of onshore oil and gas exploration and development, which are mainly used in the drilling process, and less used in the testing process

At the same time, the current blowout preventer can not meet the needs of deep water testing operations, and it also has the following shortcomings in the process of use: the blowout preventer is mostly mechanically controlled, that is, the blowout preventer needs to be controlled by an intermediate mechanism, which greatly increases the response time; Land well blowout preventer has no fail-safe mechanism, and once its control mechanism fails, the blowout preventer cannot be closed. When abnormal high-pressure oil and gas occur during the test, it cannot be effectively controlled, resulting in blowout and other dangers

At the same time, in deep-water oil and gas testing operations, it is necessary to release the high-pressure oil and gas sealed in the test string, and realize the internal communication of the test string through the positive pressure of the upper oil and gas to meet the needs of deep-water oil and gas testing operations. However, the existing The spraying device does not have this function

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