Multiposition one-way bypass connection structure for deep-water abandoned well cutting device

Abstract

The invention discloses a multiposition one-way bypass connection structure for a deep-water abandoned well cutting device, which comprises a one-way bypass connection body, a lower communicating pipe, a screw motor load-bearing support and a first non-return valve, wherein the one-way bypass connection body is provided with a shorting water hole and a one-way bypass hole which are connected with each other; the lower communicating pipe and the screw motor load-bearing support form a lower diversion channel which is connected with the one-way bypass hole; the first non-return valve is arranged on the shorting water hole; and a second non-return valve is arranged inside the one-way bypass hole. Due to the adoption of the non-return valves, the opening of the first non-return valve and the closing of the second non-return valve have no effect on the cutting operation. When drilling fluid flows through a middle diversion channel and enters a lower diversion channel, the second non-return valve is opened and the first non-return valve is closed under the gradually increased pressure of the drilling fluid, and hence cement is prevented from entering a screw motor from the lower end of a drilling tool. Therefore, the multiposition one-way bypass connection structure for the deep-water abandoned well cutting device has the advantages of realizing the completion of operations of cutting, salvaging and cementing through the same device, improving the performance of deep-water drilling operations, and reducing the cost of deep-water drilling and mining.

Description

technical field [0001] The invention relates to the field of deepwater drilling equipment, and more specifically, the improvement relates to a multi-position one-way bypass connection structure in a deepwater well abandonment cutting device. Background technique [0002] In the process of offshore oil drilling and other deep-water drilling operations, according to international practice, it is forbidden to leave any structures above the mud line at the wellhead without the approval of the national government department. Therefore, except for a few wellheads that have been reserved upon application, the vast majority of exploration wells must cut off the underwater wellhead system from below the mudline and recycle it after the task is completed, so as to eliminate the residues above the mudline at the wellhead, which is A deepwater well abandonment cutting device is required. [0003] However, in the field of offshore oil drilling operations when the water depth exceeds 300...

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Problems solved by technology

[0005] Therefore, prior art still needs to improve and develop

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