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Continuous circulation drilling well system

A drilling and drill pipe technology, applied in the field of continuous circulation drilling system, can solve the problems of interruption of drilling fluid circulation, etc., to ensure continuous circulation, reduce downhole complex situations and downhole accidents, and simple and convenient operation

Inactive Publication Date: 2013-02-06
CNPC GREATWALL DRILLING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the deficiency of stopping the pump and interrupting the drilling fluid circulation in the process of tripping and connecting the single root in the existing drilling well

Method used

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  • Continuous circulation drilling well system

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Embodiment Construction

[0008] As shown in the accompanying drawings, a continuous circulation drilling system includes a faucet 8, a drill pipe 9 and a mud pump 10; a pressure gauge 4 is arranged on the pipeline at the upper end of the mud pump 10, and the mud pump 10 is connected to the standpipe valve 1 through the pipeline, and the standpipe The valve 1 is connected to the faucet 8 through the pipeline, and the faucet 8, the drill pipe 9, the continuous circulation nipple 5, and the drill pipe 9 are connected in sequence. The joint 6 is connected to the hose 7, and the hose 7 is connected to the branch valve 2 through the pipeline. The pipeline between the hose 7 and the branch valve 2 is provided with a pressure relief valve 3 and a pressure gauge 4, and the branch valve 2 is connected to the mud through the pipeline. pump 10.

[0009] During normal drilling, the standpipe valve 1 is opened, the branch valve 2 is closed, the continuous circulation nipple 5 is in the straight-through state, and t...

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Abstract

The invention relates to the technical field of continuous circulation drilling wells and particularly relates to a continuous circulation drilling well system. A pressure gauge is arranged on a pipe line at the upper end of a slush pump, the slush pump is connected with a vertical pipe valve through a pipe line, the vertical pipe valve is connected with a faucet through a pipe line, the faucet, a drill pipe, a continuous circulation short section and a drill pipe are connected sequentially, a side of the continuous circulation short section is connected with a quick coupling, the quick coupling is provided with a pressure gauge, the quick coupling is connected with a hose, the hose is connected with a branch valve through a pipe line, a pressure relief valve and a pressure gauge are arranged on a pipe line between the hose and the branch valve, and the branch valve is connected with slush pump trough a pipe line. According to the system, the pump is not required to be stopped during a trip and during connection of the drilling well, the continuous circulation of the drilling fluid is guaranteed, underground pressure fluctuation caused by starting and stopping of the pump is avoided, and underground complex situations and underground accidents caused by the fact that underground pressure fluctuation is too large are avoided, and the disadvantages that the pump is required to be stopped, and the circulation of drilling fluid is interrupted during a trip process and a connection process of an existing drill are overcome.

Description

Technical field: [0001] The invention relates to the technical field of continuous circulation drilling, in particular to a continuous circulation drilling system. Background technique: [0002] In conventional oil drilling operations such as tripping out and connecting single roots, it is necessary to stop the pump to interrupt the circulation of the drilling fluid. After completion, the pump must be turned on to resume the circulation. When the circulation is stopped / started, there will be pressure surges; when the circulation is stopped, the bottom hole pressure will drop. Layers may cause well kicks; when the circulation is restored, the sudden increase in bottomhole pressure will increase the pressure of sensitive formations, which may cause circulation loss; in the highly deviated well sections of extended-reach wells and horizontal wells, cuttings are likely to be formed when circulation is stopped bed; stopping the circulation will easily increase the temperature of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/12
Inventor 李伟张微靳树忠唐亮刘青云李彬姚建鹏曾艳春陆洋阳戴运才
Owner CNPC GREATWALL DRILLING ENG
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