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Pressure control device for continuous circulating drilling

A pressure control and drilling technology, which is applied in earthwork drilling, wellbore flushing, wellbore/well components, etc., can solve the problems of prolonging drilling operation time, unstable wellbore pressure, and wellbore collapse, etc., so as to maintain the wellbore The effect of stable pressure, shortening drilling operation time and reducing drilling cost

Inactive Publication Date: 2017-01-04
CNPC BOHAI DRILLING ENG
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wellbore pressure is unstable, and risks such as circulation loss, wellbore collapse, formation rupture, well kick, and differential pressure sticking may occur. At the same time, stopping and re-establishing pressure circulation prolongs the drilling operation time and increases the drilling operation cost

Method used

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  • Pressure control device for continuous circulating drilling
  • Pressure control device for continuous circulating drilling
  • Pressure control device for continuous circulating drilling

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Embodiment Construction

[0017] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

[0018] see Figure 1 to Figure 6 , the pressure control device for continuous circulation drilling of the present invention includes a body, the middle part of the body is vertically penetrated to form a through hole for the drill pipe to pass through, and four rams are installed in the through hole of the body, each of which The rams are respectively spliced ​​by two semi-rams with symmetrical structures, and each of the half rams is driven by a hydraulic cylinder.

[0019] The four rams are respectively a full-sealing ram 1, a slip ram 4, a load-bearing ram 5 and a pipe ram 8 arranged in sequence from top to bottom, wherein the full-sealing ram 1, the load-bearing ram 5 and the pipe ram The rams 8 are arranged in parallel, and the slip rams 4 and the load-bearing rams 5 are staggered at 90° horizontally.

[0020] The full-sealing ram 1 ...

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Abstract

The invention discloses a pressure control device for continuous circulating drilling. The pressure control device for continuous circulating drilling comprises a body, a through hole for allowing a drill rod to penetrate through is formed in the middle of the body, four rams are further installed in the through hole of the body, each ram is formed by splicing two half rams of the symmetrical structure, and each half ram is driven by a hydraulic cylinder. The four rams comprise the blind ram, the slip ram, the bearing ram and the pipe ram sequentially from top to bottom, wherein the blind ram, the bearing ram and the pipe ram are arranged in parallel, and the slip ram and the bearing ram are crossed by 90 degrees. The pressure control device can reduce pressure fluctuation of a wellhead when single-joint unit or three-joint unit connection and disconnection circulation stops or starts, keep the pressure of the wellhead stable, and can ensure that the formed well wall does not collapse to the greatest extent, drilling accidents are greatly reduced, and the risks of circulation loss, stratum cracking, well kick, pressure differential sticking, and jamming of a drill bit or bottom drill combination are greatly reduced.

Description

technical field [0001] The invention relates to a control system for drilling operations, in particular to a pressure control device for continuous circulation drilling. Background technique [0002] During drilling operations of conventional wells, horizontal wells, and underbalanced wells, it is necessary to connect and unload single roots or vertical roots during drilling operations. When the high-pressure drilling fluid is stopped and recirculated, pressure fluctuations will occur in the well. Wellbore pressure is unstable, and risks such as circulation loss, wellbore collapse, formation rupture, well kick, and differential pressure sticking may occur. At the same time, stopping and re-establishing pressure circulation prolongs drilling operation time and increases drilling operation costs. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a pressure control device for continuous circulation drilling that does ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/08
CPCE21B21/08
Inventor 马金山齐金涛徐朝阳郗凤亮苏尚文屈至明徐海潮魏臣兴郭云鹏胡志坚肖建秋梁国红
Owner CNPC BOHAI DRILLING ENG
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