Pitching pressure-out opening oil tube constant-pressure floating valve

A technology of tubing and float valves, which is applied in wellbore/well valve devices, wellbore/well parts, earthwork drilling and production, etc., and can solve the problems of restricting the development of tubing string technology under pressure, such as single style and complex structure of tubing under pressure and other problems, to achieve the effects of reducing well control accidents, reasonable structure and simple operation procedures

Active Publication Date: 2012-07-25
CNPC XIBU DRILLING ENG
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  • Abstract
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Problems solved by technology

[0003]The present invention provides a ball-throwing pressure-holding open oil pipe constant pressure float valve, which overcomes the above-mentioned deficiencies in the prior art, and can effecti

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  • Pitching pressure-out opening oil tube constant-pressure floating valve
  • Pitching pressure-out opening oil tube constant-pressure floating valve

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Embodiment Construction

[0016] The present invention is not limited by the following examples, and specific implementation methods can be determined according to the technical solutions of the present invention and actual conditions.

[0017] In the present invention, for the convenience of description, the description of the relative positional relationship of each component is based on the description attached to the description. figure 1 For example, the positional relationship of front, rear, top, bottom, left, right, etc. is determined according to the layout direction of the drawings in the description.

[0018] Below in conjunction with embodiment and accompanying drawing, the present invention will be further described:

[0019] as attached figure 1 As shown, the ball-suppressing open oil pipe constant pressure float valve includes a body 1, a valve core 3, a torsion spring 6, a valve 7 and a basket 8; The matching boss 14, the outer wall of the concave platform 13 and the inner w...

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Abstract

The invention relates to the technical field of blowout preventers in oil tubes in underbalance well completion tubing operation, in particular to a pitching pressure-out opening oil tube constant-pressure floating valve, which comprises a body, a valve spool, a torsion spring, a valve and a bucket. A concave platform is arranged on the lower portion of the body, a convex platform matched with the concave platform is arranged on the upper portion of the bucket, the outer wall of the concave platform and the inner wall of the convex platform are fixedly mounted together, the valve spool is fixedly mounted inside the concave platform through a grooving flat end constant-pressure locking nail, and the outer diameter of the valve spool is matched with the inner diameter of the body. The floating valve is reasonable and compact in structure and convenient in use, high-pressure oil and gas flow is effectively prevented from blowing out through an oil tube by the aid of the valve, possible well control accidents in the underbalance tubing operation are decreased, a blowout prevention tool in a pressure tubing is improved, and the floating valve achieves the purposes of simple operation procedures, convenience in use, low cost, safety and reliability.

Description

technical field [0001] The invention relates to the technical field of an oil pipe blowout prevention device in an underbalanced well completion downhole oil pipe operation, and is a pressure-opening type oil pipe constant-pressure float valve that throws a ball. Background technique [0002] When performing underbalanced completion downhole tubing operations, the pressure of the bottom hole fluid column is lower than the pressure of the formation pore fluid, the formation fluid enters the wellbore in a controlled manner, and the oil and gas return from the tubing or the annular space of the oil casing. The injector controls the upward return of the fluid. If no blowout prevention measures are taken in the tubing, the normal construction will be affected at least, and well control accidents will occur at the worst. The technology of snubbing tubing in workover operations is developing rapidly, and various oilfields prefer snubbing tubing technology. However, the tubing plugs...

Claims

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Application Information

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IPC IPC(8): E21B34/06
Inventor 田军张彦龙侯维琪王岷君王超
Owner CNPC XIBU DRILLING ENG
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