Under-balanced underground casing valve plate and processing method thereof

A casing valve and underbalanced technology, which is applied in the direction of wellbore/well valve device, earthwork drilling and production, wellbore/well parts, etc., to achieve the effect of simple and feasible processing method and increased thickness

Active Publication Date: 2014-11-05
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no literature record about underbalanced downhole casing valve plate and its processing method

Method used

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  • Under-balanced underground casing valve plate and processing method thereof
  • Under-balanced underground casing valve plate and processing method thereof
  • Under-balanced underground casing valve plate and processing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: An underbalanced downhole casing valve valve plate, which is an internal intercept of an eccentric cylinder (outer circle radius R1, inner circle radius R2, eccentricity R12) and two cylindrical surfaces, one of which is The surface (radius R3) is perpendicular to the symmetric plane of the eccentric cylinder, the projection of the intersecting body is an arch, and the rotation axis of the other cylindrical surface (diameter D) is on the symmetric plane of the eccentric cylinder and perpendicular to the axis of the eccentric cylinder, the intersecting body The projection of is a circle.

Embodiment 2

[0020] Embodiment 2: Processing the valve plate of an underbalanced downhole casing valve specifically includes the following steps:

[0021] (1) Take a cylindrical blank, fix the inner cylinder, and rotate the blank to produce the radius size R1 of the outer circle of the eccentric ring;

[0022] (2) Fix the outer cylinder, and rotate the tool to bore out the radius size R2 of the inner circle of the eccentric ring;

[0023] (3) Spot weld a tooling on the outer surface, clamp the tooling with a chuck, and rotate the valve plate to form a bow-shaped outer edge radius R3 on the side of the valve plate;

[0024] (4) Turn over the tooling and clamp it with a chuck, and rotate the valve plate to drive out the diameter D of the circular outer edge of the valve plate.

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Abstract

The invention discloses an under-balanced underground casing valve plate and a processing method thereof. The valve plate is an internal intersection body of an eccentric cylinder and two cylindrical surfaces. The processing method of the valve plate comprises the following steps of: taking a cylindrical blank; fixing an inner cylinder and turning the blank to turn diameter size of an eccentric annular outer circle; fixing an external cylinder and turning a cutter to bore the diameter size of the eccentric annular inner circle; spot-welding a tool on the outer surface and clamping the tool by using a chuck, and turning the valve plate to turn a side face of the valve plate to form an arched outer edge; and clamping the turning tool with the chuck, and turning the valve plate to turn a circular outer edge of the valve plate. More space is remained for subsequent processing of the outer surface and the top side face due to an eccentric structure of the valve plate; meanwhile, overall thickness of the valve plate is increased, so that higher pressure at the bottom of a well can be born; the valve plate can be realized only through normal rotary processing; and the processing method is simple, convenient and practical.

Description

technical field [0001] The invention relates to an underbalanced downhole casing valve plate and a processing method thereof, belonging to the field of downhole tools for petroleum drilling. Background technique [0002] In order to better protect the oil and gas layers, various oil companies require that the underbalanced state at the bottom of the well be maintained during the whole process from opening the oil layer to the completion of the well. This is the so-called whole process underbalanced technology. The downhole isolation technology using casing valves is the most simple and safe technology to realize the whole process of underbalanced drilling, so downhole casing valves have begun to be widely used. [0003] The downhole casing valve is a full-bore casing stop valve, which can be lowered and fixed in the well as an integral part of the technical casing. When it is necessary to trip out during underbalanced drilling, first pull out the drilling tool with pressure...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B34/06
Inventor 李宗清王岩鹏朱焕刚杨德京万秀琦
Owner CHINA PETROCHEMICAL CORP
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