Anti-rotation self-locking rubber plug used for well cementation

A self-locking and rubber plug technology, used in wellbore/well components, earth-moving drilling, sealing/packing, etc., can solve problems such as increasing drilling cost, increasing drilling cycle, casing wall wear, etc., to improve efficiency, The effect of saving drilling time and reducing drilling costs

Inactive Publication Date: 2011-05-25
CNPC CHUANQING DRILLING ENG DOWNHOLE OPERATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The prior art is: the used isolation rubber plug and the floating hoop are basically in plane contact. Therefore, when the drill bit is used to drill the isolation rubber plug, the rubber plug is easy to rotate with the drill bit, and the rubber plug rotates with the drill bit. It will affect the crushing efficiency of the drill bit to the rubber plug, prolong the time for the drill bit to drill through the rubber plug and the matching floating hoop, and thus increase the drilling cycle and increase the drilling cost. It also caused more serious wear and tear, which buried hidden dangers for future oil well production.

Method used

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  • Anti-rotation self-locking rubber plug used for well cementation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The structure of the present invention includes three parts: the upper rubber plug, the lower rubber plug and the floating hoop. Rubber discs 1 and 4 are arranged on the upper rubber plug and the lower rubber plug, and a self-locking core 2 is arranged at the lower end of the upper rubber plug. In order to connect with the self-locking of the lower rubber plug, the self-locking core 2 provided at the lower end of the upper rubber plug is four positive hook teeth 8 distributed according to a 90° phase; The lock core 5, the upper self-lock core 3 of the lower rubber plug is four anti-hook teeth distributed according to the 90° phase, and the lower self-lock core 5 of the lower rubber plug is four positive hook teeth 9 distributed according to the 90° phase; The floating hoop 7 is provided with a floating hoop self-locking core 6, and the floating hoop self-locking core 6 is an anti-hook tooth distributed according to a 90° phase;

Embodiment 2

[0016] The connection of the present invention is: the positive hook tooth 8 of the self-lock core 2 at the lower end of the upper rubber plug is hooked and locked with the anti-hook tooth 8 of the upper self-lock core 3 provided at the upper end of the lower rubber plug, and the lower self-lock core provided at the lower end of the lower rubber plug The positive hook teeth 9 of 5 are hooked and locked with the four anti-hook teeth of the self-lock core 6 of the floating hoop. The rubber discs 1 and 4 set on the upper rubber plug and the lower rubber plug are made of rubber. At this time, the annular surface of the upper and lower rubber plugs in contact with the sleeve is always squeezed and deformed, so that the upper and lower rubber plugs can not only lock each other to prevent rotation, but also rely on the extrusion deformation of the annular surface to produce a sealing effect to withstand the reverse pressure.

Embodiment 3

[0018] A specific application example of the present invention: a test was carried out in a well in Sichuan oil and gas field, the well depth was 1790m, and a casing pipe with an outer diameter of 177.8mm and a wall thickness of 9.19mm was lowered into a casing of 1788m. The displacement and pressure are stable, and there is no backflow phenomenon in the pipe after being pressed in place, and the rubber plug and floating hoop are effectively sealed; the drilling time of the three-split drilling well is 19 minutes with a 152.4mm roller cone bit, compared with the average time of 240 minutes for the same type of well conditions Save 130 minutes;

[0019] In the implementation process, the positive hook teeth 8 of the self-locking core 2 at the lower end of the upper rubber plug can be locked with the anti-hook teeth 8 of the self-locking core 3 at the upper end of the lower rubber plug, and the lower self-locking core 5 at the lower end of the lower rubber plug The positive hook...

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Abstract

The invention discloses an anti-rotation self-locking rubber plug used for well cementation, and belongs to the technical field of manufacturing of downhole tools for oil-gas field well cementing operations. The anti-rotation self-locking rubber plug used for the well cementation comprises an upper rubber plug, a lower rubber plug and a float collar, wherein plastic plates are arranged on both the upper rubber plug and the lower rubber plug; a self-locking core is arranged at the lower end of the lower rubber plug; upper self-locking cores are respectively arranged at the upper end and the lower end of the lower rubber plug; and a float collar self-locking core is arranged in the float collar. An automatic engagement self-locking mode is adopted; the anti-rotation self-locking rubber plug used for the well cementation is designed; the problem that the crushing efficiency of a drill on a rubber plug is influenced because a rubber plug is rotated along with the drill when implementing a drill isolated rubber plug is solved; and the anti-rotation self-locking rubber plug used for the well cementation has the characteristics of interlocking the upper rubber plug and the lower rubber plug.

Description

technical field [0001] An anti-rotation self-locking rubber plug for well cementing is used for oil and gas well cementing operations in oil and gas development, and belongs to the technical field of manufacturing downhole tools for oil and gas field cementing operations. Background technique [0002] After the drilling work is completed, in order to ensure smooth production in the future, it is necessary to carry out cementing operations, but before the implementation of the cementing operation, because there is still drilling mud in the well that has not returned to the ground, the conventional cementing operation is carried out, and the cementing operation is carried out. Before, it was necessary to use a rubber plug to separate the mud remaining in the casing from the cement slurry to be injected, so as to avoid the mixing of drilling mud and cementing slurry, so as to prevent the cementing slurry from being polluted by drilling mud The problem occurs; the isolation rubb...

Claims

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Application Information

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IPC IPC(8): E21B33/134
Inventor 先勇张毅超杨万忠周正邹祥富
Owner CNPC CHUANQING DRILLING ENG DOWNHOLE OPERATION
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