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Underwater wellhead reclaiming tool

A technology for underwater wellheads and tools, applied in wellbore/well parts, earthwork drilling and production, etc., can solve problems such as drill pipe breakage, low operating efficiency, and unstable cutting, and achieve radial swing reduction, rapid recovery, and The effect of improving stability and work efficiency

Active Publication Date: 2012-05-30
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the water depth increases, the disadvantages of this traditional down-pressure abandoned well recovery tool are gradually exposed
For example, because the wellhead is under pressure, the drill string tends to swing radially during rotation, resulting in unstable cutting, low operating efficiency, and in severe cases, drill pipe breakage accidents

Method used

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  • Underwater wellhead reclaiming tool
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Examples

Experimental program
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Embodiment Construction

[0029] Taking an underwater wellhead head recovery tool suitable for 18-3 / 4 "wellhead head 9 (with an inner diameter of 473 millimeters) as an example, the present invention will be described in further detail in conjunction with the accompanying drawings.

[0030] refer to figure 1 . The underwater wellhead recovery tool of the present invention is mainly composed of a support base 10, a locking arm 4, a pin shaft 5, a locking arm spring 3, a support cover 2, a support pipe 13 and a rotating lifting assembly.

[0031] refer to figure 2 . The rotary lifting assembly is composed of a rotary housing 6 , a guide cap 8 , a thrust bearing 12 , a compression spring 11 and a spindle 1 . Wherein, the mandrel 1 is a hollow cylinder, and the outer diameter of the mandrel 1 is 203.2 mm. The upper end of the mandrel 1 is provided with a drill internal thread, and the lower end is provided with a drill external thread. An annular shoulder is arranged on the outer wall of the mandrel ...

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Abstract

The invention provides an underwater wellhead reclaiming tool, which is used for cutting and reclaiming an underwater wellhead of an abandoned marine well. The tool mainly comprises a support seat, a lock arm, a pin shaft, a lock arm spring, a support cover, a support tube and a rotating-lifting assembly, wherein the rotating-lifting assembly comprises a rotating shell, a guide cap, a thrust bearing, a spring assembly and a mandrel. The support seat is arranged behind the wellhead; the mandrel drives the rotating-lifting assembly to complete rotating and lifting functions; the lock arm locks the wellhead, so that the mandrel rotates to work in a pulled state; and after the work is finished, the mandrel drives the rotating-lifting assembly to rotate and lift and the lock arm is separated from the wellhead under the assistance of the lock arm spring, so that the separation and reclaim of the wellhead are realized. The underwater wellhead reclaiming tool has the characteristic that the underwater wellhead reclaiming tool is compact in structure, visible in working state, and safe and reliable, and completely meets requirements of marine underwater wellhead reclaiming work.

Description

technical field [0001] The invention relates to the technical field of offshore oil drilling. Specifically, the utility model is a special tool for underwater well head recovery suitable for abandoning wells in ocean drilling. Background technique [0002] In the process of offshore oil exploration and development, after the exploration well is drilled, it needs to be tested and analyzed to see if it can be converted into a production well. If it is judged that it cannot be converted into a production well, the well should be abandoned. In the process of well abandonment, the underwater wellhead system needs to be cut to a certain depth below the mud line, and the upper wellhead head should be recovered to avoid hidden dangers above the mud line. Thereby need a kind of special well head cutting recovery tool. The traditional method of abandoning a well adopts a downward pressure type abandonment recovery tool, that is, the rotary body is directly seated on the upper end s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B31/16
Inventor 侯福祥王辉任荣权胡志坚
Owner BC P INC CHINA NAT PETROLEUM CORP
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