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Hydraulic diameter-variable casing expansion method and apparatus therefor

A technology of expansion and casing, which is applied in the field of oil, gas and water well casing expansion and compression technology and equipment, which can solve the problems of lifting and lowering pipe strings and high labor intensity of workers, and achieves small damage, low labor intensity and danger of workers, and easy operation. convenient effect

Inactive Publication Date: 2011-07-06
李孝勇 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common defect of the above-mentioned technologies is that the lifting and lowering of the pipe string makes the labor intensity of the workers high

Method used

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  • Hydraulic diameter-variable casing expansion method and apparatus therefor
  • Hydraulic diameter-variable casing expansion method and apparatus therefor
  • Hydraulic diameter-variable casing expansion method and apparatus therefor

Examples

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Effect test

Embodiment 1

[0028] Aiming at the above-mentioned method, the present invention provides a device for the expansion and pressure method of the hydraulic variable diameter casing, which includes an expansion and pressure device downhole, a hydraulic pump for providing hydraulic pressure change, a pressure-resistant hose connected to the hydraulic pump to transport liquid, and a transport expansion device. The transmission mechanism of the pressing device is composed. Such as figure 1 As shown in the structural schematic diagram of the equipment used in the present invention, the downhole expansion and pressure device is directly lowered into the deformation of the casing 6 by a steel wire rope 11, and the downhole expansion and pressure device consists of variable diameter expansion head 1, bidirectional hydraulic cylinder in sequence from bottom to top. 2. Casing anchors 3 are connected together. One pressure-resistant hose 4-1 is connected to casing anchor 3, and the other two high-pressu...

Embodiment 2

[0037] Such as Figure 4 As shown in the schematic diagram of the structure of the variable-diameter expansion and pressure head of this embodiment, on the basis of the above-mentioned scheme, the present invention also provides a kind of equipment for the expansion and compression method of the hydraulic variable-diameter casing. The variable-diameter expansion head housing 14' of the head, the outer diameter of the variable-diameter expansion pressure head housing 14' is equal to the standard diameter, and there is a compression spring 13' above the conical head, and several springs are evenly distributed in its center. A cylinder 11' with an inclined plane or an involute surface, the cylinder 11' is connected with the traction rod as a whole, and the steel balls 12' are evenly distributed in front of the K side of the cylinder 11', and are limited to the radial cylindrical hole 16 'Inside, this expansion pressure head is especially suitable for subsidizing pipes. When the s...

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Abstract

The invention relates to a hydraulic diameter variable sheath expansion method and relative device which provides an oil-gas well sheath expansion technique, belonging to the technique for solving the deformation and hurt of oil field sheath. The inventive method comprises: using hydraulic change to realize the expansion head with variable diameter which is arranged at the deformation position orfixing position of said sheath; processing the expansion and retract motions of expansion head to make the inner diameter of sheath after expansion is not less than the standard diameter. And the relative method comprises: a under-well expansion device, a hydraulic pump for supplying the hydraulic change, a pressure-resistant tube connected on the hydraulic pump to transfer the liquid and a transmission device for transmitting the expansion device. The invention has the advantages that: the inner diameter after expansion is not less than the standard diameter, and it has short well maintenance time, easy operation, lower workload and little damage on the deformed sheath.

Description

technical field [0001] The invention relates to a casing expansion and pressure technology and equipment for oil, gas and water wells, in particular to a hydraulic variable-diameter casing expansion and pressure method and equipment, which belong to the subsidy technology for solving the deformation and damage of casings in oil fields. Background technique [0002] During the use of downhole casing in oil, gas and water wells, due to corrosion, crustal movement and other reasons, the casing is often deformed, worn, and the diameter becomes smaller, making the oil and water well unable to work. At present, the main techniques for casing plastic surgery are: pear-shaped plastic surgery, grinding and milling, and explosive plastic surgery. The pear-shaped device shaping technology is to use a pipe string to lower the pear-shaped device to the deformation of the casing, and expand the casing by impact. Its defect is that the expanded casing rebounds due to elastic deformation, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B29/10
CPCE21B43/105
Inventor 李孝勇李一忱
Owner 李孝勇