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Casing device for reducing casing shear deformation and using method thereof

A casing device, shear deformation technology, applied in casing, drill pipe, earth-moving drilling and other directions, can solve the problem of not being able to run tools, and achieve the effect of reducing workload, convenient installation and simple process

Active Publication Date: 2022-04-08
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects in the prior art, and provide a casing device and its application method for reducing the shearing deformation of the casing. The casing is deformed to solve the problem that the working tool cannot be lowered

Method used

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  • Casing device for reducing casing shear deformation and using method thereof
  • Casing device for reducing casing shear deformation and using method thereof
  • Casing device for reducing casing shear deformation and using method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] A casing device for reducing casing shear deformation and its use method, such as Figure 1-3 As shown, the casing device is set in the wellbore where the fracture zone 7 is located, and includes a casing 1, an upper centralizer 2 and a lower centralizer 5 arranged on the outer walls of both ends of the casing 1, and the casing 1 The outer wall is provided with a metal layer 3 , and the outer wall of the metal layer 3 is provided with a water-swellable rubber layer 4 .

[0040] The inner wall of the water-swellable rubber layer 4 engages with the outer wall of the metal layer 3 and is fixed to the outer wall of the metal layer 3 by bonding; the outer wall of the metal layer 3 is in a spiral shape. The metal layer 3 is formed by spirally winding a metal strip with a convex cross-section on the outside of the sleeve 1 , and the water-swellable rubber layer 4 is formed by spirally winding the rubber strip meshed with the metal layer 3 on the outer layer of the metal layer ...

Embodiment 2

[0050] Based on Embodiment 1, between step 1) and step 2), the following steps are also included: reaming the wellbore at the location of the fracture zone 7, and the inner diameter of the wellbore after reaming ensures that a thicker cement sheath can be formed at this location ; The expanded outer diameter of the water-swellable rubber layer 4 is smaller than the inner diameter of the wellbore after reaming.

Embodiment 3

[0052] Such as Figure 4 As shown, the metal layer 3 and the water-swellable rubber layer 4 in this embodiment are bellows, and the rest of the structure and usage method are the same as those in Embodiment 1.

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Abstract

The invention relates to the technical field of oil and gas exploitation, and discloses a casing device for reducing casing shear deformation and a method for using the casing device. The upper centralizer and the lower centralizer on the outer walls of both ends of the pipe, the outer wall of the casing is provided with a metal layer, and the outer wall of the metal layer is provided with a water-swellable rubber layer; the use method of the casing device includes the following steps: 1) Determine the wellbore at the location of the fractured zone in the formation by the microseismic method; 2) Run the casing device, and the casing device reaches the location of the fractured zone, and perform water circulation on the wellbore, so that the water-swellable rubber layer expands; 3) Inject cement into casing and wellbore annulus to complete the cementing operation; in reducing casing shear deformation of the present invention, by increasing the thickness of the cement sheath and adding a radially compressible metal layer and a water-swellable layer, it can Effectively prevent or reduce casing shear deformation caused by formation slippage.

Description

technical field [0001] The invention relates to a casing device for reducing the shearing deformation of the casing and an application method thereof, which belong to the technical field of oil and gas exploitation. Background technique [0002] The complex structural geological conditions in oil and gas development make formation faults and fractures very developed, especially in the process of multi-stage fracturing, after the fracturing fluid enters natural fractures or weak bedding planes, it is easy to cause faults to slip and cause casing damage. Shear deformation. The results of microseismic measurements show that 53.6% of the deformation points of casing deformation wells in some areas are located in natural fractures, indicating that the shear caused by fault slip is the main form of casing deformation. After the casing is damaged, the fracturing plugging bridge or other downhole tools are blocked and cannot reach the predetermined position, resulting in prolonged ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B17/00E21B17/10
CPCE21B17/00E21B17/1042E21B17/1078
Inventor 祝效华雷清龙童华
Owner SOUTHWEST PETROLEUM UNIV
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