Expandable Tubular Technology Solutions

1. Problems the industry faced
With the increase of deep well and ultra-deep well developing, drilling is becoming more and more difficult, and oil companies are more and more sensitive to input-output ratio. Problems during drilling and oil recovery:
ⅰ.The deep well and complex well are easy to meet the complex formation of leakage, high pressure and so on.
ⅱ.The completion casing of the conventional sidetrack well is too small, the tail pipe is easy to leak, and the production is limited in the later stage.
ⅲ.The old well casing is seriously damaged, and the traditional technology cannot solve the technical problems of long well section and multi-well leakage.
ⅳ.Because of the small internal diameter, the conventional screen is easy to cause sand blockage and other problems.

Expandable well technology solves the above problems and becomes one of the core technologies of the oil drilling industry in the 21st century.
2. Introduction of Expandable Tubular Technology
Expansion pipe is a kind of casing made of low carbon steel through special treatment, due to the low carbon content, the expansion pipe is more flexible than the normal casing. Expandable Well Technology is to remove the expandable pipe into the well, through the method of cold extrusion, the pressure or tension provided by mechanical or hydraulic pressure causes the expansion tool to expand the inner diameter or outer diameter to the size of the design by expanding the hole in the casing pipe. In simple terms, the expansion tube technology is to transfer the cold expansion process from the factory workshop to the complicated working conditions of thousands of meters underground.
At present, the expansion pipe is divided into two types: expansion casing and expansion screen.

Advantages of expandable tubular technology:
ⅰ.It can effectively solve the well wall stability problem of complex formation.
ⅱ.Reduce the borehole taper, increase the depth of the casing, and enlarge the well completion size.
ⅲ.The size and casing number of the upper hole can be reduced.
ⅳ.Repair the damaged part of the casing.
ⅴ.The completion has greater flexibility.
ⅵ.It can improve the sealing effect of the tail pipe hanger.
ⅶ.The cost of drilling can be greatly reduced.
ⅷ.It can replace gravel pack technology and reduce well completion cost.

3. Application of Expandable Casing Technology
3.1 Open hole liner system.
The problems that can be solved are as follows:
ⅰ.Well instability
ⅱ.The problem of pore pressure gradient
ⅲ.The underground salt layer
ⅳ.Tapered well

3.2 Casing liner system
The problems that can be solved are as follows:
ⅰ.Repair casing
ⅱ.Strengthen the casing
ⅲ.Block perforation section

3.3 Open hole clad system
The problems that can be solved are as follows:
ⅰ.Closing the problem section
ⅱ.Plugging out the well layer

3.4 Flexible clad system
The problems that can be solved are as follows:
ⅰ.Repair casing
ⅱ.Block off perforation section.

4. Application of Expandable Screen Technology
The expandable screen sand control technology provides a new method of large diameter hole sand control,and the application of expandable screen in casing well and open hole well is realized.

The problem of traditional screen pipe:
ⅰ.It is almost impossible to transform the oil layer.
ⅱ.The hole around the screen is prone to collapse.
ⅲ.Well wall and formation particles may clog the screen.
The advantages of the expansion screen:
ⅰ.To increase production
ⅱ.Maximize the pipe size.
ⅲ.It is possible to reconstruct borehole support.
ⅳ.Reducing the pressure drop
ⅴ.Reduce screen damage.

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