Frequently Asked Questions

Q: How do you expand pipe?

A: SET® technology is the result of a cold-working process that permanently deforms the pipe expanding the steel beyond its elastic limit into the plastic region of the stress-strain curve.

Q: What type of pipe is used in SET® systems?

A: SET® pipe called EX-80, has metallurgical composition allowing for greater ductility while retaining strength properties. Post-expansion properties are similar to those API L-80 material. Enventure utilizes electric resistance welded (ERW) pipe, which provides greater uniformity of wall thickness and ovality, required for consistent expansion results.  

Q: What preparation has to be completed before the system can be run?

A: In the openhole, the wellbore section is drilled and often underreamed. In cased-hole applications the existing casing is cleaned to ensure there is no interference with the expansion.

Q: How does the pipe expand once it is downhole?

A: The housing at the bottom of the SET® system, known as the launcher, contains an expansion assembly as well as a float assembly and is typically constructed of thin-wall, high-strength steel. A solid cone is driven through the expandable tubulars using hydraulic pressure or mechanical force, or a combination of both, which enlarges the pipe radially. The cone moves up from the bottom of the liner through the EX-80 pipe which has a proprietary coating on the inside diameter and proprietary pin-up connections. This bottom-to-top expansion process is completed when the anchor hanger seals the expandable liner against the previous pipe string referred to as the base casing.

Q: How does expansion affect the pipe?

A: During the expansion process, the enlargement of the pipe diameter causes the overall pipe length to shorten from the top as a result of material balance. As the liner is expanded, its outer diameter (OD) increases significantly, while the wall thickness decreases only slightly. This preserves the greatest post-expansion burst and collapse values possible.

Q: What expandable systems are available?

A: A variety of systems are available for installation in casing sizes ranging from 4-1/4 inch to 20 inch. See the SET® Chart for a partial list and contact your local Enventure representative to learn what systems are available to help you meet your objectives.

For a DataSheet on the expansion process, download How SET® Technology Works.

Q: How is SET liner cemented?

A: The SET liner's cement job is similar to that used with a conventional liner. The volume of cement that is pumped will fill 75% of the post-expanded liner's annulus. Retardant is added to the cement slurry to allow time for the expansion process. When running a shorter liner, the entire annulus can be cemented. 

Q: How long does expansion take?

A: The expansion cone moves approximately 30 feet per minute. Actual expansion averages 4 to 6 stands per hour, depending on connection time and workstring racking. Unless an unusually long liner is being expanded, an average expansion takes 4-12 hours. 

Q: Does the metallurgy of the SET® liner change during expansion?

A: The cold working of the SET® liner actually increases the yield strength of the pipe. SET® tubulars have a post-expanded yield of 80ksi. 

Q: What is the cone made of?

A: The cone is comprised of D2 steel.

Q: What Equipment is used to drill out?

A: Drill out has been done with standard roller cone bits, PDC bits, and mills - compatible with the maximum drift size of the SET liner

Education
We'll bring you lunch and tell you how our Expandables can provide solutions for your well construction, casing integrity, and well completion/recompletion challenges.

You'll go away with a new tool for your tool kit!