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Downhole Coiled Tubing for Control Line and Chemical Injection

Alloy 316 seam-welded pressure tubing

Alloy 316L is a chromium-nickel austenitic stainless steel with an addition of molybdenum and reduced carbon content. The addition of molybdenum provides improved resistance to pitting and crevice corrosion in environments containing halides such as chlorides when compared to so-called conventional 18 chromium 8 nickel austenitic stainless steels such as 304L. The reduced carbon content minimizes harmful chromium carbide precipitation during welding and thereby improves resistance to intergranular corrosion. Austenitic stainless steels such as 316L are susceptible to stress corrosion cracking (SCC) in environments containing chlorides and other halides. Alloy 316L is generally used in oil and gas production environments which do not contain oxygen and have limited amounts of chlorides and hydrogen sulfide. MEILONG TUBE uses expert system software to assist customers in their selection of alloys for oil and gas environments.

Alloy 316 seam-welded pressure tubing

 

Alloy 316L is a chromium-nickel austenitic stainless steel with an addition of molybdenum and reduced carbon content. The addition of molybdenum provides improved resistance to pitting and crevice corrosion in environments containing halides such as chlorides when compared to so-called conventional 18 chromium 8 nickel austenitic stainless steels such as 304L. The reduced carbon content minimizes harmful chromium carbide precipitation during welding and thereby improves resistance to intergranular corrosion. Austenitic stainless steels such as 316L are susceptible to stress corrosion cracking (SCC) in environments containing chlorides and other halides. Alloy 316L is generally used in oil and gas production environments which do not contain oxygen and have limited amounts of chlorides and hydrogen sulfide. MEILONG TUBE uses expert system software to assist customers in their selection of alloys for oil and gas environments.

 

Application

Alloy 316L seam welded pressure tubing in the heat treated condition is typically used in oil and natural gas wells for applications including hydraulically actuated surface-controlled subsurface safety valves, chemical injection, and instrumentation. In such applications, it is commonly referred to as control line tubing.

 

The tubing is generally deployed by strapping it to the outside of the production casing. It may be encapsulated and can be included along with other pressure tubing or TEC and mechanical components, such as bumpers, within a flatpack. The tubing is frequently supplied as 5,000 to 35,000 ft. coils on a wooden or steel reel, depending on size.

 

Tubing type

Seam-welded tubing

Long lengths greater than 5,000 ft is achievable between orbital welds.

 

Non-destructive testing

Eddy current testing

Radiographic testing

Hydrostatic testing

 

Standards and specifications

Tubing Specification PTM-TS-004, Alloy 316L Tubing for Control Line Applications

 

ASTM A269, Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for General Service

 

Meets the material limits for 316L austenitic stainless steel listed in ISO 15156-3, Table A.2

 

Chemical composition

C

Mn

P

S

Si

Cr

Ni

Mo

N

Cu

Fe

≤0.030

≤2.00

≤0.040

≤0.017

≤0.75

≤16.0-18.0

≤10.0-14.0

≤2.00-3.00

≤0.10

≤0.50

Bal.

 

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