WIRELINES and WELL-SERVICE STRANDS

Transcription

1 WIRELINES and WELL-SERVICE STRANDS High quality wire and strand for the oil and gas industry. Wirelines Minimum Breaking Loads Diameter in mm HT Carbon EHT Carbon ZERON 100VHX ,950 1,980 1,350 1, ,300 2,580 1,760 2, ,500 2,730 1,900 2, ,450 3,660 2,500 3,300 Weight per Unit in mm HT Carbon/EHT Carbon per 1,000ft Steel per 1,000ft ZERON 100VHX s per 1,000ft Well Service Strands Minimum Breaking Loads Weight Minimum Breaking Load Carbon Steel in /1000 /1000 3/ ,960 3,990 7/ ,610 5,400 1/ ,640 7,030 5/ ,490 11,000 Weight per Unit Weight Minimum Breaking Load Carbon Steel in /1000 /1000 3/ ,170 4,940 7/ ,370 6,500 1/ ,200 8,640 5/ ,550 13,560

2 ZERON 100 (UNS S32760) SLICKLINE DATA SHEET High Quality Wire and Strand for the Oil and Gas Industry ZERON 100 VHX is a super duplex stainless steel available in all wire diameters that has high mechanical properties whilst retaining good ductility. The alloy has excellent resistance to chloride and sulfide stress corrosion cracking, acid corrosion and crevice corrosion, making it suitable for use in many environments. Due to its high strength, ZERON 100 also exhibits excellent resistance to abrasion and high resistance to fatigue and corrosion fatigue. ZERON 100 has a low coefficient of thermal expansion that is similar to ferritic steels. Further information on any of these properties, or advice on the use of ZERON 100 is available on request. CHEMICAL ANALYSIS C Si Mn S P Cr Ni Mo Cu N W Fe Min Bal Max MECHANICAL PROPERTIES PREN = Cr% Mo% + 16 N% = 40min PRENW = Cr% (Mo% + W%) + 16 N% = 42.15min Wire Diameter Minimum Breaking Load (f) 1,920 2,500 3,300 4,050 5,150 Minimum Tensile Strength ksi (MPa) 261 (1,800) 261 (1,800) 276 (1,900) 254 (1,750) 254 (1,750) 0.2% Proof Strength (% of TS) Elastic Limit (% of TS) Elongation on 100mm GL (Typical %) Torsion on 8 GL (Typical) Minimum Bend Diameter 120xd 120xd 120xd 120xd 120xd

3 PHYSICAL PROPERTIES Mean Coeff. of Thermal Expansion F, C F, C F, C Resistivity 68 F, 20 C 212 F, 100 C 302 F, 150 C 392 F, 200 C 482 F, 250 C 572 F, 300 C Modulus of Elasticity (GPa) 20 C 10-6 in/in F 10-6 K -1 Thermal conductivity F, 20 C F, 100 C F, 150 C 300 F, 200 C 400 F, 250 C 10-6 ohm.m F, 300 C Specific heat 68 F, 20 C 100 F, 100 C 200 F, 150 C 300 F, 200 C 400 F, 250 C 500 F, 300 C Wm -1 K Poisson s ratio 0.32 Magnetic permeability 29 Density (g/cm 3 ) Btu/ F Btu/hr/ft/ F J kg -1 K CORROSION In addition to excellent mechanical properties ZERON 100 Very High Strength (VHX) wirelines have exceptional corrosion resistance. In sweet wells, ZERON 100 VHX wirelines are very resistant to corrosion by CO 2, irrespective of chloride levels, up to high temperature (> 200 C). In sour wells, the main concern is failure by sulfide stress corrosion cracking (SSCC). ZERON 100VHX wireline has been demonstrated to resist cracking in sour, condensed waters with 0.4 bar partial pressure of H 2 S. Produced waters have a higher ph, but also higher chloride content; and ZERON 100VHX wireline resisted cracking in 0.4 bar partial pressure of H 2 S. It therefore has applications in many sour wells. The performance of ZERON 100 VHX is similar to that of 6% Mo austenitic alloys at around 100 C, but it is superior at elevated temperatures, where the 6% Mo austenitic alloys are restricted to low chloride concentrations with high H 2 S levels by NACE MR0175/ ISO Another important consideration for wireline users in marine atmospheres is atmospheric corrosion during storage as some of the failures of wireline in service are due to corrosion that has occurred during storage between uses. This corrosion acts as a local stress raiser that can lead to wire fracture in use. ZERON 100 VHX has exceptional resistance to corrosion in storage, even when tight crevices occur, so preventing premature failure. ZERON is a registered Trademark of Weir Materials Ltd and is used under licence by Weir Materials & Foundries

4 Schematic of areas of use for ZERON 100 Wirelines in sour brines Please contact Weir Materials & Foundries for further information on your particular application. All possible care has been taken in the preparation of this document, but Weir Materials & Foundries accepts no liability for any inaccuracies that may be found. Weir Materials & Foundries reserves the right to make changes without notice both to this publication and to the product which it describes.

5 Weir Materials & Foundries Park Works, Materials Foundries Grimshaw Lane, Tel: +44 (0) Tel: +44 (0) Newton Heath Fax: +44 (0) Fax: +44 (0) Manchester M40 2BA A COMPARISON OF ZERON 100 AND 6% Mo TYPE AUSTENITIC STAINLESS STEEL WIRELINES. ZERON 100 is a superduplex stainless steel with a 50/50 austenite/ferrite microstructure, while 6%Mo alloys are fully austenitic. The nominal compositions of the alloys are shown below. ALLOY NOMINAL COMPOSITION (WT%) PREN* PRENW* Fe Cr Ni Mo N Cu W 6% Mo Bal ZERON 100 Bal >40 >42 Bal = balance, *PREN = % Cr x % Mo + 16 x % N, + PRENW = % Cr x (W+Mo) + 16 x %N The Pitting Resistance Equivalent number, or PREN, is an empirical relationship that has been shown to be related to the resistance to localised corrosion in chloride containing solutions. The higher the PREN the greater the resistance to localised attack. The PRENW equation includes tungsten, which plays a similar role to molybdenum in preventing localised attack by chlorides, increasing the performance of ZERON 100. Microstructure is as important as PREN. In aerated seawater a duplex alloy needs a PREN >40 to resist crevice corrosion while a 6% Mo alloy needs a PREN >43. (Kovach and Redmond, Paper 267, Corrosion 93, NACE International). ZERON 100 wireline will resist sulphide SCC up to at least 0.5bar H2S under normal conditions, at all chloride concentrations. 6% Mo alloys will resist high levels of H 2 S ONLY if the chloride <5,000mg/l. At normal chloride levels (50,000 to 150,000mg/l) 6% Mo is, at best, only equal in corrosion resistance to ZERON 100 in sour brines. 6% Mo alloys contain more nickel and molybdenum than ZERON 100 and, hence, will be more expensive. ZERON 100 has a higher breaking strain than 6% Mo alloys because of its duplex microstructure. Registered trademark of Weir Materials and Foundries TECH4823.doc, July 2006 All possible care has been taken in the preparation of this document, but Weir Materials & Foundries accepts no liability for any inaccuracies that may be found. Weir Materials & Foundries reserves the right to make changes without notice both to this publication and to the product that it describes