Lube-Tech PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE HPHT
Jet-Lube currently offers a range of tubing and casing compounds which are used to seal joints and prevent seizing, corrosion, galling. Such casings are inserted after drilling to ensure the integrity of the well bore. In high temperature high pressure applications these compounds would be expected to function despite adverse conditions.
The goal therefore is to extend the performance of the ECF product range to reliably function at higher temperatures and / or higher pressures whilst maintaining best in class environmental performance. The closest comparable environmental grade, Seal-Guard ECF, operates up to 140°C, existing formulation attempts resulted in a loss in performance for more critical and extreme applications. The properties of Lead based API modified are well documented in the industry and favoured by many operators. Despite the obvious heavy metal toxicity of lead it has been used in casings throughout the industry for a great many years. During this time it has displayed excellent anti-welding and sealing properties and its coefficient of linear expansion is greater than that of the alloys used in the drilling industry. This
No.108 page 4
aids the sealing properties at elevated temperatures. However, given increasing bio-toxicity & bioaccumulation concerns, particularly in reference to OSPAR compliance (lead listed by NSF on its list of priority substances) Jet-Lube has developed a number of dry lubricants to replicate the properties of lead in anti-seize compounds namely graphite, talc, calcium fluoride and micronized fibres. With no heavy metal content these products offer a much improved bio-toxicity rating and have been approved by European authorities for offshore use.
Fundamentally biodegradable products are intrinsically unstable, introducing increased stress factors like extreme temperatures and pressures accelerate degenerative process such as oxidation, nitration, cracking etc. Hence the HPHT had to be formulated to safeguard thermal stability. More generally genetic modifications of specific vegetable oils has led to some enhanced thermal stability. Whilst vegetable oils have proven functionality with existing ECF products an ester / PAO blend was optimised with high carbon chain lengths for enhanced performance. By adapting a blend of specially synthesised oils a proprietary formulation was optimised to deliver intrinsic thermal rigidity.
LUBE MAGAZINE NO.137 FEBRUARY 2017
29
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56
