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Material Selection for Oil and Gas Material 2

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Question 4. In order to make electromagnetic measurements while drilling, EMWD, a non-magnetic isolation sub is required at the position of the signal generation. This is located just above the mud motor and the universal bottom hole orientation sub, UBHO, and is part of the drill string. Select a material to be used for this application. Solution Use and Properties An EMWD deice is a downhole sensor. It is attached behind the drill bit. Its primary purpose is to measure environmental contaminants while drilling. As the EMWD is an electromagnetic device a non-magnetic isolation sub is required over it in order to obtain the most accurate data. This non-magnetic isolation sub will be designed to have a relatively long life (at least 20 - 30 times down hole), with appearance (surface finish) not important as it is to go downhole. This isolation sub will also be considered a performance item in terms of cost (cost is not a major factor in its selection). . Safety Conditions The safety criteria for this is low to medium because it is downhole. ?f ? 0.20 KIC ? 120 MPaVm Assumptions - Low to medium corrosive - pressure is constant at 4000 kPa - vibrations are minimal - cost is a major factor Consideration Criteria Primary ...read more.


too low Stainless Steel -AISI 304 Annealed 55 16.2 1.12 14.46428571 6 Cold worked 20 16.2 1.4 11.57142857 8 Stainless Steel -AISI 316 Annealed 55 16.2 1.12 14.46428571 7 Cold worked 45 16.2 1.4 11.57142857 9 Stainless Steel -AISI S20910 Annealed 50 15.6 0.56 27.85714286 2 Cold worked 20 15.6 0.7 22.28571429 4 Stainless Steel -AISI 630 10 ppt hardened 15 17.9 1.91 9.371727749 11 Note: many of the costs were unavailable, therefore to find the difference between the different material types (i.e. Naturalized, Annealed, etc.) were found using constant price factors. The two materials three materials that jumped out at me were AISI 4140 Annealed, AISI 4140 Naturalized, and AISI S20910. When looking at the CCR, we noticed that the best material was AISI S20910. However, we looked closely at the Thermal Conductivity Values (primary condition) of the three metals, we realized that AISI 4140 Annealed and Naturalized had, by far, the highest conductivity. To choose between these two materials, we looked at our other condition, that being the Safety, or ductility. Because AISI 4140 had a higher value ductility factor, therefore we made this our final choice. Question 6 Some large process refinery piping is to be operated at 650 oC under a pressure of 25 psig. ...read more.


Criteria Primary High yield Strength; good ductility Secondary Density must be low, corrosion resistance protects against corrosive elements Other Fatigue; fracture toughness; gatigue resistance; charpy impact energy; strain hardening (greater than 1.2); cost It was difficult to find information on surge tanks as there are diverse uses. However, according to ASME requirements, located a few equations which will aid us in our calculations: ?max = (5/8)*?y ?max = (1/4)*?u to find CCR, we used the following formula CCR = (?y)(?u)(CR)(?f) (? x Cost) Material ?y (MPa) ?u(MPa) ?f % ? (g/cm3) Elastic Modulus (GPa) Corrosion resistance Cost ($/cc) CCR Rank AISI 304L Stainless Steel 205 515 40 8 193 1 5.24 100739.504 2 AISI 316 Stainless Steel 250 415 55 8 193 1.1 5.24 149734.614 1 C17000 -Copper alloy 250 500 45 8.42 185 1 8.19 81569.2621 3 Nickel alloy 400, annealed 240 520 55 8.83 193 1.2 17.34 53795.8438 4 For Corrosion Resistance, 1: Good, 1.1 is Better than good, 1.2 Very Good From the above table, we can see that the best choice of material is AISI 304L is the best choice of material. It has high yield strength with decent ultimate strength. Ductility is excellent and the material is cheap to buy. Also, very good corrosion resistance helps its feasibility. ...read more.

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