SS Downhole Pump
Project in Schlumberger
Stainless steels are high-alloy steels that have excellent corrosion resistance in comparison with other steels as they contain more chromium.
Based on their crystalline structure, stainless steels are divided into three groups, namely, martensitic, austenitic and ferritic steels.
A combination of martensitic and ferritic steels forms a fourth group known as precipitation-hardened steels.
Datasheet stainless steel UNS S50100
|Chemical Composition (Weight %)||Mechanical Properties|
|C (％) ≥ 0.10||Density(g/cm³)||7.75|
|Si(％) ≤ 1.00||Elastic modulus(Gpa)||190-210|
|Mn(％) ≤ 1.00||Yield Rp0.2 (MPa)||390|
|P(％) ≤ 0.040||Elongation A (%)||18|
|S (％) ≤ 0.030||Poisson’s ratio||0.27-0.30|
|Cr (％): 4.00 ～ 6.00||Thermal expansion (@ 0-100°C/32-212°F)||11.2 µm/m°C|
|Mo(％): 0.40 ～ 0.65||Thermal conductivity (@ 100°C/212°F)||36.7 x W/m.K|
The produced water in oil wells contains a variety of corrosive substances, such as Saline water, Cl-1, SO4-2, HCO3-1, CO3-2, H2S, CO2, Oxygen, which can cause strong corrosion to the carbon steel pump.
Although stainless steel (S50100, S30400) is extremely resistant to corrosion, it is relatively soft and has very low hardness and strength. Conventional processing methods, such as honing, cannot meet the requirements of the dimensional accuracy of the pump barrel.
In order to solve this problem, we adopt precision rolling process to ensure the precision of stainless steel pump barrel. The stainless steel pump barrel is chrome plated to improve the wear resistance.
Below are the main technical parameters of the stainless steel insert pump:
|Type||Thick wall rod pump||Thin wall rod pump||Tubing pump|
|Bore size (in)||1 1/16~2 1/4||1 1/4~2 1/2||1 3/4~3 3/4|
|Plunger length (ft)||2-24|
|Barrel length (ft)||2-34|
|Material||Barrel||A3: Chrome plate on 4/6 chrome steel|
A6: Chrome plate on austenitic stainless steel
B3: Heavy chrome plate on 4/6 chrome steel
B6: Heavy chrome plate on austenitic stainless steel
|Plunger||D1-D3: Spray metal with Ni/Cu alloy ends|
E1-E3: Spray metal with Nickel plated pin ends and entire length of inside diameter
F1-F3: Spray metal with Nickel plated pin ends and entire length of inside diameter
|Corrosion medium||H2S, CO2, Saline water, Oxygen|