What is
API 11B Steel Sucker Rod?
Steel
sucker rod is a kind of long slender bar used in pumping well, common benchmark
is API SPEC 11B (Specification for sucker rods, polished rods and
liners, couplings, sinker bars, polished rod clamps, padding boxes, and pumping
tees). It connects with polished bar above, and pumps at the underside. The
function is to transmit the power.
Steel sucker rods length in general at 7.6 or 8
meters long, material usually use high-carbon steel and surface plating with
hard chrome, in the tubing connected one by one until the piston at the oil
layer to pump oil with up-and-down progress.
Steel
sucker rod scope
The standard API 11B for sucker rod define the
specifications for a size, mechanical property, inspection and test methods.
Covers products general sucker rod, fiber-strengthen plastic sucker rod,
reducing coupling, polished coupling, and polished bar.
Steel
Sucker Rod Classification
Ø
Ordinary sucker rod cover:
Grade C, D, K, KD sucker rod.
Ø
High-strength sucker rods
covers: Grade H sucker rod, include 3 types: HY, HL, KHL.
Ø
Unique sucker rods: Hollow
sucker rod, steel rod.
Ø
Consecutive sucker rods:
Steel rod.
Ø
Screw pump used unique
sucker Rod: Taper thread sucker rod, plugging-type sucker rod.
Ø
Fiberglass reinforced plastic
sucker rod: Fiber plastic sucker rod.
Ø
Flexible sucker rod: Carbon
fiber well-matched material sucker rod, wire rope sucker rod.
Ø
Other sucker rod: Electric
sucker rod.
Grades
and types
Grade C: Covers steel rod used in light-to-medium
load and noncorrosive or anti-corrosive oil well. Manufactured an AISI 1530 Mod
steel.
Grade K: Covers steel rod used in corrosive
light-to-medium load oil well. Manufactured in AISI 4621 Mod steel.
Carbon steel Grade D: Steel rod used in noncorrosive
or anti corrosive medium-to-heavy load oil well. And Manufactured a AISI 1530
Mod low-alloy steel.
Alloy steel Grade D: Covers steel rod used in
noncorrosive & anti corrosive medium-to-heavy load oil well. Manufactured an
AISI 4142 Mod.
Grade KD sucker rod: Covers sucker rod which a both
have anti-corrosion properties of grade K, & mechanical properties of grade
D. Manufactured in AISI 4320 Mod steel.
Grade D special sucker rod: Covers steel rod which
used in medium-to-heavy anti corrosive oil well. Manufactured a 4330 Mod steel.
Grade H sucker rod: Covers steel rod which used in
heavy-to-overweight load oil well.
Type HL sucker rod: Covers steel rod which by
selecting appropriate material & process achieve grade H.
Type HY sucker rod: Covers steel rod which through
quenching process to make the mechanical properties achieve grade H.
What is a
Pony Rod?
Pony rod is a kind of sucker rod, shorter than usual
length of a sucker rod. Pony rod used to make up a sucker rod string of required
length, which connects a piston pump to surface of oil well. The rod connect
with thread from both ends, diameters are in general at 3/4 inch, 7/8 inch and
1 inch. Due to great tensile, pony rod apply in various circumstances. Such as
high loads, corrosive environment so it can control over the rod friction well
again. As it manufactured in AISI 1530 Mod, pony rod has perfect performance
even in deep oil well.
The pony
rod is a key part of the artificial lift system, for this reason it
should be done by different heat treatments to maximize performance to anti
weariness. Commonly pony rod have three main grades: Grade C, K & D and
these grades are classified by different tensile strength. For instance, grade
C has a maximum tensile strength of up 115,000 psi whereas grade K has
maximum tensile strength of up to 140,000 psi. The pony rod is placed
beneath the polished rod of the rod string to prevent the string from falling down.
In addition, the old rods should not be used for load carrying part to avoid
any mistake
Thank You
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