9th annual sucker rod pumping workshop - alrdc. annual sucker rod pumping workshop renaissance hotel

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  • 9th Annual Sucker Rod Pumping

    Workshop

    Renaissance Hotel

    Oklahoma City, Oklahoma

    September 17 - 20, 2013

    Operational risk management advantages from

    premium Corrosion Resistant High Strength

    polished rods.

    Dean Murney

    NOV Wilson Canada

  • Sept. 17 - 20, 2013 2013 Sucker Rod Pumping Workshop 2

    Failures Everyone wants to reduce them, but they must be identified and then an

    economic solution must be found. One failure type, which can sometimes be

    overlooked is polished rod failures. Most polished rod failures are fatigue failures that

    occur just under the clamp. Most of these are a result of improper placement of

    polished rod clamps, over torqued clamps or misaligned clamps/carrier bars. A paper

    presented at the 41st annual Southwestern Petroleum Short Course in 1994 concluded

    that bending stresses amplified by stress concentrations from polished rod clamps are

    the most significant contributors to polished rod failures.

    In Canada, NOV Wilson has been running a special metallurgy polished rod which has

    proven to reduce fatigue failures due to clamp placement and over torque. This unique

    high strength corrosion resistant polished rod has greater elasticity which handles

    excessive clamping and/or misalignment through the carrier bar. It is also

    homogenous throughout so any damage from scoring does not make it susceptible to

    corrosion attack inside the score.

    With over 40,000 polished rods installed in Canada, case histories will be presented

    which will prove the success in reducing failures with this design.

    Operational risk management advantages from premium Corrosion Resistant High Strength polished rods

  • Sept. 17 - 20, 2013 2013 Sucker Rod Pumping Workshop 3

    Operational risk management advantages from premium Corrosion Resistant High Strength polished rods

    Polished Rod Failures..do we seek complete prevention vs

    or do we better manage the risks.

    Polished rod failures what we know: Are a recognized expense in the rod pumping business the rod

    itself, lost production, the well intervention (worse case a pump pull),

    environmental

    Failures identified as

    1) sealing face failure from wear or corrosion attack

    2) Defined mechanical failure of the rod itself.

  • Sept. 17 - 20, 2013 2013 Sucker Rod Pumping Workshop 4

    Operational risk management advantages from premium Corrosion Resistant High Strength polished rods

    Polished rod failures Sealing Face : loss of effective

    seal area or surface finish - Vertical / horizontal scoring from solids imbedded in the packing or

    solids impingement against the rod body creating a crevice.

    Solutions: - Provide a hard surface finish on the polished rod, suitable for well

    fluids and conditions (Chrome plate, metal spray, hard-kote/treated,

    etc) while ensuring mechanical integrity of the rod is not

    compromised.

    - Avoid packing's with Kevlar strands that could press against the rod

    surface

  • Sept. 17 - 20, 2013 2013 Sucker Rod Pumping Workshop 5

    Operational risk management advantages from premium Corrosion Resistant High Strength polished rods

    Polished rod failures Sealing Face : loss of effective seal area or

    surface finish - Eventual wear of the OD from frictional forces applied from the

    packing, the wear resulting in a dimension whereby existing packing

    can no longer effectively seal. (lack of lubrication due to : high water

    cut? Pumping dry? No grease zerks in stuffing box? No grease

    guns??)

    Solutions:

    - Provide a hard surface finish on the polished rod, suitable for well

    fluids and conditions (Chrome plate, metal spray, hard-kote/treated,

    etc) while ensuring mechanical integrity of the rod is not

    compromised.

    - Polished rod lubricators/oilers, auto-lubers, enhanced routine

    maintenance schedule (grease the packing)

  • Sept. 17 - 20, 2013 2013 Sucker Rod Pumping Workshop 6

    Operational risk management advantages from premium Corrosion Resistant High Strength polished rods

    Polished rod failures Mechanical what we know. Most often a result of using sucker rod coupling, and should be a

    Polished rod coupling.

  • Sept. 17 - 20, 2013 2013 Sucker Rod Pumping Workshop 7

    Operational risk management advantages from premium Corrosion Resistant High Strength polished rods

    Polished rod failures Mechanical what we know.

    Pin Failures:

    - Mechanical advantage of formed thread versus cut thread

  • Sept. 17 - 20, 2013 2013 Sucker Rod Pumping Workshop 8

    Operational risk management advantages from premium Corrosion Resistant High Strength polished rods

    Polished rod failures Mechanical what we know.

    Fatigue failure: - Insufficient mechanical strength for the load applied

    - Corrosion induced stress crack leading to fatigue failure

    - Bend induced stress crack fatigue failure

    - Mechanically induced stress crack (excessive clamping force

    with indentation style clamps)

    - Polished rod in use may be susceptible to these failures due to

    existing mechanical / metallurgical properties of rod

  • Sept. 17 - 20, 2013 2013 Sucker Rod Pumping Workshop 9

    Operational risk management advantages from premium Corrosion Resistant High Strength polished rods Fatigue failures.solutions.

    - Insufficient mechanical strength for the load applied

    Know what you are putting into the well and the load being

    handled.diameter, mechanical strength

    - Corrosion induced stress crack leading to fatigue failure

    Ensure to utilize a Corrosion Resistant rod of suitable strength for

    the application

    - Bend induced stress crack fatigue failure

    Address issues of alignment

    Is rod soft enough to allow some misalignment or

    deformation(elongation)

  • Sept. 17 - 20, 2013 2013 Sucker Rod Pumping Workshop 10

    Operational risk management advantages from premium Corrosion Resistant High Strength polished rods

    Fatigue failures.solutions.

    - Mechanically induced stress crack (excessive clamping force

    with indentation style clamps)

    Is rod soft enough to allow some deformation(elongation) before

    cracking

    - Polished rod in use may be susceptible to these failures due to

    existing mechanical / metallurgical properties of rod

    Find a rod that has mechanical and metallurgical properties that

    incorporates all the solutions

  • Sept. 17 - 20, 2013 2013 Sucker Rod Pumping Workshop 11

    Operational risk management advantages from premium Corrosion Resistant High Strength polished rods

    Polished rod failure management..consideration for a premium rod? Utilize the Pitting Resistance Equivalent test as measure for corrosion resistance vs Metallurgy

    PRE = % chromium + 3.3(% molybdenum) + 16(nitrogen)

    .in order to rank stainless steels and nickel based alloys according

    to their resistance to pitting corrosion the relative FeCl3 test is used.

    In this test, sheet specimens are exposed to 10% FeCl3 solution for

    24 hours. The temperature is Increased in 2.5 degC increments until

    pitting occurs.

    That gives the critical pitting temperature (CPT) or critical crevice

    temperature (CCT)

    Knowing your polished rod metallurgy will provide an idea of corrosion

    Resistance using this baseline while also having good mechanical

    properties.

  • Sept. 17 - 20, 2013 2013 Sucker Rod Pumping Workshop 12

    Operational risk management advantages from premium Corrosion Resistant High Strength polished rods

    120

    110

    100

    90

    80

    70

    60

    50

    40

    30

    20

    10

    0

    C

    25 30 35 40 45 50 55 60 65 70 75

    *alloy 317 LN(1.4439)

    alloy 904 L(1.4539)

    *Cronifer 1925 hMo(1.4529)

    *Nicrofer 3127hMo(1.4562)

    Nicrofer 6020 hMo(2.4856)

    Nicrofer 5716 hMoW(2.4819)

    Nicrofer 5923 hMo(2.4605)

    alloy 316(1.4435)

    *alloy S 34565(1.4565)

    - Stainless steels tested in 10% FeCl3 x 6 H2O solution

    - Ni-base alloys tested in 7 % H2SO4, 3 % HCl, 1 % CuCl2, 1 % FeCl3

    CPT C

    CT

    Critical Pitting Temperature CPT

    Critical Crevice Corrosion Temperature CCT

    PRE = % Cr + 3.3 x % Mo PREN = % Cr + 3.3 x % Mo + 30 x % N

    Comparison of Critical Pitting Temperature (CPT)and Critical Crevice Corrosion Temperature (CCT)

    Pitting Resistance Equivalent

    Tem

    pera

    ture

    VDM 1925 hMo is a austenitic stainless steel product found to be suitable

    as a polished rod with the highest PRE index compared to other

    products on the market.

  • Sept. 17 - 20, 2013 2013 Sucker Rod Pumping Workshop 13

    Operational risk management advantages from premium Corrosion Resistant High Strength polished rods

    Polished rod failure management..consideration for a premium rod? Comparison of corrosion resistance in rod metallurgy

    Thus the pitting resistance of Nitronic 5O equals that of 2205 Duplex.

    = VDM

  • Sept. 17 - 20, 2013 2013 Sucker Rod Pumping Workshop 14

    Operational risk management advantages from premium Corrosion Resistant High Strength polished rods

    Consideration for a premium rod?...The VDM 1925hMo

    polished rod is a product with properties to effectively

    manage the operational risks noted previous.

    Proven

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