presentation i-3 --- upco --- sucker rod factors affecting make-up

7/27/2019 Presentation I-3 --- UPCO --- Sucker Rod Factors Affecting Make-Up

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5thAnnual Sucker Rod Pumping

Wyndham Hotel, Dallas, Texas

,

Affecting Sucker Rod Coupling Make-Up

, . .

Arun Sriraman


2/31

Wh did UPCO erform this ro ect? Marketing research has revealed the fact that there has been a

-

.

Some of the questions which were raised and led us into this

project are as fol lows:

What factors/concepts go into choosing sucker rods?

Are the current displacement values adequate for a proper

make up?

What are some recommended practices for sucker rod-

2


3/31

Brief Histor

60-70% of failures in this industry are directly related

to pin failures.

behavior and knowledge of sound recommended

practices will reduce / eliminate the majority of the

3

.


4/31

Goals of this Presentation Segment 1: Sucker rod characteristics (Toughness studies and

their results)

Segment 2: - Circumferential Displacement & What is it?

- What are its capabilities?

- Need to change it.

- Updated displacement values.

Segment 3: Good recommended practices derived from scientificstudies.

- New Vs re-run displacement

- Torque Variation in the make-up process

4

- Life of a sucker rod


5/31

Ke Sucker Rod Conce ts

ey uc er o arac er s cs

- Stress and strain related to sucker rods

- Yield and Tensile strengths of sucker rods

- Concept of Toughness for different grades

- Toughness as a parameter in choosing the

sucker rod rade for a articular a lication

- Normal and Shear Forces

5


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Stress and Strain

6


7/31

Stress and Strain

- Load carrying capabili ty (Vertical axis)

-sucker rod.

- The load carrying capabili ty and Elongationare two key parameters which needs to be usedin combination (Toughness) in selecting asucker rod.

- Using load carrying capabili ty alone as a factorwill lead to wrong choice of sucker rod grades.

7


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Stress Strain Curves for Sucker

Rod Grades Grade C, K

-

toughness

, ,

- Medium strength and

medium to high toughness.

Grade HS

- High Strength and Low

8


9/31

Novel illustration

grap w c s ows e re a ons p e ween

load carrying capabil ity and elongation is called atoughness curve.

The vertical hei ht of the bars indicates the

relative load carrying capabil ity.

The horizontal width represents the capabil ity of

the sucker rod to elongate.

9


10/31

Results from Tou hness Studies No sucker rod with high

strength and toughness.

Practical consequences

include overloading KD

rods and using HS rods in

harsh environments.

A grade in between KD

and HS having good load

carrying capabil ities and

toughness.

10


11/31

Se ment 2- Circumferential Dis lacementCircumferential displacement:

make-up, between the displaced parts of a vertical line scribed across theexternal surfaces of the box and pin when they are in a shouldered hand

ti ht relationshi rior to makeu .

Minimum Displacement value

Hand tight level (No displacement)

11

Maximum Displacement value


12/31

Verif and Re-establish of CD values

Goal:

Step 1: Study and analyze the achievable loadcarrying capabil ities (design rating) of currentdis lacement values.

Ste 2: What circumferential dis lacementvalues need to be changed (Analysis) to trulyreflect the technological advances made in thisindustr ?

Step 3: Re-establish displacement based on data

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Ste 1 Strain Gau e Testin

13


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Design Rating / Effectiveness of CD values

Conduct Test (Make up sucker rod

and coupling to the respective

displacement values)

Calculate the preload stress

(clamping force) in the undercut OD

Compare the preload stress (PSI)

with the desi n ield of the sucker rod

Compute the values in %

14

e ect veness o t e

design strength ratings of sucker rod).


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Avera e desi n ratin for all sizes of sucker rods

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Results based on desi n ield

16


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Some Practical As ects Need to change displacement values which have lower

.

Loss of displacement 60-65% of pin failures in thisindustry.

ange mos o an an some va ues.

,inferred that CD values of 85-90% of design yield wouldgive maximum load carrying capabili ty from a sucker rod.

17


18/31

U dated 3/4 Dis lacement Values3/4" CD Values - Old Vs New Updated Displacement Values

0.6000

Old CD

New CD

0.4000

0.2000

0.0000

C

New

R

e-run

New

R

e-run

D

New

R

e-run

R

e-run

New

R

e-run

18

C

K

CD

KD

S

SD


19/31

U dated 1 Dis lacement Values

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20/31

U dated CD Cards

Found enough variations between Class D sucker rods. Same

can be inferred between C & K grade of sucker rods.

MOE between different grades of materials. So same

(eg. Class D)

20

This is very essential for optimized run / life of sucker rods


21/31

Se ment 3- A licationsNormal and Shear Strain

A

A - Normal strain (straight pull) acting in a direction parallel to theaxis of the rod body. Normal forces are a very desirable attr ibute

- .

B - Shear strain (twist) acting on the pin which is a detrimentalattribute in a sucker rod-cou lin make u rocess.

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22/31

Se ment 3 - A lications

The thread lubricant was applied only on thethreads of the sucker rods

Wet Face:

The thread lubricant was applied on the threadsand faces of sucker rod and coupling.

The torque, normal and shear strain were

22

and studied between the two scenarios.


23/31


24/31

Results Torque Dry face is 41% more efficient in handling

.

s a resu , e suc er ro p n y e s n s ear ur ng

its make up with a wet face make-up.

From the experimental studies, it can be inferred that

dr face is the onl and best o tion for the a lication

24

for rod coupling make up.


25/31

New vs Re-run Dis lacement Normal strain represents the load

rod

A decrease in Normal Strain (load

carrying capability of the sucker

rod) by 14.06% (7.22 % - 20.90 %)a er repea e ma e ups.

the load carrying capability of asucker rod, there are two

different cards. one for new and

25

one for re-run).


26/31

Tor ue variation in the make u rocess 70% variation in torque values based

u on the choice of thread lubricant

selected.

22.98% in torque values based upon

the usage of sucker rods.

Due to this, it is recommended that

toque should not be used as a

parameter.

Circumferential Displacement must

26

torque providing devices.


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Tor ue variation in the make u rocess

27


28/31

Life of a Sucker RodWhat is the optimal number of make-ups on a sucker rod?

Size No of make ups or runs

3/4 16

1 11

There was extreme face deformation and thread allin after 10and 11th make up on all samples.

Considering all the facts and phenomena, the optimal number of

ma e ups on a suc er ro was exper men a y e erm ne o e .

From a practical standpoint, the load carrying capabil ity of the rod

28

keep track on the usage of sucker rods in the field.


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Conclusion

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30Sept. 15 - 18, 2009

2009 Sucker Rod Pumping Workshop 30


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2009 Sucker Rod Pumping Workshop 31

presentation i-3 --- upco --- sucker rod factors affecting make-up

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