TWM%20Basic%20Steps%20to%20%20%20%20%20%20Perform%20Valve%20Check%20Load%20Test.

1
TWM Basic Steps to Perform Valve Check
Load Test.
Echometer How To

• by
• Echometer Company

Reference Well Analyzer QuickRefs,
http//www.echometer.com/support/quickrefs/index.h
tml
2
Valve Check Load Tests Answers the Following
Questions

1. What rate does the Traveling Valve Leak?
2. What is the condition of the traveling valve, the
   pump barrel and plunger and the tubing string?
3. Is the fluid being held in the tubing?
4. Does the Standing Valve Leak?
5. Are the rod string lengths correct?

3
Stop on the Upstroke to Monitor for Leakage from
the Tubing into the Pump
TV Check Load Test weighs the rod string buoyed
in tubing fluid plus the fluid load acting on the
traveling valve (across plunger).
4
Stop on the Down Stroke to Monitor for Leakage
from the Pump into the Casing
SV Check Load Test weighs the rods in air reduced
by the buoyancy of the tubing fluid on the rod
string.
5
Use Any of these Dynamometer Transducers to
Determine a Valve Check Load Test
6
Accuracy of Acquired Load Data Depends on Type
of Load Cell Used

• Portable load cells are calibrated and accurately
  determine polished rod loads.
• The PRT acquired loads can drift and make Valve
  Check Load Tests difficult to interpret.
• Error in the measured loads are introduced if the
  carrier bar and clamp do not uniformly contact
  the load cell.
• Donut load cell should have a spacer and
  spherical washers to ensure the polished rod load
  is centralized on the load cell.

7
Connect the cables to Well Analyzer.
Far end on the coiled cable is attached to the
25-foot Y-cable or Straight cable, that is
connected into the MAIN INPUT on the Well
Analyzer.
8
Turn on Well Analyzer and wait for GREEN LED.
9
Turn on the computer.
10
Start TWM in Acquire Mode

• 1. Select the Equipment Check tab.
• 2. The display of internal battery voltage and
  battery temperature indicate that the computer is
  communicating with the well analyzers internal
  electronics and sensor measurements may be
  acquired.

11
TWM Software F3 to Select Well

• 1. Open Base Well File for the well where data
  is to be acquired. Use New to create a Base
  Well File if one does not exist.
• 2. For acoustic surveys be sure to enter at
  least avg. joint length, pump and formation
  depths.
•  

12
Select Wellbore Tab to Verify Data

• 1. From the Base Well File select the Wellbore
  Tab and verify the well data is representative.
• 2. For Dyno surveys be sure to enter Rod Type,
  Rod Length, Rod Diameter, Pump Plunger Dia., Pump
  Intake, Polished Rod Diameter, fluid gravities,
  and production rates.

13
Save Changes to Base Well File

• 1. Click Save button to be sure to save changes
  to the base well file.
•  

14
Select Type of Data Acquisition Test

• 1. Tap F4 to Select Test type to be acquired.
• 2. Click the Dynamometer Tab to indicate that
  Dynamometer data will be acquired.
• 3. Click Alt-2 to select the Valve Check Load
  Test
• 4. Select F5 to Acquire Data

15
Read Instructions for Performing the Traveling
and Standing Valve Test

• 1. After choosing the Select Test option F4
  the operator is presented with the instructions
  performing the traveling and standing valve test.
• 2. Click the Load tab to begin displaying
  data.

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Tap Alt-S to Start Data Acquisition
17
Traveling Valve Check Procedure
The traveling valve check load test is taken
during the upstroke by gently using the brake to
bring the pumping unit to a stop about ¼ from the
top of the stroke.
18
Perform Two Traveling Valve Checks
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Upstroke TV Check Load Test

• 1. Pumping cycle was interrupted on the
  upstroke when SV is open and TV is closed for a
  traveling valve check load test.
• 2. Static pressure above and below the
  standing valve are equal.
• 3. Acquired TV load the weight of the rods
  buoyed in fluid plus the differential fluid load
  on the plunger.

2500 psi
200 psi
200 psi
20
Standing Valve Check Procedure
Standing valve check load is taken during the
down stroke by gently using the brake to bring
the pumping unit to a stop about ¼ from the
bottom of the stroke.
21
Perform Two Standing Valve Checks
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Down Stroke SV Check Load Test

• 1. Pumping cycle was interrupted on the down
  stroke when the TV was open and SV was closed for
  a standing valve check load test.
• 2. Static pressures across the plunger are
  equal for SV Check Load (shown).
• 3. Acquired SV load is the weight of the rod
  string buoyed in the tubing fluid.

2500 psi
2500 psi
200 psi
23
Alt-Q to Stop Acquisition, Then Save
24
Press F6 to Analyze Valve Checks
Examine Display and Verify Correct SV and TV
Check Loads are Selected
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If PRT Used for Valve Checks

• 1. Verify Correct SV Check Load is Selected
• 2. Click Apply button to Adjust SV to Buoyant Rod
  Wgt.

26
If PRT Used for Valve Checks

• 1. After Clicking Apply button to Adjust SV to
  Buoyant Rod Wgt.
• 2. The Selected SV Check Load is adjusted to
  exactly match the Calc. Buoyant Rod Wgt.

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If TV Leaks
Possible problems worn plunger or barrel,
pitted ball, cut seat, tubing leak, or well
flowing off.

• 1. Leakage rate indicated by changes in the
  polished rod load due to changes in the
  difference in pressure across the plunger
• 2. Liquid leaking past traveling valve and/or
  plunger enters pump barrel and increasing
  pressure.
• 3. Differential pressure decreases across
  plunger.
• 4. Pump load on the rods decreases, resulting
  in a decreasing polished rod load.

2500 psi
500 psi
200 psi
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If TV Leaks
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If SV Leak
Possible problems pitted ball, cut seat, hole in
pump barrel, or damaged pump parts.

• 1. Liquid leaking past standing valve leaves
  pump barrel and decreasing pressure.
• 2. The leak causes increasing differential
  pressure across plunger, and results in the
  plunger applying fluid load to rods.
• 3. Both pump rod load and polished rod load
  increases.

2500 psi
2000 psi
200 psi
30
If SV Leaks
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Problem TV Load OK, but NO SV Load

• Possible Problems
• 1. Severe SV leak.
• 2. Gas Locked Pump, P3gtP2gtP1.
• 3. SV is stuck open
• 4. Fluid level below pump intake.
• 5. Specialty Pump Gas Compression Chamber

2500 psi
200 psi
200 psi
32
TV Load OK, but NO SV Load
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Problem SV Load OK, but NO TV Load

• Possible Problems
• 1. Completely worn out plunger/barrel or TV
• 2. TV is stuck open
• 3. Deep Rod Part or Pump Parted.
• 4. Well flowing through pump and both valves
  open.

2500 psi
2500 psi
200 psi
34
SV Load OK, but NO TV Load
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The END