Echometer How To TWM Basic Steps to Acquire

Echometer How To TWM Basic Steps to Acquire Polished Rod Transducer, PRT, Dynamometer Data. by Echometer Company Reference: Well Analyzer Quick. Refs, http: //www. echometer. com/support/quickrefs/index. html

POLISHED ROD TRANSDUCER INCLUDES ACCELEROMETER FOR POSITION FAST, CONVENIENT, REASONABLY ACCURATE LOAD AND POSITION DATA.

Echometer manufactures two sizes of PRTs. 1. The standard PRT will work on 1. 5 inch and smaller Polished Rods. 2. The large PRT is slightly wider than 2” and will work on 2. 0 and smaller Polished Rods.

PRT Dynamometer is Compact 1. PRT attaches to the polished rod. 2. For load the PRT outputs a voltage signal proportional to the change in diameter of the polished rod due to the rod loading. 3. Acceleration data is processed to determine polished rod position. 4. Do not install PRT without the well analyzer turned on and the TWM software program running.

Acquired Acceleration of Polished Rod Position of the polished rod is determined by twice integration of measured acceleration data. Accelerometer is compact, convenient to use, less expensive, and more accurate than conventional string position indicators.

Exercise care when handling PRT. 1. Do NOT drop the PRT on a hard surface. 2. Do NOT allow the stuffing box to hit the PRT at the bottom of the stroke. 3. If the metal web of the PRT is damaged due to some type of permanent deformation, then PRT cannot be repaired. Old style PRTs had a 20/1000 inch thick web and were more susceptible to damage, than the PRTs currently manufactured.

Connect the cables to Well Analyzer. Far end on the coiled cable is attached to the 25 -foot Y-cable, that is connected into the MAIN INPUT on the Well Analyzer.

Turn on Well Analyzer and wait for GREEN LED.

Turn on the computer.

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 analyzer’s internal electronics and sensor measurements may be acquired.

Select the Dynamometer Sensor tab. 1. Select the serial number of the PRT, Polished Rod Transducer. Use Create New… if your serial number is not found in the list. Make sure all coefficients are entered as typed on transducer label. 2. Place the PRT on a flat surface prior to placing on the Polished Rod and verify the transducer output.

Stop the Pumping Unit carefully, near the bottom of the stroke. For safety purposes when stopping the pumping unit to attach the PRT transducer, the operator should disconnect the power and set the break.

Center PRT with Half Moon Cut. 1. Center the PRT on the polished rod by using the half moon cut. Half Moon Cut 2. DO NOT push the PRT too far forward on the polished rod, OR load drift can occur. 3. The side of PRT with Patent Label points up. 4. Initially, only lightly tighten the PRT.

PRT placement reduces load drift. 1. PRT should be attached to the polished rod at least 6 inches from any load bearing clamp. 2. Always attach the PRT on the plain steel part of the polished rod. Do NOT attach PRT onto a rusty polished rod. If the steel surface is not bonded to the polished rod prior to attaching the PRT, then use emery cloth on the polished rod to clean and smooth the polished rod surface.

Connect the coiled cable to the PRT. 1. Attach coiled cable to PRT before tightening PRT on the Polished Rod. 2. DO NOT overtighten the PRT when initially placed on Polished Rod. 3. As little as 1/8 turn over-tightening can destroy the PRT transducer.

Proper tightness reduces load drift. Any change in temperature of the transducer or polished rod will be the primary cause of load drift. Try to maintain the PRT at the same environment temperature as the polished rod OR let the temperature stabilize after the PRT is placed on the polished rod.

TWM Software – F 3 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.

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

Save Changes to Base Well File 1. Click Save button to be sure to save changes to the base well file.

Select Type of Data Acquisition Test 1. Tap F 4 to Select Test type to be acquired. 2. Click the Dynamometer Tab to indicate that DYNO data will be acquired. 3. Select F 5 to Acquire Data

When attaching PRT view TWM display to adjust to proper tightness. 1. Tightening the PRT is a safety issue. 2. Echometer does not recommend that you tighten the PRT while the pumping unit is moving.

TWM Software Wizard Steps thru Process of Connecting the PRT Proper installation requires the operator to place the PRT between himself and the polished rod, grasping the adjusting screw with the right hand the electrical connector towards the left).

Follow step-by-step Instructions: 1. To avoid the possibility of damaging the PRT • Transducer output between 10 and 20 m. V/V, when not installed on the polished rod. • Clamping action will cause output to decrease. • Proper clamping force generates an output close to zero. 2. To insure that accurate data is obtained.

Step 3 Checks Accelerometer Signal 1. Normal output accelerometer output is near 0 volts. 2. Values outside the normal limits may indicate transducer has been installed upside down. 3. If installed upside down, TWM calculates the position so the bottom and top of the stroke are switched

Improve Visibility of Indicator by Selecting Other Display Options

Transducer Tightness Displayed 1. Initially the triangular indicator will be at the extreme right, as shown in the figure. 2. User is prompted to TIGHTEN the clamp so as to move the indicator towards the zero mark

DO NOT Over-tighten PRT 1. Excessive tightening can cause permanent damage to the transducer. 2. Notice that the transducer output now exceeds the – 3 mv/V limit on the left. 3. Tightening past the – 3 mv/V limit results in a warning being displayed.

Continue Adjusting PRT Tightness 1. Indicator at this point is near zero but not close enough. 2. Indicator has gone beyond zero, into the LOOSEN region 3. User should decrease the tightness

Proper Installation Results in a Nearly Centered Indicator When reading near ZERO is obtained, then click finish button. With a little practice the operator should be able to install the PRT and obtain the zero reading rapidly.

After Adjusting PRT Wrap Coiled Cable Around Handle 1. Loop the coiled cable around the adjusting screw to prevent the cable connector from pulling out of the transducer connector. 2. Dynamometer’s coiled cable can vibrate loose from the polished rod transducer connector as the polished rod travels up and down. 3. Side load caused by the coiled cable pulling on the polished rod transducer can affect the transducer's output.

Coiled dynamometer cable can become tangled in wellhead. 1. Support the cable to prevent entanglement with the wellhead connections during polished rod movement. 2. One end of coiled cable is connected to the polished rod transducer and the other end of the coiled cable is suspended on the ladder or fixed object. This setup is a safe way to protect the dynamometer cable, the cable connectors and the connector on the load cell.

Click Finish for TWM Automatic Display of Relative Rod Loading 1. Click Alt-D to Record 1. 0 Minute of DYNO Data. 2. Click Alt-S to START acquiring data for a specific length of time.

TWM Automatically Displays Rod Loading Depending on option Selected: 1. Click Alt-Q to STOP acquiring DYNO data. OR 2. After 1 minute TWM will STOP acquiring DYNO data.

Click Save Button to Store TWM Data in File 1. After 1 Minute or Alt-Q button is clicked, TWM prompts user to save recorded test data. 2. Two fields are available for the user to enter description for the session. 3. Click Save button to store acquired data.

Acquired Dynamometer Data: Load, Acceleration, Power, Current

DYNAMOMETER SURVEY ANALYSIS ANSWERS THE FOLLOWING QUESTIONS: 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Is the well pumped off? What is the pump intake pressure? What is the pump fillage? And pump displacement? What is the current pumping speed? Are the traveling and/or standing valves leaking? Are the maximum and minimum rod loads within limits? What is the polished rod and pump horsepower? Is the gearbox overloaded? Is the unit properly balanced? What movement of the counterweights will balance the unit? Is the downhole gas separator operating effectively?