Plunger Lift Monitoring

The dashboard monitors plunger lifted wells performance, detects a number of operational challenges that wells might be experiencing, and suggests when plungers need to be replaced.

The Plunger Lift Dashboard consists of five (5) tabs.  

  1. Summary
  2. Production
  3. Problem Detection
  4. Plunger Replacement
  5. Parameters

Summary Tab

The summary tab gives an overview of the wells production performance with time as well as versus the set target production or forecast, the wells operational challenges or problems in the form of a problem score, and how close plungers are to a maximum historical mileage in the form of a plunger replacement score.

Filter

The dashboard has a slicer and filter on the left side of the screen. The filter allows the user to select specific dates as well as specific fields and individual wells.

Current Problem Score

Ranks the wells based on the existence of operational challenges in the form of a problem score. The problem score depends on the detection of a drop in the plunger rise velocity, an increase in the difference between the casing and well head pressures at the end of the production period of plunger cycles, and a drop in the volume of gas produced per plunger cycle; all compared to expected values or thresholds.

The problem score is the weighted sum of the underlying input scores:

Problem Score = W1 * Plunger Velocity Drop Score + W2 * Differential Pressure Increase Score + W3 * Produced Gas Drop Score

Where W1, W2, and W3 are customizable weights, whose default values are 0.35, 0.25, and 0.40 respectively. The problem score is not calculated for periods of flowline pressure increase 

The current problem score is the average problem score for the current day (the day at which the score calculation is taking place).

Wells sized by Plunger Replacement Score

Plunger replacement score is a score reflects how close a plunger is to a maximum historical mileage at which a plunger run in the same well was replaced. On the map, the larger the circle, the larger the score.

Gas Production Variance

The graph shows the produced gas volumes, the target or forecasted gas volumes as well as the variance between those two over time.

Production Volumes

The graph plots the produced gas and liquid volumes over time.

Production

The Production tab focuses on the production in more detail.

Filter

Same as documented on the Summary tab.

Gas Production Variance

The graph shows the produced gas volumes, the target or forecasted gas volumes as well as the variance between those two over time.

Last Day / Week / Month Gas Variance

Variances and volumes for the last day, last week, and last month.  

  • Last day is the last full day, not the previous 24 hours.
  • Last week is the last full week, not the previous 7 days.
  • Last month is the last full month, not the previous 30 days.

Cumulative Production

A bar graph that displays the produced gas volume per entity according to the date slicer.

Liquid Production and Liquid Gas Ration

Problem Detection

The tab focuses on the components of the problem score. The line plots show the problem score, the plunger velocity, the differential pressure at the end of plunger cycles, and the produced gas per cycle; all at 15-minute intervals for the last two months, and the bars indicate the detected changes in those problem score components compared to customized thresholds.

Filter

Same as documented on the Summary tab.

Current Problem Score

Below the filter, a card shows the current problem score for the selected well, and a table lists the problem score of all the wells ranked from highest to lowest. The current problem score is the average problem score for the current day.

Problem Score

The problem score is a combination of Plunger Velocity, Differential Pressure and Produced Gas Drop with different weights.

Plunger Velocity Drop

The graph displays the raw data over time as well as the flags (gray bars) for an alarm.  The alarm for velocity is if it drops below 0.7 from the last 2-month average.

Differential Pressure Increase

The graph displays the raw data over time as well as the flags (gray bars) for an alarm. The alarm for differential pressure increase is if there are 2 or more alarms in the last 24 hours and both the differential pressure and the moving average is greater than 0.

Produced Gas Drop

The graph displays the produced gas rate aggregated using minute data as well as the flags (gray bars) for an alarm.  The alarm for gas is if the moving average is less than 0.85 of the last week of data.

Plunger Replacement

The tab focuses on the plunger replacement score. The line plots show the replacement score and the plunger mileage on a daily basis for the last year, and the bars indicate the replacement score has reached a customized threshold. The mileage resets to zero (0) when the plunger is replaced.

Filter

Same as documented on the Summary tab.

Current Plunger Replacement Score

Below the filter, a card shows the current plunger replacement score for the selected well, and a table lists the plunger replacement score of all the wells ranked from highest to lowest.

Plunger Replacement Score

The Plunger Replacement Score is based on 0.7 of the Plunger Mileage and 0.3 of the Gas Production Rate.

Plunger Mileage

The alarms start at 90% of the expected plunger milage.

Parameters

This tab shows the operational parameters of the plunger lifted well for the last month on a 1-minute basis. Those are the gas production rate, the casing head pressure, the well head pressure, and the flowline pressure. In addition, the daily produced gas and liquid volumes are plotted in the same tab.

Filter

Same as documented on the Summary tab.

Produced Gas Rate

Produced Volumes

Static Pressure

Casing Pressure

Tubing Pressure