Production Logging

Madden Systems offers production logging and analysis services by experienced production loggers, techicians, and analyst. In addition, we have the equipment to acquire data in environments that others can not. We specialize in slimhole tools with high temperature ratings.

Production Logging Tools

		Standard PLT - Our basic PLT. It consists of a continuous flow meter (spinner), temperature, capacitance, quartz pressure, collar locator, and gammaray sensors. The O. D. of the tool is 1.375".
		High Temperature PLT - This package is flasked and contains the same sensors as our Standard PLT. It has a temperature rating of 450 degrees but can be run to higher temperatures for limited time. It is one of the industry's smallest flasked tools at only 1.625" O. D.
		Geothermal PLT - This package consists of spinner, temperature, pressure, collar locator, and optional gammaray sensors. It is rated for 650 degrees F and has an O. D. of only 1.78".

Service Model & Philosiphy

A Production Log should not be considered as "a log". Production Logging includes a wide array of sensors, logging methods, and conditions in which they are used. Many times those authorized to use a "Production Log" will simply release the work to the field with no little concern as to the type of equipment used or how the equipment is used. Later, they are concerned when the results are inconclusive. One should think of Production Logs as the culmination of an investigation into the fluid movement in a well. It takes communication, planning, and proper execution to accomplish test objectives.

Speaking of test objectives, how can you answer a question when you don't know what the question is? It sounds funny, but I'm afraid this is a painful truth in our industry.

How We Do Production Logging

We strive to become part of your team to help solve the issues you face. Notice I said, "help solve". We can not do it by ourselves. You must supply information that will enable us to use our knowledge and expertise in Production Logging to determine how we can help, or even, if we can help.

Test Objectives

Why do you want to run the log? It's a simple concept. But, it's one of the most crucial pieces of information needed to run a successful test.

Well Parameters

(Well Bore Diagram) Well Name, Surface Connection, Pipe Sizes, Pipe Weights, Well Bore Jewelry, Minimum ID, Maximum Deviation, TD, PBTD, and a complete list of perforations.

Well Performance

Production Rates, Flowing Surface Pressures, Choke Setting, Shut-in Surface Pressure, and Recent History.

Location

County, Field, State

Safety

H₂S, CO₂

, Location Hazzards

- Pre-Job Data Sheet that you can fill out and send as an attachment.File size: 53.5 kb.

Write Procedure

A selection of sensors and logging passes are chosen to design a job that will maximize our chances to accomplish the test objectives. Click here  for a PDF of an example procedure. File size: 130 kb.

Forecast Possible Results

Review the tool limitations and well conditions with the customer. Estimate the likely outcome of the logs so that the customer can make an informed decision to continue, or stop, the test. If the customer decides to pursue the test, a time and date must be agreed on. Contact all personnel, compile a contact list of phone numbers, and give each a copy of the procedure. The customer also needs to arrange for a correlation log to be on location with his, or her, representative(s).

Execute Job

Conduct safety meeting, rig up, and follow the procedure as a general guide. Please convey to your field representatives that our loggers must have the authority to change the procedure at any time during the test. Observed data or events on location may require our loggers to modify the procedure to optimize the results. That is the benefit of having an experienced production logger on location.

Send Data

Process Slicklogger data and transfer via the internet to Burl Wylie or Raymond Madden for processing.

Compile Preliminary Log

Compile the preliminary log and make a qualitative analysis of the data.

Email Results

Create a PDF of the log and comments. Compress the file and email it to the customer. If the customer is in the Houston area, or is willing to wait a day for a Fed Ex delivery, we will print one copy of the log and review the results in person or over the phone.

Test Objectives

Have the test objectives been met? More times than not, we have fulfilled the objectives at this point in the service. A high percentage of the wells we log have water problems and are below critical rate. They are characterized by sever water circulation and fallback. The customer wants to know where the water is entering the well bore and from what source so that they can determine if a remedial work over would be practical. A qualitative analysis will also suffice for leaks, communication out of zone, and other applications where the exact measurement of fluid rate is impractical or impossible.

If the well is above critical rate and the test objectives require a detailed, quantitative analysis, we move on to the next step.

Quantitative Analysis

A detailed, quantitative analysis is compiled to calculate the phase, volumes and percentages of production entries, or injection losses, in the well. It is primarily based on velocity and fluid density. They can be an excellent tool for diagnosing your well if conditions allow. We use Kappa's Emeraude software to generate our reports. .

Caveat Emptor

The sophistication of modern analysis software allows it to always give an answer. One does not have to be experienced in production logging anymore to generate these reports. You just have to know how to operate a computer. We have seen many reports that were run with data that should not have been used. While the color pages, multitude of calculations, and graphs are quite impressive. They only represent garbage in / garbage out. Unfortunately, once the process has gone this far, the reports take on some sort of perceived authentication, never to be questioned. Always, always, always ask questions.