Field Assessment of an Onshore Oilfield

Over the course of 80 years, more than 1.8 billion barrels of oil equivalent have been produced on a 45,000 acre field. With almost 1,000 wells total, about 75% of the wells have been shut in or plugged and abandoned, leaving just 25% of the wells active.

Now what?

Perhaps you could review and evaluate the reserves potential of this aging field using iStore’s Quick Value Assessment (QVA®) software and technical services. This is exactly what a National Oil Company (NOC) decided to do, and the results were eye-opening!

In just a few months, iStore’s team of engineers, geologists, geophysicists, petrophysicists, and data managers applied their QVA software and services, which resulted in some very important and insightful observations. At the end of the study, producers found that the main producing formation still had a large amount of remaining bypassed reserves, with over 350 of the shut in wells identified for recompletion opportunities. The use of horizontal producing and injection wells was identified to improve reservoir performance in many of the wells. The field also had shallower formations that were identified for testing to determine their productive capabilities. In addition, they found that water injection and hydraulic fracturing with proppants could recover oil from different sections of the reservoir to increase oil production. Since they also found that the productive limits of the field were much larger than originally estimated, the possibility of more exploration opportunities arose! 

The NOC decided to take action to increase production. They began by scheduling a review of over 350 wells with unperforated behind pipe net pay. They also established a recompletion opportunities program for the identified wells in order to increase oil production. Drilling new wells was also a necessity. New wells were scheduled to be drilled to test the potential of the shallower formation. Drilling step out wells was needed to extend the producing limits of the field. New studies and programs were created to conduct production tests and reservoir pressure tests to assist with determining the current reservoir pressure and the remaining reserves in the field.

iStore’s QVA software and services were able to quickly identify possible production potential in a field that might have been on its way to retirement. By implementing QVA, the NOC was able to identify numerous possibilities for improvement, giving the team an entirely new outlook on mature fields.

 

From Brownfields to Greenfields

Let’s say you have been pumping oil on the same field for 30 years. Recently, you have noticed production seems to be slowing down, leading you to assume that the field is almost tapped out. What should you do in this case? Most operators decide to walk away by plugging and abandoning their aging wells, leaving more and more mature fields left to dry every year.

But what if you decided to stick around and see what else your field has to offer? Where would you even start?

Rapid reserves analysis can be possible with the right technical approach, technology, and processes. By following iStore’s five easy steps, you can possibly turn that brownfield back into a greenfield.


1. Know where to start.

Take the time to prioritize your fields by focusing on the most important field factors: economic conditions, production decline, and field maturity. This step will help with your current field studies, as well as future field studies. It will save you both time and effort in the long run, as prioritizing your fields will help your team members identify which fields share reservoir characteristics and data sets.

2. Build a strong team.

You should rely on both your internal and external sources. Use your in-house engineers and geoscience experts to share their knowledge with outside consultants. Use contracting companies with on-demand knowledge on the matter to speed up the processes. Lastly, make sure you have a well-rounded team consisting of an engineer, geologist, geophysicist, and data management specialist.

3. Overcome data barriers.

Make sure you have access to all the technical data needed to evaluate your fields. Assembling the data can be difficult due to the fact that the data is typically stored in multiple databases across numerous entities. Luckily, with new technology processes, such as data aggregation and integration, you can easily speed up the data collection step.

4. Use a uniform process to identify the reserves and production opportunities.

Create a step-by-step approach, to be reused for future field studies. Begin by reviewing the geological framework, well logs and log analysis, PVT data, production history, and decline curve analysis. End by calculating volumetric original hydrocarbons in place to estimate recovery factors and remaining reserves.

5. Take action on the results.

A field study should provide a detailed action plan consisting of short-term and long-term opportunities. The short-term plan should identify profitable opportunities that can be implemented in 3 to 6 months, such as recompletions and workovers. The long-term plan should prioritize strategic activities consistent with your company’s business goals.


With iStore’s Quick Value Assessment (QVA®) field study solutions, your next field evaluation can be delivered faster and provide a clear, concise action plan for increasing production to extend the lives of your mature fields.