CATEGORIZED | News

Candidate selection could be key to successful underbalanced drilling project

Posted on 27 March 2012

By Katie Mazerov, contributing editor

A successful UBD operation begins with the right candidate selection and good communication among the stakeholders.

A successful UBD operation begins with the right candidate selection and good communication among the stakeholders.

Upfront planning and appropriate candidate selection are critical to achieving success in underbalanced drilling operations, especially as the industry begins to look to deepwater as the next frontier for the application, Patrick Brand, executive VP for Blade Energy Partners, said in a presentation at the 2012 SPE/IADC Managed Pressure Drilling & Underbalanced Operations Conference & Exhibition, 20-21 March in Milan, Italy. “Underbalanced drilling (UBD) has been around for more than 100 years in one form or another, but there are still issues that we as an industry see every time we get into underbalanced projects,” Mr Brand said.

The key for success in UBD lies in the preliminary work, starting with candidate selection, or the process of choosing the right reservoir for the application of underbalanced drilling, he said. “UBD cannot create value where it does not exist. … If you don’t get the candidate right, you are bound to have a failed project. Companies that try and short-cut this phase of the work ultimately run into accidents, nonproductive time (NPT) and failures.

“Doing the work up front and getting it right leads to proper equipment, procedures and training, which is what makes the project successful,” he continued. At the center of that process is good communication among all stakeholders involved in the project.

Mr Brand maintains there are still several concepts about UBD that the industry has not fully grasped. For one, UBD is a reservoir exploitation tool first and foremost, not a drilling technique, he said. “We’re trying to enhance the reservoir by increasing productivity and ultimate recovery or determine the reservoir’s characteristics.” He identified reservoir characterization as a process where many companies are missing out on an opportunity to use clean data to determine the true permeability of the reservoir, which can aid in the final completion design. “For example, knowing where the fractures are can really help us get the most out of the reservoir.”

Do your homework

Another issue concerns the over-estimation of equipment required for multi-phase hole cleaning. “We all work under the same general rules, but we’re learning that often these rules are very conservative and that we can easily drill wells at lower parameters,” Mr Brand said. “We have actually killed projects for problems that don’t exist.”

There is also confusion in the industry as to when to use UBD versus managed pressure drilling (MPD). “MPD has really taken over in a lot of areas, but knowing when to use the right technique is very important,” he said. It’s also critical to understand the chemical interaction between produced and pumped fluids and equipment. “In cases where oxygen or produced fluids are pumped with gas, if you don’t do your homework correctly, you can have problems with elastomers or chemical reactions.”

In deepwater, Mr Brand believes the biggest challenge for deployment of UBD involves the loads on the riser. “If we’re looking at taking the returns of multi-phase fluid up in that riser, we need to make sure we can control the well safely, especially when we encounter the possibility of leaks or anything else in the rotating control device, and the unloading of that riser,” he said.

In addition to deepwater applications, challenges for UBD include tripping and running completions efficiently, wellbore stability, barrier policies, equipment certification and specifications, and low-rate metering/multi-phase metering. “It’s easy to drill underbalanced,” Mr Brand said. “The challenges come in getting out of the hole and getting the completion in the hole. We need to do a lot of work in that area and get better tools for doing it effectively.”

Leave a Reply

*

FEATURED MICROSITES


Recent Drilling News

  • 21 October 2014

    IADC Cybersecurity Task Group to provide industry guidance to assess risks

    The oil and gas industry is not immune to cybersecurity threats, from computer viruses and malware to targeted attacks. The IADC Advanced Rig Technology (ART) Committee…

  • 21 October 2014

    Check-6 launches RIGOR digital checklist and compliance system

    Check-6 has launched RIGOR, a checklist-based mobile app to help simplify complex procedures and mitigate human error on the rig. Taking lessons from the aviation industry…

  • 21 October 2014

    Video: Next IADC Land Contract update to start in 2016

    The latest version of the IADC Land Contract was released in November 2013. Various incidents, including Macondo, delayed the release. “It’s an industry contract…

  • 21 October 2014

    Moomjian: ‘Honesty is the best policy in doing business’

    With more than 35 years in industry, Cary Moomjian, President of CAM OilServ Advisors, has seen the industry come a long way in terms of compliance and business ethics...

  • 21 October 2014

    Video: Companies prepare for EU Offshore Safety Directive compliance

    Earlier this year, Sir Ian Wood released a report on maximizing recovery from the UK Continental Shelf and recommended a new independent regulator to focus more on licensing…

  • Read more news