RELIEF WELL INJECTION SPOOL (RWIS)

RWIS Frequently Asked Questions

Why is it important to achieve single relief well contingency?
Having a single relief well minimizes the risks, resources and costs associated with a relief well intercept, as well as reducing the complexity of the operation. In addition, in certain geographic regions, a single relief well contingency is a regulator requirement.
When designing a well, what happens if the kill requirement exceeds the capacity of one relief well?

The new regulations in place in certain regions of the world have introduced limitations to what operators can do in their planning phase. If calculations show that the kill requirement exceeds the capacity of one relief well, the operator would usually have to redesign the well.

This could introduce added costs to the project, and also, in some cases, add or increase the complexity of the well design.
How is the RWIS able to achieve these high injection rates?
Hooking flexibles up to the RWIS below the BOP removes the mechanical bottle neck caused by kill and choke lines of a conventional BOP riser system. By removing this restriction you can achieve much higher injection rates.
How can you shorten a response when drilling a relief well?
The RWIS allows access to higher injection rates and pumping capacity, meaning a shallower intercept can be achieved, regardless whether the well is a high rate discharge well or not. This shallower intercept reduces the time required to kill a well significantly.
How can I maximize production without exceeding the capacity of a single relief well?

The RWIS has a dual benefit. It ultimately has the safety benefit of being able to achieve single relief well contingency, without having to redesign your well, but it can also unlock the potential for planning bigger bore wells and therefore enable more efficient field development.

 It can unlock economic benefits for you by allowing you to maximize flow rates through increasing the size of the wellbore, while still maintaining a single relief well. As production targets can now be met with fewer wells by having access to the RWIS, the CAPEX cost savings achieved can be incredible.

What is so unique about the design of the RWIS?

The RWIS and our method for killing a blowing well was recently patented.

When compared to other well control hardware, the ability to hook up large diameter flexibles in a subsea environment via an ROV (in a system that is configured to be as erosion resistant as possible, is lightweight, and has the necessary safety barriers in place), without negatively impacting the existing BOP well barriers or operation, is what makes the RWIS so unique.

In addition to this, the RWIS has passed multiple technical integrity screenings from various oil and gas operators.
How can operators gain access rights to the RWIS?

Before an operator is granted access rights to the RWIS, a feasibility study must be conducted to assure the well can in fact be killed via a single relief well using the RWIS. At this stage, Add Energy’s team of reservoir and flow experts, in collaboration with their blowout contingency team conduct this study on behalf of the client in order to identify if the RWIS is a suitable contingency measure.

If the RWIS is selected as a viable means of well control, then the operator enters into a contract for RWIS access via our colleagues at Trendsetter Engineering. They, in turn, issue a RWIS access certificate as proof of RWIS access to show regulators.
Why are blowout and well kill simulations and studies so important?

In general, blowout and kill simulations contribute to risk awareness. Before you’re allowed to drill, you need to apply for consent and provide the regulator with documentation for the upcoming operation. This application should include a contingency plan for regaining control of the well if the worst was to happen.

Many countries now have regulations that require companies to demonstrate single relief well contingency, and some of the major operators have similar internal guidelines and policies that dictate this.

Relatively speaking, it can be straightforward to control a blowout. But often, it can be very challenging. We look at the reservoir properties, reservoir fluid, drilling program, well completion, wellbore survey, etc. and develop possible scenarios of why things might not go according to plan. And once established, we calculate the potential blowout rate, simulate it and calculate what is required in terms of gaining control of that blowout scenario. We then pass our findings to the client, along with our recommendations for contingency planning and whether a single relief well is viable or not.
Can operators use the RWIS to gain approval for the development of bigger well bores to maximize production?
It’s at the pre-feed study stage that we would recommend introducing the RWIS as a tactic to help get big bore developments sanctioned. Because of the ability to quadruple kill mud injection rates, the RWIS provides the perfect contingency measure that can be used to kill prolific big bore wells successfully.
How long does it take for the RWIS to get it its location from time and date of request?
This is dependent on the location of the incident and availability of transport, but typically, the RWIS is delivered to the airport or dock within 24 hours of requested call out.
Do I need to redesign my well to fit the RWIS?

No, it has the safety benefit of being able to achieve single relief well contingency, without having to redesign your well. All interfaces are industry standard and the system comes with all the necessary hardware to connect a flexible and BOP to the system.

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