In the previous article, we looked at 6 Key Well Abandonment and Decommissioning Challenges and I promised to share with you some of the latest decommissioning technologies and strategies which are in use or being developed and tested today in the Oil & Gas sector.
But first, I think it is important to explain the importance of the need for innovation to tackle the enormous challenges we face with decommissioning in the coming years. Let's do that by looking at a case study of the UK Continental Shelf (UKCS)..
Case Study - UKCS Decommissioning Challenge
The UKCS Decommissioning 2017 Cost Estimate Report provided a cost estimate for offshore oil and gas decommissioning in the UK Continental Shelf (UKCS) of £59.7 billion in 2016 prices. The Oil & Gas Authority (OGA) has set an ambitious target to reduce these costs by at least 35%.
“The two biggest things that will get the North Sea through the next five years are genuine collaboration and the development and application of technology ... that strategy can halve the cost of well plugging and abandonment” Sir Ian Wood
In a recent interview with Energy Voice, Sir Ian Wood summarised the way forward for decommissioning very well, highlighting a need for improvements in technology and also improved collaborations to reduce costs. In this article I will discuss both the latest decommissioning technologies and decommissioning strategies..
LATEST DECOMMISSIONING TECHNOLOGIES
1. Melting the Cap Rock
Melting the cap rock is a method of decommissioning which uses a thermite plug to seal off the well by melting both the well components and the rock formation around them to recreate the cap rock, i.e. Caprock barrier
The low-cost method of rigless well P&A was trialed onshore by Centrica in Canada in 2016, the trial results demonstrated that this technology could potentially reduce well P&A costs by more than 50%.
2. Resin Plugs
Resin has the ability to formulate completely free of solids, allowing it to penetrate microchannels and effectively seal leaks which may not be possible to seal with cement due to it’s particle size.
Resin Application in P&A includes squeezing for annular fluid flow; shut-off gas source and squeezing a previously leaking plug.
Oceaneering recently conducted the Gulf of Mexico’s first permitted lower abandonment using resin. Because there was a downhole obstruction, the operator of this particular field determined that it could not reliably carry out a lower temporary abandonment with cement.
3. Underwater Drones to Monitor Abandoned (P&A) Wells for Potential Hydrocarbon Leaks
Praxis Energy Partners have proposed an innovative cost-saving solution for postoperative surveillance to ensure a leak-free subsea well abandonment over time.
The project proposes to build an underwater drone, using passive acoustics (to "listen" for leaks), and/or sonar (to "ping" for leaks), and/or a camera (take pictures of “bubbles”).
4. Well Barrier Monitoring System
The Stuart Wright Right Time Barrier Condition (RTBC) proprietary wellbore monitoring software can be used in both the well P&A planning and execution phases to accurately capture the condition of the well prior to and during the well abandonment.
During the planning phase, RTBC can be used to create accurate as built wellbore diagrams with critical barrier integrity validation information captured through the generation of Daily Integrity Reports (DIR) performed retrospectively. The DIRs will incorporate key information from the drilling, completions, production and intervention phases to accurately capture the condition of the well and any potential barrier risks that require consideration prior to commencing the well P&A.
During the well execution phase, RTBC will create accurate as built wellbore diagrams with critical barrier integrity validation information captured through the generation of Daily Integrity Reports during the actual wells abandonment. The Daily Integrity Reports will be captured in a secured cloud database that tracks the progression of the abandonment from the perspective of ensuring the abandonment of well barriers are conducted in accordance to corporate or good abandonment practices.
(Disclaimer: I am a consultant employed by Stuart Wright)
5. Suspended Well Abandonment Tool (SWAT)
Claxton have developed a Suspended Well Abandonment Tool (SWAT) which is deployed through the moonpool, landed on the wellhead and then used to conduct casing perforation and placement of the required cement barriers in the well. It can be deployed from a vessel, removing the need for a drilling rig.
6. Gator Perforator
Lee Energy Systems have created this "REPEATABLE HYDRO MECHANICAL MULTI-USE PERFORATING SYSTEM" which can be used to perforate casing without the need for explosives. The video above demonstrates really well how the tool operates, please watch it at your convenience to find out more about this technology.7. Latest P&A Technology
Archer and Hydrawell both offer systems which can offer significant time savings, compared to a typical well P&A, by eliminating the need to perform a milling section and performing the perforation and cementing in a single trip.
"HydraWell’s technology enables plugging of each well in 2-3 days instead of 10-14 days with conventional section milling methods. This means that the operator could save up to 200 rig days on a 20-well field,” says Mark Sørheim, CEO of HydraWell.
Archer Stronghold™ Systems
Archer's Stronghold™ Barricade™ is designed to perforate selected casing or liner sections; wash and clean the perforated zone completely; then enable permanent rock-to-rock cement plugging—all during a single trip.
The HydraHemera™ system was developed to enable plugging a well across multiple annuli without performing a section milling operation.
The system consists of two components, a HydraHemera™ Jetting Tool and a HydraHemera™ Cementing Tool. The HydraHemera™ Jetting Tool is used to wash and clean out debris in the annuli behind perforated casings. It features jet nozzles which are positioned at irregular angles and engineered for optimum configuration and exit velocity. The jets penetrate and clean thoroughly behind multiple perforated casings.
The HydraHemera™ Jetting Tool ensures optimum conditions in the casing annuli prior to placing the plugging material in the cross section. Debris, old mud, barite and old cuttings are replaced by clean mud.
Using a ball drop mechanism after jetting, the HydraHemera™ Cementing Tool is activated, and combined with the HydraArchimedes™ tool enable placing plugging material in the entire cross section of multiple annuli, and hence, establishing a proper barrier in the well for P&A or sidetrack purposes.
You can view a video of the HydraHemera™ system here.
LATEST DECOMMISSIONING STRATEGIES
Historically, the oil and gas industry has not been particularly strong in collaborating and cross-sharing information. In today's low oil price environment, especially in the area of decommissioning where cost saving is paramount, there is now an increased impetus towards collaboration. Below are some examples of collaborations focused around decommissioning and well abandonment.
1. OGA Well Plug and Abandonment (P&A) Optimisation Programme
In February 2017, the Oil and Gas Authority (OGA) launched a search for operators to voluntarily participate in a multi-operator, well P&A optimisation programme.
The objective of the pilot programme is to demonstrate the cost savings which can be achieved through collaborative working, stimulate work-sharing campaigns and adopt improved execution and contracting models.
It will be interesting to see how successful this initiative is and how many Operators opt to sign up for the programme.
2. Integrated Consortiums
In answer to Operator's desire to have a single point solution for decommissioning, a number of consortiums have formed to provide such an offering. One such example is the Bureau Veritas - Stuart Wright consortium which was recently formed to support clients in the North Sea, Asia-Pacific and beyond.
Tackling the enormous challenge of decommissioning will require not only advances in technology but also smarter strategies on how to collaborate to improve efficiency, knowledge sharing and reduce costs.
I have highlighted a few examples of the latest decommissioning technologies and strategies in this article as a starting point for discussion, it would be great to use this platform to hear from you on other technologies and strategies which you have knowledge of or experience with - PLEASE COMMENT BELOW..
Something interesting to share?
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The U.S. Energy Information Administration’s (EIA) latest Petroleum Supply Monthly shows the significant changes in petroleum markets that occurred in April, when most of the United States was under stay-at-home orders to limit the spread of coronavirus. In April, commercial crude oil inventories increased by 46.7 million barrels (10%)—the largest monthly increase in EIA data going back to 1920. U.S. refineries operated at 70% of their capacity, the lowest utilization rate in EIA’s monthly data series dating back to 1985. Demand for finished petroleum products fell to 11.7 million barrels per day (b/d), the lowest level since at least 1981.
April’s crude oil inventory increase is a result of refinery runs falling more quickly than crude oil supply, which is determined by domestic production and imports. U.S. crude oil production in April averaged 12.1 million b/d, a decrease of 669,000 b/d (5%) from March. This decrease represents the largest month-over-month decline since September 2008, when Hurricanes Ike and Gustav hit the U.S. Gulf Coast. U.S. crude oil imports fell by 776,000 b/d (12%) from March to April, further decreasing crude oil supply in the United States.
The combined drop in production and imports was smaller than the decline in gross inputs to refineries, resulting in record increases in crude oil inventories. Based on estimates in EIA’s Weekly Petroleum Status Report, commercial crude oil inventories reached a record high of 541 million barrels in the week ending June 19 and have fallen slightly in the weeks since then.
Source: U.S. Energy Information Administration, Petroleum Supply Monthly
Changes in travel patterns resulted in the lowest levels of U.S. demand for finished petroleum products (as measured by product supplied) in decades. Transportation fuels have been affected differently by changes in travel: demand for jet fuel and motor gasoline fell much more than distillate fuel, which is primarily consumed as diesel. From March to April, product supplied of finished motor gasoline decreased a record 1.9 million b/d (25%) to 5.9 million b/d, the lowest monthly value since the mid-1970s.
In the span of two months, U.S. demand for jet fuel fell by more than half, from 1.6 million b/d in February to 691,000 b/d in April. Before April, U.S. jet fuel demand had not been less than 700,000 b/d since the mid-1970s.
Distillate demand fell by 408,000 b/d, or about 10%, from March to April. Although the change in distillate demand was less drastic than the changes in motor gasoline and jet fuel demand, distillate consumption in April 2020 was the lowest in more than a decade.
Exports of natural gas to Mexico by pipeline are the largest component of U.S. natural gas trade, accounting for 40% of all U.S. gross natural gas exports in 2019. EIA expects these exports to increase with the completion of the southern-most segment of the Wahalajara system, the Villa de Reyes-Aguascalientes-Guadalajara (VAG) pipeline. VAG began operations in June 2020, connecting new demand markets in Mexico to U.S. natural gas pipeline exports.
The Wahalajara system is a group of new pipelines that connects the Waha hub in western Texas, a major supply hub for Permian Basin natural gas producers, to Guadalajara and other population centers in west-central Mexico. The Wahalajara system provides U.S. natural gas to meet growing demand from Mexico’s electric power and industrial sectors. With the 0.89 billion cubic feet per day (Bcf/d) VAG pipeline entering service, EIA expects utilization of the Wahalajara system to quickly ramp up, resulting in increased U.S. natural gas exports to Mexico out of western Texas and additional takeaway capacity out of the Permian Basin.
Since 2016, Mexico has been expanding its natural gas pipeline system, which has supported continual growth in U.S. natural gas exports. Most of this growth has been in U.S. natural gas exports from southern Texas after the existing U.S. pipeline infrastructure was expanded and the Los Ramones Phase II pipeline in central Mexico was completed.
Since the Sur de Texas-Tuxpan pipeline was completed in September 2019, U.S. natural gas exports to Mexico reached a record 5.5 Bcf/d in October 2019. U.S. natural gas exports from the border at Brownsville, Texas, to the southeastern state of Veracruz in Mexico averaged 0.6 Bcf/d during the last quarter of 2019, or about 20% of the pipeline’s capacity.
Overall, U.S. natural gas exports from this region have only increased by 0.2 Bcf/d from 2016 to 2019 because of delays in pipeline construction in Mexico. In particular, two regional pipelines were completed in 2017 but have not been used near their capacity:
Source: U.S. Energy Information Administration, Natural Gas Monthly
The Comanche Trail pipeline has been delivering an average of 0.1 Bcf/d of natural gas to Mexico since the San Isidro-Samalayuca pipeline entered service in June 2017. Pipeline operators do not expect flows to rise until the 0.47 Bcf/d Samalayuca-Sásabe pipeline is completed in either late 2020 or early 2021 in Mexico.
The Trans-Pecos pipeline, the U.S. segment of the Wahalajara system, did not transport significant volumes of natural gas until October 2018; it is currently only operating at 10% to 15% of its total capacity. Most of the demand centers are in southern Mexico, waiting to be connected to the VAG pipeline. Three of the project’s four pipelines in Mexico that are currently in-service include
Before the economic impacts and uncertainty associated with COVID-19 mitigation efforts and declining crude oil prices, S&P Global Platts expected U.S. natural gas exports to Mexico to increase immediately by 0.3 Bcf/d to 0.4 Bcf/d on the Wahalajara system. However, given the decreased demand for natural gas in Mexico in response to the economic impact of COVID-19 mitigation efforts, growth is likely to be slower than expected. Beyond these volumes, additional export volumes will be limited by how quickly customers in Mexico can be connected to the pipeline system.
These connections include new natural gas-fired combined-cycle generators and the scheduled 2020 completion of the 0.89 Bcf/d Tula-Villa de Reyes pipeline, which will deliver natural gas to central Mexico. Deliveries from the Wahalajara network are likely to partially displace higher-cost liquefied natural gas (LNG) imports into Mexico’s Manzanillo terminal, which serves markets in Guadalajara and Mexico City.
As U.S. natural gas exports on the Wahalajara system rise and crude oil prices remain low, EIA expects the price at the Waha hub in the Permian Basin, which had been steeply discounted to the Henry Hub national benchmark, to continue to strengthen.
Officially, we are past the half point of 2020 and with that the end of the second quarter. And what a quarter it has been. WTI prices plunged into negative territory (as low as -US$37/b) then recovered to US$40/b as OPEC+ moved from infighting to coordinating the largest crude production cut in history. In between, the Covid-19 pandemic wreaked havoc with the global economy, setting off a chain reaction within the oil world whose full impact is still unknown.
Opinions on a post-Covid oil world are divided. Some voices, the more optimistic ones, think that oil demand could recover to pre-Covid levels within a year or two. The more pessimistic ones think that this will never happen, that Covid-19 has hastened the trend away from fossil fuels to sustainable energy against the backdrop of climate change. Either way, this has thrown a spanner in the works of the giant, multi-billion oil and gas projects that were announced over the past two years as the energy world began to wake up from its post-2015 price crash investment hibernation. Those projects were made at a time when oil prices were at US$50-60/b. Since oil prices are now only at US$40/b, the current value and the future worth of these assets have now declined. Energy companies account for this by adjusting the value of their portfolios in accordance to the projected value of crude: an upward adjustment is known as a revaluation, and a negative one is known as an impairment.
This is a term that will crop up many times over 2020, as energy companies close their quarterly financial books and report their results to shareholders. The plunge in crude oil prices and the uncertain outlook for oil demand means that publicly-traded companies must account for this to their shareholders. Chevron was the first supermajor to book an impairment, in late 2019 when it took a US$10 billion hit to its oil and gas assets. It wasn’t the only one: firms all across the oil chain also reduced the value of their assets, from Repsol to Equinor.
Further impairments were made in April 2020 when the Q1 financial results were announced, mainly in response to the triggering of the OPEC+ price war (which saw crude prices halve from US$60/b to US$30/b) and the Covid-19 pandemic accelerating to a point where over half of the world’s population went into lockdown. But the major impact will come in Q2 2020, when the roil in the oil markets truly began to boil uncontrollably. BP has announced that it may take up to a US$17.5 billion impairment in its Q2 2020 financial results, while Shell has just admitted that it may have to shave US$22 billion from its asset value.
This has roots not just in the depressed demand for energy due to Covid-19, but also the ongoing conversation on climate change. Almost all supermajors have announced intentions to become carbon neutral by the 2050 timeframe. That may be good news for the planet, but it is bad news for the companies’ portfolio. Put simply, it means that some of the assets that they have invested billions in are now not only worth a lot less (due to Covid-19) but they may in fact be worth nothing at all, because climate change considerations mean that they will never be exploited. Challenging projects such as Total’s deepwater Brulpadda discovery in turbulent South African waters or Pertamina/ExxonMobil/Total/PTTEP’s beleaguered and complicated East Natuna sour gas asset in Indonesia may never be commercialised, either because of uneconomic prices or because they run counter to the goal of becoming carbon neutral. The Financial Times estimates that the amount of unviable or stranded hydrocarbon assets could reach as much as US$900 billion; that figure is pre-Covid, and could now become even higher.
There is one supermajor bucking the trend though. The biggest supermajor of all, in fact. Unlike its peers, ExxonMobil has not yet succumbed to impairments. If fact, it has not announced any negative revaluations at all over the past decade, even during the 2015 oil price crash. ExxonMobil claims that this is because it books the value of new assets ‘very conservatively’ and does not ‘adjust values to short-term price trends’, but critics say that it has an ongoing history of vastly overestimating its assets’ value. Along with Chevron, ExxonMobil does not disclose price assumptions in its financials. But unlike Chevron, ExxonMobil has not yielded to climate change through an official emissions target or asset revaluations.
On paper, that will make ExxonMobil look better than its supermajor brothers. But behind the scenes, this reluctance to admit that the future is less rosy than expected could be trouble waiting to be unleashed. Impairments are a necessary reality check: an admission by a company that things have changed and it is starting to adapt. Most have accepted that reality. ExxonMobil seems to be resisting. But even it is not immune. In pre-Q2 2020 results guidance that was just announced, ExxonMobil admitted that it expects to take a hit of some US$3.1 billion and slump to a second straight quarterly loss. In terms of Covid-19 impairments, that’s small. But it is, at least, a start.
End of Article
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