How Alberta’s Oil Sands are Produced
I spent the first week of November in the heart of the Athabasca oil sands around Fort McMurray, Alberta. I was there as a guest of the Canadian government, which hosts annual tours for small groups of journalists and energy analysts. In the previous two articles, I covered some of the environmental issues arising from the development of the oil sands.
In Oil Sands and the Environment – Part I I discussed greenhouse gas emissions, impacts on wildlife, and I touched upon water usage. I also detailed some of the work of Pembina Institute (PI), which is working to improve the environmental conditions as the oil sands are developed. In Oil Sands and the Environment – Part II I covered the tailings ponds, water consumption, impacts to water quality, and impacts to indigenous people.
Today I want to discuss the actual process of converting the oil sands into oil. Some may feel that this should have been the first article I wrote, but because the development of the oil sands is environmentally controversial on many fronts, I thought it was important to go over environmental issues first before discussing the process. I think that if I had covered the process first, most of the comments and questions would have been about the environmental issues.
First, I want to provide readers with a general overview of the situation in Alberta. I will discuss the two major methods of producing the oil sands — surface mining and in situ production — illustrated by the two companies that we visited on this trip: Canadian Natural Resources Limited (NYSE: CNQ, TSE: CNQ) and Cenovus Energy (NYSE: CVE, TSE: CVE). I will devote next week’s column to the energy return on energy invested (EROEI) and the cost of production of oil sands production based on information gathered on my trip, with a focus on data from Cenovus and Canadian Natural Resources.
Overview of Canada and Alberta
Canada produced 3.9 million barrels per day (bpd) in 2012, making it the fifth largest oil producer in the world. Canada is also the fifth largest global natural gas producer at 15 billion cubic feet (Bcf) per day.
Alberta has a population of 4 million people, and is Canada’s primary oil- and gas-producing province. Alberta’s economy is highly dependent on oil and gas. It is situated next to its more liberal neighbor British Columbia, which is a bit like having Texas border California.
Alberta accounted for 2.5 million bpd of Canada’s oil production, and 10 Bcf/day of Canada’s gas production last year. Alberta’s share of Canada’s oil production is expected to grow substantially over time. The province supplied 22 percent of US crude oil imports in 2012, a larger contribution than from any country outside of Canada.
Canada has the third-largest oil reserves in the world — more than Iran or Iraq. Of the 173 billion barrels of Canadian reserves, 169 billion barrels are from oil sands, which are a mixture of sand, clay, water, and bitumen – a very heavy oil.
Of the world’s oil reserves, 80 percent are state-owned or controlled. Only 20 percent of global reserves are accessible to independent oil and gas companies, and half of those are in Canada’s oil sands.
Alberta’s oil production has been growing by about 170,000 bpd each year, and a production increase of about 1.8 million bpd is forecast by 2022. There is some shale gas and tight oil in the central and southern part of the province, away from where oil sands are located. There have not been any forecasts made on future tight oil production in the province, as it is still at a pre-commercial stage.
Alberta’s goal is to be in the top quartile for conditions favorable for investing in the oil and gas industry, and to grow oil sands from its current market share of 2.1 percent of global oil consumption. Canada’s oil sands saw $25 billion (Canadian) of investment in 2012, versus $20 billion for conventional oil and gas. Historically most of the investment has originated from Canada, the US and Europe, but investments from Asia have increased substantially in recent years. Foreign countries with investments in Alberta’s oil sands include China, Japan, Korea, Thailand, Norway, France, UK and the Netherlands.
If Alberta were a US state it would be the third largest by area, just barely behind Texas. The oil sands deposits are spread across an area slightly larger than New York state. Of the nearly 55,000 square miles of oil sands formation, 1,853 square miles have been identified as being close enough to the surface for mining. To date, 276 square miles have been disturbed by surface mining, and 27 square miles are under active reclamation.
Source: Government of Alberta
Most of the oil sands production thus far has come from surface mining, and this is the technique that has attracted the most environmental criticism. Surface mining is feasible when the oil sands are relatively close to the surface. In order to produce oil sands from surface mines, any harvestable timber is sold and the overburden — which consists of 30 to 40 meters of peat, clay, and sand — is removed and set aside for future reclamation. The oil sands are then removed from the open pit and placed in dump trucks capable of carrying loads of 400 short tons. The trucks themselves weigh 250 tons, so a fully-loaded truck weighs 1.3 million pounds.
The trucks transport the ore to a processing facility where it is dropped into a crusher, mixed with hot water, and then piped to the plant. The mixture is put into large separation vessels where the bitumen is removed in the top layer, and the bottom layer of sand and some residual bitumen is sent to the infamous tailings ponds where it will eventually be buried, before the land above the tailings pond is eventually reclaimed (after 30-40 years of use). The recovery rate for bitumen from surface mines is over 90 percent.
Bitumen recovered from oil sands can be upgraded through various processes to a lighter oil (syncrude), as well as to products such as naphtha, diesel, and gas oil. Alternatively, the bitumen can be mixed with a diluent like naphtha to form dilbit, which can then be transported by pipeline or rail. (Unheated bitumen has a consistency like tar, and has to be upgraded, diluted, or heated to flow).
Companies involved in surface mining of oil sands include Canadian Natural Resources, Suncor Energy (NYSE: SU, TSE: SU), Canadian Oil Sands (TSE: COS), and Imperial Oil (NYSE: IMO, TSE: IMO). The Muskeg River mine is a joint venture between Shell Canada (60 percent), Chevron Canada (20 percent), and Marathon Oil Canada (20 percent).
In Situ Production
But the vast majority of future oil sands growth is expected to come from in situ (Latin for “in position”) production. As of January 2013 there were 127 operating oil sands projects in Alberta, and only 5 were mining projects. Production from both methods is expected to continue to grow, but the vast majority of the oil sands resource is too deep to be mined. Thus, most future production growth will be in situ production.
In situ production involves injecting steam into the ground to enable the oil to flow freely. The oil is then pumped to the processing facility. In situ production has the advantage of a much smaller surface footprint, since it doesn’t require the removal of overburden from the surface above the deposit. Nor does it require extensive tailings ponds.
There are two primary methods of in situ bitumen production. Cyclic Steam Stimulation (CSS), or the “huff-and-puff” method, was first used commercially in Alberta by Imperial Oil at Cold Lake in 1985. This technique involves the injection of steam into the formation for a period of time, followed by an extraction period in which the oil is pumped out. When the oil flow slows to a certain point, steam is once more injected. This cycle continues until the well is no longer economical. (One reader wrote to point out that CSS was behind this environmental mess where oil came bubbling up through the ground in Alberta).
The other in situ method is called steam assisted gravity drainage (SAGD), and it was enabled by the same horizontal drilling improvements that enabled the hydraulic fracturing revolution. SAGD was first commercialized in 2001 by Cenovus at Foster Creek, and its commercial application was the single biggest reason that Canada’s oil reserves more than quadrupled in the past 20 years. Once a technique makes it both technically viable and economical to produce a resource, it can be placed in the reserves category. Again, this is a similar situation to fracking, where resources in places like the Bakken and Eagle Ford became reserves when fracking made them economical to produce.
SAGD involves drilling a pair of horizontal wells, one about 5 meters above the other. Steam is injected into the upper well for months to heat up the bitumen. I learned from Cenovus that its initial projects required the company to inject steam for 18 months before producing oil, but as the engineers progressed up the learning curve the timing has been reduced to three months of steam injection prior to production. Steam injection continues throughout the life of the well, until the well begins to deplete. At that time steam injection ceases, but the wells continue to produce for a little while in this final phase of production. Once the wells start to produce, they have tended to produce almost without depletion for 10 years (a situation very unlike fracking, where wells initially deplete rapidly). The water that condensed when the steam was injected is also returned, separated from the oil, and reused in the process.
The horizontal wells can be drilled for miles in many directions from a single well pad, and as a result a large land area can be accessed without a huge environmental impact on the surface. A well pad such as the one I visited below can produce nearly 20,000 bpd of bitumen for 10 years before depletion begins to curtail production.
The advantage of SAGD versus surface mining is that the environmental impact is much smaller. The disadvantage is that the recovery rate from SAGD is much lower than for surface mining, with recovery factors for the oil in the range of 60-70 percent.
There are certainly environmental issues as documented in my previous two articles, but based on what I saw on my trip oil sands production growth is poised to remain high unless oil prices collapse. SAGD will lead the way, but production via surface mining is also expected to remain strong for the next two decades.
In next week’s article I will take a more in-depth look at the two companies that I visited on this trip — Cenovus Energy and Canadian Natural Resources Limited — and delve into their production costs and energy balance of their process. Following that, I will examine the logistical issues of getting the oil sands to market, including the impact of the Keystone XL decision (regardless of which way it goes).
Link to Original Article: How Alberta’s Oil Sands are Produced