Steam assisted gravity drainage

It is clear that as the reservoir thickness increases, the cumulative oil recovery increases as well. Whereas in SAGD, only the bitumen, and steam condensate are extracted.

Prior processes, such as CSS, extract all fluids in deposit, including the steam in the production phase Patton, Butler responded to these two barrier by exiting the organization for opportunities in the public sector and at a university, which would allow him to pursue to develop the SAGD process for more suitable locations while largely insulating himself and the development of SAGD from the unfavorable economic environment Patton, This ignores trace components S, N, O.

Results obtained from experiments showed that co-injection of gas condensate with steam causes more oil to be drained and produced using much lower amounts of steam relative to the baseline SAGD experiment which implies that early gas condensate with steam is extremely beneficial to accelerate the establishment of inter-well communication between SAGD injection and production wells.

A central steam plant can only service a limited area. Combustion was purported to occur at the bitumen interface the chamber wall and combustion temperature was controlled by adjusting oxygen concentrations. This greater thermal efficiency, reduces the cost of heat, and consequently the quantity of natural gas required to produce a barrel of bitumen Abbas Naqvi, In situ combustion ISC is an alternative process that, so far, has shown little application for bitumen recovery.

The development can be as low as 7 m net pay. Case Study on Surmont Pilot Project.

Steam Assisted Gravity Drainage (SAGD)

Early applications were for medium and heavy oils not bitumenwhere the oil had some in situ mobility. Injection is at fracture pressure.

Multiple bleed wells are also proposed. The process of claim 26 wherein hot combustion gases transfer heat to bitumen, in addition to steam mechanisms. But, if we have a modern geometry suited to bitumen recovery, we have short paths between wells.

But, as shown by Yang, combustion will not occur at the chamber walls. But to sustain HTO combustion we need a constant supply and a minimum flux of oxygen, otherwise we will breakthrough oxygen to producer wells or start LTO combustion.

Vertical well geometry will not easily work for bitumen EOR. Parrish because of the long distance between injector and producer and the ability to segregate liquid water from the combustion zone until it is vaporized.

The dead oil density and viscosity are approximately The mechanisms were well documented. Because it is a saturated-steam process and only latent heat contributes directly to bitumen heating, if pressure is raised higher than native reservoir pressure the temperature of saturated-steam is also increased, Bitumen can be heated to a higher temperature, viscosity reduced and productivity increased.

Results from temperature profiles within the model of SAGD baseline and gas condensate ES-SAGD experiments showed that same amount of oil can be produced using ES-SAGD with gas condensate while having lower temperatures within the sand matrix due to combined benefits of heat and mass transfer.

It is usually applied with a single vertical well. In situ processes possess numerous economic, and social advantages compared to mining.

Secondly, in situ processes disturb much less land than mining operations, and do not require tailings ponds Canadian Association of Petroleum Producers, Gravity allows the less viscous oil to fall into the well drilled below the reservoir where pumps take it to the surface.

Asphaltene content in original oil used to saturate sand pack experiment 2,3,4 was The vertical well has a dual completion and is located near the heel of the production well.

It is a once-through water process. It is clear that the heating period has minimal effect on the cumulative oil recovery, steam oil ratio and water oil ratio.

All of these methods still use steam to heat oil sand deposits for harvesting and recovering purposes. Fast-steam-assisted gravity drainage incorporates cyclic steam stimulation in an unrecovered area between steam-assisted gravity drainage wellpairs, and the well constraints of the wellpad system (including the injection pressure and steam injection rate at the injectors, bottom hole pressure, surface liquid rate, and steam rate at the producers) are simultaneously optimized to accomplish the minimum.

Steam assisted gravity drainage

Steam is injected into the reservoir through the upper well. As the steam rises and expands, it heats up the heavy oil, reducing its viscosity. Gravity forces the oil to drain into the lower well where it is produced. in Steam-Assisted Gravity Drainage Wells Shaelyn Gordon, Adriana Hightower, SPE, and Nadine Macklin, Baker Hughes Fig.


1—The Equalizer retrofit system installed in a steam-assisted gravity drainage producing well. The wellbore above the producing bore is the steam chamber. Did you know? All your burning filmmaking questions have answers. Find them in Vimeo Video School. Steam assisted gravity drainage (SAGD) is an outstanding example of a steam injection process devised for a specific type of heavy oil reservoir utilizing horizontal wells.

It is widely used in Alberta, Canada for recovery of heavy oil and tar sand resources. Steam assisted gravity drainage or SAGD is a method that is widely used to extract bitumen from underground oil sands deposits. This method involves forcing steam into sub-surface oil sands deposits to heat the bitumen locked in the sand, allowing it to flow well enough to be extracted.

Steam assisted gravity drainage
Rated 4/5 based on 2 review
Steam-Oil Ratio