The basis of the process is that the injected steam forms a "steam chamber" that grows vertically and horizontally in the formation. The emitted CO2 is not easily captured for sequestration. Another drawback of very high sub-cool is the possibility of steam pressure eventually not being enough to sustain steam chamber development above the injector, sometimes resulting in collapsed steam chambers where condensed steam floods the injector and precludes further development of the chamber.
ET-DSP is a patented process that uses electricity to heat oil sands deposits to mobilize bitumen allowing production using simple vertical wells. Steam is continuously injected into the injector top well, saturating a space between the wells with steam Butler, Another variation sometimes called Partial SAGD is used when operators deliberately circulate steam in the producer following a long shut-in period or as a startup procedure.
Associated gas forms, to a certain extent, an insulating heat blanket above and around the steam. Sub-cool is the difference between the saturation temperature boiling point of water at the producer pressure and the actual temperature at the same place where the pressure is measured.
There has been a significant reduction in fresh water use as ofwhen approximately 18 million cubic metres were used. However, the more recent steam-assisted gravity drainage technique SAGD is better suited to the much larger deep deposits that surround the shallow ones.
A source of large amounts of fresh and brackish water and large water re-cycling facilities are required in order to create the steam for the SAGD process. Butler likely had access to the resources e. The process of claim 25 wherein the fuel for combustion and the source of bitumen in the hot bitumen zone is residual bitumen in the steam-swept zone, combustion being contained inside of the steam chamber.
The coatings of the optical fiber and the extrusion can be tailored to optimally suit the required resistance to temperature conditions and mechanical impacts. But Pfefferle 1 doesn't focus on bitumen but uses the term oil or heavy oil.
The cyclic steam stimulation CSS process developed for the California heavy oil fields was able to produce oil from some portions of the Alberta oil sands, such as the Cold Lake oil sandsbut did not work as well to produce bitumen from heavier and deeper deposits in the Athabasca oil sands and Peace River oil sandswhere the majority of Alberta's oil sands reserves lie.
Butler had to overcome the fact that the petroleum industry was highly conservative and skeptical of new processes.
Imperial Oil and Cenovus, two users of this process, drill wells with vertical distances of SOR for different thermal methods.
The way this is done is as follows: There is a 60 m to m spacing for horizontal wells. Bitumen is a very heavy type of oil that is essentially immobile at reservoir conditions, so it is difficult to recover. SAGD SAGD involves injecting steam underground through a horizontal well to liquefy the bitumen and pump it to the surface for further processing.
All other rights, including commercial rights, are reserved to the author. The process of claim 1, 2 or 3 wherein the oxygen-containing gas is air.
If the well separation is increased from say 5 to 10 meters, the effective well length or injectivity can be increased, but the start up period is prolonged significantly.
The process is relatively insensitive to shale streaks and other vertical barriers to steam and fluid flow because, as the rock is heated, differential thermal expansion allows steam and fluids to gravity flow through to the production well.
According to yet another aspect of the invention there is provided a method of starting up of a SAGDOX process described herein comprising the following steps: Energy Efficiency All of the methods described above require steam to be generated on the surface and injected into the petroleum reservoir.
A SAGD horizontal well pair wells 1 and 2 has been augmented by 3 new vertical SAGDOX wells—2 wells to remove non-condensable combustion gases wells 3 and 4 and a separate oxygen injection well well 5.
The injection and production phases together comprise one cycle. Combustion will always occur in the steam-swept zone, using a coke fraction of residual bitumen as a fuel. In other words, the lower the quality of the reservoir, the lower the oil rate, and the higher the SOR.
The combustion zone will always be far away from the steam chamber walls. Disadvantages Oil and water nexus SAGD, a thermal recovery process, consumes large quantities of water and natural gas. Steam-assisted gravity drainage (SAGD) It wasn’t that long ago that drilling in the oil sands was thought to be impossible.
The oil in the oil sands can at times be as hard as a hockey puck and it’s embedded in tonnes of sand deep underground. We have to use a drilling method to get the oil out of the ground.
We present a lab-on-a-chip approach to informing thermal oil recovery processes. Bitumen – a major global resource – is an extremely viscous oil which is extracted by injecting steam underground in a process known as Steam Assisted Gravity Drainage (SAGD).
Cenovus's steam-assisted gravity drainage (SAGD) process softens deposits in the oil sands so they can be pumped to the surface. Focus is on low water use. Abstract Steam-assisted gravity drainage (SAGD) is a promising approach for recovering heavy and viscous oil resources.
In SAGD, two closely-spaced horizontal wells, one above. Basilio Companies oil fracking services. Basilio Companies Steam Assisted Gravity Drainage.
Nitrogen Assisted Gravity Drainage. West Texas Permian Shale. Numerical Simulation of Steam-Assisted. Gravity Drainage With Vertical Slimholes J. Chang, Devon Canada; and J. Ivory and C. Tunney, Alberta Innovates–Technology Futures Summary Steam-assisted gravity drainage (SAGD) is the primary in-situ recovery method for bitumen from the large Athabasca deposit in Alberta, Canada.Steam assisted gravity drainage