Sometime durig the initial stages of the optimization, the optimum dataset is found. Note that the production rate is a function of only two variables—oil viscosity and the heated radius. First steam is "injected for several weeks, mobilizing cold bitumen".
Sunshine continues to review several extraction techniques for development of our resources.
Process Optimization There are always the operational questions of how much steam should be injected during a cycle; what rate should steam be injected; when should a well be resteamed; etc. The success of in situ methods depends on the resolution of two major issues: Figure 10 —Cumulative oil production for cases studied for optimization.
Failure might be due to buckling of casing due to compressive loading, connection seal, cyclic loading due to temperature induced loading in cement void intervals and due to formation shear in reservoir and shale intervals.
Because steam only enters a small fraction of the sandface in a thick interval as in California oil fields, there is opportunity to improve performance of a steam cycle by using packers or other methods to divert steam into more of the oil zone.
This process is repeated until the cost of injecting steam becomes higher than the net revenue from producing the recovered oil. Pressure and temperature variation due to cyclic steam stimulation improves the recovery from reservoir and also impacts the stress behavior in reservoir thus making geomechanics critical in order to understand reservoir behavior.
The Towson and Boberg Model The Boberg and Lantz  method assumes that there is significant reservoir energy to produce oil under primary conditions. We advise all clients to read the TOC and Summary and list your questions so that we can get more insight for you before you make any purchase decision.
The production cycle of a CSS technique consists of the following stages: Once your order has been processed and the publisher has received a notification to send you the report, we cannot issue any refund or cancel any order.
Pore pressure is affected by pressure expansion of pore fluid, thermal expansion and rock matrix deformation and can be quantified as: Further, cyclic steam is easy to apply in the field and is relatively inexpensive, so most operators simply start immediately with a field trial.
Many California reservoirs have free liquid surfaces in the oil zones with a gas oil interface at atmospheric pressure. Vertical, deviated and horizontal wells are used and smart completion technology introduced. Injection time and injection rate are the operating parameters for this stage Azad, Alnuim and Awotunde, Concurrently, CADP for the cycle will begin to increase as the daily production begins to pay for the injection costs.
The number of cycles is controlled by the wellbore surrounding geological parameters and the fluid characteristics. When steam is injected into a producer, profits of the cycle are driven negative because of the cost of the steam, costs to prepare the well for steaming, and lost production as a result of the well being shut down.
While more steam is needed for this method than for the cyclic method, it is typically more effective at recovering a larger portion of the oil.
Next, the well is allowed to sit for days to weeks to allow heat to soak into the formation. The alternative to surface generated steam is downhole steam generation that reduces heat loss and generates high-quality steam in the reservoir that allows for more heavy oil and oil sands production at a faster rate.
Besides hydrofracturing, tight sands or tight Alvarez, Johannes, and Sungyun Han. A numerical technique for predicting subsidence above compacting reservoirs, based on the nucleus of strain concept. Figure 5—Cumulative water injection and cumulative oil production for the template case.
He extended the model by also calculating heated-zone water rate. Heated steam is injected into the upper well, where the build-up of pressure and heat melts the bitumen and causes it to flow downward to the second horizontal well, from which it is pumped to the surface.
Shen evaluates the impact of CSS operation on structural integrity of reservoir, it determines the correlation between surface deformation and subsurface displacement. He then used the history-match information to do a long-life parametric study of the process.
Surface deformation due to shear and tensile faults in a half-space. Do note that sometimes reports are sent within a 12 hour period, depending on the time zones. In each well pair, steam is injected into the upper well and the heat mobilizes the bitumen, which allows it to flow into the lower well, where it is pumped to the surface.
Once the well is put back on production, the oil rate will peak, and daily cash flow will be at a relative high. Currently, bitumen is recovered commercially using two major techniques.
We do a sensitivity analysis on the model in order to understand which parameters affect the production the most.
Geomechanical understanding of reservoirs subjected to CSS can help in understanding issues like low injectivity, reservoir drive and cap rock integrity. Xie, Jueren, and Yu Liu. Low friction boundary between shale and production zone can result in shear failure at boundary.
Extraction by natural flow and also by forced pumping.Cyclic Steam Stimulation and Other Uses of Horizontal Wells Horizontal wells are being used for cyclic steam stimulation, much in the same manner as vertical wells, in Cold Lake, Alberta, and in Eastern Venezuela. Steamflood design is simple compared to cyclic steam stimulation (CSS) design.
Whereas steamflood reaches equilibrium and can be represented by a set of steady-state equations for much of its life, the CSS process is one of constantly changing conditions. Home; About Us. About Us; Success Story; Our Offer. End Users; Engineering Companies & Contractors; OEMs – Manufacturers; Distribution & Local Services; Mergers.
Cyclic steam injection is used extensively in heavy-oil reservoirs, tar sands, and in some cases to improve injectivity prior to steamflood or in situ combustion operations. Cyclic steam injection is also called steam soak or the huff `n puff (slang) method.
6/12/Design and Implementation of Enhanced Oil Recovery Cyclic Steam Stimulation CSS Program in Bamboo West FieldSudan, Case Study OnePetr. Cyclic Steam Stimulation (CSS) Canadian Natural Resources use "employs cyclic steam or "huff and puff" technology to develop bitumen resources.
This technology requires one well bore and the production consists of the injection and production phases.Download