Execution towards full-field deploymentDownload PDF
Find cost-effective solutions for improving reservoir recovery factors
Cyclic Steam Injection (CSI)
Most E&P operators are challenged with finding cost-effective solutions for improving reservoir recovery factors. Well planned CSI can provide significant benefits such as increased production, and increased recovery factor. Additionally, the earlier an operator applies the method, the more likely they are to gain positive economic results.
Field pilot can provide valuable knowledge on the feasibility and potential of CSI, reduce the full field deployment risks, and increase the operator’s knowledge about the process. However, many field pilots take much longer than needed and are unsuccessful due to cost overruns, lack of clear results, inappropriate monitoring, disregard of important operations aspects, and lack of expertise.
The Halliburton method is a disciplined approach to CSI optimization that can determine the best scenario before beginning a pilot, reduce cost overruns due to trial and error, and reduce the amount of time to positive net present value. The CSI method can offer high final oil recoveries, with records indicating up to 65% of the OOIP when proper reservoirs are chosen, sound pilot designed, and execution par excellence. Halliburton can achieve this by acting as an integrated service provider with complete oversight of the entire process from visualization to evaluation of the pilot. Halliburton’s approach offers the possibility of successfully executing a pilot prior to extending the technique in a cost-effective fashion.
A multidisciplinary NOC-Halliburton team developed a pilot design based on results from the integrated reservoir study. The diagnosis study shows a steam-to-oil ratio (SOR) of 0.33 that increased cost efficiency about 9 times compared to the average as shown in the figure below.
Hot oil (first cycle of steam injection) was 11 times higher than cold which is 3 times higher than the worldwide average.
CSI is ideal for viscous oil reservoirs with good horizontal permeability and medium thickness net pay. Non fractured sandstones are preferred, but deployment in carbonate is also possible.
Typically, CSI is implemented right after the primary exploitation phase and in some cases as a previous step for steam flooding.
Halliburton offers a tailored solution at any stage of your field’s life by using a five-phase approach. The main advantage of the approach is that the operator can start the process at their convenience.
The above phases can provide clients:
An operator’s main concerns such as length of injection cycle, amount of steam to be injected, water source, conditions for water treatment plant or building and operating restrictions can be addressed to optimize conditions for the pilot.
Deliverables include a representative pilot area, well integrity analysis, rock and fluids characterization, suitable laboratory work program to evaluate changes in oil saturation during steam injection, numerical simulation, facility design, construction and operation among others.
Estimated project duration including execution and monitoring of a pilot is in the order of 24 months. Start of commercialization phase relies on the pilot’s response.
In summary, the Halliburton’s Five Phases approach can provide a structured outlook including uncertainty, economics and risks for the pilot and first-cut economic forecasts for full field implementation.