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首页> 外文期刊>SN Applied Sciences >Simulation study on the effect of reservoir bottom water on the performance of the THAI in‑situ combustion technology for heavy oil/tar sand upgrading and recovery
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Simulation study on the effect of reservoir bottom water on the performance of the THAI in‑situ combustion technology for heavy oil/tar sand upgrading and recovery

机译：储层底部水对泰国重油/焦油砂提质和回收原位燃烧技术性能影响的模拟研究

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摘要

Some of the bitumen/tar sand/heavy oil reservoirs are underlain by bottom water (BW) layer, which often severely affectsthe performance of thermal EOR (enhanced oil recovery) processes. The effect of bottom water on the performance ofthe toe-to-heel air injection (THAI) in-situ combustion (ISC) process is investigated through reservoir simulation usingCMG STARS simulator. The current study has shown that there is a limit to BW thickness above which the performanceof the THAI process is affected even though the combustion front propagated stably. It is found that the thickness of the‘‘basal gas layer’’ (BGL) depends on how further down into the BW zone the horizontal producer (HP) well is located. Fromthis study, it is found that the critical BW thickness, when the THAI process is implemented in any heavy oil BW reservoirwith the wells arranged in an SLD (staggered line drive) pattern, should lie in the range of 50% OL (oil layer) < BW (bottomwater) < 100% OL (oil layer). A comparative study between the active and non-active aquifers models shows thatthe same cumulative volume of water is produced and that over the 715 days of the process, only negligible amountof oil is produced from BWN (i.e. static aquifer model). It is found that in neither of the models does oxygen bypass thecombustion front and as in the previous studies, both fronts are restricted to the upper part of the reservoir, within theoil zone. Therefore, it follows that even in the presence of active aquifer (i.e. BWA model), the THAI process still operatesstably in terms of combustion front propagation and sustenance. For the combustion initiated at the oil–water (O–W)interface, it is found that controlled gravity override resulted in a high rate of advancement of combustion front at thetop of the reservoir. The combustion is observed to not propagate along the BGL, rather, it propagates as though it isinitiated at the top of the reservoir. It is shown that the BGL is only formed during the early period of air injection as thecombustion gases could not reach the HP well without displacing the water to create initial gas flow pathway into theHP well. It is also observed that initiating the combustion at the oil–water interface results in a massively improved oilrecovery rates, most especially when implemented in the DLD (direct line drive) pattern.
机译：一些沥青/焦油砂/重油储层的底部是水（BW）层，这通常会严重影响热采油（提高采收率）过程的性能。底水对砂浆性能的影响通过使用油藏模拟对脚趾到脚跟空气喷射（THAI）原位燃烧（ISC）过程进行了研究CMG STARS模拟器。当前的研究表明，BW厚度存在极限，超过该极限后，性能即使燃烧前沿稳定传播，THAI过程的影响也会受到影响。发现，厚度“基础气层”（BGL）取决于水平生产井（HP）井到BW区的距离。从这项研究发现，当在任何重油BW油藏中实施THAI工艺时，临界BW厚度井以SLD（交错线驱动）模式排列时，应在OL（油层）

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