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首页> 外文会议>SPE Kingdom of Saudi Arabia Annual Technical Symposium and Exhibition >Reducing Excessive Water Production Associated with Gas Hydrate Reservoirs Using a Thermal In-Situ Heating-Inhibitor Method
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Reducing Excessive Water Production Associated with Gas Hydrate Reservoirs Using a Thermal In-Situ Heating-Inhibitor Method

机译：使用热原位加热抑制方法减少与天然气水合物储层相关的过度水生产

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Gas hydrates are one of the most abundant sources of energy present today. They are formed at high pressures and low temperatures, and contain mainly water and methane. When dissociated, a large volume of water forms, much of which is produced. This research performs a simulation study on how to decrease the volume of water produced from gas hydrate reservoirs by utilizing an in-situ heating method combined with a low concentration thermodynamic inhibitor injection. Since gas hydrates form at high pressures and low temperatures, depressurizing the reservoir, or increasing its temperature would cause the solid hydrates to become unstable, and dissociate. The research begins by building a hydrate reservoir model using almost the same description of the models present in the literature in order to compare the results obtained. Several simulation runs were then performed using various production methods, several types of inhibitors, and finally testing and optimizing the newly proposed production method which combines thermal stimulation with inhibitor injection. The optimization process involves testing the novel method using 5-spot, 7-spot, and 9-spot production methods. The effect of each variable on the water recovery was studied, and the conditions under which the lowest water recovery were obtained. The highest water production occurred during glycol injection since it had the largest endurance to hydrate reformation and thus the largest water flow duration. When the glycol was combined with the thermal stimulation method however, the lowest water recovery was obtained. This is mainly due to two factors which include high rate of depletion of reservoir pressure, and the significant decrease in glycol concentration when used with thermal stimulation. This novel production method was chosen as the best method in terms of low water recovery based on a comparison of its recovery with that of all the other methods. The second task was to further optimize this method by introducing several well patterns and comparing their performance to that of the single well case. The largest number of wells, 9-spot pattern, was found to have the lowest water recovery due to the extremely high rate of reservoir pressure depletion. Gas hydrate production is still considered in its preliminary steps due to the complexity of hydrate reservoirs. By understating the mechanism by which these reservoirs can flow, and trying to reduce the excessive water production associated with these reservoirs a better understating of how to economically and safely produce from gas hydrate reservoirs is reached. This may lead to the utilization of this source of energy in the near future.
机译：天然气水合物是今天最丰富的能量源之一。它们形成在高压和低温下，主要含有水和甲烷。在解离时，大量的水形式，其中很多。这项研究进行对如何减少的通过利用原位加热方法具有低浓度的热力学抑制剂注射组合从天然气水合物油气藏产出水容积的模拟研究。由于天然气水合物在高压和低温下，减压储存器，或者增加其温度会导致固体水合物变得不稳定，并解离。该研究开始通过使用文献中存在的模型的几乎相同的描述来建立水合物储库模型，以便比较所获得的结果。然后使用各种生产方法，几种类型的抑制剂进行几种模拟运行，以及最终测试和优化结合热刺激与抑制剂注射的新提出的生产方法。优化过程涉及使用5点，7点和9点生产方法测试新方法。研究了每个变量对水回收的影响，并获得了最低水回收的条件。在乙二醇注射期间发生的最高水产产生，因为它具有最大的水合物改造，因此具有最大的水流动持续时间。然而，当二醇与热刺激方法结合时，获得最低的水回收。这主要是由于两个因素包括储层压力的高耗尽率，以及热刺激时乙二醇浓度的显着降低。基于其回收与所有其他方法的复苏的比较，选择了这种新的生产方法作为低水回收率的最佳方法。第二任务是通过引入几个井模式并将其性能与单个井外壳的性能进行比较来进一步优化该方法。由于极高的储层压力耗尽率，发现了最多的井，9点图案具有最低的水回收。由于水合物储存器的复杂性，仍然认为气体水合物生产仍然被认为是其初步步骤。通过低估这些储存器可以流动的机制，并且试图减少与这些储存器相关的过度的水产生，更好地低估了如何从气体水合物储存器中经济和安全地产生。这可能导致在不久的将来利用这种能源来源。

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