Design Considerations of Waterflood Conformance Control With Temperature-Triggered, Low-Viscosity Submicron Polymer
Design Considerations of Waterflood Conformance Control With Temperature-Triggered, Low-Viscosity Submicron Polymer
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DOI：
10.2118/153898-pa
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发表时间：
2012-10-01
影响因子：
2.1
通讯作者：
Shook, G. M.
中科院分区：
文献类型：
--
作者：
Izgec, O.;Shook, G. M.
在注水开发中，高导电盗流层的存在导致体积波及效率差，导致早期突破和过量产水。通过关闭射孔来改变注入方向的传统策略会产生短期效益，因为导流发生在井眼附近。作为替代方案，近年来引入了低粘度的温度触发亚微米聚合物（爆裂剂），它为储层深处的一致性控制提供了机会。该技术通过堵塞高渗透区并将流体转移到储层的未波及部分来辅助达标控制。了解成功处理的关键参数和准确确定段塞尺寸是技术和经济上成功处理的两个重要标准。在本研究中，我们首先研究不同参数对一致性控制治疗成功的影响。综合实验设计 (DOE) 研究解决了 k(v)/k(h)、处理液浓度、窃贼区与基质渗透率比、流度比以及储层中放置位置的影响（以及综合影响）。接下来，开发了一种方法来准确确定一致性块尺寸。该方法建立在井间示踪剂的时间矩和停留时间分布分析（RTDA）的基础上。动态流量和存储容量曲线用于确定最佳段塞尺寸。3D 热计算机模拟表明，窃流区与基质渗透率的比率以及聚合物的放置位置是影响处理成功的最重要参数。最理想的设置是将聚合物放置在储层深处，靠近高 k(i)/k(h) 储层中的生产井。此外，计算机模拟证实了新技术确定最佳段塞尺寸的能力。这项新技术可以避免低估必须治疗的体积，这对于治疗的成功至关重要。
In waterfloods, the existence of highly conductive thief zones causes poor volumetric sweep efficiency, resulting in early break-through and excessive production of water. A conventional strategy of redirecting injection by closing off perforations yields short-term benefits because diversion occurs near the wellbore. As an alternative, temperature-triggered submicron polymers with low viscosity (popping agents), which give an opportunity for conformance control deep in the reservoir, have been introduced in recent years. This technology aids conformance control by plugging the high-permeability zones and diverting the fluid to the unswept portion of the reservoir.Understanding the critical parameters that lead to a successful treatment and accurate determination of the slug size are two important criteria for a technically and economically successful treatment. In this study, we first investigate the effect of different parameters on the success of a conformance control treatment. A comprehensive design-of-experiments (DOE) study resolves the effects (and combined effects) of k(v)/k(h), treatment fluid concentration, thief-zone to matrix-permeability ratio, mobility ratio, and location of the placement in the reservoir. Next, a methodology is developed for accurate determination of the conformance slug size. The method is built on the temporal moment and residence time distribution analysis (RTDA) of interwell tracers. Dynamic flow- and storage-capacity curves are used to identify the optimum slug size.3D thermal computer simulations show that thief-zone to matrix-permeability ratio and placement location of the polymer are the most important parameters that affect the success of a treatment. The most desirable setting is placement of the polymer deep in the reservoir, closer to the producer within high k(i)/k(h) reservoirs. Furthermore, the computer simulations confirm the power of the new technique for optimal slug-size determination. This new technique can avoid underestimation of the volume that must be treated, which is critical for the success of a treatment.