多重乳液型深部调剖剂的研制及其性能评价
发布时间：2019-06-12 17:47
【摘要】：目前,我国大部分油田都已进入高含水期,高含水油藏水驱“短路”问题明显。交联聚合物凝胶是应用最广泛的深部调剖剂,其胶体粘度高、抗剪切性良好能够进行有效调堵,但传统交联聚合物凝胶调剖剂易受温度、矿化度、吸附等不利因素影响,导致成胶性能不稳定,交联剂容易在近井地带被吸附。因此,研制成胶性能稳定、运移性能良好的深部调剖剂具有重要的意义。本文通过正交实验和单因素分析考察了油相、表面活性剂、相比等因素,得出最佳制乳条件,采用两步法制备出稳定的W/O/W型多重乳型液调剖剂。通过考察20℃和60℃下,不同内水相组成的多重乳液中交联剂的释放速率,并以W/O/W多重乳液离子的扩散作用和菲克定律为基础,结合实验动力学数据建立了预测W/O/W多重乳液离子释放速率动力学模型。还研究了多重乳液调剖体系与传统凝胶调剖体系的成胶性能对比,并分别考察多重乳液调剖体系的耐温性、耐盐性等成胶性能。研究结果表明:当亲油性乳化剂T161加量4%、亲水性乳化剂Tween 80加量2%,初级乳液制备温度50℃、内水相:油相=1:1.5、初级乳液:外水相=1:2时,制得的W/O/W型多重乳液分散性能良好,包埋率高达97%,分层率小于10%,在室温下静置一个月不分层,在60℃下12天内不分层;当内水相中存在螯合剂时,多重乳液中交联剂的释放速率显著降低,有利于延缓释放。实验的动力学数据与基于扩散和螯合作用的W/O/W多重乳液离子释放速率动力学模型一致性较好。在60℃下,由3%的多重乳液和2000 mg/L的聚丙烯酰胺组成的多重乳液型调剖体系成胶时间为6~7天,粘度可达2400~2800mPas;与传统的交联聚合物凝胶相比,制备的W/O/W型多重乳液调剖体系具有明显的延缓成胶性能,在矿化度范围是6000~14000 mg/L、pH值为6~10的地层条件适应能力较强,但对温度比较敏感,不适宜在高温油藏进行调剖作业。
[Abstract]:At present, most of the oilfields in China have entered the stage of high water cut, and the problem of "short circuit" of water drive in high water cut reservoirs is obvious. Crosslinked polymer gel is the most widely used deep profile control agent. Its colloid viscosity is high and its shear resistance is good. However, the traditional crosslinked polymer gel profile control agent is easily affected by temperature, salinity, adsorption and other unfavorable factors, resulting in unstable gelation performance and easy adsorption of crosslinker in the near well zone. Therefore, it is of great significance to develop a deep profile control agent with stable gelation performance and good migration performance. In this paper, the oil phase, surfactants and comparison factors were investigated by orthogonal experiment and single factor analysis, and the optimum emulsion conditions were obtained. The stable W/O/ W multi-emulsion liquid profile control agent was prepared by two-step method. The release rate of crosslinker in multiple emulsion composed of different internal aqueous phases at 20 鈩，
本文编号：2498191
[Abstract]:At present, most of the oilfields in China have entered the stage of high water cut, and the problem of "short circuit" of water drive in high water cut reservoirs is obvious. Crosslinked polymer gel is the most widely used deep profile control agent. Its colloid viscosity is high and its shear resistance is good. However, the traditional crosslinked polymer gel profile control agent is easily affected by temperature, salinity, adsorption and other unfavorable factors, resulting in unstable gelation performance and easy adsorption of crosslinker in the near well zone. Therefore, it is of great significance to develop a deep profile control agent with stable gelation performance and good migration performance. In this paper, the oil phase, surfactants and comparison factors were investigated by orthogonal experiment and single factor analysis, and the optimum emulsion conditions were obtained. The stable W/O/ W multi-emulsion liquid profile control agent was prepared by two-step method. The release rate of crosslinker in multiple emulsion composed of different internal aqueous phases at 20 鈩，
本文编号：2498191
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