Development and Evaluation of a Temperature-Sensitive Expandable Lost Circulation Material Made from a Shape Memory Epoxy Polymer
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摘要: 为避免当前常规惰性堵漏颗粒和吸水凝胶颗粒在堵漏应用过程中存在的问题,以热固性形状记忆环氧树脂作为基础材料,通过添加空心玻璃微珠改善了可压缩性能,形成了形状记忆环氧树脂复合泡沫,最后成功制备出具有不同响应温度和膨胀倍数的温敏可膨胀型智能堵漏剂SMP-LCM。通过控制形状记忆环氧树脂中交联组分含量,得到了不同响应温度区间(50~100℃)的形状记忆环氧树脂。通过控制体系中孔隙含量,得到了一系列不同膨胀率(5%~110%)的形状记忆环氧树脂泡沫及其颗粒。室内评价表明,SMP-LCM温敏堵漏剂可在温度激发下实现快速体积膨胀,且膨胀率不受介质种类影响,对大孔隙砂盘和砂床具有良好的封堵承压效果。所研发的形状记忆泡沫堵漏剂属于温敏膨胀型堵漏材料,能够以较小尺寸进入漏层深处并在地层温度下发生膨胀,通过自身因形状记忆效应产生的恢复应力有效加固井眼而又不致压裂地层,进而提高井筒薄弱地层承压能力,展现出了良好的应用前景。Abstract: To eliminate the problems encountered in mud loss control with regular inert particle lost circulation materials (LCM) and water-absorbing gel particles, a shape memory epoxy compound foam was developed with shape memory epoxy as the base material and hollow glass beads added into the epoxy to improve its compressibility. With the epoxy compound foam, an expandable smart temperature-sensitive LCM, SMP-LCM was developed. SMP-LCM can be made to have different response temperatures and expanding ratios. By controlling the concentration of crosslinking agent in the shape memory epoxy, shape memory epoxies of different response temperature ranges between 50 ℃ and 100 ℃ were obtained. By controlling the number of pores in the epoxy, shape memory epoxy foams of different expansion rates (5% - 110%) and the foam particles can be obtained. Laboratory experimental results showed that at the effect of temperature, SMP-LCM can expand very fast, and the expansion rate is not affected by the type medium in which the LCM is dispersed. This makes SMP-LCM very suitable for plugging sand discs and sand beds with big pores and rendering them high pressure bearing capacity. SMP-LCM is a temperature-sensitive expandable LCM, able to enter into the very depth of loss zones with small volume and expand at the effect of the temperature therein. In the loss zones, SMP-LCM, because of its shape memory effect, can produce a restoring stress with which the formation can be strengthened while not be fractured, thereby enhancing the pressure bearing capacity of the weak formations. With these characteristics, SMP-LCM has shown a perfect application prospect.
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Key words:
- Lost circulation /
- Shape memory /
- Epoxy /
- Temperature sensitive LCM
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