Characteristic Study of Thermosensitive Shape Memory Lost Circulation Materials
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摘要: 为改善桥接堵漏材料自适应性及封堵效率，提高复杂裂缝性地层堵漏作业的成功率，基于温敏型形状记忆材料，研制了一种具有热激活特性的形状记忆堵漏剂，经过粉碎、造粒得到不同粒径的形状记忆堵漏剂颗粒。室内评价实验表明，新研制的温敏形状记忆堵漏剂具有良好的力学性能及形状记忆特性，堵漏剂颗粒高温激活后粒径增长率超过55%。裂缝封堵模拟实验表明，温度对温敏形状记忆堵漏剂的封堵效果具有显著影响，高温激活后封堵效果优于传统桥接堵漏材料。构建出一套具有较强自适应性的温敏形状记忆堵漏工作液配方，可成功封堵3～5 mm不同开度裂缝，具有高效自适应堵漏效果。Abstract: In order to improve the self-adaptability and plugging efficiency of bridging materials and increase the success rate of plugging fractured formation, this paper develops a kind of thermosensitive shape memory lost circulation materials. By crushing and granulating, shape memory particles with different sizes were obtained. Evaluation experiments show that the mechanical properties and shape memory performance of thermosensitive shape memory lost circulation materials are preferable, and the particle size growth rate under high temperature activation is more than 55%. The simulation experiments of fracture plugging show that the temperature has a significant influence on the plugging effect, and the plugging effect of thermosensitive shape memory lost circulation materials is better than that of traditional bridging materials under high temperature. Building a set of formula of plugging fluid with strong self-adaptability, it can successfully plug 3-5 mm coexisting fractures, achieving adaptive and high-efficiency plugging.
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表 1 温敏形状记忆聚合物抗压性能
T测试/ ℃ 形状记忆聚合物 固化剂/% p/MPa 20 SMEP-1 28 69.06 SMEP-2 31 74.58 SMEP-3 34 82.32 100 SMEP-1 28 10.92 SMEP-2 31 14.12 SMEP-3 34 19.81 
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表 2 温敏形状记忆聚合物形状记忆性能参数
形状记忆聚合物 形状回复率/% T激活/℃ T形状回复结束/℃ SMEP-1 98.3 56 81 SMEP-2 96.6 68 97 SMEP-3 97.1 79 108
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表 3 颗粒粒度区间划分标准
目数 粒径/mm 目数 粒径/mm 6～10 3.350～2.000 20～40 0.850～0.425 10～20 2.000～0.850 40～80 0.425～0.180
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表 4 不同温度下裂缝封堵实验结果
裂缝开度/（mm×mm） T/℃ 封堵层突破压力/MPa FL/mL 3×2 20 0 全漏 80 3.5 284 100 6.7 160 4×3 20 0 全漏 80 1.1 全漏 100 4.0 210
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表 5 不同类型堵漏材料裂缝封堵实验结果
堵漏材料 封堵
配方封堵层突破
压力/MPa漏失量/
mL温敏形状记忆堵漏剂 1# 6.7 160 碳酸钙颗粒 2# 0 全漏 碳酸钙颗粒 3# 2.7 358 弹性橡胶颗粒 4# 0 全漏 弹性橡胶颗粒 5# 1.9 426
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表 6 不同类型堵漏材料协同封堵实验结果
颗粒类型 封堵配方 封堵层突破压力/MPa 漏失量/mL 形状记忆颗粒 1# 6.7 160 形状记忆颗
粒+刚性颗粒6# 8.0 145 形状记忆颗
粒+弹性颗粒1#+2% RUB
(40～80目)6.9 102 形状记忆颗
粒+纤维1#+0.2% FIB
(6～12 mm)7.3 153
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表 7 自适应协同堵漏体系的封堵性能
裂缝开度/
（mm×mm）T/
℃封堵层突破压力/
MPa漏失量/
mL3×2 100 9.3 55 4×3 100 10.6 71 5×4 100 9.7 106 注：4%SMEP（6～10目）+3%SMEP（10～20目）+1% SMEP（20～40目）+3%GDJ（6～20目）+2%GDJ（20～40目）+2%GDJ（40～80目）+2%RUB（40～80目）+0.2%FIB
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