1，2-丙二醇基改性瓜尔胶合成及其压裂液性能

Synthesis of Dihydroxypropyl Modified Guar Gum and Its Application in Fracturing Fluids

叶应庆

YE Yingqing

针对现有改性瓜尔胶作为水基压裂液材料存在溶解性与交联性能相互矛盾问题，采用3-氯-1，2-丙二醇改性瓜尔胶合成1，2-丙二醇基改性瓜尔胶DHPG，在瓜尔胶分子链中引入具有交联功能的改性基团1，2-丙二醇基来同时改善瓜尔胶的溶解性及交联性能，对合成的DHPG进行化学结构分析，并测试了DHPG理化指标及在水基压裂液的应用性能。研究结果表明：经过1，2-丙二醇基改性的瓜尔胶，可有效降低瓜尔胶中的水不溶物含量，增加溶解速度，提高与硼类交联剂的交联性能。在压裂液配方应用中，DPHG与现有改性瓜尔胶相比表现出更加优秀的耐温性能，更低的使用量以及残渣含量。通过优化DHPG的取代度及压裂液配方，可实现小于20 mg/L超低残渣、耐 160 ℃超高温压裂液需求。以1，2-丙二醇基取代为基础的改性瓜尔胶材料，具备较好的应用开发前景。

In order to solve the contradictory problem of solubility and cross-linking performance of the existing modified guar gum as a water-based fracturing fluid material，a fracturing fluid thickener dihydroxypropyl modified guar gum（DPHG）was synthesized by reaction of 3-chloro-1，2-propanediol and guar gum. The structure of the DPHG was characterized. The physical and chemical properties of the DPHG and its application performance in water-based fracturing fluids were also investigated. Research results showed that content of water insoluble substances of DPHG could effectively be reduced，the dissolution rate could be increased， and the crosslinking performance with boron crosslinking agents could be improved. In the formulation application of fracturing fluid，DPHG showed better temperature resistance，lower usage and residue content than that of the existing modified guar gum. By optimizing the design of the substitution degree of DPHG，the fracturing fluid could be obtained with temperature resistance of 160 ℃，and the residue content of the fracturing fluid after gel breaking could be reduced to below 20 mg/L，which indicated that DHPG had good application prospect.

10.19346/j.cnki.1000-4092.2024.03.004