摘要：In the development of deep shale oil and gas, the working temperature of the water-based drilling fluids is relatively high, which can cause wellbore instability due to the poor temperature resistance of the traditional environmental-friendly additives. To address this issue, this study presents a wellbore stabilizer called PMG, prepared by modifying gelatin (GT) with a resin synthesized by polyvinyl alcohol (PVA) and methacrylic acid (MA) through hydrothermal free radical polymerization, and it can withstand temperature up to 200 掳C. The synthesis and thermal stability of PMG were confirmed by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). The wellbore stability performance of PMG was evaluated by linear swelling test, rolling recovery test, core immersion experiment and point load test and the wellbore stability mechanism was also investigated. The results reveal that the swelling height of sodium-based bentonite (Na-BT) in 2.0 % PMG solution at 150 掳C is only 0.97 mm; the hot-rolling recovery rate in 2.0 % PMG solution at 200 掳C is 72 %; the artificial core still maintains its original appearance after being immersed in 2.0 % PMG solution at 200 掳C for 16 h, and the compressive strength increases by 12 %, effectively strengthening the wellbore. In addition, the EC50 value of PMG is > 106 mg/L, and the BOD5/CODcr value is 31 %, indicating that it is non-toxic and biodegradable. PMG has excellent wellbore stability performance, in addition to being able to adsorb on the surface of Na-BT by electrostatic action and hydrogen bonding, the PMG micelles that precipitated from the aqueous solution due to the breaking of hydrogen bonds in the molecular chain at high temperature also form a film on the clay surface, aggregating and cementing the clay particles together, further enhancing the wellbore stability. 漏 2024 Elsevier B.V.

ISSN号：0167-7322

卷、期、页：卷411

发表日期：2024-10-01

期刊分区（SCI为中科院分区）：二区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Journal of Molecular Liquids

通讯作者：王奕杰,王倩男,王星星

第一作者：蒋官澄,贺垠博,杨丽丽,董腾飞

论文类型：期刊论文

论文概要：王奕杰,蒋官澄,王倩男,贺垠博,杨丽丽,董腾飞,王星星，Research on resin modified gelatin as environmental-friendly high temperature resistant wellbore stabilizer，Journal of Molecular Liquids，2024，卷411

论文题目：Research on resin modified gelatin as environmental-friendly high temperature resistant wellbore stabilizer