低密度固井液体系在深井作业中的化学特性与应用  

Chemical Properties and Applications of Low-density Cementing Fluid Systems in Deep Well Operations

作　　者：曾丰燕 李锋 张武刚[3] ZENG Fengyan;LI Feng;ZHANG Wugang(Ziyang Dental Vocational College,Ziyang 641300,China;China Petroleum Changqing Oilfield Branch Fifth Gas Production Plant,Ordos 017300,China;Xi'an University of Petroleum,Xi'an 710065,China)

机构地区：[1]资阳口腔职业学院,四川资阳641300 [2]中国石油长庆油田分公司第五采气厂,内蒙古鄂尔多斯017300 [3]西安石油大学,陕西西安710065

出　　处：《化学与粘合》2024年第3期244-247,282,共5页Chemistry and Adhesion

基　　金：国家自然科学基金青年科学基金(编号:52304036)。

摘　　要：对低密度固井液在高温高压条件下的流变性能、稳定性、抗压强度以及环保性进行了综合评价。实验结果表明:当固井液密度从1.0 g·cm^(-3)增加到1.6 g·cm^(-3)时,室温下的塑性黏度从10.4 m Pa·s显著增加至27.9 m Pa·s,而在80℃和120℃下,塑性黏度分别增至42.0 m Pa·s和56.1 m Pa·s,表明了密度和温度升高导致的分子间摩擦力增强。固井液的塑性黏度从1 0.0 m Pa·s增加到40.0 m Pa·s时,携岩指数相应地从2.0提升至6.0。此外,在1 35℃和85 MPa条件下测试的固井液稠化时间显示,过渡时间(30至100 Bc)低于30 min,突显出其优秀的防窜性能。低密度固井液在150 d的实验期内对水生生物的急性毒性从初始的10%降低至5.98%,表明其毒性相对较低且随时间有显著降低,反映出较好的生物降解性。这些发现不仅为深井作业中固井液配方优化提供了重要指导,而且对于提高深井作业的安全性和效率具有显著意义。The rheological properties,stability,compressive strength and environmental protection property of low-density cementing fluids under the conditions of high-temperature and high-pressure are comprehensively evaluated.The experimental results show that when the density of cementing fluid increases from 1.0 g·cm^(-3) to 1.6 g·cm^(-3),the plastic viscosity at room temperature increases significantly from 10.4 mPa·s to 27.9 mPa·s,while at 80℃ and at 120℃,the plastic viscosity increases to 42.0 mPa·s and 56.1 mPa·s respectively,which indicates that the enhancement of intermolecular friction is caused by the increase in density and temperature.When the plastic viscosity of cementing fluid increases from 10.0 mPa·s to 40.0 mPa·s,the rock carrying index correspondingly increases from 2.0 to 6.0.In addition,the thickening time of cementing fluid tested under the conditions of 135℃and 85 MPa shows that the transition time(30 to 100 Bc)is less than 30 min,highlighting its excellent anti-channeling performance.The acute toxicity of low-density cementing fluid to aquatic organisms decreases from the initial 10%to 5.98%during the 150-day experimental period,indicating that its toxicity is relatively low and decreases significantly over time,reflecting better biodegradability.These findings not only provide important guidance for the optimization of cementing fluid formulas in deep well operations,but also have an outstanding significance for improving the safety and efficiency of deep well operations.

关 键 词：固井液 低密度 深井作业 稠化性能 防窜性能 

分 类 号：TE256[石油与天然气工程—油气井工程]