新型防窜韧性高密度水泥浆体系性能研究  

Study on the performance of a new type of anti-channeling toughness high-density cement slurry system

作　　者：曹灿[1] CAO Can(Shanghai Operations Company,Oilfield Chemistry Division,CNOOC Oilfield Services Co.,Ltd.,Shanghai 200030,China)

机构地区：[1]中海油田服务股份有限公司油田化学事业部上海作业公司,上海200030

出　　处：《能源化工》2023年第6期51-54,共4页Energy Chemical Industry

基　　金：油气藏地质及开发工程国家重点实验室(西南石油大学),深层页岩气井固井水泥环完整性失效机理与预防机制研究(PLN2021-16)。

摘　　要：针对深水固井作业中环空带压的防窜问题,室内优选了杜拉纤维与0.5%胶乳的胶乳复配使用,改善水泥浆的微观结构,提高水泥浆的韧性。研发了纳米防窜剂NT-C并协同JZ-6S复合加重剂调节水泥浆的密度,开发了一种新型防窜韧性高密度水泥浆体系。结果表明,该体系密度可调,水泥浆(2.4 g/cm^(3))抗压强度大于25 MPa,抗冲击功达到3.54 kJ/m^(2),渗透率为0.008×10-3μm^(2),弹性模量小于7 GPa,具有较好的弹韧性,可有效提高抵抗冲击的能力;该水泥浆体系抗窜强度大于8MPa/m^(2),线性膨胀率达-0.05%,具有较好的密封性和防窜能力,确保了深水固井水泥环的完整性,为油气井的安全提供技术支撑。In response to the anti-channeling problem of annular pressure in deepwater cementing operations,a combination of Dura fiber and 0.5%latex is selected indoors to improve the microstructure of cement slurry and enhance the toughness of cement slurry.The nano anti-channeling agent NT-C is developed,which is collaborated with JZ-6S composite weighting agent to adjust the density of cement slurry,then a new anti-channeling toughness high-density cement slurry system is developed.The results show that the density of the system is adjustable,the compressive strength of the cement slurry(2.4 g/cm^(3))is greater than 25 MPa,the impact resistance energy reaches 3.54 kJ/m^(2),the permeability is 0.008×10-3μm^(2),the elastic modulus is less than 7 GPa.The system has good elasticity and toughness,which can effectively improve the ability to resist external water impacts.In addition,the anti-channeling strength of the cement slurry system is greater than 8 MPa/m^(2),the linear expansion rate reaches-0.05%.It has good sealing and anti-channeling ability,which can ensure the integrity of the cement sheath in deepwater cementing and provide technical support for the safety of oil and gas wells.

关 键 词：深水 防窜 固井 纳米防窜剂 

分 类 号：TE256.7[石油与天然气工程—油气井工程]