SN井区抗高温液硅-胶乳防气窜水泥浆  

HTHP Anti-channeling Liquid Silica Latex Cement Slurry Used in Block SN

作　　者：陈超[1] 王龙[1] 李鹏飞 杨忠祖 王伟志[1] 

机构地区：[1]中国石化西北油田分公司石油工程监督中心,乌鲁木齐830011 [2]德州大陆架石油工程技术有限公司,山东德州253034 [3]渤海钻探工程技术研究院,天津300457

出　　处：《钻井液与完井液》2016年第5期88-91,共4页Drilling Fluid & Completion Fluid

基　　金：中石化科研项目"顺南高压气井安全钻井配套技术研究"(P14013)

摘　　要：SN井区井底静止温度高,气层非常活跃,压稳与防漏难度大,单纯胶乳防气窜水泥浆体系应用效果不理想。液硅乳液作为纳米级防气窜剂,活性SiO_2颗粒可参与水泥水化反应,具有增强水泥石强度、降低水泥石弹性模量和渗透率作用。在优化硅粉加量和粗细硅粉复配的基础上,研制出抗高温液硅-胶乳防气窜水泥浆,其具有API失水量小于50 mL、直角稠化、SPN值小于1、防气窜效果好、沉降稳定性好等特点;SEM和XRD分析显示,水泥石致密性好,水化产物中无Ca(OH)_2,而具有较多的雪钙硅石和硬钙硅石,高温下水泥石表现出良好的强度稳定性。液硅-胶乳防气窜水泥浆在SN井区进行了入井应用,实现了对高压气层的有效封固,取得了良好的效果。Wells drilled in the Block SN have high bottom hole temperature under static conditions, and the gas zones are very active.Prevention of well kick and lost circulation during drilling is quite difficult. Latex anti-channeling cement slurry alone has been used in the past in well cementing, but it didn＇t work well. Liquid silica latex, as a nanometer anti-channeling agent, has active SiO_2 that will take part in the hydration reaction of cement. It thus helps increase the strength, reduce the elastic modulus and permeability of set cement. By optimizing the amount of silica used and the ratio of coarse particle over fine particle silica, a high temperature antichanneling liquid silica latex cement slurry was developed. This cement slurry had filter loss less than 50 mL, a right-angle thickening curve, an SPN less than 1, good anti-channeling performance and settling stability. SEM and XRD analyses demonstrated that a dense set cement can be acquired. Tobermorite and xonotlite, instead of Ca（OH）_2, were found in the hydrated cement, and this results in a stable strength of the set cement at elevated temperature. High pressure gas zones in wells drilled in Block SN have been effectively cemented with this anti-channeling liquid silica latex cement slurry.

关 键 词：气井 固井 防气窜胶乳水泥浆 液硅 耐高温 

分 类 号：TE256.6[石油与天然气工程—油气井工程]