高密度防窜水泥浆在红北1井的应用  

Anti-channeling High Density Cement Slurry Used in Cementing Well Hongbei-1

作　　者：钟福海 费中明 高飞 孙万兴 覃毅 郑岩力 

机构地区：[1]渤海钻探第一固井分公司,河北任丘062552 [2]渤海钻探第五钻井工程分公司,河北河间062450

出　　处：《钻井液与完井液》2016年第6期91-94,共4页Drilling Fluid & Completion Fluid

基　　金：中石油渤海钻探工程有限公司重大科研项目"高温高密度水泥浆体系及混配工艺研究"(2013ZD07K)

摘　　要：红北1井是青海油田一级井控风险井,也是该油田地层压力最高的一口井。为解决该井的防窜固井难题,研制了密度为2.40 g/cm^3的高密度防窜水泥浆体系,该体系选用需水量相对较少的赤铁矿粉作为加重剂;为提高稳定性加入一种超细非晶态微粒CEA-1作填充剂,其能吸附大量自由水,并具有较高反应活性;选用一种以乳胶纤维为主料,以氯化钙、氧化钾为辅料,经混合研磨而成的防窜剂FLOK-2;优选了在高固相含量水泥浆中减阻效果良好,以羧酸为主料以亚硫酸钠为辅料聚合而成的减阻剂FS-13L。实验表明,水泥浆防窜性能SPN小于3;温度变化±5℃时,体系稠化时间变动值不超过44 min,密度变化±0.05 g/cm^3时,流性指数在0.71~0.59之间变化,稠度系数在1.06~3.14 Pa·sn之间变化,体系稳定性好,满足现场施工要求。同时研制了与钻井液相容性好的冲洗隔离液:水+320%赤铁矿粉+35%冲洗剂OCW-1L+10%CEA-1+4%隔离剂O-SP。应用效果表明,在提高浆体防窜能力的前提下,结合采取其他配套技术措施,保证了该井固井质量和施工安全。The well Hongbei-1 is a well with the frst class well control risk drilled in the Qinghai oilfeld. It is also a well with the highest formation pressure drilled in that oilfeld. A high density （2.4 g/cm3） anti-channeling cement slurry was developed to cope with the cement slurry channeling. Hematite, a weighting material that needs less water in formulating drilling fluid, was selected to weight the cement slurry. To enhance the stability of the cement slurry, an ultra-fne amorphous particles, CEA-1, was used as extender. CEA-1 has the ability to adsorb large amount of free water and has a higher reactivity. An anti-channeling agent, FLOK-2, was developed by mixing a latex fber as the primary component, with CaCl2 and K2O as the secondary components. A high performance friction reducer, FS-13L, was developed by reaction between carboxylic acid as the primary raw material, and sodium sulfte as the secondary raw material. Laboratory experiment has shown that the SPN of the cement slurry was〈3. When temperature changed by±5℃, the thickening time of the cement slurry changed by less than 44 min. When the density of the cement slurry changed by±0.05 g/cm3, the flow index of the cement slurry varied between 0.71 and 0.59, and the consistency factor varied between 1.06 mPa·sn and 3.14 mPa·sn. A flushing spacer compatible with the drilling fluid used was also developed. The composition of the spacer is：water＋320% hematite powder＋35%OCW-1L （flushing agent）＋10%CEA-1＋4%spacer agent. Field application has shown that this cement slurry had good stability and anti-channeling performance. When used in combination with assorted technical measures, the quality of the cementing job can be enhanced, and operation safety ensured.

关 键 词：高压 高密度 防窜 抗污染 水泥浆 固井 

分 类 号：TE256[石油与天然气工程—油气井工程]