无氯低温早强剂及其在浅层水平井固井中的应用.pdf

第43卷第4期
探矿工程(岩土钻掘工程
2016年4月
s Esploration Engineering (Rock &Soil Drilling and funneling
Apr.2016:55-58
无氯低温早强剂及其在浅层水平井固井中的应用
于小龙,王涛,刘云2,李伟峰
(1,映西延长石油く集团〉有限責任公司研究院,映西西安710075;2.延长油田股份有限公司勘探开发技术研究中
心,陕西延安716000
摘要:基于水平井在低渗油藏开发方面的巨大优势,采用水平井已成为开发延长油田东部浅层油疲稳产增产的
项重要技术。由于该区域水平井具有井内温度低、垂深浅、后期压裂易产生水平缝等特点,要求水泥环有高的强度
和密封性。通过室内试验筛选出一种新型的无氯复合型早强剂M59S,与水泥中的铁离子、铝离子形成促凝早强的
复合络合物,可大幅缩短低温下水泥水化时间,提高水泥石早期强度,辅之以其他外加剂形成了一套低温早强水泥
浆体系。经室内性能评价,该体系稠化过渡时间短,浆体稳定性好,析水为0,失水量<40mL/30min,流变性能良
好,20℃常压养护水泥石48b抗压强度>20MPa,能够满足低温浅层水平井固井的施工及技术要求。该低温早强
水泥浆体系在延长东部浅层水平井中应用,固井效果良好。
关键词:低温;早强剂;水泥浆;浅层水平井:固井
中图分类号:TE256文献标识码:A文章编号:1672-7428(2016)04-0055-04
Chloride-free and ow Temperature Early Strength Agent and the Application in Cementing of Shallow Horizont
Well/YU Xiao-long WANG Tao, LIU Yu, L Wei feng(1. Research Institute of Yanchang Petroleumgroup>Co. Ltd
Xi an Shaanxi 710075, China; 2. Oil Exploration and Development Technology Research Center of Yanchang Petroleum
Yan'an Shaanxi 716000 Chi
Abstract: Based on the great advantages in low permeability reservoir development, horizontal well has been an important
part of the development of shallow reservoir in Yanchang oilfield. For the characteristics of low temperature, shallow vertical
depth and the horizontal seams creating in post racture in this region, high strength and good sealing are required for the
cement sheath. Through laboratory tests, a new type of chlorine-free composite M59S was selected, which was put with iron
ion and aluminum ion in cement to form an early strength complex to greatly shorten the cement hydration time at low tempera-
tures and improve the early strength of cement stone. A set of low temperature early strength slurry system is formed assisting
itives. By the laboratory performance evaluation, this slurry system has a short thickening transition time, good
stability and Theological characteristic, zero water precipitation and water loss less than 40ml. The compressive strength of
cement stone reached more than 20 MPA with ordinary pressure curing in the condition of 20C for 48h. The construction re-
quirements of low temperature horizontal well cementation were satisfied. This low temperature early strength slurry system
has good cementing effects in its application for shallow horizontal wells in the eastern part of Yanchang oilfield
Key words low temperature; early strength agent; slurry; shallow horizontal well well cementation
鄂尔多斯盆地延长油田东部储层埋深浅、物性压裂产生水平缝?,固井的水泥与传统的、适用于
差、自然产能低,为较难动用的致密砂岩油藏。采用浅层固井的水泥浆主要以缩短候凝时间进行设计相
常规直井压裂效果差,往往达不到经济有效地开发比,其特殊性在于:要求水泥浆具有极好的稳定性,
要求口-2。基于水平井在低渗油藏开发方面的巨大防止滤液污染储层,形成高边水带,成为油气水窜的
优势,成为开发延长东部浅层油藏稳产、增产的一项通道;要求水泥浆早期强度发展快、后期强度高,且
重要技术。由于地层温度较低,油井水泥浆水化水泥环密封性好。为此,针对低温早强水泥浆体系
速度慢、早期强度低、候凝时间长,增加了建井周期,开展研究,并将其应用于延长东部浅层大位移水平
提高了建井成本,同时还易造成环空窜流,影响固井井的固井工程中,成为一个突出的重要技术难题。
质量和作业安全+?。同时该区域垂深较浅,后期
收稿日期:2015-09-24;修回日期:2015-12-28
基金项目:延长油田公司项目“延长东部浅层油藏水平井开发技术研究与应用一固井技术”(编号:ycsy2014xjs-B-2-9)
作者简介:于小龙,男,汉族,1977年生,高级工程师,硕士,从事钻完井工艺技术的研究及管理工作,陕西省西安市科技二路75号,
595385177@99com
通讯作者:王涛,男,汉族,1986年生,工程师,硕士,从事水泥浆体系及固井工艺研究,陕西省西安市科技二路75号,wt861104@126.com