延长气田山西组深井低浓度胍胶压裂液体系的应用研究
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摘要
本文通过对延长气田深井(>3 600 m)进行储层特征研究开发了压裂液体系,所开发压裂液体系为:0.35%胍胶+0.50%起泡助排剂+0.80%防膨稳定剂+0.15%温度稳定剂+0.10%杀菌剂+0.15%Na2CO3+0.025%压裂专用螯合剂。体系中防膨率测试值为90.15%、发泡率为75.31%、表面张力为22.33 m N/m、界面张力为0.06 mN/m、助排率为93.3%,在130℃时体系仍具有较好的耐温耐剪切性能,在90℃条件下悬砂时间达到了29 min以上,与常规胍胶体系相比,悬砂时间大幅度延长,胍胶用量降低量也达到了30%以上,伤害率下降达到了49.51%。经过现场2口井的试验表明在131℃的地层温度下仍可顺利施工,施工压力平稳,加砂按设计完成,平均砂比均大于20%,与邻井相比压后返排效果、产气效果提升明显,前者达到了5%以上,后者达到1.0×104m3/d左右,在经济方面其具有较好的优势,实现了降本增效的作用,为应对当前不景气的国际油气价格现状具有重要意义。
This paper report the fracturing fluid system developed by studying the reservoir characteristics of deep well(>3 600 m). The developed fracturing fluid system was, 0.35 %guanidine gum+0.50 % foaming and clean up additive +0.80 % antiswelling agent +0.15 %temperature stability agent+0.10 % biocide+0.15 %Na2CO3+0.025 % chelating agent for fracturing. In this system, the antiswelling agent value was 90.15 %, the foaming rate was 75.31 %,the surface tension was 22.33 mN/m, the interfacial tension was 0.06 mN/m and the support rate was 93.3 %.The fracturing system has good heat resistance and shear resistance at 130 ℃and the time of suspended sand reached 29 minutes above at 90 ℃. Compared with conventional guanidine system, the developed guanidine fracturing fluid system suspension time was greatly extended, the amount of guanidine was reduced by more than 30 % and the damage rate decreased to 49.51 %. Through 2 gas wells experiments showed that the engineering construction was successful at the temperature of 131 ℃, the construction pressure was stable, the sand is completed according to the design and the average sand ratio was greater than 20 %.Compared with the adjacent gas wells, the fracturing fluid flowback effect and gas production increased obviously, the former reaching more than 5 % and the latter reaching1.0×104m3/d. The fracturing fluid system has a better advantage at the economic aspect with the current sluggish international oil and gas prices, which reducing the cost and enhance the effect on the current situation of international oil and gas price.
This paper report the fracturing fluid system developed by studying the reservoir characteristics of deep well(>3 600 m). The developed fracturing fluid system was, 0.35 %guanidine gum+0.50 % foaming and clean up additive +0.80 % antiswelling agent +0.15 %temperature stability agent+0.10 % biocide+0.15 %Na2CO3+0.025 % chelating agent for fracturing. In this system, the antiswelling agent value was 90.15 %, the foaming rate was 75.31 %,the surface tension was 22.33 mN/m, the interfacial tension was 0.06 mN/m and the support rate was 93.3 %.The fracturing system has good heat resistance and shear resistance at 130 ℃and the time of suspended sand reached 29 minutes above at 90 ℃. Compared with conventional guanidine system, the developed guanidine fracturing fluid system suspension time was greatly extended, the amount of guanidine was reduced by more than 30 % and the damage rate decreased to 49.51 %. Through 2 gas wells experiments showed that the engineering construction was successful at the temperature of 131 ℃, the construction pressure was stable, the sand is completed according to the design and the average sand ratio was greater than 20 %.Compared with the adjacent gas wells, the fracturing fluid flowback effect and gas production increased obviously, the former reaching more than 5 % and the latter reaching1.0×104m3/d. The fracturing fluid system has a better advantage at the economic aspect with the current sluggish international oil and gas prices, which reducing the cost and enhance the effect on the current situation of international oil and gas price.
引文
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[9]李宗田,李凤霞,黄志文.水力压裂在油气田勘探开发中的关键作用[J].油气地质与采收率,2010,17(5):76-79+116.
[2]吕文雅,曾联波,刘静,王成云,朱军.致密低渗透储层裂缝研究进展[J].地质科技情报,2016,35(4):74-83.
[3]唐洪俊,刘洪,熊继有.高压深层低渗透储层改造技术的研究与应用[J].天然气工业,2005,(12):97-99+6+5.
[4]张明,谢元,仝方超,王帅,罗立锦,王福成,蒲阳峰,何伊丽,李媛,马德敏.延长气区石盒子组储层基础物性特征及压裂对策研究[J].石油化工应用,2016,35(10):93-97+105.
[5]曾东初,陈超峰,毛新军,袁峰,李雪彬.低渗储层改造低伤害压裂液体系研究[J].当代化工,2017,46(9):1841-1844.
[6]黄世财,刘通义,董樱花,林波,张雪松.低伤害压裂液在塔里木油田的应用与研究[J].钻采工艺,2014,37(3):92-94+11.
[7]谢元,崔国涛,刘鑫,李俊华,周渝.低浓度羟丙基瓜尔胶压裂液体系的研究[J].石油化工应用,2016,35(7):9-13.
[8]杨新新,王伟锋,姜帅,杨浩珑.抗高温高密度低伤害压裂液体系[J].断块油气田,2017,24(4):583-586.
[9]李宗田,李凤霞,黄志文.水力压裂在油气田勘探开发中的关键作用[J].油气地质与采收率,2010,17(5):76-79+116.