甘谷驿油田唐80井区致密油储层敏感性实验分析
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摘要
在油气田勘探开发过程中,外来流体侵入油层而造成油气层伤害无法避免。为了了解甘谷驿油田唐80井区特低渗透油层生产期间可能产生油气层危害的潜在因素,依据长6油层的储层特征,对唐80井区延长组6储层进行了储层敏感性实验分析。结果表明,该地区的油藏具有一定的酸敏性。这主要因为长6油层中含有较多的酸敏性矿物绿泥石,遇酸能够生成有害的Fe3+、Fe2+等物质,在一定的条件下将产生沉淀而堵塞孔隙喉道,降低油层的渗透率。另外,唐80井区延长组6储层还含有弱速敏、弱水敏、弱碱敏和较弱的盐敏性特征。同时,该研究区在开发过程中应结合油田储层的敏感性,采取一定的保护措施减缓酸敏性等现象的发生:严格控制外来流体的流速和矿化度;实施压裂过程应尽量避免酸化处理,或者制定合理的酸化工艺且限制酸化规模。
In the development process of exploration in oil and gas fields,it is inevitable that foreign fluids can invade the oil formation and cause contamination to oil and gas reservoirs.In order to understand the potential factors that may cause oil and gas reservoir damage during the development of ultra-low permeability reservoir in the Tang 80 well area of Gangu Yi oilfield,the reservoir sensitivity experiment of Yanchang 6 reservoir in the Tang 80 well area was carried out according to the reservoir characteristics of the Chang 6 reservoir.The results show that the reservoir in this area has certain acid sensitivity.This is mainly because the Chang 6 reservoir contains more acid-sensitive mineral chlorite,which can produce harmful substances such as Fe3+,Fe2+.Under certain conditions,the pore throat will be blocked by harmful substances,and the permeability of the oil reservoir is reduced.In addition,the Yanchang formation 6 reservoir in Tang 80 well field also contains weak velocity sensitivity,weak water sensitivity,weak alkali sensitivity and weak salt sensitivity.Meanwhile,the research area should be combined with the sensitivity of the oilfield reservoir during the development process,and take certain protective measures to mitigate the occurrence of acid sensitivity and other phenomena:Strictly control the flow rate and salinity of the external fluid;Use acidification,or develop a reasonable acidification process and limit the acidification scale.
In the development process of exploration in oil and gas fields,it is inevitable that foreign fluids can invade the oil formation and cause contamination to oil and gas reservoirs.In order to understand the potential factors that may cause oil and gas reservoir damage during the development of ultra-low permeability reservoir in the Tang 80 well area of Gangu Yi oilfield,the reservoir sensitivity experiment of Yanchang 6 reservoir in the Tang 80 well area was carried out according to the reservoir characteristics of the Chang 6 reservoir.The results show that the reservoir in this area has certain acid sensitivity.This is mainly because the Chang 6 reservoir contains more acid-sensitive mineral chlorite,which can produce harmful substances such as Fe3+,Fe2+.Under certain conditions,the pore throat will be blocked by harmful substances,and the permeability of the oil reservoir is reduced.In addition,the Yanchang formation 6 reservoir in Tang 80 well field also contains weak velocity sensitivity,weak water sensitivity,weak alkali sensitivity and weak salt sensitivity.Meanwhile,the research area should be combined with the sensitivity of the oilfield reservoir during the development process,and take certain protective measures to mitigate the occurrence of acid sensitivity and other phenomena:Strictly control the flow rate and salinity of the external fluid;Use acidification,or develop a reasonable acidification process and limit the acidification scale.
引文
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[21]尹昕.大牛地气田砂岩储层敏感性实验研究[J].天然气工业,2005,25(8):31-34.
[2]王宝峰,许志赫,许大星,等.渤南油田低渗高温欠注井伤害机理研究[J].海洋石油,2003,23(3):49-54.
[3]赵仁宝,刘清华,吴亚红.低渗储层敏感性实验方法及评价研究[J].钻采工艺,2009,32(5):87-90.
[4]曹维政,杨清彦,石京平,等.葡西油田储层敏感性实验分析[J].大庆石油地质与开发,2002,21(2):53-55.
[5]王剑,周基贤,刘明,等.准噶尔盆地盐北地区下乌尔禾组储层敏感性形成机理及评价[J].非常规油气,2018,5(1):28-34.
[6]欧阳传湘,邓志颖,张伟.轮古7井区三叠系砂岩储层黏土矿物特征及敏感性损害研究[J].岩性油气藏,2011,23(5):111-114.
[7]贾统权.黏土矿物与油藏演化的对应关系对储层敏感性的影响[J].油气地质与采收率,2007,14(5):12-15.
[8]孟凡宁.延长气田气井清洁压裂液体系研究与应用[D].西安:西安石油大学,2015.
[9]邹才能,陶士振,白斌,等.论非常规油气与常规油气的区别和联系[J].中国石油勘探,2015,20(1):1-16.
[10] Cramer D D.Stimulating unconventional reservoirs:Lessons learned,successful practices,areas for improvement[C]//Society of Petroleum Engineers.SPE Unconv.Reserv.Conf.,Colorado:[s.n.],2008:1-19.
[11]魏磊,罗鑫林,崔海花,等.裂缝-孔洞型油藏储层敏感性评价[J].断块油气田,2009,16(6):73-75.
[12] Weaver J D,Nguyen P D,Loghry R A.Stabilizing fracture faces in water-sensitive shale formations[C]//Society of Petroleum Engineers.SPE East.Reg.Meet.Ohio:[s.n.],2011:17-19.
[13]曹江骏.鄂尔多斯盆地西峰地区长8储层黏土矿物分析及储层敏感性研究[J].石化技术,2018(2):148-149.
[14]郭庆,展转盈,宫伟超.鄂尔多斯盆地富黄探区长7油层组储层敏感性综合分析[J].西部勘探工程,2018(5):93-96.
[15]张景军,马智,崔佳,等.鄂尔多斯盆地姬塬油田长6储层敏感性研究[J].世界地质,2018,37(2):527-536.
[16] Hooshmandkoochi A,Zaferanieh M,Malekzadeh A.First application of underbalanced drilling in fractured carbonate formations of Iranian oil fields leads to operational success and cost savings[C]//Society of Petroleum Engineers.SPE Middle East Oil Gas Show Conf.Manama:[s.n.],2007:1-4.
[17]郭龙.陕北下寺湾油田储层敏感性研究[J].断块油气田,2009,13(5):46-48.
[18]朱华银,蒋德生,安来志,等.川西地区九龙山构造砾岩储层敏感性实验分析[J].天然气工业,2012,32(9):40-43.
[19]吴亚红,赵仁保,刘清华.低渗储层敏感性实验方法及评价研究[J].钻采工艺,2009,32(5):87-90.
[20]许建华,郝新武,王艳红,等.利津地区沙四段上部低孔低渗储集层敏感性特征[J].石油勘探与开发,2003,30(4):114-116.
[21]尹昕.大牛地气田砂岩储层敏感性实验研究[J].天然气工业,2005,25(8):31-34.