利用干扰试井判断特低孔渗裂缝-孔隙型砂砾岩油藏连通性——以准噶尔盆地红153井区为例
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摘要
砂砾岩油藏储层变化快、非均质性强,油藏连通性的判断一直是国内外研究的难点。红153井区块二叠系夏子街组油藏属于特低孔渗的裂缝-孔隙双重介质油藏,且纵向上隔夹层不发育,油层跨度平均347m。为了判断油藏平面上及纵向上连通性,以寻求合理的开发方式及井距,在该区进行了干扰试井。利用红153井的开井和关井以及新投产井的压裂作为激动信号,在相邻生产井下入高精度存储式压力计,通过测得的井底连续流压的变化情况,来判断各井之间的连通性。此次打破常规将干扰试井应用于砂砾岩油藏开发中,取得了较好的效果。观测结果证实当激动井进行关井作业或者压裂时,监测井的地层压力明显上升;当激动井开井时,监测井的地层压力明显下降。其中平面上最远监测距离达1.5km,纵向上最大监测跨度达176m,大大超过一般的测试井距500m,也用实际数据证明了该特低孔渗油藏在平面上及纵向上连通性好,为油藏的开发部署提供了有利依据,表明该油藏适宜采用较大生产井距、一套井网进行开发。
The reservoirs in glutenite oil reservoirs are characterized by rapid changes and severe heterogeneity.Judgment of reservoir connectivity has always been a difficulty at home and abroad.The Permian Xiazijie Formation reservoir in the area of Well Hong153 is the one with extra-low porosity and permeability fracture-pore double-medium.The interlayers don′t develop in the vertical and average span between oil layers was 347m.Interference well test was carried out in this area for knowing the reservoir connectivity and seeking reasonable development way and well spacing.Using the opening and closing of Well Hong153 and fracturing of the new producers as an activation signal,a high-precision memory manometer was applied to the adjacent production well,and the connectivity among wells was judged by the measured continuous bottomhole pressure.The interference well test was applied to the development of glutenite reservoirs achieving good results,which broke the conventional practice.The observations confirmed that the formation pressure of the monitoring wells increase significantly when the active well is activated for well closure or fracturing and decrease significantly when the active well is opened.The farthest observation distance is as much as 1.5 km on the plane,and maximum observation span is up to 176m in the vertical,which greatly exceeds the average measuring distance of 500m.Actual data proved the good connectivity in this extra-low porosity and permeability reservoir,which provides favorable foundation for the development and deployment of the oilfield.This oil reservoir may be developed with larger well spacing and one set of well pattern.
The reservoirs in glutenite oil reservoirs are characterized by rapid changes and severe heterogeneity.Judgment of reservoir connectivity has always been a difficulty at home and abroad.The Permian Xiazijie Formation reservoir in the area of Well Hong153 is the one with extra-low porosity and permeability fracture-pore double-medium.The interlayers don′t develop in the vertical and average span between oil layers was 347m.Interference well test was carried out in this area for knowing the reservoir connectivity and seeking reasonable development way and well spacing.Using the opening and closing of Well Hong153 and fracturing of the new producers as an activation signal,a high-precision memory manometer was applied to the adjacent production well,and the connectivity among wells was judged by the measured continuous bottomhole pressure.The interference well test was applied to the development of glutenite reservoirs achieving good results,which broke the conventional practice.The observations confirmed that the formation pressure of the monitoring wells increase significantly when the active well is activated for well closure or fracturing and decrease significantly when the active well is opened.The farthest observation distance is as much as 1.5 km on the plane,and maximum observation span is up to 176m in the vertical,which greatly exceeds the average measuring distance of 500m.Actual data proved the good connectivity in this extra-low porosity and permeability reservoir,which provides favorable foundation for the development and deployment of the oilfield.This oil reservoir may be developed with larger well spacing and one set of well pattern.
引文
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[21]卢家亭,刘道杰,高贺存,等.构造-岩性油藏剩余油分布数值模拟模型研究[J].特种油气藏,2015,22(2):111-114,156.
[2]冯兴凯,吴俊海,刘顺祥,等.二连探区太39井低孔特低渗砂砾岩油藏压裂技术的研究与应用[J].油气井测试,2002(3):59-61+78.
[3]刘卫东,张国栋,白志峰,等.致密油藏水平井多级压裂储层改造体积评价[J].新疆石油地质,2015,36(2):199-203.
[4]崔传智,陈鸿林,郭迎春,等.特低渗砂砾岩油藏多段压裂水平井合理注水开发方式[J].现代地质,2018,32(1):198-204.
[5]杜洪凌,许江文,李峋,等.新疆油田致密砂砾岩油藏效益开发的发展与深化——地质工程一体化在玛湖地区的实践与思考[J].中国石油勘探,2018,23(2):15-26.
[6]胡复唐等.砂砾岩油藏开发模式[M].北京:石油工业出版社,1997:26-49.
[7]李联五.双河油田砂砾岩油藏[M].北京:石油工业出版社,1997:12-31.
[8]周丽梅,郭平,刘洁,等.利用示踪剂资料讨论塔河缝洞性油藏井间连通方式[J].成都理工大学学报:自然科学版,2015,42(2):212-217.
[9]李焕鹏,封晓明.笔架岭油田JL11区块油藏连通性的地球化学研究[J].石油地质与工程,2013,27(3):47-49.
[10]尹伟,林壬子,林双运.断块间油藏连通性的地球化学研究[J].西安石油学院学报:自然科学版,2002(6):21-24.
[11]阎燕.砂砾岩油藏干扰试井适用性研究[J].中国西部科技,2011,10(7):1-3.
[12]张红霞,严玉华,李江涛,等.干扰试井在江苏油田低渗油藏中的应用[J].油气井测试,2003:12(6):16~18.
[13]王永刚,杨国权.砂砾岩油藏的地球物理特征[J].石油大学学报:自然科学版,2001,25(5):16~20.
[14]王学军,魏小东,王兆峰,等.油藏动态资料在小断层地震识别及评价中的应用[J].石油地球物理勘探,2012,47(5):781-785.
[15]陈庆春.油藏开发中应用原油气相色谱指纹技术的可行性研究[J].石油天然气学报,2008(3):68-70,444.
[16]崔传智,李成玉,王秀坤,等.永1砂砾岩油藏井间干扰试井设计及连通性确定[J].辽宁工程技术大学学报:自然科学版,2016,35(2):140-144.
[17]王洪峰,李晓平,王小培,等.多井干扰试井技术在克深气田勘探开发中的应用[J].油气地质与采收率.2018,25(1):100-105.
[18]李晓平,张烈辉,刘启国.试井分析方法[M].北京:石油工业出版社.2009:161-165.
[19]汪敏中深层低渗透油藏开发技术政策界限研究[D].荆州:长江大学,2013.
[20]郭平,顾蒙,彭松,等.召10区块开发井网优化及加密调整分析[J].石油钻采工艺,2017,39(1):14-19.
[21]卢家亭,刘道杰,高贺存,等.构造-岩性油藏剩余油分布数值模拟模型研究[J].特种油气藏,2015,22(2):111-114,156.