子长油田肖家河区长4+5、长6储层压裂特征研究
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摘要
子长油田肖家河区油藏属鄂尔多斯盆地晚三叠世延长组低渗、特低渗岩性油气藏,主要含油层系是长4+5、长6。该区油井完井后,几乎无自然产能,实施人工压裂对储层进行改造才能获得工业油流。通过压裂资料及微地震监测情况对研究区压裂特征进行分析,结果表明:研究区油藏埋深较浅,地层平均破裂压力较低(26.88～33.12 MPa);加砂强度与产液量及油层厚度之间存在一定规律,在一定的油层厚度条件下,加砂强度和产液量大致呈正相关性,而在产液量相同的情况下,随着油层厚度的增加,加砂强度逐渐变小;裂缝监测显示,本区人工裂缝方位以NE向为主,裂缝成因主要受天然裂缝和地层最大主应力共同控制。人工裂缝特征认识对油田后期注水开发研究具有重要意义。
The Xiaojiahe oil reservoir in Zichang Oilfield belongs to the low-permeability and ultra-low permeability lithologic reservoirs of the Late Triassic Yanchang Formation in the Ordos Basin.The main oil-bearing strata are C4+5 and C6.After completion of the well in the area,there is almost no natural production capacity,and the artificial fracturing is carried out to transform the reservoir to obtain the industrial oil flow.The fracturing characteristics of the study area were analyzed by fracturing data and microseismic monitoring.The results show that the reservoir depth in the study area is shallow,the average fracture pressure of the formation is low(26.88～33.12 MPa); sanding strength and liquid production There is a certain regularity between the thickness of the oil layer and the thickness of the oil layer.Under the condition of a certain oil layer thickness,the sanding strength and the liquid production amount are roughly positively correlated.However,in the case of the same liquid production amount,the sanding strength gradually increases with the increase of the thickness of the oil layer.The cracking monitoring shows that the orientation of artificial fractures in this area is dominated by NE direction,and the cause of the fracture is mainly controlled by natural cracks and the maximum principal stress of the formation.The understanding of artificial fracture characteristics is of great significance for the study of water injection development in the later stage of oil fields.
The Xiaojiahe oil reservoir in Zichang Oilfield belongs to the low-permeability and ultra-low permeability lithologic reservoirs of the Late Triassic Yanchang Formation in the Ordos Basin.The main oil-bearing strata are C4+5 and C6.After completion of the well in the area,there is almost no natural production capacity,and the artificial fracturing is carried out to transform the reservoir to obtain the industrial oil flow.The fracturing characteristics of the study area were analyzed by fracturing data and microseismic monitoring.The results show that the reservoir depth in the study area is shallow,the average fracture pressure of the formation is low(26.88～33.12 MPa); sanding strength and liquid production There is a certain regularity between the thickness of the oil layer and the thickness of the oil layer.Under the condition of a certain oil layer thickness,the sanding strength and the liquid production amount are roughly positively correlated.However,in the case of the same liquid production amount,the sanding strength gradually increases with the increase of the thickness of the oil layer.The cracking monitoring shows that the orientation of artificial fractures in this area is dominated by NE direction,and the cause of the fracture is mainly controlled by natural cracks and the maximum principal stress of the formation.The understanding of artificial fracture characteristics is of great significance for the study of water injection development in the later stage of oil fields.
引文
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[3]达引朋,陆红军,杨博丽,等.低渗透老油田新型多缝重复压裂技术研究与应用[J].石油钻探技术,2015(3):65-70.
[4]谢新秋,邹鸿江,武龙,等.暂堵压裂在低渗透油田的研究与应用[J].钻采工艺,2017,40(3):65-67.
[5]孙鑫,杜明勇,韩彬彬,等.二氧化碳压裂技术研究综述[J].油田化学,2017,34(2):374-380.
[6]徐林静,张士诚,马新仿.胍胶压裂液对储集层渗透率的伤害特征[J].新疆石油地质,2016,37(4):456-459.
[7]赖小娟,宫米娜,崔争攀,等.低渗透油气储层压裂液的研究进展[J].精细石油化工,2015,32(4):77-80.
[8]赵楠,高志军.控水增油支撑剂在致密低渗油田的应用[J].长江大学学报(自科版),2015(31):44-46.
[9]樊建明,屈雪峰,王冲,等.鄂尔多斯盆地致密储集层天然裂缝分布特征及有效裂缝预测新方法[J].石油勘探与开发,2016,43(5):740-748.
[10]姜琳,王清晨,郭玉森,等.鄂尔多斯盆地中生代地层天然裂缝发育特征与构造应力场演化[J].地质科学,2016,51(3):706-731.
[11]万晓龙,高春宁,王永康,等.人工裂缝与天然裂缝耦合关系及其开发意义[J].地质力学学报,2009,15(3):245-252.