大庆油田扶杨油层体积压裂技术研究
发布时间：2018-12-16 19:07
【摘要】：扶杨油层是大庆外围油田主要后备石油产量接替地区,属于低—特低渗透、以岩性为主的复合型油藏,自然产能低。近几年,改造方面针对扶杨储层特点,形成了以CO2泡沫压裂技术、清洁压裂液技术、低伤害水基压裂液体系低伤害压裂增产工艺,解决了部分扶杨油层进一步提高单井产能的技术难题,但存在压裂成本较高的问题,难以在开发上推广。扶杨油层的剩余储量大体分布在大庆长垣、龙西-巴彦查干、齐家北、肇源—裕民以及提交储量的周边地区及分散区块。扶杨油层含油产状逐年变差:储层孔隙度一般10-15%,渗透率高的几个毫达西、低的还不到0.05×10-3μm2,泥质含量一般8-15%,有的在20%以上;原油物性相对较差(密度0.86-0.87、凝固点33-35℃),自然产能低,压前经提捞、气举和MFE等测试,日产油仅几公升到几百公升。总的来看,按储层渗透率和原油流度,扶杨油层未动用储量分为四类,多分布在Ⅱ、Ⅲ类储层。在开发改造方面,开展了多个区块的水驱试验,从反九点井网到矩形井网,井排距从300m缩小到60m。试验表明,矩形井网300m×300m无法建立驱替关系;300m×60m井距在部分区块能建立驱替关系,但效果不好,采出程度低。对于水平井常规分段压裂改造工艺,主要优化了段数与改造规模两者的关系,在造人工裂缝工艺上沿用直井改造方式,单缝的供油能力实际没有得到提高,压后产能效果完全依赖改造段数,改造效果也往往达不到水平井预期的增产效果。本文建立了流线模拟分析方法,对于平面选井及纵向选层具有很好的指导性,为工艺措施优化提供了有力的技术支持。现场试验按同一卡段最小渗透率40md以下的层,采用对应压裂;40md以上的层单压水井,可以调整注采剖面,完善注采关系。通过模拟分析,确定了不同物性储层在同一卡段合注的非均质性界限值,为卡段均衡注水提供了理论依据。
[Abstract]:Fuyang reservoir is the main reserve oil production replacement area in Daqing peripheral oil field, which belongs to the compound reservoir with low-very low permeability and lithology, and its natural productivity is low. In recent years, according to the characteristics of Fuyang reservoir, in the aspect of revamping, CO2 foam fracturing technology, clean fracturing fluid technology, low damage water base fracturing fluid system, low damage fracturing and increasing production technology have been formed. The technical problem of further improving single well productivity in some Fuyang reservoirs is solved, but the problem of high fracturing cost is difficult to be popularized in development. The remaining reserves of Fuyang oil reservoir are mainly distributed in Daqing Placanticline, Longxi-Bayan Chagan, Qijiabei, Zhaoyuan-Yumin and the surrounding areas and scattered blocks of submitted reserves. The oil-bearing occurrence of Fuyang reservoir has become worse year by year: the porosity of reservoir is 10-15, the permeability is several mordaci, the low is less than 0.05 脳 10-3 渭 m ~ (2), and the muddy content is 8-15%, some is above 20%; The physical properties of crude oil are relatively poor (density 0.86-0.87, freezing point 33-35 鈩，
本文编号：2382896
[Abstract]:Fuyang reservoir is the main reserve oil production replacement area in Daqing peripheral oil field, which belongs to the compound reservoir with low-very low permeability and lithology, and its natural productivity is low. In recent years, according to the characteristics of Fuyang reservoir, in the aspect of revamping, CO2 foam fracturing technology, clean fracturing fluid technology, low damage water base fracturing fluid system, low damage fracturing and increasing production technology have been formed. The technical problem of further improving single well productivity in some Fuyang reservoirs is solved, but the problem of high fracturing cost is difficult to be popularized in development. The remaining reserves of Fuyang oil reservoir are mainly distributed in Daqing Placanticline, Longxi-Bayan Chagan, Qijiabei, Zhaoyuan-Yumin and the surrounding areas and scattered blocks of submitted reserves. The oil-bearing occurrence of Fuyang reservoir has become worse year by year: the porosity of reservoir is 10-15, the permeability is several mordaci, the low is less than 0.05 脳 10-3 渭 m ~ (2), and the muddy content is 8-15%, some is above 20%; The physical properties of crude oil are relatively poor (density 0.86-0.87, freezing point 33-35 鈩，
本文编号：2382896
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