The present invention relates to a method of temporary plugging and turning fracturing by using differential pressure polymer temporary plugging agent. Firstly, the types of temporary plugging and turning agents are determined according to the formation pressure coefficient, reservoir temperature, pressure and depth of the target well reservoir; secondly, the dosage of temporary plugging agents is designed according to the number of channels; on the basis of fractured fracture, the powder differential pressure polymer temporary plugging agent and particle temporary plugging agent are added to sliding water. In guanidine gum-based fluid, temporary plugging fluid is replaced by sliding water or guanidine gum-based fluid, during which oil pressure changes are observed and recorded, and the effect of temporary plugging to fracturing can be judged by analyzing the horizon and direction of new fracture development by analyzing the fracturing fracture monitoring map. The invention effectively plugs the original fracture by using pressure differential polymer powder temporary plugging agent and particle temporary plugging agent, improves the pressure bearing capacity of the fracture and increases the fracture control area, at the same time improves the fracture complexity through inter-cluster and intra-fracture turning, forms the volume fracturing effect of the communication between the main fracture and the natural fracture, and ultimately achieves the purpose of oil and gas well production increase.
【技术实现步骤摘要】
一种利用压差聚合暂堵剂实现暂堵转向压裂的方法
本专利技术属于油气田开发领域,涉及油气田压裂施工中暂堵转向环节,具体涉及一种利用压差聚合暂堵剂实现暂堵转向压裂的方法。
技术介绍
低孔低渗、致密油气储层的改造需要造长缝、复杂裂缝达到SRV体积改造效果,才能显著提高产能。国内外大量生产测井和井下成像数据表明,多簇射孔水平井常规压裂时簇间孔眼进液差异大,导致水平井段相当部分射孔簇没有压开,地质储量没有得到有效动用,压裂改造效果与地质预期差距大。现有技术存在的缺陷主要有:1、套管内桥塞分隔,一段多簇射孔压裂井,笼统压裂(限流压裂法)容易导致储层高品位区压裂规模过大,单簇缝长过长,造成井间干扰,而次级压裂区得不到充分改造;2、套管变形井,无法下入分段工具;3、在裸眼井有限的分段内,人造裂缝的起裂位置常受封隔器封位的控制(膨胀作用导致的应力变化点),导致裂缝在并不希望的位置起裂,实际裂缝分布往往与设计不符,严重影响增产效果;4、常规分段压裂只能动用段内物性好、应力低的高级别层段,低级别层段则难以开启;利用压差聚合暂堵剂通过暂堵转向压裂可以提高水平井段内裂缝开启程度,增加裂缝复杂 ...
【技术保护点】
1.一种利用压差聚合暂堵剂实现暂堵转向压裂的方法,其特征在于,包括以下步骤:⑴施工前准备:根据储层温度确定暂堵转向剂种类,SM型压差聚合型粉末暂堵剂和6M型颗粒暂堵剂作为主体方案;⑵设计暂堵剂加量:根据孔道数量,按当天压裂暂堵,暂堵剂总用量为3.6‑4kg/孔,隔天压裂暂堵,暂堵剂总用量为2.25‑3kg/孔暂堵剂加量;⑶配制暂堵液:在已压开裂缝的基础上,将SM型粉末压差聚合暂堵剂和6M型颗粒暂堵剂加入到滑溜水或胍胶基液中,携带液排量2‑2.5m3/min,SM型粉末压差聚合暂堵剂和6M型颗粒暂堵剂加入浓度分别为45.0‑80.0g/L和9.0‑16.0g/L;⑷顶替暂堵液 ...
【技术特征摘要】
1.一种利用压差聚合暂堵剂实现暂堵转向压裂的方法,其特征在于,包括以下步骤:⑴施工前准备:根据储层温度确定暂堵转向剂种类,SM型压差聚合型粉末暂堵剂和6M型颗粒暂堵剂作为主体方案;⑵设计暂堵剂加量:根据孔道数量,按当天压裂暂堵,暂堵剂总用量为3.6-4kg/孔,隔天压裂暂堵,暂堵剂总用量为2.25-3kg/孔暂堵剂加量;⑶配制暂堵液:在已压开裂缝的基础上,将SM型粉末压差聚合暂堵剂和6M型颗粒暂堵剂加入到滑溜水或胍胶基液中,携带液排量2-2.5m3/min,SM型粉末压差聚合暂堵剂和6M型颗粒暂堵剂加入浓度分别为45.0-80.0g/L和9.0-16.0g/L;⑷顶替暂堵液:以3.2m3-3.6m3/min的排量泵注大于一个井筒容积的滑溜水或胍胶基液将暂堵液顶替到位,期间观察并记录油压变化;⑸判断暂堵转向效果:通过暂堵全部进地层后,暂堵转向压力增幅及压裂裂缝监测图分析压力响应点的位置、新裂缝展开的层位来判断本方法是否实现了暂堵转向压裂施工。2.根据权利要求1所述的利用压差聚合暂堵剂实现暂堵转向压裂的方法,其特征在于:步骤⑴中全系列暂堵剂适用的地层应力差异大小为1.1-2.1;根据储层温度是否小于90℃来选择SM型或6M型中常规型或抗高温型暂堵剂。3.根据权利要求1所述的利用压差聚合暂堵剂实现暂堵转向压裂的方法,其特征在于:还可以选择暂堵球作为备选方案,条件是:在暂堵压裂...
【专利技术属性】
技术研发人员:邓志勇,魏三林,关海萍,唐勇,廖进,李雪雨,
申请(专利权)人:古莱特科技股份有限公司,
类型:发明
国别省市:河北,13
还没有人留言评论。发表了对其他浏览者有用的留言会获得科技券。