摘要
鄂尔多斯盆地气藏属于低孔、低渗、低压的致密砂岩气藏,在山西组、太原组、本溪组附近地层发育有多段煤、砂互层。在水力压裂过程中,地层裂缝通常在低应力面发生起裂,支撑剂大多进入煤层,较少铺置到致密砂岩层中,难以在致密砂岩层中形成有效的气体渗流通道。为此,在真三轴实验条件下,对大尺寸砂岩-煤岩产层组模型进行水力压裂实验,通过剖切压裂试样描述了在不同起裂位置、不同压裂液黏度、不同排量等条件下的水力裂缝扩展和空间展布规律,同时,结合软件模拟不同储层物性条件下对水力裂缝扩展的影响,系统评价了实现煤系致密砂岩气储层综合改造的条件。
The gas reservoirs in the Ordos Basin belong to tight sandstone gas reservoirs with low porosity, low permeability and low pressure. There are multiple coal and sand interbeds in the formations near Shanxi Formation, Taiyuan Formation and Benxi Formation. In the process of hydraulic fracturing, formation cracks usually start on the low-stress surface,and most of the proppant enter the coal seam,and is less spread in the tight sandstone layer. It is difficult to form an effective gas seepage channel in the tight sandstone layer. For this reason, under the conditions of true triaxial experiments, hydraulic fracturing experiments were carried out on the large-scale sandstone-coal production group model. The fracturing samples were cut to describe the different initiation positions, different fracturing fluid viscosities, and different law of hydraulic fracture propagation and spatial distribution under conditions such as displacement. At the same time, combined with software, the impact of different reservoir physical conditions on hydraulic fractures extension was simulated, the conditions for the comprehensive transformation of tight sandstone gas reservoirs in coal measures were systematically evaluated.
作者
杨琦
张红杰
王春鹏
梅文博
杨帆
毛峥
YANG Qi;ZHANG Hong-jie;WANG Chun-peng;MEI Wen-bo;YANG Fan;MAO Zheng(China United Coal-bed Methane Co.,Ltd.,Beijing 100011,China;College of Petroleum Engineering,Yangtze University,Wuhan 430100,China)
出处
《当代化工》
CAS
2021年第9期2176-2181,共6页
Contemporary Chemical Industry
基金
中海油有限公司七年行动计划重大科技专项,非常规天然气高效钻采关键技术(项目编号:CNOOC-KJ 135 ZDXM 40 ZL03)。
关键词
煤系地层
致密砂岩
裂缝扩展
水力压裂
穿层致裂
Coal measure strata
Tight sandstone
Hydraulic fracture extension
Hydraulic fracturing
Penetrating layer
