摘要
对低压致密、水敏性气藏,常规水基压裂开采存在水锁损害严重、压裂液返排难度大等问题,严重影响气井产量,采用CO_2泡沫压裂开采工艺是提高该类气藏产量的有效途径,为此开展了CO_2泡沫压裂技术研究,包括CO_2泡沫压裂液酸性交联技术、注入方式优化技术、变排量变泡沫质量设计方法和提高裂缝导流能力配套措施。以苏里格气田苏11-52-65井为例,采用优化的CO_2泡沫压裂技术,完成了单层加砂49.2 m^3的较大规模施工,压后破胶液实现了完全自喷快速返排,日产气量达到苏里格气田平均单井日产气量的2.2倍,证实了该优化设计方法和配套措施的有效性,也显示出CO_2泡沫压裂工艺在开采低压致密气藏中的良好应用前景。
Low pressure and water-sensitive tight gas reservoir,conventional hydraulic fracturing can easily cause water lock damage and the post-fracturing gel broken fluid was difficult to flow back,which results in production decline. Here,CO_2 foam hydraulic fracturing techniques was studied. The techniques included development of acid CO_2 foam fracturing fluids,selection of pumping string and injection scheme,optimization design of variable foam quality with variable flow rate,and supporting measures to improve the fracture conductivity. An example in No. 11-52-65 well of Sulige gas field,fracturing treatment was successfully carried out in the gas field. The proppant amount achieved up to 49. 2 m^3 for a single layer. The gel breaking liquid flow back completely without pumping. The daily gas output 2. 2 times that of the average single well production in this gas field. The results of empirical study confirmed the effectiveness of the optimization design method and the supporting measures,and it shows the good application prospect of CO_2 foam fracturing in low pressure tight gas reservoir.
出处
《河南理工大学学报（自然科学版）》
CAS
北大核心
2017年第4期14-19,共6页
Journal of Henan Polytechnic University（Natural Science）
基金
国家高技术研究发展863计划项目(2013AA064801)
关键词
低压致密气藏
CO2泡沫压裂技术
酸性缔合压裂液
low pressure water sensitive reservoir
CO2 foam fracturing techniques
acid associated fracturing fluids
