昭通太阳区块浅层页岩气井出砂原因分析及防砂治理措施  

Causes and controls of sand production in shallow shale gas wells of Taiyang Block,Zhaotong Demonstration Area

作　　者：陈钊 邹清腾 贾润元 龚舒婷 葛婧楠 江铭 郭耀洪 Chen Zhao;Zou Qingteng;Jia Runyuan;Gong Shuting;Ge Jingnan;Jiang Ming;Guo Yaohong(PetroChina Zhejiang Oilfield Company,Hangzhou,Zhejiang 310063,China;CNPC Greatwall Drilling Company,Beijing 100101,China)

机构地区：[1]中国石油浙江油田公司 [2]中国石油集团长城钻探工程有限公司

出　　处：《天然气勘探与开发》2022年第3期132-138,共7页Natural Gas Exploration and Development

基　　金：中国石油天然气股份有限公司专项“水平井分段压裂体积改造重大攻关专项”(编号:2021CGCGZ008)。

摘　　要：自2019年以来,昭通页岩气示范区在太阳区块浅层开展“多簇射孔+大排量+高强度连续加砂+石英石替代陶粒+暂堵转向”为核心的压裂2.0工艺技术试验,并实现了全面推广应用,单井测试产量和EUR均得到提高,但在压后排液和生产过程中部分井出现不同程度出砂,这不仅对地面管汇流程造成一定损害,还导致单井产量下降。为深究浅层页岩气井出砂原因,从太阳区块页岩储层物性特征、压裂工艺、压裂液体系、返排参数控制等方面进行综合分析,结果表明低闭合应力和压裂后不合理的返排制度是造成浅层页岩气井地层出砂的主因,高产水量和体积压裂工艺是诱因。结论认为采用优化泵注程序及纤维防砂的工艺、制定合理的返排测试及生产制度等方式可以实现防止和控制地层出砂。Since 2019,the fracturing 2.0 technology of"multi-cluster perforation+large displacement+high-intensity continuous sand adding+quartz+temporary plugging and diversion"has been tested and popularized in the shallow gas wells of Taiyang Block of Zhaotong Shale Gas Demonstration Area.As a result,both single well production during test and EUR have been enhanced.However,various degrees of sand production occurred in some wells in the process of post-frac flowback and gas recovery led to not only the surface manifold damage,but also the decrease of single well production.To find out the causes of sand production,the physical properties of shale reservoir,fracturing process,fracturing fluid system and flowback parameter control were analyzed for Taiyang Block.The results show that the main causes include the low closure stress and unreasonable flowback system,in addition,high water production and volume fracturing process are the incentives.It is concluded that the sand production can be prevented and controlled by optimizing pumping procedure,implementing fiber-based sand control,and establishing reasonable flowback test and production systems.

关 键 词：浅层页岩气 体积压裂 出砂 闭合应力 生产压差 昭通太阳区块 

分 类 号：TE375[石油与天然气工程—油气田开发工程]