煤层气井水力压裂段塞技术多因素风险分析  

Multi-factor Risk Analysis of Hydraulic Fracturing Slug Technology in Coal-bed Gas Well

作　　者：袁征[1] 黄杰[1] 郭布民[1] 孔鹏[2] 邢云龙[1] 王绪性[1] 周彪[1] 

机构地区：[1]中海油田服务股份有限公司油田生产事业部,天津300450 [2]中联煤层气有限责任公司晋城分公司,山西晋城048000

出　　处：《煤矿安全》2016年第10期157-160,共4页Safety in Coal Mines

基　　金：中海油田服务股份有限公司科研基金重点资助项目(YSB12YF008)

摘　　要：基于大量现场作业和水力压裂裂缝扩展理论,提出了煤层气井水力压裂施工中支撑剂段塞存在引起早期砂堵的风险。针对煤层气井压裂施工,着重分析了施工液量、排量、裂缝转向、多裂缝等对裂缝几何尺寸的影响。采用理论分析结合模拟计算的研究方法,阐述了上述多种因素对裂缝几何尺寸、压裂液效率、尤其是缝宽的影响规律。针对不同因素的影响,提出了相对应的施工措施:提高排量、增加段塞前泵注液量有利于支撑剂进入裂缝;提高液体黏度、排量,沿最大主应力方向定向射孔等措施降低裂缝转向带来的砂堵风险;采用细砂或粉砂作为段塞支撑剂,有利于进入人工裂缝、降低滤失量、提高施工压裂液效率,进而降低多裂缝带来的影响。Based on a large quantity of field work and extended theory of hydraulic fracturing,a problem that proppant slug could cause early sand plug during hydraulic fracturing work of coal-bed gas well is proposed. The effect on crack geometry was analyzed during coal-bed gas well hydraulic fracturing from fluid volume,pump rate,fracture turning,multi-fracture. The influence was elaborated by combining theory with numerical simulation,including the impact of the factors on fracture＇s geometry,fluid efficiency,especially fracture width. Corresponding construction measures were proposed for different factors. The increase of pump rate and fracturing fluid and increasing volume of injection liquid is advantageous to the proppant slug into the cracks. The measures,including increasing liquid viscosity and pumping rate,directionally perforating along maximum horizontal stress,could decrease even avoid sand plug risk caused by fracture turning. Fine sand was used as slug proppant to weaken multi-fracture＇s effect,which was benefit for laying proppant,decreasing liquid loss,increasing liquid efficiency.

关 键 词：煤层气井 水力压裂 支撑剂段塞 砂堵 裂缝宽度 

分 类 号：TE377[石油与天然气工程—油气田开发工程]