煤储层压裂轻质陶粒支撑剂粒级配比优化  

Optimization on particle size fraction of lightweight coated ceramsite proppant in coal reservoir

作　　者：常晓亮 吕闰生[2] 王鹏 李冰 高琳 CHANG Xiaoliang;LYU Runsheng;WANG Peng;LI Bing;GAO Lin(Yongcheng Coal&Electricity(Group)Co.Ltd.,Yongcheng 476600,China;School of Resources&Environment,Henan Polytechnic University,Jiaozuo 454003,China;School of Resources&Environment,Henan University of Engineering,Zhengzhou 451191,China)

机构地区：[1]永煤煤电(集团)股份有限公司,河南永城476600 [2]河南理工大学资源环境学院,河南焦作454003 [3]河南工程学院资源与环境学院,河南郑州451191

出　　处：《煤田地质与勘探》2021年第2期28-33,共6页Coal Geology & Exploration

基　　金：国家自然科学基金项目(41872169)。

摘　　要：水力压裂是目前煤储层改造增透的主要技术措施之一,支撑剂在压裂裂缝中的铺置范围和输送距离是衡量水力压裂效果的重要指标。针对潞安矿区煤储层特点,采用物理实验和数值模拟方法,对比分析试验煤层气井压裂支撑剂导流能力、铺砂范围、粒径组合等因素对裂缝导流能力的影响,筛选出最优的支撑剂粒径和粒级配比。结果表明,随着闭合压力增大,不同粒径覆膜轻质陶粒支撑剂对裂缝导流能力降低;相同粒径覆膜轻质陶粒在裂缝中形成的砂堤和铺砂区长度是传统石英砂的2倍左右;40~60目(0.25~0.38 mm)、16~40目(0.38~1.00 mm)、12~20目(0.83~1.40 mm)3种粒级覆膜轻质陶粒中,12~20目压裂裂缝长度、支撑缝长和平均支撑剂浓度最小,而导流能力最高;当3种粒级40~60目、16~40目、12~20目配比为1∶6∶2时,覆膜轻质陶粒压裂效果最好,平均裂缝缝长320 m,裂缝宽度0.672 cm,支撑剂密度5.16 kg/m2,裂缝导流能力为1.263。潞安矿区煤层气井采用覆膜轻质陶粒支撑剂压裂时,通过优化支撑剂粒度配比,显著提高裂缝导流能力,以提高煤储层渗透性和煤层气开采效果。Hydraulic fracturing is currently one of the main technical measures for enhancing coal reservoirs permeability.The spreading range and transportation distance of proppants in the fracture is an important indicator of hydraulic fracturing to evaluate fracturing effect.According to the characteristics of coal reservoirs in Lu’an mining area,physical experiments and numerical simulation methods are used to compare and analyze the effects of fracture conductivity,sand spreading range,particle size combination and other factors on conductivity of coalbed methane wells,and the best proppants particle size and particle size ratio are selected.The research results indicate that the fracture conductivity of proppants decrease with the increasing closure pressure.The length of the coated light ceramsite proppants in the cracks of the sand embankment and sand paving area is nearly twice that of ordinary quartz sand.Among the three sizes of 40-60 mesh,16-40 mesh,and 12-20 mesh coated lightweight ceramsite,the 12-20 mesh fracturing fracture length,supporting fracture length and average proppants concentration are the smallest,while the conductivity is the highest;when ratio of particle size for 40-60:16-40:12-20=1:6:2,the best fracturing range was obtained by using coated lightweight ceramsite with an average fracture length of 320 m,fracture width of 0.672 cm,proppants concentration of 5.16 kg/m2 and fracture conductivity of 1.263.

关 键 词：水力压裂 支撑剂 粒级配比 覆膜轻质陶粒 导流能力 

分 类 号：TE377[石油与天然气工程—油气田开发工程]