摘要
为了研究煤层气井压裂中支撑剂嵌入对裂缝导流能力的影响,应用FCES-100裂缝导流仪,针对不同类型支撑剂嵌入对煤岩裂缝导流能力的影响进行了测试.实验表明,与砂岩地层不同,煤层的硬度较小,在较小的闭合压力下压裂中支撑剂嵌入情况较严重,导致导流能力降低.10 kg/m^2铺砂浓度下,闭合压力为35 MPa时石英砂嵌入对导流能力的影响最大,此时导流能力下降36.4%,闭合压力为25 MPa时核桃壳嵌入对导流能力的影响最大,此时导流能力下降34.8%.当煤层闭合压力低于20 MPa时,应该优先选择核桃壳作为支撑剂 当煤层闭合压力高于25 MPa时,应优先选择石英砂作为支撑剂.所得出的结论对今后煤层气的研究工作及现场施工具有一定的指导意义.
In order to study impact of different proppants embedment on flow conductivity of in coalbed gas wells, this paper performs test for using FCES-100 fracture flow conducting meter, to study impact of different types of proppant embedding on fracture flow conductivity in coalbed fractures. Result indicates that hardness of coalbed is lower than sandstone, proppant embedment in fracture is more serious under low closure pressure and leads to conductivity decrease. When sand concentration is 10 kg/m^2 and closure pressure is 35 MPa, quartz sand embedment has most impact on flow conductivity and conductivity decreases by 36.4%. When closure pressure is 25 MPa, nutshell has most impact and conductivity decreases by 34.8%. Nutshell should be used as proppant when coalbed closure pressure is lower than 20 MPa. When closure pressure is more than 25 MPa, quartz sand should be chosen. The conclusions in this paper can be used to guide the future study of coalbed methane and field operation.
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2010年第5期121-124,共4页
Petroleum Geology & Oilfield Development in Daqing
基金
国家重点基础研究发展规划＂973＂项目＂中国煤层气成藏机制及经济开采基础研究＂（2002CB117009）资助.
关键词
煤层气
水力压裂
支撑剂嵌入
导流能力
coalbed methane
hydraulic fracture
proppant embedment
flow conductivity
