煤矿安全2024，Vol.55Issue(1)：72-77,6.DOI:10.13347/j.cnki.mkaq.20221502
煤层气井压裂用新型煤粉分散剂研究
Study on new pulverized coal dispersant for fracturing of coalbed gas wells
摘要
Abstract
A large amount of pulverized coal is easy to be produced in the process of hydraulic fracturing of coalbed methane reser-voir.The accumulation and settlement of pulverized coal will cause serious blockage to the fractures formed by fracturing,and re-duce the permeability and conductivity of fractures and affect the effect of fracturing stimulation of coalbed methane wells.There-fore,a new type of coal powder dispersant MFFS-2 was developed through a large number of laboratory experiments and combined with the reservoir characteristics of the target CBM block,and its comprehensive performance was evaluated.The experimental res-ults show that when the mass concentration of MFFS-2 reaches 0.3%,the surface tension of water solution can be reduced to less than 25 mN/m,and the contact angle of coal surface can be reduced from 115.3° to less than 60° with good surface activity and wet-tability;when the suspension of coal powder is standing for 10 hours,the suspension rate of coal powder can reach more than 30%with the addition of 0.3%MFFS-2.When 0.3%MFFS-2 solution is used to displace for 2 hours,the yield of pulverized coal can reach more than 60%,which indicates that MFFS-2 has good suspension dispersion and carrying effect on pulverized coal;in addi-tion,the damage rate of MFFS-2 to the matrix permeability of block coal core in the target area is less than 10%,and the damage de-gree of fracturing fluid system to the permeability of coal core is reduced after adding MFFS-2 into the active hydraulic fracturing fluid.The field fracturing operation results of coalbed methane well show that the fracturing operation of S-1 well is smooth after adding new coal powder dispersant MFFS-2,a large amount of coal powder is carried out in the backflow fluid,and the gas produc-tion is high,which achieves the expected fracturing effect.Moreover,the construction effect of the new active hydraulic fracturing fluid in the same block is significantly better than that of the conventional active hydraulic fracturing fluid.关键词
煤层气井/水力压裂/煤粉/分散剂/活性水压裂液Key words
coalbed methane well/hydraulic fracturing/coal powder/dispersant/active hydraulic fracturing fluid分类
矿业与冶金引用本文复制引用
孟照峰..煤层气井压裂用新型煤粉分散剂研究[J].煤矿安全,2024,55(1):72-77,6.基金项目
"十三五"国家油气重大专项资助项目(2016ZX05046-006) （2016ZX05046-006）
