胍胶压裂液伤害性研究

The Damage of Guar Gum Fracturing Fluid

水力压裂过程中,压裂液的伤害影响着压裂改造的效果。胍胶破胶液中的水不溶物、残渣等固相颗粒不会侵入低渗地层,胍胶对地层的伤害可逆,可通过返排过程渐渐恢复至90%。胍胶对支撑剂导流层的伤害随浓度增加而增加,且几乎不可逆;关键是施工过程中就要降低伤害。对羟丙基胍胶与羧甲基羟丙基胍胶系列配方,以及不同浓度的配方分别对支撑剂导流层伤害分析,胍胶使用量越大、浓度越高、残渣越高对导流能力的伤害越大。在F4区块现场应用证明,降低胍胶压裂液的伤害可大幅提高产能。

In hydraulic fracturing,the damage of fracturing fluid affects the fracturing treatment effect.Water insoluble matter and residue in breaking fluid will not invade the low-permeability formation.The damage can reverse to 90% by flowback.The damage to proppant conductivity is irreversible and increases with the higher guar concentration.So the key is to reduce the damage in fracturing.Different concentrations of hydroxypropyl guar（HPG） and carboxymethyl hydroxypropyl guar（CMHPG） are used to damage the proppant conductivity.The higher concentration and the more residue will produce more damage.Field application in F4 shows that to reduce guar gum fracturing fluid damage can significantly increase productivity.