低渗气藏低伤害压裂液技术研究与应用

RESEARCH AND APPLICATION OF LOW-DAMAGE FRACTURING FLUID FOR GAS RESERVOIR WITH LOW PERMEABILITY

根据中原油田文 2 3和户部寨气田储层低渗、低压、中高温等特点 ,研究了适应该储层的低伤害HB - 99有机硼交联压裂液和预前置液。通过对HB - 99有机硼压裂液的延缓交联、自动破胶、热剪切稳定性、剪切后黏度恢复、表面活性、滤失、残渣含量以及对岩心伤害等性能评价 ,证明该压裂液延缓交联能力强 ,剪切后黏度恢复率高 ,滤失低 ,破胶水化彻底 ,残渣含量低 ,表面活性高 ,能防止黏土膨胀 ,对地层损害小。现场 10井次试验表明 ,应用低伤害HB - 99有机硼交联压裂液 ,施工成功率为 10 0 % ,平均日增天然气 2 8.3× 10 4m3 ,增产效果显著。

Wen23 and Hubuzai gas reservoirs are reservoir of lower permeability,lower pressure and mid-higher temperature. To solve operating problem of these reservoirs in fracturing teatmend, HB-99 organic boron crosslinking fracture fluid and prepad with lower damage have been developed. Delayed crosslinking,self-breaking,thermal shear stability,viscosity recovering effect after shearing,surface activity,filtration,residue value and core damage have been tested in lab. Results of lab testing show that crosslinking time is longer at ordinary temperature, fracturing fluid can be fully breaking without gel breaker,fracturing fluid has high recovery viscosity,low filtration rate. Results of 10 well tests show operating success radio of HB-99 organic boron crosslinking fracture fluid is 100%, average gas increment is 28.3×10 4 m 3/d and cumulative gas increment of nine months reaches to 3310.5×10 4 m 3.