关键词: 低温, 低渗, 增稠剂, 压裂液, 酸性

Abstract: According to the situation which is low formation temperature and permeability，serious water and alkaline sensitivity of reservoir in shallow layer gas reservoir in the west of Sichuan，new types of thickener used under the condition of acidity is developed by leading sodium carboxymethyl and hydroxyl propyl which are hydrophilic group into normal guar gum.Usage amount of this thickener is fewer，and character of tackify is very good，sediments is little after breaking gel，all of above are very favorable for breaking gel and flowback.Through testing base fluid and gel made up with this thickener，it is proved that the fracturing fluid which is made up with this thickener has good rheological properties and breaking gel capability，so the damage to reservoir is little.It provided very important foundation to fracturing technical study for the shallow layer oil and gas reservoirs in the west of Sichuan and oil-gas reservoir.

Key words: low temperature, low permeability, thickener, fracturing fluid, acidity