Acid Fracturing proves to be a fitting choice for formations sensitive to alkali, carbonate reservoirs, and shale oil reservoirs. Its primary application lies in fracturing operations within oil and gas layers, provided the temperature remains below 150°C. This comprehensive system encompasses four key components: JK1006 thickener, non-toxic crosslinking agent, acid, JK-ZP drainage aid, and JKSJ fungicide. These elements collectively offer a range of benefits, including elevated viscosity, robust carrying capacity, minimal filtration loss, reduced friction, cost-effectiveness, favorable environmental performance, and a substantial enhancement in production output.
Specification
| System PH | 3.0 ~ 6.0 | |
| Crosslinking Time, s | 30 ~ 180 | |
| Temperature Resistance and Shear Resistance | Of cross-linked fracturing fluid at 120°C for 170s-1 shear for 120min, mPa·s | ≥50 |
| Gel Breaker Performance | Gel breaking time (when the reservoir temperature is lower than 95°C, the temperature at gel breaking is the reservoir temperature; when the reservoir temperature is higher than 95°C, the temperature at gel breaking is 95°C), min | ≤120 |
| Kinematic viscosity, mm 2/s | ≤5 | |
| Surface tension, mN/m | ≤28 | |
| Interfacial tension, mN/m | ≤2 | |
| Residue content, mg/L | ≤350 | |
| Anti-expansion rate, % | ≥80 | |
Key Features
Thickener thickening speed is fast: the thickener is added to water and mechanically stirred to disperse, and the viscosity can be increased rapidly, which can realize continuous mixing.
Good heat resistance and shear resistance: the temperature resistance of acidic system can reach 150°C.
The crosslinking time is adjustable.
Strong ability to carry sand.
The anti-swelling performance is good, no need to add anti-swelling agent, and the anti-swelling rate of the gel breaking solution can reach more than 75%.
Evaluation of drag reducer effect
Acid Fracturing can effectively carry sand and transport proppant, realize simultaneous acid erosion and sand carrying, dissolve calcium plugs, rock cement and formation pores in the near wellbore area, form an uneven dissolution surface, and communicate natural fractures, can form longer and multi-branched acid etching-propped composite fractures in the reservoir section, restore or improve formation porosity and permeability, prevent clay swelling and migration, and improve the stimulation effect of oil and gas wells. At the same time, it eliminates the disadvantages of traditional alkaline fracturing fluids reacting with rock formations to form insoluble sediments, affecting permeability, and scaling on the surface of construction equipment.
