JINGKUN has independently developed a salinity-resistant thickener and crosslinking agent, and has developed a Seawater-based Fracturing Fluid with original technologies such as thickener molecular structure design, efficient and easy-to-control synthesis process, and organic composite crosslinking. The system solves the problem of water demand for offshore fracturing fluid and overcomes the application problems of high seawater hardness and high salinity. The thickener can quickly swell in seawater and form a network jelly with the cross-linking agent, realizing direct seawater Preparation of fracturing fluid technology . Seawater-based Fracturing Fluid technology has the advantages of simple preparation process, low transportation cost, convenient platform purification, and abundant resources, which will become the development trend of fracturing fluids in offshore oil and gas fields in the future.
Specification
| System Turbidity, NTU | ≤30 | |
| Fracturing Fluid Base Fluid Instant Viscosities, % | ≥80 | |
Temperature Resistance And Shear Resistance | Of cross-linked fracturing fluid at 160°C under 170s-1 shear for 120min, mPa·s | ≥50 |
| Gel Breaking Performance | Gel breaking time, min | ≤240 |
| Apparent viscosity of gel breaking fluid, mPa·s | ≤5 | |
| Surface tension of gel breaking fluid, mN/m | ≤28 | |
| Interfacial tension between gel breaking fluid and kerosene, mN/m | ≤2 | |
| Apparent Viscosity of Base Fluid, mPa·s | ≥90 | |
| Crosslinking Time, s | 15~300 | |
| Gel Breaking Fluid Residue Content, mg/L | ≤600 | |
| Demulsification Rate of Fracturing Fluid and Crude Oil, % | ≥95 | |
Key Features
Seawater-based Fracturing Fluid has good viscoelastic properties and strong sand-carrying performance;
Less residue, complete gel breaking, little impact on fracture conductivity;
Low water insoluble matter, inhibits the precipitation of metal ions in seawater, and reduces reservoir damage;
Low frictional resistance reduces equipment water horsepower loss, facilitates on-site construction , and can meet (within 160°C) seawater oil and gas field reservoir reconstruction needs.
Evaluation of drag reducer effect
Using seawater to prepare fracturing fluid directly saves costs and reduces construction risks. It is suitable for large-scale fracturing reconstruction of offshore oil and gas wells and ensures the timely implementation of fracturing stimulation measures in offshore oilfields. It has been successfully applied on-site in Nanhaidong and Bohai blocks of CNOOC. The number of construction wells is nearly 30.
