一种用于长距离输送充填的超轻质陶粒支撑剂的制备方法
By modifying the surface of the ceramic proppant and performing segmented oxidation pre-calcination, a gradient structure with a dense outer layer and a porous inner layer is formed. This solves the problems of long-distance transport of low-density ceramic proppant in low-viscosity fracturing fluid and surface integrity and anti-fracture properties under high closure pressure, achieving a balance between high strength and long-term conductivity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TIANJIN YICHUANG ENERGY TECH CO LTD
- Filing Date
- 2026-04-02
- Publication Date
- 2026-07-17
AI Technical Summary
Existing low-density ceramic proppant cannot simultaneously achieve long-distance transport capability in low-viscosity fracturing fluids and maintain surface integrity, fracture resistance, and long-term conductivity under high closure pressure. Current technologies lack precise process methods for controlling the gradient structure from the surface to the interior.
After granulation by mixing ultrafine kaolin, α-alumina micro powder and soluble starch, green balls are formed by polyvinyl alcohol binder. Polysilicate precursor sol, pseudoboehmite sol and α-phase nano-alumina isopropanol dispersion are sprayed onto the surface of the green balls in stages. Mullite crystal nuclei powder is then embedded and combined with segmented oxidation pre-calcination to form a gradient structure that is dense on the outside and porous on the inside.
It achieves a balance between low density characteristics and high strength and high conductivity, improving the compressive strength and long-term conductivity of ceramsite proppant, and ensuring stability for long-distance transport and high closure pressure in low-viscosity fracturing fluid.