Inorganic / organic nanometer composite plugging agent for drilling shale and its preparation method
By introducing flexible polymer segments into nanoparticles, an inorganic/organic nanocomposite plugging agent was prepared, which solved the problems of poor plugging effect and poor high-temperature stability of existing drilling fluid plugging agents in shale formations, and achieved multi-scale plugging and high-temperature stability.
CN119639437BActive Publication Date: 2026-06-02CHINA PETROLEUM & CHEMICAL CORP +1
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA PETROLEUM & CHEMICAL CORP
- Filing Date
- 2023-09-18
- Publication Date
- 2026-06-02
Smart Images
Figure BDA0004454254500000071
Abstract
The application discloses an inorganic / organic nanometer composite plugging agent, and each raw material and weight percentage thereof include: modified nanoparticles 0.7-3.5 parts, alkenyl amide monomer 10-50 parts, alkenyl associated monomer 0.5-3 parts, alkenyl sulfonic acid monomer 20-50 parts, alkenyl cation monomer 10-20 parts, and initiator 0.5-1.0 parts; the modified nanoparticles are formed by surface modification of nanoparticles with a coupling agent. By introducing flexible polymer segments with appropriate association and strong adsorption into rigid nanoparticles, the deformability of the nanoparticles and the connecting force between the nanoparticles and shale formations are improved, thereby improving the plugging capacity of the plugging agent for the multi-scale small pores and micro-cracks of shale formations. The plugging agent has a wide particle size distribution, has the characteristics of physical and chemical synergistic plugging, good high-temperature stability, simple preparation method, easily available raw materials and the like, and is suitable for drilling leakage in shale formations.
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