Abstract: A dual-purpose sacrificial anti-swelling agent, and a preparation method and application thereof are provided and relate to the technical field of oil reservoir exploitation. The dual-purpose sacrificial anti-swelling agent is quaternized lignin, a phenolic hydroxyl group of quaternized lignin is linked with two quaternary ammonium nitrogen atoms that are located at para positions of the same six-membered ring. Raw materials used in the present disclosure are prepared from papermaking waste liquid and a by-product of flue gas desulfurization and denitrification, which not only reduces the cost, but also transforms waste materials into valuable resources. The present disclosure increases the adsorption capacity of quaternized lignin in the formation by quaternizing lignin, and enables quaternized lignin to acts as both a sacrificial agent and an anti-swelling agent through competitive adsorption, achieving multiple purposes by using one agent.

Abstract: The last sentence of the abstract has been deleted because it refers to purported merits of the invention. The abstract should not refer to purported merits or speculative applications of the invention and should not compare the invention with the prior art, therefore the abstract has been amended to delete the last sentence by Examiner's amendment.

Abstract: A method for increasing production and injection of a reservoir coupled with flue gas desulfurization and denitrification includes a flue gas desulfurization and denitrification process and a reservoir acid liquor acidizing process, where the flue gas desulfurization and denitrification process is mixing a desulfurizing and denitrating agent with H2O2 solution uniformly to prepare a solution, and spraying it into a flue gas in an opposite direction of flue gas flow, or mixing O3 into a flue gas in an opposite direction of flue gas flow, and simultaneously spraying a desulfurizing and denitrating agent solution. When the pH of the solution system reaches 6 to 6.5, the reacted waste liquor is collected as an acid liquor. The process can control atmospheric pollution, improve the economic efficiency of flue gas treatment, and can prepare acid liquor cheaply.

Abstract: The present invention discloses a method for lightning stroke identification and location on optical fiber composite overhead ground wire. In the method, according to the property that the lightning stroke will cause a sudden temperature rise at the lightning stroke position on the optical fiber composite overhead ground wire, optical fiber resources in the optical fiber composite overhead ground wire and the high-sensitivity detection and high-precision event locating capability of a distributed optical fiber temperature sensor can be fully utilized.

Abstract: A novel inorganic fine particle reinforced foam system for an oil-gas field and preparation method thereof. The reinforced foam system comprises a gas phase and a liquid phase; the gas phase is nitrogen, carbon dioxide or the air; the liquid phase is prepared from, by mass: 0.2-0.8 wt % of a foaming agent, 0.5-2.0 wt % of novel inorganic fine particles and balance of water; the novel inorganic fine particles are fine particulate matter with diameters being smaller than or equal to 2.5 microns captured and screened from the atmosphere.

Abstract: A novel inorganic fine particle reinforced foam system for an oil-gas field and preparation method thereof. The reinforced foam system comprises a gas phase and a liquid phase; the gas phase is nitrogen, carbon dioxide or the air; the liquid phase is prepared from, by mass: 0.2-0.8 wt % of a foaming agent, 0.5-2.0 wt % of novel inorganic fine particles and balance of water; the novel inorganic fine particles are fine particulate matter with diameters being smaller than or equal to 2.5 microns captured and screened from the atmosphere.

Abstract: The present invention discloses a method for lightning stroke identification and location on optical fiber composite overhead ground wire. In the method, according to the property that the lightning stroke will cause a sudden temperature rise at the lightning stroke position on the optical fiber composite overhead ground wire, optical fiber resources in the optical fiber composite overhead ground wire and the high-sensitivity detection and high-precision event locating capability of a distributed optical fiber temperature sensor can be fully utilized.