Abstract: In a method for mineral comminution energy determination and intelligent liberation degree identification based on morphological characteristics of particles, magnetite ore is comminuted with a drop weight impact testing machine and then subjected to particle size classification. Liberation degrees of the comminuted particles of some particle size classes with small relative particle sizes when different comminution energy is applied are detected and recorded using a mineral liberation analyzer. Profiles of liberation degrees of different minerals are established according to the detected data. The profiles are analyzed to determine appropriate comminution energy E, and then the comminuted particles of the particle size classes with the comminution energy are scanned by an electron microscope to obtain electron microscope images. Proportions of intergranular fractures of the particle size classes are counted. Comminution energy E1 corresponding to the particle size classes is calculated based on a function.

Abstract: Disclosed are a strong salt-resistant self-degradation plugging agent for water-based drilling fluid and a preparation method therefor. The preparation method includes: modifying unsaturated polyhydroxyalkanoate by using 2-acrylamide-2-methylpropanesulfonic acid to prepare modified polyhydroxyalkanoate; modifying lignin by using an ammonium halide salt to prepare quaternized lignin; and melting and blending the quaternized lignin and the modified polyhydroxyalkanoate to obtain the strong salt-resistant self-degradation plugging agent for water-based drilling fluid. The preparation method is mature and reliable, and is suitable for industrial production. The plugging agent has strong salt resistance and good stability, and has a degradation rate less than 15% within 7 days, which can effectively plug micron-sized fractures in shale formations. Meanwhile, the plugging agent may be directly added to the water-based drilling fluid, and has little effect on the rheology.

Abstract: The invention discloses an organic-inorganic nanocomposite gel sealing agent and oil-based drilling fluid. The sealing agent used for the oil-based drilling fluid is organic-inorganic nanocomposite gel, and the synthetic raw materials of the organic-inorganic nanocomposite gel includes molybdenum disulfide, 2-ethyl acrylic acid, N, N-dimethylacrylamide and N,N-methylene bisacrylamide; the drilling fluid includes the organic-inorganic nanocomposite gel provided by the invention.

Abstract: Disclosed are a high-temperature-resistant tertiary amine-grafted silica nano-plugging agent and water-based drilling fluids, relating to oil-gas field drilling. The nano-plugging agent is prepared from a hydrazine compound, a diallyl compound, an enamine compound, silica particle, and an amino-containing silane coupling agent by stepwise reaction. The nano-plugging agent has a grain size of 58-280 nm.

Abstract: The invention discloses an organic-inorganic nanocomposite gel sealing agent and oil-based drilling fluid. The sealing agent used for the oil-based drilling fluid is organic-inorganic nanocomposite gel, and the synthetic raw materials of the organic-inorganic nanocomposite gel includes molybdenum disulfide, 2-ethyl acrylic acid, N, N-dimethylacrylamide and N,N-methylene bisacrylamide; the drilling fluid includes the organic-inorganic nanocomposite gel provided by the invention.

Abstract: Disclosed are a high-temperature-resistant tertiary amine-grafted silica nano-plugging agent and water-based drilling fluids, relating to oil-gas field drilling. The nano-plugging agent is prepared from a hydrazine compound, a diallyl compound, an enamine compound, silica particle, and an amino-containing silane coupling agent by stepwise reaction. The nano-plugging agent has a grain size of 58-280 nm.

Abstract: Disclosed are various embodiments for a multi-surface cart that can be modified or configured to move along different underlying surfaces. The cart can include a transport unit and an adjustable base unit that extends below a bottom surface of the transport unit. The adjustable base unit can be adjusted such that the cart is movable along a first surface in a first configuration with a plurality of wheels on the first surface and is moveable along a second surface in a second configuration with an underlying panel of the adjustable base unit on the second surface.