3 results about "Prey predator" patented technology

This invention belongs to the field of oilfield development technology and discloses an electromagnetic monitoring fracture parameter identification method based on an improved marine predator algorithm. This invention optimizes and implements the IMPA algorithm, including improved population initialization, optimized optimization parameters, and adaptive boundary condition constraints. The improved population initialization uses a Sobol sequence to replace the traditional non-uniform random distribution population initialization. Parameter optimization proposes a staged optimization with differential partitioning to replace the traditional three-stage optimization of the MPA algorithm. Adaptive boundary condition constraints aim to discard local optimal solutions caused by parameter boundaries. A hydraulic fracturing single-fracture length model and an azimuth model are constructed. Electromagnetic monitoring involves supplying power to the fracturing wellbore and measuring the potential difference on the ground. The model forward modeling calculates the potential difference anomalies observed at all surface measuring points under the constructed single-fracture model, achieving precise identification of the single-fracture length and azimuth, thereby guiding the evaluation of hydraulic fracturing effectiveness.

Duck nesting container (10, 36) comprising a substantially tubular, light- and air-permeable shell (12, 36) enclosing a nesting hollow, with a preferably front-end access opening (20) and preferably a tongue-shaped projection (26) extending from a bottom edge (22) of the access opening (20) as an entry or landing ramp. To improve protection against nest predators, especially birds of prey, a projecting protective shield (30) extends from an upper edge (28) of the access opening (20).