Virtual Prototyping Design And System Energy-saving Research For Heave Compensation Bench

Semi-submersible platform or floating drilling ship and other floating drilling devices are mostly used to drill in the deep-sea oil development. The heave motion of drilling platforms is caused by the wave. The heave motion leads to the motion of drill string, which results in the instability of drilling pressure and reduces the service life of drill bits, or even has to stop drilling, increases the drilling costs. In order to research the heave compensation system and the system energy-saving better, we need to carry out experimental research work against heave compensation system.In order to research the established heave compensation test bench for drill string better, we import the three-dimensional model of the test bench into system dynamics analysis software ADAMS, so virtual prototype of heave compensation test bench for drill string is established after merging components, removing unwanted components in simulation, and adding appropriate deputy campaign.With the principle of SAHC valve control, hydraulic system diagram is established in ADAMS, and we determined parameters according to structural parameters of test bench; According to control parameters of test bench in the course of experiment, we determined parameters of various hydraulic components. After simulation, we contrast simulation results and experimental results, to determine the correctness of virtual prototype model of test bench, and in this context, we determined that the factors can affect the compensation effect and compensation efficiency in the passive compensation, which includes compensation cylinder accumulator volume, compensation cylinder accumulator pre-charge pressure, load cylinder accumulator volume and load cylinder accumulator pre-charge pressure. In the semi-active compensation, change trend of compensation effect and compensation efficiency is determined when parameters are changed such as compensation cylinder accumulator volume, compensation cylinder accumulator pre-charge pressure, load cylinder accumulator volume, load cylinder accumulator pre-charge pressure, pump flowrate, scale factor in the hydraulic valve control function. And we determined that the parameters mentioned above have the change can impact system energy, which can be referred for the selection of control parameters of test bench; In the model, by simulation we can carry experiments that can't be carried in the actual test bench, such as the work situation of breaking off the drill pipe, the work situation of the load cylinder accumulator haywire, and we can determine the damage of the test bench in the relevant work case by quantifying expression.In the simulation of AHC pump and valve control, simulation model is verified by compared the experimental curve and simulation curve, and compared the two control methods by the curve which is drawn with the experimental data.