Flow field analysis on subsea pipe span with spoiler;

Dealing with the problem of vortex induced vibration (VIV) of submarine pipe span with spoiler and focusing on the asymmetry of its lift coefficient, two new concepts are proposed: lift coefficient amplitude and lift coefficient additional value according to the special structure of spoiler.

That is, A finlike spoiler is installed on the upside of pipeline, when the pipeline route is perpendicular to sea water flow, the current will erode soil beneath the pipeline and form trench to certain depth; consequently the pipeline is buried at the depth of 1～1.

The absolute open flow of natural gas wells is an important index reflecting the potential productivity of gas wells and an important basis to determine the yield of gas wells scientifically and rationally.

The BP artificial nerve network method is only in want of the primary data of the target gas well when forecasting absolute open flow and much practical testing data of a few gas wells as the samples in the same reservoir.

Absolute open flow is a important index of appraising oil/gas well production capacity,and often used in oil/gas well classification、proration and dimensionless parameters in other equations and so on,it denotes oil/gas productions under full openness of well bottom.

Numerical analysis on influence of flow-resist rib structure on extrusion flow;

Influence factors of open flow potential in condensate gas well;

One of the most important means for effective recovery of gas reservoir during its middle and late development stage is to calculate the open flow potential,investigate the deliverability and thus to adjust working condition of gas wells.

For gas well, the open flow potential of exploration well according to the gas open flowback production is estimated firstly.