Experiment Study In Cuttings Transport With Foam

The foam fluid have showed great potential for application in the oil industry areas such as drilling,well completion,oil production.Foam has been proven success in sand and well washing,mixing channel plugging,selective acidizing,displacement and pressure of water cone,profile with gravel pack and the mixed residual acid etc.In this paper,foam rheology and sand-carrying capacity was studied in horizontal and vertical tube with a set of large foam rheological and sand-carrying capacity test system.The law of foam sand-carrying capacity in the vertical and horizontal pipe experiment was researched.The foam fluid rheology model quality is obtained by experiments.Moreover,foam structure and aggregation were studied by foam scanning and the microscope structure of sand surface was scanned by 3 d scanning microscope system.According to the needs of the experiment with the optimum selection of foam fluid mixing method,based on the five types of foaming agent of foam fluid foaming volume,half-life,the surface tension of the bubble and formation water salinity,temperature,crude oil,to the effect of foam fluid,optimizing the foaming performance superior foaming agent-HY-2.At the same time,in order to environmental protection and convenience of bubbles and quartz sand separation,cancellation bubble agent has carried on the optimization,the results show that both antifoaming agent has very good antifoaming ability.Experimental study shows that the foam fluid rheology model belongs to the power law fluid when the foam quality is 40%,60% and 75% and viscosity of foam increases with the increasing of foam quality,this is consistent with the mentioned in the literature.In the vertical tube,the friction pressure drop gradient of foam increases with the increasing of foam quality,flow velocity,sand grain size and decreases with the increase of concentration of foaming agent.The largest sand-carrying concentration increases with the increasing of velocity of bubble,foam quality and sand grain diameter and decreases with the increasing of concentration of foaming agent.In the horizontal tube,foam fluid friction pressure drop with a bubble fluid flow rate(velocity),increase with the increasing of the concentration of foaming agent and foam quality of foam fluid in the maximum carrier as the flow of foam fluid and increase with the increasing of the concentration of foaming agent,with the increase of foam quality first increases then decreases,this may be due to sand under gravity to increase in line at the bottom of the sedimentary and interaction between sand and dry foam bubbles burst.The dynamic tracing fluid microscopic photos were obtained by foam scanner.Different foam quality can be seen from the microscopic image.Foam with quality from 40% to 60% is wet bubble,the bubble is spherical.Foam with quality 70% is a few bubbles as the polyhedron,so easy to broken during collisions with sand.By the depth of field of 3d scanning microscope system,the sand is seen that flat surface is uneven,which makes bubbles burst more easily when the sand interact with bubbles.