PLUGGING REMOVING AND SAND CONTROL TECHNOLOGY FOR RESERVOIRS OF SHALY AND LOOSE SANDSTONE

In oil-field development courses,the problem of sand-flowing in large quantities and serious polluted plugging exists simultaneously in the moderately or highly shaly,low temperature,loose sand oil reservoirs is a difficult technical problem needs to be solved urgently.Traditional mechanical and chemical sand control for this kind of oil reservoir is ineffective or causes blocking of porosity,leading to the decrease of liquid produce.This thesis chiefly analyses the experience and lessons in the course of sand exclusion and plugging removing in quit oilfield.A technology called"three-new technology which combines sand control with plugging removing theory,new prescription and new technology was developed.The principle of acid plugging removing was applied to eliminate the polluted plugging,while the electric potential at the surface of sand grain can be altered and the force gathering the sand grain can be enhanced,which play a key role of sand control.Good results were achieved after using this technology in Quit-field,and the advantages and practicability of this technology were proven.