Study On Technique Of Water Shutoff Agent Targeted Delivery

Most onshore oilfield of China has entered the water development in the late,because the injected water erosion and reservoir itself heterogeneity,reservoir pore structure changed,the injected water main along the sedimentary units of the high - sudden penetration into the layer. resulting in the thickness of basically unchanged washed,there has been serious inefficient and ineffective cycle. Oil Wells after a profile modification of construction, conventional water shutoff used large plugging agent and the effect is not obvious.For large amount of blocking agent,multiple overlapping and the poor effect of conventional water shut-off,this paper,the characteristics and laws of the water reservoir analysis,a mathematical model,numerical reservoir simulation software and visualization model,plugging agent put in position,put volume,multi-point delivery,as well as blocking agents in different permeability strata of the water shut-off effects;Adapted to study the four kinds of fixed-point delivery of the blocking agent, was examined for its adaptability, inorganic chromium gel into the gel system of time can be achieved 160h, strength reached 0.060MPa, adapted to the low permeability strata near wells and far from the borehole zone plugging, application temperature of 40℃~70℃. HPAM and phenolic delayed crosslinked gel blocking agent system into a gel is a long time into the gel,strength of high strength at 80℃under the system to achieve 0.072MPa, suitable for medium-high permeability strata far wellbore plugging, application temperature of 40℃~120℃. Pairs of groups of secondary cross-linking gel plugging agent system with a long time into the plastic, into a gel time controlled, into a plastic, high strength, good stability characteristics, at 60℃under the system into a gel time can reach 400h, suitable for medium-high permeability formation zone far from the borehole plugging. Gender pre-crosslinking blocking agent blocking agent can be combined with the above apply to block special hypertonic strata and cracks formation. According to the characteristics of formation and plugging agent, this paper designated program design.delivery location and slug.