Research On Reservoir Damage Mechanism And Prediction Of Severity Of Water Lock In Gulongnan Area

With the continuous exploration and development in-depth, poll type shows its increasing complexity and diversity. There are more and more difficult problems of exploration and development to solve , people pay more attention to the protection of oil and gas technical requirements .Reservoir damage has the characteristics of local conditions, so it is necessary to study the mechanism in Gulongnan area.According to standard test procedure, the results of formation sensitivities are as follows: water sensitivity (medium to high), rate sensitivity (medium), salt sensitivity (medium), alkali sensitivity (medium),acid sensitivity (medium). In the actual construction, we should consider using clay stabilizer and controlling the salinity of working fluid. We should avoid using higher alkali oil displacement fluid in tertiary recovery aftertime and using iron hydronium stabilizerin acidification. On the base of sensitivity analyse, the formation damage mechanisms was researched in the paper, the main reason of leading to the formation damage is adventitious fluid invading, it means the main damage way is liquid phase damage,so we should control the quantity and quality of fluid coming into reservoir.Through the above-mentioned research, we know that the water lock of Gulongnan area is more serious, it is necessary to do some water lock research, however artificial measurement is not only time-consuming ,but also laborious, so we apply the gray relevancy analysis method to improve its prediction, the results of predicting matches to the results of testing. And compared with traditional predicted methods ,the results show that the improved method of gray relevancy forecast accuracy and the amount of calculation is small.