Bamage And Prevention Of Low Permeability Oil Layers

Low permeability oil layers receive easily the damage in the process of exploration and development of oil field. In order to avoid change without expectation. we should do some compatibility experiments about well fluid ,the oil layer, the crude oil and the oil layer water. However, the oil layer that has already caused the damage must use physical or chemistry method relieves.Yanchang group in the Xifeng oilfield contains lots of he clay mineral, so the acid treatment technology uses improper, which will cause two times of oil layer damage, even some of them are permanent. Therefore, preventing oil layer damage of Xifeng oilfield begin firstly with the oil layer geological feature, we determined the core sample mineral ingredient by the core sample X diffraction experiment, then make the acidified fluid selection experiment, and select the most reasonable acid liquor to 8 oil layers Yanchang group in the Xifeng oilfield ,then make the acid treatment technology experiment to discover the acid liquor enter well successively order. under the condition the same level acid liquor, the acidified effect is best.Using the best acid liquor, we make some experiment in the core sample penetration coefficient, the scanning electricity mirror as well as the the model of core flowing,which s may respond directly the acid treatment effect. As 8 oil layers Yanchang group in the Xifeng oilfield ,the acidified effect is obvious. Therefore we choose west 13 and 17 wells to carries on the acid treatment at some stages , In order to enable the acid liquor to achieve the stratum depth portion, effectively relieves in the stratum the stemming, restores the oil layer penetration coefficient.we join the clay stabilizer, ferric ion stabilizer, Sustained release and so on, At last the pour water effect of two wells after the acidified have the distinct improvement, It suggests this acidified fluid does good in the Xifeng oilfield, and it is practical and feasible way of solveing the reduction of output of chang81ow permeability reservoirs .