Research On Plugging Removal For Injection Increment Of Different Reservoirs In Sazhong Development Area

At present, the internal part of the Daqing Oilfield Placanticline injection wells (mainly low-permeability layer) presence of high injection pressure, injection less, and that leads to an increase of well casing damage, the effect of the development of the deterioration. Especially since the industrial application of polymer, with the recovery of large see-back Note sewage polymer content increasing, the existing quartz sand fracturing and acidizing by injection measures have been unable to effectively solve the problem by injection. Primarily embodied in: conventional quartz sand fracturing by injection effect is not satisfactory, statistical production plant quartz sand fracturing wells average period of validity of less than five months. With the addition of polymer content of oily wastewater increase water injection wells in the vicinity of the reservoir of residual polymer drag coefficient and residual oil saturation increased gradually, acidification due to measures can not be effectively dissolving residual oil, polymers and other organic plug-and failed to lower reservoir The residual polymer drag coefficient and residual oil saturation, with a large number of sewage-faced with no injection well injection means by the situation. At the same time how to implement the formation of acid sensitivity measures chemical injection years is not to solve the problems. Have developed a Placanticline internal injection wells inject low-permeability layer by supporting technical studies.The project developed a resin injection wells sand fracturing technique significantly extended the validity period of fracturing; developed can be applied to the injection wells containing polymer surfactant by injection technology, can greatly reduce the formation of polymer residual resistance coefficient and residual oil saturation; resin sand fracturing technology with live agents table by injection technology combined with a better effect by injection; to address the low-permeability layer by layer Note, in the resin and sand fracturing live Table Note agent by the measures in the study of the selectivity of supporting technology, the realization of a layer of low-permeability layer transformation; to reduce the formation of particle plug the plug on the application for downhole fishing filter. Water injection wells inject low-permeability layer y matching technology field test a total of 88 wells, to see a good buck by injection to extend the validity period of the effectiveness of measures.