The Feasible Study of Improving Production and Injection by Water Flooding in Extra-high Water Cut Period

Hydraulic fracturing is widely used in the transformation of oilfield reservoir , to improve the level of single well Nissan , the main measures to slow down the speed of the oil field production decline . Since 2005 , Sanan Development Zone full access to the extra high water cut development stage , and the fracturing tapping the potential is becoming increasingly difficult , an oil pressure hydrous rising fracturing wells layer conditions increasingly worse increased year by year , the proportion of re-fracturing the potential of the well casing damage wells proportion is increasing year by year , the past fracturing the well and layer selection principle of adaptability worse , fracturing potential , can not meet the demand of the latter part of measures to tap the potential of high water cut . The paper discusses in detail the status of the main factors affect the fracturing effects and at this stage fracturing technology development . By statistical analysis of the condition of the well and layer selection in recent years a large number of fracturing wells and fracturing effect , on the basis of dynamic and static information and monitoring data admission is more informative , more profound understanding of the underground reservoir and construct figure out the high water cut stage remaining oil distribution characteristics and laws , broaden the range of fractured wells well and layer selection , to further clarify Sanan Development Area high water cut stage fracturing well and layer selection principle , and combined measures aim layer reservoir different conditions , and summarize the method of optimizing fracturing way , layer segment portfolio construction parameters . To improve Sanan Development Area high water cut stage fracturing effect , to maximize the mining potential of the remaining oil to improve the block oil recovery provides technical support . Wells acidification increasing injection measures is to improve the water absorption capacity of single well , to improve thin poor oil utilized an effective technical means . Many types of measures by injection wells acidification , all kinds of measures to adapt to reservoir conditions , the effectiveness of measures is also uneven . Sanan Development Area high water cut stage a detailed analysis of the injection wells, the water absorption capacity of poor reasons discussed layer angry surfactant hypocapnic active water several Broken Down Note the mechanism of action of the technology , and statistical analysis of the 2008 blocks carried out by a variety of measures to test the effect of increasing injection since , on this basis , summarizes evaluated the adaptability of the various measures of the different blocks of different reservoir types of measures is clear well and layer selection principles for the future Sanan Development Zone NOTE the wells increased NOTE measures optimized to provide the strong technical guidance .