Evaluation Of The Effect Of Water Injection Development In Yuan 284 Well Area In Longdong Area

At present,low-permeability reservoirs account for a large proportion of China's oil and gas resources reserves,so it is particularly important to study how to effectively develop low-permeability reservoirs.At present,water injection development is still the most important development tool in this category.Therefore,it is of great significance to study the effect of water injection development in low permeability reservoirs.The Yuan 284 well area is a typical low permeability ultra low permeability reservoir.According to the geological characteristics and reservoir characteristics of the block,according to the principle of stratigraphic division and division,the block chang 63 reservoir is divided into 9 small layers,from tectonic features,sedimentary features,sand body distribution and reservoir heterogeneity characteristics.In this paper,the geological characteristics of the block are analyzed and studied.According to the development status of the block,the dynamic characteristics of the block are produced from the aspects of water injection efficiency,oil well water seepage,production decline law,and horizontal and vertical water flooding conditions.The analysis was carried out;the factors affecting the development effect of reservoir water injection were analyzed in depth.Based on the previous research,the water injection development difficulty evaluation system,the water injection development potential evaluation system and the developm ent effect evaluation system were established for the current situation of the block.The fuzzy comprehensive analysis method based on fuzzy mathematics was used to evaluate the established evaluation system.Finally,the pilot test results of the block transformation water injection development method were analyzed and evaluated.The following research results are obtained:(1)The sand body of the 631 reservoir is relatively developed in the study area,and the distribution of sand bodies in the chang 632 and 633 reservoirs is small;the physical properties are relatively heterogeneous in the longitudinal direction,and the surface is 631.The physical properties are weaker heterogeneity,and the physical properties of the chang 632 and the chang 633 reservoirs show strong heterogeneity.(2)At present,the characteristics of seeing water in high-water wells are mainly crack type.The high heterogeneity of the reservoir is the main reason for the contradiction of the water absorption profile of the inj ection wells in this area.(3)Quantitative analysis results show that the water injection development of Yuan 284 block is difficult,but it has certain water flooding development potential,and the current water inj ection development effect is poor.(4)The overall effect of changing the water inj ection development mode is better.The wells with volumetric fracturing are affected by geological factors and construction factors.The wells with medium production time before entering the mining and the stable production stage are affected by geological factors.The construction parameters are not the main factors affecting the transfer effect of the inj ection wells factor.Through this research,a systematic evaluation method was proposed to evaluate the effect of water injection development in area 284,and a deeper understanding of the geological characteristics and development status of the block was made,which was conducive to the adj ustment of later development measures.