Study On Optimization Of Deep Flooding Injection Parameters In GP-05 Block With Middle-low Permeability

The GP-05 block is a medium-low permeability reservoir with an average porosity of 24.2%and an effective permeability of 301.6×10^-3?m².The reservoir permeability is low,the physical properties are poor,and the heterogeneity is strong.Until now,the GP-05 block has entered a period of high water cut development.During the development process,the problem of excessively high water cut,scattered remaining oil distribution and strong heterogeneity between layers has become more prominent.In order to solve these problems,a weak gel deep adjustment drive technology was carried out in the GP-05 block.Compared with the short period of gel profile control,the weak gel control technology can effectively improve oil recovery in the later stage of oilfield development.As a regulator,the weak gel has the characteristics of strong injection ability,controllable gelation time,strong reservoir adaptability,strong adsorption retention capacity and good anti-scourability.It can meet the requirements of high-dose injection of regulators.Adjusting the edge drive to achieve enhanced recovery.In this paper,the numerical simulation method is used to optimize the parameters and injection scheme of weak gel deep-displacement in the GP-05 block,and further solve the problems of rapid water cut rise and heterogeneity in the development process.In this paper,based on the geological profile of the GP-05 block,the three-dimensional fine geological model of the simulation area is established by Petrel,which is a kind of software.Based on the geological model,the water flooding numerical simulation model is established by using Eclipse,and the dynamic history of the production area and the single well are simulated.The distribution characteristics of the remaining oil were analyzed,and the main remaining oil types in the target area were identified as the top thick oil layer type,the imperfect mining type,the thin layer type and the well pattern uncontrollable type,and the remaining oil in the plane and vertical enrichment area,According to the numerical simulation model of water flooding and the history of water flooding fitting,the numerical simulation model of flooding and flooding in the GP-05 block is established by using CMG software,and the injection parameters of the flooding system are optimized,according to the polymer concentration,injection speed and injection volume.A total of 19 schemes were designed,and the optimal polymer concentration,injection speed and the amount of the system were optimized.The injection scheme was optimized based on the optimal injection parameters.The single-stage plug injection,high-low concentration slug alternate injection and compounding were designed.There are 8 sets of slug injection schemes.The optimal injection scheme was determined by comparative analysis of the oil production,recovery factor,water content change and tonnage polymerization.The polymer concentration of the main slug of the control system was 800mg/L,and the injection rate was 0.06PV/a,the injection volume of the solution system is 0.3PV,the injection method is composite slug mode injection,and the injection slug combination is:pre-segment plug 0.02PV+main slug 0.05PV+post slug 0.02PV+displacement liquid 0.01 PV,finally carried out the development index prediction,the recovery value can reach 4.27%,the cumulative oil increase is 6.16×10⁴t,compared with the change of the remaining oil distribution before and after the regulation and drive,the effect of the regulation is good.