Water Injection To Enhance Oil Recovery In Ha 6 Fracture-vuggy Reservoir

With the deepening development of Ha6 reservoir,the contradictions of development gradually were exposed for its distinct geological features,which presented complicated and specific characteristics.The production of Ha6 reservoir decreased significantly and the production of the oil field were mainly depended upon new oil wells.The production can hardly keep stable.Therefore,urgent technological measures should be taken for high efficient recovery ratio.Based on the deepen understanding of geology of Ha6 reservoir,the characteristics of the reservoir production were analyzed,the reservoir engineering was evaluated,the rational development of technical policies was studied and the corresponding tapping and harnessing measures to improve the production of Ha 6 reservoir were developed in this paper.The methods,structural interpretation,karst facies division,zonation reservoir evaluation and other static comprehensive research results,combined with the development of dynamic analysis,were used to strengthen the understanding of the reservoir geological knowledge.Besides,the production characteristics of formation energy,production decline and water change law were studied.The production characteristics of zoning and cave system were studied to comb the main problems in the process development,and the development effect of fracture-caves system was evaluate as well.The countermeasures were put forward to deal with each fracture-caves system.Moreover,the static and dynamic methods were used to demonstrate the connectivity between wells.Refined the division of the fracture units further.The study of the connectivity model of the fracture units was carried out to confirm six fracture-caves units and five suspected connected well groups.These were the basis of the unit water and gas injection method.Finally,aiming at the main development methods of Ha6 reservoir at present,the reasonable injection parameters of well spacing,well pattern,oil recovery rate,IWR and injection rate were studied,which can provide theoretical basis for the efficient development of Ha 6 reservior.