The Research Of Optimal Design For Development Of Side-tracking Horizontal Wells In Bottom Water Reservoirs

Bottom water reservoirs are very common in oil fields at home and abroad.As the oil field begins to enter the middle and late stages of development,the condition of damage to the conventional straight well casing becomes more and more serious,and some wells rely solely on conventional workover techniques that cannot be repaired.Through the side drilling,can improve the production of oil wells,to improve the utilization of oil wells play a significant role,is conducive to improving the recovery rate and the development effect.It also can greatly save the cost of ground construction and drilling costs.Therefore,it has good economic benefits.In this paper,based on the characteristics of bottom water reservoirs,the sensitivity analysis of the factors influencing the rise of bottom water was carried out by combining the single factor and the multivariate factors by numerical simulation and reservoir engineering methods.The influence law of each factor was summarized,rising main factor.The feasibility of the horizontal drilling in the bottom water reservoir is evaluated.The fuzzy comprehensive evaluation method is used to analyze the adaptability of the side drilling in the bottom water reservoir,and the existing side drilling is classified by fuzzy clustering.The classification effect of different types of wells was evaluated,and the production effect was predicted for the new wells.Based on the conceptual model of the actual block and the reservoir engineering method,the single factor study and the multi-factor orthogonal analysis were carried out on the mining technology policy such as the length of the sidetrack,the height of the avoidance,the timing of sidetracking,and he best results are given.Finally,the design results are verified by mine examples.The results show that the main factors influencing the rise of bottom water are oil thickness,water avoidance height and reservoir heterogeneity.The fuzzy screening model of sidetracking in the bottom water reservoir can reflect the adaptability of the lateral drilling of the oil layer,and the fuzzy clustering results have better predictive effect on the new well.Horizontal wells in the horizontal drilling under the reasonable design conditions,precipitation and oil effect is obvious.The results of this study has certain guiding significance for the implementation and development of horizontal drilling horizontal wells in similar reservoirs,which provides a reference for the more effective development of bottom water reservoirs.