水平缝四点井网整体压裂裂缝参数优化设计

大庆长垣内部油田经三次加密调整后,部分区块采用四点法面积井网布井,由于井距小、地下油水关系复杂,为了实施水力压裂增产改造,必须选择合适的裂缝参数,以避免油井过早被水淹.为此,针对四点井网以及水力压裂后形成水平裂缝的特点,结合萨南油田表外储层的地质特征,建立了水平缝整体压裂改造后油水井生产动态预测模型,以整体压裂改造后的增产量、采出程度和经济效益为目标,进行了裂缝参数(裂缝半径、导流能力)优化研究.该研究成果在萨南油田实际应用取得了较好的增产效果和经济效益,为这类油田整体压裂改造裂缝参数优化设计提供了理论依据.

Optimization design of integral fracturing parameters for four-spot well pattern with horizontal fractures

After employed tertiary infilling,four-spot well pattern has been applied in part of blocks in Changyuan interior of Daqing Oilfield.Due to the close well spacing and complicated oil-water relationship in the reservoir,it is necessary to choose some appropriate fracture parameters during hydraulic fracturing,in order to avoid premature water breakthrough in oil wells.Aiming at the characteristics of horizontal fractures formed in four-spot well pattern by using hydraulic fracturing and according to the geologic features of non-tabulated reservoirs in Sanan Oilfield,a production model for predicting operation of oil and water wells was build up.With the purpose of increase in oil production,oil recovery and economic benefit,some fracture parameters such as radium and conductivity were optimized.The better stimulation and economic benefits have been achieved in Sanan Oilfield.The result can provide theoretical references to the optimization of fracture parameters in integral fracturing stimulation in such kind of oil field.