基于灰色关联法的滨425区块压裂效果影响因素分析

Analysis on influencing factors of fracturing effect in Bin 425 block based on grey correlation method

胜利油田滨425区块开发前期单井压裂后产量提高不明显,且油井自喷和转抽后产量差异很小。为改进下一步压裂措施,应用灰色关联法,结合该区块单井生产资料,从影响油井压裂效果的地质因素和工程因素两方面,对影响单井产量的主控因素进行分析,按权重给出了单井压后产能影响因素的排序。结果表明,排量、加砂强度、产层有效厚度和孔隙度对单井压后产量有较大影响。压裂方案设计时,在缝高可以控制的层段应合理调整改造规模,提高加砂强度和施工排量,增大改造体积,保证裂缝的长期导流能力。灰色关联法在滨425区块压裂效果影响因素分析中的研究结果,为低渗储层压裂参数优化和开发方案优选及改进提供了依据。

In the early development stage of the Bin 425 block of Shengli Oilfield,the production of a single well did not increase significantly after fracturing,and the production difference of the oil wells in spouting period and in swabbing period was very small.In order to improve the fracturing measures in the next step,the gray correlation method is applied to analyze the main control factors of the single well production from the two aspects of geological and engineering factors that affect the fracturing effect of the oil well,combining with the production data of the single well in the block.According to the weight,the ranking of the factors affecting the productivity of a single well is given.The results show that the displacement,sanding intensity,net thickness of the pay zone and porosity have a greater impact on the production after fracturing.In the design of fracturing scheme,the reconstruction scale should be reasonably adjusted in the zone where the fracture height can be controlled,the sand adding intensity and construction displacement should be increased,and the reconstruction volume should be increased to ensure the long-term conductivity of the fracture.The research results of grey correlation method in the analysis of influencing factors of fracturing effect in Bin 425 block provide a basis for the optimization of fracturing parameters and development scheme in low permeability reservoir.