煤田地质与勘探2024，Vol.52Issue(5)：67-76,10.DOI:10.12363/issn.1001-1986.23.12.0861
新型射孔动态仿真模拟及适用性评价
Dynamic simulations and applicability evaluation of novel perforation techniques
摘要
Abstract
The development and improvement of perforated completion techniques hold great practical significance and value for efficient testing and exploitation of oil and gas fields.However,conventional shaped-charge perforation for well completion of low-permeability reservoirs(e.g.,low-permeability coal seams)suffered high seepage resistance and reduced productivity due to the presence of compaction damage zones.To achieve enhanced exploitation efficiency of low-permeability reservoirs,novel perforation techniques,including self-cleaning and after-effect perforation,have been proposed.However,their perforation performance and applicability remain ambiguous.Based on the explicit time integ-ration algorithm and fluid-structure interaction mechanism of LS-DYNA,this study proposed a method for finite ele-ment modeling of dynamic perforation simulations involving strata,cement sheaths,casings,and perforation charges.For self-cleaning and after-effect perforation techniques,this study developed a dynamic numerical simulation scheme,constructed finite element simulation models,and conducted dynamic simulations.Finally,based on numerical simula-tion results,this study analyzed the applicability of the two perforation techniques.Key findings of this study are as fol-lows:(1)Compared to the conventional perforation technique,self-cleaning and after-effect perforation techniques ex-hibit decreased perforation depths but enlarged perforation diameters,which increased by approximately 15%.(2)The perforation depth and diameter were inversely proportional to compressive strength,elastic modulus,confining pressure,and directly proportional to porosity.Meanwhile,negative pressures posed minor effects on individual perforation per-formance.(3)For medium-porosity,low-permeability hydrocarbon reservoirs and those with low porosity and low per-meability,self-cleaning and after effect perforation techniques increased the perforation channel volume by about 9.55%and 12.23%,respectively compared to conventional perforation,suggesting outstanding perforation performance.The findings of this study will provide theoretical support for the design and application of self-cleaning and after effect per-foration techniques,thus holding great significance for the development of both techniques and their application to low-permeability reservoirs(e.g.,low-permeability coal seams)for production growth of oil and gas wells.关键词
自清洁射孔/后效体射孔/动态仿真/LS-DYNA/适用性分析Key words
self-cleaning perforation/after-effect perforation/dynamic simulation/LS-DYNA/applicability analysis分类
能源科技引用本文复制引用
毕刚,元沛杰,韩斐,付帅帅,吴捷敏,马颖..新型射孔动态仿真模拟及适用性评价[J].煤田地质与勘探,2024,52(5):67-76,10.基金项目
陕西省自然科学基金研究计划项目(2023-JC-YB-361) （2023-JC-YB-361）
国家自然科学基金项目(52104033) （52104033）
