摘要
高磨地区震旦系缝洞型气藏孔隙、溶洞、裂缝搭配关系复杂,储层渗流能力的较大差异导致难以准确预测气藏的采出程度。为认识并量化储层非均质性对储量可采性的影响,开展地层条件下各类储层岩心的串、并联衰竭式开发实验。通过改变实验压差和岩心的组合方式,明确流量与压力随时间的变化关系,评价现有工艺技术条件下储层类型、生产制度对气藏采出程度的影响。串联实验中,气体流动路径为孔隙→孔洞→裂缝-孔洞时,岩心采出程度最大;气体流动路径为孔洞→裂缝-孔洞→孔隙时,采出程度减少14%。并联实验中,实验压差5 MPa时最终累计产气量最大,但由于高渗岩心孔隙压力下降过快,后期累产气量增加幅度减小;实验压差3 MPa时,各类岩心同时供气的时间延长,实现了"动态供给平衡",累产气量增加幅度保持稳定。该实验研究从微观上认识了不同类型储层组合下的产量贡献特征,量化了低渗储层对高渗储层的制约性,对缝洞型气藏早期开发对策的制定具有指导意义。
The Sinian fractured-vuggy gas reservoirs in Gaomo area are complex in the collation relationships between pores,dissolved vugs and fractures,and their percolation capacity of reservoirs varies greatly,so it is difficult to predict their degree of reserves recovery accurately. In this paper,series and parallel depletion development experiments were carried out on various reservoir cores in reservoir conditions to understand and quantify the effect of reservoir heterogeneity on reserves recoverability. The relationships of flow rate and pressure vs. time were defined by changing experimental pressure difference and core combination modes. And the effects of reservoir type and production system on the degree of reserves recovery of gas reservoir based on existing technologies were evaluated. In the series experiments,the degree of reserves recovery is the highest when the gas flows along the path of pore→vug→fracture→vug,and it decreases by 14% when the gas flows along the path of vug→fracture→vug→pore. In the parallel experiments,the ultimate cumulative gas production is the highest when the experimental pressure difference is 5 MPa,but the increase amplitude of cumulative gas production declines in the late stage for the pore pressure of high-permeability cores drops too fast. When the experimental pressure difference is 3 MPa,simultaneous gas supply period of various cores is prolonged,so "dynamic supply balance" is realized and the increase amplitude of cumulative gas production is kept stable. By virtue of the experimental study,the production contribution characteristics of different reservoir combinations are microscopically recognized,and the restriction of low permeability reservoirs to the high permeability reservoirs was quantified. The research results play an instructive role in preparing the early development strategies of fractured-vuggy gas reservoirs.
引文
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