收稿日期: 2014-10-17
修回日期: 2015-01-05
网络出版日期: 2015-04-10
基金资助
中国石化科技部项目“川东北碳酸盐岩超高压气藏开发对策研究”(编号:P08070)资助.
Percolation Mechanism and Production Performance of Super High Pressure Gas Reservoir
Received date: 2014-10-17
Revised date: 2015-01-05
Online published: 2015-04-10
超高压气藏渗流机理不同于常规气藏，认识此类气藏开发机理，搞清气藏开采规律，是科学高效开发该类气田的关键。针对川东北地区碳酸盐岩超高压气藏地质条件，通过应力敏感实验研究了该类气藏开采过程中岩石的变形特征，确定了储层孔隙度、渗透率等参数随压力的变化关系；在此基础上，建立了考虑储层裂缝和基质变形、高速非达西流动的碳酸盐岩超高压气藏气、水两相渗流数学模型和数值模型，利用该模型研究了气井开采动态特征。研究表明:超高压碳酸盐岩气藏储层渗透率应力敏感性很强，渗透率随有效应力增加表现为明显的3段，有效应力增加小于20MPa前渗透率急剧降低，下降幅度达45%～65%；有效应力增加介于20～60MPa之间时渗透率下降幅度为20%～25%；有效应力增加大于60MPa后，渗透率基本不变；储层孔隙度对应力的敏感性小，当有效应力增加40MPa时，孔隙度损失小于10%；孔隙度和渗透率越小，岩石应力敏感性越强；岩石变形对裂缝—孔隙型超高压碳酸盐岩气藏生产影响明显，气井初期配产不能太大；建立的考虑岩石变形、高速非达西的双重介质模型能准确预测碳酸盐岩超高压气藏的开采动态。
王卫红，刘传喜，刘华，穆林，伦增珉，郭艳东 . 超高压气藏渗流机理及气井生产动态特征[J]. 天然气地球科学, 2015 , 26(4) : 725 -732 . DOI: 10.11764/j.issn.1672-1926.2015.04.0725
The filtration mechanism of super high pressure gas reservoir is different from normal pressure gas reservoirs.There are some special phenomena when developing this kind of gas reservoir,such as rock deformation,high velocity non-Darcy flow,and so on.Aiming at the reservoir characters of carbonate super high pressure gas reservoir in northeast of Sichuan,this paper did stress-sensitivity tests of the rock which simulated the real reservoir condition to study the percolation characters of rock during development.These tests confirmed the variation relationships of the porosity vs.pressure and permeability vs.pressure.Based on this,the gas-water two-phase fluid flow filtration mathematical model and numerical model have been established.These models considered the high velocity non-Darcy flow,and the deformation of fracture and matrix of carbonate super high pressure gas reservoir.These models are used to study the producing characteristic of gas well,and to analyze the influence of the rock deformation.The results show the stress-sensitivity degree of rock porosity and permeability are different.The stress-sensitivity of natural fractured rock permeability was the most powerful in early stage of rock deformation,and permeability decreases 45%-65% when effective pressure increases by 20MPa,and then taper.The stress sensibility of rock porosity is low.When effective pressure increases by 40MPa,the porosity decreases by less than 10% .The less the porosity and permeability,the larger the stress-sensitivity.The rock deformation influenced the production obviously of carbonate super high pressure gas reservoir,so the proration could not be too high in early stage of production.The dual-media model which considered the deformation of rock and the high velocity non-Darcy flow could predict gas well performance accurately.
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