有水气藏开发早期动态储量计算方法研究
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摘要
某地区须家河组有水气藏开发早期气水关系复杂,气井普遍产水,动态储量一直难以确定。根据低渗有水气藏生产动态及渗流特征,分析应用弹性二相法、压降法不能计算其动态储量。气井产水使气藏供气能力不足,气井生产制度不合理,造成用弹性二相法计算的动态储量偏低;产水气井和水淹井测得地层压力值偏低,导致压降法计算的动态储量必然误差较大。针对两种方法的缺点,建立了更适合产水特征的物质平衡方程,提出了计算有水气藏动态储量新方法——产量不稳定分析法,在计算过程中避免了"假拟稳态"的出现和实时测量井底流压的困难。通过实例分析研究表明,该方法计算简单、实用、准确,为气井的合理配产提供依据,对有水气藏的开发具有重要意义。
Xujiahe gas reservoir is characterized by complex relationship between gas and water,and gas well produced water generally,so calculating dynamic reserve gets difficult. From analysis of the production performance and percolating characteristics of low permeability water-driven gas reservoir,the elastic 2-phase method curves and pressure drawdown curves were not suitable for calculating dynamic gas reservoir. Water in gas well cause insufficient gas supply and low formation pressure,and create the dynamic reserve calculated being on the low side. Aiming to the problem of the dynamic reserves being hard to verify for the water-driven gas reservoirs with low permeability,the material balance equation is established for water-driven gas reservoirs. A new method to calculate the dynamic reserves for the water-driven gas reservoirs with low permeability is proposed. Using the method,the dynamic reserves can be verified respectively for the water-driven gas reservoirs with low permeability. With real cases,it is demonstrated the method is simple and practical,and has important significance for the development of the water-driven gas reservoirs with low permeability.
Xujiahe gas reservoir is characterized by complex relationship between gas and water,and gas well produced water generally,so calculating dynamic reserve gets difficult. From analysis of the production performance and percolating characteristics of low permeability water-driven gas reservoir,the elastic 2-phase method curves and pressure drawdown curves were not suitable for calculating dynamic gas reservoir. Water in gas well cause insufficient gas supply and low formation pressure,and create the dynamic reserve calculated being on the low side. Aiming to the problem of the dynamic reserves being hard to verify for the water-driven gas reservoirs with low permeability,the material balance equation is established for water-driven gas reservoirs. A new method to calculate the dynamic reserves for the water-driven gas reservoirs with low permeability is proposed. Using the method,the dynamic reserves can be verified respectively for the water-driven gas reservoirs with low permeability. With real cases,it is demonstrated the method is simple and practical,and has important significance for the development of the water-driven gas reservoirs with low permeability.
引文
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12 李骞,郭平,黄全华.气井动态储量方法研究.重庆科技学院学报(自然科学版),2008;10(6):34—36Li Q,Guo P,Huang Q H.Study on dynamic reserves of gas well.Journal of Chongqing University of Science and Technology,Natural Science Edition,2008;10(6):34—36
13 Mattar L,Me Neil R,Fekete Associates Ine.The“Flowing”Gas Material Balance.JCPT,1998;(2):52—55
2 徐伟,杨洪志,陈中华.广安地区须六段气藏特征及开发策略.天然气工业,2007;27(6):19—21Xu W,Yang H Z,Chen Z H.Characteristics and development strategy of the six stage gas reservoir in Guang'an area.Gas Industries,2007;27 (6):19—21
3 吴胜和,熊琦华.油气储层地质学.北京:石油工业出版社,1998:27 —59Wu S H,Xiong Q H.Oil and gas reservoir geology.Beijing:Petroleum Industry Press,1998:27—59
4 郝玉鸿,许敏,徐小蓉.正确计算低渗透气藏的动态储量.石油勘探与开发,2002;29(5):66—68Hao Y H,Xu M,Xu X R.Correctly calculate the dynamic reserves of low permeability gas reservoir.Petroleum Exploration and Development,2002;29(5):66—68
5 王卫红,沈平平,马新华,等.非均质复杂低渗气藏动态储量的确定.天然气工业,2004;24(7):80—82Wang W H,Shen P P,Ma X H,et al.Determination of dynamic reserves of heterogeneous complex low permeability gas reservoir.Gas Industries,2004;24(7):80—82
6 Chu Weichun,Fleming C H,Carroll K M.爱尔兰近海Ballycotton气田天然气地质储量计算.天然气勘探与开发,2002;25(1):55 —61Chu Weichun,Fleming C H,Carroll K M.Calculation of natural gas reserves in the Ballycotton gas field in Ireland.Natural Gas Exploration and Development,2002;25(1):55—61
7 张宗林,赵正军,张歧,等.靖边气田气井产能核实及合理配产方法.天然气工业,2006;(9):106—108Zhang Z L,Zhao Z J,Zhang Q,et al.Verification of gas well production capacity in Jingbian gas field.Gas Industries,2006;(9):106 —108
8 吴志均,何顺利.低渗砂岩气藏地质特征和开发对策探讨.钻采工艺,2004;(4):109—112Wu Z J,He S L.Geological characteristics and development strategy of low permeability sandstone gas reservoir.Drilling Technology,2004;(4):109—112
9 秦国伟,蒲春生,秦文龙.喇嘛甸油田气顶气藏经济可采储量评价与风险分析.西安石油大学学报(自然科学版),2007;(6):28 —31Qin G W,Pu C S,Qin W L.Evaluation and risk analysis of the economic recoverable reserves of the gas cap gas reservoir in the oil field.Journal of Xi'an Petroleum University(Natural Science Edition),2007;(6):28—31
10 陈清华,杨超,王秀玲,等.基于储层构成单元的油气储量计算方法.西安石油大学学报(自然科学版),2008;(2):32—34Chen Q H,Yang C,Wang X L,et al.Calculation method of oil and gas reserves based on reservoir formation unit.Journal of Xi'an Petroleum University(Natural Science Edition),2008;(2):32—34
11 罗瑞兰,雷群,范继武,等.低渗透致密气藏压裂气井动态储量预测方法——以苏里格气田为例.天然气工业,2010;30(7):28—31Luo R L,Lei Q,Fan J W,et al.Method:Taking Sulige gas field as an example to predict the low permeability tight gas reservoir fracturing gas well dynamic reserves.Gas Industries,2010;30(7):28—31
12 李骞,郭平,黄全华.气井动态储量方法研究.重庆科技学院学报(自然科学版),2008;10(6):34—36Li Q,Guo P,Huang Q H.Study on dynamic reserves of gas well.Journal of Chongqing University of Science and Technology,Natural Science Edition,2008;10(6):34—36
13 Mattar L,Me Neil R,Fekete Associates Ine.The“Flowing”Gas Material Balance.JCPT,1998;(2):52—55