PG主体气藏开发状况研究及稳产技术对策
发布时间：2018-11-10 14:31
【摘要】：随着天然气在全球能源所占比例越来越高,高含硫气藏的开发也变得越来越重要,同时我国四川盆地高含硫气藏资源也十分丰富,探明高含硫天然气累积储量已经超过6300×108m3,约占探明天然气总储量的1/6。然而我国高含硫碳酸盐岩气藏开发技术尚不成熟,以PG气田为代表的高含硫碳酸盐岩气藏具有H2S含量高、平面与纵向上分布不均,纵向上产层复杂、储层非均质强,储集类型多为裂缝—孔隙型(孔、缝、洞),储集空间复杂,相态复杂及存在相变,部分生产井处于水体上方,受水侵影响严重等特点,因此其生产动态规律评估具有一定难度,为了能够高效开采,为PG主体气藏的开发提供技术支持和借鉴,需要对气井产能评价方法做深入研究。 气藏压力变化是气藏工程计算的重要依据,从气藏压力计算入手,应用M-B方法计算PG气田的井底流压,利用气井生产数据,结合物质平衡法计算了气井地层压力。从硫的溶解度模型出发,利用实测资料拟合Chrastil模型经验公式和相平衡溶解度计算得到了适合于PG气藏含硫气体溶解度预测公式,并且建立了含硫饱和度的计算公式。 运用生产动态数据,评价了PG气田产水情况,以及水侵对气井产能的影响,建立了PG气田的产能评价方法：一点法,改进一点法,二项式产能法,物质平衡和产能结合法。物质平衡和产能结合法考虑硫沉积对气井产能的影响,该方法是一个动态计算产能的过程,在考虑硫沉积对渗透率的影响大小基础上计算了硫沉积对气井产能影响大小。运用产能计算方法对PG主体37口生产井进行了产能评价,并通过结果对比得出了最适用于PG气田的产能计算方法。同时运用采气曲线法,节点分析法和经验法对气井进行了配产,应用油藏影响函数法,流动物质平衡法,采气曲线法对气藏单井动态储量进行了评估。针对气藏在生产过程中存在的问题,通过控水采气、封堵产水层、酸化解堵等几个方面提出了稳产技术对策,讨论了气田稳产年限并对优化方案进行了评价。
[Abstract]:With the increasing proportion of natural gas in the global energy, the development of high sulfur gas reservoir becomes more and more important. At the same time, the resources of high sulfur gas reservoir in Sichuan Basin are very rich, and the proven accumulative reserves of high sulfur gas have exceeded 6300 脳 108 m3. It accounts for about a sixth of the total proven natural gas reserves. However, the development technology of high sulfur carbonate gas reservoir in China is not mature. The high sulfur carbonate gas reservoir represented by PG gas field is characterized by high H 2S content, uneven distribution in plane and longitudinal, complex vertical production layer and strong heterogeneity of reservoir. The reservoir types are mostly fracture-pore type (pore, fracture, cavity), the reservoir space is complex, the phase state is complex and phase transition exists, and some production wells are above the water body, which are seriously affected by water invasion, etc. Therefore, it is difficult to evaluate its production performance law. In order to be able to produce efficiently and provide technical support and reference for the development of PG main gas reservoir, it is necessary to make a deep study on the method of gas well productivity evaluation. Gas reservoir pressure variation is an important basis for gas reservoir engineering calculation. Starting with gas reservoir pressure calculation, M-B method is used to calculate bottom hole flow pressure of PG gas field, and gas well production data is used to calculate gas well formation pressure combined with material balance method. Based on the sulfur solubility model, the empirical formula of Chrastil model and the calculation of phase equilibrium solubility are used to fit the empirical formula of Chrastil model and the formula for predicting the solubility of sulfur containing gas in PG gas reservoir is obtained, and the calculation formula of sulfur saturation is established. Based on the production dynamic data, this paper evaluates the water production situation of PG gas field and the influence of water invasion on gas well productivity, and establishes the productivity evaluation methods of PG gas field: one point method, improved one point method, binomial productivity method, material balance and productivity combination method. The influence of sulfur deposition on gas well productivity is considered by the combination of material balance and productivity. This method is a process of dynamic calculation of productivity. The influence of sulfur deposition on gas well productivity is calculated on the basis of considering the influence of sulfur deposition on permeability. The productivity evaluation of 37 production wells in the main body of PG is carried out by using productivity calculation method, and the most suitable productivity calculation method for PG gas field is obtained by comparing the results. At the same time, gas recovery curve method, node analysis method and empirical method are used to produce gas wells. The reservoir influence function method, flow material balance method and gas recovery curve method are used to evaluate the single well dynamic reserves of gas reservoir. In view of the problems existing in the production process of gas reservoirs, this paper puts forward the technical countermeasures of stabilizing production by controlling water and gas production, plugging water producing layers and removing water plugging by acid, discusses the years of stable production of gas fields and evaluates the optimization scheme.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE37
本文编号：2322724
[Abstract]:With the increasing proportion of natural gas in the global energy, the development of high sulfur gas reservoir becomes more and more important. At the same time, the resources of high sulfur gas reservoir in Sichuan Basin are very rich, and the proven accumulative reserves of high sulfur gas have exceeded 6300 脳 108 m3. It accounts for about a sixth of the total proven natural gas reserves. However, the development technology of high sulfur carbonate gas reservoir in China is not mature. The high sulfur carbonate gas reservoir represented by PG gas field is characterized by high H 2S content, uneven distribution in plane and longitudinal, complex vertical production layer and strong heterogeneity of reservoir. The reservoir types are mostly fracture-pore type (pore, fracture, cavity), the reservoir space is complex, the phase state is complex and phase transition exists, and some production wells are above the water body, which are seriously affected by water invasion, etc. Therefore, it is difficult to evaluate its production performance law. In order to be able to produce efficiently and provide technical support and reference for the development of PG main gas reservoir, it is necessary to make a deep study on the method of gas well productivity evaluation. Gas reservoir pressure variation is an important basis for gas reservoir engineering calculation. Starting with gas reservoir pressure calculation, M-B method is used to calculate bottom hole flow pressure of PG gas field, and gas well production data is used to calculate gas well formation pressure combined with material balance method. Based on the sulfur solubility model, the empirical formula of Chrastil model and the calculation of phase equilibrium solubility are used to fit the empirical formula of Chrastil model and the formula for predicting the solubility of sulfur containing gas in PG gas reservoir is obtained, and the calculation formula of sulfur saturation is established. Based on the production dynamic data, this paper evaluates the water production situation of PG gas field and the influence of water invasion on gas well productivity, and establishes the productivity evaluation methods of PG gas field: one point method, improved one point method, binomial productivity method, material balance and productivity combination method. The influence of sulfur deposition on gas well productivity is considered by the combination of material balance and productivity. This method is a process of dynamic calculation of productivity. The influence of sulfur deposition on gas well productivity is calculated on the basis of considering the influence of sulfur deposition on permeability. The productivity evaluation of 37 production wells in the main body of PG is carried out by using productivity calculation method, and the most suitable productivity calculation method for PG gas field is obtained by comparing the results. At the same time, gas recovery curve method, node analysis method and empirical method are used to produce gas wells. The reservoir influence function method, flow material balance method and gas recovery curve method are used to evaluate the single well dynamic reserves of gas reservoir. In view of the problems existing in the production process of gas reservoirs, this paper puts forward the technical countermeasures of stabilizing production by controlling water and gas production, plugging water producing layers and removing water plugging by acid, discusses the years of stable production of gas fields and evaluates the optimization scheme.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE37
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