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产品展厅>>项目研发>>深层大气田控水开发基础理论及技术方法研究

气井合理配产是气井开发一直在探索,但远没有解决的课题。由于不同气田的地质条件(裂缝、基岩、溶洞等)、完井方式(射孔、压裂等)、边底水位置、数量等不同,配产方式也不相同。例如中石油磨溪龙王庙是裂缝-孔洞(隙)型气藏,克拉2气田为孔隙型,而迪那是裂缝-孔隙型,中石化川科及元坝等大气田是典型的海相沉积,储层埋藏深,是含有天然型裂缝的储集体,通过酸化式压裂可获得高产气量。

由于龙王庙、克拉及川科等气藏地层条件的差异,气藏流动模式也各不相同,试井资料解释、生产数据分析及数值模拟等大型计算分析所依赖的渗流模型也不相同。因此难以形成一种配产模型和标准,也难以获得气井配产统一的公式,甚至对复杂地质构造和开发模型,渗流数学方程都难以建立(或存在流动方程也难以求解)。因此,本项目将从气井配产、理论公式、室内实验、等效数值模拟及大数据等四个方面进行全面研究,力争在气井配产基础理论上有所突破,从而指导我国大气田开发。

考虑水侵优势通道指数的气井合理配产方法研究:完成见水时间理论推导,敏感参数分析,初步完成大数据材料整理。

不同类型储层驱替与渗吸过程相对渗透率曲线研究:完成样品驱替与渗吸实验,完成分子动力学建模。

考虑相渗滞后和水封气效应的等效数值模拟方法研究:完成等效数值模拟方法研究完成水封气水膜测量实验,继续分子动力学计算。

基于大数据分析的气田开发优化技术政策研究:完成大数据分析,筛选出见水时间影响因素,给出合理配产方法。

我公司多年来进行气田控水开发研究,针对不同气田的地质条件(裂缝、基岩、溶洞等)不同,完井方式(射孔、压裂等)不同,边底水位置、数量等不同,研究气井配产理论;以气田控水开发和提高采收率为目标,开展基础理论与技术方法研究,未来在我国大气田开发有很好的领先优势。

Products>>Project Development>>Study on basic theory and technical method of deep atmospheric field water control development

Reasonable production allocation of gas wells is a subject that has been explored in gas well development, but it is far from being solved. Due to different geological conditions (fractures, bedrock, karst caves, etc.), well completion methods (perforation, fracturing, etc.), edge and bottom water positions and quantities of different gas fields, the production allocation methods are also different. For example, Moxi Longwangmiao is a fracture-cave gas reservoir, Kela 2 gas field is a pore reservoir, and Dina is a fracture pore reservoir. Large gas fields such as Sinopec Chuanke and Yuanba are typical marine deposits with deep reservoir burial. They are reservoirs containing natural fractures. High gas production can be obtained through acid fracturing.

Due to the difference of formation conditions of Longwangmiao, Kela and Chuanke gas reservoirs, the flow patterns of gas reservoirs are also different, and the seepage models relied on for large-scale calculation and analysis such as well test data interpretation, production data analysis and numerical simulation are also different. Therefore, it is  difficult to form a production allocation model and standard, and to obtain a unified formula for gas well production allocation. Even for complex geological structures and development models, it is difficult to establish seepage mathematical equations (or solve flow equations). Therefore, the project will conduct comprehensive research from four aspects: gas well production allocation, theoretical formula, indoor experiment, equivalent numerical simulation and big data, and strive to make a breakthrough in the basic theory of gas well production allocation, so as to guide the development of large gas fields in China.

Research on reasonable production allocation method of gas wells considering water invasion dominant channel index: complete theoretical derivation of water  breakthrough time, analysis of sensitive parameters, and preliminary sorting of big data  materials.

Study on relative permeability curve of different types of reservoir displacement and imbibition process: complete sample displacement and imbibition experiment and molecular dynamics modeling.

Research on equivalent numerical simulation method considering phase permeability lag and water seal gas effect: complete the research on equivalent numerical simulation method, the water film measurement experiment of water seal gas, and continue molecular dynamics calculation.

Research on technical policy of gas field development optimization based on big data analysis: complete big data analysis, screen out influencing factors of water breakthrough time, and give reasonable production allocation method.

Over the years, our company has carried out research on gas field water control development, and studied the production allocation theory of gas wells according to different geological conditions (fractures, bedrock, karst caves, etc.), different well completion methods (perforation, fracturing, etc.) and different positions and quantities of edge and bottom water of different gas fields; With the goal of gas field water control development and enhanced oil recovery, the research on basic theories and technical methods will have a good leading advantage in the development of large gas fields in China in the future.

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