摘要
产能评价是气田开发的核心工作，气井绝对无阻流量是反映气井潜在产能的重要指标。在四川盆地重点海相碳酸盐岩气藏开发实践的基础上，文中综合研究了气井产能的科学内涵及产能评价核心技术，提出了以“有没有，通不通，定不定”为技术体系的产能评价理念，即动态储量有没有？流动能力怎么样？流动是否稳定？而产能评价核心技术包括绝对无阻流量的计算、绝对无阻流量随时间的变化规律、绝对无阻流量的关键指标构成及影响因素。在此基础上，进一步探讨了气藏产能评价的现状和主要矛盾，如在水侵、井间干扰、储层低渗和强非均质性等因素的影响下，对气井压力、泄气半径及渗透率等参数随时间的变化规律认识不清楚。研究成果可以用于简化和解决复杂地质条件下的气井产能评价问题，为四川盆地重点海相碳酸盐岩气藏科学开发提供技术支撑。
Abstract
Productivity evaluation is the core work of gas field development, and the absolute open flow is an important index to reflect the potential productivity of gas wells. Based on the development practice of key marine carbonate gas reservoirs in Sichuan Basin, the scientific connotation of gas well productivity and the core technology of productivity evaluation are comprehensively studied. This paper puts forward the productivity evaluation concept of "having or not, flowing or not, stable or not" as the technical system, that is, whether there are dynamic reserves? how about the flow capacity? and whether the flow is stable? The core technology of capacity evaluation includes: absolute open flow calculation, the variation law of absolute open flow with time, and the key indicators and influencing factors of absolute open flow. On this basis, this paper discusses the current situation and main contradictions of productivity evaluation of gas reservoirs. For example, under the influence of water invasion, inter well interference, low permeability and strong heterogeneity, the variation law of gas well pressure, gas release radius and permeability with time is not clear. It is expected to simplify and solve the problem of gas well productivity evaluation under complex geological conditions, and provide technical support for the scientific development of key marine carbonate gas reservoirs in the Sichuan Basin.
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