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随着技术的进步、能源价格的提高以及常规气藏储量的下降,油气公司开始开发致密(低渗透)气藏中大储量圈闭的可行性。对这些低渗透气层进行常规试井所获得的重要油藏参数通常都会有偏差,例如原始油藏压力、渗透率、有效裂缝长度、裂缝导流能力和产能。本文的目的是评价应用于不同类型致密气层的特殊测试方法,讨论传统的测试方法很少成功的原因,并找到适合于致密气藏的测试和分析方法。我们将考虑短时测试,主要是为了获得原始气藏压力,其次是确定渗透率和表皮系数。将考虑流入动态测试、裂缝校正测试和地层流动测试,并通过实验和现场实例对这些测试的应用性进行了展示。
As technology advances, energy prices rise, and declines in conventional gas reserves, oil and gas companies are starting to develop the viability of large reserves in tight (low-permeability) gas reservoirs. Typical reservoir parameters obtained from conventional well tests on these low-permeability gas layers generally deviate, such as primary reservoir pressure, permeability, effective fracture length, fracture conductivity, and productivity. The purpose of this paper is to evaluate specific test methods applied to different types of tight gas reservoirs, to discuss the reasons why traditional test methods are rarely successful, and to find suitable test and analysis methods for tight gas reservoirs. We will consider the short-term test, mainly to obtain the original reservoir pressure, followed by the determination of permeability and skin factor. The inflow dynamic test, crack correction test and formation flow test will be considered and the applicability of these tests will be demonstrated through experiments and field examples.