High-temperature high-pressure dry gas injection longitudinal wave and efficiency testing device and method for gas condensate reservoir

Abstract

The invention discloses high-temperature high-pressure dry gas injection longitudinal wave and efficiency testing device and method for a gas condensate reservoir. The device mainly comprises a high-pressure displacement pump, a medium container, a data acquiring system, a high-temperature and high-pressure slab model system, a backpressure controller, an oil-gas separator and a gas meter; the high-temperature and high-pressure slab model system mainly comprises a slab model, a model rack, a vertical lifting mechanism, a temperature control system, a fastening bolt, a fluid physical property testing point and a pressure sensor. The method comprises the steps of (1) manufacturing a sand filling model; (2) preparing a condensate gas sample and a formation water sample; (3) recovering the gas reservoir initial condition for the sand filling model; (4) injecting dry gas to replace condensate gas; (5) processing data, and calculating wave and efficiency. The device and method are reliable in principle, simple and convenient to operate, intuitive in measuring results, provide guidance suggestions to the condensate gas reservoir gas injection development effect and preparation of a development scheme, and have a wide application prospect.

Description

technical field [0001] The invention relates to a test device and method for longitudinal displacement sweep efficiency of dry gas injection in high temperature and high pressure condensate gas reservoirs in the field of petroleum and natural gas exploration and development. Background technique [0002] For condensate gas reservoirs with relatively high condensate oil content, the development method of circulating gas injection to maintain formation pressure is usually used to slow down the precipitation of condensate oil and increase the recovery of condensate oil. The recovery of condensate oil is mainly affected by the sweep efficiency of dry gas displacement, and the sweep efficiency directly determines the development effect of cyclic gas injection. At present, obvious gravity overriding phenomenon has been found in the dry gas circulation injection process of some condensate gas reservoirs, that is, in the process of horizontal flooding, a large amount of injected dry...

AI Technical Summary

Problems solved by technology

At present, obvious gravity overriding phenomenon has been found in the dry gas circulation injection process of some condensate gas reservoirs, that is, in the process of horizontal flooding, a large amount of injected dry gas rises beyond the condensate gas reservoir and accumulates at the top of the condensate gas reservoir, resulting in The phenomenon of gravity differentiation is obvious, but due to the limitations of technical equipment, it is impossible to physically simulate the phenomenon of gravity overriding, and commercial software cannot simulate this production phenomenon well, let alone explore and develop related theories

Images