Multi-layer commingling production physical simulation system for natural gas reservoirs

Abstract

The invention relates to a multi-layer commingling production physical simulation system for natural gas reservoirs. The multi-layer commingling production physical simulation system for the natural gas reservoirs comprises seven subsystems, namely, a injection system, a core clamping system, a confining-pressure system, a back-pressure system, a pressure acquisition system, a flow control and acquisition system and a temperature control system. The injection system includes high-pressure gas source, a middle container and a high-precision plunger pump. The core clamping system consists of three sets of long-core clamping holders. The confining-pressure system is composed of three sets of plunger pumps. The back-pressure system includes a high-precision back-pressure valve and a plunger pump. The pressure acquisition system includes a pressure sensor and a computer. The flow control and acquisition system includes a flow sensor, a flow controller and a computer. The temperature controlsystem is a constant temperature box. The multi-layer commingling production physical simulation system for the natural gas reservoirs can simulate the multi-layer commingling production process of different driving types of natural gas reservoirs in different development modes under real reservoir conditions, and is used for studying the seepage law and development characteristics of multi-layercommingling production of the natural gas reservoirs.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development simulation experiments in the petroleum industry, and in particular relates to a physical simulation system for multi-layer co-production of natural gas reservoirs. Background technique [0002] Indoor physical simulation experiments are the main means to study the seepage mechanism and seepage characteristics of oil and gas reservoirs. For gas reservoirs, especially low-permeability and tight gas reservoirs, due to the poor physical properties of the reservoirs and the limited gas supply capacity of a single layer, vertical wells are used for single-layer development. Cost-effective development is often not possible. In view of the above problems, the existing technology often develops natural gas reservoirs through vertical well multi-layer commingled production or horizontal well single-layer production. Among them, since the vertical well multi-layer commingled production...

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Problems solved by technology

At present, a considerable part of physical simulation studies use artificial core models (including sand-packed pipe models, flat plate models, glass etching models, etc.) However, the pore-throat distribution characteristics and wettability characteristics are quite different from those of real reservoirs. At the same time, such models are difficult to withstand high pressure and cannot simulate the real pressure of reservoirs. Therefore, there are large errors between the research results and the real situation.

[0004] A small number of studies have used natural cores. By simulating the multi-layer commingled production process of the reservoir in parallel with the core holders, such cores can more realistically simulate the actual situation of the reservoir and withstand high pressure. However, the current experimental methods and equipment can only A relatively high pressure is applied at the inlet of the core, and the outlet is still placed under normal pressure or an additional pressure regulating valve is used. The core system cannot simulate the real high pressure of the reservoir, nor can it meet the different development methods of the simulated gas reservoir (constant pressure production). , fixed output mining) needs

In addition, in the process of multi-layer combined production of reservoirs, the driving types of each reservoir may be different, and the current physical simulation method can only simulate the depletion and development of each reservoir, and cannot simulate other driving modes of the reservoir (elastic water flooding etc.), such as the multi-layer co-production production capacity simulation experiment device mentioned in a Chinese patent with the publication number CN106640060A and titled "Natural Gas Reservoir Multi-layer Co-production Production Simulation Experimental Method"

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