Device and method for thickened oil deposit gas injection huff-puff oil extraction physical simulation experiments

Abstract

The invention discloses a device and method for thickened oil deposit gas injection huff-puff oil extraction physical simulation experiments. The device comprises an injection system, a model system, an output control system and a data collection and control system, wherein the injection system is connected with the model system so as to inject formation water, crude oil and huff-puff gas into the model system, the outlet end of the model system is connected with the output control system, the output control system is used for controlling the output of oil-gas mixtures of the model system and calculating gas flow and oil production in the outputted oil-gas mixtures, the model system is further connected with the data collection and control system, and the data collection and control system is used for collecting pressure, temperature and huff-puff gas flow data in a model body and monitoring and processing data in real time. The device can be used for truly simulating processes of injecting gas into a stratum, soaking and extracting indoors and monitoring pressure and pressure gradient distribution rules of different positions from the well bottom of a gas injection well to the far end of the stratum in gas injection and extraction simulation processes.

Description

technical field [0001] The invention belongs to the field of petroleum development, and in particular relates to an experimental device and method for simulating the gas injection huff and puff oil production process of heavy oil reservoirs. Background technique [0002] In the field of petroleum development, gas injection huff and puff oil production refers to inject huff and puff gas (natural gas, carbon dioxide, etc.) The ground is in contact with the formation crude oil and dissolves to reach saturation, which is called the swallowing process; after the immersion period is over, the well is opened for production, and due to the dissolved gas drive and the expansion of the crude oil, the gas staying in the formation mixes with the expanded crude oil and flows out of the wellhead , to complete the spraying process. [0003] At present, China's heavy oil development methods mainly include steam stimulation (about 78%), steam flooding (about 10%) and conventional water floo...

AI Technical Summary

Problems solved by technology

However, it still has the following deficiencies in the study of reservoir gas injection huff and puff mechanism: 1) The scale of the model is small, especially the one-dimensional length is not enough, so it cannot simulate the entire formation elasticity from the gas injection well to the gas injection well (production well); 2) ) The huff-and-puff period that can be performed is small, and the degree of periodic recovery is high, which is inconsistent with the actual production on site; 3) There are no pressure measurement points along the model, so it is impossible to study the law of energy transfer and transfer during the gas injection huff-and-puff process

However, the existing experimental devices still have the following deficiencies for the research on the gas injection mechanism of reservoirs: 1) The one-dimensional length of the model is not enough to simulate the entire formation elasticity from the gas injection well to the gas injection well (oil production well); 2) It cannot Monitoring the pressure changes in different parts of the model makes it impossible to study the law of energy transfer and transfer during gas injection huff and puff

However, there are still the following deficiencies in the existing experimental devices for the research on the mechanism of reservoir gas injection huff and puff: 1) There is no pressure monitoring system along the model, which cannot truly reflect the changes in reservoir pressure gradient and gas injection during the process of gas injection and recovery. The law of energy transfer and transfer during the process of huff and puff; 2) The single-tube model can have fewer huff and puff cycles and a higher degree of periodic recovery, which is inconsistent with the actual production on site; 3) Multiple core tube models are connected by thin pipelines, which is consistent with The actual formation seepage situation does not match

Images