Gas foam-assisted steam drive thickened oil recovery simulation experiment device and method

Abstract

The invention discloses a gas foam-assisted steam drive thickened oil recovery simulation experiment device and method. The gas foam-assisted steam drive thickened oil recovery simulation experiment device comprises a model body, an injection device and a production device, wherein the model body comprises a lower box and an upper cover which can be arranged on the lower box in a covering mode, sand filling ports and an injection port which can be opened or closed are formed in the upper portion of the upper cover, a first vertical well, a second vertical well, a third vertical well, a fourth vertical well, a fifth vertical well, a sixth vertical well, a seventh vertical well and an eighth vertical well are arranged in the lower box; the injection device comprises a water injection device capable of communicating with the fifth vertical well, an oil injection device capable of communicating with the first vertical well and the injection port, a steam injection device capable of communicating with the first vertical well, and a foam injection device capable of communicating with the first vertical well; and the production device communicates with the second vertical well, the third vertical well and the fourth vertical well. By adoption of the gas foam-assisted steam drive thickened oil recovery simulation experiment device and method, the situation when a certain amount of gas foam is added in the steam drive process can be simulated accurately.

Description

technical field [0001] The invention relates to the field of laboratory experiments for petroleum development, in particular to a simulation experiment device and an experiment method for gas foam-assisted steam flooding recovery of heavy oil. Background technique [0002] Steam flooding is to continuously inject high-dryness steam into the oil layer from the injection well, and the steam continuously heats the oil layer, thereby greatly reducing the viscosity of the formation crude oil. The injected steam turns into hot fluid in the formation, drives the crude oil around the production well, and is extracted to the surface. [0003] The reserves suitable for steam flooding development in my country are 450 million tons. After nearly 30 years of development, the development of heavy oil steam injection reservoirs in Xinjiang and Liaohe has entered the middle and late stages. The development of steam flooding will lead to the invasion of edge and bottom water and the condensa...

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Problems solved by technology

[0003] The reserves suitable for steam flooding development in my country are 450 million tons. After nearly 30 years of development, the development of heavy oil steam injection reservoirs in Xinjiang and Liaohe has entered the middle and late stages. The development of steam flooding will lead to the invasion of edge and bottom water and the condensation of steam in thick oil layers. A large amount of water body accumulates, which increases the difficulty of development; secondly, the production of oil layers in the late stage of steam flooding is very uneven, the upper oil layer produces well, the lower oil layer produces poorly or is difficult to produce, and the invalid thermal cycle is serious; Uneven sweeping of steam flooding is common, steam channeling and overburden are serious, driving pressure drops sharply, oil well production drops sharply, production costs rise rapidly, and economic benefits deteriorate significantly. The survival of thermal recovery is facing great challenges, and it is urgent to find a more economical and effective steam flooding method to recover heavy oil in the middle and late stages, so as to provide strong technical support for the efficient development of heavy oil steam flooding and the sustainable and stable production

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