Device and method for researching influence of coke deposition on reservoir physical properties

Abstract

The invention provides a device and method for researching the influence of coke deposition on reservoir physical properties. The device comprises a measurement system for detecting permeability and porosity distribution of a rock core before and after coking, a saturation system for oil saturation of the rock core, and a coking system for coking the rock core, wherein the coking system comprises an oxidation coking tank, a high-temperature pyrolysis coking tank and rock core cleaning equipment for cleaning coked rock cores. By measuring the change of rock core physical parameters such as permeability and porosity distribution before and after the rock core is coked, the rock core is studied from the microscopic and macroscopic double angles, and the influence of different coking modes, initial permeability of the rock core and the rock core composition on the coked rock core physical parameters is obtained. Compared with a traditional sand filling and combustion tube device, the device has advantages of being simple in structure, simple in experiment process, easy to operate, high in experiment accuracy, small in error and the like.

Description

technical field [0001] The invention belongs to the technical field of oil recovery, and in particular relates to a device and a method for studying the influence of coke deposition on the physical properties of reservoirs during the process of burning oil reservoirs. Background technique [0002] The world's heavy oil resources are very rich, and heavy oil resources are widely distributed in the world. There are more than 3.3 trillion barrels of heavy oil and 5.5 trillion barrels of asphalt resources in the world. The exploitation of heavy oil began in the 1960s. After decades of development, the exploitation technology of heavy oil has made rapid progress. So far, the development of heavy oil is mainly carried out in the way of heavy oil thermal recovery technology (including burning oil layer, steam huff and puff, steam flooding, etc.) and cold recovery (chemical flooding). Thermal oil recovery is currently the most important method for developing heavy oil reservoirs. C...

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Problems solved by technology

In addition, coke deposition will also lead to changes in the thermal conductivity of the matrix, which will affect the thermal conductivity of the combustion front and the formation.

[0005] At present, physical model experiments are mainly used at home and abroad to study the influence of coke in incineration oil layers on the porosity and permeability characteristics of reservoirs. Due to the complexity of coking reactions in fire flooding, coke caused by different coking methods cannot be clarified in physical models. The impact of sedimentation on reservoir physical properties cannot quantitatively describe the impact of different coking methods on reservoir porosity and permeability characteristics and seepage capacity

[0006] At present, there is no mature and perfect experimental method and processing device in China that can systematically study the influence of coke deposition on reservoir properties under oil reservoir conditions. With the help of traditional sand filling and Combustion tube device to study the effect of coking crude oil on the porosity and permeability characteristics of the physical simulation device

However, there are some deficiencies in this method: 1) the fire flooding experiment is used, the experimental process is more complicated, there are many uncontrollable factors, the coking reaction is affected by many factors, and the experimental error is relatively large; The influence of physical properties is mostly a qualitative description, and it is impossible to clarify the influence of different coke formation methods on the porosity and permeability characteristics of the reservoir, so the experimental results are not good and the experimental results are inaccurate; 3) coke is deposited in the reservoir after the experiment. Further clarify its distribution characteristics from a microscopic point of view, so the experimental analysis is not comprehensive

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