Five-rock core joint measurement physical simulation device and fluid property identification method

Abstract

The invention discloses a five-rock-core simultaneous detection physical simulation device and a fluid property identification method. A five-rock-core simultaneous detection closed experimental device is applied to simulate slurry invasion under stratum conditions, and qualitative identification of fluid properties is performed according to oil-water layer rock core electrical resistivity changes and electrochemical potential changes when slurry invades into an oil-water layer. The experimental device comprises a slurry circulation module, multifunctional leak-off rock core clamps, a data collecting and processing system and a leak-off filtrate measuring system. According to the device, a complex stratum is formed by parallel connection simulation of five rock cores, the front ends of all the multifunctional leak-off rock core clamps are through, a simulation shaft is formed, and circulation flow of the slurry is simulated in the shaft. The slurry invasion experiment is performed through the five-rock-core simultaneous detection closed experimental device, the fluid properties are identified by a comparison of oil-water electrical resistivity and electrochemical potential differences in the slurry invasion process under different conditions, and a solid experimental basis is laid for reservoir fluid identification.

Description

technical field [0001] The invention relates to a physical simulation device for drilling mud invasion under simulated stratum conditions and a fluid qualitative identification method based on the experimental data of the device, belonging to the field of petroleum exploration and development. Background technique [0002] In the process of logging data processing and interpretation, using the measured formation resistivity parameters to identify oil and gas layers is one of the important contents of logging reservoir evaluation. However, during the drilling process, due to the invasion of mud and its filtrate to change the resistivity of the reservoir, coupled with the influence of well site engineering factors (such as pressure fluctuations in the well, shrinkage, etc.), the radius of the invasion zone is not constant, thus affecting The accuracy of reservoir logging evaluation, and as complex oil and gas reservoirs become the focus of research and exploration, the difficu...

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Problems solved by technology

However, during the drilling process, due to the invasion of mud and its filtrate to change the resistivity of the reservoir, coupled with the influence of well site engineering factors (such as pressure fluctuations in the well, shrinkage, etc.), the radius of the invasion zone is not constant, thus affecting The accuracy of reservoir logging evaluation, and as complex oil and gas reservoirs become the focus of research and exploration, the difficulties and contradictions in the identification of oil and water in complex reservoirs have become increasingly prominent. Solve the problem starting from the data. At present, oilfields at home and abroad basically start with geochemical logging, quantitative fluorescence logging, nuclear magnetic logging and other data to identify fluid properties, but the above methods have corresponding limitations.

[0003] When geochemical mud logging samples are in the form of blocks, rock pyrolysis mud logging has high reliability in the identification of oil, gas and water layers, but it is seriously flawed by drilling engineering constraints. Geochemical mud logging requires mud logging Cuttings are granular and have high requirements for the selection of rock samples; quantitative fluorescence logging technology can identify crude oil in formations and water in clastic formations well, but it is difficult to identify water in carbonate formations. Water has relatively high requirements on lithology; nuclear magnetic logging can identify oil and water in the formation very well, and realize quantitative interpretation of oil and water evaluation, but the cost of nuclear magnetic logging is too high to be popularized

[0004] In terms of drilling mud invasion, the current domestic and foreign plunger-shaped core mud invasion simulation devices can use long cores to study the change of radial resistivity during the invasion process, and help to establish the electric logging response mud invasion correction model, but the invasion process The actual situation of the formation is not considered, and the single permeability core test is applied without considering the process of simultaneous invasion of adjacent oil and water layers, and at the same time, the upper and lower surrounding rocks and interlayers are not considered

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