Conglomerate full-diameter rock core radial flow oil-water relative permeability measuring device and method

Abstract

The invention discloses a conglomerate full-diameter rock core radial flow oil-water relative permeability measuring device and method. According to a conglomerate full-diameter rock core radial flowoil-water relative permeability measuring experimental device, an experimental process and an experimental data processing method, the radial seepage process of the oil and water near a wellbore underthe formation temperature and pressure can be accurately simulated, and the radial seepage oil and water relative permeability of the conglomerate full-diameter rock core is measured. The experimental device comprises a vacuumizing system, a pressure supply system, a simulated reservoir module and a produced liquid metering system. The experimental process comprises the following steps of full-diameter rock core pretreatment, rock core absolute permeability determination, rock core vacuumizing and water saturation, an oil displacement water method rock core saturated oil experiment and the water displacement oil unsteady state method oil-water relative permeability measurement experiment. The data processing method is a full-diameter rock core radial flow oil-water relative permeability curve calculation method derived on the basis of a Darcy formula, a B-L radial seepage equation, a flow function G and the like.

Description

technical field [0001] The invention belongs to the technical field of measuring the oil-water two-phase relative permeability of conglomerate reservoir cores, and includes a device and method for measuring the radial flow oil-water relative permeability of conglomerate full-diameter cores. Background technique [0002] The oil-water two-phase relative permeability is one of the basic parameters for oil and gas field development. It has important guiding significance for formulating reservoir development plans and understanding the seepage of oil and water in reservoirs, and it is a parameter that must be measured. At present, the measurement of oil-water relative permeability of cores is mainly for sandstone cores, and the cores used for measurement are mostly core columns with a diameter of 2.5 cm, and the measured flow is mainly one-dimensional linear flow. The diameter of the core holder commonly used in domestic and foreign experiments is 2.5 cm. The advantage is that i...

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Problems solved by technology

[0003] (1) Due to the small size of the core, the three-dimensional radial seepage process of the formation near the actual wellbore cannot be simulated, which affects the use of test results

[0004] (2) The particle size of conglomerate cores varies greatly, and the representativeness of small cores is poor. It is difficult to obtain suitable representative cores with conventional core holders, and the availability of test results is poor

[0005] (3) The amount of saturated oil in the conventional core is small, and the measurement error is large, and the plane displacement equation is usually used to process the experimental data, so the actual applicability of the relative permeability curve obtained by the final calculation is poor

[0006] (4) Conventional relative permeability tests are based on small cores and one-dimensional linear steady seepage, but the calculation and data processing methods for two-phase radial seepage relative permeability are not yet mature

[0007] It can be seen that the permeability test on standard small cores cannot meet the needs of conglomerate core relative permeability testing and oilfield production. It is necessary to develop a full-diameter core holder for conglomerate and its supporting equipment, and it is necessary to improve the conglomerate oil-water Processing Method of Test Data of Radial Flow Two-phase Relative Permeability

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