Permeability testing method for gas-cap reservoir development
A technology for gas-cap oil reservoirs and testing methods, which is applied in the fields of fluid production, measurement, and earth-moving drilling and production, can solve problems such as systematic considerations in the development process of gas-cap oil reservoirs, and saves experiment time, cost, and data continuity. Effect
Inactive Publication Date: 2020-06-05
SOUTHWEST PETROLEUM UNIV
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[0004] The current phase permeability test is mainly designed based on one displacement method, mainly including water flooding oil, gas flooding oil, gas flooding water, water flooding gas, etc., without systematic consideration for the development process of gas cap reservoirs. The relative permeability test in the development mode and stage can reproduce the seepage law in the development process, which has important guiding significance for the development of gas cap reservoirs
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[0053] Further illustrate the present invention according to accompanying drawing below.
[0054] The gas cap reservoir development seepage test method includes the following steps:
[0055] (1) Obtain the separator oil sample and separator gas sample under the current production conditions of a certain gas cap oil reservoir, and obtain the oil sample viscosity μ o =0.16mp.s, and then prepare simulated oil samples according to this viscosity.
[0056] (2) Obtain the salinity of the formation water (26885mg / L) according to the analysis report of the formation water on site, prepare the formation water according to the salinity, and obtain the viscosity of the formation water as μ w =0.67mp.s, the density is ρ=1.016g / cm 3 , the experimental gas sample is nitrogen, the viscosity is μ g = 0.01758 mp.s.
[0057] (3) Obtain the plunger rock core that meets the experimental requirements, measure and obtain the core length L=5.0cm, cross-sectional area A=4.91cm 2 , volume V=24.54...
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The invention relates to a permeability testing method for gas-cap reservoir development. The method comprises the following steps that simulation oil and formation water are prepared, and an experiment adopts nitrogen; core length L, cross-sectional area A, volume V, and porosity gas permeability K are acquired; the permeability testing mode of oil extraction before gas production is adopted, theprocess comprises the following steps that (1) oil displaces water to establish irreducible water saturation, gas displacement oil relative permeability testing is carried out, and a relation curve of the oil phase relative permeability K<ro> of a core, the gas phase relative permeability K<rg> of the core and the gas saturation S<g> is made; (2) the core is not taken out, oil displacement gas relative permeability testing is carried out, and a relation curve of the gas phase relative permeability K<rg> of the core, the oil phase relative permeability K<ro> of the core and the oil saturationS<o> is made; (3) the core is not taken out, water displacement oil + residual gas relative permeability testing is carried out, and a relation curve of the oil phase relative permeability K<ro> of the core, the water phase relative permeability K<rw> of the core and the water saturation S<w> is made; and the permeability testing mode of gas production before oil extraction can further be adopted.The permeability testing method for the gas-cap reservoir development can accurately evaluate the three-phase flow condition and the permeability rule of oil, gas, and water under the real reservoircondition, and has a wide market prospect.
Description
technical field [0001] The invention relates to a test method for seepage of oil, gas and water three-phase in underground porous media in different development modes of gas-cap reservoirs in the field of petroleum and natural gas exploration and development, and belongs to the technical field of enhanced oil recovery. Background technique [0002] Gas cap reservoir is a special and important reservoir type. In recent years, a series of gas-cap reservoirs have been discovered in my country, and their reserves are quite abundant. There are three main development methods for gas cap reservoirs, including oil production first and then gas production, gas production first and then oil production, and simultaneous oil and gas production (Liu Qian. Research on development strategies for heavy oil reservoirs with gas cap and edge water[J]. Petrochemical Technology, 2019, 26(05):86-87). Different development methods have corresponding displacement processes. For example, oil recov...
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IPC IPC(8): E21B43/16E21B43/20E21B47/06E21B47/00G06Q50/02
CPCE21B43/166E21B43/20E21B47/00E21B47/06G06Q50/02
Inventor 郭平李鑫汪周华胡义升刘煌王烁石
Owner SOUTHWEST PETROLEUM UNIV