Core experimental simulation method and device for edge-bottom water reservoir exploitation

Abstract

The invention discloses a core experimental simulation method and a core experimental simulation device for edge-bottom water reservoir exploitation. The method comprises the following steps: acquiring basic parameters of a target edge-bottom water reservoir; acquiring a core group according to the distribution rule of the reservoir; performing a core stratum water volume coefficient measurement experiment on the core group to measure a stratum water volume coefficient; performing a core water saturation experiment on the core group to measure a pore volume; determining the volume of a water body of fixed-volume edge-bottom water subjected to experimental simulation at normal temperature and normal pressure according to the pore volume, a ratio of the scale of the water body to the pore volume of the reservoir and the stratum water volume coefficient based on a first preset relation; lowering the pressure on the outlet end of the core group at a preset pressure drop speed, and recording the yields of oil, gas and water and the change of water pressure in a pressure lowering process. The core experimental simulation method and the core experimental simulation device can really simulate the exploitation of the edge-bottom water reservoir.

Description

technical field [0001] The invention relates to the technical field of petroleum development experiments, in particular to a method and device for simulating core experiments of edge and bottom water reservoir development. Background technique [0002] Edge and bottom water reservoirs are widely distributed in major oil regions in the world. There are huge edge and bottom water reservoirs in oilfields such as Shengli and North my country in the east of China, and Xinjiang in the west of China. Rational and efficient development of edge and bottom water reservoirs is an important guarantee for long-term stable and high domestic oil production. [0003] Reservoirs with edge and bottom water have special oil-water relationship, including edge water reservoirs and bottom water reservoirs. Among them, edge-water reservoirs are generally layered, and the oil-bearing zone and water body only contact in the reservoir at the edge of the reservoir, which can be simply expressed as po...

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Problems solved by technology

However, due to the significant reduction of pressure around the bottom of the production well, the edge and bottom water tends to break through the oil-water front near the bottom of the well, forming a water tongue or a water cone, so that the water breakthrough time of the oil well is shortened, and the water cut is increased. Accelerated, reduced oil production, lower recovery degree, seriously affecting the development effect of the reservoir

[0005] At present, the research methods for the development characteristics of edge-bottom water reservoirs are mainly numerical calculation methods, which have certain guiding significance for the determination of the development technical boundaries and development methods of edge-bottom water reservoirs, but there are a series of defects and deficiencies at the same time, such as The above research methods ignore many important influencing factors in the calculation process, and there are large calculation errors, which cannot truly simulate the development of edge and bottom water reservoirs.

Therefore, numerical calculation methods can no longer meet the needs of precise development research of edge and bottom water reservoirs to a large extent.

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