Method for analyzing remaining oil distribution of fractured-vuggy reservoir

A technology of fracture-cavity type and analysis of fractures, which is applied in the field of oil and gas field development and the research field of fracture-cavity type oil reservoirs, and can solve the problems that it cannot be well applied to the complex flow of multiphase fluids.

Active Publication Date: 2012-02-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

Although some triple-pore or triple-media models have been proposed [Closemann, 1975; Abdassah and Ershaghis, 1986; Bai et al.1993],

Method used

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  • Method for analyzing remaining oil distribution of fractured-vuggy reservoir
  • Method for analyzing remaining oil distribution of fractured-vuggy reservoir
  • Method for analyzing remaining oil distribution of fractured-vuggy reservoir

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Embodiment Construction

[0120] figure 1It is a schematic diagram of the complex medium model in the present invention. Divide the complex medium area into several spatial unit blocks; establish a V-F-M model based on the three units of cave, fracture and matrix for each unit block, that is, the cave-fracture-matrix model; the flow of multiphase fluid in complex media includes The flow between the units in the block and the flow between the units in the block; the flow of the fluid between the units is seepage flow, pipe flow or parallel interwall laminar flow, Darcy flow or non-Darcy flow multiphase flow. The figure shows that each mesh after subdivision is composed of bedrock, cracks and caves.

[0121] figure 2 is a schematic diagram of interunit flow using the finite volume method in the present invention. The flow of multiphase fluid in a complex medium includes the flow of multiphase fluid between units in a block and the flow of multiphase fluid between units in a block, and these two parts...

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Abstract

The invention provides a method for analyzing remaining oil distribution of a fractured-vuggy reservoir, belonging to the fields of numerical reservoir simulation and oil-gas field development. In the method, a complex medium consisting of a cave medium, a crack medium and a pore medium is partitioned into a plurality of space unit blocks in a space field; each block consists of V, F and M units which represent a cave, a crack and a substrate in the block respectively and constitute a V-F-M model; the flow of a multi-phase fluid in the complex medium is described by the motion of a fluid among the units in each block and the motion of a fluid among the units of different blocks; and the flow of the fluid among the units can be considered as infiltration flow, pipe flow or laminar flow between parallel walls, Darcy flow or non-Darcy flow. According to the method, scientific description and accurate numerical simulation of the fractured-vuggy reservoir are realized, and technical foundations are laid for the alignment of the remaining oil distribution position of the fractured-vuggy reservoir with a numerical simulation technology, quantitative determination of the reserves abundance of the reservoir, scientific and reasonable development of oil fields provided with the reservoir and final increase in the recovery ratio.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, in particular to the research field of fracture-cavity oil reservoirs. Specifically, it relates to a method for analyzing the distribution of remaining oil in a fractured-vuggy reservoir. Background technique [0002] Since the 1960s, Barenblatt et al. have made great progress in the numerical simulation of fractured reservoirs. For the dual medium theory based on pores and fractures, Warren and Root proposed the Warren-Root model composed of orthogonal fracture networks to divide the bedrock in 1963, Kazemi proposed the Kazemi model composed of horizontal fractures and horizontal bedrock layers in 1969, and Pruess in 1985 and Narasimhan proposed the MINC model by finely dividing matrix blocks to describe the pressure gradient between fractures and matrix. The dual-media model is a commonly used reservoir numerical simulation method at present. This medium is composed of rock blocks...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 康志江邸元赵艳艳张允崔书岳
Owner CHINA PETROLEUM & CHEM CORP
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