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Reverse imbibition recovery factor prediction method for fractured reservoirs

A prediction method and technology of recovery rate, applied in the field of matrix rock blocks and prediction of reverse imbibition recovery rate of fractured reservoirs, can solve problems such as inaccurate results

Active Publication Date: 2017-10-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

[0011] The present invention aims at the inaccurate results of the existing fractured oil reservoirs when predicting reverse imbibition recovery, etc., and provides a method for predicting reverse imbibition recovery in fractured oil reservoirs. The method considers isolated fractures and matrix rocks According to the irregularity of block cutting and the diversity of contact between fractures and matrix, the imbibition process and law of fractured reservoirs are comprehensively simulated, and the change of remaining oil in fractured media under the action of imbibition is studied and predicted. Accurate characterization, able to simulate the influence of isolated fractures, and the prediction results are accurate

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  • Reverse imbibition recovery factor prediction method for fractured reservoirs
  • Reverse imbibition recovery factor prediction method for fractured reservoirs
  • Reverse imbibition recovery factor prediction method for fractured reservoirs

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Embodiment 1

[0073] Embodiment 1: A method for predicting reverse imbibition recovery in fractured reservoirs, comprising the following steps:

[0074] Step 1: Considering the irregularity of fractures cutting matrix blocks, the diversity of contact between fractures and matrix, and the isolated fractures in matrix, a fractured medium model is established, such as figure 1 As shown, the fractured medium model is composed of edge fractures of irregular pentagonal rock blocks connected end to end after the matrix rock block is cut. The specific steps are:

[0075] (1) Collect core, seismic, and imaging logging data that reflect the development of fractures;

[0076] (2) According to the core statistical results, seismic prediction results, and imaging logging detection results, the statistics of fracture development status, fracture development density, fracture length, fracture opening, and fracture dip angle are obtained to obtain connectivity information of large-scale fracture networks,...

Embodiment 2

[0121] Embodiment 2: Different from Embodiment 1, a method for predicting reverse imbibition recovery of fractured reservoirs provided in Embodiment 2, establishes a fractured medium model in Step 1 such as Figure 4 As shown in , the fractured medium model is composed of end-to-end connection of the edge fractures of the rectangular rock block after the matrix rock block is cut; the discrete model obtained in step 2 is as follows: Figure 5 . All the other steps are the same as in Embodiment 1.

[0122] The method for predicting the recovery factor of imbibition of the present invention is to numerically simulate the process of imbibition in a matrix, and predict the change of saturation and the change of recovery factor under the effect of imbibition.

[0123] Depend on Image 6 It can be seen that the accuracy and effectiveness of the present invention are better than the experimental results of the numerical simulation data of the present invention and the experimental r...

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Abstract

The invention relates to a fractured reservoir reverse imbibition recovery prediction method. The method is characterized by, establishing a fractured medium model with isolated cracks, irregularity of matrix block cutting and diversity of contact between the cracks and matrixes being taken into consideration; and carrying out imbibition process and rule numerical simulation of the fractured medium model based on a numerical simulation method of a discrete crack model and coupling between the cracks and matrixes, and predicating recovery change. The method realizes comprehensive simulation of imbibition process and rules of fractured reservoir, studies change of remaining oil in the fractured medium under the function of imbibition predication, realizes precise description of the cracks, can simulate influence of the isolated cracks, is accurate in predication result, and meets the defects of a conventional numerical simulation method.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a method for predicting reverse imbibition recovery of fractured oil reservoirs, especially for matrix rock blocks with isolated fractures. Background technique [0002] Crude oil recovery in fractured reservoirs is low, water breakthrough is early, and it is difficult to displace crude oil in the matrix. For fractured oil reservoirs, especially low-permeability oil reservoirs, usually after high water cut is found, the wells are shut down for a period of time before production, relying on capillary force, that is, imbibition, to displace the crude oil inside the matrix. The study of the length of borehole time and the change of recovery rate under imbibition is of great significance to improve the recovery rate of fractured reservoirs. [0003] There are three main methods for predicting the recovery of imbibition within the matrix: laboratory experim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V9/00G01V99/00
CPCG01V9/00G01V99/005
Inventor 王月英姚军吕爱民王浩瑄
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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