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Dynamic analysis method and system of fracture-vug type carbonatite gas reservoir

A carbonate rock, fracture-cavity technology, applied in special data processing applications, instruments, electrical digital data processing, etc., to achieve the effect of improving utilization

Active Publication Date: 2013-11-27
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, a lot of experience shows that no production data analysis method is suitable for all types of gas reservoirs, comprehensive application of various analysis methods and full use of flow pressure data is the best way to reduce analysis errors
[0004] In conclusion, the various methods currently used for dynamic analysis of carbonate rocks have limitations, and there is no relevant discussion on the dynamic description of fractured-cavity carbonate gas reservoirs with comprehensive well testing and modern production decline analysis methods

Method used

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  • Dynamic analysis method and system of fracture-vug type carbonatite gas reservoir
  • Dynamic analysis method and system of fracture-vug type carbonatite gas reservoir
  • Dynamic analysis method and system of fracture-vug type carbonatite gas reservoir

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Experimental program
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Embodiment 1

[0059] Such as figure 1 As shown, it is a flow chart of a dynamic analysis method for a fractured-cavity carbonate gas reservoir in this embodiment, which specifically includes the following steps:

[0060] Step 101, obtaining short-term well test data, gas well flow pressure gradient value, and long-term dynamic pressure data and long-term dynamic flow data recorded in long-term production;

[0061] Wherein, the above-mentioned data obtained are all basic data, and other basic data will also be obtained at the same time.

[0062] Basic data includes:

[0063] 1) Basic parameters

[0064] Reservoir properties: porosity φ, effective thickness h, rock compression coefficient C f , comprehensive compression factor C t

[0065] Physical properties of natural gas: natural gas specific gravity γ, volume coefficient B g , compression factor C g

[0066] 2) Completion parameters

[0067] Well type: vertical well, horizontal well

[0068] Layer: perforation layer

[0069] We...

Embodiment 2

[0113] Such as figure 2 As shown, it is a structural diagram of a dynamic analysis system for a fractured-cavity carbonate gas reservoir of the present invention, including:

[0114] The data acquisition unit 201 is used to acquire short-term well test data, wellbore pressure gradient data, and long-term dynamic pressure data and long-term dynamic flow data recorded in long-term production;

[0115] A bottomhole flow pressure calculation unit 202, configured to calculate long-term dynamic bottomhole flow pressure data according to the long-term dynamic pressure data, long-term dynamic flow data and the wellbore gradient data;

[0116] A data connection unit 203, configured to connect the long-term dynamic bottomhole flowing pressure data with the short-term well test data to obtain dynamic analysis data of fractured-cavity carbonate gas reservoirs;

[0117] Using the short-term well test data within the time range recorded in the short-term well test data;

[0118] In the t...

Embodiment 3

[0134] Such as image 3 Shown is the flow chart of the well testing analysis method for homogeneous gas reservoirs:

[0135] Step 301, taking pressure instability data according to the well test design;

[0136] Step 302, performing double-logarithmic analysis on the pressure instability data with well testing software; the initial data mainly includes:

[0137] Pressure data, flow data.

[0138] The basic principle and calculation process of chart fitting are as follows: In the part of dimensionless physical quantity, we defined dimensionless pressure and dimensionless time respectively. If the logarithms of the two dimensionless parameters are respectively taken,

[0139] lgt D = lgΔt + lg α t K φμ C t r w ...

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Abstract

The invention provides a dynamic analysis method and system of a fracture-vug type carbonatite gas reservoir. Long-term production dynamic data and short-term well test data are combined to form complete production history data, so that the problem of multiple solutions of description of gas reservoir can be effectively solved, and the utilization rate of well test data is improved. Meanwhile, various critical problems about single-well gas deliverability, stable yield conditions, controlled active area and dynamic reserve volume of a single-well as well as parameters of strata permeability and the like in gas field development can be excellently solved by virtue of means such as analysis of well test, analysis of modern production decline and the like on the basis of the production history data.

Description

technical field [0001] The invention relates to the technical field of dynamic analysis of oil and gas fields, in particular to a dynamic analysis method and system for fracture-cave carbonate gas reservoirs. Background technique [0002] Gas reservoir dynamic description is to process and interpret the response of dynamic data such as pressure and production recorded during gas well testing and production. Transient Analysis-RTA), especially the latest development of numerical well testing analysis methods and technologies, combined with static information to make a new interpretation of the gas well's formation conditions to obtain gas reservoir or gas well parameters. [0003] In the past nearly 50 years, people have conducted extensive research on the unstable well testing problem of fractured-cavity carbonate reservoirs. On the basis of unstable well testing theory and traditional production decline analysis techniques, modern production decline analysis methods based ...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 孙贺东邓兴梁韩永新施英徐艳梅曹雯舍志成路琳琳
Owner PETROCHINA CO LTD
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