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Low-permeability gas reservoir dynamic reserves evaluation method

A technology of dynamic reserves and evaluation methods, which is applied in earthwork drilling, special data processing applications, instruments, etc., and can solve problems such as long-time shut-in tests and inconvenient field applications

Inactive Publication Date: 2018-11-13
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

The field construction of the gas field shows that the application of these conventional reserve calculation methods in low-permeability gas reservoirs needs to adapt to relatively severe conditions, or require complex corrections and long-term well shut-in tests, which brings challenges to field applications. many inconveniences

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  • Low-permeability gas reservoir dynamic reserves evaluation method
  • Low-permeability gas reservoir dynamic reserves evaluation method
  • Low-permeability gas reservoir dynamic reserves evaluation method

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with accompanying drawing:

[0044] The method of the present invention is programmed by the VBA development tool in excel, after the original production data of the gas reservoir is processed according to the following steps, the production data of the low-permeability gas reservoir is fitted by the program, and the required accuracy of fitting is reached through repeated trial calculations , to obtain the dynamic reserves of the gas well. Its operation steps are as figure 1 The block diagram shows:

[0045] Step 1: Calculate the pseudo-pressure of the original formation m(p i );

[0046] Step 2: Calculate the pseudo pressure m(p wf );

[0047] Step 3: Calculate the natural gas physical parameter z i , c g and the interpolation table of m(p) changing with pressure;

[0048] Step 4: Assuming the original geological reserves G of the gas reservoir, according to the production data and original...

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Abstract

The invention provides a low-permeability gas reservoir dynamic reserves evaluation method, and belongs to the field of the low-permeability gas reservoir dynamic reserves evaluation method. The gas well dynamic reserves is the important evidence for gas well reasonable production allocation and development scheme customization. Since the low-permeability gas reservoir stratum is bad, and the suitable condition of the dynamic reserves computation method of the traditional pressure drop method and pressure recovery well testing method is harsh, and needs the complex correction. By improving thesubstance balance method reserves computation way, a harmonic decline curve model is imported, and a relation curve of a gas productivity index to fitting time is drawn on the double-logarithm coordinate so as to be fit with the harmonic decline curve on the Fetkovich plate, thereby establishing a fitting point, and solving the stratum parameter in the premise of not performing the full gas-reservoir shut-in. The advantage of the computation method is that the gas well does not to perform the shut-in manometry, the reservoir computation can be directly performed by directly applying the gas well production data without influencing the gas well production, and the method has extensive practicability.

Description

technical field [0001] The invention belongs to the field of evaluating the dynamic reserves of low-permeability gas reservoirs in the development of oil and gas fields, and specifically relates to a method for evaluating the dynamic reserves of low-permeability gas reservoirs, which provides effective guidance for calculating the dynamic reserves of low-permeability gas reservoirs. Background technique [0002] The dynamic reserves of gas reservoirs refer to the geological reserves of reservoir gases involved in seepage. Gas reservoirs in different stages of exploration and development have different reserves calculation methods due to different degrees of understanding of gas reservoirs. At present, there are mainly two methods for calculating reserves, volumetric method and dynamic method. The volumetric method is the most commonly used reserve calculation method with a wide range of applications. It regards the gas reservoir as a regular container to calculate reserves,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50E21B49/00
CPCE21B49/00G06F30/20
Inventor 马明伟梅海燕杨龙毛恒博张茂林杨成亮
Owner SOUTHWEST PETROLEUM UNIV
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