Method for calculating geological sweetness and engineering sweetness of shale gas

A sweetness calculation and shale gas technology, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problem that the degree of sweet spot is not further defined, the calculation method of geological sweet spot and engineering sweet spot weight needs to be improved, and there is no search Geological sweet spot and engineering sweet spot weight distribution and other issues to achieve the effect of avoiding technical risks

Active Publication Date: 2017-10-24
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0004] 2) The degree of the sweet spot is not further defined, and the correlation between the size of the sweet spot value and the yield after pressing is not strong
[0005] 3) The weight calculation method of geological sweet spot and engineering sweet spot needs to be improved
In the past, equal weight distribution was mostly used to calculate the total sweet spot index, but the weight distribution of geological sweet spot and engineering sweet spot was not sought from the correlation of post-fracture production

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  • Method for calculating geological sweetness and engineering sweetness of shale gas
  • Method for calculating geological sweetness and engineering sweetness of shale gas
  • Method for calculating geological sweetness and engineering sweetness of shale gas

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[0054] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0055] figure 1 It is a flow chart of the calculation method provided by the present invention. As can be seen from the figure, the method mainly includes six steps:

[0056] S110, determining the key geological parameters of the shale.

[0057] In this step, the correlation between various geological parameters of the shale formation is mainly analyzed, and the independent geological parameters are selected as evaluation parameters.

[0058] For example, the independent parameters associated with geological sweetness mainly include total porosity, organic matter porosity, matrix permeability, shale thickness, natural fracture development degree (0 no development, 0.5 general development, 1 pole development), total gas content, Free gas ratio, pressure coeff...

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Abstract

The invention discloses a method for calculating the geological sweetness and the engineering sweetness of shale gas. The method selects evaluation parameters with independence, the accumulated yield after pressing is taken as a basis, weight allocation of the parameters is calculated by adopting a grey relevant degree method, and the sweetness of shale is represented by applying a calculating method of a European type paste progress. According to the method for calculating the geological sweetness and the engineering sweetness of the shale gas, the problems that the pertinence of fracturing construction section cluster partition conducted on a well is not strong and the effective gassing section cluster proportion is not high in a shale oil and gas reservoir are successfully solved, and the strong evidence is provided for optimization of a sectional fracturing section and a cluster position of a horizontal well, so that the target of cost decreasing and benefit increasing is furthest achieved.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a method for calculating the geological sweetness and engineering sweetness of shale gas. Background technique [0002] At present, there are many evaluation methods for shale geological sweet spots and engineering sweet spots. The evaluation parameters of geological sweet spots mainly include organic carbon content (TOC), thermal maturity (R O ), gas content, porosity, characteristic parameters of natural fractures and pore pressure, etc. The evaluation parameters of engineering sweet spots mainly include rock mineral composition and rock mechanical parameters. However, the currently known evaluation methods mainly have the following problems: [0003] 1) The independence of the evaluation parameters involved in the calculation of geological sweet spots and engineering sweet spots needs to be discussed. This is because putting all relevant parameters into the m...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B43/267
CPCE21B43/267E21B49/00
Inventor 蒋廷学卞晓冰路保平苏瑗贾长贵王海涛李双明卫然
Owner CHINA PETROLEUM & CHEM CORP
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