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A Calculation Method of Total Reserves of Shale Gas Reservoir Considering Multiple Factors

A technology of shale gas reservoirs and calculation methods, applied in calculation, earthwork drilling, design optimization/simulation, etc., can solve problems such as only considering the storage of adsorption phase, taking dissolved gas into consideration, and mass production data

Active Publication Date: 2019-09-06
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

Jiang Ruizhong et al. derived the calculation formula of shale gas reserves from the molecular point of view, but only considered the adsorption phase reserves composed of a single methane molecule
The material balance method is often used to calculate the producing geological reserves of shale gas reservoirs, which requires a large amount of production data. When many scholars use the material balance equation to calculate the reserves of shale gas reservoirs, they do not take the dissolved gas dissolved in the kerogen into account. lead to inaccurate calculation results

Method used

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  • A Calculation Method of Total Reserves of Shale Gas Reservoir Considering Multiple Factors
  • A Calculation Method of Total Reserves of Shale Gas Reservoir Considering Multiple Factors
  • A Calculation Method of Total Reserves of Shale Gas Reservoir Considering Multiple Factors

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Embodiment

[0190] The basic parameters of the Fuling shale gas reservoir are as follows: p o =36.49MPa, B gi =0.0035, S mi = 0.3, C m =9.182×10 -4 MPa -1 , S fi =0.04, C f =9.151×10 -3 MPa -1 , C w =4.629×10 -4 MPa -1 , ρ b =2.53g / cm 3 , =0.05, T=355.15K, C TO = 3.81%, =0.0019, =0.04, ρ ko =1.325g / cm 3 , Young's modulus is 26800MPa, and natural gas density is 77000g / cm under standard conditions 3 , its critical desorption pressure p d = 35.49 MPa. Other basic parameters are shown in Table 1, and production data are shown in Table 2.

[0191] Table 1. Basic parameters such as Langmuir value and thermodynamics of components in shale gas reservoirs.

[0192]

[0193] Table 2 Production Data

[0194]

[0195] Using the above data, the material balance equation derived in this paper is used to perform the regression of gas reservoir reserves. The results are as follows figure 2 and Table 3.

[0196] Table 3 Comparison of calculation results of different meth...

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Abstract

The invention discloses a shale gas reservoir total reserve calculation method considering multiple factors, comprising the following steps: testing and collecting basic parameters and production dataof the shale gas reservoir; considering fractured free gas, porosity of adsorbed phase, volume change of adsorbed phase, critical desorption pressure of adsorbed gas and shrinkage effect of adsorbedgas desorption on matrix, and considering multi-component adsorption and dissolved gas simultaneously, establishing the material balance equation of shale gas reservoir, and finally obtaining the total reserves equation of shale gas reservoir; the basic parameters and production data of shale gas reservoir are processed according to the established material balance equation, and the relevant curves are drawn; finally, calculating the total reserves of shale gas reservoir Gt. A material balance equation of a new shale gas reservoir is established by comprehensively considering that shrinkage effect of multi-component adsorption and dissolving gas, fracture free gas, adsorption phase porosity, adsorption phase volume change, adsorption gas critical desorption pressure and adsorption gas desorption on a substrate, and the equation has important guiding significance for reasonably calculating the dynamic reserve of the shale gas reservoir.

Description

technical field [0001] The invention relates to a method for calculating the total reserves of shale gas reservoirs in consideration of multiple factors. Background technique [0002] Shale gas is a kind of unconventional natural gas, which mainly occurs in shale gas reservoirs in free state, adsorbed state and a small amount of dissolved state, in which the content of adsorbed gas is generally between 20% and 85%, and the content of dissolved gas is generally 5%. %, which makes its reserve calculation method different from that of conventional gas reservoirs. Generally, there are three methods for calculating shale gas reserves: analogy method, volumetric method and material balance method. [0003] The analogy method is mainly used to roughly evaluate the geological reserves of shale gas reservoirs in the early stage of exploration. Zhang Jinhua et al. and Li Hongxun et al. respectively put forward the applicable conditions of the analogy method. The volumetric method is...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50E21B49/00
CPCE21B49/00G06F30/20
Inventor 胡书勇胡欣芮何浪柳波邓熠黄天野
Owner SOUTHWEST PETROLEUM UNIV
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