A method for predicting and calculating production of shale gas wells

A technology for production forecasting and shale gas wells, which is applied in the field of determination of shale gas production decline curves, can solve problems such as unreachable recoverable resources, achieve wide adaptability and improve accuracy

Active Publication Date: 2018-10-16
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, the value of b directly affects the prediction of future production data such as figure 1 As shown, therefore, it is impossible to accurately predict the ultimate recoverable resources only by using the existing production data

Method used

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  • A method for predicting and calculating production of shale gas wells
  • A method for predicting and calculating production of shale gas wells
  • A method for predicting and calculating production of shale gas wells

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Embodiment Construction

[0054] The present invention will be further described below in conjunction with accompanying drawing.

[0055]A shale gas well production prediction calculation method, comprising the following steps:

[0056] (1) Collect the production data and the corresponding methane carbon isotope data generated on-site by shale gas production wells; the production and production data need to be continuously monitored for more than one year from the date of production of shale gas wells, and the unit is ten thousand Square / day or MCF / DAY, if the monitoring time is less than 24 hours, the output data needs to be regulated as 24 hours. Theoretically speaking, the more monitored data, the better. In the actual operation process, the production data of 1-2 years is generally monitored, and the finally collected data are as follows: figure 2 shown.

[0057] From the day when shale gas wells start to produce, in principle, gas samples are collected at the same time every day to test the cha...

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Abstract

A method for predicting and calculating the production yield of shale gas well comprises the following steps: (1) collecting production data and corresponding methane carbon isotope data generated inthe production well of shale gas on the site; (2) establishing one-dimensional model of single-component gas flow in shale, and obtaining the flow equation of 12CH4 and 13CH4 in shale and the description equation of competitive adsorption of 12CH4 and 13CH4; (3) obtaining the variation characteristics of the instantaneous carbon isotope and the cumulative carbon isotope of methane in the production gas well according to the two equations in the step (2); (4) calculating a production decline curve according to the data obtained in the steps (1), (2) and (3). Compared with the traditional method, the method improves the accuracy of shale gas production decline parameters, and has wide adaptability in the development process of unconventional gas (shale gas, tight gas).

Description

technical field [0001] The invention relates to a method for predicting production of shale gas exploitation, in particular to a method for determining a shale gas production decline curve. Background technique [0002] Production prediction analysis is an empirical technology of reservoir engineering, which extrapolates the future production change trend based on the existing production data of oil or gas wells (usually 1-2 years). Its purpose is to predict future production data and estimate the amount of ultimately recoverable resources. [0003] Generally, output forecasting analysis is to study the relationship between yield and time or yield and cumulative production, and the most common method is to use the ARPS trend equation. The ARPS equation is an empirical decline model, and the equation is as follows: [0004] [0005] where D i is the initial deceleration rate, q i is the initial production rate, b is the ARPS decline curve constant, different values ​​r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q50/02E21B47/00
CPCE21B47/00G06Q10/04G06Q50/02
Inventor 仰云峰
Owner CHINA PETROLEUM & CHEM CORP
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