A method for analyzing production data of shale gas wells with production system changes

A technology for production data and shale gas wells, which is applied in electrical digital data processing, special data processing applications, instruments, etc. It can solve the problems of poor production data quality, intermittent and fluctuating pressure and production data, and eliminate human errors and accumulation. The effect of error, reducing uncertainty and multi-solution, and improving fitting efficiency

CN108614902BActive Publication Date: 2021-06-22CHINA PETROLEUM & CHEM CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2021-06-22

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Abstract

The invention provides a method for analyzing production data of shale gas wells with changing production systems, and belongs to the field of oil field development. The method includes: (1) establishing a well testing analysis model for shale gas wells; (2) obtaining production data and required basic data; (3) calculating production-normalized pressure and production-normalized pressure derivative, and drawing a double-logarithmic graph. The logarithmic chart includes two curves: the double-log curve of production-normalized pressure and material equilibrium time and the double-log curve of production-normalized pressure derivative and material equilibrium time; or calculate the production-normalized pressure integral and production-normalized pressure Integral derivative, draw a double logarithmic chart, the double logarithmic chart includes two curves, the double logarithmic curve of the production normalized pressure integral and the material equilibrium time, and the double logarithmic curve of the production normalized pressure integral derivative and the material equilibrium time.
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Description

technical field

[0001] The invention belongs to the field of oilfield development, and in particular relates to a method for analyzing production data of shale gas wells with changing production systems, which is applied to well test analysis and dynamic description of shale gas wells. Background technique

[0002] Well testing is based on the theory of seepage mechanics, using testing instruments as a means to study and determine the production capacity and physical parameters of test wells and oil, gas, and water layers by measuring production dynamic data such as oil, gas, water, and well pressure and production. As well as the technology of distinguishing the connection relationship between wells or layers, it plays an extremely important role in the exploration and development of new oil and gas fields and the dynamic adjustment of old areas. In order to understand the parameters of a specific well and the corresponding reservoir, according to the different sources of d...

Examples

Embodiment Construction

[0074] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0075] The present invention forms a new method of well test analysis for shale gas well production data. Aiming at shale gas wells with changing production system, the formation standard pressure distribution is deduced, and the working system changes (opening and closing wells, changing oil nozzles, interference between wells, outside pipelines, etc.) Production data fitting and well test analysis of shale gas wells with changing production regimes can be realized by defining virtual equivalent time by defining the virtual equivalent time.

[0076] Such as figure 1 Shown, the inventive method is specifically as follows:

[0077] (1) Definition of standard pressure of shale gas well

[0078] Gas flow in shale involves various conditions such as diffusion effect, adsorption effect and seepage, and pressure-sensitive effects (permeability and porosity change with pre...