A method and system for determining the dynamic production in the whole cycle of the production decline stage of fracturing wells

Abstract

The invention belongs to the technical field of production prediction of hydraulic fracturing development wells in unconventional reservoirs, and discloses a method and a system for determining the dynamic production in the whole cycle of the production decline stage of fracturing wells, and constructing the production decline in the whole cycle production of unconventional reservoirs. Decline rate: Combined with the definition of production decline rate, integrate the full-cycle production decline rate constructed to obtain the production calculation expression of the fracturing well production decline stage; collect the data of production and time; use the production calculation expression of the fracturing well production decline stage To fit the data of production changes with time, obtain the initial decline rate, later decline rate, time coefficient and decline index of undetermined parameters. The production calculation expression of the production decline stage of the fractured well calculates the production at any time in the decline stage, and finally determines the dynamic production in the whole cycle of the hydraulic fracturing well production decline stage in the unconventional reservoir.

Description

technical field [0001] The invention belongs to the technical field of production prediction of hydraulic fracturing development wells in unconventional reservoirs, and in particular relates to a method and a system for determining the dynamic production in the whole cycle of the production decline stage of fracturing wells. Background technique [0002] At present, unconventional resources such as tight oil and gas and shale oil and gas in my country are widely distributed and have large reserves, which have a material basis for efficient development. Because unconventional reservoirs usually have poor physical properties, hydraulic fracturing reservoir stimulation technology is needed to realize the economical and efficient development of unconventional resources. The effect of hydraulic fracturing reservoir stimulation (such as stimulation area, stimulation degree, etc.) is controlled by process technology and reservoir lithology, and the stimulation effect is limited. Th...

AI Technical Summary

Problems solved by technology

At present, there are some data-driven studies describing the "L"-shaped characteristics of production decline in fractured wells, but none of them have given a description method with physical meaning, let alone the production value in the full period of production decline

[0003] Through the above analysis, the existing problems and defects of the existing technology are as follows: there are some data-driven studies on the description of the "L" type of production decline in fractured wells, but none of them have given a description method with physical meaning, which is difficult to identify The decline type of the "L"-shaped decline curve, and the production value in the whole period of the production decline stage is not given.

[0004] The difficulty of solving the above problems and defects is: how to establish a description method of an "L"-shaped decreasing curve with physical meaning is difficult

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