Method for determining the characteristic parameters of each stimulated stage in a multi-stage fractured horizontal well in unconventional oil and gas reservoirs

Abstract

The invention discloses a method for determining the characteristic parameters of each stimulation section of a multi-stage fracturing horizontal well in an unconventional oil and gas reservoir, comprising the following steps: S1: collecting basic information and data of the finishing well and reservoir; S2: collecting daily test pressure data of the finishing well ; S3: Collect and organize the daily test production data of the well; S4: Split the production data to obtain the production data of fracturing stages at all levels; S5: Select a modern production decline analysis software for commonly used oil and gas wells, and input The basic information of the layer, the daily test pressure data and the production data of the reformed sections at all levels obtained by splitting, draw the double-logarithmic curves of the dimensionless yield integral and the derivative of the dimensionless yield integral and time respectively; S6: The fitting interpretation is carried out to obtain the characteristic parameters of the reformed sections at all levels. The invention can economically and efficiently evaluate reservoir characteristic parameters and fracture characteristic parameters of various stages of stimulation, and has important guiding significance for efficient development of multi-stage fracturing horizontal wells after fracturing.

Description

technical field [0001] The invention relates to the technical field of unconventional oil and gas development, in particular to a method for determining characteristic parameters of each stimulation section of a multi-stage fracturing horizontal well in an unconventional oil and gas reservoir. Background technique [0002] With the rapid development of industrialization, the relationship between the supply and demand of my country's oil resources is becoming increasingly tense, and the development of oil and natural gas is constantly being explored. The role of unconventional oil and gas in energy supply is becoming more and more important. Due to the characteristics of low permeability, ultra-low permeability, and tightness of unconventional oil and gas reservoirs, under conventional horizontal well development methods, problems such as low production and low effective production of reserves often occur, making it difficult to meet the requirements of efficient development. ...

AI Technical Summary

Problems solved by technology

Microseismic monitoring faces many problems, mainly because the vertical positioning resolution of surface monitoring is insufficient, while the horizontal positioning resolution of downhole monitoring is low, and its operation cost is high, the parameters explained are relatively limited, and the fracture conductivity cannot be explained

[0006] Therefore, for multi-stage fractured horizontal wells, how to economically and efficiently evaluate the reservoir characteristic parameters and fracture characteristic parameters of the stimulated stages at all levels still faces a huge technical challenge

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