A fracturing optimization method for deep shale gas reservoirs based on fracability evaluation

A technology of shale gas reservoir and optimization method, which is applied in the directions of multi-objective optimization, design optimization/simulation, earthwork drilling and mining, etc., can solve problems such as optimization of fracturing parameters, and achieve the effect of reliable optimization results.

Active Publication Date: 2022-02-18
SOUTHWEST PETROLEUM UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology is still unable to solve the problem of optimizing fracturing parameters for each fracturing stage of deep shale gas

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A fracturing optimization method for deep shale gas reservoirs based on fracability evaluation
  • A fracturing optimization method for deep shale gas reservoirs based on fracability evaluation
  • A fracturing optimization method for deep shale gas reservoirs based on fracability evaluation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0039] S1. Obtain the geological parameters of the target block. There are many extracted parameters, and only their ranges are listed here;

[0040] Table 1 Geological parameter range of the target block

[0041]

[0042] (1) Parameter normalization processing:

[0043] For positively correlated parameters such as brittle mineral content, brittleness index (Young's modulus), TOC content, gas content, porosity, and formation pressure coefficient, the parameter normalization equation is as follows:

[0044]

[0045] For negatively correlated parameters such as clay mineral content, Poisson’s ratio, stress difference, tensile strength, compressive strength, fracture toughness, and shale density, the parameter normalization equation is as follows:

[0046]

[0047] (2)...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a deep shale gas reservoir fracturing optimization method based on fracability evaluation, which includes: obtaining geological parameters, establishing a three-dimensional geological model; performing grid division on the geological model and calculating the fracturing of all geological grids respectively Comprehensive fracturing index; according to the comprehensive fracturing index, all geological grids are divided into three levels and the geological grids of the same level are classified into the same level of fracturing section; for each level of fracturing The production simulation is carried out under the conditions of fixed fluid intensity and different sanding intensity, and the construction curves of different stages are obtained. The highest inflection point of the curve is the optimal fracturing design parameter; According to the calculated stages, directly select the optimal fracturing design parameters of this stage determined in the previous step as the optimal parameters for construction. The present invention obtains a more comprehensive characterization of the fracturability of the fracturing interval, and conducts more precise fracturing design parameter optimization for each fracturing well section, so that the optimization result is more reliable and has practical significance.

Description

technical field [0001] The invention relates to the technical field of gas reservoir exploitation, in particular to a deep shale gas reservoir fracturing optimization method based on fracability evaluation. Background technique [0002] With the deepening of burial depth, the three-dimensional stress and horizontal stress difference of shale gas reservoirs increase, the rock plasticity characteristics are enhanced, the compressibility of reservoirs is poor, and fracture extension is difficult, which is not conducive to the formation of complex fracture networks. [0003] According to literature research at home and abroad, after staged fracturing of shale gas horizontal wells, the gas production of gas wells basically conforms to the "three-three-three" principle, that is, the gas production contribution rate of about one-third of the stage clusters reaches 70%. About one-third of the segment clusters contribute about 30% of the gas production, and the remaining one-third of...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06T17/05E21B43/26G06F111/06G06F111/10G06F113/08G06F119/14
CPCG06F30/20G06T17/05E21B43/26G06F2111/10G06F2111/06G06F2119/14G06F2113/08
Inventor 赵玉龙阮奇罗山贵张芮菡唐慧莹郭晶晶
Owner SOUTHWEST PETROLEUM UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap