Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

An effective volume fracturing method for shale with high clay content

A technology with effective volume and high clay, applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve the problems of high construction pressure, low volume of stimulation, increasing the effective volume of stimulation of shale with high clay content, etc. , to achieve the effect of increasing net pressure, promoting full extension, and increasing intercluster stress interference effect

Active Publication Date: 2022-06-07
CHINA PETROLEUM & CHEM CORP +1
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can improve the problems existing in the current fracturing process, such as: high construction pressure, low fracture complexity and low stimulation volume after fracturing, so as to increase the effective stimulation volume of shale with high clay content and increase the complexity of fractures

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
  • An effective volume fracturing method for shale with high clay content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] A continental shale gas well has a depth of 4013 m, a bathymetry of 5229 m, and a horizontal section length of 1200 m. After the core of the guide eye well and the data analysis of logging, it was found that the clay content of the high-quality shale section of the well was relatively high, reaching more than 50%. To increase production per well, retrofits are performed as follows:

[0086] (1) Based on ECLIPSE, a commonly used commercial simulation software for fracturing production forecasting, and MEYEY, a commonly used commercial simulation software for crack propagation simulation, the optimal fracturing section is determined to be 17 segments based on the simulation optimization of the conventional process, and the scale of single-stage fracturing fluid is 2200m 3 The single-stage sand volume scale is 65m 3 There are 4 clusters in a single section, with a perforation length of 0.75m and a perforation density of 16 wells / m perforated.

[0087] (2) After the first stage...

Embodiment 2

[0101] A continental shale gas well has a depth of 3908 m, a bathymetry of 4213 m, and a horizontal section length of 1400 m. After the core of the guide eye well and the data analysis of logging, it was found that the clay content of the high-quality shale section of the well was relatively high, reaching more than 60%. To increase production per well, retrofits are performed as follows:

[0102] (1) Based on ECLIPSE, a commonly used commercial simulation software for fracturing production forecasting, and MEYEY, a commonly used commercial simulation software for crack propagation simulation, the optimal fracturing section is determined to be 17 segments based on the simulation optimization of the conventional process, and the scale of single-stage fracturing fluid is 2200m 3 The single-stage sand volume scale is 65m 3 There are 8 clusters in a single section, with a perforation length of 0.5 m and a perforation density of 16 wells / m per cluster.

[0103] (2) After completing the...

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 shale effective volume fracturing method with high clay content. Including: (1) analyzing the shale's compressibility, mechanical properties and fracturing quality; (2) optimizing the design fracture shape parameters and fracturing construction parameters; (3) performing perforation operations in the first section; (4) conducting acid treatment; (5) use high-viscosity glue to make the main joint; (6) inject low-viscosity slippery water carrying 70-140 mesh; (7) use high-viscosity glue and temporary plugging agent for temporary plugging construction in the seam; (8) Inject medium-viscosity glue with 40-70 mesh proppants; (9) inject high-viscosity glue with 30-50 mesh proppants; (10) use high-viscosity glue and temporary plugging balls for inter-cluster temporary plugging construction; (11) Adopt replacement construction. The invention can improve the existing problems in the current fracturing process, thereby increasing the effective volume of shale with high clay content and improving the complexity of fractures.

Description

Technical field [0001] The present invention relates to the field of shale gas reservoir stimulation technology, specifically to a high clay content of shale effective volume fracturing method. Background [0002] China's shale gas resources are abundant, but due to its low porosity and low permeability characteristics, it is necessary to obtain commercial air flow through volumetric fracturing operations. It is worth noting that the clay content of continental shale, sea-land transition shale and part of marine shale is relatively high, some even more than 50%, which brings greater difficulties to volumetric fracturing operations. This is due to the fact that with the increase of clay content, the plastic characteristics of shale have increased significantly, the difficulty of shale rupture and extension has increased significantly, and the difficulty of opening branch joints has also increased, which ultimately causes great difficulties in increasing the effective transformatio...

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): E21B43/26E21B43/267E21B43/27E21B43/116E21B33/13E21B49/00G06F17/15
CPCE21B43/26E21B43/267E21B43/116E21B33/13E21B49/00G06F17/15
Inventor 蒋廷学仲冠宇王海涛李双明卞晓冰卫然苏瑗肖博左罗
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com