Underground gasification well cementing method and well structure

A technology of underground gasification and well structure, applied in the direction of coal gasification, underground mining, drilling equipment and methods, etc., can solve problems such as casing fracture

Active Publication Date: 2015-04-29
ENN SCI & TECH DEV
View PDF8 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned patents have no effect on casing fra

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
  • Underground gasification well cementing method and well structure
  • Underground gasification well cementing method and well structure
  • Underground gasification well cementing method and well structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] Embodiments of the present invention are described below with reference to the drawings.

[0022] see figure 1 In this embodiment, an embodiment of the underground gasification cementing method of the present invention is provided, which is used for the gasification of underground coal seams.

[0023] In the method of this embodiment, during the construction process of the well 2 leading into the coal seam 1 from the ground, or after the construction is completed, the following step of setting the cementing casing 3 is performed: the cementing casing 3 is lowered into the well 2 until the cementing casing 3 is set. The bottom end of the well casing 3 enters the coal seam 1 to a set depth and stops, and the cementing casing 3 is connected to the well wall of the well 2 . Wherein, the cementing casing 3 at least includes a telescopic flexible casing 31, the bottom end of the telescopic flexible casing 31 constitutes the bottom end of the cementing casing 3, and the lengt...

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

PropertyMeasurementUnit
Compressive strengthaaaaaaaaaa
Heat resistance temperatureaaaaaaaaaa
Login to view more

Abstract

The invention relates to an underground gasification well cementing method and a well structure. The method comprises the following steps: descending a well-cementing sleeve into a well, stopping descending the well-cementing sleeve until the bottom end of the well-cementing sleeve enters into a coal seam for a set depth, and connecting the well-cementing sleeve with the well wall of the well, wherein the well-cementing sleeve at least comprises a flexible sleeve, the bottom end of the telescopic flexible sleeve forms a bottom end of the well-cementing sleeve, and the length of the telescopic flexible sleeve is greater than or equal to the sum of the maximum height of a water diversion fissure zone above the coal seam and the set depth. The well structure comprises a well which is communicated with the coal seam from the ground and the well-cementing sleeve, wherein the well-cementing sleeve is connected with the well wall of the well; the well-cementing sleeve comprises the telescopic flexible sleeve, the bottom end of the telescopic flexible sleeve is positioned at the set depth of the coal seam, and the length of the telescopic flexible sleeve is greater than or equal to the sum of the maximum height of the water diversion fissure zone above the coal seam and the set depth. The method and the well structure are capable of preventing well-cementing sleeve breakage caused by fissure of stratum above the coal seam in each direction.

Description

technical field [0001] The invention relates to the field of underground coal gasification, in particular to an underground gasification well cementing method and a well structure. Background technique [0002] In underground gasification, oilfield development, and coalbed methane exploitation, failure phenomena such as damage, corrosion, and fracture of cementing casings occur due to improper operation of cementing casings, changes in ground stress, and corrosion in harsh downhole environments. Among them, due to water injection fracturing, pressure increase, heating, goafing and other operations on the target layer, the stratum above the target layer is filled with liquid pressure and rises or loses support and sinks, causing the cementing casing to be squeezed and deformed. Even fracture, making the drilling can not be used normally. In underground coal gasification, due to factors such as the need to inject gasification agents into the underground coal seam, the combust...

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
IPC IPC(8): E21B7/20E21B17/00
CPCE21B17/20E21B7/20E21B43/295
Inventor 陈峰潘霞
Owner ENN SCI & TECH DEV
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