Method for discharging brine from accumulated residues at salt cavity bottoms and communication section of old cavities of butted wells

A technology of salt cavity and residue, which is applied in the field of natural gas storage and effective utilization of residue space accumulated at the bottom of salt cavern gas storage, and can solve problems such as difficult discharge of brine

Active Publication Date: 2020-10-30
PETROCHINA CO LTD
View PDF7 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method involves the efficient use of old well cavity by water-soluble salt mining in drilling, and mainly solves the problem that t

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
  • Method for discharging brine from accumulated residues at salt cavity bottoms and communication section of old cavities of butted wells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention will be described in detail below in conjunction with the following specific examples, but it should not be construed as limiting the scope of the present invention.

[0035] Attached below figure 1 The present invention is described further:

[0036] Depend on figure 1 As shown, this embodiment provides a method for discharging the brine in the bottom of the old salt chamber and the accumulated residue in the horizontal communication section of the well, wherein the method includes the following specific steps:

[0037] Evaluate the thickness and geometry of the old cavity (including the cavity 3 not filled with residue and the cavity 4 occupied by residue) to select the one whose shape meets the geometrically stable shape and the thickness of the roof and bottom plate meets the sealing requiremen...

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 provides a method for discharging brine from accumulated residues at salt cavity bottoms and a communication section of old cavities of butted wells. The method comprises the following steps that (1) water injection well shafts and brine extraction well shafts of the butted wells are transformed correspondingly so as to be used as gas injection wells in a gas injection stage of a gasstorage and as gas extraction wells in a gas extraction stage; (2) a brine discharging well is drilled between the butted wells, so that the brine discharging well is drilled into insoluble residuesin a horizontal communication channel between the butted wells, reaming is carried out on a well hole of an insoluble residue section, and then well cementation construction is carried out; and (3) injection-production strings and a brine discharging string are lowered into the gas injection wells and the brine discharging well respectively according to design requirements, natural gas is injectedinto the gas injection wells, and the brine is discharged from the brine discharging well. The provided method can be used for efficiently utilizing the old cavities of the butted wells through welldrilling water-soluble salt mining, and mainly solves the problem that the brine in the accumulated residues at the salt cavity bottoms and the horizontal communication section is difficult to discharge.

Description

technical field [0001] The invention relates to a method for discharging the brine in the residue accumulated in the bottom of the salt chamber of the old cavity of the well and the connecting section, which belongs to the technical field of natural gas storage, and further belongs to the technical field of the effective utilization of the residue space accumulated at the bottom of the salt cavern gas storage. Background technique [0002] Drilling and water-soluble method of drilling salt is the dominant salt mining method in rock salt deposits in my country at the present stage. The main type of salt mining and dissolution cavity formed in the near future and in the future is the cavity formed by the well. The shape of the cavity formed by the well is complex, and the shape of the salt cavity is usually U-shaped. Most of the salt rock deposits in my country are layered salt rocks, which contain a large amount of insoluble interlayers, and the grade of salt rock in salt mi...

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): E21F17/16
CPCE21F17/16
Inventor 垢艳侠李康完颜祺琪冉莉娜李东旭丁国生郑得文郑雅丽邱小松武志德张敏
Owner PETROCHINA CO LTD
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