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Self-propelled type rotary jet flow horizontal well cavity construction method

A horizontal well and self-advancement technology, applied in the field of rock-salt layer cavity construction, can solve the problems of salt body dissolution and penetration, and achieve the effect of large cavity shape

Inactive Publication Date: 2018-09-21
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the water-soluble cavity-making method of double-well horizontally connected well groups is prone to undissolved "saddle"-shaped salt bodies, and the situation that the middle cannot be dissolved and penetrated.

Method used

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  • Self-propelled type rotary jet flow horizontal well cavity construction method
  • Self-propelled type rotary jet flow horizontal well cavity construction method
  • Self-propelled type rotary jet flow horizontal well cavity construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The self-propelled rotating jet horizontal well cavity building method in this embodiment includes cavity building of two wells horizontally connected well groups and water jet cavity expansion.

[0031] The cavity making of the double-well horizontally connected well group includes the following steps:

[0032] a. Firstly drill a vertical shaft and an inclined shaft to reach the target salt layer, then drill a horizontal well to connect the vertical shaft and the inclined shaft, and lower the corresponding center pipe in the vertical shaft, the inclined shaft and the horizontal shaft;

[0033] b. Carry out brine injection and production in stages, and build a cavity through water dissolution.

[0034] The water jet cavity expansion includes the following steps:

[0035] c. Assemble the water jet cavity expansion equipment: connect one end of the hollow double-layer hose to the high-pressure water pump, connect the other end of the hollow double-layer hose to the steer...

Embodiment 2

[0038] The self-propelled rotating jet horizontal well cavity building method in this embodiment includes single well water solution cavity building and water jet cavity expansion;

[0039] The single-well water-solution cavity-building includes the following steps:

[0040] a. Drill a shaft first and install the casing;

[0041] b. Carry out brine injection and production in stages, and build a cavity through water dissolution.

[0042] The water jet cavity expansion includes the following steps:

[0043]c. Assemble the water jet cavity expansion equipment: connect one end of the hollow double-layer hose to the high-pressure water pump, connect the other end of the hollow double-layer hose to the steering gear, and connect the ultrasonic detector and water jet nozzle to the steering gear; Select a buoyancy ring with appropriate buoyancy for the brine density, and install the assembled water jet nozzle, ultrasonic detector and diverter on the buoyancy ring, which is used to ...

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Abstract

The invention discloses a self-propelled type rotary jet flow horizontal well cavity construction method. The method includes the steps of dual-well horizontal communication well group cavity construction and water jet flow cavity expansion. The water jet flow cavity expansion step includes the substeps of assembling a water jet flow cavity expansion device, detecting the shape of a cavity throughan ultrasonic detector, determining a saddle-shaped undissolved area, and adjusting a water jet flow spraying nozzle to conduct jet flow dissolving on the saddle-shaped undissolved area according toa detecting result until the saddle-shaped undissolved area is completely dissolved. On the basis of an existing dual-well horizontal communication well group cavity construction technology, through awater jet flow cavity expansion technology, jet flow dissolving is independently conducted on the saddle-shaped undissolved area left after dual-well horizontal communication well group cavity construction, the dissolving conditions and cavity shape are monitored during ultrasonic detection, the problem of the saddle-shaped undissolved area is solved, it is ensured that the size and shape of thewhole cavity reach the expected effect, and the cavity can meet the comprehensive utilization requirement.

Description

technical field [0001] The invention relates to the technical field of rock-salt bed cavity building, in particular to a horizontal well cavity building method. Background technique [0002] Salt rock has excellent characteristics such as low permeability, low porosity, good rheological properties, and water-soluble mining, and is internationally recognized as the best medium for energy storage. my country's underground rock salt resources are abundant and widely distributed, buried tens to thousands of meters underground, and have the geological conditions for building large-scale underground gas storage. At present, 15 wells have been put into use in the Jiangsu Jintan gas storage under construction, which has played a key role in the peak shaving of gas supply in East China. At the same time, the planning and pilot work of salt cavern storage is also being carried out in Yingcheng and Qianjiang in Hubei, Huaian in Jiangsu, Pingdingshan in Henan and other places. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F17/16
CPCE21F17/16
Inventor 姜德义陈结徐喆刘伟范金洋吴斐何怡康燕飞卢丹张治鑫任松蒋昌奇刘文浩岳好学
Owner CHONGQING UNIV