A control technology for layered salt rock selective solution mining cavity creation

A selective, salt-rock technology that can be used in fluid production, earth-moving drilling, wellbore/well components, etc., and can solve problems such as the influence of thick interlayers on the stability of the salt cavity

Active Publication Date: 2021-01-29
江苏省制盐工业研究所有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention provides a layered salt rock selective solution mining cavity control process, which solves the influence of thick interlayers on the stability of salt cavity

Method used

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  • A control technology for layered salt rock selective solution mining cavity creation
  • A control technology for layered salt rock selective solution mining cavity creation
  • A control technology for layered salt rock selective solution mining cavity creation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] (1) Drill a single well from the surface. In the drilling stage, firstly drill the hole to the bottom of the salt rock. Through sidetracking and other methods, a series of side holes 9 are formed inside the thick interlayer, and then through small-scale fracturing, so that effective holes and connected fractures 10 are formed inside the thick interlayer, such as figure 1 , figure 2 shown.

[0066] (2) After the thick interlayer pores and fractures are formed, the salt rock in the lower part of the thick interlayer is mined to make full use of the salt rock resources and provide space for the interlayer collapse.

[0067] (3) When the salt rock in the lower part of the thick interlayer is mined, water is mainly injected through the center pipe 13 of Φ114mm, and the brine is extracted from the annular space between the center pipe 12 and the center pipe 13 of Φ177.8mm, and the salt rock is mined from the bottom of the salt rock layer to form a small area Dissolving cav...

Embodiment 2

[0074] (1) Drill two wells from the surface, one vertical well 18, one horizontal butt well 19, and the distance between the two wells is 200m. In the process of solution production in the opposite well, there are Φ244.5mm technical casing and Φ177.8mm intermediate pipe in the well.

[0075] (2) After the drilling is completed, through physical action, holes and fractures 10 are formed in the thick interlayers around the wellbore of the two wells, which mainly include: single wellbore for fracturing the interlayer; through sidetracking, horizontal wells are drilled in the interlayer, A series of side holes 9 are formed inside the interlayer, and then through small-scale fracturing, the interlayer forms effective holes and connected fractures 10 within a certain range, such as Figure 7 shown.

[0076] (3) After the pores and fractures of the thick interlayer are formed, the salt rock in the lower part of the thick interlayer is mined. When mining the salt rock below the thic...

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Abstract

The invention relates to a layered salt rock selective solution mining cavity control process, specifically in the construction process of the salt cavern storage, firstly, the interlayer is drilled and fractured in the drilling stage, and the integrity of the interlayer is destroyed within a certain range Secondly, in the process of salt rock mining, the upper and lower salt layers of the interlayer are firstly dissolved to create cavity, so that the interlayer is soaked in brine for a long time; at the same time, the composition of the injection water solution is changed, so that some substances in the interlayer are preferentially dissolved and destroyed. Sandwich structure; in addition, through the self-vibrating cavitation jet device, the downhole water injection direction and water injection pressure are adjusted to increase the erosion of the interlayer and further promote the rapid denudation and collapse of the interlayer. The invention adopts different mining schemes for different salt rock layers, solves the problem that the thick interlayer in the layered salt rock is difficult to collapse, and realizes effective control of the shape of the solution cavity of the salt cavern storage.

Description

technical field [0001] The invention relates to a layered salt rock selective solution mining cavity control process, which belongs to the technical field of salt cavern underground storage (gas storage or oil storage) cavity building technology, and specifically relates to a method for salt rock containing insoluble or insoluble thick Interlayer selective dissolution mining control technology. Background technique [0002] Salt cavern storage is based on the characteristics of low permeability and low porosity of salt rock formation, and uses the salt rock cavern left by water solution mining to store oil or natural gas. Almost all salt cavern storages in foreign countries are built in huge salt domes. The salt rocks are thick, high-grade, and less insoluble, so it is easier to build large-scale salt cavern storages. [0003] Compared with foreign conditions for building reservoirs, my country's salt rock deposits have unfavorable factors such as many interlayers and low g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/28E21B43/30
CPCE21B43/28E21B43/283E21B43/305
Inventor 李行刘凯许鹏张文广卢青峰付星辉郝金波
Owner 江苏省制盐工业研究所有限公司
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