Layered rock salt selective solution mining cavity construction control process
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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: 2020-02-07
江苏省制盐工业研究所有限公司 +1
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[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
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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 rock salt selective solution mining cavity construction control process. The layered rock salt selective solution mining cavity construction control process specifically comprises the steps that during the construction of a salt cavern reservoir, first, drilling and fracturing are performed on an interlayer in a drilling stage, and the integrity of the interlayeris destroyed within a certain range; secondly, in the process of rock salt mining, an upper salt layer and a lower salt layer of the interlayer are first eroded to construct a cavity to enable the interlayer to be immersed in brine for a long time; meanwhile, the composition of a well injection water solution is changed to preferentially dissolve part of substances in the interlayer, and the interlayer structure is destroyed; and in addition, through a self-vibrating cavitating water jet device, the downhole water injection direction and water injection pressure are adjusted to increase the erosion effect on the interlayer and further promote the rapid denudation and collapse of the interlayer. Different mining schemes are adopted for different rock salt layer positions, the problem thatthe thick interlayer in layered rock salt is difficult to collapse is solved, and effective control over the shape of the solution cavity of the salt cavern reservoir is realized.
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...
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