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One-inclined multi-vertical cascaded well group salt mine mining method

A mining method and technology of well groups, which are applied in surface mining, earthwork drilling, underground mining, etc., can solve the problems of restricting the progress of salt mine mining, exposed collapse and damage of the deflecting section, and improve the safety production level and mining efficiency. , The effect of improving brine quality and service life

Inactive Publication Date: 2015-04-01
中盐勘察设计院有限公司
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Problems solved by technology

In the mining practice of horizontal butt joint wells in salt mines, directional horizontal wells, that is, directional wells, often have failures, such as damage to the casing in the build-up section, collapse and blockage of the build-up section, which greatly restrict the development of salt mines. mining progress

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  • One-inclined multi-vertical cascaded well group salt mine mining method

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Embodiment 1

[0034] A certain salt mine, with a depth of 1,000 meters and a thickness of about 60 meters, was originally mined with a "straight-inclined" horizontal butt joint well group. Because there are many inclined wells, a large amount of resources near the boundary were wasted. The cost of drilling is increased, and brine wells are often blocked or even scrapped during the production process of deviated wells.

[0035] In the embodiment of the present invention, the well group string is designed as 6 wells, which are divided into 3 groups of wells, and the distance between the wellheads at both ends is 850 meters. The well spacing of the first group and the second group is 100 meters, and the third group is straight and inclined, the well spacing is 250 meters, and the radius of the arc curve of the deflection section is 150 meters. The distance between the well groups is 200 meters, and the length of the cement plug 3 in the horizontal section is 100 meters. The specific steps are:...

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Abstract

The invention discloses a one-inclined multi-vertical cascaded well group salt mine mining method. A well group axis is designed according to the mine bed depth of a salt mine; a first vertical well at the end part of the axis is drilled to establish a first salt groove; an oriented horizontal well is drilled at the other end of the axis; drilling is carried in a salt layer along the axis, and the oriented horizontal well is in butt joint communication with the first vertical well; a second salt groove is established and a second vertical well is drilled so that a pair of communicated wells are formed by the first vertical well and the second vertical well; and one or more pairs of communicated wells are reconstructed until the final vertical well is established, so that a pair of circulating wells is formed by the final vertical well and the oriented horizontal well. According to the one-inclined multi-straight cascaded well group salt mine mining method, the oriented horizontal well with the large displacement is drilled and is communicated with the plurality of vertical wells to form a plurality of double-well well sets, so that the inclined section construction of a drilling well is reduced, and the respective advantages of the vertical walls and the oriented horizontal well are sufficiently developed; the problems that the oriented horizontal well occupies excessive resources and a well shaft is easy to damage are solved; and an accident that the oriented well is blocked in a salt mining process is reduced, and the safety production level and the mining efficiency of the salt well are improved.

Description

technical field [0001] The invention relates to a water-soluble mining technology for drilling a salt deposit, in particular to a salt mining method for a group of wells connected in series with one oblique and multiple straight lines. Background technique [0002] The horizontal butt joint well mining method is to use directional drilling technology to drill vertical wells and directional horizontal wells to form a solution circulation channel in the salt deposit to exploit salt resources. At present, in the technical field of well drilling and water-soluble mining in the mine salt industry, the horizontal butt joint mining method has been widely used. [0003] In the existing horizontal butt joint well technology, straight and one-slant butt joint wells or double-slope butt joint wells are generally used. In the mining practice of horizontal butt joint wells in salt mines, directional horizontal wells, that is, directional wells, often have failures, such as damage to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/20
CPCE21C41/20
Inventor 樊传忠
Owner 中盐勘察设计院有限公司
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