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Single borehole multilateral directional butted well salt mining method

A technology of docking wells and single drilling holes, which is applied in earth-moving drilling, surface mining, underground mining, etc., can solve the problems of difficulty in drilling and mining in salt mines and high drilling costs, and is conducive to stope pressure management and accurate docking. The effect of improving efficiency, directional design and simplification of construction work

Inactive Publication Date: 2015-05-13
中盐勘察设计院有限公司
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AI Technical Summary

Problems solved by technology

When mining deeper salt mines, the cost of drilling is too high, which makes it difficult to carry out drilling work in salt mines.

Method used

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  • Single borehole multilateral directional butted well salt mining method
  • Single borehole multilateral directional butted well salt mining method
  • Single borehole multilateral directional butted well salt mining method

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Embodiment 1

[0032] see Figure 5 , in the embodiment of the present invention, a single drilling branch directional butt joint well salt mining method, taking the Dongying Delta Salt Mine in Shandong as an example, the mining depth of the salt mine is about 4000 meters, and the directional horizontal well connection mining method is proposed. There are 2 wells in each group, the total drilling depth of the well group reaches about 8,500 meters, and the total cost of the well group reaches more than 25 million yuan. Adopting the single-drilling branch butt-joint communication mode of the present invention will reduce the drilling footage of each well group by more than 3,500 meters, and save about 70% of the well construction cost. Specific steps are as follows:

[0033] Step 1: First, use a Φ444.5mm drill bit to open the hole, drill to a depth of 400 meters, and run into a Φ339.7mm casing for about 400 meters of cementing; then use a Φ311.1mm drill bit to drill to about 3480 meters, that...

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Abstract

The invention discloses a single borehole multilateral directional butted well salt mining method, which comprises the steps of: firstly conducting boring to a predetermined depth K1, then performing deflection by a directional drilling technology, boring out an inclined shaft through W1 and K2 points and reaching a T point in the ore bed, laying a casing pipe A to form a well, and conducting dissolution in the ore bed to build a small cave; in the same borehole, using a smaller level boring tool to pass through the deflecting point K1, carrying out boring downward vertically to a predetermined deflecting point K3, performing deflecting boring into the ore bed, laying a casing pipe B in the section of small-caliber borehole for well cementation; in the casing pipe B, using a smaller level boring tool to conduct further deflecting, boring a horizontal well section in the ore bed to realize butt joint with the small cave built in the first step; laying a center pipe in the casing pipe B, carrying out sealing connection on the center pipe end and the casing pipe B with a packer, and mounting well head equipment. The method provided by the invention utilizes directional boring and multilateral well technologies to build the horizontal butted well channel meeting brine mining at a smallest boring project amount.

Description

technical field [0001] The invention relates to a method for drilling and water-soluble mining of salt deposits, in particular to a method for extracting salt from single-drilling branch-directed butt joint wells. 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] Usually when using the horizontal butt well mining method, the channel length in the salt layer, that is, the bottom displacement of the horizontal well generally ranges from 150 meters to 500 meters. If the mining depth is 500 meters to 2000 meters, it is more reasonable to drill two wells to form a well group for the construction of ho...

Claims

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Application Information

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IPC IPC(8): E21C41/20
CPCE21C41/20
Inventor 樊传忠续培信
Owner 中盐勘察设计院有限公司
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