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Method for improving low permeable mineral reservoir

A low-permeability reservoir and low-permeability technology, which is applied in the direction of earthwork drilling, mining fluids, wellbore/well components, etc., can solve the problems of low mineral recovery rate, reduced reservoir permeability, and poor mineral permeability, etc., to achieve improved The effects of mining efficiency, shortening mining time, and increasing mining rate

Inactive Publication Date: 2006-03-29
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Borehole drainage method (including dense drilling and reaming method), its drainage effect depends entirely on the characteristics of the mineral reservoir itself, and neither drilling nor reaming can improve the permeability of the reservoir
In many cases, the stress concentration around the borehole will reduce the permeability of the reservoir instead, that is, form a barrier for fluid minerals to flow to the drainage borehole, affecting the mining of minerals
[0004] 2. Hydraulic fracturing and drainage method (including sand fracturing method, etc.), because only a small crack is formed in the reservoir when high-pressure water fracturing or sand fracturing is used, it cannot improve well The permeability of the reservoir; conversely, such fractures also reduce the permeability of their surroundings
[0005] Due to the poor permeability of minerals in low-permeability mineral reservoirs, how to effectively mine is a difficult problem in this technical field. At present, the mining methods of the prior art cannot improve its permeability, so the recovery rate of minerals is very low

Method used

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  • Method for improving low permeable mineral reservoir
  • Method for improving low permeable mineral reservoir
  • Method for improving low permeable mineral reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 , 2 As shown, in underground mining, a method for reforming low-permeability mineral reservoirs is to implement horizontal slots 4 on low-permeability mineral reservoirs 1, the horizontal slots are horizontal along the reservoir strike, and It is approximately parallel to the bottom surface of the reservoir, and there are support bands 5 between the horizontal slots.

[0027] The height of the horizontal slot is calculated by the formula: H≥Mε, where: H represents the height of the slot, M represents the thickness of the reservoir, and ε represents the elastic strain.

[0028] The technical parameters for the width of the horizontal slots are: 3M≥B≥2M, where B represents the width of the slots, and M represents the thickness of the reservoir.

[0029] The length of the horizontal slot in the reservoir dip direction is calculated by the formula: L≥10M, where: L represents its length, and M represents the thickness of the reservoir.

[0030] The positi...

Embodiment 2

[0034] Such as image 3 As shown, when the vertical drilling on the ground is mined, a method of reforming the permeable mineral reservoir is to perform horizontal drilling 2 on the reservoir 1 radially in the same horizontal plane in a drilling 7, and when the design depth is reached Finally, change the jet flow direction of the drill bit, and when the drill bit returns from the inside to the outside, the horizontal jet will perform horizontal slits 3 on the reservoir; repeat the above steps, and the reservoir will form a plurality of radial horizontal slits along the radial direction, adjacent to each other. A support belt 5 is left between the slots, so that the stress of the reservoir is released and the rock mass undergoes subsidence and fracture. The calculation of technical parameters such as the height H, width B, and length L of the horizontal slot 3 is the same as

[0035] Example 1.

Embodiment 3

[0037] Such as Figure 4 As shown in , 5, during well mining, a method for reforming low-permeability mineral reservoirs is to use a water jet drilling rig to first implement horizontal drilling 2 in reservoir 1, and when the design depth is reached, change the jet flow of the drill bit direction, while the drill bit returns from the inside to the outside, the horizontal jet performs horizontal slotting 3 on the reservoir; repeat the above steps to form multiple connected horizontal slots to reach the width of the designed horizontal slot. Then leave the support belt 5, and then implement the next horizontal slot, so that the cycle is completed to complete the construction of the horizontal slot. In this way, the stress of the reservoir is released, and the rock mass subsides and cracks. The cut slag and waste water are discharged through the construction hole together, and the fluid minerals are pumped after the construction is completed.

[0038] The height of the horizont...

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Abstract

The present invention relates to a method for improving low-permeability mineral reservoir, and relates to an imprevement on production method of underground fluid energy source and minerals (such as petroleum, natural gas, coalbed gas, geothermal water). The supporting band is remained between horizontal slot and adjacent slot which are used for treating low-permeability mineral reservior. It utilizes the formula to calculate length, width, height of the horizontal slot and width of supporting band, in the course of drilling it can use water-jet-flow to make horizontal drilling in the reservior. When it is drilled to designed depth, the jet flow direction can be changed to make transverse jet to form horizontal slot in the reservior, so that said method can raise the back production rate of mineral.

Description

technical field [0001] The invention relates to the improvement of mining methods for underground fluid energy and minerals (such as oil, natural gas, coal bed gas, geothermal water, etc.). Background technique [0002] At present, the mining methods of underground fluid minerals in low-permeability mineral reservoirs at home and abroad mainly include: [0003] 1. Borehole drainage method (including dense drilling and reaming method), its drainage effect depends entirely on the characteristics of the mineral reservoir itself, and neither drilling nor reaming can improve the permeability of the reservoir. In many cases, the stress concentration around the borehole will reduce the permeability of the reservoir, that is, form a barrier for fluid minerals to flow to the drainage borehole, affecting the mining of minerals. [0004] 2. Hydraulic fracturing and drainage method (including sand fracturing method, etc.), because only a small crack is formed in the reservoir when high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/25
Inventor 赵阳升胡耀青冯增朝段康廉张明安郝建国杨栋范世民翟路锁
Owner TAIYUAN UNIV OF TECH
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