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Ground pregrouting material prepared from waste drilling slurry

A waste mud and pre-grouting technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of large floor area, environmental pollution, and unsatisfactory curing effect, so as to reduce the amount of mud production and ease Great pressure, the effect of reducing emissions

Active Publication Date: 2010-04-21
BEIJING CHINA COAL MINE ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the treatment of waste drilling mud at home and abroad is generally consolidated first, and then comprehensive utilization is considered, but it is still in the experimental stage and does not have the conditions for large-scale industrial comprehensive utilization; nor has a special consolidation treatment for waste drilling mud been developed. Materials, mud curing treatment uses solid materials for clay and industrial sludge, and the curing effect is not ideal
The treatment method of waste mud in my country is mainly direct discharge, which takes a long time to discharge (usually several years or even decades), covers a large area, and causes serious environmental pollution problems

Method used

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  • Ground pregrouting material prepared from waste drilling slurry
  • Ground pregrouting material prepared from waste drilling slurry
  • Ground pregrouting material prepared from waste drilling slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Drilling mud is taken from the westerly well of Zhangbei Coal Mine in Huainan, with a dilution specific gravity of 1.16 and a funnel viscosity of 18.91s. Under the test condition of 25°C, add drilling waste mud into the mixing pot of the cement mortar mixer, select a low speed and turn on the stirring pot, add calcium chloride solution, stir for 1 minute, add cement and stir for 3 minutes, then add structural additives, low speed After stirring for 1 min, the viscosity of the prepared slurry was measured with a funnel viscometer. During the slurry preparation process, the mixer has been in a low-speed stirring state. Considering the dilution effect of the calcium chloride solution, the same amount of water was used as a comparative test. According to the performance of the grouting material in "Coal Mine Grouting Technology" and the commonly used test methods, the funnel viscosity of the grout is measured. The test ratio and measurement results are shown in...

Embodiment 2

[0025] Embodiment 2: According to the experimental method of embodiment 1, the experiment was carried out with the drilling mud of the main shaft of the No. 2 Yuandian Coal Mine in Huaibei. The specific gravity dilution of the drilling mud is 1.21, and the measured funnel viscosity is 19.44s. Viscosity measurement is shown in Table 2, 24h plastic strength growth trend of slurry figure 2 shown.

[0026] Calcium Chloride Reduced Viscosity Determination Table Table 2

[0027]

[0028] The slurry prepared with the drilling mud of the main well of Yuandian No. 2 Mine in Huaibei, after adding calcium chloride, the plastic strength of the slurry can reach 50KPa in 18h-22h, which can meet the water shutoff requirements. Through the viscosity-reducing effect of calcium chloride, the grouting material prepared with the waste drilling mud meets the ground pre-grouting requirements.

Embodiment 3

[0029] Example 3: still according to the experimental method of Example 1, the experiment was carried out with the drilling mud from the gangue well of Zhujixi Mine in northern Anhui. The specific gravity dilution of the drilling mud is 1.13, and the measured funnel viscosity is 22.13s. Viscosity measurement is shown in Table 3, the plastic strength growth trend of the slurry at 24 hours image 3 shown.

[0030] Calcium Chloride Reduced Viscosity Determination Table Table 3

[0031]

[0032] After adding calcium chloride to the slurry prepared from the drilling mud of gangue wells in Zhujixi Mine in northern Anhui, the plastic strength of the slurry can reach 50KPa at 14h, 18h and 22h respectively, which can meet the water shutoff requirements. Through the viscosity-reducing effect of calcium chloride, the grouting material prepared with the waste drilling mud meets the ground pre-grouting requirements.

[0033] In the above embodiment, the cement mortar mixer is JJ-5 ty...

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Abstract

The invention discloses a ground pregrouting material prepared from waste drilling slurry. The ground pregrouting material consists of a ground pregrouting solution prepared from the waste drilling slurry and a calcium chloride solution; the ground pregrouting solution consists of the waste drilling slurry, cement and a structural additive, the volume of the structural additive accounts for 1 to 3 percent of that of the ground pregrouting solution, the concentration of the cement is between 0.1 and 0.2g / mL, and the balance is the drilling slurry; and the volume ratio of the ground pregrouting solution to the calcium chloride solution is 1,000:(5-17). The ground pregrouting material has the advantages of reducing the emission of the waste slurry and reducing the slurry yield of clay suspension during the grouting.

Description

Technical field: [0001] The invention relates to a ground pre-grouting material used in the field of coal mines, in particular to a ground pre-grouting material prepared with drilling waste mud. Background technique: [0002] Clay cement grouting technology has been widely used in the shaft construction of coal mines in my country because of its low cost, high construction efficiency, and good water blocking effect. At present, more than 80 wellbores in my country have adopted clay cement grouting technology, and the injection volume of clay slurry as the main component has reached 1,000,000m 3 about. The construction of mine shafts in my country is developing towards the direction of 1,000-meter-deep wells, which requires a large amount of clay grouting materials, which will further destroy precious land resources; and in areas with less clay resources, the application of clay cement grouting technology also restricted. [0003] Drilling method is a reliable construction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
Inventor 宋雪飞徐润王正胜周兴旺陈振国左永江丁振宇肖炜
Owner BEIJING CHINA COAL MINE ENG CO LTD
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