Solidification method of rejected well drilling liquid

A technology of waste drilling fluid and solidification method, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of polluting the environment, large area of ​​waste drilling fluid, etc., and achieve the effect of increasing strength and tight integration

Inactive Publication Date: 2008-04-23
BEIJING CHINA COAL MINE ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of large area occupied by waste drilling fluid in coal mine drilling and environmental pollution in the prior art. The present invention provides a solidification method for waste drilling fluid. The waste drilling fluid treated with the curing agent can save a lot of waste Land, and will not affect groundwater and surrounding crops, can produce obvious environmental benefits, economic benefits and social benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1, add 5.8 parts by weight of cement and 1.75 parts by weight of water glass in 100 parts by weight of waste drilling fluid, stir evenly, stack up, treat that waste drilling fluid is solidified after 24 hours, and the compressive strength in 7 days is 0.12 MPa, 24h penetration is 5mm, 48h penetration is 1.4mm; 0.42 parts by weight of CaO or Al can be added to the above waste drilling fluid 2 (SO 4 ) 3 , or NaCl, stir evenly, stack them up, and wait for 24 hours to solidify the waste drilling fluid. The 7-day compressive strength is 0.13MPa, the 24-hour penetration is 4.8mm, and the 48-hour penetration is 1.3mm.

Embodiment 2

[0017] Embodiment 2, add 10.8 parts by weight of cement and 2.9 parts by weight of water glass in 100 parts by weight of waste drilling fluid, stir evenly, stack up, treat that waste drilling fluid is solidified after 24 hours, and the compressive strength in 7 days is 0.4 MPa, the penetration of 24h is 2.1mm, and the penetration of 48h is 0.3mm; 1.25 parts by weight of CaO or Al can be added to the above waste drilling fluid 2 (SO 4 ) 3 , or NaCl, stirred evenly, stacked up, and after 24 hours, the waste drilling fluid was solidified. The compressive strength was 0.42MPa at 7 days, the penetration at 24h was 2mm, and the penetration at 48h was 0.2mm.

Embodiment 3

[0018] Embodiment 3, add the cement of 7 weight parts and the water glass of 1.9 weight parts in the waste drilling fluid of 100 weight parts, carry out stirring evenly, pile up, treat that waste drilling fluid is solidified after 24 hours, 7 days compressive strength is 0.3 MPa, the penetration of 24h is 4mm, and the penetration of 48h is 1.3mm; 0.8 parts by weight of CaO or Al can be added to the above waste drilling fluid 2 (SO 4 ) 3 , or NaCl, stir evenly, stack them up, wait for 24 hours to solidify the waste drilling fluid, the 7-day compressive strength is 0.31MPa, the 24-hour penetration is 3.8mm, and the 48-hour penetration is 1.28mm.

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Abstract

The present invention relates to a method for solidifying waste drilling fluid. It is characterized by that in the waste drilling fluid with a certain weight the cement and water glass are added according to their weight mixing ratio of 100 portions of waste drilling fluid, 5.8-10.8 portions of cement and 1.75-2.9 portions of water glass.

Description

Technical field: [0001] The invention relates to a method for solidifying additives used in the field of coal mine drilling, in particular to a method for solidifying waste drilling fluid. Background technique: [0002] Coal mine vertical shaft drilling will produce a large amount of waste drilling fluid. Each well will generate approximately 30,000 to 40,000 cubic meters of waste drilling fluid, which will be discarded at the well site after completion. The main shaft of Rulonggu Mine has a drilling depth of 582.75m, a drilling diameter of 8.7m, and a maximum circulating drilling fluid volume of 35,000m 3 ; If the depth of the storage pool is 3m, the waste drilling fluid will occupy an area of ​​12,000m 2 about. The main components of drilling fluid are clay, water, various chemical additives, etc., and contain various pollutants such as alkali, salt, organic matter and cuttings. At present, the waste drilling fluid is mainly piled up in the pre-dug soil pit on the well s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/02A62D3/00
Inventor 孙建荣王晓建李功洲王新李英全程守业
Owner BEIJING CHINA COAL MINE ENG CO LTD
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