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Treatment method of waste slurry generated by gigging well and drilling

A treatment method and technology for waste mud, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of small treatment capacity, waste of land resources, surface soil, groundwater pollution, etc., achieve large treatment capacity, reduce treatment costs, The effect of solving the pollution problem

Active Publication Date: 2010-07-14
PUYANG TIANDIREN ENVIRONMENTAL PROTECTION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional disposal method is to store in storage pools, dry naturally, and transfer to the sea. This not only takes up a lot of land resources, but also pollutes surface soil and groundwater if the landfill does not meet the requirements. The scope of pollution continues to expand, and the hidden dangers of pollution are relatively large
Over the years, technical researchers at home and abroad have done a lot of research on the treatment of waste mud, such as the research and application of drilling waste mud treatment technology, waste mud water and soil separation method and its device, research on flocculation in mud water and soil separation, etc. , are all pretreatment landfills, most of the landfills do not meet the requirements, and waste land resources; the method of solidification landfill is to add a large amount of curing agent to the waste drilling mud to absorb the water and bury it on the spot. Greatly increased the total amount of waste and the cost of comprehensive utilization, and the leachate of waste after burial will still cause serious pollution to groundwater
Prior to this, the applicant applied for an invention patent "A Method for Recycling Oilfield Waste Sludge and Oil Sludge (ZL200610018062.0)", which is a treatment method for drilling mud in oil and gas fields. There are limitations in the treatment of well drilling waste mud, and the treatment cost is relatively high

Method used

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  • Treatment method of waste slurry generated by gigging well and drilling

Examples

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Comparison scheme
Effect test

Embodiment 1

[0022] As shown in the attached figure, a treatment method for waste mud from sinking and drilling: the 1000m 3 Sinking and drilling waste mud is sent to the vibrating screen with spraying device, rinsed with water, liquid debris is separated and desanded, and the obtained sand (particle size ≥ 1mm) is recycled and reused as building materials. After desanding, the waste drilling and drilling mud is Enter the mud collection tank or mud pool, part of it is returned to the well for reuse, and the remaining drilling waste mud enters the static mixer, adds inorganic flocculant and water to dilute and stir to break down and obtain mud with a solid content of ≤20% (weight). Water, and then the obtained mud water is sent to the static mixer through the lifting booster pump (0.5MPa) and polyacrylamide flocculant is added, stirred, and the mud destabilization reaction is carried out at normal temperature and pressure. After the mud destabilization reaction is completed, Slurry water is...

Embodiment 2

[0025] It is basically the same as that of Example 1, except that the disposal amount of waste mud from sinking and drilling in the well is 900m 3 ;The cyclone centrifuge separation device is used for the separation of liquid debris; when adding inorganic flocculant and water to the waste drilling mud after sand removal, diluting and stirring to obtain mud water with a solid content of ≤20%, and mud destabilization reaction All completed in the mixing tank; lifting booster pump (0.3MPa); booster pump (0.2MPa); three parallel-connected screw filters are used for solid-liquid separation; the dosage of quicklime is per cubic meter of drilling waste Add 40kg to the mud, and the dosage of aluminum sulfate is 20kg per cubic meter of drilling waste mud; the polyacrylamide flocculant is cationic polyacrylamide, and the dosage of the aqueous solution of 2% cationic polyacrylamide is per cubic meter of drilling mud Add 20Kg of drilling waste mud; add inorganic flocculant and water to di...

Embodiment 3

[0027] It is basically the same as that of Example 1, except that the disposal amount of waste mud from sinking and drilling in the well is 800m 3 ; Lifting booster pump (0.2MPa); Booster pump (0.3MPa); A centrifuge is used for solid-liquid separation; the dosage of quicklime is 25kg per cubic meter of drilling waste mud, and the dosage of aluminum sulfate Add 20kg per cubic meter of drilling waste mud; polyacrylamide flocculant is anionic polyacrylamide, and the dosage of 2% weight concentration anionic polyacrylamide aqueous solution is 10kg per cubic meter of drilling waste mud; add inorganic When diluting the flocculant with water and stirring when adding polyacrylamide flocculant, the stirring speed is 50rpm, and the stirring time is 20min. The whole process takes about 45 minutes to complete.

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Abstract

The invention discloses a treatment method of waste slurry generated by gigging a well and drilling, which comprises the following steps of: separating liquid from scraps to remove sands in waste slurry which is generated by gigging a well and drilling and is reflowed from the well; adding inorganic flocculating agent and water in the sanded-removed waste slurry generated by gigging the well and drilling to dilute, stir and damage stability to obtain cement paste with solid content which is less than or equal to 20%; adding polyacrylamide flocculant into the obtained cement paste to stir and perform a cement paste destabilization reaction; after the cement paste destabilization reaction, separating solid from liquid in the cement paste; and returning filter water to the step of separating liquid from scraps to remove the sands as cleaning proportioned water to recycle and / or return to the step of diluting, stirring and damage stability as water for treating and diluting the cement paste. The method can solve the problem for treating and using the waste slurry generated by gigging the well and drilling, can separate sands from mud and water in the waste slurry generated by gigging the well and drilling, can reach the standard and be comprehensively utilized, has large treatment amount to reach 1000 m<3> / h, can treat the waste slurry on a large scale, thereby being capable of reducing the treatment cost of the system. The method can comprehensively utilize and recycle all the waste slurry generated by gigging the well and drilling.

Description

technical field [0001] The invention relates to a treatment method for drilling waste mud. Background technique [0002] Sinking and drilling waste mud is a waste liquid with high viscosity and high solid content produced during the process of high-rise buildings, bridge piling, well sinking, shield construction or gas field drilling (well). It is made of clay (bentonite) ), drill cuttings, and water are a stable colloidal dispersion system that has the characteristics of high suspended solids, high viscosity, and neutral or alkaline pH value. The thixotropic and colloidal properties of the mud make the mud stay Exposure to the natural environment can not be dry, solidified. Due to the huge amount of production, the storage occupies a large amount of land and wastes precious land resources. Direct discharge will cause river channel silting, water pollution, and may even cause pollution accidents. With the increasingly stringent national and local environmental protection r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 丁明郭学峰郑翔鲲马进王珍茆明军荣怀宇付新鹏蔡鑫
Owner PUYANG TIANDIREN ENVIRONMENTAL PROTECTION TECH CO LTD
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