EP3774096A1 - Procédé de neutralisation et dispositif de neutralisation de déchets de forage de puits - Google Patents

Procédé de neutralisation et dispositif de neutralisation de déchets de forage de puits

Info

Publication number
EP3774096A1
EP3774096A1 EP19781306.6A EP19781306A EP3774096A1 EP 3774096 A1 EP3774096 A1 EP 3774096A1 EP 19781306 A EP19781306 A EP 19781306A EP 3774096 A1 EP3774096 A1 EP 3774096A1
Authority
EP
European Patent Office
Prior art keywords
sludge
drilling
cells
pit
per
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19781306.6A
Other languages
German (de)
English (en)
Other versions
EP3774096A4 (fr
Inventor
Mikhail Ivanovich Serdyuk
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP3774096A1 publication Critical patent/EP3774096A1/fr
Publication of EP3774096A4 publication Critical patent/EP3774096A4/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/08—Reclamation of contaminated soil chemically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/06—Arrangements for treating drilling fluids outside the borehole
    • E21B21/068—Arrangements for treating drilling fluids outside the borehole using chemical treatment

Definitions

  • the group of inventions relates to neutralization of drilling wastes and can be used for disposal of drill cutting wastes when drilling deep wells of various purpose.
  • a method for neutralization of well drilling wastes is known from RF Patent for Invention No. 2213121, said method comprising sludge pit reclamation, including evacuating the liquid phase of waste drilling fluid from the pit, eliminating the fluidity of its coagulates, filling the remaining drilling wastes with mineral soil, and site levelling. Before the evacuation, contaminant concentrations are determined in waste drilling fluid, and the content of contaminants in the fluid is brought to levels below maximum allowable concentrations.
  • the liquid phase is evacuated from the sludge pit through a sludge pit dike opening.
  • a waste drilling sludge neutralization method is known from RF Patent for Invention No. 2486166, said method comprising the preparation of a process area, collection, excavation and delivery of contaminated soils to the process area, preparation of oil-contaminated soil, application of a humic mineral complex and provision of oil-contaminated soil biostructuring processes.
  • the method for waste drilling sludge neutralization includes liming, chemical coagulation, application of flocculants and a humic mineral complex, step-by-step removal of drilling sludge to a buffer layer with laying of drilling sludge to a maximum layer of 8-10 cm, drying of drilling sludge, and stockpiling for further disposal.
  • the humic mineral complex is obtained in the course of low-temperature mechanochemical extraction of humic acids by disintegration of brown coal in a disperser with mixing of the crushed brown coal with alkali.
  • a disadvantage of the analogs described above consists in the lack of the guaranteed high-quality treatment of the entire drilling sludge volume contained in a sludge pit, in any part thereof - in the corners, on the bottom, etc., both to a sufficient degree of chemical treatment with reagents and a sufficient degree of mechanical mixing, with regard to both duration and intensity, as a result, eliminating undermixed areas in any segment of the sludge pit.
  • the method includes separation of drilling sludge from the drilling fluid circulating in the drilling process, and storage of drilling sludge in sludge pits.
  • the drilling sludge is processed into a sludge semi-product which is supplemented with humic mineral concentrate as a composite mixture modifier, and the territories of all soil excavations for placement of neutralized drilling products are returned into land circulation.
  • Sludge pits are constructed as several temporary operative parallel pits, each of them receiving sludge from drilling of different rock strata alternately penetrated by a drilling tool.
  • a process station in the form of several parallel basins is provided to obtain an end product, and ameliorant maturation is arranged in each of them on a rotating basis.
  • a disadvantage of the closest analog consists in an increase of exposed disturbed lands needed for arrangement of several earth drilling pits, i.e. efforts toward rehabilitation of contaminated territories lead to even greater disturbed areas where earth pits, basins, sumps, etc. are provided for storage and further maturation of drilling sludges, more precisely, their substances. And, despite the fact that it is planned to temporarily occupy these work areas for cleaning and treatment of sludges, the time of such actions may, however, significantly extend for various reasons - climatic, financial, organizational ones (for example, for the reason of insufficient quantity of additional chemicals because it is necessary to treat the constructed pits themselves as well, rehabilitate them and return them into land circulation).
  • a neutralization device is known from RF Useful Model Patent No. 71115.
  • the device consists of a body and a sludge loading tank.
  • the body is divided by a partition into two chambers: a collection chamber and a water separation chamber, and is equipped on the bottom with a removable tray and nozzles for water draining.
  • the sludge loading tank is located in the collection chamber, installed on a frame, provided with a cover, and made of metal mesh in such a way to create a channel for steam passage inside the tank.
  • the body is equipped with a bell connected with the tank bottom to provide capability for steam injection into the tank.
  • a drilling sludge neutralization device is known from RF Useful Model
  • Patent No. 142084. The device consists of a tank provided with a vibrating bottom. Inside the tank, there is a sieve equipped with floats to provide capability for sieve movement in vertical direction within the tank; there is a pump inside the sieve. To create vibration waves, the tank is provided with an ultrasonic vibrator and an ultraviolet radiator.
  • the closest analog of the claimed device is the technical solution described in RF Useful Model Patent No. 170033.
  • the device represents a mobile range formed by a set of the equally shaped and sized leak-proof tanks which are interconnected by sealing and, at the same time, coupling members of straight, angular and other shapes.
  • Each of the tanks in the version shown in the patent has the shape of an inverted truncated pyramid.
  • Each tank includes a bottom and side walls. These specially prepared tanks are delivered to the site intended for accumulation, placement and further disposal.
  • the claimed mobile range is a set of the inserts that represent leak-proof tanks, and it just acts as a container with drilling sludge, where, at best, drilling mass matures with the use of chemicals.
  • a disadvantage of the closest analog consists in its crude design which is not sufficient for implementing the efficient process of drilling sludge treatment, for example, using a stirring device, such as an agitator.
  • a stirring device such as an agitator.
  • the presence of a bottom drastically complicates the process of removing the tanks with drilling sludge from the sludge pit after the sludge is ready.
  • the object of the claimed group of inventions is to ensure improvement in the quality of treated drilling sludge neutralization to levels below maximum allowable concentrations by means of the claimed method with reduced treatment time.
  • drilling sludge dividers inside the sludge pit, which are represented by a metal fixture in the form of bottomless cells placed and fixed, at least in their upper part; drilling sludge is individually discharged into the formed cells, each being filled to about 80% by volume; chemical and technological treatment, including treatment with a humic mineral component, is performed in a batchwise manner - individually in each of the cells with constant stirring; the humic mineral component is injected in the amount of about 3-5% of the total drilling sludge quantity and stirred within 30-60 minutes; significant parameters are checked until values below maximum allowable concentrations are reached; then the metal fixture is removed from the sludge pit, and soil from the rehabilitated areas is added.
  • drilling sludge dividers inside the sludge pit, which are represented by a metal fixture in the form of bottomless cells placed and fixed, at least in their upper part; drilling sludge is individually discharged into the formed cells, each being filled to about 80% by volume; chemical and technological treatment, including treatment with a
  • a method with the above mentioned operations is also claimed in which stirring is provided at a rate of about 30-60 revolutions per minute.
  • a method is also claimed in which treatment in each of the cells is performed in a sequential order.
  • a method is also claimed in which, along with the features described above, batchwise treatment in multiple cells is performed at the same time.
  • the well-drilling waste neutralization device is represented by dividers in the form of a metal fixture which can be installed inside a sludge pit to create a structure with vertically oriented bottomless cells covered on top with a metal grid where guides are provided in the form of rails with a working platform moving along them with an operator's workplace and with capability for placing chemicals and drilling sludge stirring equipment on it.
  • a device is also claimed in which, along with the features described above, the guides have working platform end stops along the perimeter of the grid to avoid working platform sliding off.
  • a device is also claimed in which a protective cover is provided on the metal grid over the top surface of the sludge pit to avoid climatic effects on the interior space of the pit.
  • a device is also claimed in which, along with the features described above, the cells in their upper plane have a size of 2 c 2 m.
  • a device is also claimed in which a controller with a control panel is
  • the technical result of the claimed group of inventions is achieved by introducing a new operation (in the method) that has an influence on the rest of the process of drilling sludge treatment, from the beginning to the very end.
  • the method can be implemented by both sequential treatment of sludge in each of the cells and simultaneous parallel treatment using any properly sized mechanical, vibrating and ultrasonic agitators, etc. in multiple cells at the same time.
  • This mode is reasonable, for example, if contractors have the sufficient quantity of connected stirring means and cells and there is a lack of climatic conditions suitable for performing operations (before an expected snowfall or incessant rains). In such a case, preference is given to a somewhat more costly mode that not only guarantees the quality of cleaning and neutralization, but also ensures that the operations will be completed before the extreme conditions occur, which is important in the conditions of the North or areas with the increased amount of precipitation.
  • the optimally selected mode of action - stirring within 30-60 minutes, and a humic mineral component in the amount of about 3-5% of the total drilling sludge quantity provide guaranteed quality up to the achievement of values below maximum allowable concentrations.
  • the visual check of the sludge material color change from stage to stage suggests the treatment readiness time at each specific stage and allows considering the changing color of sludge as a criterion of readiness to the next action stage.
  • the instrumental check with the use of indicating sensors is more accurate along with comparing samples with computer library reference standards.
  • the technical result of the claimed drilling sludge neutralization method providing a capability for the visual check of readiness of each batch to the next stage of processing the drilling sludge, which undergoes changes in the course of treatment, makes it possible to eliminate the unnecessary action time and save the resources spent. On the other hand, eliminating the excess of chemicals and changing the action time prevent from drilling sludge treatment quality
  • the claimed method corresponds to the high level of the claimed technical solution in this area and is suitable for industrial use with significant saving of costs without product quality deterioration.
  • the claimed device is explained using the Fig. schematically showing a sludge pit with already installed cells, guides and a working platform.
  • the quantity of cells is calculated.
  • the dividers in the form of a metal fixture which have been previously delivered to the sludge pit, are installed using a crane into the sludge pit which is empty or filled with drilling sludge.
  • Bottomless cells 1 formed as a result of metal fixture installation are interconnected by fasteners to provide additional structural stability and strength.
  • the sludge level in each of cells 1 is checked; each cell shall be filled to about 80% by volume.
  • Metal grid 2 is installed onto bottomless cell 1 at the upper base; guides in the form of rails 3 with working platform 4, where an operator's workplace is provided, are mounted on grid 2. To ensure control over the sufficient injection of chemicals, stirring and neutralization, the device is provided with a control panel and a controller. The guides along the perimeter of grid 2 are provided with working platform end stops, and there are retainers along the guides, allowing for stopping the working platform. There is an additional element, a metal cover, designed to avoid climatic effects on the interior space of the sludge pit. The cover is installed after working platform removal and work completion for some time or after the completion of sludge treatment in the pit. The recommended size of cells in their upper plane is 2 c 2 m. A cell height in the invention embodiment example is 2.5 m.
  • stirring device There may be more than one stirring device, depending on the required drilling sludge processing rate in general.
  • the neutralization of drilling sludge is based on chemical and technological treatment by adding various chemicals into it with their thorough stirring.
  • the overall technological process of drilling sludge neutralization is the same in each cell.
  • a humic mineral component is added into the drilling sludge placed into cells and treated using any existing technique.
  • the drilling sludge is mixed with the humic mineral component using an agitator with the required power rating to provide stirring at 30-60 revolutions per minute.
  • the calculated amount of the chemicals used, including the humic mineral component is dosed and delivered to a cell with an activated agitator; then it is filled into the cell.
  • the amount of the filled humic mineral component is equal to 3-5% of the weight of drilling sludge in the cell.
  • the stirring time is 30-60 minutes.
  • An agitator with two propeller-type blades located perpendicular to each other and providing the counter-stirring of the reaction mass has proved itself in the example of practical approval.
  • the end of stirring is checked visually by complete distribution of the humic mineral component in the reaction mass.
  • a product is formed at the end of this stage.
  • a composited sample is taken and prepared in compliance with regulatory documents. This sample is analyzed for compliance with the existing requirements. If the sample complies with them, the product in the sludge pit is mixed with the soil produced as a result of sludge pit excavation at the product/soil ratio of 1:1. The result is a soil/sludge mixture. If the sample does not comply with the existing standards, the process of treatment with the humic mineral component is continued until the product with concentrations not higher than maximum allowable values is obtained.
  • the special fixture bottomless cells
  • the side waterproofing layer of the sludge pit is also dismantled and removed from the sludge pit.
  • the product is mixed with soil using construction machinery, such as
  • a moist soil/sludge mixture is formed as a result of mixing.
  • the end of the technological process is visually checked by the formation of the uniform and evenly colored mixture.
  • the dry soil/sludge mixture is produced from the moist soil/sludge mixture as a result of natural processes of water evaporation within 10-20 days at ambient temperature within 20-25 °C and normal air humidity.
  • the obtained dry soil/sludge mixture is used as man-made soil for sludge pit backfilling on site in the field with levelling of the terrain.
  • the dry soil/sludge mixture is flattened using special machinery, and the top soil removed when the sludge pit was excavated is replaced; it is subsequently sown with herbs, planted with trees and shrubs and returned to the agricultural use.

Landscapes

  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Soil Sciences (AREA)
  • Treatment Of Sludge (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

Un procédé de neutralisation de déchets de forage de puits selon l'invention comprend la séparation de boues de forage du fluide de forage, l'évacuation de boues de forage dans une fosse à boues, le traitement chimique et technologique des boues jusqu'à l'obtention d'un mélange composite comprenant entre autres un composant minéral humique ; l'installation de séparateurs de boues de forage représentés par un appareil métallique sous la forme de cellules sans fond placées et fixées, au moins dans leur partie supérieure ; l'évacuation de boues de forage dans les cellules formées, chacune étant remplie à hauteur de 80 % en volume. Le traitement chimique et technologique est effectué de manière discontinue individuellement dans chacune des cellules sous agitation constante. Le composant minéral humique est injecté à hauteur d'environ 3 à 5 % de la quantité totale de boues de forage et agité pendant 30 à 60 minutes. Des paramètres significatifs sont vérifiés jusqu'à ce que des valeurs inférieures à des concentrations maximales admissibles soient atteintes. L'appareil est retiré de la fosse, et le sol provenant des zones réhabilitées est ajouté. Le dispositif de neutralisation de déchets de forage de puits est constitué de séparateurs sous la forme d'un appareil métallique destiné à être installé à l'intérieur d'une fosse à boues pour créer une structure ayant des cellules sans fond orientées verticalement, une grille métallique étant installée au-dessus de l'appareil. Des guides sous la forme de rails sont disposés sur la grille conjointement avec une plate-forme de travail se déplaçant le long de ceux-ci. La grille a un poste de travail d'opérateur et permet de placer des produits chimiques et un équipement d'agitation de boues de forage. L'utilisation du groupe d'inventions revendiqué garantit l'amélioration de la qualité de boues de forage neutralisées.
EP19781306.6A 2018-04-03 2019-04-01 Procédé de neutralisation et dispositif de neutralisation de déchets de forage de puits Pending EP3774096A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2018111797A RU2679056C1 (ru) 2018-04-03 2018-04-03 Способ обезвреживания отходов бурения скважин и устройство для обезвреживания
PCT/RU2019/000206 WO2019194705A1 (fr) 2018-04-03 2019-04-01 Procédé de neutralisation et dispositif de neutralisation de déchets de forage de puits

Publications (2)

Publication Number Publication Date
EP3774096A1 true EP3774096A1 (fr) 2021-02-17
EP3774096A4 EP3774096A4 (fr) 2021-06-23

Family

ID=65273520

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19781306.6A Pending EP3774096A4 (fr) 2018-04-03 2019-04-01 Procédé de neutralisation et dispositif de neutralisation de déchets de forage de puits

Country Status (4)

Country Link
EP (1) EP3774096A4 (fr)
EA (1) EA037837B1 (fr)
RU (1) RU2679056C1 (fr)
WO (1) WO2019194705A1 (fr)

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3742948C1 (de) * 1987-12-18 1989-01-26 Gerling Inst Pro Schadenforsch Verfahren zur Entfernung und zur qualitativ-analytischen Bestimmung von Cyanid in verunreinigten Boeden
RU2162918C1 (ru) * 1999-07-14 2001-02-10 Дочернее открытое акционерное общество "ВолгоградНИПИнефть" Способ ликвидации земляного амбара-накопителя отходов бурения
US8100198B2 (en) 2007-03-23 2012-01-24 M-I L.L.C. Cuttings treatment and reuse
RU71115U1 (ru) 2007-08-22 2008-02-27 Государственное образовательное учреждение высшего профессионального образования "Тюменский государственный нефтегазовый университет" Установка для очистки нефтяного шлама
RU2392256C1 (ru) * 2008-12-01 2010-06-20 Анна Витальевна Бородай Способ обезвреживания отходов бурения нефтяных и газовых скважин
RU2439098C2 (ru) 2010-02-24 2012-01-10 Государственное образовательное учреждение высшего профессионального образования "Санкт-Петербургский государственный горный институт имени Г.В. Плеханова (технический университет)" Способ утилизации бурового шлама
RU2428256C1 (ru) 2010-03-05 2011-09-10 Павел Васильевич Беседин Способ управления процессом мокрого самоизмельчения шлама в мельничном агрегате
RU2425815C1 (ru) 2010-07-05 2011-08-10 Общество с ограниченной ответственностью Научно-производственное предприятие "Союзгазтехнология" Способ утилизации отходов бурения скважин
RU2508170C1 (ru) 2012-06-19 2014-02-27 федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тюменский государственный университет" Способ утилизации буровых отходов
RU2524708C1 (ru) 2013-02-19 2014-08-10 Юрий Яковлевич Эль Способ переработки бурового шлама
RU2528035C1 (ru) 2013-02-25 2014-09-10 Общество с ограниченной ответственностью "Актуальные технологии нефтеотдачи" (ООО "АТН") Способ утилизации бурового шлама
RU2539470C1 (ru) 2013-09-16 2015-01-20 Открытое акционерное общество "Самотлорнефтегаз" Способ рекультивации бурового шламового амбара
RU142084U1 (ru) 2014-02-07 2014-06-20 Владимир Петрович Сивков Устройство для обработки отработанного бурового раствора и шлама
RU2572763C1 (ru) 2014-07-03 2016-01-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тюменский государственный архитектурно-строительный университет" Способ утилизации буровых шламов
RU2595172C1 (ru) 2015-02-25 2016-08-20 Федеральное государственное бюджетное образовательное учреждение высшего образования "Тюменский индустриальный университет" Способ утилизации буровых шламов
CN205422596U (zh) 2016-03-24 2016-08-03 巴州纯源科技有限责任公司 一种钻井废弃泥浆处理的化学处理罐
CN105950165B (zh) * 2016-05-11 2019-08-09 山东省农业科学院农业资源与环境研究所 一种铬污染土壤修复改良剂及其修复方法
RU170033U1 (ru) 2016-10-05 2017-04-12 Владимир Алексеевич Перминов Шламовый амбар
RU2631681C1 (ru) 2017-03-10 2017-09-26 Федеральное государственное бюджетное образовательное учреждение высшего образования "Тюменский индустриальный университет" (ТИУ) Способ утилизации бурового шлама при производстве техногенного грунта

Also Published As

Publication number Publication date
RU2679056C1 (ru) 2019-02-05
WO2019194705A1 (fr) 2019-10-10
EA037837B1 (ru) 2021-05-26
EA202092079A1 (ru) 2020-11-16
EP3774096A4 (fr) 2021-06-23

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