WO2007102743A1 - A treatment method for drill cuttings from petroleum wells - Google Patents

A treatment method for drill cuttings from petroleum wells Download PDF

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Publication number
WO2007102743A1
WO2007102743A1 PCT/NO2007/000090 NO2007000090W WO2007102743A1 WO 2007102743 A1 WO2007102743 A1 WO 2007102743A1 NO 2007000090 W NO2007000090 W NO 2007000090W WO 2007102743 A1 WO2007102743 A1 WO 2007102743A1
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WIPO (PCT)
Prior art keywords
slurry
mud
waste
petroleum
water
Prior art date
Application number
PCT/NO2007/000090
Other languages
French (fr)
Inventor
Matheus Christensen
Harald Justnes
Original Assignee
Advanced Cuttings Treatment As
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Publication of WO2007102743A1 publication Critical patent/WO2007102743A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/0481—Other specific industrial waste materials not provided for elsewhere in C04B18/00
    • C04B18/049—Wastes from oil or other wells, e.g. drilling mud
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00767—Uses not provided for elsewhere in C04B2111/00 for waste stabilisation purposes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

  • a treatment method for drill cuttings from petroleum wells is provided.
  • the mud comprises heavy minerals such as barite (BaSO 4 ) and ilminite (FeTiO 3 ) as well as other compounds that should not be released into the environment.
  • the mud is usually provided from the drilling installation for circulation from said rig, down into the well, and entrains cuttings from the formation when the well is drilled.
  • the cuttings are continuously sieved and separated from the mud usually but not exclusively by means of shakers and screens. These cuttings may evidently also comprise oil or petroleum residues and there may be a presence of heavy metals due to the equipment or the formations in which drilling has been performed.
  • the returning mixture comprising mud, cuttings and petroleum products should be treated in an appropriate manner so as for avoiding pollution of the environment.
  • Previous treatment methods have included filtering the mixture in order for extracting the maximum amount of mud for reuse, and burning the residue.
  • This has resulted in large CO 2 emissions, and is very costly.
  • There is a high energy requirement when burning the mixture as temperatures up to at least 800°C may be required for adequately treating the waste.
  • the resulting ashes must also be treated before disposal for removal of heavy metals.
  • Another approach to the problem is to allow the mixture to dry for a certain period so as for treating a dried mass presenting fewer problems than the wet mixture.
  • the present invention seeks to overcome at least some of the aforementioned problems and pertains to a method for treating a waste mixture from petroleum exploitation wells by directly encapsulating said waste mixture in a binder material comprising cement and / or pozzolanic materials arranged for securely binding the waste in a material matrix such that an insignificant amount of leaching of environmentally hazardous material from the resulting matrix occurs
  • US6695077 describes a thermal process for treating hydrocarbon-contaminated drill cuttings in which said drill cuttings are mixed with an agglomerate to produce a pre-treatment mixture so as for reducing the emission of vapours from the drill cuttings.
  • US5277519 describes a method for well drilling cuttings disposal in which drilled cuttings are disposed of by solidification by drilling with a drilling fluid containing blast furnace slag.
  • the present invention comprises a method for treating an untreated slurry waste from petroleum activities, said untreated slurry waste comprising drill cuttings, mud and petroleum constituents, wherein said method comprises - adding an anti-retardation agent to said slurry,
  • Fig. 1 is a schematic illustration of the process steps invention, comprising mixing an anti-retardation agent (5) with the slurry waste (1), measuring the water content (WCM) of the slurry waste (1) with said anti-retardation agent (5), and adding a binder material (6) and possibly water in order for forming a settable product (7) having the desired properties.
  • WCM water content
  • the invention comprises a method for the treatment of untreated slurry waste from drilling mud used during petroleum drilling.
  • drilling mud (3) is usually a heavy fluid / slurry and serves amongst other purposes as a lubricant for the drill-bit when boring, for the removal of heat and drill cuttings (2) from bottom of the well, for the chemical balancing of the well, and for the overcoming the hydrostatic pressure within the well.
  • the mud (3) is usually circulated from the rig, or drilling vessel through the drill-string to .
  • the mud (3) carries sand, cuttings (2) and also contains petroleum fluids and other chemicals used.
  • a first filtration of the mud (3) is usually performed top-side on the drilling vessel so as for allowing re-use of a major part of the mud (3).
  • a minor proportion of the mud (3) is usually left mixed with the cuttings (2), and the resulting waste (1) must be treated before being deposited in an environmentally friendly manner.
  • many different kinds of mud (3) may be used, however mud (3) is usually classified in three major classes: Oil-based muds (3), water-based muds (3), and synthetic based muds (3).
  • Muds usually comprise minerals having a high specific density such as barite (BaSO 4 ) or ilmenite (mainly FeTiO 3 ).
  • the entrained minerals may further comprise heavy metals such as Pb, Hg, Cd, Ni, Cr, Cu, Zn etc being potentially environmentally detrimental.
  • the drill cuttings (2) may also comprise heavy metals and may further comprise petroleum products.
  • the resulting mixture is characterised as a slurry waste (1) which usually transported from the drilling vessel to the shore for further treatment or storage.
  • the slurry waste (1) is transformed into a settable product (7) without need for any pre-treatment of the slurry waste (1).
  • the method comprises adding an anti-retardation or hydration promotion agent (5) to the slurry waste (1) at an early stage of the process, so as for inhibiting retardation of the setting of the settable product (7) at a later stage.
  • the anti-retardation agent may according to an embodiment of the invention comprise a cement kiln dust.
  • the anti-retardation agent comprises a calcium salt such as CaCl 2 or Ca(NO 3 ) 2 amongst others.
  • the measurement of the water content of the slurry (4) allows the appropriate addition of binder material (6), and possibly additional required water, to the slurry for encapsulation.
  • An illustration of the process is seen in fig. 1, wherein the measurement of water content is indicated by WCM (Water content measurement).
  • the measurement of the water content may be performed prior to or after the addition of anti-retardation agent.
  • the amount of binder material (6) and / or water to be added to the slurry is determined by the required and desired quality and properties of the resulting settable product (7).
  • a water to cement ratio of about 0.6, however such ratios depend on the properties of the binder material that is used, and also to other process parameters known to the person skilled in the art.
  • the water to cement ratio is usually within the range of about 0.4 to 0.9, wherein a ratio of 0.9 denotes a so-called weak concrete.
  • the properties of the slurry waste may vary upon receipt, it being more or less liquid, in some applications it might not prove necessary to add water at all, but rather solely binder material (6).
  • the addition of the anti-retardation agent (5) may be performed at any stage prior to the addition of the binder material (6).
  • the addition of the anti-retardation agent (5) to the slurry (4) prior to the addition of the binder material (6) allows the anti-retardation agent (5) to be thoroughly mixed with the slurry thus ensuring the appropriate action of the agent (5).
  • the addition of the anti-retardation agent (5) at an early stage allows for the deactivation of the retarding agents comprised in the slurry waste (1) before addition of the binder.
  • the slurry waste (1) may be slightly heated so as for avoiding freezing the slurry waste (1) or for decreasing the viscosity of the slurry waste (1) and facilitating flow depending on local temperature conditions.
  • the slurry is displaced to a mixing tank (33) wherein binding materials (6) are added to the slurry (1) as a function of the measured water content in said slurry. If necessary additional water may also be added in occurrences wherein the slurry (1) is to dry.
  • Said binder material (6) may comprise any form of cementious material such as Portland cement, or other kinds of cement.
  • the mixture of said slurry (1) and said binder material (6) is arranged for forming a settable product (7) wherein said product (7) after setting does not leach hazardous materials from the encapsulated waste into the environment.
  • the water content of said slurry (1) should be measured so as for ascertaining how much binder material (6) and / or water should be added to the slurry in the mixing tank (33). Depending on the desired mechanical and chemical properties of the end product, more or less water may be added to the slurry (1).
  • Other compounds may also be added so as for varying the properties of the settable product (7) amongst said compounds fiber- reinforcements such as non-corroding fibers of for instance polypropylene (PP) or polyacylnitrile (PAN).
  • the slurry (3) to be treated there may be a presence of salts from sea-water or brine formation water, and such salts may incur corrosion of common steel reinforcements often used for reinforcement of concretes.
  • salts from sea-water or brine formation water
  • non-corroding materials will strengthen the resulting settable material with there being less risk of corrosion of the reinforcement.
  • a dispersing agent (8) is added to the slurry so as for dispersing petroleum or oil products either from the mud (3) or from petroleum constituents in the slurry (1).
  • a plurality of dispersing agents may be considered, such as tensides, surfactants or the like, as long as said dispersing agent (8) adequately disperses the organic phase.
  • the dispersion facilitates the encapsulation of the oil or petroleum compounds as no large agglomerations of said compounds remain in the slurry. Such large agglomerations will both hinder the setting of the product (7) and may also result in increased leaching from the product (7).
  • the dispersing agents may also disperse organic compounds of oil based muds and synthetic muds.
  • the settable product (7) may subsequent to the blending of the various binder materials and additives, either be poured directly into forms for shaping, or be stored for later pouring.
  • the shaped materials may be used in various applications such as fish reefs, filler material, construction material, wave breakers or the like.
  • a vegetable oil may be added to the slurry so as for increasing the water repellent properties of the product (7) thus further inhibiting the dissolution of the concrete and leaching of the encapsulated products.
  • the method according to the invention allows the treatment of a large range of different wastes without being required to pre-treat the slurry waste (1). This allows great flexibility in which wastes may be treated.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Structural Engineering (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Fluid Mechanics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Civil Engineering (AREA)
  • Treatment Of Sludge (AREA)

Abstract

A method for treating a slurry waste (1) from drilling activities, said slurry waste (1) comprising drill cuttings (2), mud (3) and possibly petroleum constituents (4), wherein said method comprises the following steps: - determining the water content of said slurry (1), - adding an anti-retardation agent (5) to said slurry (1), - displacing said slurry (1) to a mixing tank (33), - adding a combination of binder materials (6) and, if required, water, to said slurry (1) so as for forming a settable product (7) encapsulating said solids, said mud (3) and said petroleum products (4) such that said solids (2), said mud (3) and said petroleum constituents (4) do not leach into the environment after setting of said settable product (7), wherein said anti-retardation agent (5) promotes setting and /or hardening of said settable product (7).

Description

A treatment method for drill cuttings from petroleum wells.
Introduction
When drilling wells a large amount of drill cuttings must necessarily be produced. These cuttings are in many circumstances considered to be toxic waste due to the presence of heavy metals or other pollutants. When drilling wells for petroleum activities there is usually need for using a heavy liquid / slurry known as mud for balancing the pressure in the well and preventing blow out situations. The mud comprises heavy minerals such as barite (BaSO4) and ilminite (FeTiO3) as well as other compounds that should not be released into the environment. The mud is usually provided from the drilling installation for circulation from said rig, down into the well, and entrains cuttings from the formation when the well is drilled. The cuttings are continuously sieved and separated from the mud usually but not exclusively by means of shakers and screens. These cuttings may evidently also comprise oil or petroleum residues and there may be a presence of heavy metals due to the equipment or the formations in which drilling has been performed. The returning mixture comprising mud, cuttings and petroleum products should be treated in an appropriate manner so as for avoiding pollution of the environment.
Previous treatment methods have included filtering the mixture in order for extracting the maximum amount of mud for reuse, and burning the residue. However this has resulted in large CO2 emissions, and is very costly. There is a high energy requirement when burning the mixture as temperatures up to at least 800°C may be required for adequately treating the waste. The resulting ashes must also be treated before disposal for removal of heavy metals. Another approach to the problem is to allow the mixture to dry for a certain period so as for treating a dried mass presenting fewer problems than the wet mixture. However one has then a need for a quite large amount of space for the drainage of the mixture, and the drained fluids comprising mud, water and petroleum products must also be treated.
The present invention seeks to overcome at least some of the aforementioned problems and pertains to a method for treating a waste mixture from petroleum exploitation wells by directly encapsulating said waste mixture in a binder material comprising cement and / or pozzolanic materials arranged for securely binding the waste in a material matrix such that an insignificant amount of leaching of environmentally hazardous material from the resulting matrix occurs
Background art
There are a large number of patents describing different aspects of the disposal of drill cutting waste. Amongst them are US6706718 and US7118624 that both pertain to a method for making a road base material using treated oil and gas waste material. The material is allowed to be drained for a significant amount of time before being mixed with a binder material such as asphalt, cement or the like and an agglomerate material so as for forming a road base material.
US6695077 describes a thermal process for treating hydrocarbon-contaminated drill cuttings in which said drill cuttings are mixed with an agglomerate to produce a pre-treatment mixture so as for reducing the emission of vapours from the drill cuttings.
US5277519 describes a method for well drilling cuttings disposal in which drilled cuttings are disposed of by solidification by drilling with a drilling fluid containing blast furnace slag.
Short summary of the invention
The present invention comprises a method for treating an untreated slurry waste from petroleum activities, said untreated slurry waste comprising drill cuttings, mud and petroleum constituents, wherein said method comprises - adding an anti-retardation agent to said slurry,
- displacing said slurry to a mixing tank,
- determining the initial water content of said slurry,
- adding binder materials and / or water to said slurry so as for forming a settable product encapsulating said solids, said mud and said petroleum products such that said solids, said mud and said petroleum constituents do not leach into the environment after setting of said settable product, wherein said anti-retardation agent promotes setting and /or hardening of said settable product.
Further advantageous embodiments of the invention will be defined in the attached independent claims.
Figure captions
The attached figure is for illustration purposes solely, and shall not be construed in any way to limit the scope of the invention which shall only be limited by the attached claims.
Fig. 1 is a schematic illustration of the process steps invention, comprising mixing an anti-retardation agent (5) with the slurry waste (1), measuring the water content (WCM) of the slurry waste (1) with said anti-retardation agent (5), and adding a binder material (6) and possibly water in order for forming a settable product (7) having the desired properties.
Embodiments of the invention The invention shall in the hereinafter be described with reference to the figure. The invention comprises a method for the treatment of untreated slurry waste from drilling mud used during petroleum drilling. When drilling wells for use in petroleum exploration or for subterranean extraction of petroleum products use is made of a so-called drilling mud (3). The mud (3) is usually a heavy fluid / slurry and serves amongst other purposes as a lubricant for the drill-bit when boring, for the removal of heat and drill cuttings (2) from bottom of the well, for the chemical balancing of the well, and for the overcoming the hydrostatic pressure within the well. The mud (3) is usually circulated from the rig, or drilling vessel through the drill-string to . the drill bit, and back up through a riser to the drilling vessel. Upon return to the drilling vessel, the mud (3) carries sand, cuttings (2) and also contains petroleum fluids and other chemicals used. As the mud (3) is quite costly, a first filtration of the mud (3) is usually performed top-side on the drilling vessel so as for allowing re-use of a major part of the mud (3). However, a minor proportion of the mud (3) is usually left mixed with the cuttings (2), and the resulting waste (1) must be treated before being deposited in an environmentally friendly manner. According to the art, many different kinds of mud (3) may be used, however mud (3) is usually classified in three major classes: Oil-based muds (3), water-based muds (3), and synthetic based muds (3). The different muds have different properties and present different treatment problems. Previous treatment methods have been proposed for each mud type, but no unified treatment approach has been provided that resolves the problems in a unified manner. Muds usually comprise minerals having a high specific density such as barite (BaSO4) or ilmenite (mainly FeTiO3). The entrained minerals may further comprise heavy metals such as Pb, Hg, Cd, Ni, Cr, Cu, Zn etc being potentially environmentally detrimental. The drill cuttings (2) may also comprise heavy metals and may further comprise petroleum products. The resulting mixture is characterised as a slurry waste (1) which usually transported from the drilling vessel to the shore for further treatment or storage.
In a method according to an embodiment of the invention, the slurry waste (1) is transformed into a settable product (7) without need for any pre-treatment of the slurry waste (1). The method comprises adding an anti-retardation or hydration promotion agent (5) to the slurry waste (1) at an early stage of the process, so as for inhibiting retardation of the setting of the settable product (7) at a later stage. The anti-retardation agent may according to an embodiment of the invention comprise a cement kiln dust. According to an embodiment of the invention, the anti-retardation agent comprises a calcium salt such as CaCl2 or Ca(NO3)2 amongst others. Other anti-retardation agents, also known as set accelerators and hardening accelerators in concrete terminology may be added as would be evident to the person skilled in the art. It has previously been claimed that slurry waste from drilling activities must be filtered and ground before the ground cuttings are encapsulated in a settable matrix. However this results in an expensive treatment of the waste (1). Furthermore, the filtering of the waste requires the treatment of both the filtered or drained mostly liquid product in addition to the mostly solid phase. The present invention renders the grinding and pre-treatment of the slurry waste redundant, and thus provides a simpler, cheaper and more efficient procedure for handling such drilling waste. Thus a major benefit of the method according to the invention is that no liquid waste needs to be treated as it is bound in the final product. The measurement of the water content of the slurry (4) allows the appropriate addition of binder material (6), and possibly additional required water, to the slurry for encapsulation. An illustration of the process is seen in fig. 1, wherein the measurement of water content is indicated by WCM (Water content measurement). The measurement of the water content may be performed prior to or after the addition of anti-retardation agent.
The amount of binder material (6) and / or water to be added to the slurry is determined by the required and desired quality and properties of the resulting settable product (7). In cement applications it is common to use a water to cement ratio of about 0.6, however such ratios depend on the properties of the binder material that is used, and also to other process parameters known to the person skilled in the art. The water to cement ratio is usually within the range of about 0.4 to 0.9, wherein a ratio of 0.9 denotes a so-called weak concrete. As the properties of the slurry waste may vary upon receipt, it being more or less liquid, in some applications it might not prove necessary to add water at all, but rather solely binder material (6).
The addition of the anti-retardation agent (5) may be performed at any stage prior to the addition of the binder material (6). The addition of the anti-retardation agent (5) to the slurry (4) prior to the addition of the binder material (6) allows the anti-retardation agent (5) to be thoroughly mixed with the slurry thus ensuring the appropriate action of the agent (5). The addition of the anti-retardation agent (5) at an early stage allows for the deactivation of the retarding agents comprised in the slurry waste (1) before addition of the binder.
In an embodiment of the invention, the slurry waste (1) may be slightly heated so as for avoiding freezing the slurry waste (1) or for decreasing the viscosity of the slurry waste (1) and facilitating flow depending on local temperature conditions.
The slurry is displaced to a mixing tank (33) wherein binding materials (6) are added to the slurry (1) as a function of the measured water content in said slurry. If necessary additional water may also be added in occurrences wherein the slurry (1) is to dry. Said binder material (6) may comprise any form of cementious material such as Portland cement, or other kinds of cement. The mixture of said slurry (1) and said binder material (6) is arranged for forming a settable product (7) wherein said product (7) after setting does not leach hazardous materials from the encapsulated waste into the environment. In order for producing a settable material having the desired properties, the water content of said slurry (1) should be measured so as for ascertaining how much binder material (6) and / or water should be added to the slurry in the mixing tank (33). Depending on the desired mechanical and chemical properties of the end product, more or less water may be added to the slurry (1). Other compounds may also be added so as for varying the properties of the settable product (7) amongst said compounds fiber- reinforcements such as non-corroding fibers of for instance polypropylene (PP) or polyacylnitrile (PAN). In the slurry (3) to be treated there may be a presence of salts from sea-water or brine formation water, and such salts may incur corrosion of common steel reinforcements often used for reinforcement of concretes. Thus the addition of non-corroding materials will strengthen the resulting settable material with there being less risk of corrosion of the reinforcement.
In an embodiment according to the invention a dispersing agent (8) is added to the slurry so as for dispersing petroleum or oil products either from the mud (3) or from petroleum constituents in the slurry (1). A plurality of dispersing agents may be considered, such as tensides, surfactants or the like, as long as said dispersing agent (8) adequately disperses the organic phase. The dispersion facilitates the encapsulation of the oil or petroleum compounds as no large agglomerations of said compounds remain in the slurry. Such large agglomerations will both hinder the setting of the product (7) and may also result in increased leaching from the product (7). The dispersing agents may also disperse organic compounds of oil based muds and synthetic muds.
The settable product (7) may subsequent to the blending of the various binder materials and additives, either be poured directly into forms for shaping, or be stored for later pouring. The shaped materials may be used in various applications such as fish reefs, filler material, construction material, wave breakers or the like. In an embodiment of the invention, a vegetable oil may be added to the slurry so as for increasing the water repellent properties of the product (7) thus further inhibiting the dissolution of the concrete and leaching of the encapsulated products.
The method according to the invention allows the treatment of a large range of different wastes without being required to pre-treat the slurry waste (1). This allows great flexibility in which wastes may be treated.

Claims

Claims
1. A method for treating a slurry waste (1) from drilling activities, said slurry waste (1) comprising drill cuttings (2), mud (3) and possibly petroleum constituents (4), wherein said method comprises the following steps:
- adding an anti-retardation agent (5) to said slurry (1),
- determining the water content of said slurry (1),
- displacing said slurry (1) to a mixing tank (33),
- adding a combination of binder materials (6) and, if required, water, to said slurry (1) so as for forming a settable product (7) encapsulating said solids, said mud (3) and said petroleum products (4) such that said solids (2), said mud (3) and said petroleum constituents (4) do not leach into the environment after setting of said settable product (7), wherein said anti-retardation agent (5) promotes setting and /or hardening of said settable product (7).
2. A method according to claim 1, in which said mud (3) is oil-based.
3. A method according to claim 1, in which said mud (3) is water-based.
4. A method according to claim 1, in which said mud (3) is synthetic based.
5. A method according to claim 1, wherein said anti-retardation agent (5) comprises cement kiln dust.
6. A method according to claim 1 or 2, wherein said anti-retardation agent (5) comprises one or more calcium salts.
7. A method according to claim 1 or 2, wherein a dispersing agent (8) is added to the slurry so as for dispersing said petroleum products (4) in said slurry (1).
8. A method according to claim 7, wherein said dispersing agent (8) is a surfactant (81).
9. A method according to claim 1, wherein said slurry waste (1) is heated so as for decreasing the viscosity of said slurry waste (1).
10. A method according to claim 1, wherein a fiber-reinforcement is added to the slurry waste (1).
11. A method according to claim 1, wherein a vegetable oil is added to said slurry (1) so as for increasing the water repellent properties of the product (7).
PCT/NO2007/000090 2006-03-08 2007-03-06 A treatment method for drill cuttings from petroleum wells WO2007102743A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NO20061132 2006-03-08
NO20061132 2006-03-08
NO20071218 2007-03-06
NO20071218 2007-03-06

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008127123A1 (en) * 2007-04-16 2008-10-23 Advanced Cuttings Treatment As An integrated device for the treatment of drill cuttings
WO2010147482A1 (en) * 2009-06-18 2010-12-23 Ott Subsea Bag Technology As A method for disposal of drilling waste, contaminated sediments and residual waste and a disposal facility for same
RU2503635C1 (en) * 2012-06-20 2014-01-10 федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тюменский государственный университет" Composite building material
EP2699493A1 (en) * 2011-04-22 2014-02-26 Manno, James, Joseph., Jr. Specialized lined landfill system for the stabilization and containment of drilling wastes and coal combustion residues
US8945443B2 (en) 2011-06-15 2015-02-03 Total Waste Management Alliance Limited Process for utilising waste drill cuttings in plastics
RU2575950C1 (en) * 2014-10-15 2016-02-27 Общество с ограниченной ответственностью "Межрегиональный центр биологических и химических технологий" Composite construction material "gumikom"
RU2629634C1 (en) * 2016-08-03 2017-08-30 Федеральное государственное бюджетное образовательное учреждение высшего образования "Уфимский государственный нефтяной технический университет" Road-building composite material based on drill cuttings
US10161204B2 (en) 2014-10-31 2018-12-25 Canadian Energy Services L.P. Treatment of heavy oil cuttings for disposal
US10472280B1 (en) 2014-05-21 2019-11-12 D-Trace Investments, Llc Drill cuttings with a drying agent
RU2793766C1 (en) * 2022-03-02 2023-04-05 Общество с ограниченной ответственностью "РН-Ванкор" Soil concrete and its applications

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DE3939513A1 (en) * 1989-11-29 1991-06-06 Voss Ludwig Gmbh Co Kg Treating drilling mud used as ballast and non-constructional concrete - by adding cement and allowing the resulting concrete mixt. to set
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Cited By (14)

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Publication number Priority date Publication date Assignee Title
US8109456B2 (en) 2007-04-16 2012-02-07 Advanced Cuttings Treatment As System to accelerate stabilization of drill cuttings
WO2008127123A1 (en) * 2007-04-16 2008-10-23 Advanced Cuttings Treatment As An integrated device for the treatment of drill cuttings
WO2010147482A1 (en) * 2009-06-18 2010-12-23 Ott Subsea Bag Technology As A method for disposal of drilling waste, contaminated sediments and residual waste and a disposal facility for same
US8888671B2 (en) 2009-06-18 2014-11-18 Ott Subsea Bag Technology As Method for disposal of drilling waste, contaminated sediments and residual waste and a disposal facility for same
EP2699493A1 (en) * 2011-04-22 2014-02-26 Manno, James, Joseph., Jr. Specialized lined landfill system for the stabilization and containment of drilling wastes and coal combustion residues
EP2699493A4 (en) * 2011-04-22 2014-11-12 James Joseph Manno Jr Specialized lined landfill system for the stabilization and containment of drilling wastes and coal combustion residues
US8945443B2 (en) 2011-06-15 2015-02-03 Total Waste Management Alliance Limited Process for utilising waste drill cuttings in plastics
RU2503635C1 (en) * 2012-06-20 2014-01-10 федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Тюменский государственный университет" Composite building material
US10472280B1 (en) 2014-05-21 2019-11-12 D-Trace Investments, Llc Drill cuttings with a drying agent
US11667568B1 (en) 2014-05-21 2023-06-06 D-Trace Investments, Llc Drill cuttings with a drying agent
RU2575950C1 (en) * 2014-10-15 2016-02-27 Общество с ограниченной ответственностью "Межрегиональный центр биологических и химических технологий" Composite construction material "gumikom"
US10161204B2 (en) 2014-10-31 2018-12-25 Canadian Energy Services L.P. Treatment of heavy oil cuttings for disposal
RU2629634C1 (en) * 2016-08-03 2017-08-30 Федеральное государственное бюджетное образовательное учреждение высшего образования "Уфимский государственный нефтяной технический университет" Road-building composite material based on drill cuttings
RU2793766C1 (en) * 2022-03-02 2023-04-05 Общество с ограниченной ответственностью "РН-Ванкор" Soil concrete and its applications

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