EP0748924A2 - Tank system for drillingmud - Google Patents

Tank system for drillingmud Download PDF

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Publication number
EP0748924A2
EP0748924A2 EP96107343A EP96107343A EP0748924A2 EP 0748924 A2 EP0748924 A2 EP 0748924A2 EP 96107343 A EP96107343 A EP 96107343A EP 96107343 A EP96107343 A EP 96107343A EP 0748924 A2 EP0748924 A2 EP 0748924A2
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EP
European Patent Office
Prior art keywords
tanks
tank system
flushing
flushing tank
containers
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.)
Granted
Application number
EP96107343A
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German (de)
French (fr)
Other versions
EP0748924B1 (en
EP0748924A3 (en
Inventor
Heinrich Plasger
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.)
Bentec Drilling and Oilfield Systems GmbH
Original Assignee
Bentec Drilling and Oilfield Systems GmbH
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 Bentec Drilling and Oilfield Systems GmbH filed Critical Bentec Drilling and Oilfield Systems GmbH
Publication of EP0748924A2 publication Critical patent/EP0748924A2/en
Publication of EP0748924A3 publication Critical patent/EP0748924A3/en
Application granted granted Critical
Publication of EP0748924B1 publication Critical patent/EP0748924B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP 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
    • E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
    • E21B21/065—Separating solids from drilling fluids

Definitions

  • the invention relates to a tank system for the preparation of the drilling fluid from bores as part of a drilling system.
  • Tank systems of conventional land drilling rigs which consist of two or more rectangular tanks in which the mud is prepared and stored for days. Either rectangular tanks or silos are used to store the reserve flush.
  • a disadvantage of such tank systems is the fact that the solids that are contained in the flushing settle in the corners of the rectangular tanks and they therefore have to be cleaned before changing the flushing and before converting the drilling rigs. In addition to the high expenditure of time required for this, the settling of the solids leads to the fact that the flushing is no longer homogeneous to a considerable extent and that the usable tank volume is reduced. Rectangular tanks are used in particular where transportability is necessary for drilling rigs. Furthermore, the connection of rectangular tanks to one another is complicated and time-consuming.
  • the invention is based on the object of developing a flushing tank system in which on the one hand the aforementioned disadvantages, such as settling of the solids, high cleaning effort and reduced homogeneity of the flushing, are prevented and on the other hand simple and easy to transport.
  • round tanks are arranged on container slides, the upper part of which is cylindrical and the lower part of which is conical.
  • the arrangement of the tanks on container slides advantageously ensures that they can be transported just as easily as rectangular tanks according to the prior art.
  • Another advantage of the arrangement of the round tanks is that there is space in the area of the conical part, for example for high-pressure lines, distributors, pumps (centrifugal pumps, charge pumps, etc.) and valves.
  • the tanks can be made of lighter steel of the same material quality.
  • the tanks are advantageously self-cleaning, which means that neither shovels nor hoses and no personnel are required for cleaning work. Tanks designed in this way reduce the costs of flushing, since almost the entire capacity of the flushing tanks can be used. With the advantageous structural design, short assembly and dismantling times are also achieved.
  • the tanks arranged on the container carriage are designed as shaking sieve tanks or as mixing or rinsing mixing tanks.
  • the advantage of this arrangement is that, depending on requirements, tanks that meet special requirements can be used with little effort and efficiently.
  • Agitators are arranged in the tanks. Homogenization of the rinsing liquid is thus advantageously achieved. It also prevents solids from settling.
  • Baffles are arranged in the tanks, which advantageously contribute to better mixing of the rinsing liquid.
  • the tanks are completely closed.
  • a special cover is no longer required for an oil flush.
  • FIG. 1 shows the side view of a flushing tank system
  • FIG. 2 shows the top view of a flushing tank system.
  • FIG. 1 shows a total of several container modules with round tanks 5, 6, the upper part of which is cylindrical and the lower part of which is conical.
  • the round tanks are arranged on container slides 2, 3.
  • the shaker skid 2 comprises four tanks 5 with a diameter of 3.0 m, a height of 3.0 m and 12.5 m 3 capacity per tank.
  • On the slide 3 with the suction / mixing tanks there are a total of five tanks, four of them tanks 6 with the same dimensions as the tanks 5 and a pill tank 4 (1.8 m in diameter, 2.1 m in height, 4 m 3 capacity).
  • the total volume of the flushing tank system is 108 m 3 .
  • a rinsing agitator 1 arranged in the middle is installed in each of the tanks 5, 6, a rinsing agitator 1 arranged in the middle is installed.
  • Baffles (not shown) are arranged in the tanks 4, 5, 6 for better mixing of the rinsing liquid.
  • the baffles are arranged vertically, oriented radially to the tank axis. There are passages between the baffle and the tank wall through which parts of the flushing liquid can flow, so that deposits in the area of the transition between the baffle and the tank wall are avoided.
  • the free space can be used for the high pressure lines and distributions as well as for pump 7 (centrifugal pumps, charge pumps, valves, etc.).
  • Additional containers 12 can be placed on the flushing tank system.
  • these upper containers which are attached to the lower ones, there are solids removal equipment (shale shakers and desilters), degasser equipment, power distribution and the system for the control and mud logging of the flushing (measuring device for flushing control).
  • the upper containers can be reached via a staircase 13.
  • the rinsing tanks are connected to each other with 12 '' lines 8, which are each installed on the floor. However, 10 '' or 8 '' lines can also be installed and connected. All tanks are completely closed at the top, so that, for example, a special cover is not required for an oil flush.
  • the covered washing trough 11 leads past the shaker screen into the individual tanks.
  • a ring line 9 is installed in the frame of the container carriage 2, 3.
  • the flushing tank system consists of four containers that are suitable for road transport, including all high-pressure lines and other accessories.
  • the hatches 10 shown in FIG. 2 serve to inspect the individual tanks 4, 5, 6.

Abstract

A flushing tank system for the treatment of material flushed out of bore holes, consists of one or more round tanks located on a container unit. The upper tank sections are cylindrical while the lower sections are conical. The tanks pref. contain a stirring mechanism and guide plates.

Description

Die Erfindung betrifft ein Tanksystem für die Aufbereitung der Spülung aus Bohrungen als Teil einer Bohranlage.The invention relates to a tank system for the preparation of the drilling fluid from bores as part of a drilling system.

Es sind Tanksysteme herkömmlicher Landbohranlagen bekannt, die aus zwei oder mehreren rechteckigen Tanks bestehen, in welchen die Spülung über Tage aufbereitet und gelagert wird. Für die Lagerung der Reservespülung werden entweder rechteckige Tanks oder Silos verwendet. Nachteil derartiger Tanksysteme ist die Tatsache, daß sich die Feststoffe, die in der Spülung enthalten sind, in den Ecken der rechteckigen Tanks absetzen und diese deshalb jeweils vor Auswechseln der Spülung und vor Umbauten der Bohranlagen gereinigt werden müssen. Neben dem hohen Zeitaufwand, der dafür nötig ist, führt das Absetzen der Feststoffe dazu, daß die Spülung zu einemn erheblichen Prozentsatz nicht mehr homogen ist und daß sich das nutzbare Tankvolumen verringert. Das Einsatzgebiet von rechteckigen Tanks liegt insbesondere dort, wo für Bohranlagen eine Transportierbarkeit notwendig ist. Desweiteren ist der Anschluß von rechteckigen Tanks untereinander aber kompliziert und zeitaufwendig.Tank systems of conventional land drilling rigs are known which consist of two or more rectangular tanks in which the mud is prepared and stored for days. Either rectangular tanks or silos are used to store the reserve flush. A disadvantage of such tank systems is the fact that the solids that are contained in the flushing settle in the corners of the rectangular tanks and they therefore have to be cleaned before changing the flushing and before converting the drilling rigs. In addition to the high expenditure of time required for this, the settling of the solids leads to the fact that the flushing is no longer homogeneous to a considerable extent and that the usable tank volume is reduced. Rectangular tanks are used in particular where transportability is necessary for drilling rigs. Furthermore, the connection of rectangular tanks to one another is complicated and time-consuming.

Der Erfindung liegt die Aufgabe zugrunde, ein Spülungstanksystem zu entwickeln, bei dem einerseits die vorgenannten Nachteile, wie Absetzen der Feststoffe, hoher Reinigungsaufwand und verminderte Homogenität der Spülung, verhindert wird und das andererseits jedoch einfach und leicht zu transportieren ist.The invention is based on the object of developing a flushing tank system in which on the one hand the aforementioned disadvantages, such as settling of the solids, high cleaning effort and reduced homogeneity of the flushing, are prevented and on the other hand simple and easy to transport.

Die Aufgabe wird dadurch gelöst, daß auf Containerschlitten runde Tanks angeordnet sind, deren oberen Teil zylindrisch und deren unterer Teil konisch ausgebildet ist. Durch die Anordnung der Tanks auf Containerschlitten wird vorteilhafterweise erreicht, daß man sie ebenso leicht transportieren kann wie rechteckige Tanks nach dem Stand der Technik. Vorteilhaft bei der Anordnung der runden Tanks ist weiterhin, daß im Bereich des konischen Teils Platz zum Beispiel für Hochdruckleitungen, Verteiler, Pumpen (Zentrifugalpumpen, Ladepumpen, etc.), und Ventile vorhanden ist.The object is achieved in that round tanks are arranged on container slides, the upper part of which is cylindrical and the lower part of which is conical. The arrangement of the tanks on container slides advantageously ensures that they can be transported just as easily as rectangular tanks according to the prior art. Another advantage of the arrangement of the round tanks is that there is space in the area of the conical part, for example for high-pressure lines, distributors, pumps (centrifugal pumps, charge pumps, etc.) and valves.

Darüber hinaus ist ein weiterer Vorteil, daß die Tanks aus leichterem Stahl von gleicher Materialgüte hergestellt werden können. Die Tanks sind in vorteilhafter Weise selbstreinigend, das heißt, daß weder Schaufeln noch Schläuche sowie kein Personal für Reinigungsarbeiten benötigt wird. Durch derartig ausgebildete Tanks werden die Kosten der Spülung reduziert, da nahezu das gesamte Fassungsvermögen der Spülungstanks genutzt werden kann. Mit der vorteilhaften konstruktiven Gestaltung werden außerdem kurze Aufbau- und Abbauzeiten erreicht.In addition, another advantage is that the tanks can be made of lighter steel of the same material quality. The tanks are advantageously self-cleaning, which means that neither shovels nor hoses and no personnel are required for cleaning work. Tanks designed in this way reduce the costs of flushing, since almost the entire capacity of the flushing tanks can be used. With the advantageous structural design, short assembly and dismantling times are also achieved.

Die auf dem Containerschlitten angeordneten Tanks sind als Schüttelsiebtank oder als Misch- bzw. Spülungsanmischtank ausgebildet. Vorteil dieser Anordnung ist, das, je nach Bedarf, spezielle Anforderungen erfüllende Tanks mit geringem Aufwand und effizient eingesetzt werden können.The tanks arranged on the container carriage are designed as shaking sieve tanks or as mixing or rinsing mixing tanks. The advantage of this arrangement is that, depending on requirements, tanks that meet special requirements can be used with little effort and efficiently.

In den Tanks sind Rührwerke angeordnet. Damit wird vorteilhaft eine Homogenisierung der Spülungsflüssigkeit erreicht. Desweiteren wird ein Absetzen von Feststoffen verhindert.Agitators are arranged in the tanks. Homogenization of the rinsing liquid is thus advantageously achieved. It also prevents solids from settling.

In den Tanks sind Leitbleche angeordnet, die vorteilhaft zur besseren Durchmischung der Spülungsflüssigkeit beitragen.Baffles are arranged in the tanks, which advantageously contribute to better mixing of the rinsing liquid.

Die Tanks sind vollständig geschlossen ausgebildet. Vorteilhafterweise wird hiermit z.B. bei einer Ölspülung eine besondere Abdeckung nicht mehr erforderlich.The tanks are completely closed. Advantageously, e.g. a special cover is no longer required for an oil flush.

Mehrere Container werden zu einer Systemeinheit kombiniert, insbesondere gestapelt, angeordnet und deren Leitungen sind direkt miteinander koppelbar ausgebildet. Vorteilhaft wird somit erreicht, das Containerschlitten mit unterschiedlichen Tanks wie Schüttelsiebtanks und Mischtanks platzsparend nebeneinander bzw. übereinander angeordnet werden können, ohne aufwendige Schlauchverbindungen zwischen den Containern installieren zu müssen. An das Spülungstanksystem können dadurch auch weitere spezielle Container angeordnet werden. In derartigen Containern können sich Einrichtungen wie zum Bespiel Feststoffentfernungsequipment, Degasser-Ausrüstung, Motoren der Rührwerke, Strom- und Kontrollaggregate sowie Meßeinrichtungen zur Spülungskontrolle befinden.Several containers are combined to form a system unit, in particular stacked, arranged, and their lines are designed so that they can be coupled directly to one another. It is thus advantageously achieved that the container carriage with different tanks such as shaking sieve tanks and mixing tanks can be arranged side by side or one above the other in a space-saving manner without having to install complex hose connections between the containers. As a result, other special containers can also be arranged on the flushing tank system. In such containers, facilities such as solids removal equipment, Degasser equipment, motors of the agitators, power and control units as well as measuring devices for rinsing control are located.

Ein Ausführungsbeispiel ist in den Figuren 1 und 2 dargestellt. Die Fig. 1 zeigt die Seitenansicht eines Spülungstanksystems, die Fig. 2 zeigt die Draufsicht eines Spülungstanksystems.An embodiment is shown in Figures 1 and 2. FIG. 1 shows the side view of a flushing tank system, FIG. 2 shows the top view of a flushing tank system.

Die Figur 1 zeigt insgesamt mehrere Containermodule mit runden Tanks 5, 6, deren oberer Teil zylindrisch und deren unterer Teil konisch ausgebildet ist. Die runden Tanks sind auf Container-Schlitten 2, 3 angeordnet. Der Schüttelsiebschlitten (Shaker Skid) 2 umfaßt vier Tanks 5 mit einem Durchmesser von 3,0 m, einer Höhe von 3,0 m sowie 12,5 m3 Fassungsvermögen pro Tank. Auf dem Schlitten 3 mit den Saug-/Mischtanks befinden sich insgesamt fünf Tanks, davon vier Tanks 6 mit den gleichen Abmessungen wie die Tanks 5 sowie ein Spülungsanmischtank (Pill Tank) 4 (1,8 m Durchmesser, 2,1 m Höhe, 4 m3 Fassungsvermögen). Das Gesamtvolumen des Spülungstanksystems beträgt 108 m3. In jedem der Tanks 5, 6 ist ein in der Mitte angeordnetes Spülungsrührwerk 1 installiert. In den Tanks 4, 5, 6 sind Leitbleche (nicht dargestellt) zur besseren Durchmischung der Spülungsflüssigkeit angeordnet. Die Leitbleche sind senkrecht, zur Tankachse radial orientiert, angeordnet. Zwischen Leitblech und Tankwandung befinden sich Durchlässe, durch die Teile der Spülungsflüssigkeit strömen kann, sodaß Ablagerungen im Bereich des Übergangs zwischen Leitblech und Tankwandung vermieden werden.FIG. 1 shows a total of several container modules with round tanks 5, 6, the upper part of which is cylindrical and the lower part of which is conical. The round tanks are arranged on container slides 2, 3. The shaker skid 2 comprises four tanks 5 with a diameter of 3.0 m, a height of 3.0 m and 12.5 m 3 capacity per tank. On the slide 3 with the suction / mixing tanks there are a total of five tanks, four of them tanks 6 with the same dimensions as the tanks 5 and a pill tank 4 (1.8 m in diameter, 2.1 m in height, 4 m 3 capacity). The total volume of the flushing tank system is 108 m 3 . In each of the tanks 5, 6, a rinsing agitator 1 arranged in the middle is installed. Baffles (not shown) are arranged in the tanks 4, 5, 6 for better mixing of the rinsing liquid. The baffles are arranged vertically, oriented radially to the tank axis. There are passages between the baffle and the tank wall through which parts of the flushing liquid can flow, so that deposits in the area of the transition between the baffle and the tank wall are avoided.

Unter dem konischen Teil der Tanks 4, 5, 6 kann der freie Raum für die Hochdruckleitungen und Verteilungen sowie für Pumpe 7 (Zentrifugalpumpen, Ladepumpen, Ventile, etc.) genutzt werden.Under the conical part of the tanks 4, 5, 6, the free space can be used for the high pressure lines and distributions as well as for pump 7 (centrifugal pumps, charge pumps, valves, etc.).

Auf das Spülungstanksystem können weitere Container 12 gestellt werden. In diesen oberen Containern, die an den unteren befestigt werden, befinden sich Solids Removal Equipment (Shale Shaker und Desilter), Degasser-Ausrüstung, Stromverteilung sowie das System für die Kontrolle und Mud Logging der Spülung (Messeinrichtung zur Spülungskontrolle). Die oberen Container können über eine Treppe 13 erreicht werden.Additional containers 12 can be placed on the flushing tank system. In these upper containers, which are attached to the lower ones, there are solids removal equipment (shale shakers and desilters), degasser equipment, power distribution and the system for the control and mud logging of the flushing (measuring device for flushing control). The upper containers can be reached via a staircase 13.

Die Spülungstanks sind untereinander mit 12'' Leitungen 8 verbunden, die jeweils am Boden installiert sind. Es können aber auch 10'' oder 8'' Leitungen eingebaut und verbunden werden. Alle Tanks sind oben vollständig geschlossen, so daß zum Beispiel bei einer Ölspülung eine besondere Abdeckung nicht erforderlich ist. Die abgedeckte Spülrinne 11 führt am Schüttelsieb vorbei in die einzelnen Tanks. In den Rahmen des Container-Schlitten 2, 3 wird eine Ringleitung 9 installiert. Das Spülungstanksystem besteht aus vier Containern, die zum Straßentransport geeignet sind, einschließlich aller Hochdruckleitungen und sonstigem Zubehör. Die in Figur 2 dargestellten Luken 10 dienen der Inspektion der einzelnen Tanks 4, 5, 6.The rinsing tanks are connected to each other with 12 '' lines 8, which are each installed on the floor. However, 10 '' or 8 '' lines can also be installed and connected. All tanks are completely closed at the top, so that, for example, a special cover is not required for an oil flush. The covered washing trough 11 leads past the shaker screen into the individual tanks. A ring line 9 is installed in the frame of the container carriage 2, 3. The flushing tank system consists of four containers that are suitable for road transport, including all high-pressure lines and other accessories. The hatches 10 shown in FIG. 2 serve to inspect the individual tanks 4, 5, 6.

Claims (6)

Spülungstanksystem für die Aufbereitung der Spülung aus Bohrungen, dadurch gekennzeichnet, daß auf einem Containerschlitten ein oder mehrere runde Tanks angeordnet sind, deren oberen Teil zylindrisch und deren unterer Teil konisch ausgebildet ist.Flushing tank system for the preparation of the flushing from bores, characterized in that one or more round tanks are arranged on a container carriage, the upper part of which is cylindrical and the lower part of which is conical. Spülungstanksystem nach Anspruch 1, dadurch gekennzeichnet, daß die auf dem Containerschlitten angeordneten Tanks als Schüttelsiebtank oder als Misch- bzw. Spülungsanmischtank ausgebildet sind.Flushing tank system according to claim 1, characterized in that the tanks arranged on the container carriage are designed as shaking sieve tanks or as mixing or flushing mixing tanks. Spülungstanksystem nach Anspruch 1 und 2, dadurch gekennzeichnet, daß in den Tanks Rührwerke angeordnet sind.Flushing tank system according to claim 1 and 2, characterized in that agitators are arranged in the tanks. Spülungstanksystem nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß in den Tanks Leitbleche angeordnet sind.Flushing tank system according to one of claims 1 to 3, characterized in that baffles are arranged in the tanks. Spülungstanksystem nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Tanks vollständig geschlossen ausgebildet sind.Flushing tank system according to one of claims 1 to 4, characterized in that the tanks are completely closed. Spülungstanksystem nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß mehrere Container zu einer Systemeinheit kombiniert, insbesondere gestapelt, angeordnet und deren Leitungen direkt miteinander koppelbar ausgebildet sind.Flushing tank system according to one of claims 1 to 5, characterized in that a plurality of containers are combined to form a system unit, in particular stacked, arranged and the lines of which can be coupled directly to one another.
EP96107343A 1995-06-17 1996-05-09 Tank system for drillingmud Expired - Lifetime EP0748924B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29509875U 1995-06-17
DE29509875U DE29509875U1 (en) 1995-06-17 1995-06-17 Flush tank system

Publications (3)

Publication Number Publication Date
EP0748924A2 true EP0748924A2 (en) 1996-12-18
EP0748924A3 EP0748924A3 (en) 1997-12-17
EP0748924B1 EP0748924B1 (en) 2002-06-12

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EP96107343A Expired - Lifetime EP0748924B1 (en) 1995-06-17 1996-05-09 Tank system for drillingmud

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EP (1) EP0748924B1 (en)
AT (1) ATE219208T1 (en)
DE (2) DE29509875U1 (en)
NO (1) NO962420L (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1484472A1 (en) * 2003-06-05 2004-12-08 National-Oilwell, L.P. Modular mud plant

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2693981C1 (en) * 2018-04-16 2019-07-08 Акционерное Общество "Урало-Сибирская Промышленная Компания" Two environmental-friendly drilling rig in arctic design

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3238647A1 (en) * 1982-10-19 1984-05-03 Klaus 6107 Reinheim Obermann Mixer
US4457627A (en) * 1982-04-05 1984-07-03 Kirby Robert E Circular containment system for well drilling fluid
DE3316051A1 (en) * 1983-05-03 1984-11-08 Erno Raumfahrttechnik Gmbh, 2800 Bremen Transportable drilling system
US4552463A (en) * 1984-03-15 1985-11-12 Harry Hodson Method and apparatus for producing a colloidal mixture
FR2617899A1 (en) * 1987-07-09 1989-01-13 Intrafor Process and installation for the treatment of excavated material
US5333752A (en) * 1993-02-18 1994-08-02 Clawson Tank Company Storage container unit for hazardous liquids

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4457627A (en) * 1982-04-05 1984-07-03 Kirby Robert E Circular containment system for well drilling fluid
DE3238647A1 (en) * 1982-10-19 1984-05-03 Klaus 6107 Reinheim Obermann Mixer
DE3316051A1 (en) * 1983-05-03 1984-11-08 Erno Raumfahrttechnik Gmbh, 2800 Bremen Transportable drilling system
US4552463A (en) * 1984-03-15 1985-11-12 Harry Hodson Method and apparatus for producing a colloidal mixture
FR2617899A1 (en) * 1987-07-09 1989-01-13 Intrafor Process and installation for the treatment of excavated material
US5333752A (en) * 1993-02-18 1994-08-02 Clawson Tank Company Storage container unit for hazardous liquids

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1484472A1 (en) * 2003-06-05 2004-12-08 National-Oilwell, L.P. Modular mud plant
US7296640B2 (en) 2003-06-05 2007-11-20 National-Oilwell, L.P. Solids control system

Also Published As

Publication number Publication date
DE59609317D1 (en) 2002-07-18
NO962420D0 (en) 1996-06-07
DE29509875U1 (en) 1995-08-24
NO962420L (en) 1996-12-18
ATE219208T1 (en) 2002-06-15
EP0748924B1 (en) 2002-06-12
EP0748924A3 (en) 1997-12-17

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