WO2007118155A2 - Drill cuttings transfer system and related methods - Google Patents
Drill cuttings transfer system and related methods Download PDFInfo
- Publication number
- WO2007118155A2 WO2007118155A2 PCT/US2007/066077 US2007066077W WO2007118155A2 WO 2007118155 A2 WO2007118155 A2 WO 2007118155A2 US 2007066077 W US2007066077 W US 2007066077W WO 2007118155 A2 WO2007118155 A2 WO 2007118155A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cuttings
- tank
- flow
- conveyance member
- lower portion
- Prior art date
Links
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
-
- 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
- E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
Definitions
- This disclosure relates generally to handling of waste materials, especially particulate drill solids.
- drilling fluids or "muds” are used to provide well bore lubrication, to cool the drill bit, to protect against corrosion and to provide a pressure head to maintain formation integrity.
- drilling muds There are two main types of drilling muds: water-based and oil-based.
- surface pu ⁇ p5 ⁇ circ ⁇ la1e drilling mud down the Tubular drill string.
- the mud exits at the drill bit and flows up the annulus between the drill string and the bore.
- the returning fluid (or return fluid) carries the drill cuttings away from the bit and out of the wellbore.
- Oil-based drilling muds are stable oil external-water internal emulsions including wetting agents to hold solids such as drill cuttings in the oil phase. The drill cuttings thus tend to become oil wet, trapping large quantities of oil-based mud in their intergranular spaces and creating environmental concerns regarding disposal of the oil-contaminated drill cuttings.
- the cuttings are commonly separated from the drilling fluid by devices such as shale shakers, which remove cuttings and large solids from the drilling fluid during the circulation thereof.
- a device has a sloping, close mesh screen over which fluid returning from the hole being drilled passes.
- the solids captured on the screen travel down the sloping surface to be collected in the shaker ditch or cuttings trough. It is also desirable to recover as much of the expensive drilling fluids as possible. Therefore, other devices, which play a role in the separation of solids from drilling fluids, include cyclone separators and centrifuges.
- the cuttings discharged from the shakers, cyclones and centrifuges that are collected in the shaker ditch or cuttings trough are still highly contaminated with the drilling fluids afid therefore form a slurry or heavy sludge.
- the slurry is conveyed into containers or skips, which are then periodically moved by crane from the rig onto a vessel.
- pressurized air can be fed into one or more locations in the bulk tank.
- One function for this pressurized air is to balance the pressure between the bulk tank and devices connected to the bulk tank.
- the cuttings conveyance member feeds cuttings into a transfer line in communication with a pneumatic flow device.
- the pneumatic flow device uses high pressure air to propel cuttings along the transfer line.
- pressurized air is fed into the bulk tank at a pressure value that compensates for increased pressures generated by the pneumatic flow device.
- the inflowing gas penetrates this relatively dense cuttings layer and reduces its density and/or physically displaces this layer.
- a first pressurized gas line at a top of the tank pressure balances the tank and a second pressurized gas line fluidizes the relatively dense cuttings layer.
- the pressurized gas line for fluidizing the relatively dense cuttings layer provides gas at a pressure value that also pressure balances the bulk tank.
- Fig. 2b schematically illustrates an end view of a bulk tank in accordance with one embodiment of the present disclosure
- Fig. 3 schematically illustrates an wedge shaped lower section of a bulk tank made in accordance with one embodiment of the present disclosure
- Fig. 4 schematically illustrates a bulk tank and pressurized air supply system in accordance with one embodiment of the present disclosure
- Fig. 5 schematically illustrates a bulk tank in accordance with one embodiment of the present disclosure used in an offshore drilling environment.
- the present disclosure relates to devices and methods for processing, storing and transporting a slurry of drill cuttings.
- the present disclosure is susceptible to embodiments of different forms. There are shown in the drawings, and herein will be described in detail, specific embodiments of the present disclosure with the understanding that the presenLdisclosu ⁇ e is to be considered an exemplification of the principles of the disclosure, and is not intended to limit the disclosure to that illustrated and described herein. Further, none of the described elements or combination of elements should be considered essential features of the present teachings unless the description expressly describes the element or combination of elements as essential.
- a cuttings handling system 10 may include a separation unit 12, cuttings flow units 14,15, and one or more bulk tanks 16.
- the system offloads the cuttings to one or more suitable containers 18 on a transport vessel (not shown).
- the system receives return fluid, which has entrained cuttings, from a wellbore being drilled.
- the separations unit 12 separates some of the drilling fluid from the return fluid for re-use in further drilling and also forms a slurry of cuttings.
- the cuttings flow unit 14 conveys the cuttings via a conduit 20 to the bank of bulk tanks 16.
- the separations unit 12 extracts the relatively expensive drilling fluid from the return fluid.
- the separations unit 12 can include one or more shale shakers 21. Within the shale shaker 21, the return fluid and entrained solids are discharged over a vibratory separator that has one or a series of tiered screens. The screens catch and remove solids from the return fluid flowing therethrough,
- the separations unit 12 can also include other separation devices, such-as a centrifugal separator 22, that are also configured to extract drilling fluid from the cuttings. Such separation devices and techniques are known in the art and will not be discussed in further detail.
- the effluent or output of the separations unit 12 is a relatively viscous slurry made up of oil or additive-covered rock, earth and debris. The terms cuttings and slurry will be used interchangeably.
- the cuttings flow unit 14 transports the cuttings from the separations unit 12 to other devices such as the bulk tanks 16 or another location such as the vessel storage tanks 18.
- the cuttings flow unit 14 includes an auger-type device that continually conveys the cuttings to a dense phase blower 24 that impels the cuttings through a conduit 20 such as piping or hoses.
- Suitable valves such as a diverter valve can be used in the conduit 20 to selectively direct flow of the cuttings.
- the bulk tanks 16 receive and store the flow of cuttings from the conduit 20.
- the tanks 16 have an upper cylindrical portion 26 and a lower portion 28 that converges to an elongated opening 29.
- the lower portion 28 promotes mass flow of cuttings through the tank 16.
- a conveyance member 32 Positioned at a bottom end of the lower portion 28 is a conveyance member 32 that applies a motive force that impels the cuttings out of the bulk tanks 16.
- Pressurized gas, such as air, from a source 34 is fed into one or more locations in the bulk tank 16 to maintain a pressure balance in the system 10 and/or to fluidize the cuttings in the bulk tank 16.
- the filling of the bulk tanks 16 can be controlled manually, automatically or a combination thereof.
- a controller 35 receives signals from sensors 36 positioned on the bulk tanks 16. The sensor signals indicate the amount of cuttings in the bulk tanks 16.
- a controller 35 can have a programmable logic circuit (PLC) that directs flow into a bulk tank 16 until the associated sensor 36 indicates that the bulk tank 16 is- full. Thereafter, -the PLC stops flow to the bulk tank 16 by actuating appropriate valves and initiates flow into the next bulk tank 16. This process can continue until all of the bulk tanks 16 are filled. While a sequential filling process has been described, it should be appreciated that two or more bulk tanks 16 can be filled at the same time. While in some embodiments, the tank can be constructed to hold 100 BBL of drill cuttings having a specific gravity of 2.34, other sizes and configurations can also be used.
- the conveyance member 32 forcibly impels the cuttings out of the bulk tanks 16.
- the conveyance member 32 is a rotating screw conveyor driven by a motor drive 33.
- a screw flight portion extends horizontally along a long axis of the wedge shaped portion 28. Rotation of the screw propels the cuttings to the transfer line 22 and the cuttings flow unit 15.
- the conveyance member 32 is right and left hand reversible. In the right hand rotation mode, the cuttings flow downward to a port 36. In the left hand rotation mode, the cuttings are mixed to maintain material consistency.
- two or more conveyance members can cooperate to expel the cuttings out of the bulk tank 16.
- a screw or auger is merely one illustrative member suitable for applying a motive force throughout the body of the cuttings.
- the conveyance member 32 positioned within the bulk tank is susceptible to numerous variations that can adequately apply a motive force to expel the cuttings out of the bulk tank 16.
- suitable conveyance mechanisms include pneumatic systems, progressivencavity pumps, and " vacuum pumping systems.
- the lower portion 28 cooperates with the conveyance member 32 to discharge flow out of the tank 16.
- the lower portion 28 has a wedge, chisel or trough shape that is generally defined by two sets of walls 40 and 42. For convenience, such a shape will be referred to as a wedge shape.
- Each set of walls 40 and 42 has an associated angle 46 and 48 from horizontal, respectively. The angles 46 and 48 are selected such that the first drill cuttings that enter into the tank are the first drill cuttings to exit the tank, i.e., mass flow.
- the walls 40 and 42 converge to the opening 29 that is longitudinally aligned with the conveyance member 32.
- the opening 29 presents a relatively large elongated slot-like cross-sectional flow area through which the cuttings can flow.
- the wedge shaped portion 28 and elongated opening 29 can evenly distribute cuttings across a relatively large portion of the conveyance member 32.
- Other elongated or non-conical shapes can also be used in certain applications.
- the system 10 discharges cuttings out of the tank 16 using a mechanically driven and gravity assisted arrangement.
- the inflowing gas can also physically displace or dislodge portions of this layer from the interior surfaces of the tank 16.
- One or more ports 62b can also be positioned at or near a top of the tank 16 to provide pressure balancing gas.
- the source 60 operates as the cuttings flow unit 15 (Fig. 1) by supplying high pressure gas to propel cuttings through the transfer line 22.
- the source 60 can supply a continuous flow of high pressure air into the transfer line 22 at the same time the conveyance member 32 (Fig. 2A) feeds cuttings into the transfer line 22. Because the source 60 and the bulk tanks 16 are in fluid communication via the transfer line 22, the high pressure gas in the transfer line 22 can apply a back pressure at the tank 16.
- This applied back pressure can restrict the flow of cuttings out of the tank 16.
- pressurized gas fed through the ports 62b increases the pressure in the tank 16 to at least partially offset this applied back pressure.
- the pressurized gas flowing through ports 62a can both fluidize the relatively dense cuttings layer and provide gas at a pressure value that also pressure balances the bulk tank.
- valves 70 for selectively feeding gas into the ports 62a and 62b can be controlled by solenoid controls 72.
- a solenoid 64 control unit can also be used to control a valve 74 feeding pressurized air into the transfer line 22.
- suitable gauges 76 such as pressure gauges and level gages can be positioned as desired on the tank 16.
- the pressurized gas can be air but other cjases sijcji asniicogsji can be used
- the cuttings handling systems described above offer enhanced safety due to the reduced number of handling operations such as interventions by personnel to hook up containers to the crane, manual shoveling of cuttings into containers, transfers of containers around the rig floor, use of the crane rig, etc.
- the transport vessel to which the cuttings is offloaded is only temporarily moored adjacent the rig. A continuously moored transport vessel could pose a hazard to the rig and itself during rough seas. Thus, reducing the time the transport vessel is moored to the rig also reduces the risk that inclement weather will interfere with drilling operations.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2007234766A AU2007234766A1 (en) | 2006-04-05 | 2007-04-05 | Drill cuttings transfer system and related methods |
BRPI0709999-1A BRPI0709999A2 (en) | 2006-04-05 | 2007-04-05 | drilling rock fragment transfer system and related methods |
GB0817876A GB2450047A (en) | 2006-04-05 | 2007-04-05 | Drill cuttings transfer system and related methods |
NO20084057A NO20084057L (en) | 2006-04-05 | 2008-09-24 | Transmission system for cuttings and related methods |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US78939506P | 2006-04-05 | 2006-04-05 | |
US60/789,395 | 2006-04-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2007118155A2 true WO2007118155A2 (en) | 2007-10-18 |
WO2007118155A3 WO2007118155A3 (en) | 2008-04-10 |
Family
ID=38581826
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2007/066077 WO2007118155A2 (en) | 2006-04-05 | 2007-04-05 | Drill cuttings transfer system and related methods |
Country Status (6)
Country | Link |
---|---|
US (1) | US20080128173A1 (en) |
AU (1) | AU2007234766A1 (en) |
BR (1) | BRPI0709999A2 (en) |
GB (1) | GB2450047A (en) |
NO (1) | NO20084057L (en) |
WO (1) | WO2007118155A2 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110052353A1 (en) * | 2009-08-27 | 2011-03-03 | Charles Franklin Spenser | Apparatus and method for collecting and transporting oil well drill cuttings |
DK2480748T3 (en) * | 2009-09-25 | 2013-12-16 | Schlumberger Norge As | SERVICE SHIP FOR PERFORMING MULTIPLE PROCESSES |
US11125031B2 (en) * | 2019-07-19 | 2021-09-21 | Milestone Environmental Services, Llc | Receiving pit and trench for a drilling fluid disposal system |
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2007
- 2007-04-05 GB GB0817876A patent/GB2450047A/en not_active Withdrawn
- 2007-04-05 WO PCT/US2007/066077 patent/WO2007118155A2/en active Application Filing
- 2007-04-05 US US11/697,084 patent/US20080128173A1/en not_active Abandoned
- 2007-04-05 BR BRPI0709999-1A patent/BRPI0709999A2/en not_active IP Right Cessation
- 2007-04-05 AU AU2007234766A patent/AU2007234766A1/en not_active Abandoned
-
2008
- 2008-09-24 NO NO20084057A patent/NO20084057L/en not_active Application Discontinuation
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Also Published As
Publication number | Publication date |
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GB2450047A (en) | 2008-12-10 |
GB0817876D0 (en) | 2008-11-05 |
US20080128173A1 (en) | 2008-06-05 |
AU2007234766A1 (en) | 2007-10-18 |
WO2007118155A3 (en) | 2008-04-10 |
NO20084057L (en) | 2008-10-27 |
BRPI0709999A2 (en) | 2011-08-02 |
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