GN designed centrifuge mud tank for oilfield and dredging project, with 1 unit of GNLW553VFD decanter centrifuge(or other model available) and Nemo pump to feed the centrifuge, the centrifuge tank is divided into 2 compartment, the mud after treated by shale shaker, desander/desilter flow or be pumped to compartment 1, then Nemo pumppumped it from the compartment 1 to the centrifuge for processing, the clean drilling mud dropped into compartment 2, which can be pumped to other application or flow to anywhere required.

centrifuge mud tank

In oilfield application, sometimes mud hopper unit also installed on centrifuge mud tank, the mud which will be feed to centrifuge is with solids smaller than 20 microns, it has been separated by desilter cone. After treated by decanter centrifuge, the max solids remained in the drilling fluids is smaller than 5 microns, it is called “clean mud”. The clean mud may be weighted in pill tank/compartment and mixed by mud mixing hopper & mixing pump.

In Dredging project, centrifuge mud tank is applied after dredging slurry separation system, after treated by the desander ( or sometimes desilter), the solids remained in the slurry may be too fine to be separated out by the centrifuge, so you need a flocculation tank before centrifuge mud tank. After flocculation, the mud is concentrate so It is easy for centrifuge to separate it, this is for better performance. So you have to use a positive displacement pump to pump the flocculated mud to centrifuge, otherwise the centrifugal pump will break it off. Sometimes filter press will replace the centrifuge, but efficiency of filter press is not so dissatisfied, so people use large treating capacity centrifuge instead.

Continue reading →

Screw conveyors, sometimes called augers or auger conveyor, are used as an efficient way to move a wide variety of materials. The auger is used to move material along a path using a helical screw. The process of drilling with a helical bit involves aspects of both: the creation of the hole with the tip of the bit is drilling, while moving the waste material out of the hole along the helical path is augering. Not all drilling involves augering (oil field drilling uses a pump to move the material). Screw conveyors in oilfield are often used horizontally or at a slight incline as an efficient way to move drilling fluids with drill cuttings.

Auger screw for oilfiled

Main components of Auger screw:

Motor, control panel, Screw( including blade and shaft),Conveyor housing, Supporting feet and saddles, Feed and discharge spouts, Cover, Through end, etc.

Screw consists of a several of blades of helix shape welded to a pipe or shaft. It moves the material. The following specs should be calculated carefully for proper use: Flight outside diameter, type of blades, spacing between the blades, thickness of the external diameter and interior shaft and rotation direction.

Continue reading →

Simply speaking, mud cleaner is desander, desilter, shale shaker 3 in 1, sometimes people called it 3 in 1. For a four phase cleaning solids control system, mud cleaner can do the job for 2^nd and 3^rdphase cleaning of drilling fluids.

mud cleaner

GN mud cleaner features:

1 standard design with various treating capacity, 500gpm, 1000gpm, 1500gpm

2 large shaker screen area to dry the solids and recycle more fluids

3 compact footprint, container shipping suitable

4 Easy maintenance, stainless steel valve on each hydrocyclone can make the replacement of cone easier, you do not need to stop whole machine.

MI-SWACO mud cleaner features:

Designed to handle the entire circulating volume to remove and dry solids while retaining premium base fluid. They are equally effective for both weighted and unweighted drilling-fluids.The hydrocyclones make the primary separation with underflow directed onto the shaker vibrating screen.

GN mud cleaner VS MI-SWACO mud cleaner

Continue reading →

What is Barite used for？

Barite is commonly used to add weight to drilling fluid. Barite is of significance to petrophysicists because excess barite can require a correction factor in some well log measurements.

barite recycling centrifuge

Barite Recycling centrifuge

GNLW452S centrifuge is an ideal choice for barite recycling centrifuge, it has been used in oilfield in Russia and middle east for barite recycling. Its max rotary speed is 2200rpm and max separation factor is 1220.

Barite recycling centrifuge is also called low speed centrifuge. Its separating factor is 500~700. To low-density solids, its separating point is 5~10μm. To high-density solids, its separating point is 4~7μm.

Barite recycling unit

High speed centrifuge’s separating factor is 1200~2100 or so, separating point is 2~5μm, it is usually connected with low speed centrifuge to make up a dual centrifuge system. In the system, barite recycling centrifuge is installed in the first phase, barite separated from it is discharged into mud tank to be recovered, liquid is drained into a surge drum first, and then be sent by a pump to high speed centrifuge; the solid separated from high speed centrifuge will be discharged out of the tank and the liquid is back to recirculation system. GNLW363VFD centrifuge can be also used for barite recycling, you can control the speed to 1500~1800rpm by variable frequency drive control panel, when you need to separate more fine solids, you can adjust the speed to 3200~3500rpm.

Continue reading →

Bottom type mud guns are the drilling mud gun installed close to the bottom of the tank which are meant to provide supplemental or primary mixing in mud tanks depending on the number being used and the pit size. They are best used in tank corners to keep solids from settling and a mud agitator is placed in the tank center.Bottom Type Mud Guns are designed for submerged service in steel pits.

Bottom Type Mud Gun

Specification of GN Bottom Type Mud Guns

GN Solids Control is one of the top  mud gun manufacturers in China,and with sales and services around the world.

Bottom Type Mud guns are to be located in the tank corners. The centerline of the nozzle is to be located about 6” off the tank bottom.

The mining sector in Chile is one of the pillars of Chilean economy and copper exports alone stands for more than one third of government income. Mining Minerals exploration by diamond core drilling will need decanter centrifuge. Usually the decanter centrifuge for mining is different with oil & gas drilling. The latter one will be with small handling rate and high G force, it needs to separate fine microns. The decanter centrifuge used for oil drilling fluids usually with larger treating capacity( 40~60m3/h, like MI-Swaco 414, 518 series or GNLW363 &GNLW364G decanter centrifuge).

Features of decanter centrifuge for mining diamond core drilling:

centrifuge for mining diamond drilling

1 Small handling rate:

GNLW220X660 centrifuge with treating capacity 150L/MIN, centrifuge bowl 9”, bowl length 26”.

2 Small foot print

Diamond core drilling mud system should be portable system with small foot print and easy to move from one site to another, so the centrifuge applied should be also small foot print. GNLW220X660 centrifuge dimension is 865×1080×755mm and weighted 750kgs. It is an ideal model for mining drilling mud system.

3 High rotary speed, high G-force( separation sector)

GNLW220X660 centrifuge with rotary speed max to 4000rpm, the operation speed is 3500rpm. The separation factor in 3500rpm can reach 1500G, it can separate fine particles to meet diamond drilling requirement.

Other advantages of GNLW220X660 centrifuge:

4 large extruder L/D=3, high speed, small speed differential gear, large torque

Continue reading →

The big bowl big volume decanter centrifuge with high speed is now becoming more and more popular.The popular models of the the big bowl and big volume decanter centrifuge as below:

• GNLW553  with 550mm diamter bowl and 1800mm bowl length.
• Derrick DE-7200 VFD with 544mm big bowl and 1829 bowl length.
• NOV Brandt HS-2172 with 533mm big bowl and 1829 bowl length.
• MI Swaco CD-600 with 598mm big bowl and 1930mm bowl length

Big Decanter Centrifuge

More about GNLW553 big bowl big volume centrifuge specifications.

Derrick DE-7200 VFD  Big Bowl Big Volume Decanter Centrifuge Specifications

The DE-7200 Variable Frequency Drive (VFD) centrifuge offers the high flexibility in system control, permitting it to handle a wide range of feed slurries. Its automatic startup and shutdown routines permit safe, consistent, unattended operation. Automatic load sensing and feed pump control facilitate automated performance optimization. The bowl can be operated at up to 3000 RPM, resulting in centrifugal acceleration of 2750 G’s. To accommodate low levels of agitation and rapid solids removal, the conveyor can operate at differential speeds ranging from 1 to 70 RPM. The DE-7200 drive system consists of two explosion-proof inverter-duty motors. A 150 HP motor drives the bowl, and a 60 HP motor operates the conveyor.

Motors are powered by Pulse Width Modulated (PWM) AC drives having Insulated Gate Bipolar Transistor (IGBT) outputs. Each motor drive and peripherals are controlled by an environmentally hardened PLC, which offers operating flexibility, short-term data storage and display of critical parameters, and remote monitoring and control of the centrifuge from up to thousands of miles away.

Some more info. about Brandt HS-2172 Centrifuge

http://www.nov.com/Brands/Brandt/Centrifuges/HS-2172_Centrifuge.aspx

Some more info about MI Swaco Big Bowl Big Volume Centrifuge.

GN is one of the few company who can design and manufacture the 500 GPM drilling waste liquid and waste cutting treatment system.Because very few companies manufacture the vertical cutting dryer and big bowl big volume decanter centrifuges.

Part I, Drilling Waste Liquid Treatment

The liquid transport trailer with the waste liquids would unload directly over a 3 panel scalping shaker(GNZS853) mounted on top of a 250 bbl tank (#1) with at least 2 mix agitators in the tank and possibly some gun lines to circulate liquid in corners of tank.

Out of tank #1 need a centrifugal pump(50HP) to feed a desander cleaner (GNZJ852-1S)cone at 500 gal/min with 2 panel shaker mounted on top of 150 bbl tank(#2). 2 agitators in tank #2 and possibly some gun lines to circulate liquid in corners of tank.

Out of tank #2 need a centrifugal pump(50HP) to feed desilter cleaner(GNZJ852-8N) cones at 500 gal/min with 2 panel shaker mounted on top of 150 bbl tank(#3). 2 agitators in tank #3.Out of tank #3 need a centrifuge feed pump to feed a VFD controlled centrifuge(GNLW553VFD) mounted on top of 150 bbl tank(#4). 1 agitator in tank #4.Out of tank #4 need a centrifuge feed pump to feed a VFD controlled centrifuge mounted on top of 150 bbl tank(#5). 1 agitator in tank #5.

From tank #5 liquid will be pumped with a centrifuge feed pump thru a polymer injection/emulsion break chemical injection system to various oil/water separator tanks.

Part 2: Drilling Waste Cuttings Treatment.

Drill cuttings off the primary shaker(Solids Control of the Rig) when brought to site, will be sent to the 2 cuttings dryers(GNCD930) mounted up on a stand to allow front end loader to remove solids from under dryer. Cuttings will be fed to dryers 2 feed augers, the liquids from the dryer will be dropped into 100bbl tank (#6) with 1 agitator. Liquids from the 100bbl tank will be recirculated to dryer and pumped (with a separate centrifuge feed pump) to a high speed VFD controlled centrifuge for processing and oil stored in 300bbl tank(#7) below centrifuge.

From tank #7 liquid will be pumped with a centrifuge feed pump thru a polymer injection/emulsion break chemical injection system to various oil/water separator tanks.

From Wiki about Drilling cutting:

Drill cuttings^[1] are the broken bits of solid material removed from a borehole drilled by rotary, percussion, or auger methods. Boreholes drilled in this way include oil or gas wells, water wells, and holes drilled for geotechnical investigations or mineral exploration.

The drill cuttings are commonly examined to make a record (a well log) of the subsurface materials penetrated at various depths. In the oil industry, this is often called a mud log.

Drill cuttings are produced as the rock is broken by the drill bit advancing through the rock or soil; the cuttings are usually carried to the surface by drilling fluid circulating up from the drill bit. Drill cuttings are separated from the drilling fluid by shale shakers (for liquid drilling fluid), or by cyclone separators (for air drilling). In cable-tool drilling, the drill cuttings are periodically bailed out of the bottom of the hole. In auger drilling, cuttings are carried to the surface on the auger flights.

GN has 3 complete of mud systemfor sale now. They are in stock in our Beijing Warehouse. Originally there are 5 sets of complete rig package for drilling site in Iraq, and we already shipped the 2 of them to Iraq. Because of the bad situation in Iraq, the project is delayed, we will sell the left 3 sets of mud system with 30% discount.

mud system for sale

 If you are interested, welcome to visit GN, we will show you the mud system in our yard.

Applications for the mud tanks:

1000HP/1500HP oil rig complete mud system with Derrick Solids Control or GN Solids Control Equipments.

Specifications of the Mud Tanks System

1 Mud tanks:

7x400BBL Mud Tank for one set

3 sets total capacity=8400BBL

Dimension(LxWxH):1200x2900x2300mm

Including Shaker Tank, suction tank, storage tanks, mixing tanks completed with agitators, mud guns, centrifugal pumps.

2 Solids control equipments for one set:

Option 1:

3x Linear Motion Shale Shaker Derrick FLC2000

1xVacuum Degasser Derrick 1200

1xMud Cleaner with 3x10inch desander and 16x4inch desilter, underflow linear motion shaker Derrick FLC2000

2xDecanter Centrifuge Derrick DE1000

Option 2:

3x Linear Motion Shale Shaker GNZS703

1xVacuum Degasser GNCQ270

1xMud Cleaner with 3x10inch desander and 16x4inch desilter, underflow linear motion shaker GNZJ703-3S16N

Continue reading →

The Drill cuttings Management solution is designed to help maximize compliance with the waste management hierarchy principles, as well as ensuring that local regulations and standards are complied with. Ultimately, disposal will be required in all cases, be it solids and / or liquids.

drill cutting management solution

Drill cuttings management solution usually including but not limit to:

1 collection of drill cuttings

There are various ways to collect the drill cuttings from the solids control system( shale shaker, mud cleaner, decanter centrifuge). Firstly you need a cuttings blowing pump to blow the drill cuttings and waste produced by centrifuge from a collection place in the site to a drill waste storage tank or directly to a transferred truck or boat, they called it ”bulk tank”. Then Screw conveyors are used to transport drill cuttings and centrifuge waste from one location on the rig to another, probably to a vertical cutting dryer in the drilling waste management system.

2 Storage of drill cuttings

A Drilling Waste Container is to storage drill cutting, centrifuge waste and pit cleaning wastes generated during drilling operations. The drilling waste containers are typically transported to a treatment and disposal site for further processing.

After the drilling waste is treated by vertical cutting dryer, the cuttings will be collected by a small waste container and be transported to other place, the fluids are pumped to high speed decanter centrifuge for further process.

Continue reading →