Month: September 2012

Mud cleaner is a combination of shale shaker, desander, desilter for oilfield drilling mud system, NOV Brandt also called it mud conditioner. There are many suppliers for mud cleaners, Derrick, MI-SWACO, Brandt, GN Solids Control, here we will make a comparison of the 4 model of mud cleaners. Take 1000gpm unit for example:

1 Derrick Mud Cleaner Features:

A round desilter manifold and/or a desander manifold is mounted in a cone discharge collection pan installed over the vibrating screen.Underflow from the hydrocyclones is received by the collection pan, which may feed directly to discharge or onto the vibrating screens for additional processing.

Derrick’s standard desander cone and desilter cone is 10” & 4”

2 MI-SWACO Mud Cleaner features:

Low profile through

Bypass intergral

Vertical installation method of desilter cone

MI-SWACO’s standard desander cone and desilter cone is 12” and 4”

3 Brandt Mud Cleaner

Patented pin-and-hole screen securing system

Brandt’s standard desander cone and desilter cone is 10” or 12” and 4”

4 GN Mud Cleaner

Small footprint, compact design; desilter cone is installed vertical but inclined, GN standard desander cone and desilter cone is also 10 inch and 4 inch, which is same with Derrick’s.

GN mud cleane is convenient to ship it by containers, GNZJ703-2S12N(1000gpm) footprint is only 2403x1883x2195mm, but same treating capacity, Brandt Cobra 16/2 Mud Conditioner dimension is 2692 mm x 2032 mm x 2565 mm. For same treating capacity and function equivalent, GN mud cleaner is with the smallest size.

MI-SWACO CD-250 centrifuge is designed for the purpose to solve a problem that there is no proper model centrifuge for small drilling process application with a compact dimension, for example, HDD, diamond core drilling for mining. It should meet 3 important points: 1 high separation efficiency, 2 tight space, 3 economic solution. GNLW220 centrifuge is designed for the similar purpose.

Comparison of MI-SWACO CD-250 centrifuge & GNLW220 centrifuge

Model	CD-250	GNLW220
Brand	MI-SWACO	GN Solids Control
Length	2333mm	2020mm
Width	730mm	980mm
height	1174mm	755mm
Bowl diameter	253mm	220mm
Bowl length	941mm	930mm
Rotary speed	0~4500rpm 4000rpm operation speed	0~4800rpm 4000rpm operation speed
G-force	2773G @4500rpm	2835G@4800
Weight	1010 KGS	1000KGS
Separation capacity	93gpm@ 9lb/gal mud	75gpm @4000rpm
Solids discharge rate	19gpm max	15gpm
PLC control	For option	For option

Both of them are very compact footprint units, and designed with easy maintenance in the field and continues operation in harsh environment. Compared with CD-250 centrifuge, GNLW220 is more competitive in price and delivery time, they are function equivalent.

Continue reading “MI-SWACO CD-250 centrifuge V.S. GN centrifuge”

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.

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 “Centrifuge mud tank”

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.

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 “Auger screw for oilfield”