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Monthly Archives: December 2014

Using effects of vacuum degasser

A degasser is a piece of industrial equipment used during oil and gas drilling operations. It serves as part of a mud system, and is designed to remove gaseous contaminants from drilling fluid.

vacuum degasser

A form of vacuum degasser is utilized in water treatment facilities to greatly reduce the overall gas pressure in a containment vessel. The pressure inside the vessel is usually lowered by means of a pump or blower. The containment vessel for this process is typically constructed of aluminum, fiberglass, or steel.

These units are positioned downstream from mud gas separators, gumbo removal equipment (if utilized), shale shakers and mud conditioners (if utilized), while hydrocyclone desander and Decanting centrifuges follow in the arrangement.

Vacuum degassers are also used in a variety of applications. Small kit vacuum degasser made from polypropylene and polycarbonate materials can maintain vacuum pressure for up to 24 hours and can be used with a vacuum control manifold to allow for fingertip control of vacuum pressure.

The main component of centrifuge

Drilling fluid decanting centrifuge used for recovery barite to remove small solid particles, reduce the mud solid content, to ensure the performance of the drilling fluid. The drilling fluid decanting centrifuge is driven by two motors. The drum and spiral rotate together in the same direction, but at different speeds . Separate the solid phases in the drilling mud by the centrifugal sedimentation principle. Now let’s discuss the main component of the centrifuges.


Drum- scroll

The scroll is located within the drum and is mounted bu a collar fitting to the main horizontal shaft of the former. They both turn in the same direction but at slightly different speeds, so that the solid product is drawn along axially, sedimenting and completing its formation as it moves; at the end of its movement it accumulates in the truncated cone where it is drained of liquid and expelled from the machine.



Transmission from the motor to the drum is effected by a hydrodynamic coupling and belt drive.
The internal scroll is driven by a belt drive from the drum, using epicyclic train reduction gearing.
The individual parts in the transmission are specially produced to obtain the optimum processing relationship between drum and scroll speeds.
A mechanical device is located in the drum-augur transmission chain, representing its weakest point, and protecting the reduction gearing, and other moving parts, from any excessive strain that might occur in the drum coupling during processing.



Why drilling users choose DC Solid control

DC Solid control is a cost-effective system for recovering oil-based mud (OBM) that might otherwise be included in the drill cuttings waste generated during the drilling process. High-efficiency drying shakers mounted on fluid recovery containment tanks. Drill cuttings discharged off of the rig shakers are further processed on the drying shakers to increase the amount of environmentally sensitive and high cost oil-based fluid recovered.

Solid control system


This additional recovered fluid directly reduces the drilling costs as it can be re-used versus adding more new drilling fluid. And, the costs associated with disposing of the oil covered cuttings are reduced with less solidification material needed―saving material, transportation, and landfill costs. DC Solid control can also be equipped with a high pressure wash system, vacuum system, and shale bins to meet your site’s requirements.

Additional Benefits of DC Machinery

Linear motion vibrators are capable of generating 5 Gs on the drying shaker.
Variety of screen mesh sizes maximizes efficiency with varied mud conditions.
Adjustable deck angle optimizes retention time.
Containment tank comes with sloped bottom & integral flush system.
Submersible pump transfers drilling fluid back to the active mud system.


Additional Features of DC Machinery 

Recovers maximum drilling fluid volume for re-use in active system.
Minimizes stabilizer (sawdust / fly ash) volumes.
Minimizes waste volumes, saving transportation & landfill costs.

And, using our auger tank in combination with our centrifuges results in true, measurable cost savings as well as maintenance of good environmental drilling practices.

Drilling fluid desander and desilter

Desander and desilter are the second and third class separation equipment in the solid control system. Desanders and desilters are solid control equipment with a set of hydrocyclones that separate sand and silt from the drilling fluids in drilling rigs.


Desanders are installed on top of the mud tank following the shale shaker and the degasser, but before the desilter. Desander removes the abrasive solids from the drilling fluids which cannot be removed by shakers. Normally the solids diameter for desander to be separated would be 45~74μm, and 15~44μm for desilter.


Desilting and Desanding hydrocyclones are made from high density abrasion resistant polyurethane. The unique internal manifold design minimises the back pressure on the hydrocyclones maximising the solids removal. Fine tuning is achieved through adjustable orifice openings at the discharge point on the cone.

Features & Benefits of Drilling Desilter and desander

1. Clamp type for easy maintenance.
2. Compact design with small footprint.
3. 100% Polyurethane(PU) material for oilfield drilling fluids desilter cones with longer using life.
4. Flexible fast connection is available for user assembly.
5. Flexible options for 2, 4, 6, 8 or 10, 12, 16 for different capacities.

Both Desilters and Desanders are available in a large range of configurations including stand alone, over a shaker as a mud cleaner or packaged with a supply pump as a mobile desilting unit. Please contact DC Solid control office to discuss applications and appropriate technical specifications.

How to works of drilling mud agitators

Industrial drilling mud agitators and mixing equipment for oil & gas exploration.

DC Machinery Systems supplies oil & gas operators with industrial drilling mud mixer agitators for mud tank mixing. The DC Solid control mixing process quickly allows drillers and operators to ensure homogenous mud consistency for their drilling mud needs.

mud agitator

How it works:

The DC Solid control mud agitators produces powerful, sequentially timed pulsed of compressed air to generate large bubbles at the bottom of the mud holding tank. The rising air bubbles create immediate vertical circulation of the drilling mud and stirs the entire mud tank from the bottom up. Accumulator plates are attached to the mud tank bottom and introduce the compress air bubble.

The burst of compressed air from underneath the plate scours the drilling mud tank bottom and efficiently lifts solids and heavier liquids up into the tank. This “bottom-up” vertical mixing process keeps solids is suspension, ensures uniform mud consistency and level in the tank.

This type of drilling mud mixing process is faster and more energy efficient than top entry mixers or jet mixers. Regardless of the holding tank geometry or hull design, the drilling mud agitator can be custom designed to fit any size drilling mud mixer to help improve the overall efficiency of the drilling site.

Clients feedback of DC Linear motion shale shaker

Shale shakers are the primary solids separation tool on a rig. After returning to the surface of the well the used drilling fluid flows directly to the shale shakers where it begins to be processed. Once processed by the shale shakers the drilling fluid is deposited into the mud tanks where other solid control equipment begin to remove the finer solids from it.

shale shakers

At present commonly used shale shaker is the linear motion shale shaker. The linear motion shale shaker uses two motors vibrate in-phase for separation. The electric vibrator and the electric equipment in the electric control system are imported explosion proof appliances. The linear motion shale shaker is constituted by five parts: foundation, screen case, mud case, dip angle regulation equipment, electrical control system.

shale shaker

One Australia clients choose DC linear shaker because of it’s better performance . They used Kem-Tron shaker and other equipments before but now choose DC linear motion shaker. We manufactured the mud cleaner to work together for this clients too. The clients said” DC linear motion shale shaker and system is the most economical and we will using DC Solid control system in all our rigs”

If you want to know more about DC Solid control, please contact us soon.

What is the effect of using mud gas separator

During well control operations, the main purpose of a mud gas separator is to vent the gas and save the drilling fluid. This is important not only economic reasons, but also to minimise the risk of circulating out a gas kick without having to shut down to mix additional mud volume. In some situations the amount of mud lost can be critical when surface volume is marginal and on-site mud supplies are limited. When a gas kick is properly shut in and circulated out, the mud gas separator should be capable of saving most of the mud.

There are a number of design features which affect the volume of gas and fluid that the separator can safely handle. For production operations, gas oil separators can be sized and internally designed to efficiently separate gas from the fluid.

mud gas separator

This is possible because the fluid and gas characteristics are known and design flow rates can be readily established. It is apparent that ‘gas busters’ for drilling rigs cannot be designed on the same basis since the properties of circulated fluids from gas are unpredictable and a wide range of mixing conditions occur downhole. In addition, mud rheological properties vary widely and have a strong effect on gas environment.

mud gas separator

For both practical and cost reasons, rig mud gas separators are not designed for maximum possible gas release rates which might be needed; however, they should not handle most kicks when recommended shut-in procedures and well control practises are followed. When gas low rates exceed the separator capacity, the flow must be bypassed around the separator directly to the flare line. This will prevent the hazardous situation of blowing the liquid from the bottom of the separator and discharging gas into the mud system.

Problem and maintenances required on Screw pumps

Generally we have very less problems associated with screw pump but yes some problems occur. To make things simpler, let’s discuss the problems which may occur on this pump.

1. The clearances between the screws increases, which results in a decrease in pressure.
2. Bearings may wear out.
3. The relief valve does not function properly.

screw pumps

So these were some of the problems which we face in screw pumps.Let’s discuss the maintenance which are done with this pump.

1. Checking the clearance between the screws and rectifying it.
2. Bearings lubrication and oiling.
3. Checking and testing the relief valve.

Material used in making different parts of the screw pump. Followings parts are made with the metals described below:

1. Casing: Generally made of cast iron.
2. Screw shafts: Made of high grade carbon steel.
3. Bearings: High speed steels.

Horizon Oil Spuds Nama-1 Exploration Well in PPL 259 in Papua New Guinea

Australia’s Horizon Oil Ltd. reported Friday that the Nama-1 exploration well in PPL 259, Western Province, Papua New Guinea (PNG), was spud at 1000 hrs local time Dec. 4. The current operation is running in the 18.625 inch casing following drilling of the 24 inch conductor hole. The well is being drilled by Horizon Oil with Parker Rig 226 and is anticipated to take about 36 days to drill to a planned total depth of 11,266 feet (3,434 meters).


Nama-1 is located 12.4 miles (20 kilometers) due east of the Stanley Development, in which all wells found condensate-rich gas in the Late Jurassic Kimu and Early Cretaceous Toro Sandstones.

If successful, the Nama prospect has the potential to be about the same size as the Stanley field (certified at 399 billion cubic feet of gas and 13 million barrels of condensate).

Ketu Petroleum Limited (a subsidiary of Horizon Oil Limited) – 35 percent
Eaglewood Energy (BVI) Ltd – 45 percent
Osaka Gas Niugini E&P Pty Ltd – 10 percent
Mega Fortune International Limited – 10 percent

Design features of Submersible slurry pump

Submersible slurry pump is with structure of vertical single stage and single suction system overhung centrifugal pump,it is made of abrasion-resistant alloy,it can convey medium with high concentration particle.

Slurry pump

Submersible slurry pumps Design Features

Electrically driven which matched many motors, 3-75kw, 1430-1480 RPM, 380V to 550V
Flow from20- 280 m3/h
Head (Max. discharge pressure) from 10-38 m (3.8 bar)
Horizontal pumping distance up to 750m
Submergence depth 28m H20
Construction features permit full operation in fully, part or non-submerged conditions.

submersible slurry pumps

The submersible slurry pump for the steel-rolling vortex pool comprises a submersible slurry pump, wherein a guide cylinder is sleeved on the lower part of the submersible slurry pump; a sealed submersible motor is arranged in the guide cylinder; a rotating shaft of the submersible slurry pump extends out of a suction port in a lower end face of the submersible slurry pump and is coaxially fixed to an output shaft of the submersible motor through a coupler.

You are welcome to contact with us to get more detailed infos, we will supply cost-effective Submersible slurry pump and satisfactory pre-sale, sale and after-sale technical services.

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