Monthly Archives: October 2016

High “G” force linear motion shale shaker of DC Solid control

Primary solids removal is typically performed by shale shakers, or vibrating screening machines. It is critical to remove as much material as possible with the shakers, to minimize the amount of solids going into the mud tanks and being hydraulically fractured by the centrifugal pumps and slurry circuit.

Shale shakers are built in various configurations, such as single and double decks, and with different types of motion. Over the years, high “G” force linear motion has proven to be the best type of shaker motion to handle almost any type of ground condition.

shale-shakers

Higher G shale shaker breaks surface tension and reduces viscosity in shear thinning drilling fluid, which allows more fluid to pass through the screen. Faster solids conveyance uncovers more screen open area, which allows more drilling fluid to pass through the screen.

This helps the shale shaker handle more fluid and solids, run finer screens and discharge drier cuttings. Some of the leading shakers in the marketplace today, such as the DCS Series Linear motion shale shakers, are capable of producing a continuous 8 Gs of acceleration.

Highlights of DC Mud gas separators

DC mud gas separators are designed to provide safe drilling procedures during horizontal, underbalanced, h2s, or high pressure drilling. Our gas buster captures and separates the mud/gas then safely vents free gas to the flare line to be burned off while returning mud to the mud pits.

mud-gas-separators

Our mud gas separators are intended to sustain safety for high pressure wells or when sour gas may be present. Our units are closed bottom skid mounted model designed around safety and precision. Uniquely designed baffles break up mud and gas which is then expelled by the gas vent line to the flare line.

Highlights of the mud gas separators

1. Designed for horizontal, underbalanced, h2s, or high pressure drilling
2. Numerous size specifications available
3. ASME Sec VIII Div 1 Code Vessels
4. Unique Baffling
5. External Pressure Gauge
6. H2S certified with internal coating

We manufacture numerous size specifications including 4’x20’ and 6’x20’ and are capable of producing vessels of all sizes. If necessary the lines can be modified with flanged concentric reducers to your desired piping size. The run of the gas vent line continues to ground level for safe and efficient hook up to the flare line piping.

The liquid gas separator is manufactured for efficient installation from one rig move to the next. DC offers rig up of our gas buster and if needed can tie in and/or modify all lines from choke manifold to trip tank, frac tank, panic line, gas buster, and flare line. We supply competitive and cost effective connect and disconnect fees of our equipment.

 

Shale shakers “heart and soul”- shaker screen

Basically, a screen acts as a “go/no-go” gauge: Either a particle is small enough to pass through the screen or it is not. Screening surfaces used in solids control equipment are generally made of multi-layered woven wire screen cloth and are the “heart and soul” of the shaker.

Fundamentally, the quality of a shaker is defined by the quality of screens it utilizes. When selecting a solids control system it is important that the quality of the screen manufacturing and level of experience by the in manufacturing screens is considered.

shale-shaker

If the system is appropriately set up with a scalping system and a fine shaker screen system, the scalping screens must be sized just coarse enough to ensure that drilling fluid does not sheet off the shaker (i.e. whole mud losses). This happens when the scalping screen is too fine to allow the drilling fluid to pass into the solids control system’s dirty tank.

shaker-screen

Typical scalping screen configurations for HDD applications range from 50 mesh (API 50) to 120 mesh (API 100). Typical fine screen configurations range from 160 (API 120) to 200 mesh (API 170). The API 13C classification is gaining traction in the HDD industry as more contractors focus on the micron cut point they are trying to achieve in their fluid.

Relative to the use of shaker screens, it is the size of the screen openings, not the mesh count that determines the size of the particles separated by the screen. It is because of this fact that HDD system users should compare and specify screens based on their API 13C designation.

The bowl of DCLW450X1350N(VFD) centrifguge

The Bowl of DCLW450X1350N(VFD) centrifguge comes with a standard “VFD Ready” drive system which allows for full variabilityon both the main and back drive motors through VFD’s. The bowl is driven by a 45KW inverter duty main drive motor and the conveyor is driven through a planetary gear box (49:1) with a 11KW HP inverter duty back drive motor. The MegaBowl™ is engineered, plus more than twice the processing capacity.

SONY DSC

SONY DSC

All major rotating assembly components are manufactured from centrifugal castings or forgings of either Duplex 2205 SS, or 316 SS. Bowl of DC centrifgues case is 316 SS. All major wear areas are protected with tungsten carbide and/or Stellite. This unit is manufactured to operate in a Class 1, Division 1 environment.

bowl-of-centrifuge

Main parameters of DCLW450X1350N(VFD) centrifguge:
1. Bowl length is 1350mm and diameter is 450mm.
2. The max treating capacity is 60m3/h
3. Matched 45kw main drive and 11kw back drive.
4. Bowl speed(VFD) is 0-3200rpm.

The High-speed DCLW450X1350N(VFD) variable frequency centrifuge with its unique advantages, is increasingly favored by more and more users. Welcome to at home and abroad send inquires to DC Solid control.

Staged of Mud Separation Systems

Drilling mud’s use in oil and gas operations can be simplified with an efficient and effective separation system. In the past, mud was discarded and not recycled or reused. This was costly and wasteful. Mud separation systems remove debris from the reusable mud.

Two new, three-phase liquid-solids environmental separation systems have been developed.
The system is made up of three phases that condition, clean and separate the mud for reuse. These phases are performed in a continuous and in-sync operation with final discharge controlling the entire operation.

Phase One

In Phase One, the slurry is passed over an unbalanced elliptical shale shaker to remove the large material. This phase removes all large foreign items that are larger than 30 mesh.

phase1

Phase Two

After the larger foreign material is removed, the remaining slurry passes through the first set of 4-inch hydrocyclones in Phase Two. This phase removes finer sands and coarser silts. The hydrocyclones’ underflow is deposited on an elliptical shale shaker screen for drying. The screen selection size is adequate to capture and dry the silts and sands. Cuts are down to 30 microns.

phase2

Phase Three

The slurry then passes through a second bank of 2-inch hydrocyclones to make the final cut, which includes the fine silts and non-hydrated clays. The underflow from these hydrocyclones is deposited on an elliptical shale shaker screen for drying. Screen selection plus clay piggybacking are adequate to capture and dry the fine silt sand clays. Cuts are down to 10 microns after this phase.

phase3

Vertical Cuttings Dryers Improve Mud Recovery & Solids Control System Performance

Modern drilling rigs are continuing to set standards by drilling deeper, faster and longer. As such, the oil and gas industry has seen a substantial increase in the volume of waste solids and liquids being generated from the solids control system.

here has never been a more critical time to manage drilling fluid and the associated wastes as an integral and inherently inseparable element of an effective solids control system. This is especially the case when a properly deployed vertical cuttings dryer (VCD) can significantly reduce waste disposal costs, dramatically lower whole mud losses within those wastes, and improve the overall quality of the drilling fluid by allowing the shale shakers and centrifuges to be used at their full operating potential.

vertical-drilling-cutting-dryer

Common flow-line shaker cuttings can maintain an oil-on-cuttings (OOC) or water-on-cuttings (WOC) moisture content as high as 25 percent. As such—and on a conservative basis—an average well will lose approximately 5 gallons per minute of drilling fluid with the discarded flow-line shaker cuttings.

Decanter centrifuges and VCDs share several similarities; however, their objectives are quite different. Centrifuges are deployed to cut waste solids from the liquid stream. The cut is usually called the underflow (also solids discharge or cake), and the cleaned liquid stream (or centrate) is usually called the overflow.

DCJBQ extreme-duty mud agitators for sale

Mud agitators are an important part of the mud solids control system. DC offers a variety of motor and impeller sizes to fit specific tank configurations.

DCJBQ extreme-duty mud agitators featuer the rugged and reliable Nord gear box for long-lasting performance. Along with the gearbox, all our Mud Agitators include an explosion proof motor, impeller and shaft assembly.

SONY DSC

SONY DSC

DC uses a Helical-Bevel gear unit to turn the impeller. This highly efficient gearbox offers a 95% power transfer, which is approximately 30% more than a worm drive gearbox. Helical-Bevel gearboxes are preferred over worm gear arrangements because of their power efficiency, reliability, and lower operating temperatures.

DC mud agitator is available in both horizontal and vertical configurations – sizes range from 5 to 30 HP. Derrick agitators carry a one year warranty. Welcome to your inquires.