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Monthly Archives: October 2016

Solid control sytem acceptance by Russian clients

In the early winter, DC Solid control finished the production of our standard solid control system within 30 days. Below is the picture of the users senior engineer inspection.

The order of solid control system mainly include 6 sets linear DCS700-3 shale shakers, 3 sets DCQJ250 Mud cleaners, 3 sets DCLW450-1258 decanter centrifuges, 20 sets mud agitataor and 8sets centrifugal pumps.

solid control system

DC Solid control system not only can design equipment for oil and gas field but also can provide perfect system for HDD, CBM, and other on dig drill fields.

Following the development of trenchless field, more and more site require the MiNI-mud cleaning system to remove the big solids. In order to meet it, DC Solid control has standards mud system for your choosing, such as DCGPM500, DCGPM900M, DCGPM1000 and design for according to your special request.

If you have interest with solid control system, welcome to contact us.


Solid control system for trenchless technology field

Trenchless is referred to no dig drilling. It is more and more popular in nowadays construction and life. Configuring solid control system is very important and helpful for trenchless project.

Some times, the projects need to cross throuth rivers, roads, and even the uildings. Trenchless technology lay the pipes and do not dig the ground surface and so using the trenchless drilling rigs. In the drilling process, we need the mud mixing system to make the drilling fluids.


Solid control system for trenchless is smaller than common oil drilling fluid system. The principle and general configuration is same. The mud system should include shale shaker, hydrocyclones, mud tanks, mud hopper or jet mud mixer. But detail design has to be based on actual demand.

Anyway, trenchless mud system should be adaptable, convenient to handle and transfer. It should be small footprint and compact. Since we will configure centrifugal pump, the tank will include necessary plumbing for pumps.

If you want to learn more about trenchless technology, please contact us.

DCZYQ Mud Gas Separator Design Principles

DCZYQMud Gas Separator(Poor Boy Degasser) is a specific degassing equipment of drilling fluid with gas, it is mainly used to remove big bubbles in diameter no less than φ3mm in gas drilling fluid. DC’s Mud Gas Separator has a lot of advantages including reliable safety, better treatment effect, long service life, etc.

mud gas separators

1) Venting Capacity – The capacity to vent gas

This capacity is the rate at which gas can be vented when the seal is operating at its maximum pressure differential when the liquid seal contains only associated liquids from the hydrocarbon influx. A gradient of 0.69 sg (0.3 psi/ft) should be assumed to determine
the maximum pressure differential.

2) Separating Capacity – The capacity to separate gas cut fluid.

The capacity to separate must not be confused with the capacity to vent. Ideally, the capacity to separate should be greater than the vent capacity, but this may not be possible given the low operating pressure and the constraints of the rig layout. In practice, the
capacity to separate may be only 10% of the vent capacity.

3) Liquid (Droplet Size) Re-entrainment Capacity

Entrainment refers to liquid droplets breaking away from a gas/liquid interface to become suspended in the gas phase. The term re-entrainment is used in horizontal-separator design because it generally is assumed that droplets have settled to the liquid phase and
then are returned to the gas phase.

If you want to learn more details of mud gas separators, please contact us.

Rational use of drilling fluid shale shakers

The first line of defense for a properly designed solids control system is the shale shaker. Shakers remove solids from drilling fluid as the mud passes over the surface of a vibrating screen.

Particles smaller than the openings in the screen pass through the holes of the screen along with the liquid phase of the mud. Particles too large to pass through the screen are thereby separated from the mud for disposal.

shale shaker

Without proper screening of the drilling fluid during this initial removal step, downstream equipment will experience reduced efficiency and effectiveness. The downstream hydrocyclones and/or centrifuges (if employed) will simply be overloaded beyond their design capacity.

There are a number of commercial claims that indicate that shale shakers can achieve solid cuts lower than 74 microns, however, when it comes to the practical installation and use of solids control systems (i.e. relative to flow rates, drilling fluid viscosity, screen condition, volume of solids being managed, etc.) operators should conservatively assume 100 microns as the performance limit.

What Is The Working Principle Of Decanter Centriguges

The centrifuge is fed through a stationary pipe, which is inside a hollow shaft connected to the rotating screw conveyor (scroll.) There it enters a feed compartment and is accelerated through feed slots into the rotating bowl. Once inside the bowl, centrifugal forces accelerate the heavy solids, where they settle on the bowl wall. The lighter liquid will fill the bowl to the level of the effluent dam (weirs).

decanter centrifuge

The conveyor is connected to a gearbox and turns slightly slower than the bowl. Since it is turning slower and the helix is angled toward the small diameter (conical end) thus the solids are then conveyed along the bowl wall to the solids discharge end and discharged there.

The liquid flows around the conveyor and exits over effluent dam located on the large diameter end of the bowl. Lighter Solids, which did not settle to the inside diameter of the bowl (floaters), are carried out with the liquid over the effluent dams.


The Effluent dams are adjustable and control the amount of liquid inside the bowl. The Effluent Dam diameter is normally larger than the solids discharge diameter thus creating a Drying section at the Solids discharge end called a beach. The larger the beach the dryer the solids discharge however this will reduce the amount of liquid inside the bowl.
A larger the amount of liquid usually results in a cleaner effluent.

We can offer many different drive systems to operate decanter centrifuge form fully automatic Frequency controlled units to a simple one speed setup.

Based on your process requirements we can thus optimize your decanter selection.

General Rule of shaker screens placement

Pre-tensioned screens are available in different sizes to fit individual systems. Operating conditions should determine screen selection.

Since screen mesh count and screen ratings can significantly impact shaker performance, choosing the correct screen is critical. Each screen directly influences the ability of the shaker to achieve solid/liquid separation and consistent conveyance.

shaker screen

As a general rule, coarser screens are placed on the rear and lower decks, while finer mesh screens are placed near the output. If using a dual deck shaker, finer screens are usually located on the top deck and more coarse screens on the bottom.

Operators should remember that finer screens wear more quickly, especially when subjected to high volumes of solids, such as when top-hole drilling is occurring. Experience will also help guide screen selection regarding flow rate and solids type to maximize solids removal and discharge dryness.

DC all capacities of Self-Contained Mud System for CBM

As we discussed in my blog, DC has provided one set of mud recycling system with dual function for CBM drilling and diamond core drilling. It is quite common that every client has different solids control demands on their worksite.

So DC designers try their best to provide an excellent solids control solutions to meet every client’s special demands.

compact mud system

DC mud recycling system is a self contained packaged system with the function for mud cleaning, mud storage and mud mixing. Moreover the mud cleaning capability can be designed by different users.

Features of DC mud system for CBM

Complete line Mud System: DCG500GPM, DCG300GPM, DCG800GPM, DCG1000GPM Self-Contained Mud System.
Cost Effective Equipments integration:Complete drilling mud equipments from a single source-GN Solids Control Factory.
Fast moved compact system:Small footprint design with fast connection for removable parts and most parts fixed while traveling meet transport regulation.
Mud Tanks Flexible Options:Skid Mounted or Trailer Mounted or Hydraulic Jack Up mud recycling Tanks available for your options.

Besides, about the commissioning and installation, we can send our experienced engineers for installation,and training up customer engineers.


DC 3″ Low Pressure Mud Guns at discount sales

DC solids control manufacture 2” mud gun and 3” mud gun, and we have several sets of mud guns in stock to meet the urgents requirements of any models.

The mud guns are the common type which located on the top tank, sometimes we design it as bottom tank type. Top tank mud gun is controlled by staff on the tank, the difference between DC mud gun and NOV mud gun is the nozzle numbers, we make to 3 nozzle numbers, which can jet more place in the tank so the agitating effect can be better.

mud gun

DC Mud Guns are available for rotation adjustment to allow the operator to optimize the mud guns performance. The replaceable wear resistant jet nozzle is used, which is special design with better shearing.

mud guns

If you have interest with DC Mud guns, please send your inquires to our mailbox, at there you will getting a big discount of it.

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