desilter

With the
development of drilling technology, and the idea promotion of environmental
protection and cost saving, GN Shale Shaker has been more and more widely used in
drilling industry for cleaning the drilling fluid. GN Shale Shaker widely
services the global customers like from Oil & Gas Industry, HDD & CBM
industry, with the customers of HALLIBURTON, BAKE HUGES, SCOMI TOOLS and so on. 

Drilling fluid,
known as the mud, has several different functions to drill an oil or gas well,
including subsurface pressure control and cuttings removal, which also reduces
the friction between drill bit and the wellbore. 

When the Drilling rig is
working, the drilling cuttings that chipped away by the bit goes into the
drilling fluid and its technical parameters like density, viscosity and special
gravity will be changed and could not meet the drilling’s requirements,
seriously the Well Kick or Well Blowout could be happened. 

The drilling fluid circulated
the cuttings to the surface, as the sizes of cuttings in the drilling fluid are
different, in order to promote the treatment efficiency and effect, usually the
cuttings needs to be separated out by adopting multiple-stage separation. The Shale
Shaker is matched together with the Desander, Desilter and sometimes the Decanter
centrifuge is also equipped, to treat the drilling fluid and recover its
physical properties. 

Normally the Shale Shaker is
used as the 1st-stage drilling fluid purification equipment. It is mainly used
for screening out the big size cuttings like over 100μm. The working principle is as below, 

1.     
The
fluid pump circulates the fluid from the fluid pit to the Shale Shaker;

2.     
There
are vibration motors installed on the Shale Shaker. The motors produce shaking
force and the fluid moves on the Shaker Screen.

3.     
The
big size cuttings could not go through the Shaker Screen and are discharged.
The treated drilling fluid will go to the next-stage for continuous cleaning. 

Based on the different requirements of customers
from different industry, GN could provide the standard shale shakers and
customized ones for customer option. Such as different treatment capacities,
different types of shaker screen, different combinations of Shale Shaker with
Desander or Desilter, Desander and Desilter together.

As the top manufacturer of solids control
system & equipment
for oil and gas drilling and mud recycling
system & equipment for HDD drilling, Hebei GN Solids Control Co., Ltd has
always being  leading the technology of
solids control in China. Being the first API certified solids control company
in China, and also certified by DNV CE, Russia TP&TC, Hebei GN Solids Control
has exported to over 60 countries around the world. Early in 2013, GN Solids
America was set up as the first and biggest China owner USA based Solids Control
Company. Unit now, Hebei GN Solids Control Co., Ltd has developed partners in
Australia, Latin America, Africa and the Middle East. With a few years’
development, Hebei GN Solids Control has achieved an international brand GN
Solids Control which targets at medium and high end market customers.

Regarding to the mud recycling system for HDD drilling,
It generally includes 2 or 3 phase treating machines with mud mixing devices.
If it is with 2 phases, the first phase will be shale shaker to separate coarse
solids and then desander cones or desilter cones to separate fine solids. If
with 3 phases, the first phase will be shale shaker,
the second will be desander cones, the third will be desilter cones. Regarding
to the mud mixing device, it is mud mixing hopper with mud mixing pump. In GN,
the standard models are divided by the treating capacity from 200 gpm to
1000gpm, so we have 200GPM, 350GPM, 500GPM, and 1000GPM. Unit till now, over 20
sets operate in Australia for HDD and CBM drilling, also GN delivered one set
for Vermeer drilling rigs to India. If you have any interest to question on GN
mud recycling system, you can contact GN freely.

Where is the drilling mud used, where is
the need for mud cleaning and recollecting unit. Starting from solids
control system for oil and gas drilling
, Hebei GN Solids Control Co.,
Ltd has extend its product line to mud cleaning unit for other kinds of
drilling such as HDD, CBM water well drilling, geothermal drilling, tunneling
and bored piling. Unit now, over 30 sets of mud cleaning unit are delivered to
Australia and New Zealand for HDD trenchless project. So what is HDD drilling?

The full name for HDD is Horizontal
Directional Drilling, commonly known as directional boring with trenchless
method to install underground pipes, conduits and cables in a shallow arc along
a prescribed bore path by using a surface-launched drilling rig, with minimal
impact on the surrounding area. When the trenching or excavating can’t be
carried out because of the environmental protection to the landscapes, road and
river, the HDD is the used. Installation lengths up to 2000 m have
been completed, and diameters up to 1200 mm have been installed in
shorter runs. While when there are voids in the rock or incomplete layers of
rock, directional boring is not practical.

In the mud cleaning system for HDD, there are always 2 or 3 stages
treating machine with a mud mixing device. The first stage treatment equipment
is shale shaker which removes coarse solids out; the second stage treatment
equipment is 10’’ desander cyclone to separate
solids over 40 microns; the third stage treatment equipment is 4’’ desilter cyclone to separate solids over 25 microns. After
the treatment, the clean mud will be added some chemicals and mixed for usage.
Later, GN will bring its 350 gpm mud system to attend a show in Australia. Besides
350 gpm, GN has 200gpm, 500gpm, 800gpm, 1000gpm standard models.

Centrifuge can unweight drilling mud.

1) When processing the active system, the centrifuge feed should be taken from the desilter discharge compartment

2) Provide enough centrifuges to process at least 25% of the circulation rate

3) Run at max bowl RPM to achieve highest G Force and best separation

4) Operate the centrifuge just bellow the flood out point

Decanter centrifuge is a very important part for whole machine to unweight drilling mud.