Drilling mud Equipment

Shaker screen is the most important parts for shale shaker. Suitable screen size and reliable screen quality can greatly reduce drilling cost. And good design shale shaker can prolong lifetime of shaker screen.

Screen size usually indicated by mesh size or API size. Many clients wonder: what is difference of mesh size and API size? can they convert to each other?

Definition of mesh size:

Mesh count is the number of opening per inch in directions perpendicular to each other and parallel to the screen wires. For example, a 40-mesh screen would have 40 openings per inch in one direction and 40 openings per inch in a perpendicular direction. In an effort to eliminate calling the screen a “40 by 40” screen, the common terminology resulted in calling the screen a 40-mesh.

During the 1960’s, the throughput volume was increase by making rectangular openings. If the mesh count was 20 opeings in one direction and 40 openings in a perpendicular direction, the screen would be labeled a 20×40 mesh. The marketing ploy, however, was to label the screen with a letter and then the number 60. This implied to many that the screen was a 60-mesh screen.

Although this was not stated explicitly. Rig crews were happy because the “fine-mesh” screens could handle more flow than a normal square-mesh screen. After rectangular screens became common, shale shaker throughtput was increased again. by mounting one screen on top of another screen instead of using only a single layer, see figure.

This layering created even more of a description problem because the opening were now non-uniform and difficult to describe. In the sketch, one square mesh screen is shown superimposed over another square mesh screen. A variety of opening resulted that cannot be described by a single number.

API size

In an effort to better describe multilayered shaker screens, API issued API RP13.

API is used to identify the largest solid that would pass through each screen (or the smallest solid captured by the screen); this is called D100. Solids smaller than D100 will pass though a D100 screen. Each screen manufacturer have its own D100 count (screen openings microns), but the micro court should among the same scope related a a certain API count. For example: D100: 137.5 ~165.0 equaled to API 100.

See below charge:

 

Extractor,  most commonly called vertical cutting dryer,it is the main equipment for drilling waste management. GN Extractor utilizes centrifugal force to dry drilled solids in oil or synthetic based fluids.

In extractor (cutting dryer), a stainless steel screen bowl traps “wet” solids and accelerates them up 900RPM with G force up to 420. Liquid is forced through the screen bowl openings, while “dry” solids are extracted by the angled flights attached to the cone, which rotate slightly slower than the bowl. Tungsten carbide protects the flights from abrasive solids and ensures long operational life. This aids in maintaining a constant gap between the scroll and screen bowl, which is crucial for proper operation.

GN extractor (cutting dryer) has been done strict balance testing for all major rotary components to minimize vibration & noisy.It is the ideal products for oil based drilling waste management.

How waste management system processing (oil based mud):

1) cuttings from shale shaker, desander,desilter comes into verticalcutting dryer through screw conveyor (auger)

2) After treatment of extractor:

a. useful mud back to recycling system for dilling.

b. waste solids discharged

c. recycled drilling fluids comes into GN Decanter Centrifuge for recovering.

What mud cleaner is:

Mud cleaner, also called mud conditioner, were developed in the early 1970s to remove fine drilled solids from weighted mud without excessive loss of barite and fluid. It is also proved valuable tools in closed systems and other applications. Mud cleaner use a combination of desander and/or desilter hydrocyclones and very fine mesh vibrating screens (120-400 mesh) to remove fine drilled solids while returning valuable mud additives and liquids back to the active mud system.

 Hydrocyclone sizes of mud cleaner

are designed arbitrarily by the inside cone diameter at the inlet. By convention, desanders have a cone diameter of 6 inches and larger; desilters have internal diameters smaller than 6 inches.

Normally, discharges from the apex of mud cleaner cones are discarded when used on unweighted drilling fluids. Prolonged use of these cones on a weighted drilling fluid will result in a significant reduction in drillingfluid density caused by the discard of weighting material. When these cones are used as part of a mud cleaner configuration, the cone underflow is presented to a shaker screen. The shaker screen returns most of the barite and liquid to the drilling-fluid system, rejecting solids larger than the screen mesh. This is a common application of unbalanced hydrocyclones, since the cut point is determined by the shaker screen and not the cone.

GN ZJ series mud cleaner

chooses 10’’ desanser cone and 4’’ desilter cone as standard configuration. According to capacity requirements, mud condition and underflow shaker model, 10’’ desander cone option from 1~3, and desilter cone option from 8~16.

Here is an usual combination of desander cone and desilter cone :

1×10’’ cone with 8×4’’ cone;

2×10’’ cone with 12×4’’ cone;

3×10’’ cone with 16×4’’ cone;

Acrroding to detailed insite situation, desander / desilter cone number and be increased or reduced to enable a better performance.

World top 5 mud cleaner brand:

Top 1: Derrick

Top 2: Brandt

Top 3: Swaco

Top 4: GN Solids Control

Top 5: Kem-tron

Big capacity mud tanks on promotion now. The tanks from world top solids control and drilling waste management manufacturer- GN Solids Control.

Specifications of the tanks:

1) 7x400BBL Mud Tankfor one set

2) 3 sets total capacity=8400BBL

3) Dimension (LxWxH):1200x2900x2300mm

4) Including Shaker Tank, suction tank, storage tanks, mixing tanks completed with agitators, mud guns, and centrifugal pumps.

Option items: Shale Screens

With Coverage roof for Sun and Rain protection.

This is optional for buyers.

Equipments can mounted on the tank:

1) 3x Linear Motion Shale Shaker : Derrick FLC2000 or GNZS703Model

2) 1xVacuum Degasser: Derrick 1200 or GNCQ270

3) 1xMud Cleaner with 3x10inch desander and 16x4inch desilter, underflow linear motion shaker:Derrick FLC2000 or GNZJ703-3S16N

4) 2xDecanter Centrifuge: Derrick DE1000 Or GNLW363

The configuration for above is flexible,you can choose not ot have centrifuge or degasser or less shakers etc.

The tanks can be used for 1000hp or 1500hp drilling rig mud system. Some clients buy them as storage tank or water tank as the good price. Both good choice.

GN Solids Control offer mud agitator various from 5.5kw to 15 kw.

How to choose the right agitator model for your tank?

It depends on following:

1) tank/tank compartment inner dimention,usually, every 3 meters in tank length, there should be an agitator

2) identify voltage & hz of explosion proof motor

3) density & viscosity of fluids

Agitator Shaft

According to tank inner depth.

Shaft Stabilizer for agitator

While tank depth over 8′ , stablizer for agitator shaft  is necessary, to fix shaft in tank.

Shaft stabilizer welded on tank bottom.

Impeller

Impeller diameter various from 20’’ to  52’’,depends on tank dimension.

As suggested by GN Solids Control, for motors below 11kw (5.5kw. 7.5kw), single shaft is ok.

For motors over 11kw (11kw,15kw) single impeller and double impeller both acceptable.

While impeller more then 1 layer, the up impeller mounted near to mud surface, the down impeller mounted to 0.75 times of impeller diameter. Namely, for 20’’ impeller, it should mounted 15’’ above tank bottom.

Replacement screen for Derrick have different type of wire cloth. Many clients send us mail to inquire difference of Shaker Screen wire cloth type. Below we list the definition of each Shaker screen wire cloth type.

DX^TM = Extra Fine Screen Cloth

HP^TM = High Performance Screen Cloth

DF^TM = Fine Screen Cloth

HT^TM = High Temperature

SCGR = High Tonnage Capacity Rectangular cloth

P = Slot length runs parallel to the hook strip (preferred for the oilfield)

R = Slot length runs at a right angle to the hook strip

 

GN Solids Control is one of China top manufacturer on solids control & waste management & shaker screen. Besides replacement screen for Derrick shaker, GN Solids Control and make most kinds replacement shaker screen for Brandt, MI-Swaco, Kem-tron. As the top quality and competitive price, GN replace cement shaker screen, especially the replacement screen for Derrick shaker, Brandt shaker are hot sold worldwide.

For more information , please contact GN or visit GN website to get price more more information of GN replacement screen for Derrick shaker or other GN solids control equipments.

World top solids control manufacturer have exported GNLW363 centrifuge to Egypt for drilling waste management.

 

Function of decantering centrifuge in oil field:

Decanting centrifuge is ideal choices for separating particles in drilling mud. Decanting Centrifuge separate the suspending fluids using  the principle of centrifugal action, the suspending fluids is pushed into the rotor drum through the inlet pipe and the fluid hole of the spiral feeder. Under the influence of centrifugal force, solid phase particles are pushed to the internal wall of the drum, then to the nud export of the small end of the drum and excreted.

 

GN LW series centrifuge is designed for oil field. GN have different model for your different application from solids control and waste management.

 

GNLW363 decantering centrifuge is hot sold as its perfect performance for waste management & high cost-effective.

GN offers fixed speed and VFD control for GNLW363 centrifuge.

Below are detailed specifications of GNLW363VFD centrifuge:

Model : GNLW363VFD

Bowl Diameter:  360mm

Bowl Length:           1270mm

Bowl Speed:  0~3400RPM

Max Capacity:  30m3/h (132GPM)

Separation Point:  ≥2microns

G-Force:        2330(Max)

Main Drive:      30Kw

Back Drive:   7.5Kw

Solids Discharge Port: Interchangeable tungsten carton alloy ring

VFD Control:  SIEMENS VFD,and Scheider Components

VFD Type: Pressurized VFD Control Panel for High Temperture Area

3 VFD: for main driver & back driver & feeding pump

Main Body Material: S.S. 316L

Screw Protection:  Tungsten alloy tile

 

If interest, contact GN at sales@gnsolidscontrol.com for more information.

Functions of drilling mud:

Drilling mud is used to control subsurface pressures, lubricate the drill bit, stabilize the well bore, and carry the cuttings to the surface, among other functions.

 

Why solid cutting should be separated from drilling mud:

As the drill bit grinds rocks into drill cuttings, these cuttings become entrained in the mud flow and are carried to the surface. In order to return the mud to the recirculating mud system and to make the solids easier to handle, the solids must be separated from the mud.

 

How to separate solid cutting from drilling mud:

In order to recycle drilling mud, solids control equipments are used, usually 4 stage solids control equipment used.

1)       First stage: Shale shaker

According to rig size, 1 or 2 or 3 sets shale shaker will be used at the first stage solids control separation.

Usually matched with API 60 or API40 shaker screen.

Cutting over 400µm will be separated in this stage.

 

2)       Desander and desilter is used as the second and third stage separation. For better performance, GN recommend to bear a underflow shaker with desander / desilter.

Some clients may choose mud cleaner for these stages. It is a combination of shake shaker, desander and desilter. But more compact with less space.

 

For smaller size rigs (usually, under 750hp), mud treated by shale shaker and mud cleaner can be used for drilling.

 

3)       In some condition, while drilling depth is big, and high standard mud request, decantering centrifuge will be used as forth stage separation. Finer solids can be separated.

4)       For gas cut drilling mud, vacuum degasser, poor boy degasser and ingnition device will be used.

 

As one the leading solids control specialist worldwide, GN Solids Control offers complete line equipments for drilling mud recycling. GN is the only one China private supplier for drilling waste management. Visit GN website for more information or contact GN at sales@gnsolidscontrol.com

Microtunneling slurry separation is very important for the drilling effieciency of the TBM machine.As a leading export for Solids Control  Decanter Centrifuge ,Liquid/Solids separation equipment manufacturer,GN have the total solutions for microtunneling contractor of the slurry

separation.

GN Normal Slurry  Separation equipments including Shale Shaker,Desander,Desilter Mounted on mud tanks.For fine solids separation.GN have the big bowl big volume GNLW553  Model Centrifuge available.

Slurry Separation for Microtunneling with Decanter Centrifuge Process.

Primary solids removal is accomplished by GNZS853 H G Dryer  with 7.5 G’s of consistent acceleration, outfitted with 0.3mm screens.

After the primary separation, a 100HP centrifugal pump is used to feed three (3) 12” sand separator cones with underflow regulators. Oversized material recovered from the sand separators is fed to another GNZS853 High G Drying Shale Shaker with API-120 mesh openings for further dewatering and discharge into the muck pit.

Because of the size TBM, and the amount of fine solids that could be generated, a GNLW553 big bowl big volume high speed, decanting centrifuge with VFD control was selected to maximize fine solids removal. This unit offers up to 500 GPM and 15-20 t/hr of solids removal.

GN is one of the very few companies who have all complete line equipments available for Solids Control including the big bowl big volume

decanter centrifuge .

Features of GN Decanter Centrifuge

• Southwest Petroleum University Technology Support
• High Speed up to 3200RPM & Variable Speed by frequency converter
• The main body of the decanter centrifuge made from stainless stee:SS304/SS316/Titanium Alloy
• The screw propeller and solids discharge made from stainless steel Stainless Steel protected by  tungsten carbide alloy.
• German FAG/SKF Brand Bearings
• Screw propeller & Solids Discharge Stainless Steel protected by  tungsten carbide alloy.
• Solids Liquid separation system package available
• Eletrical Components: SIEMENS/Schneider/ CHINT

Trailer mounted mud system are very popular for HDD drilling,CBM drilling and Water well drilling.GN also have the Trailer mounted mud system for oil workover drilling rig.

For any drillers,when they decide to buy the mud system,the have options for the type of the mud tank.Normally it is skid mounted mud tank,trailer mounted mud tank and Hyraulic Jack up mud tank.With the design and manufacture capability.GN Solids Control is able to design all of the above type mud system for your different drilling applications.

GN Trailer Mounted mud sytem models for HDD water well,and CBM drilling: GN 200 GPM, GN 350 GPM,GN 500 GPM,GN 800 GPM,and GN 1000GPM.

GN Trailer Mounted mud sytem for Workover oil drilling rigs:350HP 450 HP 550HP 650 HP 750 HP workover rig mud system available.The system is completed with Solids control equipment and mud agitators ,mud guns.

 

Features of GN trailer mounted mud cleaning unit

• 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.
• Assured customer service:We can send our experienced engineers for installation,and training up customer engineers.
• Compact Tank design: Easy moving,and complied to raod regulations for most areas in the world