centrifuge

Functions of decanter centrifuge speed for VFD and PLC system

Normal
0

7.8 磅
0
2

false
false
false

EN-US
ZH-CN
X-NONE

/* Style Definitions */
table.MsoNormalTable
{mso-style-name:普通表格;
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-qformat:yes;
mso-style-parent:””;
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.5pt;
mso-bidi-font-size:11.0pt;
font-family:”Calibri”,”sans-serif”;
mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;
mso-hansi-font-family:Calibri;
mso-hansi-theme-font:minor-latin;
mso-font-kerning:1.0pt;}

Decanter centrifuge is widely used for drilling rig mud system; it can be used from barite recovery, fine solids separation, as well as for waste management. It is utilizing different speed to vary G force and to separate different size solid particles from drilling fluids. In this case, centrifuge G force is very important for the performance.  

How to change decanter centrifuge speed for VFD and PLC system

It is actually differential speed what decides G force. Differential speed have relationship with bowl speed, gearbox input speed and the gearbox ration. Gearbox ration is usually a fixed figure for a certain decanter centrifuge model. Below is the relationship of them:

Differential Speed = ( Bowl speed – Gearbox input speed) / Gear Box Ration

 Take GNLW363VFD decanter centrifuge as an example, Gear Box Ration=57. Blow speed and gearbox input speed (conveyor speed) is changeable; they can be set on the PLC touch screen of the VFD centrifuge.  

decater

So Gearbox input speed=Bowl Speed – 57×Differential Speed= Small Motor Speed transferred to gearbox by belt, in some occasions, it is also called conveyor speed.

 Below we see 2 examples

Case 1) Bowl speed=3200RPM, and Differential Speed=30RPM

Gearbox Input speed=3200-57×30=1490RPM ,

Case 2) Bowl speed=1200 RPM, differential speed=35 RPM

Gearbox Input Speed= 1200-57×35= -795RPM it is a negative number.

Above situation, you can see, sometimes the gear box speed is  a positive number, that means small motor running according to the Arrow on the belt cover. Watching from feeding tube side the small motor rotation is Anticlockwise.

The motor speed is changed for some condition. GN brand VFD centrifuge have program to control the motor speed and motor direction. It can changed automatically when necessary.

 

 

Mud tank is widely used in drilling rig mud system. Per different function, there usually water tank, diesel tank, brine water tank, shale shaker tank, sank trap tank, active tank, storage tank, suction tank, mixing tank etc… Per different shape, there are square shaped tank, V-bottom tank, round bottom tank, and other customized shape tank.

GN Solids control is a professional solids control manufacturer, they can make customized tank per customers special requirement. GN can manufacture mud tank for its own brand fluids processing system but also GN make mud tank with customized design. We are located in China iron production City. The price of raw material here is very low and with high quality. There are also many experienced workforce in iron machine production. They work very efficiently. Moreover, GN control mud tank production cost well by outsourcing some processing work. So buy Mud tank from GN customer will enjoy high quality but Good price. GN are professional in manufacturing solids control system, GN mud tanks design are very compatible for mud circulation system using.

GN Solids Control is the first API certificated solids control manufacturer in China, they have his own heat treatment machine, ball blasting machine and other CNN machine. They are manufacturing per higher standard, see below:

1. Sand Blast Treatment before painting. External paint and internal coating                                                                                              

2. Two pack Epoxy zinc, thickness 75μ               

3. Two Pack Epoxy hi-build containing anticorrosive pigmentstwice,  thickness 250 μ   4. Surface pigmented with high quality light fast  PU pigments, thickness 70 μ

4) Tank face covered with galvanized grating and steel plate

5) Skid mounted or Trailer Mounted 3 runner oilfield skid with V crimp walls

Shale shaker is the first stage solids control equipment. Sealing rubber is used between shale deck and shaker screen. It plays a very important part for shale shaker performance. A better quality sealing rubber can enable a longer life time of shale shaker and can great reduce the quantity of replacement shaker screen.

Functions of shale shaker sealing rubber

1) Shale shaker is a screening device adjust high vibrating strength to separate bigger particals from drilling fluids. Good quality Sealing rubber can reduce the friction of shale shaker deck and the shaker screen, and provented the shaker from damage.

2) What will happen if there isn’t sealing rubber? If there isn’t screen rubber or it is damaged, the screen frame will touch with shaker deck directly, which will be damaged in a very short time.

3) The worse condition is the dirty mud with many junks from well will fall into mud system directly. It needs the higher treating capacity of the next step equipment. Otherwise it may make damage to the next step solids control equipment, or even worse, it may block mud pump and make stop of the drilling rig.

4) If the sealing of the rubber is not good enough, its anti-corrosion not good enough, it will be broken easily under high temperature drilling mud, and the shaker screen will be damaged very quickly.

In some countires, like in China, Kuwait,Oman, U.S. , Canada, Australia, etc…, shale shaker is usually the only solids control equipment in a mud system. Drilling fluids only treated by shale shaker, then back to mud system for drilling again. In this case, it requrests a high standard for the reliability of shale shaker performance.
 Which brand shale shaker can suits such high requirement? See below:

1) Top 1 brand: Derrik FLC 514, Derrick FLC 513 shale shaker

2) Top 2 brand: GN Solids Control shale shaker: GNZS703, GNZS594

image

1500HP land drilling rig usually match 2000bbls mud system. The mud system will have complete full 4 stages solids control equipment and with 5 steps separation process.

image

Equipment included in 1500 hp land drilling rig mud system:

1) First stage solids control – Shale shaker GNZS594E / GNZS703E linear motion, 3 each

2) The second & third stage solids control – Mud cleaner GNZJ594E-3S-16N / GNZJ703E-3S16N, 1 each

3) Vacuum degasser GNZCQ360 to remove gas from drilling mud before enters into mud cleaner desander / desilter cone.

image

4) The fourth stage solids control – Decanter centrifuge, 2 each

 One decanter centrifuge GNLW452S in middle speed for barite recovery.

 Another decanter centrifuge GNLW363 in high speed to separate the low gravity mud.

5) Jet mud mixing & shearing mixing system, with GN high efficiency centrifugal pump and shear pump for chemical shearing and mixing.

6) 7 each Mud tanks: shale shaker tank, decanter centrifuge tank, suction tank, mixing tank, shearing tank, storage tank 1 or 2 each

Above is the standard 2000bbls mud system for 1500 hp land drilling rigs. GN Solids Control can make customized mud system per user’s special requirements. If you need more information of other size land drilling rig mud system, you can visit GN website or send mail to vivi@gnsolidscontrol.com

GN Solids America is the first USA based Solids Control Company from China. Its headquarter located in U.S. Houston, in Oil Center City, Houston, Texas.

The solids control company GN Solids America with its own warehouse very near to Derrick and Kemtron. There are high quality decanter centrifuge, shale shaker and replacement shaker screen stock in Houston warehouse for fast delivery.

If you have interest, please contact GN or visit GN warehouse in Houston for more information of their solids control equipment.