Oct 20

Although the major share of GN products are used for oil and gas industry, GN Solids Control also occupies the first place in market share in HDD, CBM and TBM. And among all GN HDD mud recycling systems, the 500 GPM capacity is the most popular among the users.

Picture below is one set of GNMS 500GL HDD System for a jobsite inside China, this is the 3rd project this system is used to serve and GN Solids Control sent engineer to jobsite help to re-set up of the system.

GN HDD System Jobsite

GN HDD System Jobsite

GNMS series mud recycling system is high standard configuration of GN mud recycling systems, they are perfect solution for HDD projects because:

  1. 1. GNZS703E-DZ shale shaker is a mature design of GN Solids Control, it use 3 pcs of shaker screens and the screen area is 2.63 cbm. Same as all the GN Shale Shakers, GNZS703E-DZ shale shaker uses the patented technology for the deck sealing in order to prevent leaking of liquid. Shaker deck frame is Stainless steel to have stronger structure for a longer service life. Unless its peer model GNZS703E-HB which is designed for oil and gas solids control system, this model of shale shaker is suitable for get fed via a submersible slurry pump from a mud pit. It is designed especially for the HDD projects.
  2. GNZS-703E 1S8N mud cleaner is a combination of the 2nd and 3rd separation steps with desander cone and desilter cones, and the shaker below is used as a under shaker for both desander and desilter cones. GN choose polyurethane cyclones as the desander and desilter cones, more wear proof and longer service life than the metal material ones.
  3. As high configuration of GN mud recycling systems, GNMS 500 GL has mixing hopper and mixing pumps for adding new chemicals into the well cleaned drilling mud after recycled. And this 500 GPM system has a larger storage capacity comparing with the standard GNMS 500G system.
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written by shale shaker \\ tags: , , , , , , ,

Jul 07

Besides Oil&Gas drilling, HDD and Piling are both important drilling works, which of course need drilling mud recycling systems. Although all drilling mud systems shares same principals, they have different characters per the different standards of mud.

  1. Finer screens for HDD than Piling

In piling projects, the requirements of fineness of drilling mud are not so high. So the shaker screens used in mud recycling system for piling is not as fine as is used in HDD. Usually grating screens are ok in piling projects, while in HDD, shaker screens are similar with Oil & Gas drilling.

  1. More further treatment for HDD than Piling

In most cases, desander as last treatment for Piling drilling mud is OK. After treated by desander cyclones, the drilling mud can be returned to the system. But for HDD drilling, there is always desilter cyclones adopted.

  1. Larger storage capacity for HDD than Piling

    see GN compact design mud system for piling

    GN compact design of mud system for piling and TBM

  2. Some cases, mixing hopper is necessary in HDD drilling projects

 

GN Solids Control is famous brand for designing and manufacturing closed loop mud recycling system for oil & gas drilling, HDD drilling and Piling. For HDD mud systems, lots of customers all over world use GN Mud recycling system in their drilling package with Ditch Witch or Vermeer drilling machines. Also, as simple configuration, GN Solids Control has very cost-effective GND series mud system for Piling and Micro Tunnel.

 

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written by shale shaker \\ tags: , , , ,

Dec 31

Basical information on solids separation

The drilling mud solids and liquid separation (can be said drilling fluid solids control briefly) technology is a special industry to control the suspending particles in drilling mud. After separating harmful solids out and keep useful solid, the drilling fluid will hold capable property for well drilling

The definition on separation between solid and liquid

The solid and liquid separation means the drilling fluid including liquid and solid. Separate solid out of drilling fluid have following function:

1. Recycling expensive and useful solid. Such as recycling barite but disusing fluid

2. Recycling fluid. Such as recycling drilling mud but disusing drill cutting

3. Recycling liquid and solid but disusing partial solid and liquid at the same time

Drilling fluid solid separation system

Drilling fluid solid separation system

According to most of actual drilling mud separation, we mainly do this separation as recycling a little part of solids but majority of fluid. No matter we choose which drilling fluid process manner, we can’t separate solid out of the drilling fluid totally and make the drilling fluid as pure liquid. Even we must keep some solid in driling fluid, such as bentonite, weighting material, lubrication material, block material, etc.

In common solid-liquid separation equipment, there must be solid in drilling fluid, while some liquid will be brought away by solids 

Drilling fluid separation process

When there is restraint on liquid, while particles will move freely in the fluid under the acceleration condition.  At the same time, we can use sedimentation and buoyance lift manner to separate the solid.

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written by shale shaker

Dec 25

The general information

As we know presently drilling fluids solids control system  is rather important to well drillings. How to configure the equipments and the exact position of each device is the key. If the equipment hold very excellent capacity but without appropriate position will decrease its half effect, while some equipments will be useless.

Drilling fluids system configuration

Drilling fluids system configuration

If the solids control equipment doesn’t have good property or don’t have ideal configuration then the solids in drilling fluid will increase. At this occasion we must use quantities of chemicals to dilute drilling mud, then we have invested much unnecessary cost and it is easy to happen complicated situation in the well bore.

The recycling tank in fluids system

Solids control system should be the equipments combined with recycling tanks. So the recycling tanks is the key parts in solids control system

Drilling fluids tank is used to store, configure, recycle and process the drilling fluid. Its capacity should cater to the largest circulation capacity during the weell drilling as well as the sufficient storage capacity.

Usually we’ll make it as many separated mud containers. Nowadays most manufacturers make the tanks with compartments. If there is no compartment they will make circle pipe to balance  and transfer dirlling fluids between tanks this will leave the fluids at the same level when it is still

Commonly speaking, if we drill a well deep 3200m, the recycling tanks capacity should be not less than 165CBM, and the sotrage tank should be not less than 80CBM, every recycling tank should be 7×2.5x2m=35CBM.

If drill a well deep 4500m, then the recycling tank should be not less than 200CBM, and the sotrage tanks should be not less than 120CBM, and every recycling tank should be 8×2.7×2.1m=45CBM.

For 6000m~8000m well we need drilling fluids tank be not less than 270CBM, and storage tank should be not less than 160CBM. One point, the silting tank should be not too short, at least provide sufficient space for fixing three shale shakers

Drilling fluid solids control equipment

Drilling fluid solids control equipment

The normal incorrect configuration on solids control equipments in drilling fluids

Drilling fluids after processed will be expelled  into upper stream of the suction tank. If the overflow of desander and desilter flow into the tank above the pump sution then the desander and desilter can only process 50% drilling fluids come from the well head but the other half flow make the round of them.

There is also manufacturer make centrifugal pump suction and overflow position in the same tank. This will make the fluids as a small circulation and the fluids system will have nearly0% treating capacity.

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written by shale shaker \\ tags: , ,

Dec 18

The general infor on agitator

Mud agitator can be called mud mixer also.  The mud agitator including motor, gear box, shaft, and impeller. The agitator in drilling mud process system called mud agitator. In other industries there are also agitators, such as in chemical industry, the food service industry, etc. But they are not mud agitator any more maybe the physic agitator, or the jam agitator.

Mud agitator

Mud agitator

Mud agitator specs

Complete mud agitator specs decided by usage industry, the components specs. There are usually following information. The motor, can be explosion proof and common type. As well as the gear box. Then the shaft length, the impeller diameter. Whether there will be stabilizer or not.

Generally we care about more on agitators motors. The main features are, explosion proof type, the speed, the voltage and frequency; if it is explosion proof we also need to know its insulation grade and protection level. Then we need to know the installation type, such as C-Face.

The differential factors

The mud agitator under different working conditions will request related features. Usually, in drilling mud process system there should be one agitator every 3 meters. And other facors are shaft and impellers, etc.

Commonly, the shaft length should be 300-400mm less than mud tank inner height. How about the impeller? This factor is decided by tank width and motor power. Generally speaking, there is a standard configuration on agitators.

Customized Mud Mixer

Customized Mud Mixer

When we use mud agitator holding 10 HP motor the impeller should be 850mm single impeller, or 750mm up one with 650mm down layer one. And when the mud tank inner depth is more than 2m we call the tank is deep one and we need 2 layer impellers. These above factors decide mud agitator models

Other issues on mud agitator

The other issues on mud agitator can decide specific demand. Such as the stabilizer, when the tank inner depth is more than 1.8m it will request shaft stabilizer.  Another issue is the gear box or rotary reducer. This device is an important factor of the agitator impeller speed. 

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written by shale shaker \\ tags: , ,

Dec 07

Vacuum degasser introduction

Vacuum degasser is another kind of drilling mud equipment for degassing. It can be used to separate little gas invaded into the fluid.  ZCQ Vacuum degasser is one equipment  made by GN. This equipment usually set behind shale shaker but before mud cleaner. It also can be used as a big mud agitator during process.

Vacuum degasser is constructed by main vessel, gas water separator, vacuum pump, motor, and eletric control cabinet.

Fluid degasser working principle

Main principle is take advantage of negative pressure make invaded gas out of drilling fluid. Details is as following:

When the fluids flow to  shaker, it maybe mixed with invaded gas.  However, shale shaker can only separate particles larger than 76 microns. It can’t separate gas out. Then in order to keep the property of drilling fluid we need to do degassing.

Drilling Fluid Vacuum Degasser

Drilling Fluid Vacuum Degasser

Firstly we must swith on the main motor to drive the treating vessel. When the main body get good running we need to open the vacuum pump to suction invaded gas out. Then there will be negative voltage.  As we know the drilling fluid has viscosity when the gas invaded it there will be bubbles hard to get rid of. Considering above we design main vessel has a bearing connect with a shaft attached impellers.

When vacuum degasser vessel is negative voltage the fluid will be sucked in it and the impeller will agitate and break all air bubbles. At the same time, the vacuum pump is still working. The gas comes out of bubble break will be sucked by vacuum pump. Then flow to the gas water separator.

The fluid is always with water since its igh temperature and ambient low temperature. Actually we must burn the poisonous gas to make sure the green environment. So the gas with water after go through the gas water separator will make gas more dry. Then we can flare it

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written by shale shaker \\ tags: , ,