Decanter centrifuge for HDD

Decanter centrifuge is seldom used for plan directional drilling because of the high-cost and separation factor. Only if the fine solids gathered on the mud recycling system and the desilter cone cannot separate them out, then this recycled mud can not be employed for drilling unless the great solids (smaller than 12-15 microns) could be reduced. GN low speed/ middle acceleration decanter centrifuge GNLW452 centrifuge should be used by such circumstance.

GN has shipped several sets of 1000gpm mud recycling system with a couple of units of GNLW452 decanter centrifuges for CPP(China Oil Pipeline Bureau) for their traversing project. Totally 4 value packs of desander mud clean with 2 10inch desander cone and double veranda shale shaker GNZS705, 5 sets of desilter magnetic cleaner with 10pcs 4inch desilter cones with two times deck shale shaker, eight sets of GNLW452 decanter centrifuge with 18inch serving diameter, 1800rpm speed, 7 sets of centrifugal pushes to feed for the desander, desilter, 8 sets regarding feeding pump for the decanter centrifuges. 8 sets connected with 20ft container to install typically the equipments on it and with memory space.
This is not the first order through CPP, they start to purchase mud recycling system regarding HDD since 2010, and also until now they already purchased 30 sets of going mud cleaning system through GN solids control.
Typically the function of the decanter centrifuge in this system is not to different all the fine solids within 15 microns, the purpose should be to reduce the fine solids information in the recycled fluids therefore it can be re-used for the going. So the centrifuge capacity aren't required to equal with the solids control mud cleaner, it is not generally running, we will open it depending on the mud conditions.
Not only to get HDD mud recycling program, the same design could be utilized for tailings treatment of mining, essential oil drilling. Welcome to contact GN solids control for more info.

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Choose GN’s Pump for Different Application

The drilling mud could be seen as the blood of the drilling process, the solids control equipment is used to remove the cuttings to purify the blood. While where is the power of the blood circulation coming from? It is the pump unit that transfers the drilling mud in solids control system from one equipment to another, make the continuously recycling of mud available.

As a leading China based solids control equipment manufacturer, GN solids control could provide the full line of equipment used for drilling mud cleaning. Besides the primary solids control equipment like shale shaker, mud cleaner and centrifuge unit, GN also provides several types of pump for different application in mud recycling system.

Centrifugal pump is the most widely used mud transferring equipment. This type pump uses tungsten carbide mechanical seal, with open design of impeller that lowers the axial thrust load. Centrifugal pump could be used as feeding pump for de-sander and de-silter cyclone unit. For some deep drilling project, the mud system need a trip tank, this type pump can also be used as trip pump. The jet mud mixer unit always equipped with centrifugal pump as mud mixing pump to transfer chemicals into the drilling mud.

Shearing pump is also always equipped with mud hopper. With the impeller material of high wear resistant cast iron, the shearing pump is used to shear the polymers that used in the drilling mud to keep proper mud specific gravity. GN’s shearing pump is available as a belt-driven or diesel-driven package including hopper, mud gun and transfer line orifice plate.

GN’s PD pump is a single screw pump. This pump is an ideal chosen for feeding to decanter centrifuge unit as it transfer the drilling mud without shearing and agitating. This pump, with stator material of elastomeric material, has particular advantages to transfer fluids of high viscosity and hard suspended particles included.

Vertical submersible slurry pump is another choice as feeding pump to centrifuge. This pump is always installed vertically to transfer medium with high concentration particles. Submersible pump is also widely used to transfer the mud from mud pit to the shale shaker in the HDD mud recycling system.

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Dewatering System for Water Hammer

Not only drilling, whenever there is a construction work, or some work, there must be some waste generated, planning before proceed have been more and more important. Some clients who is using water hammer, also is going to do with the waste, and reuse the water.

As we all know there are 4 basic rules of waste handling to make it envronmental friendly. Reduce, reuse, recycle, recover. For water hammer, one of the most important reason is we need to recyle and reuse the clean water.

Reuse – solids control equipment is key to the reuse strategy.  Poor solids control efficiencies will lead to more solids entering the active system, further reducing their particle size, and ultimately resulting in the requirement to dump, or to dilute, thereby increasing volumes and costs, all of which have a negative environmental impact. 

The water hammer which is normally more expensive than the normal drilling rig, especially for the use of the water, not drinking water but need to be as clean as possible.

Therefor now we are deliverying one system to Europe, which is used for water hammer project. Containing:

1) Double deck shale shaker: GN double deck shale shaker can remove the solids in very good performance, top section screen with sieve screens remove most of the big particles. 

2) Decanter centrifuge: GN decanter centrifuge is used to remove the fine solids, min separation points about 2-5microns. Sometimes it need to be used with polymer, the dewatering unit, to make sure we get the better result.

3) Screw pump: screw pump feed for centrifuge. The pump from GN is made by German Netsch, NEMO pump makes sure the performance of centrifuge feeding.

4) Mud tank skid: All equipment is mounted on one mud tank, which is also able to be customized. Normally minimum requirement is to lower the transportation cost. 

Keep tune to GN news, then we can keep you updated on the on site performance.

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GN Own Brand Shaker Screen used on GNZS Series Shale Shaker

GN Solids Control is an API certified manufacture for drilling mud solids control equipment. No doubt, the shale shaker unit is one of the most important equipment in our production line, in the meanwhile, shale shaker is the most important primary solids control equipment that takes place in the role of separating the coarse solids in the drilling mud as the first stage solids control equipment.

The function of shale shaker to separate the solids should give credit to the mesh screen fixing on the shale shaker unit. By using different mesh screen, the shale shake unit could do separation process on different slurry. GN now has 3 main size shale shaker unit, each of them is equipped with GN self designed and manufactured shaker screen. The shale shaker models are GNZS752, GNZS703 and GNZS 594, respectively fixed with 2 panel, 3 panel and 4 panel screens.

From the shale shaker model, we can find some hints of the dimension of the screen. The screen used of the shaker model 752 is 750x900mm. This shale shaker is widely used in some small capacity no dig drilling project and core drilling solids removal unit. Thus, this shaker model is also baby shaker. The shaker 703 is fixed with screen dimension of 700x1250mm; this shaker model is widely used in oil drilling and some big capacity HDD project. Based on the model GNZS703, GN does have the shaker model GNZS706 with 2 layers shaker deck, and 6 pieces screen fixed. And the GNZS705 model is often used as underflow shaker for a mud cleaner unit to further dry the solids discharged from cyclone units. While the shaker model GNZS594 is fixed 4 pcs screen with dimension of 585x1165mm. This model could be used as a primary shaker in solids control system, and it can also be used as high G force drying shaker in waste cuttings drying system. What we need do is to use two high power vibrators. 

Guess through this article, the client would be easily to choose GN’s shaker screen if you already had GN’s shale shaker in hand. Besides, GN can also provide replacement screen for many other brands shale shaker that widely used in the industry. Just let us know once you have the request for the shaker screen.

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What is "IECEX/A-TEX" mark on GN Solids America’s solids control machines?

Oil rig drilling is world-wide operation and solids control machinery and system is manufacture t that it can be operate on any corner of the world, land and sea alike.  As been one of the most hazard working- area condition, the electronic parts of machinery often marked "IECEX/A-TEX".  This is the certificate marked as Hazardous Area Certifications.  The mainstream mark is IECEX which is international which every country accept the standard while ATEX is European standard but most countries are accept the standard as well. 

Explosive atmospheres can be caused by possible burning gases, mists, vapors or by combustible dusts, in combination with oxygen. With a certain concentration density all that is needed to cause an explosion is a source of fire cause by heat and spark.

ATEX or IECEX certified machinery will secure the operators and its machinery assets that under no matter in any working condition it will not cause an ignition so in conclusion it is safe, end of discussion.  The standard divided into different zones that ID potential hazardous atmosphere in the area.

ATEX based on the requirements of two European Directives:

1.  Directive 99/92/EC (also known as ‘ATEX 137’ or the ‘ATEX Workplace Directive’) is minimum requirements for improving the health and safety protection of workers potentially at risk from explosive atmospheres.

2.  Directive 94/9/EC (also known as ‘ATEX 95’ or ‘the ATEX Equipment Directive’) on the approximation of the laws of Members States concerning equipment and protective systems intended for use in potentially explosive atmospheres.

What IECEX Scheme is an international Conformity Assessment Scheme covering Electrical Equipment for Explosive Atmospheres, as the internationally accepted means of demonstrating conformity with IEC Standards prepared by IEC TC31.

ATEX standard is about enabling to trade in European countries. Its purpose is to establish a level of safety which is to be regarded it is sufficient to ensure European authorities would accept the equipment certified.  

Difference compare with ATEX, the IECEX is about giving confidence that a product or service meets clearly defined transparent criteria. By providing its transparency with a high level of confidence, it is intended that it will eventually provide a worldwide recognized and acceptance certificate in which the whole world has confidence. The driving force is safety, with the trade benefits following from the confidence.

GN Solids Control China factory introduced many advanced processing machines from developed countries like European,and USA.And our factory processing team are very experienced. So our production is very effiecient.We can manufacture a whole solids control system needed equipments in a short time. Welcome you contact GN group freely for solution

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Principle And Theory Of Centrifuge Operation

The centrifuge workds with an principle of accelerated settling , centrifuge G force will help solisd settling much quicker . Let’s think about a simple sedimentation vessel to understand it’s working principle , the solids in fluids will settle to bottom of the sedimentation vessel by a period of time later . In a drilling fluids that weight 14 lb/gal and 50 micron barite particle will settle at the same rate as an 81 micron drill solids . All solids can have a detrimental effect on the drilling fluids viscosity . That means a low specific gravity solids will has an equivalent spherical diameter that is 1.6 times that of a barite solids and settle at the same rate as the barite particle . This is the reason that a  centrifuge does not separate varite from low gravity solids .

The convey of solids out of the decanter centrifuge , the conveyor and bowl mus rotate at slightly different speed . This is accomplished using a planetary gear box for belt drive centrifuge and typically the entire assembly rotates in the same direction but the conveyor rotates at a slightly slower speed . The conveyor will move drilling solids to the solids discharge end and the fluids part out of the liquid discharge end .

The centrifuge will provide a method of increasing the settling force on the drilling solids suspended in fluids . The force depends on the mass of the solids and not the chemical composition . Drilling solids with the same mass , maybe barite or low gravity solids  or gold or something , it will settle at the same rate . The decanter centrifuge are able to separatesolisd above and bellow the 2 to 10 micron size range . In the weighted drilling mud , the centrifuge will be capable of eliminating very small particals because of dramatic increase in both low and high shear rate viscosity .

GN Solids America is the first USA based China solids control company. GN’s products are equal in quality and performance as its US and European peers. It is sure to better serve the end users.

GN can offers customized solutions on the drilling waste management  field Welcome you contact GN group freely for solution.

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