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Monthly Archives: November 2013

High speed decanter centrifuge

CentrifugeThe early 1950s, the foreign began to use high speed spiral sedimentation centrifuge in the oil drilling. It is installed behind hydrocyclone for separating fine particles which can’t separated by hydrocyclone.

The low speed centrifuge mainly used for recycling barite and other weighted solid phase particles from drilling fluid, so that control drilling fluid density, the economic benefit for using the method of dilute drilling fluid to control drilling fluid density is very obvious.

Moreover compared with middle or low speed centrifuge, the thruput of high speed centrifuge is less about five times, and can deal with the solid particles which relatively fine, it is a problem to separate drilling fluid which contains higher solid phase density, so the high speed centrifuge and the low speed centrifuge must be used together.

The solid phase dispose scope of high speed centrifuge is just the solid phase scope which affect drilling fluid viscosity (1~10um), so for the deep well reducing drilling fluid shear, enhancing well bore quality, preventing accident, the effect of high speed centrifuge is better. Experimental results show, high or low speed centrifuge apply to drilling fluid solid control, not only control drilling fluid density and solid content increase, but also reduce drilling fluid density and viscosity when needed.


The Use of Shale Shakers

Shale shakerDrilling fluid shale shaker can eliminate the solid particles size depend on the mesh size and shape. Field data shows that use the shaker screen with 12 mesh number most can eliminate only 10% of the solid phase. Therefore, we should use 80~120 mesh fine screen to eliminate more drilling cuttings. However, it will occur the following new problems: The mesh area of fine screen is less than the conventional screen, thus will reduce the treating capacity; The thin wire strength is low, the service life is shorter than the conventional screen; When high viscosity drilling fluid through the fine screen, the mesh will be blocked easily.

For increasing the service life and anti-clogging ability of shaker screen, we often use the laminated screen which has two or three layers screen, the lower coarse screen plays the support role. In addition, we can also use the double or multiple screen which has a certain space distance between layer and layer. Generally the upper is coarse screen, and the lower is fine screen. The upper coarse screen can eliminate bigger solid particles, can reduce the burden of the fine screen to remove fine solid phase more effectively.

When choosing shale shaker, except for according to the solid phase particle size distribution to choose suitable screen, still should consider another important factor: Screen permissive treating capacity. The treating capacity of shale shaker should be adapted to the maximum delivery capacity in drilling process.


Oilfield Vacuum Degasser

Vacuum DegasserAs the second class purification equipment for oilfield drilling fluid,Vacuum degasser actually is used to remove little invaded gas in drilling mud. It will be set between shale shaker and mud cleaner/desander.

The vacuum degasser could be used in many field, like commercial uses, agricultural uses, oilfield uses. Hereunder we talk about the oilfield uses.In oilfield drilling fluid system, there are 2 types degasser. One is poor boy degasser separates large quantity invaded gas, the other is the vacuum degasser, we also call it gas buster.

An efficient degasser is essential to safe and productive drilling operations. Since gas is practically insoluble in water, it is relatively easy to detect and remove. By comparison, gas is readily soluble in oilbase muds – its detection is more difficult as well as its removal. Regardless of the composition of the gas encountered, gas present mud can decrease efficiencies in rig pumps, centrifugal pumps and associated operational equipment. The goal is to “Keep the pumps Operating”.



Shale Shakers in Solids Control System

Shale ShakerThe first line of defense for a properly designed solids control system is the shaker. Shale Shakers remove solids from drilling fluid as the mud passes over the surface of a vibrating screen. Particles smaller than the openings in the screen pass through the holes of the screen along with the liquid phase of the mud.

Particles too large to pass through the screen are thereby separated from the mud for disposal. Without proper screening of the drilling fluid during this initial removal step, downstream equipment will experience reduced efficiency and effectiveness. The downstream hydrocyclones and/or centrifuges (if employed) will simply be overloaded beyond their design capacity.

There are a number of commercial claims that indicate that shakers can achieve solid cuts lower than 74 microns, however, when it comes to the practical installation and use of solids control systems (i.e. relative to flow rates, drilling fluid viscosity, screen condition, volume of solids being managed, etc.) operators should conservatively assume 100 microns as the performance limit.

Horizontal Directional Drilling Solids Control System

Relative to the use of drilling fluids within the oil and gas industry, the use of drilling fluids within the horizontal directional drilling (HDD) industry is new. Even today, the amount of research and development aimed at HDD drilling fluids is considered a rounding error in the oligopoly of drilling fluid manufacturers. However, the trends strongly suggest that the future of HDD drilling will follow a similar evolution as experienced by the traditional oil and gas industry.

Solids control system

Couple the evolution of drilling fluids with the escalating cost of waste management and disposal, the economic practicality of utilizing drilling fluids, is fully dependent on the ability to recover and recycle. Though the cost of barite and bentonite continue to be commoditized, additives continue to become more and more expensive. Add the escalating cost of qualified personnel, HDD rig operators are left with a critical challenge: making profits, when the cost of business is increasing.

A typical HDD solids control system will employ a combination of shaker, hydrocyclone, mixing, pump and compartmentalized tank technologies. The shaker is vital to the solids control system and is considered the first line of defense. Located directly downstream from the shaker will likely be a hydrocyclone assembly that will employ desilters, desanders or both. Though still considered rare, centrifuge-enable solids control systems are becoming more popular. By adding a centrifuge, the solids control system will achieve the highest level of cut available within the market today.


Oilfield Desander for Drilling Mud

DesanderAs an auxiliary device in the petroleum drilling, the drilling fluid desander is mainly used for eliminating the rock debris and sand carried by the drilling fluid from the stratum in the process of drilling operation.

Desanders are installed on top of the mud tank following the shale shaker and the degasser, but before the desilter. Desander removes the abrasive solids from the drilling fluids which cannot be removed by shakers. Normally the solids diameter for desander to be separated would be 44~74μm, and 15~44μm for desilter.

HydrocycloneAs one of the indispensable and important device for stabilizing and regulating those technical indicators of the drilling fluid, the drilling mud desander has also been extensively used in the tertiary purification of the drilling fluid. As the combination of the hydrocyclone desander and the shale shaker screen, the drilling mud desander is the three-level solids control equipment used in the solids control system of the drilling fluid. It is primarily made up of the vibrating screen, the distribution manifold as well as the hydrocyclones.


Drilling Jet Mud Mixer

Jet mud mixerDrilling jet mud mixer is the device integrated with venturi hopper and mechanical seal jet mixing pump which are connected with manifold valve. Featuring simple structure and high practicability, it can work reliably and be moved conveniently.

The device is mainly used for preparing and weighting drilling fluid through changing the density, viscosity and the condition of dehydration of the drilling fluid. If working with mud shear pump, it can show much greater performance. The device can also be designed to be a double jet mixing device to meet the needs of drilling.

Jet mud mixerThe drilling mud mixer can help operators to get the ideal drilling fluid with good properties by adding bentonite, polymer and other powder additives. As to the application of weighting the mud, the ability of mud mixer to handle barite plays an even more important role. Meanwhile, the jet mixing pump and the hopper can be installed flexibly on a single skid, or on the skid at tank end or separately with the hopper on tank top and the pump at tank side. The flexible design can make the whole mud system compact and user friendly.

State blocks permits for 2 Grays Harbor oil terminals

A state regulatory board is withdrawing its approval of permits for two crude oil shipping terminals in Grays Harbor, saying backers have failed to address public safety and environmental issues.

The Quinault Indian Nation and several conservation groups successfully argued that permits issued for two terminals in Grays Harbor should be reversed.

“Those permits should have never been issued in the first place,” said Fawn Sharp, president of the Quinalt Nation.

“The shipping terminals would be a clear violation of public safety, as well as treaty-protected rights. Far more jobs would be lost when the inevitable spills occur than would be gained from the development of the proposed oil terminals,” Sharp said.

There are three terminals on the table for Grays Harbor. Two are officially in the permitting process, which is now on hold.

The Imperium terminal would draw two additional trains per day and 200 ships or barges per year. It would have storage capacity for more than 30 million gallons of oil.

The Westway terminal would draw two unit trains every three days and 64 barge movements. It would have storage capacity for more than 33 million gallons of oil.

Overall, the proposed projects could lead to 520 additional vessel transits per year in Grays Harbor, and 973 unit trains per year to the Port of Grays Harbor.

The Washington Shorelines Hearings Board said the permits were issued without appropriate review of the vessel and rail transit increases and identified “troubling questions of the adequacy of the analysis done regarding the potential for individual and cumulative impacts from oil spills, seismic events, greenhouse gas emissions, and impacts to cultural resources.”

There are now 11 places in the Northwest considering taking oil arriving by rail from North Dakota to be transported onto ships. Meanwhile, there’s talk in Congress about weakening rules against exporting American oil.


VSM Multi-Sizer separator Shaker

The reliable, operator friendly VSM Multi-Sizer separator provides high performance and flexibility for modern-day drilling practices. The VSM Multi-Sizer separator is the first to introduce CONSTANT-G CONTROL to provide optimum performance to meet drilling rates and separation efficiency.


CONSTANT-G CONTROL (CGC) is a patented technology developed to maintain an optimal G-force rating on the VSM Multi-Sizer separator during varying liquid/solids loading conditions. CGC Technology maximizes screen performance, solids conveyance and throughput while enhancing screen life. CGC is an industry first and a standard feature on the VSM Multi-Sizer.

With the addition of an accelerometer on the basket tied to the VFD operating the drive motors, the VFD is able to constantly monitor the Multi-Sizer separator’s G-force and adjust the motor speed in order to maintain the G-force at predetermined set points, depending on fluid and solids loading on the basket. The Multi-Sizer separator will run at a lower G-force and reduces wear on screens and components, while operating with little solids loading. When loading becomes more extreme and higher G’s are needed to process all of the drilling fluid, the Multi-Sizer separator will automatically ramp up to a higher G-force.

The VSM Multi-Sizer separator also offers a flexible flow (Flex-Flow) system that provides the ability to run in two unique operating modes: “in-series” and “in-parallel.” Changing modes is easily accomplished with an adjustable flow diverter.


Drilling Mud Recycling System Manufacturer in China

Drilling mud recycling system is mainly used for oil and gas drilling fluid circulation, horizontal directional drilling (HDD) fluid recycling, underground drilling mud recycling, geothermal drilling, dredged-fluid or slurry separation, mining, coal exploration drilling, water well drilling and more.

Drilling Mud System

Drilling Mud System

As an experienced drilling mud processing system manufacturer, DC Machinery can provide the products matching with different drilling rigs and horizontal directional drilling rigs according to customers’ requirements and working environment. Meanwhile, DC Machinery offer a series of related services including regular maintenance, system reconstruction, system installation and other aspects.

Drilling Mud System Drilling Mud System2

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