Drilling fluid is used to aid the drilling of boreholes into the earth. Often used while drilling oil and natural gas wells and on exploration drilling rigs, drilling fluids are also used for much simpler boreholes, such as water wells. Liquid drilling fluid is often called drilling mud.
In drilling operations, solid weighting materials are commonly added to the drilling fluid to give sufficient density to the fluid to hinder inflow of oil or gas into the wellbore from the down-hole formation. Weighting material sag. i.e. sedimentation of weighting material from the drilling fluid, has been and is currently one of the biggest challenges within the drilling fluids industry as it can lead to well control problems, lost circulation, hindered running of casing/liner, insufficient displacement etc.
weighting material adding equipment
CALCIUM CARBONATE is Acid souble weight material.It is used to prevent fluid invasion of permeable zones, and to prevent loss of circulation during drilling, workover, and completion activities. CALCIUM CARBONATE is applicable in all drilling fluids, aqueous and non-aqueous. It can be used to prepare a pill for spotting purposes. is also used as an acid soluble weighting material for drill-in or workover fluids with a density of 14.0 ppg or less.
HEMATITE is for extremely high density mud.It is used to obtain mud weights in excess of 20.0 ppg in water based drilling fluids, 19.0 ppg in oil based drilling fluids, or any time that exceptional control is required of solids percentage for rheology control.
Barite is the most used weighting material, has a density of 4.1. It is used for increasing the density of fresh water, salt water, and oil based muds.
Barite is added through a hopper, GN designed Jet mud mixer is used for barite adding, it consist of venturi hopper and mixing pump. It can be used with the complete mud system, also it can be used separately.
Jet shearing unit is consist of venturi hopper and shearing pump, which can cut the big section into small pieces and add weighting material then mix them. It is commonly used in oil & gas drilling solids control system, usually it is installed on the weighting tank or mixing tank. Sometimes it is used together with decanter centrifuge.
GN designed centrifuge mud tank for oilfield and dredging project, with 1 unit of GNLW553VFD decanter centrifuge(or other model available) and Nemo pump to feed the centrifuge, the centrifuge tank is divided into 2 compartment, the mud after treated by shale shaker, desander/desilter flow or be pumped to compartment 1, then Nemo pumppumped it from the compartment 1 to the centrifuge for processing, the clean drilling mud dropped into compartment 2, which can be pumped to other application or flow to anywhere required.
centrifuge mud tank
In oilfield application, sometimes mud hopper unit also installed on centrifuge mud tank, the mud which will be feed to centrifuge is with solids smaller than 20 microns, it has been separated by desilter cone. After treated by decanter centrifuge, the max solids remained in the drilling fluids is smaller than 5 microns, it is called “clean mud”. The clean mud may be weighted in pill tank/compartment and mixed by mud mixing hopper & mixing pump.
In Dredging project, centrifuge mud tank is applied after dredging slurry separation system, after treated by the desander ( or sometimes desilter), the solids remained in the slurry may be too fine to be separated out by the centrifuge, so you need a flocculation tank before centrifuge mud tank. After flocculation, the mud is concentrate so It is easy for centrifuge to separate it, this is for better performance. So you have to use a positive displacement pump to pump the flocculated mud to centrifuge, otherwise the centrifugal pump will break it off. Sometimes filter press will replace the centrifuge, but efficiency of filter press is not so dissatisfied, so people use large treating capacity centrifuge instead.
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Last week we exported a mud mixing plant to Spain. Every year we design and manufactured hundreds of mud mixing plant for international clients, especially for developed countries, like UK, Australia, USA, New Zealand, Singapore, etc.
mud mixing plant to Spain
The mud mixing plant is with mud hopper, slurry pump, mud agitator, mud tank, control system, and the painting color can be customized. The mud tank dimension is designed by the active capacity clients required. And we should consider the container shipment when design, freight charge is one of the factor clients may care.
Except for skid-mounted mud mixing plant, we can also make it portable mud mixing plant, and connected with truck head for convenient transportation.
During shipment, we put mud hopper inside the tank by remove the Galvanized Steel Grating, and put the hand rail, stairs on top of the tank.
Except for mud mixing plant, we can also produce mud recycling system plant, including shaker tank, suction tank, reserve tank, water tank, trip tank, pill tank and related solids control equipment. We can also add dewatering unit if clients required.
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A good mud mixing and additive system should be a jet-shear mud mixing system, it must has three functions, shearing, jet mixing and drilling fluids additive. GN design and produce such multiple function system.
GN mud mixing and additive system
GN mud mixing and additive system can be mounted on a separate skid then connected with a mud mixing tank, or they can be mounted on the skid of the tank. The latter way is a compact structure of mud mixing unit, and the former way can be more flexible to move the mud mixing unit from one place to another. But you do not have to move it all the time, the mud mixing pipelines which is controlled by butterfly valves can reach this target, too.
with a mixing pump is the most simple way for the mud mixing unit. Centrifugal pump can be replaced by shearing pump, then you call it jet-shear mud mixing system.
What is drilling mud additives?
Drilling fluid additives are specialty products that serve a specific need – and Halliburton and Baroid are known for high-quality additives that deliver the consistent performance mandated by environmental regulations. Our commitment to research and development ensures that our products and processes reflect the latest advancements in fluid additive technology.
Jet shear mud mixing systems are designed to use shear pump to efficiently mix solids with liquids. Jet shear systems ensure efficient and mixing of soluble polymers and bentonite used in water-based drilling fluids, therefore eliminating “fish eyes”. Drilling fluid yield and gel strength properties are instantly obtained with hydraulic shearing of bentonite or organophilic clays.
The addition of liquid additives is made easy with the incorporation of an injection port into the jet pump. This port is capable of handling liquid additives such as; lubricants, polyacrylamides, and oil-wetting emulsifiers. By incorporating an in-line mixer, the operator is given the choice of imparting low shear into the drilling mud. When the appropriate level of mixing is imparted into the drilling mud, polymers are efficiently used, therefore lowering additive costs.
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GN mud mixing hopper are widely used in HDD(horizontal directional drilling) and oil gas drilling for bentonite mixing.Mud Mixing unit is combination of drilling mud hopper and centrifugal pumps,it’s mixing force comes from the centrifugal pump.
mud mixing hopper
The mud mixing hopper, also called a jet mixing hopper, in which materials are put into the circulating mud system. The mud hopper is powered by a centrifugal pump that flows the mud at high velocity through a venturi nozzle (jet) below the conical-shaped hopper. Dry materials are added through the mud hopper to provide dispersion, rapid hydration and uniform mixing. Liquids are sometimes fed into the mud by a hose placed in the hopper.
Mud Mixing Hoppers
The GN Mud equipmet range of mud mixing hoppers delivers safe, accurate and reliable mud mixing for both on- and off-shore applications. Design of the hopper is focused on key safety and usability features such as dust-free operations, interfacing abilities and remote or manual control options.
The mud mixing unit can be delivered with an integrated Venturi-type mud mixer to provide fast, easier and more effective mixing of fluids and powders. We can also design and manufacture upgrades of existing mud mixing hopper systems to ensure dust-free operations and more modern interfacing abilities. Feeding and dosing is controlled using Open / Close valves; the valves can be controlled remotely (optional) or locally.
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