Desander Application Purpose and Some Notes Attention

Desander is the 3rd purification equipment. The popular desander cones are 8~12″. DC desander including 3 types based on bottom shaker configuration. Normally 8in, 10in or 12in diameter.

The application of desanders will depend upon the type of mud in use. A desander: shall be run continuously with unweighted water based mud  to maintain low mud gradient, in top hole sections only may be run sparingly with weighted water based mud shall never be used with oil based mud.

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The purpose of use Desanders are :

1.To maintain sand content of mud below 0.5%.
2.To prevent overloading of desilters.
3. A feed rate of 300 – 400 gpm shall be used.

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Desanders shall be balanced to produce a spray discharge using the procedure outlined above before use.Cones shall be stripped and cleaned after every period of continuous use. For optimum performance, the desander overflow should be routed to the desilter suction tank.

Note please Since, in practice, the cut point of most 12” cones may be of the order of 200 – 220 microns for an unweighted water based mud, utilisation of screens of finer than 80 mesh may negate the need for desanders.

Drilling Fluids play an integral role in oil and gas exploration and production.

Drilling Fluids play an integral role in oil and gas exploration and production. When a new well is drilled, some form of fluid is needed. The base of this drilling fluid, or mud, can be freshwater or saltwater (brine) or it may be an oil- or synthetic-based liquid.

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The type of fluid and the additives used are determined in part based on the composition of the rock being drilled into. Cost and environmental impact are also considerations. The mud may also be modified as drilling progresses and the underground environment changes. The mud serves a number of important functions:

lubricating and cooling the drill bit, thereby extending its life
transporting rock fragments (cuttings) to the surface,
preventing the wellbore from caving in before the casing is inserted, and
preventing the oil or gas from entering the well before it’s completed.
Ideally and increasingly, this fluid is recycled during drilling. To facilitate reuse, cuttings are allowed to settle out in a pit and the resulting liquid is pumped back to the wellbore.

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Water is often a natural byproduct of the drilling and production process. Water may be trapped underground along with the oil and gas. Sometimes this produced water is incorporated and used in the drilling process.

This simple overview illustrates the fact that drilling a new well is a complicated process with many moving parts — literally. A variety of providers are necessary at different times to deliver their unique services until a well is completed.

Multiple functions of DC Double deck Mud cleaner

As is known to all, for Mud Cleaning System treatment, there is single deck shaker and double deck shaker. Considering the fact field application of Mud Cleaning System is combination of cyclones and shale shaker.

In some cases such compact footprint can save location around the mud cleaner and save cash for the operator. We have many design models of double deck mud cleaners it depends upon the treating capacity you necessary as well as your budget.

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Double deck mud cleaner DCQJ may play a role as desander, desilter and double steps of shale shaker. The low deck screen is first separation part of mud cleaner with comparable coarse screens as the upper deck is finer like a drying shale shaker for that desander and desilter cones.

We make use of the dual function double deck shale shaker within the compact style bored piles desander unit, and make a mud cleaner, shale shaker, hydrocyclones, centrifugal pumo, mud hopper in a single skid. It may be utilized for HDD, bored piles desander unit, water well drilling, trenchless,and so on projects.

If you have interesting of DC Mud cleaner, please contact us.

Matching using the mud gas separator and vacuum degasser in mud system

In oilfield mud system, there are two equipment used for removing the harmful gas from drilling fluids. They are mud gas separator and vacuum degasser.

Vacuum degassers utilize negative pressure to withdraw entrained gases from the mud. In order for this to work, mud is pumped through a venturi, which develops a negative pressure, thus sucking mud into the unit. The mud then flows over dispersion plates, arranged either horizontally or vertically, creating thin sheets of gas-cut mud. These dispersion plates bring entrained gases closer to the surface for easy removal by a stand-alone vacuum pump. The choice between horizontally or vertically mounted units is typically based on the footprint requirements of the specific rig.

vacuum degasser

Degassers are used to remove the small entrained gas bubbles left in the mud by the mud/gas separator. These units are positioned downstream from mud/gas separators, gumbo removal equipment (if utilized), shale shakers and mud conditioners (if utilized), while hydrocyclones and centrifuges follow in the arrangement.

Mud/gas separators and degassers mechanically remove entrained gases such as hydrogen sulfide, carbon dioxide and natural gas from the mud system. Entrained gas can reduce the hydrostatic head of the mud column and can cause catastrophic well control problems. BRANDT manufactures both mud/gas separators and degassers.

mud gas separator

Mud/gas separators are the first units of solids control equipment arranged to treat mud. As such, they process all of the mud from the flowline before the mud reaches the primary shale shakers. The units have no moving parts and rely on the density difference between the gas and the mud for removal. The process is simple, yet very effective.

Type of drilling fluid and the additives used in oilfield

Fluids play an integral role in oil and gas exploration and production. When a new well is drilled, some form of fluid is needed. The base of this drilling fluid, or mud, can be freshwater or saltwater (brine) or it may be an oil- or synthetic-based liquid.

The type of fluid and the additives used are determined in part based on the composition of the rock being drilled into.

drilling fluid

Cost and environmental impact are also considerations. The mud may also be modified as drilling progresses and the underground environment changes.

Ideally and increasingly, this fluid is recycled during drilling. To facilitate reuse, cuttings are allowed to settle out in a pit and the resulting liquid is pumped back to the wellbore.

Water is often a natural byproduct of the drilling and production process. Water may be trapped underground along with the oil and gas. Sometimes this produced water is incorporated and used in the drilling process.

Production stage of shale shaker in DC Workshop

Shale shaker is a common used product for water well drilling, HDD, Oil&gas drilling, CBM and ect. We have many types of shale shakers, such as linear motion, elliptical motion, dual motion accoridng to the movement locus.

Recent days, DC Machinery manufacturing a linear motion shale shaker for a India clients who are focus on Horizontal directional drilling. So far, we finished the shaker box production.

shaker

The model of the shale shaker is DCS630-3, which has 3 panel shaker screens whose dimension is 630x1250mm. Inlet flow is 120m3/h. The models is the hot sale unit in HDD industry.

shale shaker

All of DC shale shakers adopt Italy OLI brand motors which have the advantages of high strength vibration, large screening area, adjustable screen box angle, little noise and high efficiency. Heat treatment of the complete shaker deck.Surface painting with heavy anticorrosion to extend the service life of shale shaker.

If you have interesting with it, please contact us.

Feeding pump- screw pump for decanter centrifuge in drilling mud process stage

Screw pump is an ideal pump for drilling mud feeding to decanter centrifuge without shearing or agitating the drilling mud. Compared to centrifugal pumps, screw pumps can move drilling mud axially without turbulence. They are also able to pump fluids of higher viscosity without losing flow rate. Also, changes in the pressure difference have little impact on screw pumps compared to centrifugal pumps.

screw pump

The main parts are screw shaft (rotor) and screw shaft bushing (stator). Because of the special geometry shape of the two parts, they form pressurize capacity separately. The fluids flow along with the shaft, inner flow speed is slow, capacity remains, pressure is steady, so it will not generate vortex and agitating. The shaft of the pump is made from Stainless steel, DC Screw pump is available for option with complete stainless steel body. It can drive by coupler, or adjust the speed by using variable speed motor, Triangle V-belt, gear box, etc.

DC is a professional oilfield drilling fluid screw pump supplier and manufacturer in China oil drilling mud solids control and drilling waste management industry.As the pioneer in this industry.

DC is capable of providing customers with series products ,such as oil & gas drilling fluid solids control equipment, decanter centrifuge, drilling waste management equipment and drilling security equipment.

Desander group manufactured for piling project

To retrieve the bentonite used in construction for engineering foundations (like diaphragm wall, piles, etc..) and some underground works, Desanders provide with a reliable and compact design which allow reuse bentonite mud after use and contaminated with sand and silt. The laws of each country requires a maximum percentage of sand in the sludge before starting concreting.

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There are basically two types of Desanders: simple and double cyloning:

Desander of simple cycloning: land recommended for sandy or sandy little bit thin. Sludge only happen once the cyclone after passing through a phase of screening in order to remove larger material.

Desander of double cycloning: need for sand or fine sand with many. Similar to single cycloning, with the difference that the sludge pass twice through the cyclone so as to separate the finest sand and silt even.

Main Applications:

1- By fully purifying slurry, it is favorable to control slurry index, reduce drill stucking phenomena, and improve drilling quality.
2- By thoroughly separating the slag and soil, it is favorable to enhance drilling efficiency.
3- By realizing the repetition use of slurry, it can save slurry making materials and thus reduce the construction cost.
4- By adopting the technique of closecycle purification and low water content of removed slag, it is favorable to reduce environmental pollution.

DC solid control has the 60 m³/h, 240 m³/h size avaiable for your foundation bored pile bentonite recycling.

DCS630-3 shale shaker used for water well drilling

DC Machinery Manufacturing designs and manufactures portable mud management (shale shaking) machines for water well drilling companies. Shale shakers are often simply called “shakers.”

The model of DCS630-3 shale shaker is a professional unit for water well drilling whose treating capacity is about 120m3/h and with linear motion movement locus.

shale shaker

3 Panel Linear motion DCS630 shale shakers meet the needs of solids separation in a large number of different industries. To name a few, Drilling, (whether it be used in Oil and Gas as a primary or drying shaker, Water Well, or HDD), Dredging, Mining and Dewatering for waste disposal.

For water well drilling, the 3 phase solids control normally is enough, but for oil drilling especially the deep well drilling, after mud cleaner, the solids control system will fit with one middle speed decanter centrifuge for barite recovery and High gravity solids separation, and one high speed decanter centrifuge for fine and ultra fine solids (Low Gravity solids) separation.

Functional and work flow of drilling fluid mud cleaner

Drilling fluids mud cleaner is the second or third stage drilling fluids solids control equipment in drilling fluids recycling system. This oil drilling fluids cleaner will handle the solids particle after being treated by the first grade separation equipment.
Following is the introduction of the drilling fluid mud cleaner.

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Work Process of Mud cleaner:

The weighted mud flows to the inlet head section of the desander and/or desilter entering the hydrocyclones for separation of particles. Mud leaving the underflow is further screened with fine mesh to separate larger particles allowing only barite-size particles to pass through the screen.

Features of Drilling Mud Cleaner:

High wear resistance: The cyclone uses special polyurethane with high wear resistance.
Uniform Pressure: Circular tower separation and feeding pipe with heavy caliber make cyclones have uniform pressure.
High Separation Efficiency: Tangent feeding and streamline design improve separation efficiency.
Multi-Purpose: The shale shaker for this item can be treated as level A shale shaker through tube shunt.
Easy to Handle: With digital control panel, you can use it and handle it as easy as possible.
Easy to Connect with Other Equipment: Mud cleaner could be easy to connect with other related solid control equipment to work
together

You are welcome to call Dachuan Machinery to get more infos about the mud cleaner and we are appreciated to supply the cost-effective products and service for you.