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Monthly Archives: June 2014

Adjustable seater type mud gas separator

The adjustable seater type mud gas separator consists of lifting pipe, foxation pipe and baseboard. The quadrangle of the baseboard are all weld fixation pipe, and each pipe has inserted the lifting pipe. The fixation pipe connected with the lifting pipe by fixation hinge pin, the surface of lifting pipe and fixation pipe all equipped multi-align to grid holes.

Mud gas separator

Why produce the adjustable seater mud gas separator

Because of the different drilling rig with the drill floor height, so the matched solid control system height is different, so that make the height of the connection mouth of the mud gas separator and solid control system and the ground is changed. The heigh between the primary mud gas separator and the solid control system mouth and the ground is formulated by the drilling users, if there is difference after delivery the equipment, we can alter the located ground of the mud gas separator.

The adjustale seater mud gas separator is a kind of simple structure, reasonable design, conveniently to use and realize easily adjust the mud gas separator supporter.

liquid gas separator

Adjustable seater mud gas separator adopts the technology scheme to realize as followings:

1 The quadrangle of the baseboard are all weld fixation pipe, and each pipe has inserted the lifting pipe. The fixation pipe connected with the lifting pipe by fixation hinge pin.

2.The surface of lifting pipe and the fixation pipe of the adjustable seater mud gas separator are all equipped the multi-open holes of align to grid.

Compared with the existing technology, adjustable mud gas separator has the advantages of lower cost, simple structure, reasonable design, convenient to use and strong practicability, it efficiency realize the easily adjust mud gas separator height, reduce the labour intensity, reduce the production cost and improve the working efficiency.

CENTRIFUGAL SOLIDS SEPARATION

centrifuge
Before hydrocyclones and centrifuges became available for drilling applications, shale shakers and dilution were the only means of controlling the solids content of drilling fluids. Consequently, solids too fine to be separated by the shaker screens in use could be controlled only by dilution. During drilling with weighted muds, once the solids content reached the maximum acceptable level, the continuing and unavoidable incorporation of drilled solids made it necessary to add a continuous stream of water to control viscosity, while adding barite to control the mud weight. This was, obviously, a costly procedure that generated large quantities of excess drilling fluid.

The centrifuge, in splitting the processed fluid into two streams—the underflow, or ‘‘cake,’’ containing the coarser solids; and the overflow, centrate, or effluent, containing most of the liquid and the finer particles—provides a means of selectively removing the finest, most damaging, solids from the drilling fluid. The removal of these solids in order to control rheology and filter cake quality is the primary reason for centrifuging weighted drilling fluids. When the finest solids are not removed, the only alternative means of reducing their concentration is dilution, always an expensive process.

Centrifuging weighted drilling fluids routes the coarser solids (both barite and low gravity) to the underflow, and the finer solids (bentonite, barite, and low gravity) to the overflow. Separation of the overflow, consisting of the finer solids together with most of the processed liquid and the dilution fluid, reduces the concentration of the viscosity-building solids, alleviates solids problems, and reduces the need for dilution.

This application is often described as barite recovery, a term that does not accurately describe the process, leads to confusion, and is frequently the reason for improper centrifuge use. The validity of the term depends in the preliminary acceptance of the idea that the fluid entering the centrifuge would otherwise be discarded and that the barite is recovered by the centrifuge. Few, if any, drilling people think of centrifugingin these terms. Centrifuges, like shale shakers and hydrocyclones, are solids-removal devices. Centrifuging weighted muds while drilling is correctly thought of as an alternative to dilution for the reduction of viscosity; not as a means of recovering barite from discarded fluid. Another objection to the phrase is that it lends support to the idea that barite recovery is the reason for centrifuging. It is not. The objective of centrifuging in this manner is the removal of colloids and ultra-fine solids to improve drilling-fluid quality. A third objection is that the use of the term tends to create the totally erroneous impression that the process separates barite from low-gravity solids and that the recovered material is all barite. A natural consequence of this belief is that the underflow from barite-recovery centrifuges is sometimes stored and used to weight up freshly prepared drilling fluids. Inasmuch as the recovered slurry often contains high concentrations of drilled solids, it can be severely contaminated, and is rarely suitable for reuse.

HOW A SHALE SHAKER SCREENS FLUID

shale shaker
The primary purpose of a shale shaker is to remove as many drilled solids as possible without removing excessive amounts of drilling fluid. These dual objectives require that cuttings (or drilled solids) convey off the screen while simultaneously most of the drilling fluid is separated and removed from the cuttings. Frequently, the only stated objective of a shale shaker is to remove the maximum quantity of drilled solids.

Stopping a shale shaker is the simplest way to remove the largest quantity of drilled solids. Of course, this will also remove most of the drilling fluid. When disregarding the need to conserve as much drilling fluid as possible, the ultimate objective of reducing drilling costs is defeated. The size of drilled cuttings greatly influences the quantity of drilling fluid that tends to cling to the solids. As an extreme example, consider a golf-ball–size drilled solid coated with drilling fluid. Even with a viscous fluid, the volume of fluid would be very small compared with the volume of the solid. As the solids become smaller, the fluid film volume increases as the solids surface area increases. For silt-size or ultra-fine solids, the volume of liquid coating the solids may even be larger than the solids volume. More drilling fluid is returned to the system when very coarse screens are used than when screens as fine as API 200 are used.
Drilling fluid is a rheologically complex system. At the bottom of the hole, faster drilling is possible if the fluid has a low viscosity. In the annulus, drilled solids are transported better if the fluid has a high viscosity. When the flow stops, a gel structure builds slowly to prevent cuttings or weighting agents from settling. Drilling fluid is usually constructed to perform these functions. This means that the fluid viscosity depends on the history and the shear within the fluid. Typically, the low-shear-rate viscosities of drilling fluids range from 300–400 centipoise (cP) to 1000–1500 cP. As the shear rate (or, usually, the velocity) increases, drilling fluid viscosity decreases. Even with a low-shear-rate viscosity of 1500 cP, the plastic viscosity (or high-shear-rate viscosity) could be as low as 10 cP.

Comparative Operation of Desanders and Desilters

desanders

The role of desanders is to reduce loading downstream on desilters. Installing a desander ahead of the desilter relieves a significant amount of solids loading on the desilter and improves desilter efficiency. High rates of penetration, especially in unconsolidated surface hole, where the largest-diameter bits are used, results in generating larger concentrations of drilled solids. This may place desilters in rope discharge. For this reason, desanders, which have greater volumetric capacity and can make separations of coarser drilled solids, are placed upstream of desilters.

deislter

Desanders remove a higher mass (i.e., coarser drilled solids) during periods of high solids loading. Desilters can then efficiently process the reduced solids-content overflow of the desanders. If the drill rate is slow, generating only a few hundred pounds per hour of drilled solids, the desander may be turned off and the desilter used to process the entire circulating system.
Desilters should be used on all unweighted, water-base mud. These units are not used on weighted muds because they discard an appreciable amount of barite. Most barite particles fall within the silt-size range. Desilter operation is important for all unweighted fluids; however, in oilbase muds with high viscosity (as found in deepwater drilling), the apex discharge may be centrifuged for oil-phase salvage.

Working princile and application areas of decanter centrifuge

When separator operation is no longer feasible due to high proportions of solids in the suspension to be processed, decanters are used. Decanters are horizontal, solids-oriented, solid-wall scroll centrifuges.

In solid-based applications, our centrifugal decanters ensure optimum separation efficiency, particularly in the case of suspensions with a very high proportion of solids. They are also used for the extraction of constituents from liquids and for concentrating, dewatering and classifying solids.

decanter centrifuge

Whenever the clarified liquid is dischaged from the decanter bowl a throttle plate moves along its axis and determines the gap width of the aperture. Intelligent sensor technology recognises the throughput volume necessary at any specific time and regulats the gap width as a function of the liquid level in the decanter bowl by moving the throttle plate to the optomum  position while the machine is running. With varipond, decanters always opertate with optimum efficiency and with much lower operating and maintenance costs. All down stream process are thus optimised too.

centrifuge

The decanter centrifuge application areas include the cleaning of wash water and the treatment of fruit and vegetables in the food industry, the recovery of animal and plant oils and fats, the production of herbal medicines, copper extraction, chemical extraction in the paper industry, the treatment of waste oil for power generation, waste water treatment in waste water treatment plants, and use on oil platforms for the extraction of crude oil.

 

BASIC PRINCIPLES OF AGITATION EQUIPMENT

mud agitators

The purpose of a surface mud system is to allow maintenance of the mud before it is pumped down the hole. This is accomplished by the effective use of solids-control equipment to remove undesirable solids, while simultaneously recovering as much drilling fluid as is feasible. Secondary to the solids-removal process is the addition of chemicals and the rapid and thorough mixing of mud materials. Thorough agitation is necessary to effectively accomplish both of these tasks. In the majority of drilling fluids, agitation equipment must be used to suspend solids in the surface tanks and maintain a homogeneous drilling fluid.

There are two types of equipment to do this:
. mechanical agitators, and
. fluid motive devices, also called mud guns.

mud agitators

Both are widely used, and will be discussed by showing basic principles, installations, and sizing guidelines. Drilling-fluid components such as bentonite (gel), barium sulfate (barite), lost circulation material, polymers, and chlorides (to name a few) must be wetted before they are dispersed throughout the system. Proper introduction of these materials into the drilling fluid is equally important and can enhance drilling efficiency as well as reduce the amount of additives needed. To gain the most advantage, correct addition at the surface will enhance their effectiveness in the well. Several technologies are described to blend, add, hydrate, shear, or mix drillingfluid additives and enhance their effectiveness.

As stated previously, the purpose of agitation equipment is to suspend solids, completely mix mud materials, and maintain a homogeneous mixture throughout the surface system. For all of these requirements to be met, agitation equipment must create an upward velocity within the mud tanks that is greater than the settling velocity (see chapters 8, 11, and 13 for a complete explanation) of the suspended solids. There must be adequate shear and stirring to dissolve, wet, and disperse mud additives. The ability to blend drilling fluid helps maintain consistency. The following discussion illustrates how mechanical agitators and mud guns operate and accomplish these goals.

OEM Mud cleaner for sale

Mud Cleaner is also called Desander and Desilter assembly. It is the second phase or the third phase solids control equipment, Namely, mud cleaner consists of a two-stage separation process using a combination of hydrocyclones frame mounted over a shale shaker to operate as a single unit.

Mud conditioner is effective on processing both weighted and unweighted drilling mud during mud systems in removing and drying solids while retaining the expensive drilling liquid. Used correctly, the drilling mud cleaner would greatly lower both drilling-fluid and disposal costs.

mud cleaner

Now let us discuss how the mud cleaner works;

The feed slurry of solids and liquid is fed through the inlet at a high velocity obtained by steady pressure of twenty-five .The high velcocity transmitted to the feed section creates a spinning veclocityand resurting centrifugal forces.The vortex finder causes the stream to spiral downward towards the hydro cyclone wall,in a downward spiraling stream. The solids seperate according to size and weight particles.In the destiney range of particles in drilling fluids ,size is of far more influence than the variations in density so that basically the biggest particles settle first and fatest.

What features or benefits of DC Mud cleaner:

● Desander & Desilter & Shale Shaker 3 in one unit mud cleaner for compact footprint.
● Removable hydrocyclone assembly from mud cleaner skid for adjust to be a shale shaker.
● Polyurethane Material hydrocyclone for long life backup application.
● Patent tighten rubber sealing for mud cleaner shaker deck and screen for fine screen
● Shaker bottom deck made from Stainless Steel for long service life.
● Patent electric shaker deck angle adjustable while working, mechanical deck angle adjustment for
● Heat treatment on complete shaker deck for High G force operation.
● Famous Brand Vibration Motors : IEC Ex, ATEX and UL Certified mud cleaner
● Pretensioned Shaker screen for fast screen replacement.

DC Solid control is a professional manufacturer of mud Cleaner in China. DC mud cleaner structure is compact, it occupy small space and the function is powerful. If you have need please send inquiry to us.

 

Oilfield Special Mud Cleaner Installation Notes

mud cleaner

Introduction: when installing a mud cleaner, the flow direction of pipelines should be specially noticed. Desand and desilter combined oilfield special mud cleaners produced by Dachuan machinery have the advantages of compact structure and rapid harmful solids removal from drilling fluid, which can improve the performance of drilling fluid and meet the new technique of high pressure jet drilling requirements.

Installation of Mud Cleaners

1. A mud cleaner should be installed on a flat base or installed directly on the ground.
2. When installing a mud cleaner, the direction of water flw and pipeline should be noticed.
3. The layout of mud tank surface should take inside the space for operation. Since the equipment has no moving parts when working, namely, the equipment is maintenance free. But it is needed to keep the entrance load stable, open and close the sewage valve evenly and avoid man-made damage.

mud cleaner

Commissioning and Maintenance of Mud Cleaner

1. Unauthorized disassembly of mud cleaner is not allowed.
2. A mud cleaner is generally installed after a deep well pump.
3. If the system is faced with a long time stop or seasonal stop, before the stop, adding appropriate amount of corrosion inhibitor in the water, and take full moisture protection measures, in order to reduce the corrosion and protect the system.

Desand and desilter combined oilfield special mud cleaners produced by Dachuan machinery includes a desander, a desilter, an underflow shaker, a pressure gauge, bottom groove, a bracket and a base.

The main inlet pipe and liquid outlet tube is arranged with control valve, the base is provided with a chute, the underflow shaker is place on the chute, the hydrocyclones are equiped with automatic anti-block device and underflow adjusting device. Application model has the advantages of compact structure, convenient operation, easy to repair, reliable work, can quickly remove harmful solid from drilling fluid, improving the performance of drilling fluid, meet the new technique of high pressure jet drilling requirements.

Oil Drilling Solids Control and Separation

tank.02

Petroleum solid control system is mainly for oil drilling solids control and separation , enabling the drilling fluid recycling, also called mud purification system . Procedure applies to 2000-7000 meters of drilling wells , oil solid control system consists of 3-7 body composed of modular combinations ; purification jars conical bottom end using the new structure, the edge of the mud mixing system using easy grit ; entire circulatory system between the tank and the tank , between the warehouse and the warehouse that can be separated and can Unicom to meet the needs of drilling operations , including the bottom of the suction manifold valve is open and flexible, reliable sealing after closing . The entire circulatory system configuration 5 purification equipment, ancillary equipment in the shaker, mud cleaner Desanding addition , except for the use of air and vacuum blender , new oil drilling mud purification system , reducing emissions from the mud , with obvious environmental protection.

Solids control system for oil separation process, the drilling fluid debris , silt and other particles , to maintain circulating drilling fluid performance and storage . With increased mixing device , infusion devices and chemical filling device . For improving the physical and chemical properties of the drilling fluid to meet the needs of drilling work.

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