The function of drilling fluid and importance of solids control products

The modern drilling indispensable to use the circulating fluid, in addition to a small amount of circulating fluid is the use of gas and foam, the vast majority ofcirculating fluid drilling are used in liquid, so called circulating fluid used in the process of drilling for drilling fluid. Because the drilling fluid early just mixed liquidclay and water, almost no other chemical composition, oil field used to be called “mud”.

Drilling fluid plays an important role in the process of drilling. Its main function has:

1) cleaning the bottom

Cutting rock resulting in a large number of cuttings in the drilling process, the cutting is by drilling fluid to remove the continuous cycle. If the debris can not be promptly removed, it will be repeated fragmentation, will affect the further drilling rock drill.

2) cooling, lubricating the drill bit and drill string

In the process of drilling, drill bit for drilling pressure load to bear on the very serious, resulting in bit bearing and bit working surface heating. At the same time,because of the drill string friction constantly in the process of rotating with the wall, not only to generate heat, but also accelerates the drill string wear, power consumption is increased, and the drilling fluid can pass through the loop carries heat away in time, cooling of drilling, but also to the lubrication, so as to reduce the side effects produced by friction.

3) the formation of mud cake, protect wall

The formation of deep rock in three-dimensional compressive state due to the top and the surrounding rock pressure. When after drilling, borehole surrounding rock must bear the extruded from all directions and generates a stress incrementvalue, i.e., stress concentration. In this case, if the wellbore rock strength is not big enough, it may lead to the wall collapse. But if the containing increasing agent, filter loss of drilling fluid action low around the borehole wall, will make up the rock stress decreases, so that the ”compression collapse” to reduce the chances. But the density of drilling fluid can not be too large, otherwise it will lead to the rock’s “fractured broken”, causing the leakage of drilling fluid. And by adding various additives in drilling fluid has formed a layer of mud cake on the borehole wall will in the cycle process, mud cake quality can not only protect thewall is not drilling fluid erosion, but also can reduce the leakage of drilling fluidinto formation.

4) control and balance formation pressure

When drilling into the high pressure oil (gas) layer, if the formation of oil (gas)reservoir pressure higher than that of drilling fluid column pressure, will happen “blowout” led to drilling accident. This should be the preparation of drilling fluid density appropriate, make the drilling fluid column pressure is equal to the(usually slightly greater than) the formation pressure, so as to ensure the safeand fast drilling. But the density is not too large, otherwise it may put the oil (gas)layer blocked.

5) floating debris and weighting agent

In the process of drilling, drilling fluid, flow in the annular space of the wellboremay not be too high, and the water because of low density makes the suspensionability is poor, as the debris and weighting agent in drilling fluid circulatingdischarged from the ground, but also to join the other various additives to increase the suspension ability.

6) the geological data to provide the drilled strata

Through drilling fluid sampling on out of the ground of the analysis, can obtain the drill data of lithological and stratigraphic oil gas content.

7) the water power is transmitted to the drill bit

Drilling fluid from the bit nozzle flow to the bottom, not only clean cuttings, but also lower the energy to bottom auxiliary rock breaking, jet drilling is a drilling technique using bit hydraulic power. Proof of drilling practice at home and abroad, jet drilling technology to improve drilling speed, and reduce the drilling cost.

8) removal of drill cuttings on the ground

Solid particles are dispersed in the drilling fluid called solid from drilling fluid.Solid phase in drilling fluid, one is from cuttings, two is to meet the requirement of the drilling technology and adding the man-made

According to the solid phase in drilling fluid action can be divided into two categories:

A class is a useful solids such as bentonite, chemical treatment agent and bariteetc.;

Another kind is the harmful solid, such as cuttings, inferior bentonite, sand etc..The so-called solid drilling fluid control is to remove harmful solid, retain theuseful solids or solid content and total level of granularity in the drilling fluidcontrol scope required in drilling process inside, to meet the requirements ofdrilling fluid properties of drilling process. Usually, the drilling fluid solid control process referred to as solid control, oil field is used to be called mud purification.

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Brief Introduction of Oilfield Drilling Mud Desilter

Oilfield drilling mud desilter

Oilfield drilling desilter is the third stage of oilfield solids control equipment.In oilfield solids control system,the solids with diameter ranging from 12 to 47 μm are to be separated from the rest,which will go through further processing.

Oilfield drilling desilter in mud cleaner

Oilfield drilling desander and oilfield drilling desilter are combined as mud cleaner Drilling mud is fed to the inlet of the desander hydrocyclone and desilter hydrocyclone to separate particles and the underflow passes to the fine screen mesh where in particles larger than barite are discarded and thrown away. In most drilling operation, oilfield mud cleaner is usually located in mud tank.Oilfield drilling mud cleaner is the best choices for small oilfield solids control system for HDD,CBM, water well drilling, mining exploration industry etc.

Drilling Mud Desilter Advantage

1. 100% Polyurethane(PU) material to make desilter cones to extend its service life
2. Clamp type for easy maintenance
3. Compact design small in footprint
4. Flexible options for 8 or 10,12,16 for different capacities
5. Flexible fast connection is available for user to assemble.

Solids control equipment is used in oilfield drilling rig to separate the solids in the drilling fluids that are crushed by the drill bits and carried out of the well surface. Oilfield solid control equipment is consist ofoilfield shale shakervacuum degasser, oilfield desander, oilfield desilter, oilfield drilling decanter centrifuge. Oilfield drilling shale shaker is used to separate the big solids with diameter above 76μm, and 47~76μm for Oilfield drilling desander, and 12~47μm for Oilfield drilling desilter. Vacuum degasser is used to separate the air, if air enters into the drilling fluids.

Any need about drilling mud solids control equipment,pls feel free to contact me.

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The separation size of drilling fluids shale shaker

Drilling fluids shale shaker, the new development of OGEM Solids Control, is an ideal primary solids control equipment for drilling mud circulating system and is characteristic by high performance and easy maintenance.Oil field drilling mud shale shaker mainly consists of explosion-proof vibrating motor, screens, explosion-proof controller, feeder and mechanical lifting system.

Types of Shale Shaker:
1) Linear motion shale shaker. It is the most common shaker model for oil and gas drilling solids control system;
2) Balanced elliptical motion shale shaker. It is not recommended for oil and gas drilling since the flow capacity is big. If the mud flow is not equal, the motion of shaker will be changed. And performance will not be good. Mostly, professional users prefer linear motion for wide application.

Separation Size of Solids Control Equipment – Shale Shaker
The separation size of shale shaker depends on shaker screen size. We call it API size or mesh size. The API defers from API 20 to API 325 per API RP13 standard.
Through changing different API size shaker screen, the shale shaker can separate solids size min. above 40μm (at API 325 shaker screen).
If you do not need to separate so fine solids, you can choose more fine shaker screen, like 800μm.
The common screen API size for shale shaker is API60, API80, API100, API140, API160. Customer can choose the suitable size per drilling mud condition.

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Drilling fluid shale shaker

Common Problems and Possible Cause of Drilling Desilter

Oilfield drilling desilter is the third stage of oilfield solids control equipment.

In oilfield solids control system,the solids with diameter ranging from 12 to 47

μm are to be separated from the rest,which will go through further processing.

The Oilfield drilling desilter is the third stage equipment in the whole drilling mud

system, at the same time, it is an important device, too. Let’s see some common

problems and solutions for that .

Common Problems

(1) Repeated plugging of Apex in all cones.

(2) One or more cones plugging while others are working normally.

(3) Cones are loosing whole mud in stream.

(4) Solids content in cone overflow continues to increase over time.

(5) The underflow discharge is very dry.

(6) Hydrocyclones leak between the cone nut and body, but no fluid is coming out of the bottom.

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Do you know the double shale shaker ?

Shale shaker is the first stage solids control equipment in drilling fluids processing system,also known as key solids control equipment in drilling mud solids control system. The drilling fluids shale shaker can remove cuttings above 75μm brought from the drilling well to leave the liquid with smaller particles into the drilling fluid circulation mud tanks, which will flow into next stage drilling fluids solids control equipment to be treated.

Double shale shakers
Oilfield shale shakers like derrick shaker and brandt shaker are ordinarily consist of skid, vibration isolation fellow member, screen, screen basket, back again tank ( or referred to as mud feeder), vibration engine, and many others. No issue it is linear movement shale shaker, or ellipse shaker. ?The drilling fluids flows straight into the back tank via the flow line right after the mud arrives out of the surface area of the properly. The solids that precipitates in the back again tank would be discharged via the bottom hole, and drilling fluids would flow onto the screen surface area. The solids that are larger than the meshes would be divided and threw out of the shale shaker via other finish of screen. And the fluids with scaled-down component would go via the meshes and key in the mud tank for even more separation.

Shale shaker framework

The screen of shale shaker can be pieces of panels, or a single integrated panel. The angle of the screen can be horizontal, or with a specific angle, or adjustable inside of an angle variety, like -1° ~ +5° or -3° ~ +6°. The screen can be a single layer, or double layers. The engineer should select the correct kind of shale shakers in accordance to the geological and drilling fluids needs. When the drilling fluids amount is big, double or triple shale shakers could be operated, this kind of the purification capability of the linear motion shale shaker would be far better enhanced.

OGEM Solids Control can manufacture types of drilling fluid solids control systems according to the requirements of different drilling conditions. OGEM Solids Control is well-know as a professional manufacturer and decanter centrifuge supplier of oil drilling solids control equipment in China.

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Drilling Fluid Mud Tank Features and Components

Mud tank is petroleum drilling fluid solid control system, it is mainly including FG and ZG

petroleum drilling mud tank, mud tank circulating system according bottom tank shape is

divided into square tank and tapered tank. The tank use flat taper structure or corrugated

structure, the steel plate and structural steel installed and welded. 

Mud Tank Feature

drilling fluid tank is an open-top container, typically made of steel, to store drilling fluid on

drilling rig. They are also called mud tank mud pits, because they used to be nothing

more than pits dug out of the earth. The mud tank is devided into Square tank and Cone-

shaped tank according to the shape of tank bottom. The body of the tank is made of

welding the steel plate and section, using the flat cone-shape structure or the corrugated


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Considerations and Maintenance of Mud Cleaner

Mud cleaner is secondary and tertiary of drilling mud solids control equipment, it is the                                                                               cyclone mud desander and mud desilter cyclone and underflow vibrating screen, three to one. Mud cleaner structure is compact, small footprint area, powerful, is to secondary and tertiary drilling mud solids control equipment the ideal choice for efficient cleaner. Mud cleaner by the sewage pump, cyclone desander, vibrating screen, connect the hose assembly.

The drilling mud cleaner has the higher cleaning function associated with detached demander and desalted. In addition to the sensible design process, it colleagues another shale shaker screen mud cleaner features is compact, it inhabits small space and the function is influential. Mud cleaner is the ideal maneuver of the second class and the third class hard control to treat the boring mud.

Considerations on how to use mud cleaner:
1. The use of the polyurethane cyclone temperature greater than 80 ℃, the lowest not less than 30 ℃.
2. The cyclone feeding solid particles in the biggest be less than 1/10 of the feed mouth narrow edge width, such as more coarse particle should screen out in advance;
3. Often visited sand pump feed, equipment, hydrocyclone grit mouth is abnormal, and so on and so forth.

Maintenance fit how to use mud cleaner:
1, clean the vortex tube after the usage and remove the bottom block sand;
2, cleaning sieve and timely replacement of the damaged screen;
3, the eccentric shaft bearing lubrication and maintenance once a week.

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Versatility and Reliability of Drilling Mud Cleaner

In most drilling operations, a mud cleaner is installed in its drilling fluid tanks. It is usually located in a mud tank in the same location as with the desilters. the application of mud cleaner The application of the mud cleaner is to remove drilled solids larger than barite. Solids smaller than 76 micrometers can be removed by the mud cleaner before the viscosity builds up. 

Mud cleaner can effectively control weighted drilling fluid solid content. Versatility of OGEM Solids Control Mud Cleaner compact, patented, multi-functional drilling fluid mud cleaners are designed to be operated as double-deck drying shaker/mud cleaner or double-deck flow line shaker. It is the 2nd or 3rd solilds control equipment. The built in multi-functional feature allows the operator to handle varying drilling fluid viscosities and solids content with the same unit. In the dual simultaneous flow mode, the top deck handles the hydrocyclone underflow and the bottom deck handles the primary scalping.

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Centrifugal pump in drilling fluid system

In drilling fluid system, centrifugal pumps are always used to transfer drilling fluid for linear motion shale shaker,hydrocyclone desander and desilter or mud cleaners.

Drilling fluid system

Drilling fluid system is the typical 4 phase mud process system,including shale shaker, desander, desilter, centrifuge.The shale shaker is the first stage of solids control equipment in solids control system, which removes cuttings with diameter above 76μm from the drilling fluids brought up from the wells.Drilling mud desander is the second stage of solids control equipment in solids control system. It is mainly used to take away the solids with diameter ranging from 47 to 76 μm from the formerly treated fluids.Desilter is the third stage of solids control equipment in solids control system. Decanter centrifuge is the solids control equipment which used to separate the solids from volumes of liquid that contain solid particles.

Centrifugal pump used as mud pump

OGEM Solids Control SB Series centrifugal pump is used for transporting drilling mud. It can be used as feeding pump for drilling mud desander, drilling mud desilter, or used as mixing pump for Jet Mud Mixer. Also it can be used as trip pump and supercharging pump for rig mud pump.Usually, these pumps are horizontal one. They’ll be mounted on mud tanks ends or under the slant plate of shaker tank. When we set pumps under shaker tank will save much space. However, then it will be inconvenient when we repair or inspect pumps.But sometimes in solids control system there will be vertical pump or submersible slurry pump instead of horizontal pumps.

Drilling fluids flow into the shale shaker directly after it returns to the surface of the well, and the solids that are removed by the screen would be dischanged out of the tank, and the drilling fluids with smaller solids would flow through the screen into mud tank for further purification. A centrifugal pump would sucks the shaker-treated fluids up to the desilter or mud cleaner for further purification. And vertical slurry pump is used to pump the drilling fluids up to the centrifuge,and mud pump would pump the drilling fluids from mud tank into the borehole after it is treated by centrifuge.

Drilling Fluid Mud Cleaner Working Principle and Advantages

As one of the important equipment for solid liquid separation system, the drilling mud cleaner, also called desander and desilter assembly, mainly consists of three parts including desander, desilter and the underflowscreen. It can achieve separation of two stage with the hydrocyclone mounted over the shale shaker. Compared with the independent desander and desilter, the product has much higher working efficiency. Same as the shale shaker in function, the equipment is designed rationally with compact structure, small volume and powerful performance.

Drilling fluids mud cleaner working principle

It is the second or third stage separation equipment of drilling liquid, which will deal with the mud after being treated by the first grade separation equipment. The barite will be recovered and cuttings which are bigger than barite will be removed. Then the barite in the underflow will flow into circulation tanks through the screens when the weighted mud passes while the particles that are bigger than mesh will be removed.

Drilling fluids mud cleaner Advantages

1.Environmentally Efficient The OGEM Solids Control mud cleaner provides efficient removal of sand and silt particles between 12 and 76 microns. Removing and drying drilled solids helps meet environmental regulations by minimizing waste generated and reducing disposal cost.

2.High Performance installed with 1-3 10″ desander cones processing 500gpm respectively and with 8-20 desilter cones which each one can process 80gpm, the ogem mud cleaner can make a separation between 12 and 76 microns.

3.Versatility: OGEM’s compact,multi-functional mud cleaners are designed to be combined with desander, desilter and an Underflow shale shake. The equipment in multi-functional feature allows the operator to handle varying drilling fluid viscosities and solids content with the same unit.

4.Extends Equipment Life, The mud cleaner helps minimize maintenance, repair and replacement of downstream equipment.

5.Reduces Operating Cost, The mud cleaner reduces sand and silt-size particles and saves liquid, thus reducing mud cost, chances of stuck pipe and lost circulation and improving rate of penetration.

6.Reduces Disposal Cost, The mud cleaner minimizes waste generated thus reducing disposal cost.

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