Category Archives: solids control

History and future of solid contrpl system

Drilling fluid maintenance cost, clean up & disposal cost as well as the over all cost of boring, can be reduced dramatically when proper solids control techniques are
utilized.

The shale shakers were derived from technology used in the mining industry. The shale shaker remains today the primary piece of solids control equipment utilized in the industry.

SONY DSC

SONY DSC

The future path of solids control systems will continue to increase the overall removal efficiency of undesirable solids from the drilling mud. This will include continued improvements in shale shakers and screen life. Research investigating alternate technology such as using vacuum techniques and different motions may prove more effective in the future.

The continuing trend of more stringent environmental regulations around the world will require more and more solids control systems to be implemented to minimize haul off of drilling waste not to mention the cost saving on equipment such as mud pumps and mud motors.

The solid control system is in the debugging phase before leave factory

DC Machinery is a well known brand manufacturer of solid control system. This month, we finished the production of a set of solid control system. All of our product will having a debugging before shipped to users.

SONY DSC

SONY DSC

Solids control system is a combination of complete line solids control equipment. Including shale shaker, cleaner, centrifuge, tank, and so on. A standard shaker or fine screening machine is vital to whole system and should process 100% of the mud returning from the starting pit before allowing this mud to be processed by any of the downstream equipment you may utilize in your system.

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SONY DSC

Different solids control system device will achieve different cut point. When we design equipment should consider the hydraulic or capacity we should consider minimum level. Ensuring that the individual components meet the standard.

Good solids control in well drilling will produce good quality drilling fluids during whole well drilling. The good drilling fluids will affect well drilling much. Use good drilling fluids, the well drilling will be fast and efficient, the drilling cost will be less than those bad solids control well drilling.

Adverse effects of excessive solid content in slurry

The existence of excessive useless solid phase in mud is the biggest hidden trouble to destroy the performance of drilling fluid, reduce drilling speed and lead to complex situations in all kinds of wells. People in the long-term practice and continuous research, summed it up that the high content of useless solid phase in drilling fluid will bring the following several points of adverse effect for drilling works.

1.The influence of solid phase to drilling speed

When the mud solid content is high, the ability to carry the drilling cuttings is weakened, a large number of large particles can not be discharged out of the well hole, causing the bit to broken bits repeatly, and thus increasing the wear of drilling tool, thereby affecting the drilling speed.

2. The influence of solid phase to mud cake quality

During the drilling process, the amount of water loss and solid particle content will directly affect the quality of mud cake formed in the hole wall. A small amount of fluid loss, mud cake is thin and tough and will do good protection for the well wall,  which is our goal. High solid content, water loss of slurry increases, resulting in shale formation water hydration swelling and hole wall instability, and induce the hole accident.

drilling solid control

3.The influence of solid phase to circulation system

The higher the solid phase content is, the more the mechanical wear of the circulatory system will be. Too much solid phase in the mud will accelerate the wear of mud pump cylinder and piston, thereby increasing the maintenance time and lead to the decrease of the drilling efficiency. Drilling efficiency will be significantly reduced due to the increase of the auxiliary operation.

4.The increase of waste pulp displacement, causing environmental pollution

In the process of drilling, the performance of the drilling can be changed due to the cuttings entering into the drilling mud continuously. Most of the mud is belong to alkaline solution, random emissions will not only destroy the vegetation, but also cause the alkalization of soil, and influence the vegetation regeneration. In addition, there are some additives in the drilling mud so that the color of mud will change into black, a large number of emissions will cause visual pollution to environment.

Method summary for solid control in drilling fluid

There are four kinds of solid phase control methods of drilling fluid, which is the dilution of water, the replacement of the drilling fluid, pool sedimentation and mechanical equipment to remove the solid phase. The use of chemical flocculation can significantly improve the effect of pool sedimentation and removal of solid phase with mechanical equipment. However, the flocculant itself can not play the role of separating the solid phase, it must be used with mechanical sand removal equipment together can it receive the expected results

One: Water dilution

Dilution of the drilling fluid with water is one of the most basic methods of solid phase control. When the water was added into the drilling fluid system, the volume of the system increased, but the total amount of the solid phase was not changed, so the volume content of the solid phase was decreased in the system relatively. At the same time of adding water, it also need to add a considerable amount of processing agent in order to keep the original drilling fluid loss. Therefore, water dilution method not only to increase the drilling fluid storage equipment, but also consume a lot of water and processing agent, so that the cost of drilling fluid is increased. And it is also easy to make the performance of the drilling fluid fluctuate, resulting in complex underground conditions.

solid-control-system

Two: Replace part of drilling fluid

With clear water or solid content of the drilling fluid to replace a certain volume of high solid content of the drilling fluid, so as to achieve the purpose of reducing the solid phase content. Substitution method can reduce the amount of water and treatment agent, but after all, it will waste a lot of drilling fluid and consume a lot of treatment, it is not a good way to remove the solid too.

Three: Big pool precipitation

This method is widely used in the field. Solid phase and liquid phase have the density difference, after a certain period of time, the debris will be separated from the mud under the gravity action. Settling efficiency increase with the reduce of drilling fluid density, viscosity and the increase of the particle size. But when the viscosity of drilling fluid is larger (larger than 20 seconds), especially with shear, the falling velocity of particle was significantly slower.

Four: Mechanical equipment to remove solid phase

Commonly used machinery equipment are three types of shale shaker, cyclone treatment machine and centrifuge, distinguished by the size of the particle separation, hydrocyclone can be divided into three kinds of desander, desilter and super cyclone. Their use range is:

Mud vibrating screen: more than 74 microns

Desander: 25-40 microns

Desilter: 10-25 micron

Centrifuge: less than 10 microns

Compared to the dilution method, the method of cleaning the solid phase has the advantage that it will not increase the  volume of the drilling fluid notablely when removing the solid phase. The cost of drilling fluid was significantly decreased without the addition of a large number of processing agents.

What is a solid control shear pump

The shear pump is a new type of centrifugal pump, which is based on the existing centrifugal pump theory, it is the equipment designed for rapid configuration and processing of the drilling fluid in the supporting system of solid control equipment.

The main purpose of the shear pump is  to shear polymer clay (drilling fluid medicine), in the preparation of drilling fluid, it can efffectively mix, fully dydrate the added materials in the drilling fluid, save the use of drilling fluid materials and shorten the preparation of drilling fluid to provide a goog drilling fluid performance.


shear pump


 

Shear pumps transport the drilling fluid containing abrasive fine particles, the working condition is very bad, when the shaft seal of shear pump leak, it will not only lead to low efficiency and waste of the drilling fluid, but also cause serious environmental pollution. Therefore, efficient and reliable sealing quality is the key to ensure the continuity and safety of the shear pump.

Shear pumps developed by DC Machinery Co., Ltd . have perfect shear and hydration system, which can quickly cut and dilute hydrated polymer.

(1) Unique mechanical composite seal technology, ensuring no leakage.

(2)High wear-resistant metallic material impellers and casing will prolong service life.

(3) Impeller structure which accords with the principle of fluid mechanics will increase liquidity.

(4) Efficient and low shear force will reduce costs.

If you have some needs or questions of this product, please contact us!

 

 

 

What is the complete solids control system?

Drilling fluid solids control system is usually not only refers to a number of solid control equipment , but also includes the drilling fluid returns from the well to the drilling pump suction flow throughout the ground , this process has a full mechanical sand removal equipment, gas removal equipment, mud agitator or drilling fluid gun,mud tank,drilling fluid configuring equipment and so on. entire system is the key equipment in a variety of solids control equipment, namely shale shaker, desander desilter , mud cleaner , centrifugal, vacuum degasser ,the other part of ancillary equipment.

Typically, each of solids control equipment in a certain range of particle sizes can play a role , but in the entire drilling process , the amount of processing any kind of equipment is not overloaded , can play out its greatest advantages. In addition to the centrifuge process only part of the drilling fluid displacement , other equipment handling capacity of at least 100% of the amount of drilling fluid circulation to 125% . Solids control equipment in top working condition depends on the overall drilling fluid system , whether or not distributed dispersed drilling fluids , disordered coagulation or an orderly condensate , water-based or oil-based , water or salt , potassium salt polymer or general clay drilling fluids, drilling fluids heavier or heavier , they require the removal of the solid phase of the basic principles are the same, that is, control particle size range and volume percentage clear . Rational design of effective drilling fluid solids control system , the ultimate goal is to get rid of drill cuttings , so that to achieve the best economic benefits of drilling – drilling rate is high, less sticking , cementing excellent and low cost .

offshore closed solids control system

To accommodate offshore drilling requirements, and special areas, easy to transport and install. Have appeared in a closed fluid solid control system. It consists of shale shaker, hydrocyclone, mud cleaner, decanting centrifuge, mud agitator, and various tank combination, the implementation of closed loop fluid handling. In cold areas, deserts dryland operation, the whole apparatus required large metal box closed, such a system adaptable, in many cases can almost handle various drilling, the drilling fluid to maximize the solid phase control equipment, process efficiency, operations do not add drilling fluid, but also to maintain the fluid density, processing capacity and equipped with drilling rig adapt, can enter the system in the drill cuttings removal, almost no supplemental water drilling fluid, this system is the most suitable for dry areas or offshore drilling operations, and does not pollute the environment.want to know more, pls contact Ms Cathleen , mail: dc@dcmudcleaningequipment.com

What is zero discharge solids control equipment?

Via 20-year grueling efforts from 1990s to 21st century, DaCuan has developed oil drilling solids control system and waste management equipment and has set up an integrated waste management solution system by combination of domestic and foreign treatment experience learnt on the site.

This solution would deal with disposal at the source by means of solids control equipment, dewatering purification equipment and waste management equipment.

The first part—solids control equipment, comprising shale shaker, vacuum degasser, desander, desilter, decanter centrifuge, is directly connected to mud pumps. The drilling mud drawn out from well would go through the four phases of solids control system. Afterwards, it would be used again and the disposal is minimized at the same time.

The next part after solids control is dewatering and water treatment, via which water may be effectively recycled. If they are applied in water-scarce area, large amount of water would be saved and waste disposal reduced.

Then, screw pump or screw conveyor may transport dewatered waste to Hi-G Dryer and Vertical Centrifuge, waiting to have solids and liquid separated again. Hi-G Dryer’s high spinning speed and effective treatment would produce very dry dregs, recover partial drilling fluids and recycle resources.

In the end, the dregs would be further treated by means of solidification, cutting injection, biodegradation, thermal desorption according to the actual situation on the site of drilling and the composition of dregs.

Drilling waste disposal would be reduced to almost zero after go through the system, effectively satisfying the demands for zero discharge and the state environmental protection regulations, solving the vexing problems in oil drilling, and truly fulfilling the wish of “green drilling” in oil industry.

Tangshan DaChuan Machinery Co.,Ltd.

Contact: Cathleen li

Mail:  dc@dcmudcleaningequipment.com

 

DC solids control equipment introduction (2)

The two types of centrifugal separation devices are:

Decanting centrifuge , Hydrocyclones

Decanting centrifuge

A decanting centrifuge consists of a conical, horizontal steel bowl that rotates at high speed using a doublescrew-type conveyor. The conveyor rotates in the samedirection as the outer bowl but at a slightly slower speed. An important aspect of centrifuge operation is the dilution of the slurry being fed into theunit. The slurry dilution reduces the feed viscosity and maintains the separation efficiency of the machine. The higher the viscosity of the base mud, the more dilutions needed.The effluent(liquid output from the centrifuge) viscosity should be 35 to 37 seconds per quart for efficient separation. If the viscosity falls bellow 35 seconds per quart, too much water is being added. This will cause turbulence within the bowl and reduce efficiency. Manufacturers’ recommendations concerning mud-feed rates and bowl speed should be follow closely .

A single centrifuge unit set for total solids discharge should be used for low-density systems. The primary function of a centrifuge is not to control total percent solids in a system, but rather to maintain acceptable and desirable flow properties in that system. The centrifuges operating in series are recommended for the following systems:

1. i.e., synthetic and oil-base systems

2. High-density, water systems

3. Water-base systems in which base fluid is expensive

4. Closed loop

5. Zero- discharge

The first centrifuge unit is used to separate barite and return it to mud system. The second unit processes the liquid overflow from the first unit, discarding all solids and returning the liquid portion to the mud system. Note: Centrifuge efficiencies are influenced by mud weight and mud viscosity. During centrifuge, the underflow should be analyzed regularly to determine the amount of low-gravity solids and barite being removed and retained.

Hydrocyclones

Hydrocyclones, classified as desanders or desilters, are conical solids separation devices in which hydraulic energy is converted to centrifugal force. Mud is fed by a centrifugal pump through the feed inlet tangentially into the feed chamber. The centrifugal forces thus developed multiply the settling velocity of the heavier-phase material, forcing it toward the wall of the cone. The lighter particles move inward and upward in a spiral ingvortex to the overlow opening at the top. The dischargeat the top is the overflow or effluent; the discharge at the bottom is the underflow. The underflow should be in a fine spray with a slight suction at its center. A ropedischarge with no air suction is undesirable.

The size of the cones and pump pressure determine the cut obtained,Lower pressure result in coarser separation and reduced capacity.

Desanders

Desanders consist of a battery of 6-inch or larger cones.Even though desanders can process large volumes of mud per single cone, the minimum size particles that can be removed are in the range of 40 microns (with 4-inch cones)

Desilters

Desilters consist of a battery of 4-inch or smaller cones. Depending on the size of the cone, a particle size cut between 6 and 40 microns can be obtained.Even though hydrocyclones are effective in removing solids from a drilling fluid, their use is not recommended for fluids that contain significant amounts of weighting materials or muds that have expensive fluid phases. When hydrocyclones are used with these fluids, not only will undesirable drilled solids be removed, but also the weight material along with base fluid, which can be cost prohibitive.

Mud cleaner

The mud cleaner is a solids separation device that combines a desilter with a screen device. The mud cleaner removes solids using a two-stage process. First, the drilling fluid is processed by the desilter. Second, the discharge from the desilter is processed by a high-energy, fine-mesh screen shaker. This method of solids removal is recommeded for muds containing significant amounts of weighting materials or having expensive fluid phases.

If you have any interests, pls contact DaChuan Machinery for more information, our mail are : dc@dcmudcleaningequipment.com

DC solids control equipment introduction (1)

DaChuan solids control equipment is pofessional manufacturer of solids control equipment manufacturer. With quality equipment and most competitive price . We produce mud equipment including HDD & CBM, mud recycling system, waste management equipment. In the following I will give you some introduction about solids control.

Overview

Solids control is the process of controlling the build up of undersirable solids in a mud system. The build up of solids has undesirable effects on drilling fluid performance and the drilling process.Rheological and filtration properties can become difficult to control when the concentration of drilled solids ( low gravity solids ) becomes on a drilling operation rates and bit life decrease and hole problems increase with a high concentration of drill solids.

Solids control equipment on a drilling operation should be operated like a processing plant. In an ideal situation, all drill solids are removed from a drilling fluid. Under typical drilling conditions, low-gravity solids should be maintained bellow 6 percent by volume. Sources and sizes of solids The two primary sources of solids (particles) are chemical sdditives and formation cuttings. Formation cuttings are contaminants that degrade the performance of the drilling fluid.If the cuttings are not, they will be ground into smaller and smaller particles that become more difficult to remove from the drilling fluid. Most formation solids can be removed by mechanical means at the surface. Small particles are more difficult to remove and have a greater effect on drilling fluid properties than large particles. The particle size of drilled solids incorporated into drilling fluid can range from 1 to 250 microns.

Mechanical solids removal equipment One method of solids control is the use of mechanical solids removal equipment.Another method, dilution, is discuss later. Equipment that removes solids mechanically can be grouped into the two major classifications: 1. Screen devices 2. Centrifugal separation device.

Screen devices

The most common screen device is shale shaker, which contains one or more vibrating screens that mud passes through as it circulates out of the hole.

Circular/ elliptical motion shaker.This shaker uses elliptical rollers to generate a circular rocking motion to provide better solids removal through these screens.

Linear motion shaker. This shaker uses a straight forward-and-back rocking motion to keep the fluid circulating through the screens.