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Tag Archives: solids control equipment

Cut Points Solids Control Equipments Separated

solids control equipment

Cut points are used to indicate the separation characteristics of solids control equipment at a given moment in time. The performance of the equipment, in addition to the condition of the drilling fluid, should be taken into consideration in the assessment of cut point data. Cut point curves are derived from the collected data and indicate, at the actual moment of data collection, the percentage of chance that a particle of a particular size can flow through or be discarded by the solids-control equipment. Therefore, the cut point curve is a function of the physical properties of the solids (i.e., density), particle size distribution of the solids, physical condition of the solids-control equipment (i.e., sealing capabilities), and the drilling-fluid properties.

Cut points may be determined for all drilled-solids removal equipment. The mass flow rate of various-size particles discarded from the equipment is compared with the mass flow rate of the same-size particles presented to the equipment. When testing a particular unit, knowledge of the feed flow rate to the unit and the two discharge flow rates are required. The density of the feed flow multiplied by the volume flow rate provides the mass flow rate into the unit. Discharge mass flow rates are also calculated by multiplying the density of the stream by the volume flow rate. Obviously, the sum of the discharge mass flow rates must be equal to the feed mass flow rate. Usually one of the discharge flow streams is discarded and the other is retained in the drilling fluid. The material balance—both the volume flow rate balance and the mass flow rate balance—should be verified before measuring the particle sizes of the various streams.

Solids-removal equipment removes only a very small fraction of the total flow into the equipment. For example, a 4-inch desilter processing about 50 gpm of drilling fluid will discard only about 1 gpm of material.Since the discarded material is such a small proportion of the total material processed, the difference between the retained stream and the feed stream is difficult to measure. For this reason, more accurate data are acquired by mathematically adding the value of the discarded solid concentrations to that of the retained solids concentration to determine the feed solids concentration.

To determine the mass flow of a particular-size particle in the feed (or retained) stream and the mass flow of the same-size particle in the discard, flow rate measurements and solids concentrations are needed.The discard volume flow rates are normally relatively low, but the feed rates require using a flow meter or a positive displacement pump.

Drilling Mud Agitators Manufacturer

The drilling mud agitator is mainly used for mixing the drilling fluid to keep the uniformity of the mud and the suspension state of the solid particles. It can agitate the drilling fluid consecutively and reliably with both axial and radial flows to ensure the active mud system flowing evenly without participation of the silt, sand and other solid matters.

DC Machinery produces the product of four kinds with the motor power of 5.5kW, 7.5kW, 11kW and 15kW respectively. The product with the power less than 5.5kW adopts cycloid speed reducer. The product with the power greater than 7.5kW uses turbo and worm gear speed reducer. It has the features of large transmission torque, steady operation and working reliably.

Mud agitator

The drilling mud agitator adopts explosion proof C-face electric motor which is approved by ATEX and IEC Ex. If customers have the needs, it can be furnished with marine motor. Different from the centrifugal pump and drilling mud gun, the product is designed with relatively low shearing capacity and low energy consumption. By using single reduction worm gear to achieve drive, it has high transmission efficiency, strong agitating power and high durability.

Furthermore, the equipment has fewer moving parts and can be maintained easily with inexpensive cost. The impeller of the product is completely made from casting to ensure excellent mixing performance. With the advantages of compact structure, small volume, low operational noise and slight vibration, our product is the ideal solids control equipment.


Oilfield Vacuum Degasser

Vacuum DegasserAs the second class purification equipment for oilfield drilling fluid,Vacuum degasser actually is used to remove little invaded gas in drilling mud. It will be set between shale shaker and mud cleaner/desander.

The vacuum degasser could be used in many field, like commercial uses, agricultural uses, oilfield uses. Hereunder we talk about the oilfield uses.In oilfield drilling fluid system, there are 2 types degasser. One is poor boy degasser separates large quantity invaded gas, the other is the vacuum degasser, we also call it gas buster.

An efficient degasser is essential to safe and productive drilling operations. Since gas is practically insoluble in water, it is relatively easy to detect and remove. By comparison, gas is readily soluble in oilbase muds – its detection is more difficult as well as its removal. Regardless of the composition of the gas encountered, gas present mud can decrease efficiencies in rig pumps, centrifugal pumps and associated operational equipment. The goal is to “Keep the pumps Operating”.



Shale Shaker Manufacturer in China

A drilling fluid shale shaker is a vibrator used for solid/liquid separation. It is an important device in solids control system because efficient operation of other surface solids separation equipment is critically dependent on proper functioning of the shaker.

Shale Shakers

The purpose of using a shaker is to recover drilling fluid and remove large solids as most as possible. A well designed shale shaker will not only maximize use of the screen cloth to separate solids from liquid, but will also convey these solids off the screen quickly, minimizing fluid loss with the solids and clearing the screen for more feed.

The shale shaker, in various forms, has played prominent role in oilfield solids control schemes for several decades. Shakers have evolved from small, relatively simple devices capable of running only the coarsest screens to the models of today. Modern, high-performance shakers of today are able to use 10 mesh and finer screens at the flow-line in most applications.

With rapid development of drilling new technology, the demand for drilling fluid solids control is getting higher and higher. The research for solids control equipments especially for the shale shaker is paid closer attention by world drilling engineers.

Shale ShakerShale Shaker.

DC Machinery is a professional manufacturer of solids control equipments. Shale shakers designed and manufactured by DC Machinery include three types: Linear Motion Shale Shaker, Balanced Elliptical Motion Shale Shake, and Circular Motion Shale Shaker.


The significance of reasonable solids control system matching

Statistical analysis results show that in drilling process about 90% of daily maintenance cost of drilling fluid is in solids control or to related issues. Weighting drilling fluid, the cost of barite accounts for about 75% of the total material cost of drilling fluid. Therefore, select and use solids control system and equipment correctly has the vital significance.Solids Control Equipment

Reasonable matching of Solids Control System means various models, various specifications of the solids control equipment applied in the process of solids control system reasonably. This process can meet the requirements of drilling technology to drilling fluid purification, and can obtain the best economic benefits. The rational matching of solids control equipment not only requires each device should have reliability and advanced nature, but also requires the whole system to have comprehensiveness, rationality, advanced nature and good adaptability.

Due to different drilling region and strata, the distribution of solid phase particles in drilling fluid also have differences, therefore, according to the distribution of the solid phase particles in drilling fluid and different requirement of drilling operation to the performance of drilling fluid, adopt different types of purification equipment and process, make each device can play the best performance, and control the solid content of drilling fluid in a reasonable scope, this is the real meaning of rational matching of solids control equipment.

How to enhance the service life of Shaker Screen

Drilling fluid shale shaker can eliminate the solid particles size depend on the mesh size and shape. Field data shows that use the shaker screen with 12 mesh number most can eliminate only 10% of the solid phase. Therefore, we should use 80~120 mesh fine screen to eliminate more drilling cuttings.

However, it will occur the following new problems: The mesh area of fine screen is less than the conventional screen, thus will reduce the treating capacity; The thin wire strength is low, the service life is shorter than the conventional screen; When high viscosity drilling fluid through the fine screen, the mesh will be blocked easily.
Shaker Screen.

The main reasons of shale shaker screen broken quickly are many aspects: Screen quality is not qualified, screen tension strength is not enough, vibration motor steering error, clay accumulation and so on, these will cause shale shaker screen broken quickly.

For increasing the service life and anti-clogging ability of shaker screen, we often use the laminated screen which has two or three layers screen, the lower coarse screen plays the support role. In addition, we can also use the double or multiple screen which has a certain space distance between layer and layer. Generally the upper is coarse screen, and the lower is fine screen. The upper coarse screen can eliminate bigger solid particles, can reduce the burden of the fine screen to remove fine solid phase more effectively.

For enhance the service life of screen which has no tension, it must ensure every parts (like rubber strut member, nut, bolt, spring, etc.) can be installed suitably, no deformation. According the installing step which supplied by manufacturer to install the screen. If the multilayer shale shaker only use one layer, it must ensure the tension pole is safe and reliable.


Solids control system for well drilling

Commonly used solids control methods are Dilution, Interchange, Sedimentation and Mechanical removal.

Mechanical removal has the following features:

1 Equipment matching, eliminate step-by-step.

2 Stable mud performance, less mud loss and low pollution.

3 Low cost.

Solids control system is a way of Mechanical removal, mainly includes three parts: drilling fluid circulating tank, drilling mud cleaning equipment, electronic control device.

Solids control system is according to the principle of screening and centrifuge to process drilling fluid with different density and particle size. According to the need to trade-off, and get the drilling fluid with the best performance.Solids control system.

With the development of well drilling technology, drilling fluid solids control system plays an important role in drilling operation, various kinds of solids control systems emerged at the right moment, no matter how to change the type of solids control system, it’s basic function will not changed. It is depend on organic combination of mechanical removal equipments, drilling fluid storage tanks and other auxiliary equipments to accomplish the basic function.


Application of desander and desilter

The cut point of 10 in or 12 in desander is 40 ~ 45 um and that of 4 in and 5 in desilters 20 ~ 25um. Since desanders and desilters would discard large amount of barite along with the drilled solids in a weighted mud, therefore they are usually used only with unweighted mud.2 in desilters can be optionally used for removing even finer particles (7 ~ 10um) of the underflow of the upstream desilters or mud cleaner.

Number of hydrocyclones: the number of desanders arranged in a set for a rig is determined in the way that the capacity processed by the defined number of hydrocyclones of a set of desanders must be equal to 125 % of the maximum rig circulating rate or more. A number of hydrocyclones in a set of desilters must process 150 % of the rig maximum circulating rate.

Factors influencing hydrocyclone performance:

(1) Mud density.

(2) Solid content of the underflow of the preceding equipment or solid content of the mud that gets into the inlet of this unit.

(3) Mud viscosity.

(4) Feed pressure.

(5) Feed flow rate.

(6) Apex size.


Capacity and efficiency of shale shaker

As the first-level solid control equipments in the drilling fluid process, the shale shakers first clean up the larger solid particles in the drilling fluid which returned from shaft bottom, it is fit for the screening of various kinds drilling fluid. Shale shaker is the necessary equipment in the well drilling equipments at present. 

The skill level of shale shaker mainly reflects on handling ability (thruput and separation size ),working stability, the length of  service life and operating flexibility.

The volume of fluid processed per unit of time by a shale shaker depends on the following factors:

1 Type of screen motion. The type of motion of shaker screen will influence the ultimate position of the vibrating assembly relative to the deck of the shaker and the motion track of cuttings. It can be: circular, circular-elliptical or linear.

2 Vibrating amplitude of the screen.

3 Vibrating frequency of the screen.

4 G-force: This is the force imparted by the vibrating system of the shaker to the screen surface to vibrate for solids separation. For conventional shakers G-force = 3 and for strong shakers G-force = 4~6.

5 Mesh and weaving type of screen cloth.

6 Drilling fluid properties such as density, PV, YP and gel strengths.

7 Load of solid on the screen (increases with the increase of pump output and mud solid content).


Arrangement of Solids Control Equipment

The following pictures show the recommended arrangements of the solids control equipment for unweighted and weighted mud systems. In general, the various pieces of equipment are arranged in decreasing order of their cut points as the mud proceeds downstream from the flowline.

Any dilution water used should be introduced ahead of the solids- removal devices in order to improve their separation efficiency. Additions of all other mud materials should be made downstream from the last solids-removal device.

The feed and discharge of each device should be separated so that newly processed mud is not fed back to the device. Preferably, the feed and discharge should be in alternate pits. The discharge end of the overflow pipe from a desilter or desander should be above the mud level. If it is not, the separation efficiency will be reduced and mud can siphon back through the cones and out the underflow when the pump is shut down.


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