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Monthly Archives: August 2012

Linear Motion Shale Shaker used in Mud Cleaning

The linear motion shale shaker is the first level solids control equipment in drilling mud system, it is also the core equipment for the mud cleaning system.

The linear motion shale shaker uses two motors vibrate in-phase for separation. The electric vibrator and the electric equipment in the electric control system are imported explosion proof appliances. The linear motion shale shaker is constituted by five parts: foundation, screen case, mud case, dip angle regulation equipment, electrical control system. It is designed with the global most mature and popularly applied dual-shaft synchronized inertia straight-line vibration theory.

The china professional manufacturer of mud cleaning equipments DC Machinery can give you reliable products and save your cost to give you more benefits. The following is the technical parameters of linear motion shale shaker

 

TYPE DCS585-3/4 DCS630-3 DCS700-3/4 DCS830-2/3
Shake Locus linear type
Motor Power 2×1.5/1.72KW 2×1.5KW 2×1.5/1.72KW 2×1.3/1.72KW
Shake Strength ≤7.0G
Amplitude 5~6mm
Thruput Per Screen 100/130 m3/h 440/572GPM 120 m3/h 528GPM 110/130 m3/h 440/572GPM 80/130 m3/h 352/528GPM
Angle Of Screen -1°~5°
Motor frequency and voltage 380V/50HZ(Foreign custom motor according to customer requirements)
Screen Area 2/2.73 m2 2.36m2 2.2/2.94m2 1.8/2.7m2
Screen Specification 585×1165mm (40~250) 630×1250mm (40~250) 700×1050mm (40~250) 830×1080mm (40~250)
Remarks The proportion of thruput per screen in the total amount is:1.2g/cm3,the viscosity is:45s

Drilling fluids degasser manufacturer-DC Vacuum Degasser

The degasser is used to clean up the gas in the drilling fluid, ensuring the performance of drilling fluid relatively stable and the proper functioning of swirler. The degasser can be separated into two types: constant pressure degasser and vacuum degasser. The constant pressure degasser inhales the mud by using centrifuge, to make the mud jet in the jet tank, and hit the wall by the virtue of centrifugal force, and then the gas will be released.

The vacuum degasser uses the suction function of the vacuum pump to form the negative pressure in the vacuum tank. Under the pressure of atmosphere, the drilling fluid enters into hollow shaft from suction line, and then to be gathered by the umbrella slices around of the hollow shaft to toss to tank skin in spurting. With the impact of vacuum and bubble centrifuge, the bubble will be broken in the drilling fluid, the gas will escape and suction out by the vacuum pump and vent to the safety zone.

We manufacture Vacuum degasser for separating gas in the drilling fluids and drilling mud. DC Vacuum Degasser is one of the most important Equipments for Solid Control.

ZCQ series Vacuum Degasser is a special-purpose device and a new type one for the treatment of gas in the drilling fluids. It can get rid of various gas of invasive drilling quickly. Vacuum degasser is very important for returning mud gravity, stabilizing mud viscosity and reducing drilling cost. Also, at the same time vacuum degasser can be used as a heavy-power agitator and supported applicable to all types of mud circulation purification system. The vacuum degasser design of the structure is scientific and rational. So we are able to achieve an effective gas-liquid separation, filter out impurities and to ensure that the exhaust pipe is always smooth.

China manufacturer DC Machinery offer the world with mud/gas separators & vacuum degasser.Our company is  an exporter of mud/gas separators, vacuum degasser for Indian, Russian,middle east.etc. Our factory and company are Quality Management System ISO 9001-2000 .Buy  mud/gas separators,vacuum degasser from China manufacturer, high quality,best price..Your best vacuum degasser for drilling  mud cleaning system. If you want to know more, please come to our Company Blog.

How to Maintain the Sand Pump

Application

Sand pump is widely used in the supply and transportation of mud in the drilling fluid system, like the desander and desilter, centrifuge, and can be used as the priming pump and replenishment pump, and also to be used in chemical industry, oil refining, traversing, coal mining, and construction, etc.

The following is the maintain of the sand pump

The sand pump should use the lower revolving speed for reducing the wear between pump impeller and pump case.

In the same pipeline, it is not allowed to open two sand pumps at the same time, and it is not allowed to make air or other gas into the inlet pipeline of sand pump.

The entrance of sand pump should be installed with the filter by regulation, and clean frequently.

It is not allowed to use the method of turn down the suction valve for adjusting the flow or pressure of the pump, otherwise, this will cause the cavitation damage of the pump.

If you want to reduce the flow of one solid control equipment, don’t open the valve, in this way, it will waste electric power and make the motor overload, at this time can only close some swirlers

When the pipeline is no-load, the pump started, the valve of outlet pipe should be closed. Special attention should be paid, it is only has 1~2min for working at off state, otherwise, the liquid in the pump will be boiling soon.  Then open the valve gradually, after the pump smooth running, the start work is over.

Depend on the requirement of manufacturer specification, the bearing of pump should be injected with lubricating oil or grease. For example, the engine oil should be replaced 3~5 times each year.

Don’t limit the flow of pump suction side. If the pump suction pipe don’t supply enough, it will lead to cavitation, and cause the damage of pump.

When start the electric motor sand pump, the valve of outlet pipe which installed between the pump and the equipments should be opened a little. Once the pump achieve the normal speed, open the valve completely and gradually. Do like this will reduce the start load of motor and the vibration of other equipments like pressure gage and swirler. The method of start alternately is the valve closed completely before the start, and opened gradually after start, this will prevent overheating and avoid destroying the tightness of the pump.

DCSB sand pump is special for the drilling fluid, impeller is designed with teh passageway. The wide passageway and smooth streamline blade increase the open area to ensure a unhindered mud flow, make the sand pump more effective and energy-efficient. Pump case is with the efficient runner type line, to decrease the turbulent flow. All the parts were made by wear-resisting casting iron, oppose the attrition and corrosion. Compared with the general pumps, the DCSB sand pump is with the marked characteristic of good performance, huge mud flow, thermostability, long-life time, easy maintenance, high effective, energy conservation.

The Advantage of Drilling Mud Cleaner

Compared with the traditional desander and desilter, mud cleaner is the upgrade product. It belongs the second or third level solid control equipment in the drilling fluid solid control systems, it is the complex of hydrocyclone desander, hydrocyclone desilter and the shale shaker. The structure of mud cleaner include desander, desilter, pressure pump, swirler, bottom flow slot, drilling fluid shale shaker, support and base. the characteristic is there is a control butterfly valve between the main inlet tube and drainpipe of desander and desilter, on the base there is a chute, the shale shaker is located on the chute. In the swirler, there are automatic sand blocking prevention equipment and bottom flow port regulation equipment.

Compared with the single desander and desilter, DCQJ series mud cleaner has the advantage of large thruput, fast processing speed, compact structure, easy to operate and easy to maintain. DCQJ series mud cleaner synthesize the advantages of shale shaker and swirler, it can eliminate the harmful solid phase quickly, and improve the performance of drilling fluid, and satisfy the demand about the high pressure jet drilling new technology.

DCQJ series mud cleaner also can be customized. Only top quality product is the principle of DC Machinery, as we always do.

Effective Volume of Drilling Fluid Cycle Tank

The effective volume of drilling fluid cycle tank should be large enough to accommodate the maximum cyclic volume of the drilling fluid in the drilling process, and have enough reserve capacity, meanwhile the cycle tank has the abilities of participating in cycle and controlling well in case of an emergency. In recent years, with the developing of the overseas markets and the increasing demand of drilling fluid solid control systems by drilling craft, the drilling fluid cycle tank has the phenomenon of enlarging volume aimlessly.

If the cubage of solid control system is oversize, the cost of moving drill rig and drilling fluid will be increased. Therefore, reasonable cubage is the goal which pursued by users. According to the well drilling practice by many years, it uses the method of calculation of drilled well hole cubage or drilled well casing cubage to calculate the effective cubage of the drilling fluid solid control system in general. The results of the two methods of calculation are approximate.

In a set of solid control system, the size of the single tank and the amount of the cycle tank are decided by the height of the substructure, the local transportation condition, and the effective volume of the drill rig needed, etc. The top of the cycle tank should have enough space to put solid control equipments, mud agitator and drill rig transfer pump. Moreover, the settings of the associated line, mud trough, accessory, pump inhalation, remove pipeline, water pipeline and the space of other equipments should be considered. The volume of every storehouse mainly depend on the installation space of solid control equipments like shale shaker, desander, desilter, centrifuge, and other auxiliary equipments to confirm.

The Types of Shale Shaker

The skill level of shale shaker mainly reflects on handing ability (thruput and separation size ),working stability, the length of useful lifespan and operating flexibility. The handing ability of shale shaker is related to the constitution of shale shaker, motion trail, vibration frequency, vibration intensity, screen area and screen size. For matching the shale shaker with the rig, the maximum displacement of the drill pump and the drilling cuttings quantity generated in the drilling process must be considered.

In general, depends on the motion trail of screen frame, shale shaker can be group into four types: circle screen, ordinary elliptic screen, linear screen and balanced elliptic screen.

Ordinary elliptic screen: also known as disequilibrium elliptic screen. Right above the centroid of the screen case there is a fixed excitation device. It requires the screen case to tilt an angle, by using gravity, it can clean up the sand constrainedly, and avoid the tendency of retrojecting of the sand. As a result, the slant of screen case improved in the mobile function of sand assuredly, but the handing capacity of drilling fluid has been reduced by the shale shaker. This is the mainly shortcoming of the ordinary elliptic screen.

Linear screen: The two pieces of main shafts which have two eccentric blocks rotate synchronously and contraorbitally for producing linear vibration. Because the direction of linear screen vibrating is constant, the strangle particles come off difficultly, as a result ,the phenomenon which called “sieve paste” will appear, the effective open area will be reduced, and make handing capacity decreased, however when the sieve mesh number increased , the sieve paste phenomenon will be more seriously. Thus, when the linear screen uses super fine mesh, it will not content the demand of drilling fluid consumption.

Balanced elliptic screen: It’s a new screen type developed in recent years. The balanced elliptic screen combines the basic advantages of the circle screen and  linear screen. The handing capacity of balanced elliptic screen is more than the linear screen by 20-30%. It’s a more advanced drilling fluid shale shaker, and represents the current development direction of drilling fluid shale shaker.

The Constitute 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. Moreover, the job content of shale shaker will direct influence on the desander, desilter and centrifugal. Compared with swirler, centrifugal and degasser, the wasting power of shale shaker is the least, and the investment is little, as a result, shale shaker is the most economical equipment in the present solid control equipments.

The constitute of shale shaker

Buffer slot: The drilling fluid which returned to ground from shaft bottom flow into the buffer slot which is installed on the shale shaker, reducing the flow velocity of the drilling fluid, and making the drilling fluid flow into the screen evenly and slowly.

Screen case: For tensioning the screen, bracing the vibration exciter, and making the sustained vibration which comes from vibration exciter deliver to the screen, thus reaching the screening purpose.

Screen: This is the important component for cleaning up solid phase and recycling the drilling fluid, the size of solid phase particles which are eliminated by shale shaker depend on the size of sieve pore completely.

Vibration exciter: It is the power producer of the screen case vibration. The exciter brings the periodic exciting force, and makes the screen case generate persistent and periodic vibration.

Damper spring:Brace the screen case and vibration exciter. Ensure the screen case has enough vibration space, meanwhile, assist the screen case in achieving the required vibration.

Foundation: Brace the above components, easy to install and transport.

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