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Monthly Archives: April 2014

DCSB Series centrifugal pump manufacturer

DCSB series centrifugal pump is the ideal equipment to provide impetus for Desander 、Desilter and Jet Mud Mixer. It can also be used as Charge Pump auxiliary perfusion for mud pump and Trip Pump for drilling well head.

centrifugal pump

Structure of centrifugal pump

As we know, drilling mud centrifugal pump is processing drilling fluid with various solid particle and chemical. The Centrifugal pump is a centrifugal volute pump with  single stage, end suction and cantilever design .And the casing is sustained  with centerline, and with axial suction and radial discharge.Fluid enters the pump through the eye of the impeller which rotates at high speed. The fluid is accelerated radially outward from the pump chasing. A vacuum is created at the impellers eye that continuously draws more fluid into the pump.

Why centrifugal pump called solid control

Moreover, the centrifugal pump used on pumping drilling mud to related equipments. It is an obbligato equipment to feed materials for desander, desilter,centrifuge or others. There will be also customers require screw pump for decanter centrifuge drilling fluids feeding instead of common centrifugal pump.


Features of DCSB Centrifugal pump

1. Adopt international advanced level of high wear – resistant hard alloy mechanical seal , has a long service life . And auxiliary seal use packing seal , to prevent accidents .
2. Imported bearing ensure the centrifugal pump running time is long and stable running .
3. Bearing used lubricating oil and lubricating grease two lubricating ways , the service life is greatly lengthened .
4. Use more thick pump shell , passage shape is more reasonable , the turbulence is reduced to the minimum than conventional .
5. Pump body with open structure , installation , repair and maintenance more convenient .
6. Impeller 、flow components adopt high wear resistant cast iron , guarantee the abrasion , corrosion resistance , life is improves by 50% .

DC production of centrifugal pump is professional for oil field drilling fluid new supporting pump. The impeller is specially designed to have a wider flow pass and smooth vanes , with larger flow area and smooth fluid pass , making the pump efficiency and energy saving , 10 % higher than similar products .

US drilling rig count holds steady at 1,831

The US drilling rig count was unchanged from a week ago at 1,831 rigs working during the shortened holiday week that ended Apr. 17, Baker Hughes Inc. reported.

Rigs drilling on land were up 6 units to 1,765. That gain was offset by a 5-unit loss in rigs drilling in inland waters to 14 and a 1-unit reduction in offshore rigs
to 52.

Gas rigs increased 6 units to 316 while rigs considered unclassified tallied 1 unit to reach a total of 5. Those additions were offset by a 7-unit decline in oil rigs
to 1,510.

Drilling rig

Rigs doing horizontal drilling and directional drilling were both unchanged from a week ago at respective counts of 1,224 and 216.

In Canada, a 13-unit drop in its rig count to 199 was comprised of an 8-unit fall in oil rigs to 85 and a 5-unit decrease in gas rigs to 114. Canada has 73 more rigs compared with its total from this week a year ago.

Pennsylvania took the largest gain of the major oil- and gas-producing states, adding 5 units to reach a total of 59. Louisiana and Ohio were each up 2 units to 110 and 36, respectively. Kansas and Arkansas each increased 1 unit to 28 and 12, respectively. Unchanged from a week ago were Texas at 884, North Dakota at 178, Colorado at 62, Wyoming at 49, and Utah at 27. California and Alaska each were down a unit to respective totals of 40 and 9. New Mexico declined 2 units to 89. West Virginia relinquished 3 units to 23. Oklahoma lost 5 units to 187.

Activity in the major US basins was headlined by a 4-unit rise in the Permian to 540 and a 9-unit drop in the Cana Woodford to 22.


Features of DCJQB Series Shear Pumps

shear pump

The DCJQB series shear pump offers an economical and compact method of shearing polymers into the fluid stream. When properly sheared, polymers can pass through the shaker screen without having to use larger screen sizes that could cause the loss of excess drilling mud. Shearing is accomplished with the addition of our proprietary stuffing box and shear impeller to the standard DCJQB shear pump. There are no modifications to existing piping required and the DCJQB shear pump is constructed of the same materials as the original DCSB centrifugal pump series. To improve the use of your solids control expenditures use the DCJQB Shear pump to add polymers to your solids system.

Common applications include:

  1. Polymer Additives
  2. Particle Degradation

Typical configurations:

  1. 6×5-14
  2. 8×6-14

How to Select a Centrifugal Pump Motor

centrifugal pumps

The selection of a centrifugal pump motor depends on the surrounding conditions of the pump application.The two general classifications of centrifugal pump motors are “open” and “totally enclosed.”

An open motor has ventilating openings which permit air to pass directly over the motor windings for cooling. This is not recommended where high moisture is present. A totally enclosed motor is designed for cooling by heat radiation from the outside of the motor without free air passage over the windings. It is recommended for high moisture, but not hazardous locations. For hazardous locations, a totally enclosed motor designed to be explosion-proof must be installed.

Open Drip-Proof – An open motor in which all ventilating openings are constructed so that drops of liquid of solid particles falling on the motor at any angle from 0 to 15 degrees from vertical cannot enter the machine. This is the most common motor type and it is designed for use in non-hazardous, relatively clean, industrial areas.

Totally Enclosed, Fan-Cooled – An enclosed motor equipped for external cooling by means of a fan integral with the motor, but external to the enclosed parts. TEFC motors are designed for use in extremely wet, dirty, or dusty areas.

Explosion-Proof, Dust-Ignition Proof – An enclosed motor whose enclosure is designed to withstand an explosion of a specified dust, gas, or vapor which may occur within the motor and to prevent the ignition of this dust, gas, or vapor surrounding the motor. A motor manufacturer should be consulted regarding the various classes and groups of explosion-proof motors available and the application of each.

Conduit box located on the opposite side when F-2, W-1, W-5, W-7, or C-1 mounting is specified. Standard double shaft supplied only when specified. If mounting clearance details are required consult factory.

Maximum permissible shaft runout when measured at end of standard shaft extensions is .002 T.I.R. up to and including 1.625 diameter and .003 T.I.R. 1.625 to 5 inch diameter.

Development of Chinese Made Mud Agitators

Mud Agitators

The beginning of the eighties of China, part of the mud agitators used in solids control system are imported from foreign companies. In the late eighties, began to make copies of the imported agitators, the main problem of this period are: poor reliability, bad mixing effect, large power consumption, the impeller blades are easy to break, can’t work in long-term and continuously, serious oil leakage, oil leakage is almost a common problem for this kind of agitator. Its impeller forms are mostly single impeller and disk type impeller, liquid in the tank can’t form a good convection, solid particle suspension is not sufficient.

After the past few years’ effort, mud agitators made in China have developed from imitating and mapping to creat new structures independently. Long term problems have been solved in some new structure mud agitators.

Types of Mud Gas Separators

Mud Gas Separators

Three types of mud gas separators commonly are used today: closed bottom, open bottom, and float type. The principle of mud/gas separation within each type of vessel is identical. Differences can be found in the method of maintaining the mud leg, as discussed below.

The closed-bottom separator, as the name implies, is closed at the vessel bottom with the mud return line directed back to the mud tanks, as shown in Fig. 1. Mud leg is maintained in the separator by installation of an inverted U-shaped bend in the mud return line. Fluid level can be adjusted by increasing/decreasing the length of the U-shaped bend.

Commonly called the poor boy, the open-bottom mud/gas separator is typically mounted on a mud tank or trip tank with the bottom of the separator body submerged in the mud, as shown in Fig. 2. The fluid level (mud leg) in the separator is controlled by adjusting the fluid level in the mud tank or by moving the separator up or down within the tank. Mud-tank height can restrict the maximum mud leg obtainable for open-bottom mud gas separators.

Fluid level (mud leg) is maintained in a float-type mud/gas separator by a float/valve configuration, as shown in Fig. 3. The float opens and closes a valve on the mud return line to maintain the mud-leg level. Valves can be operated by a manual linkage system connected from the float to the valve, or the valve can be air-operated with rig air. Mud-leg height can be controlled by adjusting the float assembly.

There are some inherent problems in the use of float-type mud gas separators. The manual linkage separator has experienced problems with linkage failure resulting in improper opening or closing of the mud-return-line valve. Air-operated valves fail to function if rig air is lost, resulting in no control of fluid level within the separator. Mud-return-line valves are prone to plug with solids, preventing mud flowback to the mud pits.

Because of these problems, float-type mud gas separators are not recommended and a closed-bottom separator is preferred. Open-bottom separators are acceptable; however, one should be aware that they are restricted to a maximum mud leg, somewhat lower than the mud-tank height. Although float-type mud gas separators are strongly discouraged, these separators can be modified easily for disconnection of the float, removal of the valve, and installation of a mud leg in the mud return line.

Features and Applications of Screw Pumps

Screw Pumps

Due to the stable performance of single screw pump, it usually used as the feeding pump of a decanter centrifuge in mud cleaning system.
Compared with piston pumps, centrifugal pumps, vane pumps, gear pumps, screw pumps have the following advantages:

  1. Can transport high solids content medium;
  2. Uniform flow and stable pressure, better at low speed;
  3. The rotation speed is proportional to the flow, which has a good variable adjustability;
  4. A multi-purpose pump can transport different viscosity media; installation position of the pump can be tilted;
  5. Suitable for handling sensitive and vulnerable to centrifugal force and other items; Small size, light weight, low noise, simple structure and easy maintenance.

screw pumps

Applications of Screw Pumps
Single screw pump can be widely used in the following industrial sectors, transports all kinds of media.

  1. Chemical industry: acid, alkali, salt solution, a variety of viscous, pasty emulsion chemical grout.
  2. Exploration and mining: a variety of drilling mud, mining water, floating and floating first liquid slurry.
  3. Shipbuilding: bilge water, waste oil, a variety of fresh fuel.
  4. Ceramic Industry: clay, glazes.
  5. Energy industry: all kinds of fuel, oil and coal slurry, coal slime and nuclear waste.
  6. Sewage treatment: sewage, waste oil, sludge.

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.

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