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Monthly Archives: June 2015

Why use drilling fluid during drilling working

Drilling fluids are used extendively in the upstream oil and gas industry, and are critical to ensuring a safe and productive oil or gas well.

During drilling, a large volume of drilling fluid is circulated in an open or semi-enclosed system, at elevated temperatures, with agitation, providing a singnificant potential for chemical exposure and subsequent health effects.

Drilling fluids have a continuous liquid phaseand are modified with various chemical additives, both liquid and solid, to align the performance of the drilling fluid to the drilling conditions. However, all fluid types must possess some common characteristics.

drilling fluid sytsem

Drilling fluids are key requirements in the vast majority of drilling operations. The main functions performed by drilling fluids are to:

1. Provide a barrier for well control.
2. Remove cuttings from the well bore as they are produced.
3. Maintain drill cuttings in suspension when drilling circulation is stopped.
4. Maintain formation stability and pressure on the formation.
5. Control fluid loss through filtration.
6. Cool and lubricate the drill bit and string.

Meanwhile, drilling fluid has large solid phase and chemical agent which can pollute environment and influence drilling performance, that need a unit eliminate the solid phase and chemical agent. Solid control is the specialized unit process the drilling fluid and with good working efficiency. If you want learn more about solid control system, welcome to contact us.

Process of dewatering units in drilling field

The use of “dewatering units,” as a regular part of the drilling fluid treatment process on drilling rigs, continues to increase. A dewatering unit, the final phase of a solids control program, is designed to discard no free liquid.

A solids control program in which a dewatering unit is used is referred to as a “closed-loop system” (CLS), “sumpless system,” or “chemically enhanced centrifugation” (CEC). These units can process drilling fluid from the active mud system or underflow from the solids removal equipment (shakers, desanders, desilters, and centrifuges).

dewatering unit

Chemical pH adjustments are made to the excess mud: flocculants and coagulants are added to the input stream of the dewatering unit. The flocculated solids are usually removed by a high-speed (high-gravity) centrifuge. Colloidal-rich discards typically contain approximately 50% by volume water but can have as little as 10% by volume solids and still be handled as a solid. These solids can be handled with a frontend loader and hauled on dump trucks, therefore, disposal is typically not a problem. The recovered liquid is usually treated and returned to the active mud system.

Treating chemicals, including acids, polymers, strong bases, and clarifying agents, should be carefully selected and additions carefully monitored in order to prevent personnel injury, overtreatment, and excessive treatment cost.

Screw conveyor of drilling cuttings system

Generally speaking A screw conveyor or auger conveyor is a mechanism that uses a rotating helical screw blade, to move liquid or granular materials. They are used in many bulk handling industries.

Screw conveyor for drilling cutting transfer to feed the Vertical Cutting Dryer or the HI-G Dryer Shakers. The Screw conveyor allows the drilling waste treatment company to connect the Solids Control System with the drilling waste management equipment. Screw conveyors are typically used to transport drilled cuttings from the shale shaker area to a discharge port, skip or to secondary processing equipment.

screw conveyor

DC Solid control has standard 14 inch and 18 inch diameter screw conveyor for option, also you can choose 2 section, 3 section, or 4 section ( maximum). Each Screw with electric motor and control panel.

Screw conveyor manufactured by DC Solid control with the highest safety standards, the u-shaped protection device prevents foreign matter into the slot, and the framework protects and supports conveyor, in order to improve the rigidity of whole equipment and provide a safe environment. Screw conveyor is suitable for horizontal 15 ° inclination or less than 15 ° inclination. The medium temperature is – 20 ℃~ + 80 ℃

Benefit of use vacuum degasser

ZCQ series Vacuum Degasser is a special-purpose device and a new type one for the treatment of gas in the drilling fluids. 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 degassers are used to clean the gas in the drilling fluid, to ensure the drilling fluid property relatively stable, to guarantee the steady operation of swirlers. The degassers can be grouped into two kinds: ordinary pressure type and vacuum type. The ordinary pressure degasser is to use the centrifugal to take out gas to invade the mud, with the help of centrifugal force to make the mud spraying in the jet tanks and striking on the wall to make gas releasing.

vacuum degasser

The vacuum degasser uses the suction of the centrifugal, forming negative pressure in the vacuum tanks, under the action of drilling fluid at atmospheric pressure, through the suction pipe into the hollow shaft, then by umbrella piece of around the hollow shaft assembly, they jet to the skin of tank.

Features & Benefits
•Skid-Mounted – Simplifies spotting and installation.
•Self-Contained – The unit consists of a cylindrical vacuum tank with internal baffle system, vacuum pump, jet nozzle and three-way float valve.
•Three-Way Float Valve – Unique design allows venting to the flare line during hydrogen sulfide service.
•High Performance – The D-GASSER can handle up to 1,000 gpm while restoring mud to its original density.
•Robust – The unit is ruggedly built and is coated inside and out with a corrosion-resistant epoxy to ensure long life and minimum
maintenance.

You are welcome to contact with us to get more detailed info, we will supply cost-effective vacuum degasser and satisfactory pre- sale, sale and after-sale technical services.

Sound Oil Abandons 2nd Nervesa Appraisal Well

Southern Europe and Mediterranean-focused Sound Oil has decided to abandon the second appraisal well on its Nervesa discovery in northern Italy pending a possible sidetrack at the well, the junior energy firm reported Tuesday.

Sound said that despite the confirmed presence of gas and the completion of re-perforation and stimulation operations in the lower section of the well’s target reservoir, the company had been unable to secure a stabilized flow rate. Consequently, Sound has concluded that the lower section of the target reservoir is insufficiently permeable to flow gas.

With no material gas shows in the upper section of the target reservoir, Sound has decided to abandon the well – although the firm also plans to retain the top-hole facilities at the site in anticipation of a future sidetrack.

Sound said that it will now focus on achieving first gas at the first Nervesa well while also preparing for its first well on its recently-acquired interest in Morocco.

Sound CEO James Parsons commented in a company statement that he was “disappointed” that the level of permeability encountered in the well was insufficient but that the company remains “very well positioned with a diverse and well balanced portfolio of assets in Italy and Morocco and a strong cash balance”.

Submersible slurry pump seller

A submersible slurry pump is a device which has a hermetically sealed motor closely coupled to the pump body. The whole assembly is submerged in the fluid to be pumped.

Slurry Pump is the cantilever pump structure of single stage and single suction, with the bearing housing, supporting, intermediate pipe connecting the pump hydraulic components, the water is discharged out from the drain pipe parts, pump impeller is for semi- shrouded with the agitating vane on the vane extended.

submersible pump

The submersible pumps operates in a vertical position. Although their constructional and operational features underwent a continuous evolution over the years, their basic operational principle remained the same. Produced liquids, after being subjected to great centrifugal forces caused by the high rotational speed of the impeller, lose their kinetic energy in the diffuser where a conversion of kinetic to pressure energy takes place. This is the main operational mechanism of radial and mixed flow pumps.

The pump shaft is connected to the liquid/gas separator or the protector by a mechanical coupling at the bottom of the pump. Well fluids enters the pump through an intake screen and is lifted by the pumps. Other parts include the radial bearings ( bushings ) distributed along the length of the shaft providing radial support to the pump shaft turning at a high rotational speed.

Necessity of mud gas separator in drilling site

Mud/Gas Separators are ideal for use where drilling is likely to encounter large volumes of gas. The technology is especially beneficial in sour gas environments or when drilling with an underbalanced mud column.

Function of mud gas separator

The mud/gas separator is designed to provide effective separation of the mud and gas circulated from the well by venting the gas and returning the mud to the mud pits. Small amounts of entrained gas can then be handled by a vacuum-type degasser located in the mud pits. The mud/gas separator controls gas cutting during kick situations, during drilling with significant drilled gas in the mud returns, or when trip gas is circulated up.

mud gas separator

Dangerousness if not use mud gas separator

When the drilling mud result gas invade, the proportion of its weight and viscosity have a greater deviation not to meet the requirements of drilling. The serious situation is that would cause Chung well, and even blowout accident occurred, if not to treat it timely.

Classification of mud gas separator 

Mud gas Separator combined with the Electric Ignition Device can be used to ensure the drilling process smooth. It is devided into the normal pressure Mud gas separator and pressure auto-control Mud gas separator, according to the pressure.Mud gas Separator is your best choice to prevent drilling mud invasion.

 

Vertical cutting dryer produced by DC Solid control

Vertical cutting dryer is one of the popular products for waste drilling cuttings. As the developing for the environment regulations,the drilling waste management has become more and more import.

Vertical Cuttings Dryer (also called verti-G Cutting Dryer) is a vertical type centrifuge that has been proven to be one of the most effective waste management equipment for oil- or synthetic- based drilling operations.

vertical cutting dryer

Working principle of vertical cutting dryer 

The Vertical Cuttings Dryer uses centrifugal force to dry drilled solids in oil or synthetic base fluids. A stainless steel screen bowl traps“wet” solids and accelerates them up 900RPM with G force up to 420. Liquid is forced through the screen bowl openings, while “dry” solids are extracted by the angled flights attached to the cone, which rotate slightly slower than the bowl. Tungsten carbide protects the flights from abrasive solids and ensures long operational life. This aids in maintaining a constant gap between the scroll and screen bowl, which is crucial for proper operation.

DC Solid controls Vertical Cuttings Dryer fixed with individual oil lubrication system with automatic alarm for pressure limit. The main motor and oil pump motor is interlocked with each other for avoiding the start of the main motor prior to the start of the oil pump motor.

Mechanical mud agitator supplier

Drilling fluids mud agitator is a kind of mechanical agitator, also part of the drilling fluid solids control equipment, which is mainly used to agitate and mix the drilling mud to prevent solids particles from depositing in the circulating mud tank and to stabilize the performance of drilling fluid.

In order to keep the drilling fluids even and make particles suspending, we need to fix the agitators on recycling tank. Agitating will promote the coordination of drilling mud material, such as bentonite and barite. We should keep agitator working continuously to avoid solid precipitating and keep solid suspending is helpful to separate them by Desander, Desilter, and dcanter centrifuge, etc.

mud agitators

The agitator is mounted on top of the mud tank and has one or two impellers immersed in the mud slurry. The impeller shaft is directly coupled to an electric drive motor that is available in many different horsepower ratings from 3hp (50Hz only) to 30hp (60Hz).

Each agitator is designed for the specific application, taking into account parameters such as tank size, tank depth and mud characteristics. For vertical configurations the drive motor rotates the impeller shaft through an all helical gear drive. For horizontal designs the motor is connected through a combination of helical and bevel gears. Both designs permit mounting of one or two impellers having either straight or canted blades.

Main function of vacuum degasser

Vacuum degassing is a technique of removing dissolved gas from a liquid solution by lowering the pressure inside a vessel containing the solution.

Vacuum degassing processes involve the exposure of molten steel to a low-pressure environment to remove gases (chiefly hydrogen and oxygen). The effectiveness of any vacuum degassing operation depends upon the surface area of liquid metal that is exposed to low pressure. This process is typically performed in a specially designed chamber known as a vacuum degasser.

vacuum degasser

The reduced pressure inside the vessel or chamber causes the gas to become less soluble and separate from the liquefied material. After the vacuum degassing process is complete, the gas is removed from the vessel, and the pressure is returned to normal.

Vacuum degassing to remove carbon not only reduces imperfections, but also makes metals more ductile, or easily shaped and formed through cold metalworking.

These units are positioned downstream from mud gas separators, gumbo removal equipment (if utilized), shale shakers and mud conditioners (if utilized), while hydrocyclone desander and Decanting centrifuges follow in the arrangement.

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