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Tag Archives: solids control system

Oil Drilling Solids Control and Separation

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Petroleum solid control system is mainly for oil drilling solids control and separation , enabling the drilling fluid recycling, also called mud purification system . Procedure applies to 2000-7000 meters of drilling wells , oil solid control system consists of 3-7 body composed of modular combinations ; purification jars conical bottom end using the new structure, the edge of the mud mixing system using easy grit ; entire circulatory system between the tank and the tank , between the warehouse and the warehouse that can be separated and can Unicom to meet the needs of drilling operations , including the bottom of the suction manifold valve is open and flexible, reliable sealing after closing . The entire circulatory system configuration 5 purification equipment, ancillary equipment in the shaker, mud cleaner Desanding addition , except for the use of air and vacuum blender , new oil drilling mud purification system , reducing emissions from the mud , with obvious environmental protection.

Solids control system for oil separation process, the drilling fluid debris , silt and other particles , to maintain circulating drilling fluid performance and storage . With increased mixing device , infusion devices and chemical filling device . For improving the physical and chemical properties of the drilling fluid to meet the needs of drilling work.

ZJ70 Drilling Rig Solids Control System for Sale

ZJ70 drilling rig solids control circulating system is designed into the configuration of five stages purification equipments, including shale shaker, vacuum degasser, desander, desilter, medium speed centrifuge, shear pump, etc, it can meet the requirements of drilling fluid circulation, mud aggravation and shearing and other accident treatment under special circumstances.

solids control system

This system is a newly designed product that based on the advantages of domestic and overseas drilling fluid circulation and purification systems and combined with the actual needs of drilling process, which uses a number of sophisticated new technologies, and at the same time taking full account of some details during the operation process, with the features of reasonable design and easy installation.

Drilling fluid purification system meets the SY / T 6276, ISO/CD14690 “oil and gas industry health, safety and environmental management system”, all AC motors and control circuits in this solids control system are comply with the requirements of explosion-proof. Technical process and devices all complies with API 13C and related standards and norms.

This system adopts integrated modulars, which is easy for assembly and disassembly, not only can satisfy the requirements of ocean and railway transportation, but also can meet the loading and unloading of crane and draging in the jobsite.

ZJ70 Drilling Rig Solids Control System

ZJ70 drilling rig solids control system produced by Dachuan solids control includes the following equipments:

1. Shale shaker 3sets;

2. Vacuum degasser 1set;

3. Desander 1set;

4. Desilter 1set;

5. Middle speed decanter centrifuge 1 set;

6. Centrifugal pump 8sets;

7. Shear pump 1set;

8. Mud agitator 20sets;

9. Mud gun 18sets;

10. Mixing hopper 4sets;

11. Screw pump 2sets;

12. Mud tank 6sets;

13. Diesel tank 1set.

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Primary purpose of shale shaker

Shale shaker is a general term for a vibrating device used to screen solids from a circulating drilling fluid.

Many configurations have been used. These include:
1 A square or rectangular screening area with drilling-fluid flow down the length.
2 Revolving, nonvibrating, cylindrical screens with longitudinal flow down the center axis.
3 Circular screens with flow from the center to the outside.

Other configurations have been tried but have not become commercial. The majority of shale shakers flow the drilling fluid over a rectangular screening surface. Larger solids are removed at the discharge end, with the smaller solids and drilling fluid passing through the screens into the active system.

Shale shaker

The primary purpose of a shale shaker is to remove as many drilled solids as possible without removing excessive amounts of drilling fluid. These dual objectives require that cuttings (or drilled solids) convey off the screen while simultaneously most of the drilling fluid is separated and removed from the cuttings. Frequently, the only stated objective of a shale shaker is to remove the maximum quantity of drilled solids. Stopping a shale shaker is the simplest way to remove the largest quantity of drilled solids. Of course, this will also remove most of the drilling fluid. When disregarding the need to conserve as much drilling fluid as possible, the ultimate objective of reducing drilling costs is defeated.

 

Decanter Centrifuges

Decanter Centrifuges are a key component in drilling mud cleaning on a Drilling Rig. To maintain drilling mud in an optimum condition results in less waste, reduced operating cost and a high efficiency of the total solids control system.

Centrifuge

Mechanical separation of solids from the mud system through the use of a decanter centrifuge is a highly-effective means of maintaining proper mud weight and viscosity. When properly used decanters enable users to maintain the mud properties within the prescribed range as per the drilling program. Typically, decanters are the last processing units in the line-up of solids control equipment.

Oilfield centrifuge

In weighted drilling fluid systems, decanters recover as much as 95% of heavy barite, which is returned to be re-used in the active system, while also removing finer, lower-gravity solids.

In dewatering systems, Decanters significantly reduce liquid discharge volumes and enhance total solids control system efficiency.

 

Solids control system for weighted drilling fluid

Solids control systemWeighted drilling fluid is an important and effective measure of control well press, control well press means control high pressure oil (gas) layer, therefore the solid control of weighted drilling fluid should be valued and strengthened. Weighted drilling fluid generally used for well drilling of hard formation, smaller hole diameter, lower drilling rate and higher solid content.

The process of weighted drilling fluid solids control system

Drilling fluid enters into shale shaker, eliminate the large size drill cuttings. Underflow of shale shaker disposed by degassing, then enters into desander for disposing, underflow of desander will be discarded, and overflow will flow back to tank. Drilling fluid disposed by desander get through drilling mud cleaner and then divided into two liquid flows: one is low density overflow, it will return to drilling fluid circulating system; another is high density underflow, it will be disposed again by one super detail shale shaker, make the barite and useful liquid return to drilling fluid circulating system and most sand will be eliminated.

Although after disposed by drilling mud cleaner, most harmful solid phase has already eliminated, but some super small cuttings or less than 2um colloid will follow with barite and flow back to system. If drilling fluid still contain lots of fine cuttings and colloid barite, user need to use centrifuge to separate. The centrifuge working at least two cycle is very necessary, then the overflow of the centrifuge abandoned, bottom flow recovery of barite flow back to the drilling fluid system.

 

 

Mud tanks for drilling mud recycling system

Drilling mud tank is the main part in solids control system, according to tank bottom shape, mud tank can be divided into square tank and tapered tank. Tank body use flat conical structure or corrugated structure, steel plate and shape steel installed and welded. Tank surface and corridor adopt antiskid steel plate and antiskid bar halftone, tank surface rail use square steel tube, is the barrier-free folding structure, plug firm.

Mud tanks

Mud tank circulation system tank surface equipped with water pipeline to cleaning tank surface and equipments. Tank surface plate use leaching zinc processing. Oilfield drilling mud tank equipped with standard sand control, rainproof shed, in tank equipped with heating insulation pipeline.

As a carrier of mud, mud tank is indispensable part in mud system, it can complete mud weighting, mixed, solid-liquid separation, degassing and other technology in turn.

Mud tanks

Drilling mud tanks use the solids control equipments which on mud tanks to separate solid phase particles in drilling fluid, and achieve requirement of mud drilling technology by mud weighting, mixing system. Degassing device can eliminate the harmful gas in drilling fluid.

Commonly, tanks are customized-made according to the detail situation of the worksite or the system requirements. The dimensions differ from one system to another.

 

Drilling mud gun for solids control system

Mud GunAt home and abroad all adopt rectangle structure drilling fluid circulating tank at present, because of the moving performance is good. On the tank, there are many mud agitators for stirring drilling mud, but still have some dead angles. For solving the problem, at abroad, people install the low-pressure hydraulic mixing lines with a nozzle in tank, and the domestic use the mud gun which is installed on the tank roof to stir the dead angle.

Research shows that the effective depth of mud gun is only 1.5~2.7m, the size is related with drilling fluid density, viscosity and nozzle speed. In using process, we should pay attention to mud gun nozzle cleaning, prevent mud nozzle blockage, and pay attention to mud gun valve adjustment, according to the density of the mud to adjust the valve size.

In drilling fluid solids control system, only use drilling mud gun is not enough for stirring, we also need mud agitator, but for the dead angle of mud tank, it is indispensable equipment.

 

The Use of Shale Shakers

Shale shakerDrilling 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.

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.

When choosing shale shaker, except for according to the solid phase particle size distribution to choose suitable screen, still should consider another important factor: Screen permissive treating capacity. The treating capacity of shale shaker should be adapted to the maximum delivery capacity in drilling process.

 

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 Shakers in Solids Control System

Shale ShakerThe first line of defense for a properly designed solids control system is the shaker. Shale Shakers remove solids from drilling fluid as the mud passes over the surface of a vibrating screen. Particles smaller than the openings in the screen pass through the holes of the screen along with the liquid phase of the mud.

Particles too large to pass through the screen are thereby separated from the mud for disposal. Without proper screening of the drilling fluid during this initial removal step, downstream equipment will experience reduced efficiency and effectiveness. The downstream hydrocyclones and/or centrifuges (if employed) will simply be overloaded beyond their design capacity.

There are a number of commercial claims that indicate that shakers can achieve solid cuts lower than 74 microns, however, when it comes to the practical installation and use of solids control systems (i.e. relative to flow rates, drilling fluid viscosity, screen condition, volume of solids being managed, etc.) operators should conservatively assume 100 microns as the performance limit.

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