Tag Archives: drilling fluids

Mud Tank System

High quality oilfield mud tank system must be fabricated under professional configuration. The optimal proposal with high efficiency and low cost. Cater to clients’ specific demand and actual drilling conditions.

solids control system

All the equipments and tanks should be made of high quality raw material and produced according to executive standard. Inspect all equipment and oilfield drilling mud tank completely and strictly. Ensure all pipes are connected with each other. All welding line should be sealed and plain.
solids control systemshale shaker
Actually, we need almost fluid system include shale shaker tank, active, storage tank or mixing tank. Sometimes, there will be also the trip tank, pill tank, and swab or test tank. The mud tanks are different size or dimension. It depends on whole mud tanks system capacity or flow mud pump flow rate. Whole mud system including different phases and process steps. We need to calculate all information in detail.

The Structure of Shale Shaker 3

Different brands of shale shaker have different methods of fulfilling these demands by using specialized screen tensioning apparatus, rubber seals around the screens, basket reinforcement to limit flex, rubber Float Mounts rather than springs, rubber Deck seals and selective vibrator placement.

shale shaker
Basket Angling Mechanism- The shaker basket must be capable of changing its angle to accommodate various flow rates of drilling fluids and to maximize the use of the shaker screen bed, this is where the angling mechanism plays an important part.

shaker screen
Vibrator- This is the device which applies the vibratory force and motion type to the shaker bed.

1

A vibrator is a specialized motor built for the purpose of vibrating, While containing an electric motor to provide the rotary motion it uses a set of eccentric weights to provide an omnidirectional force. To produce the proper Linear motion a second, counter rotating, vibrator is added in parallel to the first. This is what gives us the linear motion, “high G” shaking of the basket.

The Structure of Shale Shaker 2

Feeder- The Feeder is essentially a collection pan for the drilling fluid before it is processed by the shaler shaker, it can come in many different shapes and sizes to accommodate the needs of the mud system. The most commonly used feeder is known as the weir feeder, the drilling fluid enters the feeder usually through a pipe welded to the outside wall near the bottom of the feeder tank, it fills the feeder to a predetermined point and like water flowing over a dam the mud (drilling fluid) spills over the weir and onto the screening area of the shaker.

shale shaker

This method of feeding the shaker is most widely used due to its ability to evenly distribute the mud along the entire width of the shaker allowing for maximum use of the shaker screen deck area.

 

Some feeders can be equipped with a bypass valve at the bottom of the feeder which allows the drilling fluid to bypass the shaker basket and go directly into the hopper and back into the mud system without being processed by the shaker screens.

Jet mud mixer
Screen Basket- Also known as the screen “bed” it is the most important part of the machine, it is responsible for transferring the shaking intensity of the machine, measured in “G’s”, while keeping the “shaking” motion even throughout the entire basket. It must do all that while holding the screens securely in place, eliminating drilled solids bypass to the mud hopper and allowing for easy operation and maintenance of the machine.

Mud Agitator

Brightway mud agitator is a part of solid control system and mud tank, which is mainly used in agitating and blending drilling fluid so as to control the depositions of solid particles in its tankcycling system and keep the mud property of circulation stable and mixture uniform.

mud agitator

Major features of Brightway brand agitator:

solids control system

  • The reducer adopts a cylindrical worm with an axial section of circular acre. The circular acre teeth of impeller wheel are conjugated with the worm, which provide good convexo-concave engagement, high efficiency transmission, strong agitating ability and compact structure.
  • The reducer combines with anti-explosion motor, which is suit for rough operation condition in field, and can be repaired conveniently.
  • New up-down structural agitating impeller wheels have a two-layers structure, which can be used as one-layer and dual-layer one.
  • The strong agitation, broad conformance and low starting moment of resistance are provided.
  • Level – placed motor is easy for installation, adjustment and replacement.

Definitions of Drilling Fluid Solids Control

In well drilling, we often hear various drilling fluid solids control related terms. Then, what do they mean?

1) Solid Phase Volume

The total insoluble solid drilling fluid, usually expressed as a percentage by volume. The solid phase volume of high density drilling fluid including low density and high density solid. Solid amount of conventional drilling fluid are low density solid.

 

2) Low Density Solid

These solids including clay powder and cuttings as goods. Usually in the solid control work assumes that its density is 2.60 or 2.65g/cm3, this assumption has been able to obtain satisfactory results, the actual value may fluctuate between 2.0~3.0g/cm3.

 

3) Density

Density is the volume in mass per unit. The unit can be used g/cm3. Drilling fluid is composed of different density materials. In the past, the proportion of common concept, now is no longer in use. In solids control system, solids control equipments like desander and desilter are used for adjusting the density of drilling fluid.

desander

4) Cuttings

Drilling is the main solid contamination of drilling fluid, it greatly affects the performance of drilling fluid, must be stable, and therefore can be an important problem in the process of drilling to conventional drilling fluids treatment. Solid control is the control of drill cuttings. Has the direct relationship between the drilling cost and solid control and its effect.

Drilling Mud Decanter Centrifuge

Drilling fluid decanter centrifuge used for recovery barite to remove small solid particles, reduce the mud solid content, to ensure the performance of the drilling fluid. And Brightway supply drilling fluid centrifuge has high purification efficiency, convenient adjustment and easy maintenance .

decanter centrifuge

The drilling fluid decanting centrifuge is driven by two motors. The main motor drives the drum and differential shell rotation by the belt . The vice motor drives the spiral through the differential variable speed . The drum and spiral rotate together in the same direction, but at different speeds . Separate the solid phases in the drilling fluids by the centrifugal sedimentation principle.

decanter centrifuge

Suspending fluids is pushed into the rotor drum through the inlet pipe and under the force of screw propeller, under the effect of centrifugal force, the solid phases will be pushed onto the inside wall of the drum, pass the impeller on the screw propeller and be discharged from the exhaust hole at the small side of the drum. The fluids is excreted from the overflow hole of the large end. So continuous circle like above to achieve the target of continuous solid-liquid separation .

decanter centrifuge

 

Brightway LWF Series decanter centrifuge adopts centrifugal force to separate solid particles out of drilling fluid. Different solids or particle have different density and flow speed, some decanter centrifuge also can separate particles as different size and density. Brightway LWF decanter centrifuge is widely used in oil and gas drilling,chemical,foodstuff,pharmacy,mineral beneficiation,water treatment,etc.Brightway also manufacture other solids control equipment.If you want to know more informations ,feel free to contact with us.We will do our best to serve you.

Mud Tank for Solids Control System Part 1

In petroleum & natural gas drilling, and directional drilling,  the drilling fluids are widely used with functions of providing hydrostatic pressure to downhole, controlling & maintaining the down hole pressure, keeping the drill bit cool and lubricating bit while it works, and most importantly, carrying the drilled-solids to the surface of the well. To maintain the property of the drilling fluids, the drilled solids must be removed by the solids control system which takes the mud tank as the carrier of drilling mud, and also the mud recyclying system are used to add additive agents into the fluids, and mix them thoroughly.

solids control system

Ⅰ· Summery Description

The drilling fluid, or called drilling mud, is made of many different kinds of chemical material, and can not just abandon them directly. That would be much harmful for the natural environment but also increase the drilling cost. So we have to introduce the solid control system. It separates the solids step by step through different stage of solid control equipments.

solids control system

Ⅱ· How the Drilling Fluids Circulate in the mud tank.

For the working process of the solids purification equipments, please refer to the following sketch. First the mud pump sucks up the mud that kept in the mud tank, increase the pressure, and push it into the inner hole of the drilling stem through the swivel, and the mud would spray out through the drill bit nozzle, and meanwhile carry the solids that cut by the bit out of the borehole through the annulus of borehole and drilling stem, and then through the return line, the drilling mud comes to the solids control equipment to be treated.

The composition and maintenance of mud shale shaker

Mainly by the mud shale shaker: vibrating motor, compound rubber spring, stainless steel screen, screen box and a start switch.The product through the vibration motor drives the eccentric block to rotate at high speed, the eccentric block to rotate the centrifugal force generated strong effect on elastic oscillator, which is fixed on the flat plate frame screen screen frame at the bottom of the vibration sieve to higher frequency, higher drilling cuttings.

shale shaker

Vibration sieve in the oil and gas drilling, non excavation in a very important position in engineering, coal-bed methane development, shield, river dredging, mud recycling system.

In order to enhance the service life of the shale shaker, attention should be paid to the use of notes and daily maintenance.

First, take over whether leakage logging can import inspection vibration sieve, and according to the requirements. The inlet connecting pipe. Each shift with a water hose to sediment generation equipment operation process from the device wall and sieve bed clean. These deposits will increase the damping block load and reduce the ability of vibrating screen separation of solid particles. Each shift once or inspect screen wedge fast fixed and working state. And the screen may not have holes or other defects, otherwise, the solid particles may loss. If the screen is damaged, should be replaced in a timely manner.

Second, in the use process, if found to have occurred in drilling fluid, should be timely.

shaler screen

Third, stop running vibration sieve, should be promptly shaker screen, and drilling fluid brush brush clean screen and embedded in the mesh in the sand. In the process of drilling mud shaker has stopped functioning, and because of long time no circulating drilling fluid viscosity, often up to more than 100, when the mud into screen slot through the valve is opened, and at the same time close flash board inlet end of the vibration screen, prevent the drilling fluid with high viscosity and flow to the screen surface. Screen cataplasm to death. If the board closed lax, the drilling fluid into the screen, should be promptly rinse screen.

Fourth, lifting, no foot and smashing pressure screen, the transport process is strictly prohibited any item screen. Hoisting and transportation must be 4 M20 × 110 bolts to mud shaker screen box and the base are fixed, to prevent the damage caused by the violent vibration shaker box.

The working principle of Brightway decanter centrifuge

Brightway decanter centrifuge used in solid phase concentrations of solid particle size 2-7 μ m, drilling mud is 2 ~ 40%, the drilling mud liquid relative viscosity and separation and containing a small amount of solid liquid separation of 30s suspensions. Mainly used in oil and gas drilling non excavation, shield, dredging engineering, able to complete the solid, liquid, dehydration separation process.

decanter centrifuge

BWLWF series horizontal centrifuge, by two at the same time, to the drive motor, the main motor through a belt drive, drive the drum and the differential housing operation, the auxiliary motor through a differential gear drive, the screw shaft inside the. So that the drum and spiral shaft rotation in the same direction movement; and reaches a certain speed difference. Drum diameter generally divided into 450mm and 355mm two, because the speed decided to separate the effect of the equipment, so the higher the speed, the better the separation effect. The centrifuge is divided into components, base, screw axis, conversion, the outer box body, differential, main and auxiliary motors, electric control, various connecting pipe manifold.

BWLWF series horizontal spiral centrifuge is according to the characteristics of oil and gas drilling mud solid, professional to design separation equipment. BWLWF series centrifuge is mainly used for recovering barite powder, solid particle filter tiny, reduce drilling mud solid to the content, so as to control the density of the drilling mud viscosity, in a certain range, to ensure the performance of drilling mud, do not change. To achieve a sustained effect of cycle use.

The processing ability of the hydrocyclone

Brightway desander is solid management second level system of solid management instrumentation, the most role is to solid particle filter 47~76um. Sand removing cyclone relies on the principle of centrifugal gravity to get rid of solid particles in drilling muds. lubricating substance is fed into the impact of sand removal when Cyclone For mation of swirl flow in cyclone, cyclone mud is mirrored all told directions, by centrifugal gravity made, deposition of solid particles within the vertebrae at the hydrocyclone, the bone body discharge to the vibration sieve. And was refined from the higher a part of the lubricating substance pipes into a suspension storage mud tank solid system.

desander

Besides the benefits into sand hydrocyclone is: import and export manifold with fast joints connecting (maintenance), has the benefits of easy structure, quick replacement, handling capability of sturdy moving flow. The disadvantage isn’t effectively the solid is separated into 2 size vary obvious.

Cyclone sand process capability depends on the scale of the cyclone for removing sand and dust consistence. If the hydrocyclone underflow adjusted, to cyclone for removing sand input while not consistence liquid, no consistence liquid from a suspension pipeline is discharged; and therefore the relative with solid separation, liquid input solid particles discharged from rock bottom outlet, whereas the cyclone below the excretion export adjustment is that the key.

hydrocyclone

 

If the hydrocyclone desander bottom outlet, diameter relative to the balance between zero corresponds to the diameter is just too little and therefore the balance purpose underflow mouth edge region are going to be fashioned while not liquid zone, the alleged non liquid zone is between the equilibrium points and outlet edge solely in solid sand,vertebral wall than the drier. once little gravel lose wet, are going to be terribly straightforward to adhere to the inner wall of the cyclone on the block, this is often not the wrong adjustment mode is named dry bottom. If the discharge port adjusting diameter is larger than the comparable to the equilibrium purpose diameter can result inleakage, the error adjustment that’s referred to as wet bottom