Monthly Archives: September 2012

Shale shaker with saving energy

Shale shaker with saving energy, how to improve the drilling fluid sieve size and the amount of drilling fluid contradiction to has become the shale shaker research the problem is currently the most commonly used is several vibrating screen operates in parallel to improve the handling capacity, if they can do the shale shaker screen mesh to the 160 mesh the sieve size a = 0.0927  above,  and the vibrating screen mesh in the case of vertical completely isolated  dry matter particles sieved granules d =0.0927 / (1.1-1.13) ≈ 0.132-0.082um. Due to the impact of the drilling fluid viscosity  actual sieved granules should  200 mesh  0.074um more or smaller. After drilling fluid purification vibrating screen will be able to meet the system requirements.
Subsequent desander can disable desilter can disable or less,  both energy-efficient and can reduce the loss of barite to reduce drilling fluids wear and tear on equipment,  extend sand pump and subsequent life of the equipment,  reduce the operating cycle of the equipment maintenance. Desander and desilter by two displacement of about 200 square sand pump work,  outage of power saving, a great significance.

Introduction to slurry tanks in drilling mud system

 slurry tanks slurry tank solid control system for oil drilling . It mainly consists of the FG and ZG drilling mud oil tank1.mud tank circulatory system according to the shape of the bottom of the tank is divided into a square tank and tapered cans. Tank with tablet conical structure or the corrugated structure, assembly welding of steel plate and steel. Tank surface and corridors with non-slip steel plate and non-slip strip stencil, The tank surface railing square steel pipe production for accessibility collapsible structure firmly seated. The mud tank circulation system tank surface with clean water pipeline for cleaning the tank surface and equipment can face stencil using dip zinc processing. The ladder on the tank with insurance-linked channel to do the main  to do with non-slip strip stencil pedal bilateral guardrail. Set the standard sand, oil drilling mud tanks and anti-the awning tank set Heating insulation pipeline.As mud vector mud tank is an indispensable part of the mud circulating system, in turn, to be completed by the aggravation of mud, mixed solid-liquid separation, from the wellhead to the degassing process, mud tank carries the mud pump mud circulation solid-phase particles in the slurry tank solids control equipment progressively separated aggravated by mud mixed system for deployment to the drilling process requirements, the mud tank degassing equipment can remove harmful mud gas, electric centralized control in order to ensure the environmental requirements of the job site and mud weight slurry tank. Equipped with heating systems and insulation system the  tank in polar low temperature areas.Mud tank to adapt to domestic and foreign mountains, rivers, highways crossing project design, development, manufacture horizontal directional cross machine supporting mud mixed recovery system. To reduce the wear and tear of the mud pump, drill pipe, drill through drilling fluid mud tank recycling can greatly improve the level crossing speed drilling fluid purification savings the mud material , reduce drilling costs and protecting the environment ,slurry tank users considerable economic benefits.

Mud tank belonging to a drilling fluid purification device and its container. The mud tank by tank, tank top agitator constitutes tank into two parts separated by a partition. Characterized in that in the tank top mounted two sets of sand pump and a desander, desilter ,they are respectively mounted can slide up and down and can be fixed on the bracket, in the desander and desilter below respectively mounted a small shaker. The new structure is compact, small footprint, Desanding effect, can reduce mud losses, relocation transport vehicles less saving labor,  not easily damaged parts to extend the service life. The mud tanks suitable for purification handling and storage of slurry oil drilling. The mud tank is generally customized parameters vary. The mud tank as a solid control system essential equipment .

Use need to pay attention to the following aspects
Do not let the mud in the mud tanks precipitate attached to the tank wall reduce the capacity of the tank is not conducive to clean.

shale shaker repair and maintance

Shale shakers is an important part in mud cleaning equipment.repair and maintenance is crucial .
  • Shale shakers although without lubricating oil, every year still need an overhaul, replacing lining board,one of the two screen surface dressing etc..Vibration motor to remove the check, and to the motor bearing oil, if the bearing damage, is to replace.
  • The sieve should always take out, regularly check the screen surface is damaged or uneven, mesh is blocked.
  • suggestions for making supporting frame, with hanging standby screen surface
  • often check the seal, found the worn or defective should change in time.
  • class check sieve pressing device, such as a loose should press.
  • class check the feed box is connected is loose, if the larger gap, cause collisions, will make the equipment breakdown.
  • class check sieve body supporting device, observation of hollow rubber pad has no obvious distortion or debonding, when the rubber pad damage or transition when flattened, should also be replaced two hollow rubber pad.
  •  check the V belt tensioning force, avoid in starting or working in the slip, and ensure that the V belt wheel on the positive.

9, check all the bolt fastening degree, and in the first job after 8h, retighten once

shale shakers operation

Shale shakers operation and repair maintenance is essential, improper operation, is likely to affect the shale shaker service life, reasonable repair maintenance can extend the life of the vibration sieve.

shale shaker operating points:

  1. Operating in the working should be reading records, and equipment general check.Check the belt tensioning degree, vibrator in the oil level, check the screen surface tension, the bolt fastening and sieve breakage.
  2. Shale shaker promoter should follow the order process system.
  3. In the shale shaker work, to use visual, auditory screening vibration exciter and a screen box work.Shale shakers after stopping the application of touching the bearing cover nearby, check the bearing temperature rise.
  4. Shale shakers parking should be consistent with the order process system.Shale shakers except special requirement, forbidden band material after stopping to sieve feeding.
  5. Shale shakers shift should be put on the sieve technology status and found fault in the records.Shale shaker records shall be indicated in the parts of the injury types and the exciter, oil change date.
  6. Shale shaker is the high speed movement of equipment, vibrating screen operation operation patrol officers to maintain a safe distance, to prevent the occurrence of personal accidents.
  7. Before the start of checking whether the unloading with safety splint.
  8. Check all the locking part is solid
  9. Before starting up, the operator response to vibration sieve both sides at the same time check the oil level, the oil is too high will cause vibration temperature rise or operation difficult, oil level too low will cause premature bearing damage.

 

 

types of drilling fluid

In geotechnical engineering, drilling fluid is used to aid the drilling of boreholes into the earth. Often used while drilling oil and natural gas wells and on exploration dilling rigs, drilling fluids are also used for much simpler boreholes, such as water wells. Liquid drilling fluid is often called drilling mud. The three main categories of drilling fluids are water-based muds (which can be dispersed and non-dispersed), non-aqueous muds, usually called oil-based mud, and gaseous drilling fluid, in which a wide range of gases can be used.

Many types of drilling fluids are used on a day-to-day basis. Some wells require that different types be used at different parts in the hole, or that some types be used in combination with others. The various types of fluid generally fall into a few broad categories:

  • Air: Compressed air is pumped either down the bore hole’s annular space or down the drilling string itself.
  • Air/water: The same as above, with water added to increase viscosity, flush the hole, provide more cooling, and/or to control dust.
  • Air/polymer: A specially formulated chemical, most often referred to as a type of polymer, is added to the water & air mixture to create specific conditions. A foaming agent is a good example of a polymer.
  • Water: Water by itself is sometimes used.
  • Water-based mud (WBM): A most basic water-based mud system begins with water, then clays and other chemicals are incorporated into the water to create a homogenous blend resembling something between chocolate milk and a malt (depending on viscosity). The clay (called “shale ” in its rock form) is usually a combination of native clays that are suspended in the fluid while drilling, or specific types of clay that are processed and sold as additives for the WBM system. The most common of these is bentonite, frequently referred to in the oilfield as “gel”. Gel likely makes reference to the fact that while the fluid is being pumped, it can be very thin and free-flowing (like chocolate milk), though when pumping is stopped, the static fluid builds a “gel” structure that resists flow. When an adequate pumping force is applied to “break the gel”, flow resumes and the fluid returns to its previously free-flowing state. Many other chemicals (e.g. potassium formate) are added to a WBM system to achieve various effects, including: viscosity control, shale stability, enhance drilling rate of penetration, cooling and lubricating of equipment.
  • Oil-based mud (OBM): Oil-based mud can be a mud where the base fluid is a petroleum product such as diesel fuel. Oil-based muds are used for many reasons, some being increased lubricity, enhanced shale inhibition, and greater cleaning abilities with less viscosity. Oil-based muds also withstand greater heat without breaking down. The use of oil-based muds has special considerations. These include cost and environmental considerations.
  • Synthetic-based fluid (SBM) (Otherwise known as Low Toxicity Oil Based Mud or LTOBM): Synthetic-based fluid is a mud where the base fluid is a synthetic oil. This is most often used on offshore rigs because it has the properties of an oil-based mud, but the toxicity of the fluid fumes are much less than an oil-based fluid. This is important when men work with the fluid in an enclosed space such as an offshore drilling rig.

On a drilling rig, mud is pumped from the mud pits through the drill string where it sprays out of nozzles on the drill bit, cleaning and cooling the drill bit in the process. The mud then carries the crushed or cut rock (“cuttings”) up the annular space (“annulus”) between the drill string and the sides of the hole being drilled, up through the surfacecasing, where it emerges back at the surface. Cuttings are then filtered out with either a [shale shaker], or the newer shale conveyor technology, and the mud returns to themud pits. The mud pits let the drilled “fines” settle; the pits are also where the fluid is treated by adding chemicals and other substances.

The returning mud can contain natural gases or other flammable materials which will collect in and around the shale shaker / conveyor area or in other work areas. Because of the risk of a fire or an explosion if they ignite, special monitoring sensors and explosion -proof certified  equipment is commonly installed, and workers are advised to take safety precautions. The mud is then pumped back down the hole and further re-circulated. After testing, the mud is treated periodically in the mud pits to ensure properties which optimize and improve drilling efficiency, borehole stability, and other requirements listed below.

Tangshan Dachuan machinery equipment Co.,Ltd is the professional manufactrer of drilling fluid equipment , including Drilling mud process system , shale shaker Mud cleaner ,Hydrocyclone desilter ,Vacuum degasser , Drilling Mud decanter centrifuge , drilling mud centrifugal pump , mud mixing pump, mud agitator , poor boy degasser ,flare igniter , shearing pump ,submersible slurry pump , mud gun , mud tank , drilling mud equipment spare parts , etc . The quality goods and best service .

 

The characteristics of the mud cleaner

Mud cleaner, grit removal, in addition to the mud one cleaner drilling mud, three solid control equipment, it is the grit removal cyclone and the desilter cyclone underflow together for a vibrating screen. Drilling fluid slurry cleaner structure is compact, small footprint area, powerful drilling mud solid control, the ideal choice for efficient and clean equipment.

Drilling fluid characteristics of efficient and clean.
Drilling fluid desanding production Tangshan DaChuan Machinery Co., Ltd. In addition to mud combined mud cleaner It includes Desanding, desilter pressure pump, cyclone underflow tank, shale shaker, bracket and base. Wherein desander and desilter main intake pipe and the outlet pipe is provided between the control butterfly valve, the base has a chute, cyclone-site automatic sand blocking devices and underflow mouth adjusting device. Applies new structure is compact, easy to use, easy to maintain, reliable work, can quickly remove the harmful solid in drilling fluid, improve the performance of the drilling fluid to meet the requirements of the high-pressure jet drilling new technology.
The ZQJ series desander is the secondary processing drilling fluid solids control equipment, according to the size of the diameter of the cyclone divided into cyclone desander and swirl desilter. Generally more combination of cyclone called desander secondary drilling solids control equipment used is the 10 “and 12” cyclone, mainly used for the separation of drilling fluid in the particle size of 47-76um The solid phase particle size according to customer requirements processing amount, select group of cyclone combined into Desanding. the DC solid control cyclone desander widely used in petroleum drilling, horizontal directional drilling Desanding separation.

Oil drilling desander

We produced the drilling fluid desander, use of new overcome the shortcomings in the original Desanding workmanship, mud desander inlet tube the Flushing cone bucket and row Sand mouth constitutes row bucket of sand cone has rotary member, the cylindrical wall of the rotary member, with a separation window, rotating build the upper tube wall, a set of tapered groove and the inlet pipe through which drilling fluid rising member, by the

vacuum degasser in solids control system

ZCQ series 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. 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 vaccum 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.

DCQJ series drilling mud cleaner

DCQJ Mud Cleaner

DCQJ mud cleaner  is a normal model of our company,we can design customized cost-effective mud Cleaner for customers special needs.Our mud cleaner can meet almost all needs for oil & gas well drilling fluids treatment system and HDD Mud Recycling System.

TYPE DCQJ-XXX
Swirler Diameter(mm) 250(10″)/100(4″)
Swirler Quantity 1-3/4-20
Pressure(MPa) 0.25-0.40
Thurput(m3/h) 40-320
Low low Creen Type The screen can be changed according to the customer’s requirements.
Screen Area m2 1.0-2.2
Centrifuge Pump 15KW-75KW
Remarks 1. Thruput of swirler:4″whirl desilter =10-15m3/h, 10″whirl desander=90-120m3/h
2. The type number is decided by the type number of drip screen.

Mud Cleaner is the second class and the third class solid control equipment  which is the newest type to treat the drilling fluid. DC drilling mud cleaner are combined from Desander, Desilter and an Underflow Screen, at the same time Mud cleaner has the higher cleaning function  compared with separated desander and desilter. In addition to the reasonable design process, it equals another shale shaker . DC mud cleaner structure is compact, it occupy small space and the function is powerful. Mud cleaner is the ideal device of the second class and the third class solid control to treat the drilling mud.

A mud cleaner is a combination of desanders and/or desilters mounted over a shaker with a fine mesh screen. A mud is fed to the inlet of the hydrocyclone(desander and/or desilter) to separate particles and the underflow passes to the fine screen mesh where in particles larger than barite are discarded and thrown away. In most drilling operations, a mud cleaner is installed in its mud systems. It is usually located in a mud tank in the same location as with the desilters.

 

drilling mud shale shaker

Shale shaker is first phase solid control  equipment in drilling fluids processing system, also known as key solids control equipment in drilling mud system, shale shaker decides performance of the whole solids control system. DC Solids Control can design double shakers and triplicate shakers on single skid according to clients’special requirements and also supply relevant connecting manifold, according to current industry situation, DC provide both third generation linear motion shale shaker and fourth generation balanced elliptical shale shaker.

features & benefits

● With alloy steel material with higher strength.
● General heat treatment completely eliminate stress.
● Coating with high wearing resistance anti-erosion capability.
● The advanced screw thread loose-proof technology and metal surface treatment technology in the world are adopted.
● Imported engine with adjustable excited force id used to give the machine an outstanding comprehensive performance.(U S Martin motor)
● The low-temperature shale shaker suitable for high-cold area and ocean-type shale shaker suitable for marine environment and the shale shaker with thescrap-eliminating function for truck-mounted drilling rig also developed   

Technical Parameters

TYPE DCS585-3/4 DCS630-3 DCS700-3/4 DCS830-2/3
Shake Locus linear type or ellipse 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

Environmental conditions:
Ambient relative humidity:           No more than 95%
Degree of explosion-proof:          ExdⅡBT4
Corrosive environment:                No corrosive gas or vapor that may damage metal and insulation
Ambient temperature:                   -20℃~+40℃
Degree of electrical protection:  IP55

 

 

Classification of Mud gas separator

The mud gas separator is a speacial equipment to deal with the gas cut drilling fluid as the vacuum degasser. It belongs to ordinary pressure degassing equipments. It is the primary machine in the whole degassing system, the main difference compared with the degasser is to deal with the bubbles with diameter more than or equal to 3mm. The big bubbles mean most of the expansile gas filled in the space of the drilling well, the diameter of the bubbles is about 3-25mm.

The classification of mud gas separator

There are two types of  the commonly used mud gas separator.

1. Back cover type

The bottom of the degassing tank is sealed. The drilling fluid flows back to the circulation tank through a U pipeline. The height of drilling fluid in  the degassing tank can be controlled by the increasing or decreasing of the U pipeline’s height.

2. Open base type

The is no base on the degassing tank,  the bottom part will be put into the drilling fluid. The level inside of the tank can be controlled by the depth of the degaasing tank in the drilling mud. This kind of separator always be called “poor child” overseas to show how easy it is.

The most simple and reliable mud gas separator is the back cover type. The open base type takes the second place, because the level of the drilling fluid affected by the level inside of the circulation tank. The working pressure of the mud gas separator is equal to frictional drag when the gas piped out from the discharge tube.  It requires a certain level of the drilling fluid inside of the separator, if the frictional drag is larger than static water pressure of drilling fluid column, it will cause short circuit, the gas cut drilling mud without separation will be piped into the circulation tank directly.  The short circuit shows the shortage of separation capacity of the mud gas separator.