Drilling waste management

Drilling and Completion waste generation and classification

Drilling and completion fluids and waste management into solid two elements. when the liquid waste generated from sewerage waste drilling mud separation , wash water well field , formation outflow of water, diesel motor cooling water , improvement instrumentation and wellsite sewerage water , etc. ; solid waste , together with waste drilling mud contamination occurred when separation mud, drilling cuttings square measure contaminated with harmful drilling parcels , wellsite construction residue , contaminated soil , drilling materials and packaging.

Drilling waste management, there square measure several waste substances harmful to humans , significant metal ions , some harmful parts like chemical science , once discharged into the atmosphere round the well web site , can inevitably result in soil, surface water and groundwater pollution , impact on the atmosphere cannot be assess the injury , notably in environmentally sensitive areas , would endanger people's health and life , therefore, the drilling and completion of waste treatment is important .
 

Drilling and Completion standing waste treatment abroad

At present, foreign countries usually price the event of the industry drilling and completion technology, waste disposal , from the start of the last century , the corresponding process instrumentation and installations are within the international advanced level , just like the us , Canada, France and different countries within the drilling method of drilling completed abandoned wells on liquid waste treatment employing a four solids management instrumentation to gather cuttings and dust , so were cured of their waste or transport . usually used instrumentation shale shaker, desander , desilter , decanter centrifuge, and different rubble recovery.

Drilling fluids equipment

Rheological parameters and the physical meaning of the plastic flow patterns

① static shear strength (τs)

Start drilling fluid flow required minimum shear stress , which is a continuous measure of the strength of the space frame structure of the drilling fluid formed in the stationary unit area . Continuous space grid structure called gel structure, also known as static shear gel strength . Closely related to the static shear size and drill cuttings and drilling fluid suspension heavier material 's ability to stop the cycle . However, static shear force can not be too large, otherwise the pump difficult and sometimes choke drain formation . Adjust the drilling fluid and the dispersion of clay content , plus inorganic electrolyte membrane adjust the electrostatic repulsion and hydration repulsion between the particles of clay , plus measures to adjust the viscosity fluids like static shear stress .
 
② ultimate static shear force

Various drilling fluid system clay particles due to the irregular surface charge and hydrophilic uneven shape at rest is easy to form a network structure. The minimum static shear stress damage drilling unit volume mesh structure on the need, the drilling fluid called "extreme static shear force ."

③ dynamic shear force (τ0)

Line segment extended flow curve intersects the axis of a shear stress τ0, which is a hypothetical value , a measure of the strength of the mesh structure of the drilling fluid when drilling fluid is reflected in a laminar flow state . Factors that affect the value and size of the adjustment method is basically the same as the static shear .

④ plastic viscosity (μPV)

Bingham formula derived from that plastic viscosity plastic fluid rheology curve segment is the reciprocal of the slope , it does not change with shear force . Description is the viscosity of the system architecture to break speed equal to the speed of recovery time . It is a fluid phase between the particles in a laminar flow system the solid state , between the solid particles and the surrounding liquid phase intermolecular friction formed . Plastic viscosity of the drilling fluid solid content , shape and degree of dispersion of solid particles , the surface lubricity and viscosity of the liquid itself, and other factors . It is directly related to the drilling fluid suspension capabilities, its value should be moderate. If the viscosity is too high the plastic system , reducing the time needed , the solids  control equipment is generally used to reduce the solid phase solid phase content , increase inhibitory system, reduce the activity of the solid phase dispersion ; if urgent need to reduce the dilution water can be added . If you want to increase the viscosity of the system can be added to the plastic polymer organic polymer thickener or clay.

Brightway Centrifuge Structure

1. Structure

This decanter centrifuge consists of unit assembly of revolving half, power gear mechanism, overload unharness system, base and casing, feed tube, electrical system, etc.

Graph one shows external dimensions of the most machine while Graph five illustrates the exploded drawing of the unit.

1.1 Unit assembly of revolving half

The rotating assembly consists of such parts as bowl,  conveyor, gearbox, etc., and that is fastened horizontally on the bottom through 2 pillow blocks. The bowl may be a column - cone structure and there ar six adjustable dams with a pool depth on the large finish semi-shaft of the bowl. Inner ribs ar welded on the axis of inner columnar surface and inner conic surface. The unit of the screw conveyor is especially welded together with core pipes, accelerators, volute flight, etc. and that is placed coaxially within the bowl by the bearings on the semi-shafts of 2 finish of it. The spline housing of the large finish is connected with case by spline shaft. The screw conveyor is double-ended, left rotating, whose conveyance face is bead welded with wear-resisting laborious alloy layer.

Graph seven indicates the exploded drawing of motion components assembly.

1.2 Power transmission and overload unharness system

1.2.1 Power transmission

The main power transmission drives the bowl to rotate by motor and hydro-coupling put in on the axis of it, through belts and pulleys. the rear power transmission drives the input shaft of case to rotate by motor and machine, through reducer and therefore the machine of case and thru overload unharness.

1.2.2 Over load unharness

This machine adopts a double protection live of mechanism-electric appliance, embody hydro-coupling, mechanic overload unharness.

1.3 Base and casing

Consist of vessel assembly, base, vibration dampers, and transport frame.

1.4 Assembly of feed tube

The assembly of feed tube involves that of feed tube and improvement tube. The improvement tubes is employed for flushing the centrifuge before shuting down.

1.5 electrical system

Electric system includes management cupboard, limit switch and corresponding cables.

Brightway is the professional manufacturer in the solids control euqipment and drilling fluid system.Welcome every customer to visit our factory.

Improved the recycling of drilling fluid system

Drilling centrifugal pump in solid control system, sand pump is used for the drilling fluids Desander , in addition to mud , mud cleaners and other equipment for the material, the transmission medium is circulating with the solid phase drilling fluids . Existing drilling sand pump shaft seal using a simple mechanical seals , often resulting in the string into the drilling fluids sand pump bearings ( sealed ), of which the drilling fluid contains large amounts of solid particles . Thus making drilling centrifugal pump bearings quickly damaged , causing many to abandon drilling drilling crew and desilter desander etc. , only shale shaker , a serious deterioration in the drilling conditions . 

For drilling fluid seal problems Xi'an Brightway Energy Machinery Co., Ltd. developed a new type of sand pump seal, mechanical seal structure using the new theory, the structure of the active life than more than doubled .

 Drilling pump in the drilling solids control system is the most important hydraulic devices. However, the existing drilling pump significantly larger , emphasis , and the pump piston and cylinder wear is very serious, is the main wearing parts of the pump. The reason is mainly for two reasons : First, the structural design of drilling pump is mainly imitation , not using modern design methods , resulting in a significantly larger drilling pump structure ; Second, the solids content of the drilling fluid ones, mainly due to serious friction liner wear - especially barite drilling fluid pump piston causes.

To do this , you should use good sealing effect , long life drilling sand pump new seal structure to extend the life of sand pump , better play drilling solids control equipment performance , improve drilling efficiency. 

HDD drilling mud system

Aiming at Trenchless Directional Drilling mud purification and recycling system exists using conventional shaker run the risk of mud , grit removal and desilter not complete, mud and other small particles can not clear the problem , brightway can provide the best quality solids control equipment and system .

Using horizontal directional drilling technology for pipeline crossing construction , urban construction and municipal pipe network transformation electrification , communications and cable laying across large and small rivers, lakes, and the demolition of the building can not be the best choice is not to disfigure the state and protection of the environment the best method of construction . In recent years, the level of directional drilling technology in various countries and various sectors of the world has been widely used in China in recent years, with the rapid development of pipeline construction , especially natural gas project construction , directional drilling large diameter pipes began to , long-distance, large wall thickness across the areas of expansion , the level crossing has been greatly improved . Because of the large caliber, long-distance directional drilling developed in recent years , through the introduction of foreign rig the general majority, its ancillary equipment has not attracted much attention , especially in the mud purification and recovery system. However , as people 's awareness of environmental protection , how to conduct safety and environmental protection become directional drilling directional drilling development.


An important issue.
In trenchless directional drilling , due to the hole diameter, such as natural gas and Jining pipeline project , the use of «1 016 mm pipe, in reaming stage , a very large amount of mud . Typically , trenchless directional drilling is the open system , in general through the mud in the amount of 3 000 m3 or more, some even up to 10 000 m3 [1]. Large amount of mud , the mud will not only increase costs and land acquisition costs , more serious problem is through the completion of the waste mud Without effective treatment,

Pollution of farmland and water , will cause ecological problems. As people 's awareness of environmental protection , development and use of mud tank purification and recovery is imperative. Purification and recovery of mud slurry can be returned to solid phase processing and recycling, while reducing the amount of slurry , to reduce environmental pollution and reduce the amount of processing of waste ; the other hand, the recovered slurry are " cooked mud " , the performance is relatively stable, unstable performance can reduce the emergence of underground accidents.

Brightway Desilter

Domestic drilling mud in drilling waste management instrumentality performance level compared with foreign countries, there's still a spot, it's necessary for foreign solid management instrumentality gift state of affairs investigation and learn the technical advantage, promote our country's solids management instrumentality analysis and development of producing technology. This paper collected reception and abroad within the solid section analysis instrumentality mud desilter style, analysis, calculation and use, material and also the basis of analysis achievements, with the present within the mud desilter to some existing issues within the style a replacement form of mud desilter device theme. Connecting with the assembly apply, this paper primarily on the subsequent many aspects of the planning work: 

(1) Through the domestic and foreign mud desilter connected assortment of knowledge analysis, found the domestic and foreign desilter characteristics and development direction, combined with domestic desilter technology state of affairs and lubricator solid section management the particular state of affairs planned preliminary style.

(2) in keeping with the mud desilter of the operating mechanism and conditions of use, advises the desilter the structure and also the main structure style.

(3) Through the intensive field investigation and technical demonstration, with China's a part of the oil field, first, from the facts, supported technical practicableness, structure of advanced BWCNQ100-8N sort desilter style theme and technical parameters.

(4) mistreatment computer-assisted technology style strategies, the prevailing solid management instrumentality supported the analysis results, and do the BWCNQ100-8N desilter theme style and theoretical calculation.

(5) within the structure style and mechanics analysis and intensity, and on the idea of the vortex end of the most components of the structure style, draw the particular assembly drawings and also the necessary drawing.

Brigthway can provide you the professional solids control equipment and drilling fluids system.

Vacuum degasser

The solid control system also has some horizontal vacuum degasser equipped, its working principle is to use vacuum suction fluid, separated by the thin film after turbulent gas pumped by the vacuum pump. However, this horizontal vacuum degasser need to reprovision a pump spray unit, so that the degassed fluid pumped from the vacuum processing chamber. 

Vacuum Degasser installation

(1) Drilling site requirements as long as no obvious tilt can be.

(2) inlet and outlet pipes, vacuum pumping line connections should be sealed and reliable.

(3) before the start of inlet and outlet pipes should end while immersed in the drilling fluid.

(4) Before the start of the first inlet hose on the vacuum pump and water pipe connected, stop for 3-5 minutes, and so filled with water after the pump is started again. At the same time, turn on the gas-water separator plugs, to the gas-water separator was filled with water until the water overflows from the overflow port stop and spin on the plugs. Start should check the motor rotation direction is correct.

(5) Vacuum control valve on the adjusting screw in place has been adjusted at the factory, do not casually adjusted.

Vacuum Degasser maintenance

(1) Vacuum degasser mud tank cover should be cleaned once a week, in order to avoid clogged gas channel.

(2) After use, the rotor should be washed and vacuum tank suction pipe, cut off the power, remove as the hole blocking plate to check parts for damage, and remove foreign objects inside the tank, rinse the tank wall and the rotor.

(3) After each using, the cleaning work should be carried out to ensure the re-use deaerator with good performance.

(4) Operating ambient temperature higher than 300C, the always see vacuum gauge, when the vacuum is less than 0.3 KPa, the water temperature should be maintained within the vacuum pump does not exceed 450C.

(5) For winter using, to promptly release the gas-water separator and pump the water to prevent cracking.

(6) Every month, available to the spindle bearing grease gun filled with sodium based grease filling volume 200ml.