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Trenchless construction is a horizontal drilling project used in construction or infrastructure projects.

Trenchless construction is a horizontal drilling project used in construction or infrastructure projects. In the process of trenchless construction, drilling mud is needed to ensure the performance of trenchless drill. To make drilling mud reusable and to reduce drilling costs, contractors often use mud recovery systems to recover drilling mud.

KOSUN has decades of experience in the design and manufacture of mud recovery systems, especially in trenchless projects with a variety of compact mud systems available to customers. According to users’ different requirements and site area limits, KOSUN can provide mud recovery devices with different configurations to meet the requirements of different working conditions. There are usually two types of mud purification systems for trenchless construction: one is the desander swirl purification system and the other is the self-supporting mud recovery system.

Sand removal swirling purification system covers a small area and is economical. The system is a combination of a cyclone and a shaker, which are mounted on a small collection tank. The desander swirl system is a two-stage separation device, whose function is to remove coarse particles in drilling mud. The desander swirl system is mainly used in engineering that can accept large diameter solid drilling mud, such as piling.

The mud recovery system independently developed by KOSUN can be divided into four separation systems: coarse cuttings separation, sand separation, mud separation and ultrafine solid separation. The higher mud recovery system has a larger mud tank with more room to store purified drilling mud and more crown space for more separation and purification equipment. When the tank surface space is enough, the customer can also choose a centrifuge to reduce the ultra-fine solid phase in the drilling mud, to avoid the enrichment of ultra-fine solid phase in the drilling mud.

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The elevated diesel tank is installed with explosion-proof floating-ball level switch.

The elevated diesel tank is installed with explosion-proof floating-ball level switch; KOSUN 40+5m³ elevated diesel tank is the special-purpose oil tank to provide and store diesel for power machines (diesel engine, generator, etc.) of drilling crew. therefore the centrifugal oil pump can deliver the oil in oil storage tank to elevated oil tank automatically. In case of low oil level, the explosion-proof level switch opens, the oil pump starts automatically and oil transportation begins; in case of high oil level, the explosion-proof level switch closes, the oil pump closes automatically, and oil transportation ends. In order to prevent failure of explosion-proof level switch, the equipment is especially installed with oil return pipe. In such a way, the oil will not overflow from the tank even under failure of level switch.

When elevated oil tank is lifted up, the oil pressure rises. The oil in tank will be transported to equipment requiring diesel at drilling site from three channels through filter and flowmeter, and it can also flow back to the oil storage tank. The oil consumed by equipment can be read out from pointer of flowmeter.

After the elevated diesel tank is installed, check to ensure that all valves are in corresponding states. Park the refueling truck beside the oil tank, connect the outlet opening with oil feeding buffer tank or inlet opening before opening it and choose to start the 50CYZ-20 centrifugal oil pump; pay attention to the rotation direction of the oil pump. After opening or closing corresponding ball valves, and starting the oil pump, the oil flows into oil storage tank through filter, flowmeter, pipeline, ball valve and centrifugal oil pump. With liquid surface rising, the column of magnetic reversible level meter display changes from white to red. The junction of white and red colors indicates the liquid level of oil storage tank.

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Produced in the process of oil and gas exploration and development, drilling fluid waste amount is large.

Produced in the process of oil and gas exploration and development, drilling fluid waste amount is large, due to containing various products at the same time, the concentration of pollutant composition complex, high, high chromaticity, chemical oxygen demand (cod), the traditional approach is difficult to adapt to the new environmental protection requirements, an urgent need to accelerate drilling waste management efficient treatment and new technology, new technology and new equipment development, application, change the traditional waste drilling fluid end management ideas, set up the drilling pollution “wellsite closed loop” process control and new concept of clean production and complete the engineering application, Realize the new drilling clean production mode of “well standardization, green source, process reduction, end resource and equipment integration”.

Based on this, we look forward to the next trend: first, we should strengthen the exploration and field application of environmental protection drilling fluid, develop intelligent environmental protection drilling fluid technology, and reduce the difficulty and cost of end treatment and disposal of drilling fluid waste by greening the source. Ii. Improve the selective removal technology of micro and poor quality solid phase in drilling fluid, upgrade the treatment device, formulate the group’s unified drilling cleaner production standards, well site design standards and performance standards of recycled drilling fluid, and maximize the recovery and utilization of waste drilling fluid and waste water through process reduction. Iii. Establish the technical specifications for the classification, classification, temporary storage, treatment and disposal of drilling fluid wastes. According to different well depths, different drilling fluid systems and different lithologies, adopt corresponding treatment and comprehensive utilization technologies respectively, and realize the transformation of drilling fluid wastes into treasure through end-resource recovery. Iv. For drilling fluid wastes with different physical properties and different pollutant contents, different modular treatment units are selected to realize the modularization and standardization of drilling fluid waste treatment equipment through the integration of equipment.

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KOSUN SP series shear pump is a centrifugal pump designed for quick configuration of drilling mud.

KOSUN SP series shear pump is a centrifugal pump designed for quick configuration of drilling mud.

SP series shear pump can effectively mix and fully hydrate the added materials in the drilling fluid, save the use of mud materials, shorten the mud configuration time, provide good mud performance for the drilling process, is an ideal drilling fluid solid control equipment. The degree of dispersion and hydration of bentonite particles in water depends on: electrolyte content, time, temperature, number and concentration of surface replaceable cations in water. Other things being equal, SP series shear pumps can save bentonite by more than 30%.

SP series shear pumps allow the polymer to be diluted and hydrated as soon as possible. The high molecular weight of the polymer used in the mud is high, and it is not easy to hydrate directly, so the polymer needs to be pre-cut. The shear pump provides high shear efficiency and speeds up the dilution and hydration of the polymer, thus improving the quality and efficiency of the mud distribution.

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Final disposal and utilization of sludgeⅠ

After sludge is treated and disposed by a series of methods, there are generally the following final disposal methods for the dried sludge:

1. Sanitary landfill

Sanitary landfill is a traditional and mature sludge disposal method with low investment requirements and good effect, and can also increase part of urban construction land. As for the dry sludge, it is generally selected to be buried together with the municipal daily household garbage through solid waste landfill, or special sludge landfill can be set up for it. However, the current sludge treatment technology is not very perfect, some harmful substances in the sludge may not be removed clean, after landfill may have a certain potential threat to the surrounding environment.

2. Incineration

Incineration is the most thorough way of disposal. Because sludge contains a lot of organic matter and fibrous lignin, it generates a lot of heat after incineration, and the residue is less, and does not need sterilizing treatment. The energy generated during incineration can be used to generate electricity, and the ashes after incineration can be used to make cement, etc. Incineration of sludge is a very effective way to dispose of sludge.

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Oil sludge modulation in China — the status of mechanical separation technology.

Although many advanced technologies in foreign countries have been successful, but because of the conditions in all aspects of our country are greatly limited, so that these efficient technologies cannot be fully applied in our country. Our country can only draw lessons from its essence, innovate the sludge treatment technology which is suitable for our country present situation.

Oil sludge modulation in China — the status of mechanical separation technology

In the domestic refinery oily sludge modulation system, commonly used flocculants include polymer inorganic flocculants such as polyaluminium chloride, polyferric sulfate and polymer organic flocculants such as high degree of polymerization of non-ion, cation, anionic polyacrylamide and other long chain macromolecules. Most units use cationic organic flocculant or organic flocculant combined with lime before mechanical dehydration to improve the flocculation and dehydration effect. The pre-treatment of sludge in refineries in China generally adopts mechanical dewatering process, mainly with belt filter press and centrifuge. The moisture content of dehydrated sludge is 75%~80%. According to the results of various experiments, the sludge modulation-mechanical dewatering process has developed quite well among the various treatment processes for oily sludge.

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The desander cleaner is used in the solid phase control system of drilling fluid.

The desander cleaner is used in the solid phase control system of drilling fluid. It is a combination of cyclone desander and vibrating screen.

Desanding cleaner designed according to the principle of particle sedimentation, the drilling fluid separation medium through sand pump produce certain pressure and velocity, along the spiral into the cyclone wall, coarser particles under the action of centrifugal force and gravity walls along the hydrocyclone vortex sink, from the
underflow port , falls below breakdown vibrating screen separation, has risen in a spiral along the hydrocyclone, the rest of the media from the overflow mouth into the third grade separation equipment desilter further purification treatment.

Installation and debugging of desander cleaner:

The desander cleaner is m+ainly composed of a vibrating screen, a shunt manifold and a cyclone. The inlet pipe and overflow pipe of the desander cleaner are symmetrical at both ends to facilitate installation. Connect the slurry outlet of the sand pump with the inlet pipe of the desilter cleaner, and drain the overflow pipe of the desilter to another drilling fluid tank.

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KOSUN MA series mud aitator

KOSUN MA series mud aitator belongs to the equipment of tank type drilling fluid solid control system, it is mainly used for drilling fluid mixing, prevent the drilling fluid solid phase particle deposition in the tank circulation system, make the circulating drilling fluid performance is stable, mixing, mixer by explosion-proof motor, reducer, frame and wave wheel of four most. The motor and the reducer, the reducer and the wave wheel shaft are connected by a rigid coupling, and the wave wheel is welded by four blade groups.

Installation and maintenance of mud agitator:

1. When installing the mud agitator, lift the agitator horizontally and place it in the desired position smoothly;

2. Mud agitator rigid coupling must be equipped with spring pad and should be solid and reliable;

3. During the operation of mud mixer, there should be no difference in sound, cassette and high temperature;

4. The oil level of the mud agitator reducer should be kept in the middle of the oil window, and the oil should be replenished frequently when working.

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Features and advantages of KOSUN’s vertical cuttings dryer.

In oil and gas drilling, water based mud is used in shallow Wells and oil based mud is used in deep Wells. Conventional solid control equipment can effectively recover heavy metal and useful drilling fluid items. If these solid phase parts containing heavy metals and compounds are discharged randomly without treatment, long-term precipitation will cause great harm to the surrounding vegetation, soil, groundwater and other natural environment and human survival environment.

With the constant improvement of the environmental protection requirement, puts forward higher requirements on drilling field cuttings nursing, the emergence of drilling waste purification system, not only can very good to solve the environmental problems, at the same time to the waste of the solid control system to produce secondary recycling, can maximize the retention of mud is useful at the same time, to focus again after processing of drilling cuttings curing processing, reduce on-site damage to the surrounding environment.

Features and advantages of KOSUN’s vertical cuttings dryer:

1. Self-suction device, which does not need centrifugal pump to supply drilling mud;

2. Eliminate corrosion and reduce the cost of repair and maintenance;

3. Compact design and small space;

4. Deaerator can also be used as a high-power mud mixer;

5. Excellent performance, low noise, flexible and reliable braking;

6. With large capacity, low energy consumption and perfect shockproof, timing, automatic and safety control system.

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The drilling fluid cleaner is a combined mud cleaner with a desander and desilter.

The drilling fluid cleaner is a combined mud cleaner with a desander and desilter, including a hydrocyclone desander, desilter, pressure pump, cyclone, bottom flow tank, drilling fluid vibrating screen, bracket and base. The mud cleaner is compact in structure, small in space area and powerful in function. It is an ideal choice for drilling mud to control the solid phase of two or three levels.

Xi ‘an KOSUN adopts the most advanced drilling fluid cleaner manufacturing process at home and abroad, to ensure the production of powerful, compact structure, easy to operate, easy to maintain the drilling fluid cleaner.

1. The main structure of the drilling fluid cleaner is arranged in the upper and lower parts. The cyclone desander and mud remover are arranged on the upper part.

2. There is a control butterfly valve between the main inlet and outlet pipes of the desander and desilter, which can adjust the number of work of the desander and desilter at any time, and the operation is simple and easy to maintain;

3. Wear resistant special polyurethane material is selected for the cyclone, which has the advantages of good corrosion resistance and highly healthy fluid flushing;

4. Feed mouth tangent feed, smooth transition, conducive to improve the separation efficiency, the inner surface is smooth, reasonable flow channel;

5. The hydrocyclone desander and desilter are equipped with automatic sand control and blocking device and bottom flow port adjusting device; 6. Different Numbers of desander cyclone and desilter cyclone can be configured according to user requirements.