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Pile foundation engineering construction method to improve the bearing capacity of soft soil pile driving engineering method. The effect of pile is to transfer the load of the upper structure to the deep soil layer on bearing capacity is bigger, also can adopt the method of compaction or squeeze real soft soil, increase the bearing capacity of the soil, so as to ensure the stability of the building, reduce the settlement. (One station foundation drilling .)

Pile foundation can be divided into two types: end bearing pile and friction pile.

The former refers to the pile through the soft soil and reach the rock or hard soil;

The latter refers to the pile hanging in the soil and bearing the weight by using the friction between the pile and the soil

The characteristics of

Pile foundation construction workload is large, generally a project to the construction of dozens to hundreds of piles, and often need to be completed in a short time, pile into more procedures, need to cooperate with more work.

Most of the construction sites are very limited, or even very small, while the site has more equipment and facilities, more materials and frequent movement of pore-forming and perfusion equipment.

When drilling holes with washing fluid, the site is not easy to dry and level, and the amount of slag discharge is large.

Because of the great fluidity of pile foundation construction, temporary erected lines are mostly used in the site, and municipal power supply is introduced as power and lighting.

The outdoor operation of pile foundation construction is greatly affected by the natural conditions, and the construction conditions are different from one project to another.

Rotary drilling rigs with GREAT Roller bit core barrel achieve high efficient works. If you drilling hard formation, GREAT made Core barrel with roller bit.

Geothermal drilling characteristics of geothermal drilling the main oil and gas well drilling technology for reference, because the heat reservoir rock geological conditions, such as lithology, buried depth and output fluid property is different, compared with more demanding conditions of oil and gas drilling, geothermal drilling, but also for geothermal well characteristic of the high temperature and large diameter to new technology and new equipment improvement and development.

Compared with oil and gas drilling, geothermal drilling has the following characteristics:

High temperature, great variation in buried depth.

The rock is hard, abrasive and high in-situ stress heat storage rocks are mostly volcanic and metamorphic rocks. Compared with the yi deposition rock of oil and gas wells, the rock is hard, abrasive and high in-situ stress, and the stratum is broken and often unstable.

The crack height is developed, and even centimeter-grade cracks exist.

Formation pressure is low and leakage is serious.

The formation often contains corrosive fluid, which is corrosive to drilling string, casing, etc.

This requires the production of expensive titanium alloy bushing and the development of special cement.

The geothermal well has a large diameter, many casing procedures and a large amount of cementing.

Drilling geothermal well is similar to drilling oil, gas and well, in order to overcome the special difficulties in drilling, drilling methods, flushing media, drilling tools, casing head structure, wellhead device and other appropriate technical measures should be adopted.

The drill pipe and drill collar with high-temperature resistance, corrosion resistance, low coefficient of thermal expansion and high strength should be used in the drill pipe and drill collar.

And we will recommend high-quality PDC bit and Tricone bit.

Well Drilling Bits

Well drilling is an engineering of rational exploitation and utilization of water resources in strata by using drilling equipment and technology.

Groundwater, on the other hand, is water that exists in cracks in the earth's crust or in gaps in the soil.

The various states of water buried below the surface are collectively referred to as groundwater.

The influence of water cut characteristics of different structures on well yield is as follows:

Clean sand and gravel sedimentary rock is the best source of water.

This kind of structure has strong water absorption, high water content and good water permeability.

Mixed layer of sand and gravel.

The sand and gravel mixture is also a water-yielding structure.

Because of the different proportions of sand, it is a secondary water-producing rock.

The lower the sand content, the higher the water yield.

Clay structure.

Although the clay structure holds water well, it is difficult for water to move through it.

This means that the clay structure does not flood the well so it is not an aquifer.

The sandstone.

It refers to the terrigenous clastic rocks whose grain size is 0.0625 ~2 mm and the sand accounts for more than 50% of all clastic particles.

If the clay ACTS as a cement in sandstone to hold the sand together it is a poor water-yielding rock.

Limestone.

It is an excellent source of water in all sedimentary rocks.

Limestone usually has large openings such as underground karst caves that contain high water content but poor water quality.

Basalt.

The earlier beds are dense rather than good water-yielding because they are tightly packed together.

If it's late it has spongy development it's a good source of water.

Of hard rock.

Such rocks as granite, porphyry, and other crystalline rocks are usually poor water producers.

The worst water-yielding beds are metamorphic rocks such as gneiss schist, quartzite, SLATE and soapstone.

In order to avoid the low efficiency of well drilling, the oil standard Tricone bit specification should be selected in the design of drilling diameter.

The selection of leading hole standard cone bit must be beneficial to the processing of reaming assembly cone bit in order to reduce the processing cost of bit.

The effect of drilling parameters on drilling efficiency is weight on bit.

The weight of bit should be determined according to the formation's hardness and softness. Meanwhile, the quality of bit, well bore, drilling tool, displacement, and performance of flushing fluid, equipment and power should also be considered.

Proper use of Tricone bit: select Tricone bit type to suit lithology requirements as much as possible, match bit size with drilling design, and use in order of size

In the process of using the bit, if the phenomenon of rampage occurs, the reasons should be analyzed immediately to check whether the formation changes or the borehole wall collapses.

The parameters should be analyzed and adjusted immediately. If the up-lift bit can't be drilled normally, the up-lift bit should be checked.

Analyze and judge the working condition of the well drilling head   in the hole.

In addition, measures should be taken to control well deviation, reduce the clearance between drilling tools and drilling holes, and play the role of full hole drilling and rigid anti-deviation.

In order to prevent deviation, centralizer and drill collar can be added on the top of the tricone bit.

GREAT water drill bit suppliers can recommend the right type according to your drilling demand. We provide water well drill bits for sale,welcome to buy our product.

Tunnel Drill Bit

GREAT can customized bigger diameter Hole openers for tunneling , such as subway , gas pipeline construction.

Characteristics of tunnel engineering:

The whole project is buried underground, so engineering geology and hydrogeology conditions play an important and even decisive role in the success or failure of the tunnel construction.

Should not only be detailed geological survey and exploration in exploration stage, as accurately as possible to grasp the tunnel project within the scope of the rock properties, the strength of rock mass, complete degree, ground stress field, the stable ability, the condition of groundwater state, the harmful gas and geothermal data, and according to these raw materials, preliminary selected appropriate construction methods, determine the corresponding construction measures and form a complete set of construction machinery.

Moreover, due to the complexity of geological conditions and the limitations of exploration methods, it is still inevitable that unexpected conditions occur during construction.

Therefore, in the construction of the long tunnel, it is necessary to take some technical measures such as test guide pit (such as qinghan tunnel in Japan), horizontal advance drilling, acoustic detection and lead guide pit, so as to further investigate the geological conditions in front of the excavation and timely grasp the changes.

In order to modify the construction method and technical measures as soon as possible.

The highway tunnel is a building with a flat shape. Under normal circumstances, there are only two working faces, namely, the inlet and the outlet, compared with the bridge and line engineering.

The construction speed of the tunnel is slow and the construction period is long.

Therefore, best drill bit for granite rock is necessary to excavate additional auxiliary works such as vertical shaft, inclined shaft and horizontal hole to increase working face and speed up tunnel construction.

In addition, the tunnel section is small, the worksite is long and narrow, some construction procedures can only work in sequence, and some procedures can be along with the tunnel longitudinal development, parallel operation.

Therefore, the construction requirements to strengthen management, reasonable organization, avoid mutual interference.

The equipment inside the hole and the pipeline layout should be carefully considered and properly arranged.

Tunnel construction machinery shall be compact and durable.

The underground construction environment is poor, and may even worsen it during the construction, such as the harmful gas generated by blasting.

Effective measures must be taken to improve, such as artificial ventilation, lighting, dustproof, muffling sound, sound insulation, drainage, so that the construction site in accordance with health conditions, and have enough illumination, in order to ensure the health of construction personnel, improve labor productivity.

Most highway tunnels pass through mountains, so construction sites are generally located in remote mountains and narrow valleys, often far away from existing traffic lines, inconvenient transportation, and difficult supply. These are also one of the issues that should be considered when planning tunnel projects.

Highway tunnel is buried in the ground, once built, it is difficult to change, so in addition to careful planning and design in advance, the construction should be done without any future problems.

Of course, the tunnel project also has many advantages. For example, the construction can not be affected by the change of day and night, the change of seasons, the change of climate and other natural conditions.

Choosing GREAT made Hole opener for your high quality and safety works.

The Purpose of drilling: drilling is an important link and means of exploration and development of petroleum and natural gas resources.

In petroleum geological work, the main purpose of drilling is to obtain the underground material data, that is, to obtain the core, ore core, cuttings, liquid, gas and other physical samples from drilling;

As a geophysical logging channel, it can obtain various geophysical data of underground rock and mineral layers.

As an artificial channel, it can observe the underground geological conditions and the underground fluid dynamics.

Using wellbore to exploit underground oil, natural gas, groundwater, geothermal resources.

The oilfield bits    technique used in drilling boreholes for oil and gas exploration and development.

It mainly includes well design, selection of drill bit and mud, combination of drilling tools, coordination of drilling parameters, deviation control, mud treatment, coring, accident prevention, and treatment, etc.

The characteristics of oil drilling technology are a deep hole, high pressure, high temperature, and many influencing factors.

According to the geological and geographical conditions and engineering needs of oil and gas exploration and development, there are two types of vertical Wells and directional Wells. The latter can be divided into general directional Wells, horizontal Wells, and cluster Wells.

The types of bits include PDC bit and Tricone bit.

The PDC bit is also used in the most common petroleum drilling, which has high efficiency and stable effect.

The oil drill bit manufacturers    provide oilfield drill bits for sale ,welcome to buy our products.

The world's major natural gas extraction countries are the United States, Russia, Turkmenistan, Iran, Qatar, Algeria, the Netherlands and so on. China has also started producing shale gas in recent years. One of the main use of the most do is the PDC bit(gas drill bits).

Popular size and type 6 1/8" GS1306T, 8 1/2" GSD1606T, 12 1/4" GS1606TM, 17 1/2" GS1905S.

Natural gas, like oil, is buried in closed geological formations, some in the same layer as oil, some in isolation.

Natural gas stored in the same zone as crude oil will be extracted along with it.

Due to the complicated geological conditions of natural gas deep well drilling, the unforeseeable engineering geological problems lead to the difference between actual drilling and design and lead to serious drilling complications and accidents, which not only endanger drilling safety and the realization of geological objectives, but also seriously restrict the improvement of drilling speed and significantly increase drilling costs.

Drill bit types oil and gas:

Gas main engineering geology problems of deep well drilling (abnormal formation pressure, sidewall instability, formation natural deflecting and reservoir damage, etc.) and its characteristics, prevention, and treatment mainly drilling engineering geological problems.

In the design and construction of drilling well-drilling engineering geological problem analysis and follow-up evaluation, especially to deal with the four pressure (formation pressure and collapse pressure, leakage pressure and drilling fluid column pressure), is to improve the design quality, achieve the fundamental guarantee of safe drilling smoothly.

Mining Drill Bits

The production system of Mining Industry is a complex system composed of many links.

In blast hole drill bits and coal mining drill bits   , complicated geological and hydrologic conditions, thick alluvium of topsoil, many quicksand layers, large water inflow, large well diameter, deep wellbore, and often concentrated operation scale, as well as high temperature, high pressure and high formation stress in the deep well, will greatly aggravate the severity of underground complexity and the difficulty of treatment.

Some problems should be solved according to the characteristics of coal mine drilling:

The problem of increasing drilling speed

Prevention and treatment of well collapse, diameter reduction, drilling drop and other accidents.

Anti-deviation technology.

High temperature resistance。

Problems of cutting tools in deep well construction.

Therefore, it is necessary to perfect the structure of the large-diameter bit.With the increase of drilling fluid density and well depth, the fluid column pressure exerts a pressure holding effect on the broken cuttings at the bottom of the well, and the broken cuttings from the cone bit are not easy to leave the bottom of the well under the action of differential pressure, resulting in the formation of a cushion at the bottom of the well, reducing the crushing efficiency, etc. Reasonable bit structure will speed up the flow of cuttings in the bottom hole, improve the crushing efficiency, accelerate the drilling speed and shorten the drilling cycle.

As well as improving the life of the roller bit, the service life of the roller has a great impact on the construction cost of drilling well. The life of the roller bit mainly depends on the life of seal, bearing and parent.

GREAT Mining tricone bit is utilized for blasting hole open pit mining. Depending on the different formations of customers, mining drill bit manufacturers can offer different product and types of drill bits used in mining,the sizes ranged from 6 3/4" to 16".

Mining tricone bit, we recommend 532、632、642、722 etc.

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