Down hole drilling tools classification

Down hole drilling tools classification: drill is a major and essential part of the drill string, its main role is to transfer torque delivery during drilling mud and constantly connected to the drill string in order to achieve longer continue to raise deep eyes purpose. Drill collars located in the drill bit and drill hole assembly or worsen between the drill pipe, drill main role is to provide control WOB and inclination,drill collars are generally made by high alloy steel forging.

Hole opener drilling

Hole opener drilling include: kelly, drill pipe, heavy weight drill pipe, drill collars, adapters, drill stabilizer, downhole drilling, shock absorbers, drill and so on. And these downhole tool string connected together to form a tube called the drill string. The drill string is ground and underground communication hub. Drilling, power transmission and conveying surface drilling, relying drillstring to achieve; complex situations change formations, underground, can be reflected through the drill string to the ground; in addition to other jobs in the drilling process, such as coring processing downhole accident, midway test and so must rely on the drill string to achieve.

OCTG tubing is mainly used to transport oil, gas well drilling and oil and gas

OCTG tubing is mainly used to transport oil, gas well drilling and oil and gas. It includes oil drill pipe, casing, tubing pumping. Oil Drill Pipe used to connect the drill collar and drill bit and drilling power transfer. Oil casing is mainly used to support the rear of the wall during drilling and completion, and after completion to ensure the normal operation of the entire drilling process wells. The main pipeline pumping oil at the bottom of the oil and gas transport to the surface.
                   

Tubing coupling is an oil drilling tool

Tubing coupling is an oil drilling tool, mainly for tubing connections. Pipe couplings mainly to solve the existing coupling due to fatigue fracture prone to stress concentration problems.
Tubing coupling structures are: tubing ends and the inner wall of the coupling connected to the tapered threads, ends with the tubing coupling body with the same thread pitch flat with threaded connect. Relieving single tapered threaded pipe connection male thread root stress concentration features, easy to produce fatigue fracture, good connection effect. Effectively prevent the oil well tubing string broken off accident.
Coupling into tubing coupling and casing couplings. Commonly used steel grade J55, K55, N80, L80, P110 and so on.

Opening device on the market a wide AISI 4142 Sucker rod variety of species, hole different substrates, sharp teeth the effective cutting is very different, prices vary. At the time of purchase opening, generally we need to consider several factors, and try to find a balance between price and performance, while providing the best cost advantage, quality assurance process and productivity of parts.
(1) consider the number of holes to be machined
A common misconception is: carbide hole saw is always the best choice for the matrix material. High-performance carbide drill drilling can provide the highest rate and the shortest processing cycle. However, if the small number of machined hole, and the workpiece material is thin, low hardness, can be relatively inexpensive bimetal hole may be more cost advantages.
(2) Consider aperture size
Carbide drill bit diameter greater AISI 4145H Hole opener than 12mm expensive, but encountered stiff material, bimetal hole saw is not durable, how to do? Optional carbide hole saw, carbide hole saw, sharp teeth welded alloy made with good abrasion resistance temperature resistance.

During the construction of the system, hole opener drilling buried crossing point and allow the excavation site exploration holes, in order to ensure that no damage to other pipelines.
     2, the selection and preparation of drilling mud
     Drilling mud is an important part of the selection and preparation of horizontal directional crossing, is to drill pilot holes pre-reaming and pullback pipe when the "blood."
     The main effect of 2.1 for cooling drilling mud hole, carry the drill cuttings and discharge the ground,
     Stabilizing the cell walls and reduce torque Hydraulic Drilling jars and pull back when drilling.
     2.2 The performance parameters of density, viscosity and bond strength, control the density prevents hole wall collapse, and the size of the drilling mud viscosity decided takeaway chip capacity, bond strength is a measure of drilling mud solid particles in suspension Ability. Only when these three parameters adjusted to an appropriate range, drilling mud to play the biggest role.

Reaming Construction Technology
(1) Dual Drilling coordinate operations hole opener drilling in and out of the soil point, each with a bench
Machines, one to provide torque, providing a pulling force to avoid long drill
Reamer cause loss of control, reducing the risk of reaming construction of mention
High speed reaming.
(2) high hardness rock reaming the pilot hole after construction is completed in the first
The first was high hard reaming, application engineered hard rock section of 370 m
Reaming process of rock in the rock section with palm-style closely spaced cones reaming
Implement multiple pre-reaming.
(3) The change is completed to drill reaming Rocks, exit the rock expand
Hole device, the reaming drill rock excavated from the point when pulled, on a subsequent drilling
Replace the drill direction lever, CLAY segment reaming.
(4) Multiple reaming reaming construction, mud flowback carry long distance
With sediment, the flow resistance is large, the effect is clear holes or wash hole is not ideal,
The effective size of the hole caused by roller reamer drilling a relative decrease in the underground ring. Using multiple expansion
Hole cutter each cutting down the soil with respect to circulation of cuttings
The mud, the desired reduction in emissions back, so it does not make
Into the hole blockage, the effective size of the annular space has been fully guaranteed.
Concrete construction, in paragraph rock and clay in a total of seven times reaming,
Effectively reduces the resistance of the reamer and shorten the reaming cycle.