Horizontal and horizontal drilling techniques

Chapter I: Horizontal drilling

The plan of construction of horizontal drilling technology (HDD) and drawing HDPE pipes applies to the following jobs:

I. PRIMARY SURVEILLANCE, SOLUTION, AND CONSTRUCTION RATIO.

I.1. Collection survey, calculation solution.

The head private links with main permissions, get the table of the interface in the public;

In the face of the expected construction, the company's supervising personnel conduct an accurate verification on the horizontal drilling construction location described in the profile design, welding power source, clean water combined with drilling fluid. , safe location to gather construction waste (residual sludge), the server will handle it according to the regulations on the environment, hygiene and safety,...

Construction team, Mathematics surveying on the special ground, becoming owners (trees, houses, lines, underground cables, sewer pipes, embankments, ...), locating drilling machines, welding HDPE pipes combination, standard pipe layouts, combined equipment path construction options, materials, possible obstacles, and solutions to speed up progress.

Derived from natural conditions: face by, traffic, weather. To overcome these difficulties and speed up the progress, the horizontal drilling companies must follow the following criteria:

1. Optimize mobilization sources for every paragraph.

2. Resources are arranged for the smooth coordination between schools with school and construction tools, with the main authorities, local people, functional agencies, and the Investor to not interrupt the construction process.

3. Strictly check, find out potential risks, focus on immediate treatment to prevent potential problems from developing into problems.

I.2. Construction plan.

The construction plan is to streamline the following tasks:

1. Site conversion tool, construction of transport machines at construction sites by the server, HDPE plastic pipes transported to the site.

2. Career guidance.

3. Scientific work.

4. Connecting the machine and pulling the HDPE pipes, connecting.

5. Disconnect the device, tidy up the computer.

II. DRILLING METHODS

II.1 Drilling in horizontal orientation (pilot bore)

Guide control is based on the asymmetric mechanism of the drill attached to the drill head.

Drill with a maximum slope angle of 30%, to design depth then turn to 0%. At the changing position, bring the drill bit to an angle of no more than 30% to bring it to the destination.

Based on the blueprint, use the TriHawk drill bit to drill at a suitable inclination angle. When the drill head reaches the design direction change point, adjust the tip of the drill to a "12 clock" angle and then use the thrust to gradually change the direction of the drill to the horizontal with the predetermined depth according to the design.

Then continue the traverse using a rotating technique - pushing the drill head until the trip point is upwards. Continue to adjust the tip of the drill head to the "12 clocks" angle and use the drill head thrust to advance towards the pre-set target point. During the drilling process, the drilling fluid is pumped down to lubricate and reinforce the borehole wall.

Direction control is controlled based on the asymmetric mechanism of the drill bit mounted on the drill head.

The whole signal serving the direction of the drill head is determined by the transmitter inside the drill head, this transmitter must be continuously active during the drilling and ensure to send the signal. at least 15m away from the water surface.

This information is transmitted by the detector via radio waves to the remote display device located on the drill to help the operator orient the drill according to the design.

Directional drill bits must be strictly controlled to follow a predetermined direction by design and must strictly comply with permissible curvature.

II.2. Back reaming:

1. Drilling line expansion technique.

After the directional drilling is completed, the TriHawk drill head and the drill bit will be replaced with a reamer. Applying the rotation-pulling technique to bring the lagoon back to the drilling machine at a suitable speed with the geological strata of the tunnel passing along with a suitable amount of drilling fluid to be pumped in to create the tunnel. , for tube pull.

The break-in headworks to expand the drill line into a tunnel of sufficient size to successfully pull the pipeline (at least equal to 120% of the pipe diameter to be pulled).

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