Vertical wellbore construction operation mode and its selection

The vertical wellbore construction method can be divided into excavation, masonry and single-row operation, parallel excavation and excavation work, excavation and masonry mixing operations, and excavation, masonry and safety.

1. Digging and arranging single-line operations: long-single-line operations and short-segment single-line operations.

Second, the parallel operation of excavation and building: long parallel operation and short parallel operation.

Third, excavation, building mixed operation

Fourth, excavation, building, and safety

V. Selection of construction methods for vertical shafts

When the vertical wellbore construction operation mode is selected, it should be comprehensively analyzed and considered:

1. The nature of the wellbore passing through the rock formation and the amount of water inflow;

2. Wellbore diameter and depth (basic part);

3. Possible construction techniques and technical equipment conditions;

4. The operational skill level and construction management level of the construction team.

A higher average well-forming speed is achieved and there should be significant economic benefits.

The biggest advantage of single-row operation is that the process is single, the equipment is simple, and the management is convenient. When the water inflow of the wellbore is less than 40m ³ /h, any engineering geological conditions can be used. Especially when the depth of the wellbore is less than 400m, the construction management technology is weak, and the drilling equipment is insufficient. Regardless of the diameter of the wellbore, the single-row operation should be considered first.

In addition to the above advantages, the short-segment single-row operation eliminates the temporary support and should first consider the construction method.

The parallel operation of the excavation is carried out in a limited wellbore space, and the upper and lower three-dimensional intersections are simultaneously excavated. When the depth of the bedrock passing through the wellbore is greater than 400m, the net diameter of the wellbore is greater than 6m, the surrounding rock is stable, and the water inflow in the wellbore is less than 20m ³ /h. When the construction equipment and construction technology are strong, parallel operations can be used.

Digging and building parallel operations are mainly used for deep well projects with large diameters.

Mixed operation is based on a short section of driving and lining jobs on a single line evolved, increasing the height of the template, using the integral retractable metal template, so that during the time of concreting work can be part of the gangue.

Polycarbonate solid sheet

Good light transmisson :60-92%