DWRPIS - Division for Water Resources Planning and Investigation for the South of Vietnam

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1. HYDROGEOLOGICAL EXPLORATION DRILLING

Hydrogeological exploration drilling aims at hydrogeological study by soil sampling for lithological studying and making a borehole for logging and test pumping.

Hydorgeological exploration drilling can carried out by using of drilling rigs such as YPБ-3AM-500, YPБ-2,5A...The DWRPIS has capacity for drilling exploration wells with core to depth of 500m.

Exploration drilling rig YPБ-3AM-500 at the site

2. PRODUCTION DRILLING

Beside traditional direct circulation drilling method, at present DWRPIS mainly uses reverse circulation drilling method for production drilling. This drilling technique is suitable for drilling of high capacity water supply wells, abstracting water from soft sedimentary aquifer as in Nam bo area. Reverse circulation drilling method is now widely applied in developed countries because of its many advantages in comparison with the traditional method, such as:

- It can drill a big diameter borehole.

- The porosity and permeability of the formation near the borehole is relatively undisturbed compared to other methods.

- The borehole is straight and align and easily pump installation.

- Increase the well efficiency.

Reverse circulation drilling can carried out by using drilling rigs as DRILLCON, 1БA-15B and improved YPБ-3AM-500 (done by DWRPIS). These drilling rigs can drill borehole with diameter of 800mm and depth of 500m.

Diagram of RD method

Drilling rig DRILLCON at Vietnam Brewery Factory

The improved RD drilling rig at the site in Bac Lieu

3. ENGINEERING GEOLOGICAL DRILLING

Engineering geological drilling is carried out by XY-100, XY-1A, YГБ-50M drilling rigs. They can drill borehole with depth of 100 – 150m.

Máy khoan YГБ-50M

Máy khoan XY-100

EG drilling on river