Jiama Copper Polymetallic Ore, Tibet

Release time:

2024-10-18

2020 Shandong Geological Team 3

Geological Design

Design depth3000m, final hole diameter ≤ 95mm, core diameter ≤ 60mm

Overview of final hole

Construction from June 2019 to October 2020, with a depth of 3003.33m and an aperture of 98mm; core diameter of 63mm, with an adoption rate of 99.38 per cent;

vertex angle12.1 °, azimuth 252.2 °

Equipment

drilling platform,HXY-8VB type frequency conversion hand-automatic integrated drilling rig

Formation information

0-650m corner rock is the main, 650-1100m skarn, skarn marble is the main, 1100m deep to two long granite porphyry is the main,

High rock drillability

Construction characteristics

1. The mining roadway in the work area is vertical and horizontal, and the drilling track is strictly controlled to avoid drilling into the mine roadway.

2. The upper part of the formation is broken, with strong water sensitivity, many pores and cracks, easy to leak, and high deep ground stress.

Drilling process scheme

 

Process technology point

open

Opening:φ220 single tube core to 6.50m,

φ240 rib bit reaming

φ220 diamond bit 0240 rib

Bit reaming

1, throw yellow mud ball to plug the leakage protection hole

2. Drilling deflection control technology: small drill pressure drilling; Eccentric

Bit, deviation correction drilling tool and eccentric deviation correction drilling tool shall be low.

WOB, high speed

3, large annular space gap, improve the ability to carry coarse particles of rock debris,

Reduce the mud circulation pressure and reduce the risk of sticking in the broken formation.

4. Drilling process of "drilling and expanding integration", BHA:

0150/122 coring bit 0150 reamer rope coring

Drilling tool0114 of 0127 transition drill pipe with 0146 thin wall drill collar

Rod coring. Ensure drilling accuracy and save reaming

Link, large annular space gap, large particle rock powder discharge smoothly

Orifice tube: depth approx.6.5m

φ219 sleeve boot

Second opening

Drilling in:φ175 single pipe drilling 57.49m

φ175 single-tube diamond bit

Technical casing: depth approx.57.49m

φ168 sleeve boot

Three open

Drilling in:φ150 /122 "Integrated Drilling and Expansion"

rope drilling224.50m

φ150/122 "Drilling and Expansion Integration" Gold

rigid stone drill bitφ122 drilling tool

Technical casing: depth approx.224.5m

φ140 sleeve φ140 pipe shoe

Four open

Drilling in:φ122 diamond rope drilling

1075.22m

φ122 drill pipe φ122 drilling tool

Technical casing: depth approx.1075m

φ114 drill pipe drill pipe boots

Five open

Drilling in:φ98 rope drilling to the final hole

φ95 drilling tool φ98 bit
                                                                  

Drilling structure diagram of five-opening design φ122/150 "drilling and expanding integrated" drill bit

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