News information
Rock core
As is known to all, the six quality indexes of geological drilling engineering are: the taking and finishing of rock cores, borehole bending, correction hole depth, simple hydrological observation, original report and sealing hole. Among these six quality indexes, the core of rock ore is ranked first, which shows its important position in drilling engineering.
The basic requirements of rock core.
1. Rock core adoption rate.
The ratio of the core length of rock ore to the actual feed rate is the ratio of the core length of rock ore. For rock core requirements: the core is not less than 65%, the core is not less than 75%, if insufficient, should be made up.
2. Integrity
The primary structure and the original grade of the rock core are required to be extracted so that the ore type can be divided and the original structure and symbiosis of the mineral are observed. Try to avoid artificial fragmentation, inversion and disturbance.
3. Purity.
It is required that the core of the rock should not be etched, polluted and infiltrated, so as not to affect the grade, grade and physical properties of the ore. If the coal core is mixed with clay, the ash content of the sample will be increased.
4. Avoid selective wear.
The selective wear and tear of the core will change the inner material composition, causing the mineral to be depleted and enriched, and distort the original grade and grade.
5. Accurate core location.
In order to obtain accurate burial depth, thickness and yield of rock ore, the mineral reserves and geological structure are calculated accurately.
2. Factors affecting the rate and quality of rock core.
1. Natural factors
The natural factors affecting the quantity and quality of coring are the physical and mechanical properties of the rock and the structure and structure of the rock strata. When drilling hard, dense and homogeneous rock strata with high rate, the core is not afraid of washing and vibration, and it is easy to get the intact rock core which can maintain the original structure. Drilling loose, broken, joint development, sex differences and soft interlayer rock seam, out of the rock cores into more, lump, flake, not only the native structure is destroyed, and adopt low rate, they couldn't even get the heart.
2. Human factors
2.1 selection of drilling method is unreasonable.
When the steel is drilled, the vibration is large, the pore wall is large, the rock ore core is drilled, and the abrasion of the rock core is the most. Slight wear of hard alloy drilling; Diamond drilling is minimal.
2.2 improper selection of drilling tool structure.
Role in drilling bending or eccentric core tube, pipe, or bit, drilling tool in the rotary motion, centrifugal force and horizontal vibration of the blunt An, wear and damage to core. In addition, if the appropriate coring tool can be selected according to the properties of the rock and rock strata, it is possible to obtain the rock ore core with high rate and good supply and sales table.
2.3 improper drilling procedures.
(1) excessive pressure will aggravate the bending and vibration of the hole bottom drilling tool, causing the rock ore heart to be severely damaged by machinery; The pressure is not enough, and it extends the time of the rock core's damage in the core tube.
(2) the rotating speed is too high, the vibration amplitude of the drilling tool increases, and the damage to the rock core is intensified; The low speed and low drilling speed prolong the damage time of rock core.
(3) the amount of the pump washing liquid is too large, and the scouring force is large, which aggravates the damage of the rock ore core being destroyed and abrasion. The unreasonable circulation mode can also cause the rock core to be damaged and repeated wear.
2.4 incorrect operation method.
The blind pursuit of footage in drilling, the return time is too long, and the delay in lifting the drill will increase the possibility of the rock core being destroyed at the bottom of the hole. It is easy to cause the rock core to fall off due to the improper operation of the drilling tool or the method of adopting the core. When the heart is out of the heart, it is too hard for the rock core to be broken and upturned, which affects the integrity of the core and the layers of the core.
The basic requirements of rock core.
1. Rock core adoption rate.
The ratio of the core length of rock ore to the actual feed rate is the ratio of the core length of rock ore. For rock core requirements: the core is not less than 65%, the core is not less than 75%, if insufficient, should be made up.
2. Integrity
The primary structure and the original grade of the rock core are required to be extracted so that the ore type can be divided and the original structure and symbiosis of the mineral are observed. Try to avoid artificial fragmentation, inversion and disturbance.
3. Purity.
It is required that the core of the rock should not be etched, polluted and infiltrated, so as not to affect the grade, grade and physical properties of the ore. If the coal core is mixed with clay, the ash content of the sample will be increased.
4. Avoid selective wear.
The selective wear and tear of the core will change the inner material composition, causing the mineral to be depleted and enriched, and distort the original grade and grade.
5. Accurate core location.
In order to obtain accurate burial depth, thickness and yield of rock ore, the mineral reserves and geological structure are calculated accurately.
2. Factors affecting the rate and quality of rock core.
1. Natural factors
The natural factors affecting the quantity and quality of coring are the physical and mechanical properties of the rock and the structure and structure of the rock strata. When drilling hard, dense and homogeneous rock strata with high rate, the core is not afraid of washing and vibration, and it is easy to get the intact rock core which can maintain the original structure. Drilling loose, broken, joint development, sex differences and soft interlayer rock seam, out of the rock cores into more, lump, flake, not only the native structure is destroyed, and adopt low rate, they couldn't even get the heart.
2. Human factors
2.1 selection of drilling method is unreasonable.
When the steel is drilled, the vibration is large, the pore wall is large, the rock ore core is drilled, and the abrasion of the rock core is the most. Slight wear of hard alloy drilling; Diamond drilling is minimal.
2.2 improper selection of drilling tool structure.
Role in drilling bending or eccentric core tube, pipe, or bit, drilling tool in the rotary motion, centrifugal force and horizontal vibration of the blunt An, wear and damage to core. In addition, if the appropriate coring tool can be selected according to the properties of the rock and rock strata, it is possible to obtain the rock ore core with high rate and good supply and sales table.
2.3 improper drilling procedures.
(1) excessive pressure will aggravate the bending and vibration of the hole bottom drilling tool, causing the rock ore heart to be severely damaged by machinery; The pressure is not enough, and it extends the time of the rock core's damage in the core tube.
(2) the rotating speed is too high, the vibration amplitude of the drilling tool increases, and the damage to the rock core is intensified; The low speed and low drilling speed prolong the damage time of rock core.
(3) the amount of the pump washing liquid is too large, and the scouring force is large, which aggravates the damage of the rock ore core being destroyed and abrasion. The unreasonable circulation mode can also cause the rock core to be damaged and repeated wear.
2.4 incorrect operation method.
The blind pursuit of footage in drilling, the return time is too long, and the delay in lifting the drill will increase the possibility of the rock core being destroyed at the bottom of the hole. It is easy to cause the rock core to fall off due to the improper operation of the drilling tool or the method of adopting the core. When the heart is out of the heart, it is too hard for the rock core to be broken and upturned, which affects the integrity of the core and the layers of the core.
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