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Published on: 2019-05-30
The drilling efficiency of a small rotary drilling rig refers to the ratio of the total depth of the pile hole drilled to the total time spent in normal operation. Factors that affect the drilling efficiency of small rotary drilling rigs include: hole depth, hole diameter, formation conditions, drilling tool selection and drill rod type, etc.
Small rotary drilling rig
The impact of hole depth on the drilling efficiency of rotary drilling rigs
When the drill bit is loaded with soil during operation, the drill must be lifted to unload the soil, and then the drill tool is lowered to the bottom of the hole. The smaller the hole depth, the higher the frequency. When any parameter remains unchanged, the larger the H, the smaller the V. When the hole depth exceeds 100m, the drilling efficiency drops sharply. When the hole depth exceeds 120m, the drilling frequency will be lower than the efficiency of other methods, and the accident rate will increase significantly. Therefore, it is suggested that when advancing the construction of ultra-deep holes, another stroke such as forward and reverse cycles must be selected.
The influence of soil unloading factors on drilling frequency
Due to the composition, structure, water content and other factors of the drilled stratum, the viscosity of the drilled cuttings is different. When the drilled cuttings backfill bucket is unloaded from the ground, the greater its viscosity, the longer it takes to unload the soil.
The influence of drilling tools on the frequency of drilling rig entry and exit
The drill bits used in small rotary drilling rigs are of various types and structures. For different equipment models, different construction lengths and different strata, different drill bits should be selected. At present, the commonly used drill bits for rotary drilling rigs are the following 6 categories: spiral drill bits, rotary drilling buckets, barrel core drill bits, bottom expansion drill bits, impact drill bits and impact grab cone drill bits, and there are different categories in each category. The effect of drilling tools has a great influence on the drilling frequency of rotary drilling rigs. The most suitable drill bit should be selected based on the stratum to maximize the drilling efficiency.
The influence of drill rod selection on drilling efficiency
The drill rods commonly used in rotary drilling rigs are divided into two categories: friction type and machine lock type. The friction type drill rod generates drilling pressure by the friction between the key strips of the drill rod. Its characteristics are: pressurization during drilling, no need to find the pressurization point, unlocking when lifting the drill rod, convenient operation, high speed of lifting and lowering the drill bit, but small pressure, and high efficiency of using this type of drill rod in drilling in softer formations; the machine lock type drill rod passes through the pressurization point between each layer of the drill rod, and after connecting, the pressure of the power head is transmitted to the bottom of the hole drill bit. Its characteristics are: the maximum drilling pressure can only be generated after the pressurization points between each layer are connected during drilling, and it needs to be unlocked before lifting the drill rod, and the speed of lifting and lowering the drill bit is slow, which is suitable for harder formations.
