Repeated drill lifting refers to the operation of repeatedly lifting drill, drilling down and lifting drill at the stuck position to pass the stuck point. After determining the stuck position of the diamond bit, by controlling the lifting system of the drill, a series of irregular and frequent repeated operations such as lifting up, lowering down and slow turning are adopted. This kind of operation method can solve the general slight stuck bit, and the pulling force of lifting drill can not be too large, so as to prevent the drilling tool from being jammed and unable to drill down.
To solve the stuck drill problem by lifting drill vigorously
In the case that a slight pull tool cannot get rid of the stuck part, you can try to use a larger torque to pull the stuck tool. Before pulling, first make sure that the cable in the lifting system can withstand the tension applied. If the load is not enough, replace the thicker cable. In practice, it should also be accompanied by jack or pipe jacking machine and other external lifting equipment. This kind of method is suitable for dealing with the stuck drilling without bending the drilling hole. If the drilling hole is bent, it is easy to cause the fracture of the diamond drill tool.
The method of drilling and fishing solves the stuck drill problem
This kind of method is the most commonly used, including many operation methods, such as tap fishing, reaming fishing and through-hole fishing. The premise of using these methods is that repeated lifting and vigorous lifting cannot achieve unstuck. Because once the method of fishing is used, the diamond drilling tool in the hole is bound to be damaged, especially the reaming fishing, and sometimes the whole drilling tool including the diamond bit will be ground and crushed.
The problem of sticking is solved by reversing and casing milling
Reversing is similar to fishing with tap, but this kind of method is generally used in the drilling process of oil and gas fields, because the thickness and quality of the drill tool is much higher than geological drilling, so the taper of the tap can not meet its lifting torque. It is very important to manage and calculate the drilling tool when reversing, especially when the positive drilling tool and the reverse drilling tool are used alternately, we should be careful and meticulous. Otherwise, due to the unclear drilling tool or the wrong calculation, it may cause the error of the drilling tool and affect the handling of the accident.
